CN113266817A - Method for preventing and controlling overtemperature of superheater tube wall - Google Patents
Method for preventing and controlling overtemperature of superheater tube wall Download PDFInfo
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- CN113266817A CN113266817A CN202110572701.2A CN202110572701A CN113266817A CN 113266817 A CN113266817 A CN 113266817A CN 202110572701 A CN202110572701 A CN 202110572701A CN 113266817 A CN113266817 A CN 113266817A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
- F22G5/123—Water injection apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/20—Controlling superheat temperature by combined controlling procedures
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Abstract
本发明公开了一种过热器管壁超温的防控方法，涉及过热器技术领域，具体为S1、减温水控制逻辑和S2、减温水控制分量投入/复位逻辑。该一种过热器管壁超温的防控方法，引入屏式过热器壁温作为一级减温水的前馈信号，引入高温过热器壁温作为二级减温水的前馈信号，在汽温超温且变化升温速率过快时，减温水控制分量能及时投入并保持，从而有利于及时应对快速变负荷时温度的快速升高，而且当汽温开始下降或升温速率低于门槛值时，减温水控制分量不会立即退出，二者之间存在切换差值区域，可以有效减少减温水阀门动作次数，延长设备寿命，并且减温水的退出条件与投入条件存在差异，可以更有效控制减温水流量。
The invention discloses a method for preventing and controlling overtemperature of a superheater tube wall, which relates to the technical field of superheaters, and specifically includes S1, desuperheating water control logic and S2, desuperheating water control component input/reset logic. The method for preventing and controlling the over-temperature of the superheater tube wall is to introduce the wall temperature of the screen superheater as the feedforward signal of the primary desuperheating water, and the wall temperature of the high temperature superheater as the feedforward signal of the secondary desuperheating water. When the temperature is too high and the heating rate changes too fast, the control component of the desuperheating water can be input and maintained in time, which is conducive to timely response to the rapid temperature rise when the load changes rapidly, and when the steam temperature begins to drop or the heating rate is lower than the threshold value, The control component of the desuperheating water will not exit immediately, and there is a switching difference area between the two, which can effectively reduce the number of actions of the desuperheating water valve and prolong the life of the equipment, and the withdrawal conditions of the desuperheating water are different from the input conditions, which can control the desuperheating water more effectively. flow.
Description
Technical Field
The invention relates to the technical field of superheaters, in particular to a method for preventing and controlling overtemperature of a superheater tube wall.
Background
The superheater steam temperature control is an important component of a thermal power generation control system and plays an important role in the safe and economic operation of the thermal control system, in order to improve the comprehensive frequency modulation performance of the unit, an advanced control strategy is adopted in a plug-in system mode, the original AGC system, the coordination control system, the fuel control system, the primary superheated steam temperature control system, the secondary superheated steam temperature control system and the like of the unit are subjected to frequency modulation transformation, the high requirement of the frequency modulation transformation of the superheater leads the overheating of the heating surface of the boiler to frequently occur in the running process, the overheating increases the thermal stress borne by the heating surface, and the fatigue loss of the heating surface is increased by frequent overtemperature, the service life of the heating surface is seriously influenced, the heating surface is exploded due to long-time overtemperature, and the safe operation of a unit is threatened, so that a steam temperature control system is needed to adjust the pipe wall temperature, and the overtemperature of the pipe wall of the superheater is prevented.
The closed-loop control system adopted by the existing steam temperature control system unit under the normal working condition has the following defects: the overtemperature loop of the wall of the superheater has slow response and low regulation rate, and cannot cope with rapid temperature rise under rapid variable load; the control loop desuperheating water has low control precision and no accurate switching and maintaining logic, so that the problems of frequent switching of a valve and reduction of the service life of equipment are caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for preventing and controlling the overtemperature of the pipe wall of a superheater, which solves the problems that the prior closed-loop control system adopted by a steam temperature control system unit under the normal working condition in the background art has the following defects: the overtemperature loop of the wall of the superheater has slow response and low regulation rate, and cannot cope with rapid temperature rise under rapid variable load; the control loop desuperheating water has low control precision and no accurate switching and maintaining logic, so that the problems of frequent switching of a valve and reduction of the service life of equipment are caused.
