CN111857196A - A method and system for controlling the rotational speed of a boiling pump - Google Patents

Abstract

The invention relates to the field of petrochemical industry and discloses a method and a system for controlling the rotating speed of a boiling pump. Wherein, the change of the rotating speed of the boiling pump is used for adjusting the material level of the reactor bed layer, and the method comprises the steps of monitoring the material level of the bed layer; and adjusting the rotating speed of the boiling pump according to the working mode of the boiling pump and the comparison result of the monitoring value and the preset value of the material level monitoring point. According to the method and the system for controlling the rotating speed of the boiling pump, the change of the rotating speed of the boiling pump is triggered according to the monitored change of the bed layer material level height, the position of the reactor catalyst bed layer material level can be adjusted in time, the catalyst bed layer material level is effectively controlled to a safe area, and the possibility of damage to equipment such as the boiling pump is reduced.

Description

A method and system for controlling the rotational speed of a boiling pump

technical field

The invention relates to the petrochemical field, in particular to a method and a system for controlling the rotational speed of a boiling pump.

Background technique

The core of the fluidized bed residue hydrogenation process technology lies in the control of the material level of the reactor bed. The material level of the reactor bed is controlled and adjusted by the rotational speed of the fluidized pump. Improper adjustment will easily cause the bed to overheat or the catalyst to circulate through the reactor. The cup enters the boiling pump inlet, which can cause the reactor to overheat or damage the boiling pump.

At present, the material level of the catalyst bed of the fluidized bed reactor is controlled manually or artificially by the same type of devices in China. When abnormal production fluctuations occur, they cannot be adjusted immediately, which can easily lead to production safety accidents and waste human resources.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the problem that the prior art cannot be adjusted at the first time when abnormal production fluctuations occur in the material level of the catalyst bed of the reactor, and to provide a method and system for controlling the rotational speed of the boiling pump, which can be adjusted in time Reactor catalyst bed level.

In order to achieve the above object, one aspect of the present invention provides a method for controlling the rotational speed of a boiling pump, wherein the change in the rotational speed of the boiling pump is used to adjust the material level of the reactor bed, and the method includes: monitoring the material level of the bed. and adjusting the rotational speed of the boiling pump according to the working mode of the boiling pump and the comparison result between the monitoring value of the material level monitoring point and the preset value.

Preferably, the material level monitoring points include at least one of the following arranged in order from top to bottom: point B, point C, point D, point E and point F;

The operating modes include at least one of the following: automatic mode, semi-automatic mode, manual mode and failure mode.

Preferably, with the boiling pump in automatic mode, one or more of the following operations are performed:

When the monitoring value at point B is greater than or equal to a preset value, control the boiling pump to slow down at a first rate for a first time, so as to reduce the material level of the bed;

When the monitored value at point C is greater than or equal to a preset value, control the boiling pump to decelerate at a second rate for a second time, so as to reduce the material level of the bed;

When the monitoring value of point E is less than or equal to the preset value, controlling the boiling pump to increase the speed at a third rate for a third time, so as to increase the material level of the bed;

When the monitoring value of point F is less than or equal to the preset value, stop adjusting the boiling pump;

Wherein, the first rate is greater than or equal to the second rate, and the first time is less than or equal to the second time.

Preferably, with the boiling pump in a semi-automatic mode, one or more of the following operations are performed:

When the monitoring value at point B is greater than or equal to the preset value, after receiving the confirmation information, the boiling pump is controlled to decelerate at a first rate for a first time, so as to reduce the material level of the bed.

When the monitoring value of point C is greater than or equal to the preset value, after receiving the confirmation information, control the boiling pump to decelerate at a second rate for a second time, so as to reduce the material level of the bed;

When the monitoring value at point E is less than or equal to the preset value, stop adjusting the boiling pump.

Wherein, the first rate is greater than or equal to the second rate, and the first time is less than or equal to the second time.

Preferably, the method further includes:

According to the working mode of the boiling pump and the detection value of the material level monitoring point, a corresponding alarm signal is triggered.

Preferably, the alarm signal includes at least one of the following: a high material level alarm signal corresponding to the point B, a high material level alarm signal corresponding to the point C, and a normal material level corresponding to the point D An alarm signal, a low material level alarm signal corresponding to the E point, and a low material level alarm signal corresponding to the F point.

Preferably, when the boiling pump is in an automatic or semi-automatic mode and the following triggering conditions are met, the boiling pump is controlled to switch to a failure mode:

The alarm signal at point C is triggered, but the alarm signal at point D is not triggered; or

The B point alarm signal is triggered, but the C point alarm signal and/or the D point alarm signal is not triggered.

