CN111396855A - Grading control and operation method for power station unit No. 0 high under multi-working-condition operation - Google Patents
Grading control and operation method for power station unit No. 0 high under multi-working-condition operation Download PDFInfo
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- CN111396855A CN111396855A CN202010302169.8A CN202010302169A CN111396855A CN 111396855 A CN111396855 A CN 111396855A CN 202010302169 A CN202010302169 A CN 202010302169A CN 111396855 A CN111396855 A CN 111396855A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
- F22D1/325—Schematic arrangements or control devices therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
Abstract
A classification control and operation method of a power station unit with a 0-size height under multi-working-condition operation comprises the following steps; (1) defining a control target of 0 # high plus; (2) performing modular division on the multiple working conditions of the number 0 high pressure operation; (3) the control process is divided into three-level control, the method can adapt to full-automatic operation under multiple working conditions of a 0-size high-pressure air compressor unit, and simultaneously, the multiple working conditions in the operation of the unit are modularly distinguished, so that the purposes of graded response and accurate control are achieved, the regulated quantity can operate in an optimal interval, early warning, accurate warning and quick response can be realized in the face of abnormal working conditions, and the overall economy and safety of the unit are obviously improved.
Description
Technical Field
The invention relates to the technical field of large-scale thermal generator sets, in particular to a grading control and operation method of a power station unit with the number 0 higher under multi-working-condition operation.
Background
The 0 # high-voltage capacitor is used as the conventional configuration of the current large-scale ultra-supercritical thermal power generating unit, and has obvious effect on realizing high-efficiency wide load and responding to quick load change of the unit. The addition of the No. 0 high heater can effectively improve the water supply temperature of the thermal power generating unit under low load, so that the water supply temperature is close to the optimal water supply temperature, the smoke temperature at the outlet of the boiler is further improved, the operation of denitration equipment is ensured as early as possible, and the operation economy of the thermal power generating unit under low load is improved as a whole. Meanwhile, the unit can be assisted to quickly change the load by adjusting the No. 0 high steam inlet quantity or the water inlet flow.
In the ultra-supercritical steam turbine manufactured by the introduction of siemens technology by the above sea steam turbine plant ltd, the high-pressure cylinder is generally provided with a steam supply valve. The conventional No. 0 high pressure steam side extraction is extracted from 5 stages of the high pressure cylinder, and the No. 0 high pressure extraction with a steam supplement valve can also be led out from the steam supplement valve. The steam source of the steam supplementing valve comes from the high-pressure main steam, and after the steam supplementing valve is opened, the steam directly enters the 5-stage high-pressure cylinder and then works.
At present, different methods appear in different factories for the control of the 0 # high pressure steam side, and no definite control target exists. The pressure after the steam inlet regulating valve is controlled to be higher than the pressure after the steam inlet regulating valve is controlled singly is taken as a main part, the temperature of the water after the steam inlet regulating valve is controlled to be higher than the pressure after the steam inlet regulating valve is controlled to.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a hierarchical control and operation method of a power station unit with a height of 0 and under multi-working-condition operation, the method can adapt to full-automatic operation of the unit with the height of 0 and under the multi-working-condition operation, and simultaneously modularly distinguishes the multi-working-condition operation of the unit to achieve the purposes of hierarchical response and accurate control, so that the regulated quantity can operate in an optimal interval, and meanwhile, early warning, accurate warning and quick response can be realized in the face of abnormal working conditions, and the overall economy and safety of the unit are obviously improved.
A classification control method for a power station unit with a 0-size height under multi-working-condition operation comprises the following steps;
(1) defining a control target of 0 # high plus;
on the premise of ensuring that the temperature of the No. 0 high-pressure steam inlet and outlet water reaches the design value, the No. 0 high-pressure steam inlet regulating valve operates in an optimal interval of 25% -45%, and once abnormality occurs, the control strategy can early warn, accurately alarm and quickly respond in advance, so that the safety of a unit is ensured;
(2) performing modular division on the multiple working conditions of the number 0 high pressure operation;
according to the starting process of the unit, the multi-working-condition operation process is divided into four stages, and four switching modes are correspondingly adopted, namely a primary heating pipe switching mode A, a low-load operation mode B, an optimal load operation mode C and a high-load exit mode D;
(3) in order to realize the optimal control of the high plus of the number 0, early warning and quick response can be realized when the high plus of the number 0 is under an abnormal working condition, the control process is divided into three-stage control, and the control authority is gradually increased; namely, if the secondary control condition is triggered, the primary control is locked; and if the three-level control condition is triggered, directly limiting the first-level control and the second-level control.