In order to achieve the purpose, the invention is realized by the following technical scheme: a method for preventing and controlling overtemperature of a superheater tube wall comprises the following operation steps:
s1, temperature-reducing water control logic:
(1) and adding temperature-reducing water:
after the temperature-reducing water is put into the water tank and is controlled first, the PLC takes over the control logic of the relevant loop;
(2) and the feed forward amount of the screen through outlet is obtained:
after the temperature of the screen outlet is subjected to lead/lag treatment and is higher than the load-temperature curve value, the temperature is converted into desuperheating water in proportion, and the desuperheating water is summed with other components after passing through an inertia link to serve as the feed-forward quantity of the first-stage desuperheating water; when the temperature of the screen outlet is higher than the load-temperature curve value, the pipe wall of the screen superheater is over-heated, and the first-stage desuperheating water is locked and reduced;
(3) and the feed forward amount higher than the outlet is obtained:
after the temperature higher than the outlet temperature is subjected to lead/lag treatment and is higher than the load-temperature curve value, the temperature is converted into desuperheating water in proportion, and the desuperheating water is summed with other components after passing through an inertia link to serve as the feedforward quantity of the secondary desuperheating water; when the temperature of the super-outlet is higher than the load-temperature curve value, the pipe wall of the high-temperature superheater is over-heated, and the secondary desuperheating water is locked and reduced;
s2, temperature reduction water control component input/reset logic:
(4) obtaining a load-temperature curve:
obtaining a load-temperature curve from operation experience;
(5) and input logic of the desuperheating water:
when the steam temperature measurement value is higher than the load temperature curve, adding the desuperheating water to control the component and keeping;
(6) reset logic of the desuperheating water:
and when the steam temperature measured value is lower than the load temperature curve, resetting the temperature-reducing water control component.
Optionally, in the step (1), the PLC is a control center, and the PLC has an effect of controlling opening and closing of an internal channel of the superheater pipeline, that is, has a function of changing a path of the desuperheating water.
Optionally, in the step (1), the desuperheating water must be pure water after softening treatment, and the input amount of the desuperheating water is controlled by a PLC.
Optionally, in the step (2) and the step (3), "the load-temperature curve value" in "when the shield outlet temperature is higher than the load-temperature curve value" and "when the shield outlet temperature is higher than the load-temperature curve value" is a temperature curve value in a normal condition when the device is in operation.
Optionally, in the step (4), the operation experience refers to that the operation efficiency, time and temperature data of the equipment during operation are recorded, and a load-temperature curve is drawn according to the data.
Optionally, in the step (4), the load-temperature curve is a temperature value generated by the device under different working efficiency and time.
Optionally, in the step (5), "when the measured steam temperature is higher than the load temperature curve" is when the measured steam temperature is higher than the load temperature curve by 5 ℃ and the temperature rises/falls by more than 0.8 ℃ within 30 s.
Optionally, in step (6), "when the measured steam temperature value is lower than the load temperature curve" is when the measured steam temperature value is lower than the load temperature curve or the temperature drops/rises by more than 0.5 ℃ within 30 s.
The invention provides a method for preventing and controlling overtemperature of the wall of a superheater tube, which has the following beneficial effects:
the wall temperature of the screen superheater is introduced to serve as a feedforward signal of first-stage desuperheating water, the wall temperature of the high-temperature superheater is introduced to serve as a feedforward signal of second-stage desuperheating water, when the steam temperature is over-high and the temperature rise rate is too high, the desuperheating water control component can be timely put into and kept, so that the rapid temperature rise during rapid variable load can be timely responded, when the steam temperature begins to fall or the temperature rise rate is lower than a threshold value, the desuperheating water control component cannot be immediately withdrawn, a switching difference value area exists between the steam temperature and the desuperheating water, the number of times of actions of a desuperheating water valve can be effectively reduced, the service life of equipment is prolonged, the withdrawal condition and the input condition of the desuperheating water are different, and the flow rate can be more effectively controlled.