Preferably, when the boiling pump is in the failure mode, the following operations are performed:

Controlling the boiling pump to perform at least one adjustment of: dropping a first number of revolutions, stopping a third time interval; and

Switch to manual mode.

A second aspect of the present invention provides a system for controlling the rotational speed of a boiling pump, wherein the change in the rotational speed of the boiling pump is used to adjust the material level of the reactor bed, and the system includes:

The change of the rotational speed of the boiling pump is used to adjust the material level of the bed, and the system includes:

monitoring equipment for obtaining the level of the bed; and

The controller is configured to execute the method for controlling the rotation speed of the boiling pump as described above.

Preferably, the monitoring device includes a nuclear level meter.

The method and system for controlling the rotational speed of the boiling pump involved in the present application can trigger the change of the rotational speed of the boiling pump by monitoring the height of the material level of the bed, so that the position of the material level of the catalyst bed of the reactor can be adjusted in time, and the catalyst bed can be effectively controlled. Layer the material level to a safe area, reducing the possibility of damage to equipment such as boiling pumps.

Description of drawings

1 is a flow chart of a method for controlling the rotational speed of a boiling pump according to the present application;

Figure 2 is a schematic diagram of a reactor bed level according to some embodiments of the present application;

3 is a schematic diagram of a control interface of a system for controlling the rotational speed of a boiling pump according to some embodiments of the present application;

4 is a structural block diagram of a system for controlling the rotational speed of a boiling pump according to some embodiments of the present application.

Detailed ways

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

In the present invention, unless otherwise stated, the use of directional words such as "upper, lower" generally refers to the change from high to low in space.

Fig. 1 is a flow chart of a method for controlling the rotational speed of the boiling pump according to the present application. As shown in Fig. 1, the method for controlling the rotational speed of the boiling pump comprises: S110, the controller monitors the material level of the bed through monitoring equipment; and S120, According to the working mode of the boiling pump and the comparison result between the detection value of the material level height monitoring point and the preset value, the controller adjusts the rotation speed of the boiling pump.

According to some embodiments of the present application, the material level of the bed is adjusted by changing the rotational speed of the boiling pump, and the preset value may be a point value or an interval value.

FIG. 2 is a schematic diagram of the material level of the reactor bed according to some embodiments of the present application. As shown in FIG. 2 , the monitoring equipment for the material level of the bed layer is a nuclear level meter (not shown in the figure), wherein the nuclear material The nuclear source of the level meter is inside the reactor, the detection device of the nuclear level meter is outside the reactor, and the nuclear level meter is used for fixed-point monitoring and alarm control of the material level and liquid level in the industrial production process. In this example, the core control point of the boiling pump rotation speed is divided into 5 points, which are points B, C, D, E and F of the reactor nuclear level meter respectively, and the B point of the nuclear level meter is defined as the reactor Material level high alarm point; define point C of the nuclear material level meter as the high alarm point of the reactor material level; define point D of the nuclear material level meter as the normal control point of the reactor material level; The point is defined as the low alarm point of the reactor material level; the F point of the nuclear material level meter is defined as the low and low alarm point of the reactor material level. The instrument number of the instrument, among which DI0001B, DI0001C, DI0001D, DI0001E and DI0001F respectively represent the monitoring points B, C, D, E and F set for monitoring the height of the ebullated bed inside the reactor. The actual height of the material level of the bed can be determined according to the monitoring value of the monitoring point.

As shown in Figure 2, there are 4 areas in the core control area of the boiling pump rotation speed: area 1 between points B and C on the nuclear level meter, area 2 between points C and D on the nuclear level meter, Zone 3 between points D and E of the level gauge, zone 4 between points E and F of the nuclear gauge. If the material level of the reactor bed reaches zone 1, it indicates that the material level of the reactor is high; if the material level of the reactor bed reaches zone 4, it indicates that the material level of the reactor is low, that is, zones 1 and 4 are abnormal for the reactor material level. The control zone, zone 2 and zone 3 are normal control zones for the material level of the reactor. The position greater than zone 1 is prone to production accidents, and the position lower than zone 4 stops the automatic adjustment of the boiling pump.

According to some embodiments of the present application, the controller may trigger a corresponding alarm signal according to the working mode of the boiling pump and the detection value of the material level monitoring point. Wherein, the working mode includes at least one of the following: automatic mode, semi-automatic mode, manual mode and failure mode. The alarm signal includes at least one of the following: a high material level alarm signal corresponding to point B, a high material level alarm signal corresponding to point C, a normal material level alarm signal corresponding to point D, and a low material level corresponding to point E Alarm signal and material level low alarm signal corresponding to point F.

