CN113814004A - Continuous reforming normal-pressure regeneration system and control method thereof - Google Patents
Continuous reforming normal-pressure regeneration system and control method thereof Download PDFInfo
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- CN113814004A CN113814004A CN202010565453.4A CN202010565453A CN113814004A CN 113814004 A CN113814004 A CN 113814004A CN 202010565453 A CN202010565453 A CN 202010565453A CN 113814004 A CN113814004 A CN 113814004A
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- 238000000034 method Methods 0.000 title claims abstract description 99
- 230000008929 regeneration Effects 0.000 title claims abstract description 18
- 238000011069 regeneration method Methods 0.000 title claims abstract description 18
- 238000002407 reforming Methods 0.000 title claims abstract description 15
- 239000003054 catalyst Substances 0.000 claims abstract description 37
- 239000001257 hydrogen Substances 0.000 claims abstract description 26
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 26
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000000926 separation method Methods 0.000 claims abstract description 4
- 238000010926 purge Methods 0.000 claims description 67
- 238000001514 detection method Methods 0.000 claims description 60
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 48
- 239000000463 material Substances 0.000 claims description 38
- 238000010438 heat treatment Methods 0.000 claims description 33
- 238000002485 combustion reaction Methods 0.000 claims description 32
- 229910052757 nitrogen Inorganic materials 0.000 claims description 24
- 230000002159 abnormal effect Effects 0.000 claims description 15
- 238000002360 preparation method Methods 0.000 claims description 14
- 102220512410 Replication protein A 32 kDa subunit_S29A_mutation Human genes 0.000 claims description 12
- 102220580056 Serrate RNA effector molecule homolog_S36A_mutation Human genes 0.000 claims description 12
- 238000011049 filling Methods 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 9
- 102200017208 rs1555451582 Human genes 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 7
- 102220003317 rs137852699 Human genes 0.000 claims description 7
- 102220514276 Replication protein A 32 kDa subunit_T36A_mutation Human genes 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims 2
- 238000013024 troubleshooting Methods 0.000 abstract 1
- 208000028659 discharge Diseases 0.000 description 19
- 238000007599 discharging Methods 0.000 description 17
- 239000000428 dust Substances 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/04—Gas or vapour treating; Treating by using liquids vaporisable upon contacting spent catalyst
- B01J38/10—Gas or vapour treating; Treating by using liquids vaporisable upon contacting spent catalyst using elemental hydrogen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/02—Heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/04—Gas or vapour treating; Treating by using liquids vaporisable upon contacting spent catalyst
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Thermal Sciences (AREA)
- Fuel Cell (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
本发明涉及催化剂重整再生领域，具体涉及一种连续重整常压再生系统及其控制方法，包括一号闭锁料斗LH‑1以及二号闭锁料斗LH‑2，所述一号闭锁料斗LH‑1中，反应器还原区LS‑3502、第一缓冲料斗FA‑351、第一收集料斗FA‑352、第一提升器FA‑353依次连通；所述第一提升器FA‑353始终与二号闭锁料斗LH‑2的分离料斗FA‑354连通，所述第一提升器FA‑353始终与氢气源连接；所述二号闭锁料斗LH‑2中再生器DC‑351，第二缓冲料斗FA‑356，第二收集料斗FA‑357，第二提升器FA‑358依次连通。所述一号闭锁料斗LH‑1和二号闭锁料斗LH‑2分别通过相关步骤进行控制。本发明有效地提高了装置自控水平，降低了人员操作强度，操作平稳性提高，提高了自动化控制水平，增设了阀门故障报警功能，提高了人员快速处理能力，缩短了故障检修时间。
The invention relates to the field of catalyst reforming and regeneration, in particular to a continuous reforming atmospheric regeneration system and a control method thereof, comprising a No. 1 locking hopper LH-1 and a No. 2 locking hopper LH-2, the No. 1 locking hopper LH-2 In 1, the reactor reduction zone LS-3502, the first buffer hopper FA-351, the first collection hopper FA-352, and the first lifter FA-353 are communicated in sequence; the first lifter FA-353 is always connected to the second The separation hopper FA-354 of the locking hopper LH-2 is connected, and the first lifter FA-353 is always connected to the hydrogen source; the regenerator DC-351 in the second locking hopper LH-2, the second buffer hopper FA- 356, the second collection hopper FA-357, and the second lifter FA-358 are connected in sequence. The No. 1 locking hopper LH-1 and the No. 2 locking hopper LH-2 are respectively controlled through relevant steps. The invention effectively improves the automatic control level of the device, reduces the operation intensity of personnel, improves the operation stability, improves the automatic control level, adds a valve fault alarm function, improves the rapid processing ability of personnel, and shortens the troubleshooting time.
Description
Technical Field
The invention relates to the field of catalyst reforming regeneration, in particular to a continuous reforming normal-pressure regeneration system and a control method thereof.
Background
At present, two catalyst continuous regeneration process systems are commonly used in the industry, wherein one of the two catalyst continuous regeneration process systems is an axial overlapped continuous reforming process system developed by American oil products, the existing control system of the process system has no redundant arrangement for key parts of a controller, when control step sequence errors occur for many times in the production process, the whole process system needs to be restarted after cold shutdown to recover normal work, but the system recovery period is long after the cold shutdown, the process operation is complicated, and the labor intensity of operators is high. In actual work, a catalyst continuous regeneration unit control system with complete functions and flexible and controllable operation is urgently needed, and the running stability of the device is improved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a continuous reforming normal-pressure regeneration system and a control method thereof, which effectively improve the automatic control level of the device, reduce the operation intensity of process personnel and obviously improve the operation stability of the device.