Drawings
FIG. 1 is a schematic diagram of the over-screen/over-screen desuperheating water control logic of the present invention;
FIG. 2 is a schematic diagram of the desuperheating water control component input/reset logic of the present invention.
Detailed Description
Referring to fig. 1 to 2, the present invention provides a technical solution: a method for preventing and controlling overtemperature of a superheater tube wall comprises the following operation steps:
s1, temperature-reducing water control logic:
(1) and adding temperature-reducing water: after the temperature-reducing water is put into the water tank and is controlled first, the PLC takes over the control logic of the relevant loop;
(2) and the feed forward amount of the screen through outlet is obtained: after the temperature of the screen outlet is subjected to lead/lag treatment and is higher than the load-temperature curve value, the temperature is converted into desuperheating water in proportion, and the desuperheating water is summed with other components after passing through an inertia link to serve as the feed-forward quantity of the first-stage desuperheating water; when the temperature of the screen outlet is higher than the load-temperature curve value, the pipe wall of the screen superheater is over-heated, and the first-stage desuperheating water is locked and reduced;
(3) and the feed forward amount higher than the outlet is obtained: after the temperature higher than the outlet temperature is subjected to lead/lag treatment and is higher than the load-temperature curve value, the temperature is converted into desuperheating water in proportion, and the desuperheating water is summed with other components after passing through an inertia link to serve as the feedforward quantity of the secondary desuperheating water; when the temperature of the super-outlet is higher than the load-temperature curve value, the pipe wall of the high-temperature superheater is over-heated, and the secondary desuperheating water is locked and reduced;
s2, temperature reduction water control component input/reset logic:
(4) obtaining a load-temperature curve: obtaining a load-temperature curve from operation experience;
(5) and input logic of the desuperheating water: when the steam temperature measurement value is higher than the load temperature curve, adding the desuperheating water to control the component and keeping;
(6) reset logic of the desuperheating water: and when the steam temperature measured value is lower than the load temperature curve, resetting the temperature-reducing water control component.
In the step (1), the PLC is a control center, and the PLC has the function of controlling the opening and closing of the internal channel of the superheater pipeline, namely has the function of changing the path of the desuperheating water.
In the step (1), the desuperheating water is pure water after softening treatment, and the input amount of the desuperheating water is controlled by a PLC.
In the step (2) and the step (3), "load-temperature curve value" in "when the screen outlet temperature is higher than the load-temperature curve value" and "when the screen outlet temperature is higher than the load-temperature curve value" is a temperature curve value in a normal condition when the equipment is in operation.
In the step (4), the operation experience means that a load-temperature curve is drawn according to the data by recording the operation efficiency, time and temperature data of the equipment during operation.
In the step (4), the load-temperature curve is the temperature value generated by the equipment under different working efficiency and time.
In the step (5), "when the measured value of the steam temperature is higher than the load temperature curve" means when the measured value of the steam temperature is higher than the load temperature curve by 5 ℃ and the temperature rises/falls by more than 0.8 ℃ within 30 s.