The initial heating pipe mode A corresponds to a turbine constant speed of 3000r/min to a generator grid connection initial stage of 15% rated load (P)e) A stage;
the load of the corresponding unit in the low-load operation mode B reaches 15 percent PeTo 30% PeA stage;
the load of the corresponding unit in the optimal load mode C reaches 30 percent PeTo 75% PeA stage;
the load of the corresponding unit in the high-load exit mode D reaches 75 percent PeTo 95% PeAnd (5) stage.
The primary control is to automatically select the optimal control targets of different modes:
a. in the initial heating pipe feeding mode A, the optimal control target is the temperature rise rate, so that the situation that the temperature rise of a No. 0 high-pressure heating pipeline is too fast in the heating pipe stage is prevented, and meanwhile, the situation that the heating pipe time is too long is avoided;
b. in the low-load operation B mode, the optimal control target is the valve position of the 0-pumping pipeline, and the optimal valve characteristic is ensured to work;
c. in the optimal load operation C mode, the optimal control target is to control the water supply temperature of the 0 # high-pressure water supply outlet to be close to the design value as far as possible, and meanwhile, the optimal operation of the 0-pumping pipeline regulating valve in the range of 25% -45% in opening degree is guaranteed.
d. Under the high-load exit D mode, the optimal control target is to close the 0 pumping pipeline regulating valve according to the set rate, and exit the 0 # high plus.
The secondary control is inhibition adjustment:
a. in the mode of the initial heating pipe A, when the temperature rise rate reaches 2.5 ℃/min, the 0-pumping pipeline regulating valve is limited to be continuously opened; when the temperature rise rate does not reach 2.5 ℃/min, setting the upper limit of the 0-pumping pipeline regulating valve to be 8%, and limiting the regulating valve to be continuously opened in the pipe heating process;
b. in a low-load operation B mode, the valve position of the 0-pumping pipeline adjusting valve is controlled along with the load open loop, an upper limit and a lower limit are set, the upper limit is set to be 40%, the lower limit is set to be 25%, and the condition that the adjusting valve is too large or too small in opening degree is avoided;
c. in the optimal load operation C mode, setting the upper limit of the valve position of the 0-pumping pipeline adjusting valve to be 60 percent, and limiting the valve position to be continuously opened;
d. and in the high-load exit D mode, the closing speed of the 0-pump pipeline regulating valve is limited, and the regulating valve is prevented from closing too fast or too slow in the load section.
Under any of the above A, B, C, D four modes, if 0, the tube wall temperature t1Sending out overtemperature warning (more than 500 ℃) or sending out economizer vaporization warning (the judgment condition of the working condition is that the No. 0 high charging water supply side pressure p3Corresponding saturation temperature and 0 # higher outlet water temperature toutThe difference is less than 35 ℃), the first-stage control is directly cut off, namely the optimal target control is abandoned, the second-stage control is entered, and the inhibition is carried outThe current control strategy is to adjust the opening of the adjusting valve in the normal running direction of the protection equipment and the unit.
The three-level control is override control, the 0-stage pumping and regulating valve is immediately closed after the three-level control is triggered, the 0-grade Gaojia is cut off, and the three-level control is triggered under the following four conditions in total when the multi-working-condition full-automatic operation is carried out:
firstly, the steam compensating valve is opened because of participating in primary frequency modulation of the unit or because of sudden increase of total flow instructions under variable load working conditions, and the judgment standard that the valve position feedback of the steam compensating valve is more than 3 percent is taken as a judgment standard;
secondly, the overtemperature of the No. 0 high heating pipe wall is set to 510 ℃ to an alarm value due to the internal leakage of the steam supplementing valve;
thirdly, triggering 0 # high-plus override cutting under the high-plus splitting working condition;
fourthly, the economizer vaporizes and reports to the police, the judgement condition of this operating mode is: no. 0 high feed water side pressure p3Corresponding saturation temperature and 0 # higher outlet water temperature toutThe difference is less than 30 ℃.