As shown in Figure 2, the high material level alarm signal corresponding to point B belongs to the high material level alarm in zone 1, the high material level alarm signal corresponding to point C belongs to the high material level alarm signal in zone 2, and the normal material level corresponding to point D The alarm signal belongs to the low material level alarm in zone 2, the low material level alarm signal corresponding to point E belongs to the low material level alarm in zone 3, and the low material level alarm signal corresponding to point F belongs to the low material level alarm in zone 4. In practical applications, it can be set that when the monitoring value of point B reaches a fixed percentage of the preset value, such as 80% or 90%, that is, when the bed material level has not completely reached point B, the alarm signal of point B will be triggered. In order to increase the safety of the reactor during use.

It should be noted that in actual production, the number of reactors may be one or more, and the setting method of the core control point of each reactor is the same as that in this embodiment, for example, in FIG. 2 Shown is the distribution of core control points for either reactor.

The application triggers the adjustment of the rotational speed of the boiling pump by monitoring the material level of the bed, so that the height of the material level of the catalyst bed of the reactor can be adjusted in time, effectively controlling the material level of the catalyst bed in a safe area, and reducing the boiling Possibility of damage to equipment such as pumps.

FIG. 3 is a schematic diagram of a control interface of a system for controlling the rotational speed of a boiling pump according to some embodiments of the present application. As shown in FIG. 3 , the rotational speed of the boiling pump is divided into four working modes: automatic, semi-automatic, manual, and failure. The manual three working modes can be switched through the control interface at the operation mode on the interface.

As shown in Figure 3, the triggering standards of the high alarm point and the low alarm point of the boiling pump are different under different working conditions. Table 1 shows the triggering standards of the alarm points under several common working conditions. In the interface of alarm point setting, the alarm standard of point B, point C, point D, point E and point F can be set uniformly, and the range of alarm upper limit setting of the alarm value of each monitoring point shown in Figure 3 It is 500kg/m ³ -1300kg/m ³ , preferably 950kg/m ³ , the lower limit is set in the range of 450kg/m ³ -1250kg/m ³ , preferably 900kg/m ³ , DI0001B, DI0001C, DI0001D and DI0001E It is the display value of the monitoring value for point B, point C, point D, point E and point F on the control interface. The upper limit value and lower limit value of the alarm point can be set separately in the alarm point setting column. The set value is set according to the recommended values of the medium diesel oil, wax oil and residual oil. The recommended settings for the above three working conditions are The range of values is shown in Table 1.

Table 1

According to some embodiments of the present application, with the boiling pump in automatic mode, one or more of the following operations are performed:

If the material level reaches point B from bottom to top, control the boiling pump to slow down at a rate of 1-12r/s for a duration of 50-70s.

If the material level is high and reaches point C from bottom to top, control the boiling pump to slow down at a rate of 1-12r/min for a duration of 1-4min.

If the material level reaches point E from top to bottom, control the boiling pump to speed up at a rate of 1-5r/min, and the duration is 1-6min.

If the height of the material level is less than or equal to the height of point F, stop the automatic adjustment of the boiling pump.

Shown in table 2 is a preferred embodiment of the application in automatic mode, in table 2:

Table 2

1. When the material level of the reactor reaches the alarm point B from bottom to top, the material level high alarm is triggered, and the speed of the boiling pump executes the action: the speed is reduced by 10 rpm in 1 second for 1 minute, that is, 600 rpm in 1 minute.

2. When the material level of the reactor reaches the alarm point C from bottom to top, the material level high alarm is triggered, and the speed of the boiling pump executes the action: the speed is reduced by 10 revolutions in 1 minute for 3 minutes, that is, it is reduced by 30 revolutions in 3 minutes.

3. When the material level of the reactor reaches point D, which is the normal material level control point, the normal material level alarm is triggered, and the boiling pump speed does not perform any action.

4. When the material level of the reactor reaches the alarm point E from top to bottom, the low material level alarm is triggered, and the speed of the boiling pump is executed: the speed is increased by 2 revolutions in 1 minute for 5 minutes, that is, 10 revolutions in 5 minutes.

5. When the material level of the reactor reaches the alarm point of F point from top to bottom, the low and low material level alarm is triggered, and the boiling pump speed does not perform any action, and the operator needs to intervene and adjust.