In the step (6), "when the measured value of the steam temperature is lower than the load temperature curve" means when the measured value of the steam temperature is lower than the load temperature curve or the temperature falls/rises by more than 0.5 ℃ within 30 s;
the invention provides a method for preventing and controlling overtemperature of the wall of a superheater tube, which has the following beneficial effects:
the wall temperature of the screen superheater is introduced to serve as a feedforward signal of first-stage desuperheating water, the wall temperature of the high-temperature superheater is introduced to serve as a feedforward signal of second-stage desuperheating water, when the steam temperature is over-high and the temperature rise rate is too high, the desuperheating water control component can be timely put into and kept, so that the rapid temperature rise during rapid variable load can be timely responded, when the steam temperature begins to fall or the temperature rise rate is lower than a threshold value, the desuperheating water control component cannot be immediately withdrawn, a switching difference value area exists between the steam temperature and the desuperheating water, the number of times of actions of a desuperheating water valve can be effectively reduced, the service life of equipment is prolonged, the withdrawal condition and the input condition of the desuperheating water are different, and the flow rate can be more effectively controlled.
In summary, the method for preventing and controlling the overtemperature of the wall of the superheater tube comprises the following operation steps:
obtaining a load-temperature curve: obtaining a load-temperature curve from operation experience;
adding temperature-reducing water: after the temperature-reducing water is put into the water tank and is controlled first, the PLC takes over the control logic of the relevant loop;
the amount of feed forward through the screen exit is obtained: after the temperature of the screen outlet is subjected to lead/lag treatment and is higher than the load-temperature curve value, the temperature is converted into desuperheating water in proportion, and the desuperheating water is summed with other components after passing through an inertia link to serve as the feed-forward quantity of the first-stage desuperheating water; when the temperature of the screen outlet is higher than the load-temperature curve value, the pipe wall of the screen superheater is over-heated, and the first-stage desuperheating water is locked and reduced;
the feed forward amount above the outlet is obtained: after the temperature higher than the outlet temperature is subjected to lead/lag treatment and is higher than the load-temperature curve value, the temperature is converted into desuperheating water in proportion, and the desuperheating water is summed with other components after passing through an inertia link to serve as the feedforward quantity of the secondary desuperheating water; when the temperature of the super-outlet is higher than the load-temperature curve value, the pipe wall of the high-temperature superheater is over-heated, and the secondary desuperheating water is locked and reduced;
input logic of desuperheating water: when the measured value of the steam temperature is higher than the load temperature curve, namely when the measured value of the steam temperature is higher than the load temperature curve by 5 ℃ and the temperature rises/falls within 30s and exceeds 0.8 ℃, putting in the desuperheating water control component and keeping;
reset logic of desuperheating water: when the measured value of the steam temperature is lower than the load temperature curve, namely when the measured value of the steam temperature is lower than the load temperature curve or the temperature falls/rises within 30s and exceeds 0.5 ℃, resetting the temperature-reducing water control component;
the invention provides a method for preventing and controlling overtemperature of the wall of a superheater tube, which has the following beneficial effects:
the wall temperature of the screen superheater is introduced to serve as a feedforward signal of first-stage desuperheating water, the wall temperature of the high-temperature superheater is introduced to serve as a feedforward signal of second-stage desuperheating water, when the steam temperature is over-high and the temperature rise rate is too high, the desuperheating water control component can be timely put into and kept, so that the rapid temperature rise during rapid variable load can be timely responded, when the steam temperature begins to fall or the temperature rise rate is lower than a threshold value, the desuperheating water control component cannot be immediately withdrawn, a switching difference value area exists between the steam temperature and the desuperheating water, the number of times of actions of a desuperheating water valve can be effectively reduced, the service life of equipment is prolonged, the withdrawal condition and the input condition of the desuperheating water are different, and the flow rate can be more effectively controlled.