A hierarchical control operation method for a power station unit with a 0-size high-load under multi-working-condition operation comprises the following steps:
a. when the unit is flushed to 3000r/min and the load does not reach 15% Pe, the initial heating pipe feeding mode A is started automatically, the control target is 0 temperature rise rate of the pumping pipeline, the temperature rise rate is required to be not more than 2.5 ℃/min under the mode A, the controlled object is the opening degree of a regulating valve of the pumping pipeline, the upper limit of the regulating valve in the mode is set to be 8%, the control process is open-loop control, the regulating valve is opened at a certain speed until the upper limit reaches 8% as long as the temperature rise rate is not over the limit, the fastest heating pipe rate is ensured, if the temperature rise rate in the opening process of the regulating valve is higher than 2.5 ℃/min, the temperature rise rate alarm in the secondary control is triggered, the regulating valve is limited to be continuously opened, and when the temperature t of the pumping1No. 0 high steam inlet pipeline temperature t2And the front drainage temperature t of the No. 0 high-pressure steam-inlet electric valve3When the temperature is higher than 180 ℃, judging that the initial heating pipe feeding mode A is finished, and after finishing, adjusting the valve to keep the current value;
b. when the load of the unit is more than 15% Pe and less than 30% Pe, automatically triggering a low-load operation mode B, wherein the control target of the stage is to ensure that the valve position of the regulating valve is in an optimal operation range and give consideration to the lifting of the water supply temperature, the control process is open-loop control, and after the mode B is triggered, the valve position of the regulating valve is quickly opened to 25% from the current value and is gradually opened to 40% along with the increase of the load;
c. when the unit load is more than 30% Pe and less than 75% Pe, the optimal load operation mode C is automatically triggered, and the mode C controls the water supply temperature rise increased by No. 0 to delta t through closed-loop controlψNamely the design water supply temperature rise under the psi load point, so that the water outlet temperature of No. 0 high heating reaches the design value, and the optimal control target is to change the controlled quantity of No. 0 high heating into the water supply temperature difference (delta t)ψ) The conventional fixed No. 0 high-pressure feed water outlet temperature is replaced, the upper limit of the regulating valve is set, and the set value is set to be 60%, so that on one hand, the No. 0 high-pressure feed water outlet temperature can be ensured to be close to the design temperature to the maximum extent, on the other hand, the regulating valve is ensured to operate in the optimal interval, a large amount of high-quality steam low-consumption caused by overlarge opening of the regulating valve is avoided, and the integral heat economy of the unit is reduced;
d. when the load of the unit continuously rises to more than 75%, a high-load exit mode D is automatically triggered, the control in the mode is open-loop control, namely the valve position of the valve adjusting of 0 pump is gradually closed along with the load rising from 75% Pe to 90% Pe, and the control target is orderly cut off No. 0 high plus.
The invention has the beneficial effects that:
1) and defining the comprehensive control target of 0 # high plus.
2) A three-level control scheme is proposed and defined.
3) And dividing the multi-working-condition operation interval with the number 0 being higher according to the starting operation process of the unit into four modes of ABCD, and setting a judgment standard.
4) The whole control process can be subjected to modular switching and can automatically run in the whole process.
5) Under the four modes of 0 # high-voltage operation, the three-level control target is restricted. The method can realize grading response and accurate control in the whole process, so that the controlled variable runs in the optimal interval.
6) Once abnormal working conditions occur, early warning and quick response can be realized, and adjustment can be performed as early as possible.
7) In the whole process control, the fixed value of the protection process action is determined. If 0 pumping pipeline overtemperature alarm is 510 DEG C
The valve position of the steam supplementing valve is more than 3 percent, and the like.