The specific technical scheme of the invention is as follows:
a continuous reforming normal-pressure regeneration system comprises a first lock hopper LH-1 and a second lock hopper LH-2, wherein a reactor reduction area LS-3502, a first buffer hopper FA-351, a first collection hopper FA-352 and a first lifter FA-353 in the first lock hopper LH-1 are communicated in sequence; the first buffer hopper FA-351 is connected with the hydrogen source through two passages, wherein one passage is provided with a valve BV-1, the other passage is provided with a second flow detection device FS-3502, the first buffer hopper FA-351 sequentially passes through a valve BV-2 and a valve BV-3, a valve BV-5 is connected with a first collection hopper FA-352, a pipeline leading to a heating furnace is arranged between the valve BV-3 and the valve BV-5, and a valve BV-4 is arranged on the pipeline; the first collecting hopper FA-352 is connected with a first lifter FA-353 sequentially through a valve BV-13, a valve BV-14 and a valve BV-16, and the valve BV-14 and the valve BV-16 are connected with a combustion chamber BA-302 of the heating furnace through a valve BV-15; a pipeline is arranged between the first collecting hopper FA-352 and a nitrogen source, and nitrogen sequentially passes through a first flow detection device FS-3503, a valve BV-10 and a valve BV-12 and is led to the first collecting hopper FA-352; a pipeline leading to a combustion chamber BA-302 of the heating furnace is arranged between the valve BV-12 and the valve BV-10, and a valve BV-11 is arranged on the pipeline; the first collecting hopper FA-352 is also respectively connected with a torch system BF and a heating furnace combustion chamber BA-302 through a valve BV-9.1 and a valve BV-9.2; the hydrogen source is provided with a pipeline which is connected with a combustion chamber BA-302 of the heating furnace through a valve BV-6 and a valve BV-7, or a pipeline which is connected with a torch system BF through the valve BV-6 and the valve BV-8 in sequence; a first collection hopper pressure detection device PS-3502 and a first collection hopper level detection device LS-3501 are arranged on the first collection hopper FA-352, and a first pressure difference value indicating device PD-3501 is arranged between the first buffer hopper FA-351 and the first collection hopper FA-352; the first lifter FA-353 is always communicated with the separation hopper FA-354 of the second lock hopper LH-2, and the first lifter FA-353 is always connected with a hydrogen source;
a regenerator DC-351, a second buffer hopper FA-356, a second collecting hopper FA-357 and a second lifter FA-358 in the second lock hopper LH-2 are communicated in sequence; the second buffer hopper FA-356 is communicated with a second collection hopper FA-357 sequentially through a valve BV-42, a valve BV-43 and a valve BV-45, and the second collection hopper FA-357 is communicated with a second lifter FA-358 sequentially through a valve BV-53 and a valve BV-54; a pipeline leading to a combustion chamber BA-302 of the heating furnace is arranged between the valve BV-43 and the valve BV-45, and a valve BV-44 is arranged on the pipeline; a pipeline leading to a combustion chamber BA-302 of the heating furnace is arranged between the valve BV-54 and the valve BV-56, and a valve BV-55 is arranged on the pipeline; the second collection hopper FA-357 is provided with a second collection hopper pressure detection device PS-3504 and a second collection hopper level detection device LS-3504; the second collecting hopper FA-357 is communicated with a nitrogen source, and nitrogen sequentially passes through a third flow detection device FS-3510, a valve BV-50 and a valve BV-52 and is led to the second collecting hopper FA-357; a pipeline leading to a combustion chamber BA-302 of the heating furnace is arranged between the valve BV-50 and the valve BV-52, and a valve BV-51 is arranged on the pipeline; the second collection hopper FA-357 is communicated with a hydrogen source, hydrogen is communicated with the second collection hopper FA-357 through a valve BV-46 and a valve BV-48 in sequence, a pipeline leading to a combustion chamber BA-302 of the heating furnace is arranged between the valve BV-46 and the valve BV-48, and a valve BV-47 is arranged on the pipeline; the second collecting hopper FA-357 is respectively communicated with a torch system BF through a valve BV-49.1 and a combustion chamber BA-302 of the heating furnace through a valve BV-49.2; a second pressure difference indicator PD-3503 is disposed between the second collection hopper FA-357 and the second riser FA-358; the second riser FA-358 is in communication with a source of hydrogen and is provided with a fourth flow indicator FS-3511.
A method for controlling a continuous reforming atmospheric pressure regeneration system as set forth in claim 1, wherein said first lock hopper LH-1 control system is cyclically controlled by the steps of:
s0: a preparation phase, namely balancing the pressure of the pipeline in the first lock hopper LH-1;
S1-S3: a purge phase, flushing the first collection hopper FA-352 with nitrogen multiple times,
S4-S7: a discharging stage, discharging the catalyst to be regenerated in the first collecting hopper FA-352 to a first lifter FA-353,
S8-S11: a pressurizing stage for pressurizing the first collection hopper FA-352 to a pressure equal to that of the first buffer hopper FA-351,
S12-S14: in the charging stage, the catalyst to be regenerated in the first buffer hopper FA-351 is transferred to the first collection hopper FA-352, and charging is completed;
loop executing S0-S14, calculating long loop time T0 from S1, resetting T0 when looping to S0, and outputting a long loop alarm when long loop time T0 exceeds a predetermined value of long loop time;
the second lock hopper LH-2 control system is controlled through the following circulation steps:
s20: a preparation stage, balancing the pipeline pressure in the second lock hopper LH-2;
S21-S23: purge 1 stage, first flushing the second collection hopper FA-357 with nitrogen multiple times,
S24-S26: a pressurization stage for pressurizing the second collection hopper FA-357 to equalize the pressure of the second collection hopper FA-357 with the pressure of the second riser FA-358,
S27-S30: a discharge stage for discharging the regenerated catalyst from the second collection hopper FA-357 to a second riser FA-358,
S31-S33: purge 2 stage, second purge of second collection hopper FA-357 with nitrogen multiple times,
S34-S37: in the charging stage, the regenerated catalyst in the second buffer hopper FA-356 is transferred to the second collection hopper FA-357 to complete charging;
the loop is executed S20-S37, and a second long loop time T20 is calculated from the start of S21, and T20 is reset when looping to S20, and a long loop alarm is output when the second long loop time T20 exceeds a long loop time predetermined value.
Wherein the control method comprises the following steps:
s0: preparation phase
The method comprises the following steps:
1) setting a valve BV-1, a valve BV-11 and a valve BV-15 to be in an opening state, setting other valves to be in a closing state,
2) setting the valve BV-7 to an open state,
3) checking all current valve positions, and when the valve positions are correct, stepping to S1; meanwhile, the long cycle time T0 is set to 0.
S0 valve position: opening a valve BV-7, a valve BV-11 and a valve BV-15, and closing the other valves;
s1: purging first stage
The method comprises the following steps:
1) setting the valve BV-4 to an open state, and calculating a long cycle time T0 from when the valve BV-4 was opened,
2) setting the valve BV-9.2 to an open state when the first collection hopper pressure detection means PS-3502 detects that the pressure of the first collection hopper FA-352 is lower than the first given value PSH1-3502,
otherwise, setting the valve BV-9.1 to an open valve position, and when the pressure in the first collecting hopper FA-352 is lower than the first setpoint PSH1-3502, closing the valve BV-9.1 and setting the valve BV-9.2 to an open state,
3) when the first collection hopper pressure detection means PS-3502 detects that the pressure of the first collection hopper FA-352 is decreased and is lower than a second given value PSH2-3502, the valve BV-11 is closed,
4) checking the current valve positions, and when all the valve positions are correct, stepping to S2.
Wherein the first given value PSH1-3502 is higher than the second given value PSH 2-3502.
S1 valve position: opening a valve BV-4, a valve BV-7, a valve BV-9.2 and a valve BV-15;
s2: purge second stage
The method comprises the following steps:
1) setting the valve BV-10 to an open state,
2) when the first flow rate detection device FS-3503 detects the purge gas N2Is less than the low flow set point FSL-3503, and the first collection hopper pressure detection means PS-3502 detects that the pressure of the first collection hopper FA-352 is lower than the second given value PSH2-3502, the valve BV-12 is set to the open state to perform the purge,
3) when the opening time of the valve BV-12 reaches a preset purging time value T2, closing the valve BV-12, releasing the pressure of the first collection hopper FA-352 through the valve BV-9.2,
4) setting the valve BV-12 to an open condition when the pressure of the first collection hopper FA-352 decreases, again below the second setpoint PSH 2-3502;
5) when the opening time of the valve BV-12 reaches a preset purging time value T2, closing the valve BV-12 again;
6) and step 4) to step 5), when the cycle number reaches the preset purging number and the valve position is correct, stepping to step 3,
s2 valve position: opening a valve BV-4, a valve BV-7, a valve BV-9.2, a valve BV-10 and a valve BV-15;
s3: purge third stage
The method comprises the following steps:
1) closing a valve BV-9.2, a valve BV-10 and a valve BV-15;
2) checking all valve positions, and when all valve positions are correct, stepping to S4;
s3 valve position: the valve BV-4 and the valve BV-7 are opened.