Claims (8)
1. A method for preventing and controlling overtemperature of the wall of a superheater tube is characterized by comprising the following operation steps:
s1, temperature-reducing water control logic:
(1) and adding temperature-reducing water:
after the temperature-reducing water is put into the water tank and is controlled first, the PLC takes over the control logic of the relevant loop;
(2) and the feed forward amount of the screen through outlet is obtained:
after the temperature of the screen outlet is subjected to lead/lag treatment and is higher than the load-temperature curve value, the temperature is converted into desuperheating water in proportion, and the desuperheating water is summed with other components after passing through an inertia link to serve as the feed-forward quantity of the first-stage desuperheating water; when the temperature of the screen outlet is higher than the load-temperature curve value, the pipe wall of the screen superheater is over-heated, and the first-stage desuperheating water is locked and reduced;
(3) and the feed forward amount higher than the outlet is obtained:
after the temperature higher than the outlet temperature is subjected to lead/lag treatment and is higher than the load-temperature curve value, the temperature is converted into desuperheating water in proportion, and the desuperheating water is summed with other components after passing through an inertia link to serve as the feedforward quantity of the secondary desuperheating water; when the temperature of the super-outlet is higher than the load-temperature curve value, the pipe wall of the high-temperature superheater is over-heated, and the secondary desuperheating water is locked and reduced;
s2, temperature reduction water control component input/reset logic:
(4) obtaining a load-temperature curve:
obtaining a load-temperature curve from operation experience;
(5) and input logic of the desuperheating water:
when the steam temperature measurement value is higher than the load temperature curve, adding the desuperheating water to control the component and keeping;
(6) reset logic of the desuperheating water:
and when the steam temperature measured value is lower than the load temperature curve, resetting the temperature-reducing water control component.
2. The method for preventing and controlling the overtemperature of the superheater tube wall as claimed in claim 1, wherein in the step (1), the PLC is a control center, and the PLC has a function of controlling the opening and closing of the internal channel of the superheater tube, that is, a function of changing the path of the desuperheating water.
3. The method for preventing and controlling the overtemperature of the wall of the superheater tube according to claim 1, wherein in the step (1), the desuperheating water is pure water after softening treatment, and the input amount of the desuperheating water is controlled by a PLC.
4. The method for preventing and controlling the overtemperature of the superheater tube wall according to claim 1, wherein in the step (2) and the step (3), the load-temperature curve value in the cases that the shielding outlet temperature is higher than the load-temperature curve value and the shielding outlet temperature is higher than the load-temperature curve value is the temperature curve value under the normal condition when the equipment runs.
5. The method for preventing and controlling the overtemperature of the superheater tube wall as recited in claim 1, wherein in the step (4), the operation experience is obtained by recording operation efficiency, time and temperature data of the equipment during operation and drawing a load-temperature curve according to the data.
6. The method for preventing and controlling the overtemperature of the superheater tube wall as recited in claim 1, wherein in the step (4), the load-temperature curve is the temperature value generated by the equipment under different working efficiency and time.
7. The method for preventing and controlling the overtemperature of the superheater tube wall as recited in claim 1, wherein in the step (5), "when the measured steam temperature value is higher than the load temperature curve" is that when the measured steam temperature value is higher than the load temperature curve by 5 ℃ and the temperature rises/falls by more than 0.8 ℃ within 30 s.
8. The method for preventing and controlling the overtemperature of the wall of the superheater tube as recited in claim 1, wherein in the step (6), "when the measured steam temperature value is lower than the load temperature curve" is that when the measured steam temperature value is lower than the load temperature curve or the temperature drops/rises by more than 0.5 ℃ within 30 s.
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Application publication date: 20210817 Assignee: Huaneng Yangpu Thermal Power Co.,Ltd. Assignor: Huaneng Dongguan gas turbine thermal power Co.,Ltd. Contract record no.: X2025980035786 Denomination of invention: A prevention and control method for overheating of superheater tube walls Granted publication date: 20220805 License type: Common License Record date: 20251119 Application publication date: 20210817 Assignee: Huaneng Henan Zhongyuan Gas Power Generation Co.,Ltd. Assignor: Huaneng Dongguan gas turbine thermal power Co.,Ltd. Contract record no.: X2025980035787 Denomination of invention: A prevention and control method for overheating of superheater tube walls Granted publication date: 20220805 License type: Common License Record date: 20251119 |
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