8) In the whole process control, the optimal value of a controlled target is considered, for example, the temperature rise rate of a heating pipe is less than 2.0 ℃/min, the valve position of an adjusting valve is 25-40 percent, and the set value t of the temperature rise of water supply is setin+Δtψ，And boundary conditions of target control are provided, such as temperature rise rate alarm, opening of an adjusting valve to an upper limit, vaporization early warning of an economizer and the like. The safety and the economical efficiency are both considered, and the overall control level of the unit is obviously improved.
Drawings
FIG. 1 is a conventional flow chart of 0 # Gao plus and a control station layout.
Wherein, 1 is a 0 pumping pipeline check valve, 2 is a 0 pumping pipeline steam inlet electric valve, 3 is a 0 pumping pipeline steam inlet regulating valve, 4 is a 0 high pressure steam inlet electric valve, 5 is a 0 high pressure steam inlet electric valve rear drain, 6 is a high pressure main steam valve, 7 is a high pressure regulating valve, 8 is a high pressure cylinder steam supplementing valve, 9 is a preposed pump inlet electric valve, 10 is a preposed pump inlet filter screen, 11 is a preposed pump, 12 is a water feed pump inlet filter screen, 13 is a water feed pump, 14 is a water feed electric valve, 15 is a 3-2-1 row high pressure, 16 is an external steam cooler, 17 is a 0 high pressure, 18 is a boiler economizer header, 0 pumping pipeline temperature rise rate, delta tψTemperature rise of design feedwater at psi load point, t1Is 0 pump line temperature, p1Is 0 pump line pressure, t2Is 0 # high inlet steam pipe temperature, p2High inlet steam pipe pressure of No. 0, t3The number 0 is high, the water drainage temperature after the steam inlet electric valve is increased, tinHigh feed water temperature of No. 0, toutHigh addition water temperature of No. 0, p3The feed water pressure at the inlet of the boiler economizer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1: according to the normal starting requirement of the unit, firstly, the feed water in the deaerator is subjected to pressure boosting through the pre-pump 11 and the feed pump 13 and then enters high pressure booster step by stepPassing through 3-2-115 rows of high pressure heaters and external steam coolers 16, finally feeding water into the No. 0 high pressure heater to exchange heat with the 0 pumped steam so as to improve the water outlet temperature t of the No. 0 high pressure heaterout.0 extracted steam is taken from 5-stage rear steam extraction port of high pressure cylinder, and the parameter is p1、t1The steam finally enters the No. 0 high pressure steam inlet valve through the No. 0 pumping check valve 1, the No. 0 pumping electric valve 2, the No. 0 pumping pipeline regulating valve 3 and the No. 0 high pressure steam inlet electric valve 4 respectively to complete steam-water heat exchange. The steam parameter before entering No. 0 high pressure is p2、t2. The feed water enters a boiler economizer header after heat exchange is finished at the high pressure of No. 0, and the feed water temperature is toutPressure p3。
When the unit is flushed to 3000r/min and the load is lower than 15% Pe, the heating pipe mode A of No. 0 high feeding is automatically fed. At this time, the 0-pumping pipeline regulating valve 3 is in an automatic position and meets the requirement of primary control. The regulating valve is under open-loop control, the regulating valve 3 is gradually opened under the constraint of the set pipeline temperature rise rate (less than 2.5 ℃/min), and when the regulating valve is opened to 8 percent, secondary control response is triggered to limit the regulating valve to be continuously opened. When 0 pumping the pipeline temperature t1No. 0 high steam inlet pipeline temperature t2And the front drainage temperature t of the No. 0 high-pressure steam-inlet electric valve3When the temperature is higher than 180 ℃, the mode A of the initial heating pipe feeding is judged to be finished, and the valve is adjusted to keep the current value after the completion. The control mode can realize that the heating pipe of the pipeline can be completed as soon as possible on the premise of not exceeding the set temperature rise rate.