In the above embodiment, the alarm point of point B belongs to the range of high alarm in zone 1, the alarm point of point C belongs to the range of high alarm of zone 2, the alarm point of point D belongs to the scope of low alarm of zone 2, and the alarm point of point E belongs to the range of zone 3 In the range of low report, the alarm point of F point belongs to the range of low report in Zone 4.

According to some embodiments of the present application, with the boiling pump in a semi-automatic mode, one or more of the following operations are performed:

When the material level reaches point B from bottom to top, after receiving the confirmation information, control the boiling pump to slow down at a rate of 1-12r/s for a duration of 50-70s.

When the material level reaches point C from bottom to top, after receiving the confirmation information, control the boiling pump to decelerate at a rate of 1-12r/min for a duration of 1-4min.

When the material level reaches point E from top to bottom, stop the automatic adjustment of the boiling pump.

Table 3 shows a preferred embodiment of the application in the semi-automatic mode, in Table 3:

table 3

1. When the material level of the reactor is in the normal control zone 2 and 3, that is, between point C and point E, the operator can adjust the speed of the boiling pump. It can be adjusted to raise or lower 180 revolutions in 1 minute.

2. When the material level of the reactor reaches the alarm point E from top to bottom, the low material level alarm is triggered, and the boiling pump speed does not perform any action. The operator needs to adjust the boiling pump speed, and the speed adjustment rate is not limited.

3. When the material level of the reactor reaches the alarm point C from bottom to top, the high material level alarm is triggered, and the speed of the boiling pump is executed: the speed is reduced by 10 revolutions in 1 minute for 3 minutes, that is, it is reduced by 30 revolutions in 3 minutes. However, the execution of the action needs to be confirmed by the operator.

4. When the material level of the reactor reaches the alarm point B from bottom to top, the material level high alarm is triggered, and the speed of the boiling pump executes the action: the speed is reduced by 10 revolutions per second for one minute, that is, it is reduced by 600 revolutions in one minute. However, the execution of the action needs to be confirmed by the operator.

In the above embodiment, the alarm point of point B is included in the range of high alarm in zone 1, the alarm point of point C is included in the range of high alarm in zone 2, and the alarm point of point E is included in the range of low alarm in zone 3. According to some embodiments of the present application, when the boiling pump is in automatic or semi-automatic mode and the following triggering conditions are met, the boiling pump is controlled to switch to the failure mode:

The altitude alarm signal at point C is triggered, but the altitude alarm signal at point D is not triggered; or

The altitude warning signal at point B is triggered, but the altitude warning signal at point C and/or the altitude warning signal at point D is not triggered.

When the boiling pump is in failure mode, do the following:

Control the boiling pump to perform the following adjustments at least once: drop the first revolution and stop for the third time. Switch to manual mode. Wherein, the occurrence time of decreasing the first rotation number is in milliseconds.

When the failure mode is not triggered, the conditions for normal operation are as follows:

1. The monitoring value of point C > the set high alarm value AND the monitoring value of point D < the low alarm value set, that is, if the high alarm at point C is triggered, then the low alarm at point D must be triggered, that is, there is a catalyst at point C, D There must be a catalyst at the point;

2. The monitoring value of point B > the set high alarm value AND the monitoring value of point D < the low alarm value set, that is, if the high alarm at point B is triggered, then the low alarm at point D must be triggered, that is, there is a catalyst at point B, D There must be a catalyst at the point;

3. The monitoring value of point B > the set high alarm value AND the monitoring value of point C < the low alarm value set, that is, if the high alarm at point B is triggered, then the high alarm at point C must be triggered, that is, there is a catalyst at point B, C There must be a catalyst.

According to a specific embodiment of the present application, when any of the above conditions cannot be established, it means that the monitoring equipment may be faulty, and the monitoring result does not match the actual height of the bed material level. In order to prevent the material level from being too high, the If the boiling pump and other equipment are damaged, at this time the boiling pump enters the failure mode, and the speed of the boiling pump executes the action: immediately drop 100r at the speed of milliseconds, stop for 1min interval, drop 100r again, and then stop for 1min interval, during which it can be manually switched to manual If the action is not manually switched to the manual mode during the execution of the action, the boiling pump speed control mode will be automatically switched to the manual mode after the action is executed. In the manual mode, the boiling pump can be manually adjusted according to the parameters shown in Figure 3.

Fig. 4 is a system for controlling the rotational speed of the boiling pump according to an embodiment of the present application, the material level height of the bed is adjusted by changing the rotational speed of the boiling pump, and the system includes a monitoring device for obtaining the material level height of the bed; and The controller is used to adjust the rotational speed of the boiling pump according to the working mode and the material level height of the boiling pump.