Wherein the control method further comprises:
s4: first stage of discharge
The method comprises the following steps:
1) setting the valve BV-11 to an open state,
2) setting the valve BV-14 and the valve BV-16 to be in an opening state,
3) checking all valve positions, and when all valve positions are correct, stepping to S5;
s4 valve position: opening a valve BV-4, a valve BV-7, a valve BV-11, a valve BV-14 and a valve BV-16;
s5: second stage of discharging
The method comprises the following steps:
1) setting the valve BV-13 to be in an opening state, calculating the opening time of the valve BV-13,
2) when the opening time of the valve BV-13 reaches T5, stepping to S6A, wherein T5 is the preset value of the opening time of the valve BV-13;
s5 valve position: opening a valve BV-4, a valve BV-7, a valve BV-11, a valve BV-13, a valve BV-14 and a valve BV-16;
S6A: third stage of discharge
The method comprises the following steps:
1) closing the valve BV-13, calculating the closing time of the valve BV-13,
2) when the closing time of the valve BV-13 reaches T6A, stepping to S6B, wherein T6A is the preset value of the closing time of the valve BV-13;
S6A valve position: opening a valve BV-4, a valve BV-7, a valve BV-11, a valve BV-14 and a valve BV-16;
S6B: fourth stage of discharging
The method comprises the following steps:
1) closing the valve BV-14, calculating the closing time of the valve BV-14,
2) checking the valve positions when the closing time of the valve BV-14 reaches T6B, and stepping to S7 when all the valve positions are correct;
said T6B being a preset value of the closing time of the valve BV-14,
S6B valve position: opening a valve BV-4, a valve BV-7, a valve BV-11 and a valve BV-16;
s7: fifth stage of discharge
The method comprises the following steps:
1) closing the valve BV-16;
2) adding 1 to the conveying counting number of the LH-1 lifter;
3) checking all valve positions, and when all valve positions are correct, stepping to S8;
s7 valve position: the valve BV-4, the valve BV-7 and the valve BV-11 are opened.
Wherein the control method further comprises:
s8: a first stage of pressurization
The method comprises the following steps:
1) setting the valve BV-15 to be in an opening state, and closing the valve BV-4 and the valve BV-7;
2) checking all valve positions, and when all valve positions are correct, stepping to S9;
s8 valve position: opening a valve BV-11 and a valve BV-15;
s9: second stage of pressurization
The method comprises the following steps:
1) setting the valve BV-8 to an open state,
2) checking all valve positions, and when all valve positions are correct and the pressure difference indicating device PD-3501 indicates that the pressure difference is smaller than the low pressure difference set value PDSH-3501, stepping to S10;
s9 valve position: opening a valve BV-8, a valve BV-11 and a valve BV-15;
s10: third stage of pressurization
1) Setting a valve BV-1, a valve BV-5 and a valve BV-6 to be in an opening state,
2) checking all valve positions, when all valve positions are correct and when the pressure difference indicating device PD-3501 indicates that the pressure difference is close to 0, stepping to S11,
s10 valve position: opening a valve BV-1, a valve BV-5, a valve BV-6, a valve BV-8, a valve BV-11 and a valve BV-15;
s11: pressurizing the fourth stage
The method comprises the following steps:
1) a shut-off valve BV-6 and a valve BV-8,
2) comparing the flow measured by the second flow detection device FS-3502 with the magnitude relation of the second low flow set value FSL-3502;
3) calculating the time when the flow is less than the second low flow set value FSL-3502,
when the time for which the flow rate is less than the second low flow rate set value FSL-3502 is not less than T11, and the level of the first collection hopper level detection device LS-3501 is less than the level set value LSH-3501, and when the first buffer hopper pressure detection device PS-3501 detects that the pressure is greater than the first given value PSH1-3502, step to S12,
otherwise, the operation is not executed;
the T11 is a time preset value that the measured flow of FS-3502 is smaller than the second low flow set value FSL-3502,
s11 valve position: the valve BV-1, the valve BV-5, the valve BV-11 and the valve BV-15 are opened.
Wherein the control method further comprises:
s12: first stage of charging
The method comprises the following steps:
1) setting the valve BV-3 to an open state,
2) checking all valve positions, and when all valve positions are correct, stepping to S13;
s12 valve position: opening a valve BV-1, a valve BV-3, a valve BV-5, a valve BV-11 and a valve BV-15;
s13: second stage of charging
1) Setting the valve BV-2 to an open state,
2) defining the time from the opening of the valve BV-2 to the detection of LS-3501 that the material level thereof reaches the full as T13,
when T13 is less than the minimum time set value and LS-3501 detects that the material level is full, an abnormal charging alarm is output;
when the minimum time set value is less than or equal to T13 and less than the maximum time set value and LS-3501 detects that the material level is full, step is carried out to S14A,
when T13 is larger than or equal to the maximum time set value and LS-3501 detects that the material level is not full, stepping to S14A is carried out;
wherein the minimum time set value is less than the normal filling time value, and the maximum time set value is greater than the normal filling time value;
S14A: third stage of charging
The method comprises the following steps:
1) and closing the valve BV-2,
2) and the position of the valve is checked,
3) calculating time from the closing of the valve BV-2, and when the closing time of the valve BV-2 reaches T14A and the valve position is correct, stepping to S14B, wherein T14A is a set value of the closing time of the valve BV-2;
S14B: fourth stage of charging
The method comprises the following steps:
1) and closing the valve BV-3,
2) checking the valve position
3) And calculating the time from the closing of the valve BV-3, and when the time of closing the valve BV-3 reaches T14B and the valve position is correct, circulating to S0, wherein T14B is the set value of the closing time of the valve BV-3.
Wherein the control method further comprises:
s20: preparation phase
The method comprises the following steps:
1) setting the valve BV-44 and the valve BV-51 to be in an opening state,
2) setting the valve BV-47 and the valve BV-55 to be in an opening state,
3) checking the valve position, checking the material level of an LS-3502 reduction area of the reactor, and when the valve position is correct and the LS-3502 detects that the material level reaches the LSL-3502, stepping to S21; while the second long cycle time T20 is set to 0,
the LSL-3502 is a low level set value.
Valve position: opening a valve BV-44, a valve BV-47, a valve BV-51 and a valve BV-55;
s21: purge 1 first stage
The method comprises the following steps:
1) the second long cycle time T20 is started,
when the second collection hopper pressure detection means PS-3504 detects that the pressure of the second collection hopper FA-357 is less than the third given value PSH1-3504, setting the valve BV-49.2 to an open state;
otherwise, setting the valve BV-49.1 to an open state, and when the pressure drops to the third setpoint PSH1-3504, closing the valve BV-49.1 and setting the valve BV-49.2 to an open state;
2) when the second collecting hopper pressure detection device PS-3504 detects that the pressure of the second collecting hopper FA-357 is less than a fourth given value PSH2-3504, closing the valve BV-51;
3) checking all valve positions, and when all valve positions are correct, stepping to S22;
wherein the third given value PSH1-3504 > the fourth given value PSH 2-3504;
s21 valve position: opening a valve BV-44, a valve BV-47, a valve BV-49.2 and a valve BV-55;
s22: purge 1 second stage
1) Setting the valve BV-50 to an open state,
2) when the third flow rate detection device FS-3510 detects the purge gas N2Is lower than the third low flow set point FSL-3510 and the second collection hopper pressure detection means PS-3504 detects a pressure lower than the low pressure alarm set point PSL-3504, setting the valve BV-52 to an open state;
3) when the opening time of the valve BV-52 reaches a preset purging time value T22, closing the valve BV-52, and releasing the pressure of the second collection hopper FA-357 through the valve BV-49.2;
4) when the pressure of the second collecting hopper FA-357 is reduced to a low-pressure alarm set value PSL-3504, setting the valve BV-52 to be in an opening state;
5) when the opening time of the valve BV-52 reaches T22, closing the valve BV-52, wherein the T22 is the opening time set value of the valve BV-52;
6) and step 4) to step 5), when the cycle number reaches the preset purging number and all the valve positions are correct, stepping to step 23,
s22 valve position: opening a valve BV-44, a valve BV-47, a valve BV-49.2, a valve BV-50 and a valve BV-55;
s23: purge 1 third stage
The method comprises the following steps:
1) a shut-off valve BV-47, a valve BV-49.2, a valve BV-50 and a valve BV-55,
2) checking all valve positions, and when all valve positions are correct, stepping to S24;
s23 valve position: the valve BV-44 is opened.