And when the load is gradually increased from 15% Pe to 30% Pe after the unit is connected to the grid, automatically triggering the low-load operation mode B. At this time, the 0-pumping pipeline regulating valve 3 is in an automatic position and meets the requirement of primary control. The first-stage control requires that the valve position of the regulating valve 3 is opened to 25% from the valve position value after the mode A is finished, and is gradually opened to 40% along with the increase of the load. When the valve position is opened to 40%, the secondary control is triggered, and the adjustment valve is limited to be opened continuously.
The optimal load operating mode C is automatically triggered when the plant load continues to rise from 30% Pe to 75% Pe. And the 0 pumping pipeline regulating valve 3 is in an automatic position to meet the requirement of primary control. Under different load points psi, the designed No. 0 high-pressure water supply side temperature rise is delta tψ. The target temperature of the 0 # high pressure regulating valve is set as t in the primary controlin+ΔtψAnd simultaneously, setting the upper limit of the regulating valve, wherein the set value is positioned by 60 percent. After the first-stage control response, the 0-pumping pipeline regulating valve 3 is gradually adjusted, and once the opening of the regulating valve reaches 60%, the second-stage control is triggered to limit the regulating valve to be opened continuously. On the one hand, the high adding water temperature t of No. 0 can be ensuredoutThe maximum possible approach to the design temperature, on the other hand, ensures that the regulating valve operates in the optimum range. In addition, if the economizer vaporization early warning working condition occurs in the adjusting process (the judging condition of the working condition is that the No. 0 high charging water supply side pressure p3Corresponding saturation temperature and 0 # higher outlet water temperature toutThe difference is less than 35 ℃), and the secondary control is also triggered to limit the further opening of the regulating valve.
As the unit load further increases, when the load exceeds 75% Pe, the high load exit mode D is triggered at this time. And the 0 pumping pipeline regulating valve 3 is in an automatic position to meet the requirement of primary control. And the valve position 3 of the first-stage control down-regulation valve tracks the load and is in open-loop control. When the load is increased to 90% Pe, the regulating valve (3) is fully closed.
It is particularly emphasized that, in either ABCD mode, if 0 extraction duct wall temperature t occurs during the automatic adjustment process1And (3) sending out an overtemperature early warning (higher than 500 ℃), or sending out an early warning when the economizer vaporizes, or sending out an early warning when the temperature rise rate reaches a set upper limit value, and directly exiting the primary control and entering the secondary control by the hierarchical control strategy to inhibit the current adjustment strategy.
It is particularly emphasized that, in any of the ABCD modes, if the following four conditions occur during the automatic adjustment:
a. the steam compensating valve is opened because of participating in the primary frequency modulation of the unit or because of the sudden increase of the total flow instruction under the variable load working condition, and the valve position feedback of the steam compensating valve is more than 3 percent.
b. Temperature t of No. 0 pipe wall caused by internal leakage of steam compensating valve1Exceed alarm value (> 510 deg.C).
c. And triggering a high-acceleration splitting working condition.
d. The economizer vaporizes and alarms (the judgment condition is that the No. 0 high pressure of the water supply side is p3Corresponding saturation temperature and 0 # higher outlet water temperature toutDifference is less than 30℃)。
No matter which kind of operating mode appears above, all can trigger tertiary control. After the three-stage control action, all valves on the 0 pumping pipeline are closed in an overriding and quick mode, and the No. 0 high pressure steam inlet is cut off.
Claims (7)
1. A classification control method for a power station unit with a 0-size height under multi-working-condition operation is characterized by comprising the following steps;
(1) defining a control target of 0 # high plus;
on the premise of ensuring that the temperature of the No. 0 high-pressure steam inlet and outlet water reaches the design value, the No. 0 high-pressure steam inlet regulating valve operates in an optimal interval of 25% -45%, and once abnormity occurs, the control strategy can early warn, accurately alarm and quickly respond in advance, so that the safety of a unit is ensured;
(2) performing modular division on the multiple working conditions of the number 0 high pressure operation;
according to the starting process of the unit, the multi-working-condition operation process is divided into four stages, and four switching modes are correspondingly adopted, namely a primary heating pipe switching mode A, a low-load operation mode B, an optimal load operation mode C and a high-load exit mode D;
(3) the control process is divided into three-level control, and the control authority is increased step by step; namely, if the secondary control condition is triggered, the primary control is locked; and if the three-level control condition is triggered, directly limiting the first-level control and the second-level control.