The application triggers the change of the speed of the boiling pump by monitoring the alarm point set on the equipment, effectively controls the material level of the catalyst bed to a safe area, can adjust the material level of the catalyst bed of the reactor in time, and reduces the possibility of damage to the boiling pump and other equipment. , reducing production safety accidents and reducing the waste of human resources.

The preferred embodiments of the present invention have been described above in detail with reference to the accompanying drawings, however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and each specific technical feature can be combined in any suitable manner. No further explanation is required. However, these simple modifications and combinations should also be regarded as the contents disclosed in the present invention, and all belong to the protection scope of the present invention.

Claims (10)

1. a method for controlling the rotating speed of the boiling pump, wherein, the change of the rotating speed of the boiling pump is used to adjust the material level of the reactor bed, it is characterized in that, the method comprises: monitoring the level of the bed; and According to the working mode of the boiling pump and the comparison result of the monitoring value of the material level monitoring point and the preset value, the rotation speed of the boiling pump is adjusted. 2. The method for controlling the rotational speed of a boiling pump according to claim 1, wherein the material level monitoring point comprises at least one of the following arranged in order from top to bottom: point B, point C, point D, point E and point F; The operating modes include at least one of the following: automatic mode, semi-automatic mode, manual mode and failure mode. 3. The method for controlling the rotational speed of a boiling pump according to claim 2, wherein, when the boiling pump is in an automatic mode, one or more of the following operations are performed: When the monitoring value at point B is greater than or equal to a preset value, control the boiling pump to slow down at a first rate for a first time, so as to reduce the material level of the bed; When the monitored value at point C is greater than or equal to a preset value, control the boiling pump to decelerate at a second rate for a second time, so as to reduce the material level of the bed; When the monitoring value of point E is less than or equal to the preset value, controlling the boiling pump to increase the speed at a third rate for a third time, so as to increase the material level of the bed; When the monitoring value of point F is less than or equal to the preset value, stop adjusting the boiling pump; Wherein, the first rate is greater than or equal to the second rate, and the first time is less than or equal to the second time. 4. The method for controlling the rotational speed of a boiling pump according to claim 2, wherein, when the boiling pump is in a semi-automatic mode, one or more of the following operations are performed: When the monitoring value at point B is greater than or equal to the preset value, after receiving the confirmation information, the boiling pump is controlled to decelerate at a first rate for a first time, so as to reduce the material level of the bed. When the monitoring value of point C is greater than or equal to the preset value, after receiving the confirmation information, control the boiling pump to decelerate at a second rate for a second time, so as to reduce the material level of the bed; When the monitoring value at point E is less than or equal to the preset value, stop adjusting the boiling pump. Wherein, the first rate is greater than or equal to the second rate, and the first time is less than or equal to the second time. 5. The method for controlling the rotational speed of a boiling pump according to claim 2, wherein the method further comprises: According to the working mode of the boiling pump and the detection value of the material level monitoring point, a corresponding alarm signal is triggered. 6 . The method for controlling the rotational speed of a boiling pump according to claim 5 , wherein the alarm signal comprises at least one of the following: a material level high alarm signal corresponding to the B point, a material level high alarm signal corresponding to the C point, 6 . The material level high alarm signal corresponding to the D point, the normal material level alarm signal corresponding to the D point, the material level low alarm signal corresponding to the E point, and the material level low alarm signal corresponding to the F point. 7. The method for controlling the rotational speed of the boiling pump according to claim 6, characterized in that, When the boiling pump is in automatic or semi-automatic mode and the following triggering conditions are met, the boiling pump is controlled to switch to a failure mode: The alarm signal at point C is triggered, but the alarm signal at point D is not triggered; or The B point alarm signal is triggered, but the C point alarm signal and/or the D point alarm signal is not triggered. 8. The method for controlling the rotational speed of the boiling pump according to claim 7, characterized in that, When the boiling pump is in failure mode, do the following: Controlling the boiling pump to perform at least one adjustment of: dropping a first number of revolutions, stopping a third time interval; and Switch to manual mode. 9. A system for controlling the rotational speed of a boiling pump, wherein the change in the rotational speed of the boiling pump is used to adjust the material level of the reactor bed, wherein the system comprises: monitoring equipment for obtaining the level of the bed; and The controller is configured to execute the method for controlling the rotational speed of the boiling pump described in any one of 1-8. 10. The system for controlling the rotational speed of the boiling pump according to claim 9, wherein, The monitoring equipment includes a nuclear level meter.

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