Wherein the control method further comprises:
s24: a first stage of pressurization
The method comprises the following steps:
1) setting the valve BV-51 to an open state,
2) setting the valve BV-48 and the valve BV-54 to be in an opening state,
3) calculating the duration when the second pressure differential indicator PD-3503 indicates that the pressure differential is greater than the high pressure differential set point PDSH-3503 and FS-3511 detects flow,
4) when the duration is greater than a set value T24 of the time in 3), checking all valve positions, and when the valve positions are correct, stepping to S25;
s24 valve position: opening a valve BV-44, a valve BV-48, a valve BV-51 and a valve BV-54;
s25: second stage of pressurization
The method comprises the following steps:
1) setting the valve BV-46 to an open state,
2) when PD-3503 indicates that the differential pressure is 0, step to S26;
s26: third stage of pressurization
The method comprises the following steps:
1) a shut-off valve BV-46 and a valve BV-48,
2) checking the valve position, and stepping to S27 when the pressure of the FA-357 is greater than a third given value PSH 1-3504;
s26 valve position: the valve BV-44, the valve BV-51 and the valve BV-54 are opened.
Wherein the control method further comprises:
s27: first stage of discharge
The method comprises the following steps:
1) setting the valve BV-47 and the valve BV-56 to be in an opening state,
2) checking the valve position, and when the valve position is correct, stepping to S28;
s27 valve position: opening a valve BV-44, a valve BV-47, a valve BV-51, a valve BV-54 and a valve BV-56;
s28: second stage of discharging
The method comprises the following steps:
1) setting the valve BV-53 to be in an opening state, calculating the opening time of the valve BV-53,
2) when the opening time of the valve BV-53 reaches T28, step S29A,
the T28 is a preset value of the opening time of a valve BV-53;
S29A: third stage of discharge
The method comprises the following steps:
1) closing the valve BV-53, calculating the closing time of the valve BV-53,
2) checking the valve positions when the closing time of the valve BV-53 reaches T29A, stepping to S29A when all the valve positions are correct, wherein T29A is the preset value of the closing time of the valve BV-53,
S29A valve position: opening a valve BV-44, a valve BV-47, a valve BV-51, a valve BV-54 and a valve BV-56;
S29B: fourth stage of discharging
The method comprises the following steps:
1) closing the valve BV-54, calculating the closing time of the valve BV-54,
2) checking the valve positions when the closing time of the valve BV-54 reaches T29B, stepping to S30 when all the valve positions are correct, wherein T29B is the preset value of the closing time of the valve BV-54,
S29B valve position: opening a valve BV-44, a valve BV-47, a valve BV-51 and a valve BV-56;
s30: fifth stage of discharge
The method comprises the following steps:
1) and closing the valve BV-56,
2) when the abnormal charging alarm is not received, adding 1 to an LH-2 conveying counter; otherwise, the conveying counter does not count;
3) checking the valve positions, and when all the valve positions are correct, stepping to S31;
s30 valve position: the valve BV-44, the valve BV-47 and the valve BV-51 are opened.
Wherein the control method further comprises:
s34: first stage of charging
The method comprises the following steps:
1) setting the valve BV-51 to an open state,
2) setting the valve BV-43 and the valve BV-45 to be in an opening state,
3) checking the valve positions, and when all the valve positions are correct, stepping to S35;
s35: second stage of charging
The method comprises the following steps:
1) setting the valve BV-42 to an open state,
2) defining the time from the opening of the valve BV-42 to the time when LS-3504 indicates that it is full as T35, calculating T35,
when T35 is less than the minimum time set value and LS-3504 detects that the material level is full, an abnormal charging alarm is output;
when the minimum time set value is not more than T35 and less than the maximum time set value and LS-3504 detects that the material level is full, stepping to S36A;
when T35 is more than or equal to the maximum time set value and LS-3504 detects that the material level is not full, step is carried out to S36A,
wherein the minimum time set value is less than the normal filling time value, and the maximum time set value is greater than the normal filling time value;
S36A: third stage of charging
The method comprises the following steps:
1) closing the valve BV-42, calculating the time from the closing of the valve BV-42,
2) checking all valve positions, and when all valve positions are correct and the closing time of the valve BV-42 reaches a set value T36A, stepping to S36B;
S36A valve position: opening a valve BV-43, a valve BV-45, a valve BV-47, a valve BV-51 and a valve BV-55;
S36B: fourth stage of charging
The method comprises the following steps:
1) closing the valve BV-43, calculating the time from the closing of the valve BV-43,
2) and the position of the valve is checked,
3) when the closing time of the valve BV-43 reaches a set value T36B and all the valve positions are correct, stepping to S37;
S36B valve position: opening a valve BV-45, a valve BV-47, a valve BV-51 and a valve BV-55;
s37: fifth stage of charging
The method comprises the following steps:
1) and closing the valve BV-45,
2) checking the valve positions, and circulating to S20 when all the valve positions are correct;
s37 valve position: the valve BV-47, the valve BV-51 and the valve BV-55 are opened.
Advantageous effects
The continuous reforming normal-pressure regeneration system and the control system thereof effectively improve the automatic control level of the device, reduce the operation intensity of process personnel and obviously improve the operation stability of the device; the setting of the valve operation time is increased, and the automation control level is improved; the valve operation fault alarm function is added, when stepping logic is suspended, maintainers can conveniently judge the reason of the suspension of the current step through a stepping graph, the quick processing capacity of the maintainers is improved, and the fault maintenance time is shortened.
Drawings
FIG. 1 is a schematic diagram of a continuous reforming atmospheric regeneration system of the present invention.
Detailed Description
The continuous reforming normal pressure regeneration system used in the present invention, as shown in fig. 1, includes a first lock hopper LH-1 and a second lock hopper LH-2.
In the first lock hopper LH-1, the reactor reduction zone LS-3502, the first buffer hopper FA-351, the first collection hopper FA-352 and the first lifter FA-353 are communicated in sequence. Specifically, the reactor reduction zone LS-3502 is connected to the second riser FA-358 of lock hopper number two LH-2 to continuously receive regenerated catalyst. Two passages are arranged between the first buffer hopper FA-351 and the hydrogen source for connection, one passage is provided with a valve BV-1 for controlling the on-off of hydrogen, the other passage is provided with a second flow detection device FS-3502, the first buffer hopper FA-351 sequentially passes through a valve BV-2 and a valve BV-3, a valve BV-5 is connected with the first collection hopper FA-352, a pipeline leading to a heating furnace is arranged between the valve BV-3 and the valve BV-5, and a valve BV-4 is arranged on the pipeline. The first collecting hopper FA-352 is connected with a first lifter FA-353 through a valve BV-13, a valve BV-14 and a valve BV-16 in sequence, and the valve BV-14 and the valve BV-16 are connected with a combustion chamber BA-302 of the heating furnace through a valve BV-15. A pipeline is arranged between the first collecting hopper FA-352 and a nitrogen source, and nitrogen sequentially passes through a first flow detection device FS-3503, a valve BV-10 and a valve BV-12 to be led to the first collecting hopper FA-352. And a pipeline leading to a combustion chamber BA-302 of the heating furnace is arranged between the valve BV-12 and the valve BV-10, and a valve BV-11 is arranged on the pipeline so as to control the discharge of nitrogen in the pipeline. The first collecting hopper FA-352 is also respectively connected with a torch system BF and a heating furnace combustion chamber BA-302 through a valve BV-9.1 and a valve BV-9.2. The hydrogen source is provided with a pipeline connected with a combustion chamber BA-302 of the heating furnace through a valve BV-6 and a valve BV-7, or a pipeline connected with a torch system BF through the valve BV-6 and the valve BV-8 in sequence, so as to discharge the hydrogen in the pipeline. The first collection hopper FA-352 is provided with a first collection hopper pressure detection device PS-3502 and a first collection hopper level detection device LS-3501. A first pressure difference indicator PD-3501 is provided between the first buffer hopper FA-351 and the first collection hopper FA-352. The first riser FA-353 is always in communication with the disengaging hopper FA-354 of the second lock hopper LH-2, and the first riser FA-353 is always connected to a source of hydrogen so that the catalyst to be regenerated can be continuously fed to the disengaging hopper FA-354.