2. The method for controlling the number 0 of the power station unit in the grading mode under the multi-working-condition operation according to claim 1, wherein the initial heating pipe mode A corresponds to the turbine constant speed of 3000r/min till the generator grid-connected initial stage reaches 15% rated load (P)e) A stage;
the load of the corresponding unit in the low-load operation mode B reaches 15 percent PeTo 30% PeA stage;
the load of the corresponding unit in the optimal load mode C reaches 30 percent PeTo 75% PeA stage;
the load of the corresponding unit in the high-load exit mode D reaches 75 percent PeTo 95% PeAnd (5) stage.
3. The method for the hierarchical control of the number 0 of the power station unit under the multi-working-condition operation as claimed in claim 2, wherein the primary control is to automatically select the optimal control targets of different modes:
a. in the initial heating pipe feeding mode A, the optimal control target is the temperature rise rate, so that the situation that the temperature rise of a No. 0 high-pressure heating pipeline is too fast in the heating pipe stage is prevented, and meanwhile, the situation that the heating pipe time is too long is avoided;
b. in the low-load operation B mode, the optimal control target is the valve position of the 0-pumping pipeline, and the optimal valve characteristic is ensured to work;
c. in the optimal load operation C mode, the optimal control target is to control the water supply temperature of the 0 # high-pressure water supply outlet to be close to the design value as far as possible, and meanwhile, the optimal operation of the 0-pumping pipeline regulating valve in the range of 25% -45% in opening degree is guaranteed.
d. Under the high-load exit D mode, the optimal control target is to close the 0 pumping pipeline regulating valve according to the set rate, and exit the 0 # high plus.
4. The method for controlling the number 0 of the power station unit under the multi-working-condition operation in the grading manner according to claim 2, wherein the secondary control is inhibition adjustment:
a. in the mode of the initial heating pipe A, when the temperature rise rate reaches 2.5 ℃/min, the 0-pumping pipeline regulating valve is limited to be continuously opened; when the temperature rise rate does not reach 2.5 ℃/min, setting the upper limit of the 0-pumping pipeline regulating valve to be 8%, and limiting the regulating valve to be continuously opened in the pipe heating process;
b. in a low-load operation B mode, the valve position of the 0-pumping pipeline adjusting valve is controlled along with the load open loop, an upper limit and a lower limit are set, the upper limit is set to be 40%, the lower limit is set to be 25%, and the condition that the adjusting valve is too large or too small in opening degree is avoided;
c. in the optimal load operation C mode, setting the upper limit of the valve position of the 0-pumping pipeline adjusting valve to be 60 percent, and limiting the valve position to be continuously opened;
d. and in the high-load exit D mode, the closing speed of the 0-pump pipeline regulating valve is limited, and the regulating valve is prevented from closing too fast or too slow in the load section.
5. The grading control method of the number 0 high of the power station unit under the multi-working-condition operation according to claim 2, characterized in that the three-level control is an override control, the 0 suction adjusting valve is immediately closed after the three-level control is triggered, the number 0 high is cut off, and the three-level control is triggered under the following four conditions in the multi-working-condition full-automatic operation:
firstly, the steam compensating valve is opened because of participating in primary frequency modulation of the unit or because of sudden increase of total flow instructions under variable load working conditions, and the judgment standard that the valve position feedback of the steam compensating valve is more than 3 percent is taken as a judgment standard;
secondly, the overtemperature of the No. 0 high heating pipe wall is set to 510 ℃ to an alarm value due to the internal leakage of the steam supplementing valve;
thirdly, triggering 0 # high-plus override cutting under the high-plus splitting working condition;
fourthly, the economizer vaporizes and reports to the police, the judgement condition of this operating mode is: no. 0 high feed water side pressure p3Corresponding saturation temperature and 0 # higher outlet water temperature toutThe difference is less than 30 ℃.
6. The stage control method for the power station unit under the multi-working-condition operation with the 0 # altitude as claimed in claim 2, wherein under any one of the A, B, C, D four modes, if the 0 extraction pipe wall temperature t is equal to1Sending out overtemperature warning (more than 500 ℃) or sending out economizer vaporization warning (the judgment condition of the working condition is that the No. 0 high charging water supply side pressure p3Corresponding saturation temperature and 0 # higher outlet water temperature toutAnd when the difference is less than 35 ℃, directly removing the primary control, namely abandoning the optimal target control, entering the secondary control, inhibiting the current control strategy, and adjusting the opening of the throttle in the direction of normal operation of the protection equipment and the unit.
7. A hierarchical control operation method for a power station unit with a 0-size high load under multi-working-condition operation is characterized by comprising the following steps:
a. when the unit is flushed to 3000r/min and the load does not reach 15% Pe, the initial heating pipe feeding mode A is automatic, and the control target is 0 temperature rise of the pipelineThe rate requires that the temperature rise rate is not more than 2.5 ℃/min in the mode A, the controlled object is 0 degree of opening of the regulating valve of the pumping pipeline, the upper limit of the regulating valve in the mode is set to be 8 percent, the control process is open-loop control, as long as the temperature rise rate is not over-limit, the regulating valve is opened at a certain rate until the upper limit is 8 percent, so as to ensure the fastest heating pipe rate, if the temperature rise rate in the opening process of the regulating valve is higher than 2.5 ℃/min, the temperature rise rate alarm in the secondary control is triggered, the regulating valve is limited to be continuously opened, and when the temperature t of the pumping pipeline is1No. 0 high steam inlet pipeline temperature t2And the front drainage temperature t of the No. 0 high-pressure steam-inlet electric valve3When the temperature is higher than 180 ℃, judging that the initial heating pipe feeding mode A is finished, and after finishing, adjusting the valve to keep the current value;
b. when the load of the unit is more than 15% Pe and less than 30% Pe, automatically triggering a low-load operation mode B, wherein the control target of the stage is to ensure that the valve position of the regulating valve is in an optimal operation range and give consideration to the lifting of the water supply temperature, the control process is open-loop control, and after the mode B is triggered, the valve position of the regulating valve is quickly opened to 25% from the current value and is gradually opened to 40% along with the increase of the load;
c. when the unit load is more than 30% Pe and less than 75% Pe, the optimal load operation mode C is automatically triggered, and the mode C controls the water supply temperature rise increased by No. 0 to delta t through closed-loop controlψNamely the design water supply temperature rise under the psi load point, so that the water outlet temperature of No. 0 high heating reaches the design value, and the optimal control target is to change the controlled quantity of No. 0 high heating into the water supply temperature difference (delta t)ψ) The conventional fixed No. 0 high-pressure water outlet feed temperature is replaced, the upper limit of the regulating valve is set at the same time, and the set value is positioned by 60%, so that on one hand, the No. 0 high-pressure water outlet temperature can be ensured to be close to the design temperature to the maximum extent, on the other hand, the regulating valve is ensured to operate in the optimal interval, the low use of a large amount of high-quality steam caused by the overlarge opening of the regulating valve is avoided, and the overall heat economy of the unit is reduced;
d. when the load of the unit continuously rises to more than 75%, a high-load exit mode D is automatically triggered, the control in the mode is open-loop control, namely the valve position of the valve adjusting of 0 pump is gradually closed along with the load rising from 75% Pe to 90% Pe, and the control target is orderly cut off No. 0 high plus.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010302169.8A CN111396855B (en) | 2020-04-16 | 2020-04-16 | Grading control and operation method for power station unit No. 0 high under multi-working-condition operation |
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| CN202010302169.8A CN111396855B (en) | 2020-04-16 | 2020-04-16 | Grading control and operation method for power station unit No. 0 high under multi-working-condition operation |
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| CN111396855B CN111396855B (en) | 2021-07-20 |
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| CN112833453A (en) * | 2021-01-04 | 2021-05-25 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | No. 0 high-voltage power supply optimization control system based on multi-data judgment |
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