The control method of the first lock hopper LH-1 and the control method of the second lock hopper LH-2 will be described below.
Said lock hopper LH-1 has the following control phases,
s0: a preparation phase, namely balancing the pressure of the pipeline in the first lock hopper LH-1;
S1-S3: a purge phase, flushing the first collection hopper FA-352 with nitrogen multiple times,
S4-S7: a discharging stage, discharging the catalyst to be regenerated in the first collecting hopper FA-352 to a first lifter FA-353,
S8-S11: a pressurizing stage for pressurizing the first collection hopper FA-352 to a pressure equal to that of the first buffer hopper FA-351,
S12-S14: in the charging stage, the catalyst to be regenerated in the first buffer hopper FA-351 is transferred to the first collection hopper FA-352, and charging is completed;
the loop is executed from S0 to S14, and the long loop time T0 is calculated from S1, and T0 is reset when looping to S0, and a long loop alarm is output when the long loop time T0 exceeds a long loop time predetermined value.
Specifically, the lock hopper LH-1 of the present invention is controlled by the following steps:
s0: preparation phase
The method comprises the following steps:
1) setting a valve BV-1, a valve BV-11 and a valve BV-15 to be in an opening state, setting other valves to be in a closing state,
2) setting the valve BV-7 to an open state,
3) checking all current valve positions, and when the valve positions are correct, stepping to S1; meanwhile, the long cycle time T0 is set to 0.
S0 valve position: the valves BV-7, BV-11, BV-15 are opened, and the rest are closed.
When the procedure is in S0, all valves are in a safe position, namely the valve BV-1 is opened to ensure that the reactor and the catalyst collecting hopper are isolated, and the valve BV-11 and the valve BV-15 are opened to ensure that the part containing hydrogen and the part containing nitrogen in the system are isolated. The remaining valves remain closed.
After the above state is confirmed, the valve BV-7 is set to be in an open state, so that the hydrogen possibly remaining in the hydrogen pipeline is completely exhausted, and a safe environment is provided for the next step. During which the regeneration system is waited for the production of the catalyst available for the reaction, and when the catalyst reaches a preset value, the valve BV-1 is closed and the next operation is carried out.
S1: purging first stage
The method comprises the following steps:
1) setting the valve BV-4 to an open state, and calculating a long cycle time T0 from when the valve BV-4 was opened,
2) setting the valve BV-9.2 to an open state when the first collection hopper pressure detection means PS-3502 detects that the pressure of the first collection hopper FA-352 is lower than the first given value PSH1-3502,
otherwise, setting the valve BV-9.1 to an open valve position, and when the pressure in the first collecting hopper FA-352 is lower than the first setpoint PSH1-3502, closing the valve BV-9.1 and setting the valve BV-9.2 to an open state,
3) when the first collection hopper pressure detection means PS-3502 detects that the pressure of the first collection hopper FA-352 is decreased and is lower than a second given value PSH2-3502, the valve BV-11 is closed,
4) checking the current valve positions, and when all the valve positions are correct, stepping to S2.
Wherein the first given value PSH1-3502 is higher than the second given value PSH 2-3502.
S1 valve position: the valve BV-4, the valve BV-7, the valve BV-9.2 and the valve BV-15 are opened.
The arrangement is that when the pressure is not high, the pressure can be directly released to the combustion chamber BA-302 of the heating furnace through the valve BV-9.2, and the step that when the pressure is high, the pressure is firstly released to a flare system through the valve BV9.1 is avoided. The purpose of closing the valve BV-11 is to prepare it safely for the next step.
In the embodiment, the first given value PSH1-3502 is 48kPa, and the second given value PSH2-3502 is 21 kPa.
S2: purge second stage
The method comprises the following steps:
1) setting the valve BV-10 to an open state,
2) when the first flow rate detection device FS-3503 detects the purge gas N2Is less than the low flow set point FSL-3503, and the first collection hopper pressure detection means PS-3502 detects that the pressure of the first collection hopper FA-352 is lower than the second given value PSH2-3502, the valve BV-12 is set to the open state to perform the purge,
3) when the opening time of the valve BV-12 reaches a preset purging time value T2, closing the valve BV-12, releasing the pressure of the first collection hopper FA-352 through the valve BV-9.2,
4) setting the valve BV-12 to an open condition when the pressure of the first collection hopper FA-352 decreases, again below the second setpoint PSH 2-3502;
5) when the opening time of the valve BV-12 reaches a preset purging time value T2, closing the valve BV-12 again;
6) and step 4) to step 5), when the cycle number reaches the preset purging number and the valve position is correct, stepping to step 3.
S2 valve position: the valve BV-4, the valve BV-7, the valve BV-9.2, the valve BV-10 and the valve BV-15 are opened.
The first collection hopper FA-352 is filled with N after opening the valves BV-10 and BV-122And (4) performing purging, wherein the pressure is increased in the purging process, after the preset purging time value T2 is reached, discharging the purging gas to the combustion chamber BA-302 of the heating furnace through a valve BV-9.2, wherein the pressure of the first collection hopper FA-352 is reduced while discharging, and when the pressure is reduced, opening the valve BV-12 again for purging.
In step S2, the first flow sensing device FS-3503 must be zero flow at a given time when the valve BV-12 is closed. If the first traffic detection means FS-3503 detects that there is traffic, the stepping should be stopped, where a check is made to avoid errors.
In this embodiment, the low flow setting value FSL-3503 is 65m3And/h, the preset purging time value T2 is 30s, and the preset purging times are 2 times.
S3: purge third stage
The method comprises the following steps:
1) closing valve BV-9.2, valve BV-10 and valve BV-15.
2) Checking all valve positions, and when all valve positions are correct, stepping to S4.
S3 valve position: the valve BV-4 and the valve BV-7 are opened.
The purge stage for the first collection hopper FA-352 is ended and prepared for S4 by closing valves BV-9.2, BV-10, BV-15.
S4: first stage of discharge
The method comprises the following steps:
1) setting the valve BV-11 to an open state,
2) setting the valve BV-14 and the valve BV-16 to be in an opening state,
3) checking all valve positions, and when all valve positions are correct, stepping to S5.
S4 valve position: the valve BV-4, the valve BV-7, the valve BV-11, the valve BV-14 and the valve BV-16 are opened.
In the step S4: setting the valve BV-11 to an open state, N in the pipeline2It can be vented directly to furnace combustion chamber BA-302, thereby achieving isolation of the nitrogen manifold from the lock hopper. At the same time, the valve BV-14 and the valve BV-16 are opened in preparation for discharging.
S5: second stage of discharging
The method comprises the following steps:
1) setting the valve BV-13 to be in an opening state, calculating the opening time of the valve BV-13,
2) when the opening time of the valve BV-13 reaches T5, stepping to S6A, wherein T5 is the preset value of the opening time of the valve BV-13;
s5 valve position: the valve BV-4, the valve BV-7, the valve BV-11, the valve BV-13, the valve BV-14 and the valve BV-16 are opened.
In step S5, the valve BV-13 is set to the open state, i.e. the unloading is started, and the timing is started, and the step is continued when the timing time reaches the preset time.
In this embodiment, T5 is 48 s.
S6A: third stage of discharge
The method comprises the following steps:
1) closing the valve BV-13, calculating the closing time of the valve BV-13,
2) when the closing time of the valve BV-13 reaches T6A, stepping to S6B, wherein T6A is the preset value of the closing time of the valve BV-13;
S6A valve position: the valve BV-4, the valve BV-7, the valve BV-11, the valve BV-14 and the valve BV-16 are opened.
In step S6A: the discharge was stopped by closing the valve BV-13 and timing was started to ensure that the catalyst fines in the discharge line were completely eliminated to reduce valve seat wear.
In this embodiment, T6A is 10 s.
S6B: fourth stage of discharging
The method comprises the following steps:
1) closing the valve BV-14, calculating the closing time of the valve BV-14,
2) checking the valve positions when the closing time of the valve BV-14 reaches T6B, and stepping to S7 when all the valve positions are correct;
said T6B being a preset value of the closing time of the valve BV-14,
S6B valve position: the valve BV-4, the valve BV-7, the valve BV-11 and the valve BV-16 are opened.
In S5 to S6B, by controlling the opening or closing time of each valve, the spent catalyst can be fully, quantitatively and stably discharged, and the stable operation of each step is ensured.
In this embodiment, T6B is 10 s.
S7: fifth stage of discharge
The method comprises the following steps:
1) and closing the valve BV-16.
2) Adding 1 to the conveying counting number of the LH-1 lifter;
3) checking all valve positions, and when all valve positions are correct, stepping to S8.
S7 valve position: the valve BV-4, the valve BV-7 and the valve BV-11 are opened.
When the valve BV-16 is closed in S7, this indicates that LH-1 has been lifted to the regenerator and therefore the delivery counter number for the lifter is incremented by "1". The counter is used for recording the lifting times of the catalyst, and the balance between the quantity of the catalyst discharged from the reactor and the quantity of the catalyst charged back is ensured.
S8: a first stage of pressurization
The method comprises the following steps:
1) setting the valve BV-15 to be in an opening state, closing the valve BV-4 and the valve BV-7.
2) Checking all valve positions, and when all valve positions are correct, stepping to S9.
S8 valve position: the valve BV-11 and the valve BV-15 are opened.
The valve BV-15 valve opens to isolate the lift gas system of the lift from the first collection hopper FA-352 in preparation for pressurizing the lock hopper.
S9: second stage of pressurization
The method comprises the following steps:
1) setting the valve BV-8 to an open state,
2) checking all valve positions, and when all valve positions are correct and the pressure difference indicating device PD-3501 indicates that the pressure difference is less than the low pressure difference set value PDSH-3501, stepping to S10.
S9 valve position: the valve BV-8, the valve BV-11 and the valve BV-15 are opened.
The valve BV8 is set to the open state in preparation for the next step S10.
In this embodiment, the low pressure difference set value PDSH-3501 is 2 kPa.
S10: third stage of pressurization
1) Setting valves BV-1, BV-5 and BV-6 to be in an open state
2) Check all valve positions, step to S11 when all valve positions are correct and when the pressure difference indicating device PD-3501 indicates that the pressure difference is close to 0.
S10 valve position: the valve BV-1, the valve BV-5, the valve BV-6, the valve BV-8, the valve BV-11 and the valve BV-15 are opened.
The valve BV-5 on the catalyst line was opened to allow pressure equalization between the valve BV-3 and the valve BV-5. At the end of the step, the only pressure unequal in the system is the valve body and ball chamber of valve BV-3 only. This minimizes pressure variations in the pipeline.
S11: pressurizing the fourth stage
The method comprises the following steps:
1) a shut-off valve BV-6 and a valve BV-8,
2) comparing the flow measured by the second flow detection device FS-3502 with the magnitude relation of the second low flow set value FSL-3502;
3) calculating the time when the flow is less than the second low flow set value FSL-3502,
calculating the magnitude relation between the material level of the first collecting hopper material level detection device LS-3501 and a material level set value LSH-3501,
the magnitude relation of the pressure of the first buffer hopper pressure detecting means PS-3501 to the first given value PSH1-3502 is calculated,
when the time for which the flow rate is less than the second low flow rate set value FSL-3502 is not less than T11, and the level of the first collection hopper level detection device LS-3501 is less than the level set value LSH-3501, and when the first buffer hopper pressure detection device PS-3501 detects that the pressure is greater than the first given value PSH1-3502, step to S12,
otherwise, the operation is not executed;
and the T11 is a time preset value that the measured flow of the FS-3502 is smaller than the second low flow set value FSL-3502.
S11 valve position: the valve BV-1, the valve BV-5, the valve BV-11 and the valve BV-15 are opened.
In this step, the level indication of LS-3501 should normally be low, since the lock hopper was already unloaded at S5. If the indication is high, there are two possibilities, one is that the LS-3501 circuit is faulty, resulting in a faulty level indication, and the other is that the discharge line is blocked, and the hopper is not actually discharging. Therefore, when the conditions in 3), i.e., the charging conditions, cannot be satisfied at the same time, the step of charging should not be continued.
In this embodiment, the second low flow setting value FSL-3502 is 20m3The fill level setpoint LSH-3501 is 75% and T11 is 30 s.
S12: first stage of charging
The method comprises the following steps:
1) setting the valve BV-3 to an open state,
2) checking all valve positions, and when all valve positions are correct, stepping to S13.
S12 valve position: the valve BV-1, the valve BV-3, the valve BV-5, the valve BV-11 and the valve BV-15 are opened.
S13: second stage of charging
1) Setting the valve BV-2 to an open state,
2) defining the time from the opening of the valve BV-2 to the detection of LS-3501 that the material level thereof reaches the full as T13,
when T13 is less than the minimum time set value and LS-3501 detects that the material level is full, an abnormal charging alarm is output;
when the minimum time set value is less than or equal to T13 and less than the maximum time set value and LS-3501 detects that the material level is full, step is carried out to S14A,
when T13 is not less than the maximum time set value and LS-3501 detects that its material level is not full, step is made to S14A.
Wherein the minimum time setting value is less than the normal filling time value, and the maximum time setting value is greater than the normal filling time value.
Obviously, if T13 < minimum time set point, but LS-3501 detects that it is full, it may be because of an abnormal catalyst flow, or LS-3501 makes an error. And the catalyst flow abnormality may be caused by an abnormal differential pressure or by plugging of the catalyst line. In either case, an abnormal charging alarm should be generated.
In this embodiment, the minimum time setting value is 80s, and the maximum time setting value is 340 s.
S14A: third stage of charging
The method comprises the following steps:
1) and closing the valve BV-2,
2) and the position of the valve is checked,
3) and calculating the time from the closing of the valve BV-2, and when the time for closing the valve BV-2 reaches T14A and the valve position is correct, stepping to S14B, wherein T14A is the set value of the closing time of the valve BV-2.
By setting the setpoint T14A, a buffering time for charge dust settling can be provided.
In this embodiment, T14A is 10 s.
S14B: fourth stage of charging
The method comprises the following steps:
1) and closing the valve BV-3,
2) checking the valve position
3) And calculating the time from the closing of the valve BV-3, and when the time of closing the valve BV-3 reaches T14B and the valve position is correct, circulating to S0, wherein T14B is the set value of the closing time of the valve BV-3.
And circularly executing S0-S14B, and outputting a long-circulation alarm when the long circulation time T0 reaches the preset value of the long circulation time.
In this embodiment, T14B is 10s, and the long cycle time predetermined value is 1800 s.
Reference will now be made to the second lock hopper LH-2, wherein regenerator DC-351, second buffer hopper FA-356, second collection hopper FA-357 and second riser FA-358 are connected in series in the second lock hopper LH-2. Specifically, the second buffer hopper FA-356 is in communication with a second collection hopper FA-357 through a valve BV-42, a valve BV-43, and a valve BV-45 in that order, and the second collection hopper FA-357 is in communication with a second riser FA-358 through a valve BV-53 and a valve BV-54 in that order. A pipeline leading to a combustion chamber BA-302 of the heating furnace is arranged between the valve BV-43 and the valve BV-45, and a valve BV-44 is arranged on the pipeline. A pipeline leading to a combustion chamber BA-302 of the heating furnace is arranged between the valve BV-54 and the valve BV-56, and a valve BV-55 is arranged on the pipeline.
The second collection hopper FA-357 is provided with a second collection hopper pressure detecting device PS-3504 to detect the pressure in the second collection hopper FA-357, and a second collection hopper level detecting device LS-3504 to detect the level of the second collection hopper FA-357. The second collecting hopper FA-357 is communicated with a nitrogen source, and nitrogen sequentially passes through a third flow detection device FS-3510, a valve BV-50 and a valve BV-52 and is led to the second collecting hopper FA-357. And a pipeline leading to a combustion chamber BA-302 of the heating furnace is arranged between the valve BV-50 and the valve BV-52, and a valve BV-51 is arranged on the pipeline so as to control the discharge of nitrogen in the pipeline. The second collection hopper FA-357 is communicated with a hydrogen source, hydrogen sequentially passes through a valve BV-46 and a valve BV-48 to be led to the second collection hopper FA-357, a pipeline leading to a combustion chamber BA-302 of the heating furnace is arranged between the valve BV-46 and the valve BV-48, and a valve BV-47 is arranged on the pipeline. The second collection hopper FA-357 is respectively communicated with a torch system BF through a valve BV-49.1 and a combustion chamber BA-302 of the heating furnace through a valve BV-49.2.
A second pressure difference indicator PD-3503 is provided between the second collection hopper FA-357 and the second riser FA-358. The second riser FA-358 is in communication with a source of hydrogen and is provided with a fourth flow indicator FS-3511.
The second locking hopper control system is controlled by the following circulation steps:
s20: preparation phase
The method comprises the following steps:
1) setting the valve BV-44 and the valve BV-51 to be in an opening state,
2) setting the valve BV-47 and the valve BV-55 to be in an opening state,
3) checking the valve position, checking the material level of an LS-3502 reduction area of the reactor, and when the valve position is correct and the LS-3502 detects that the material level reaches the LSL-3502, stepping to S21; while the second long cycle time T20 is set to 0,
the LSL-3502 is a low level set value.
Valve position: the valve BV-44, the valve BV-47, the valve BV-51 and the valve BV-55 are opened.
In this step, valves BV-44 and BV-51 are opened to ensure the separation of the nitrogen-containing part and the hydrogen-containing part of the system.
S21: purge 1 first stage
The method comprises the following steps:
1) the second long cycle time T20 is started,
when the second collection hopper pressure detection means PS-3504 detects that the pressure of the second collection hopper FA-357 is less than the third given value PSH1-3504, setting the valve BV-49.2 to an open state;
otherwise, setting the valve BV-49.1 to an open state, and when the pressure drops to the third setpoint PSH1-3504, closing the valve BV-49.1 and setting the valve BV-49.2 to an open state;
2) and when the second collection hopper pressure detection device PS-3504 detects that the pressure of the second collection hopper FA-357 is less than the fourth given value PSH2-3504, closing the valve BV-51.
3) Checking all valve positions, and when all valve positions are correct, stepping to S22.
Wherein the third given value PSH1-3504 > the fourth given value PSH 2-3504.
S21 valve position: the valve BV-44, the valve BV-47, the valve BV-49.2 and the valve BV-55 are opened.
The arrangement is that when the pressure is not high, the pressure can be directly released to the combustion chamber BA-302 of the heating furnace through the valve BV-49.2, thereby saving steps. The purpose of closing the valve BV-51 is to prepare it safely for the next step.
Wherein the third given value PSH1-3504 is 18kPa and the fourth given value PSH2-3504 is 16 kPa.
S22: purge 1 second stage
1) Setting the valve BV-50 to an open state,
2) when the third flow rate detection device FS-3510 detects the purge gas N2Is lower than the third low flow set point FSL-3510 and the second collection hopper pressure detection means PS-3504 detects a pressure lower than the low pressure alarm set point PSL-3504, setting the valve BV-52 to an open state;
3) when the opening time of the valve BV-52 reaches a preset purging time value T22, closing the valve BV-52, and releasing the pressure of the second collection hopper FA-357 through the valve BV-49.2;
4) when the pressure of the second collecting hopper FA-357 is reduced to a low-pressure alarm set value PSL-3504, setting the valve BV-52 to be in an opening state;
5) when the opening time of the valve BV-52 reaches T22, closing the valve BV-52, wherein the T22 is the opening time set value of the valve BV-52;
6) and step 4) to step 5), when the cycle number reaches the preset purging number and all the valve positions are correct, stepping to step 23.
S22 valve position: the valve BV-44, the valve BV-47, the valve BV-49.2, the valve BV-50 and the valve BV-55 are opened.
The second collection hopper FA-357 is fed with N after opening valves BV-50 and BV-522Purging is performed by closing the valve BV-52 after its pressure has risen and releasing the pressure to the furnace combustion chamber BA-302 through the valve BV-49.2, and by opening the valve BV-52 again when the pressure has dropped.
In step S22, when the valve BV-52 is closed, the actual flow rate sensed by the third flow sensing device FS-3510 must be zero. If a non-zero flow is detected, indicating that a flow exists, the stepping should be stopped. The step stop causes the second long cycle time T-20 to reach a predetermined value, generating a long cycle alarm, where a check is made to avoid errors.
This exampleWherein the third low flow set point FSL-3510 is 72m3The low-pressure alarm set value PSL-3504 is 18kPa, the T22 is 30s, and the preset purging times are 2 times.
S23: purge 1 third stage
The method comprises the following steps:
1) a shut-off valve BV-47, a valve BV-49.2, a valve BV-50 and a valve BV-55,
2) checking all valve positions, and when all valve positions are correct, stepping to S24.
S23 valve position: the valve BV-44 is opened.
The purge step is completed while the pressurized conditions are established.
S24: a first stage of pressurization
The method comprises the following steps:
1) setting the valve BV-51 to an open state,
2) setting the valve BV-48 and the valve BV-54 to be in an opening state,
3) calculating the duration when the second pressure differential indicator PD-3503 indicates that the pressure differential is greater than the high pressure differential set point PDSH-3503 and FS-3511 detects flow,
4) and when the duration is greater than the set value T24 of the time in 3), checking all valve positions, and when the valve positions are correct, stepping to S25.
S24 valve position: the valve BV-44, the valve BV-48, the valve BV-51 and the valve BV-54 are opened.
In this example, the high pressure difference setting PDSH-3503 is 12kPa, and T24 is 10 s.
S25: second stage of pressurization
The method comprises the following steps:
1) setting the valve BV-46 to an open state,
2) and when PD-3503 indicates that the differential pressure is 0, step to S26.
S26: third stage of pressurization
The method comprises the following steps:
1) a shut-off valve BV-46 and a valve BV-48,
2) checking the valve position, and stepping to S27 when the pressure of the FA-357 is greater than a third given value PSH 1-3504.
S26 valve position: the valve BV-44, the valve BV-51 and the valve BV-54 are opened.
S27: first stage of discharge
The method comprises the following steps:
1) setting the valve BV-47 and the valve BV-56 to be in an opening state,
2) checking the valve position, and when the valve position is correct, stepping to S28.
S27 valve position: the valve BV-44, the valve BV-47, the valve BV-51, the valve BV-54 and the valve BV-56 are opened.
And opening a valve BV-47 and a valve BV-56 to realize the isolation of the nitrogen and the hydrogen main pipe.
S28: second stage of discharging
The method comprises the following steps:
1) setting the valve BV-53 to be in an opening state, calculating the opening time of the valve BV-53,
2) when the opening time of the valve BV-53 reaches T28, step S29A,
and the T28 is a preset value of the opening time of the valve BV-53.
In this embodiment, T28 is 320 s.
S29A: third stage of discharge
The method comprises the following steps:
1) closing the valve BV-53, calculating the closing time of the valve BV-53,
2) checking the valve positions when the closing time of the valve BV-53 reaches T29A, stepping to S29A when all the valve positions are correct, wherein T29A is the preset value of the closing time of the valve BV-53,
S29A valve position: the valve BV-44, the valve BV-47, the valve BV-51, the valve BV-54 and the valve BV-56 are opened.
When the valve BV-53 is closed, the dust settling timer starts to time, so that the fine catalyst dust on the discharge pipeline can be completely eliminated, and the abrasion of the ball valve seat of the discharge valve is reduced.
In this embodiment, T29A is 10 s.
S29B: fourth stage of discharging
The method comprises the following steps:
1) closing the valve BV-54, calculating the closing time of the valve BV-54,
2) checking the valve positions when the closing time of the valve BV-54 reaches T29B, stepping to S30 when all the valve positions are correct, wherein T29B is the preset value of the closing time of the valve BV-54,
S29B valve position: the valve BV-44, the valve BV-47, the valve BV-51 and the valve BV-56 are opened.
In this embodiment, T29B is 10 s.
S30: fifth stage of discharge
The method comprises the following steps:
1) and closing the valve BV-56,
2) when the abnormal charging alarm is not received, adding 1 to an LH-2 conveying counter; otherwise the delivery counter does not count.
3) Checking the valve positions, and when all the valve positions are correct, stepping to S31.
S30 valve position: the valve BV-44, the valve BV-47 and the valve BV-51 are opened.
The counter is used for recording the lifting times of the catalyst, and the balance between the quantity of the catalyst discharged from the reactor and the quantity of the catalyst charged back is ensured.
S31: purge 2 first stage
The method comprises the following steps:
1) setting the valve BV-55 to an open state,
2) setting the valve BV-49.1 to an open state,
3) when the pressure of the second collection hopper FA-357 is reduced to a third set point PSH1-3504, closing the valve BV-49.1 and setting the valve BV-49.2 to an open state;
4) when the second collection hopper pressure detection device PS-3504 detects that the pressure of the second collection hopper FA-357 is less than the fourth given value PSH2-3504, the valve BV-51 is closed,
5) checking all valve positions, and when all valve positions are correct, stepping to S32.
S31 valve position: the valve BV-44, the valve BV-47, the valve BV-49.2 and the valve BV-55 are opened.
S32: purge 2 second stage
The method comprises the following steps:
1) setting the valve BV-50 to an open state,
2) when the third flow rate detection device FS-3510 detects the purge gas N2Is lower than the third low flow set point FSL-3510 and the second collection hopper pressure detection means PS-3504 detects a pressure lower than the low pressure alarm set point PSL-3504, setting the valve BV-52 to an open state;
3) when the opening time of the valve BV-52 reaches a preset purging time value T22, closing the valve BV-52, and releasing the pressure of the second collection hopper FA-357 through the valve BV-49.2;
4) when the pressure of the second collecting hopper FA-357 is reduced to a low-pressure alarm set value PSL-3504, setting the valve BV-52 to be in an opening state;
5) when the opening time of the valve BV-52 reaches T22, closing the valve BV-52, wherein the T22 is the opening time set value of the valve BV-52;
6) and step 4) to step 5), when the cycle number reaches the preset purging number and all the valve positions are correct, stepping to step 33.
S32 valve position: the valve BV-44, the valve BV-47, the valve BV-49.2, the valve BV-50 and the valve BV-55 are opened.
S33: purge 2 third stage
The method comprises the following steps:
1) a shut-off valve BV-44, a valve BV-49.2 and a valve BV-50,
2) and checking the valve positions, and when the second collecting hopper material level detection device LS-3504 is lower than the second material level set value LSL-3504 and all the valve positions are correct, stepping to S34.
S33 valve position: the valve BV-47 and the valve BV-55 are opened.
In this embodiment, the second level set point LSL-3504 is 75%.
S34: first stage of charging
The method comprises the following steps:
1) setting the valve BV-51 to an open state,
2) setting the valve BV-43 and the valve BV-45 to be in an opening state,
3) checking the valve positions, and when all the valve positions are correct, stepping to S35.
S35: second stage of charging
The method comprises the following steps:
1) setting the valve BV-42 to an open state,
2) defining the time from the opening of the valve BV-42 to the time when LS-3504 indicates that it is full as T35, calculating T35,
when T35 is less than the minimum time set value and LS-3504 detects that the material level is full, an abnormal charging alarm is output;
when the minimum time set value is not more than T35 and less than the maximum time set value and LS-3504 detects that the material level is full, stepping to S36A;
when T35 is more than or equal to the maximum time set value and LS-3504 detects that the material level is not full, step is carried out to S36A,
wherein the minimum time setting value is less than the normal filling time value, and the maximum time setting value is greater than the normal filling time value.
Obviously, if T35 < minimum time set point, but LS-3504 detects that it is full, it may be because of an abnormal catalyst flow, or LS-3504 is faulty. And the catalyst flow abnormality may be caused by an abnormal differential pressure or by plugging of the catalyst line. In either case, an abnormal charging alarm should be generated.
S36A: third stage of charging
The method comprises the following steps:
1) closing the valve BV-42, calculating the time from the closing of the valve BV-42,
2) checking all the valve positions, and when all the valve positions are correct and the closing time of the valve BV-42 reaches the set value T36A, stepping to S36B.
S36A valve position: the valve BV-43, the valve BV-45, the valve BV-47, the valve BV-51 and the valve BV-55 are opened.
The valve BV-42 is closed. When the valve is closed, the charge dust removal timer starts to count. The fine dust of the catalyst on the discharge pipeline can be completely eliminated, so that the abrasion of the ball valve seat of the discharge valve is reduced.
In this embodiment, the T36A is 10 s.
S36B: fourth stage of charging
The method comprises the following steps:
1) closing the valve BV-43, calculating the time from the closing of the valve BV-43,
2) checking the valve position
3) And when the closing time of the valve BV-43 reaches the set value T36B and all the valve positions are correct, step to S37.
S36B valve position: the valve BV-45, the valve BV-47, the valve BV-51 and the valve BV-55 are opened.
In this embodiment, the T36B is 10 s.
S37: fifth stage of charging
The method comprises the following steps:
1) and closing the valve BV-45,
2) checking the valve positions, and when all the valve positions are correct, circulating to S20.
S37 valve position: the valve BV-47, the valve BV-51 and the valve BV-55 are opened.
And circularly executing steps S20-S37, and outputting a long-circulation alarm when the second long circulation time T20 reaches a preset value of the second long circulation time.
In this embodiment, the second long cycle time predetermined value is 1800 s.
Claims (10)
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