CN113432108A - Water level control optimization method for deaerator under deep peak shaving of thermal power plant unit - Google Patents
Water level control optimization method for deaerator under deep peak shaving of thermal power plant unit Download PDFInfo
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- CN113432108A CN113432108A CN202110730532.0A CN202110730532A CN113432108A CN 113432108 A CN113432108 A CN 113432108A CN 202110730532 A CN202110730532 A CN 202110730532A CN 113432108 A CN113432108 A CN 113432108A
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- deaerator
- water
- unit load
- valve
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 133
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005457 optimization Methods 0.000 title claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims abstract description 31
- 230000001276 controlling effect Effects 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 6
- 229910052760 oxygen Inorganic materials 0.000 claims 6
- 239000001301 oxygen Substances 0.000 claims 6
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005032 impulse control Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Classifications
-
- 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
-
- 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
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/34—Applications of valves
Abstract
The invention relates to a water level control optimization method of a deaerator under a thermal power plant unit deep peak shaving, which comprises the following three regulation measures, namely 1, an upper water regulating valve of the deaerator automatically regulates the opening of the valve according to the load of the unit to regulate the pressure of condensed water; 2, the condensate pump recirculation valve is transformed from a switch type valve into an adjusting type valve, and the water level fluctuation of the deaerator caused by the valve switch is reduced under the deep adjusting working condition; and 3, any one of the two feed pumps of the unit can automatically perform output offset according to the load of the unit under the deep peak shaving working condition. The invention realizes the stability of the water level control of the deaerator during the deep adjustment of the unit.
Description
Technical Field
The invention relates to a water level control method, in particular to a water level control optimization method for a deaerator under a thermal power plant unit deep peak shaving.
Background
The water level of the deaerator is normally controlled by three impulses: the water level of the deaerator, the flow of condensed water and the total water supply flow (including desuperheating water) can be controlled by a condensate pump frequency conversion pump, or the water level of the deaerator is controlled by a condensate pump water supply regulating valve, three impulse or single impulse control modes are provided respectively, the flow of condensed water is lower than 280t/h and automatically exits three impulse, the flow of condensed water is higher than 500t/h and automatically enters three impulse control, when the condensate pump frequency converter and the deaerator water supply regulating valve are automatically simultaneously entered, the deaerator water supply regulating valve is fully opened, and the water level is regulated by the condensate pump frequency conversion.
When the unit deep-adjusting working condition is increased, the using amount of condensed water under the low-load working condition is reduced, the condensate pump recirculation valve is opened and closed frequently, the condensate pump recirculation valve is an opening and closing valve controlled by an electromagnetic valve, the deaerator is unstable in water level control and large in fluctuation, stable operation of the unit is not facilitated, the pressure of the condensed water cannot be guaranteed, the condensed water provides mechanical sealing water for a front pump and a main pump of a small machine, the pressure of the condensed water cannot be guaranteed, and the operation safety of the small machine water feeding pump is seriously influenced.
Therefore, it is necessary to develop a method for controlling the water level of the deaerator during deep adjustment of the unit, which can not only adjust the pressure of the condensed water, but also control the liquid level of the deaerator stably.
Disclosure of Invention
The invention aims to provide a deaerator water level control optimization method under a deep peak regulation working condition of a thermal power plant unit, so that the deaerator water level control is stable and the unit can stably run during the deep peak regulation of the unit.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
comprises the following three regulation measures
(1) The water feeding regulating valve of the deaerator automatically regulates the opening of the valve according to the unit load so as to regulate the pressure of condensed water;
(2) the condensate pump recirculation valve is a regulating valve, and the water level fluctuation of the deaerator caused by the valve switch is reduced under the deep regulation working condition;
(3) any one of the two water feeding pumps of the unit can automatically perform output bias according to the load of the unit under the deep peak regulation working condition, and the water feeding amount is regulated.
Further, in the step (1), different opening degrees of the water feeding and adjusting door of the deaerator are set for different unit loads according to the method for automatically adjusting the valve opening degree of the unit load, when the unit load is 150MW, the opening degree of the water feeding and adjusting door of the deaerator is 100%, when the unit load is 95MW, the opening degree of the water feeding and adjusting door of the deaerator is 20%, and when the unit load is 95MW to 150MW, the corresponding relation of the unit load and the opening degree of the water feeding and adjusting door of the deaerator is determined through a corresponding relation line graph.
Furthermore, the corresponding relation line graph of the unit load and the water feeding regulating opening of the deaerator is obtained by taking the corresponding water feeding regulating opening of the deaerator when the unit load is 100MW, 115MW, 135MW or 140 MW, and connecting two adjacent points by straight lines; and the unit load of any point of the unit load from 95MW to 150MW is adjusted by finding the corresponding water-supply regulating opening of the deaerator in the line graph.
Further, in the step (2), the flow rate of the condensed water is lower than 250t/h, and the recycling valve of the condensate pump is fully opened, and the flow rate is higher than 500 t/h.
Furthermore, in the step (3), the method for automatically adjusting according to the unit load is that a feedwater pump output offset curve is drawn, and corresponding feedwater pump output increase percentages under different unit loads are obtained from the offset curve.
Further, in the step (3), when the unit load is 150MW, the feed water pump output is increased by 0%, and when the unit load is 95MW, the feed water pump output is increased by 18%.
Further, in the step (3), when the unit load is between 95MW and 150MW, and when the unit load is 100MW, 125MW, 135MW and 140 MW, the corresponding output increase percentage of the water pump is taken, and two adjacent points are connected by a straight line to obtain a water pump output offset curve; and the unit load of any point of the unit load from 95MW to 150MW is adjusted by finding the corresponding feed water pump output increase percentage in the water pump output offset curve finding.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention can adapt to the stable control of the water level of the deaerator under different working conditions in the high-load and low-load intervals of the unit.
(2) Under the deep adjustment working condition of the unit, the corresponding relation of the line chart determined in the step (1) of water feeding and valve adjusting of the deaerator is used for automatically adjusting the valve opening, so that the manual adjustment workload of operators is reduced, and the requirement on the condensate outlet condensate pressure is met.
(3) The pump recycling valve is an adjusting valve, the operator can set flow to be automatically adjusted, and the deaerator water level fluctuation caused by opening and closing the valve greatly is avoided while the pump is protected.
(4) After the automatic biasing output logic of the water feeding pump, namely the automatic adjustment method of the unit load is set, under the condition that the unit is frequently deeply adjusted, the workload of manually controlling the output of the water feeding pump by an operator supervision panel is saved, reliable output biasing can be realized, and the safety and reliability of a water feeding system are ensured.
Drawings
FIG. 1 is a water supply opening degree curve of a deaerator;
FIG. 2 shows a water pump output bias curve.
Detailed Description
The present invention will be described in further detail below with reference to examples.
The rated capacity of the unit is 300MW, and the deep peak regulation working condition is under 50% of rated power, namely under 150 MW.
The invention relates to a water level control method of a deaerator of a thermal power plant unit, which comprises the following three regulation measures, wherein the regulation measures in the following three measures can be carried out simultaneously without being divided into front and back measures.
(1) In normal load interval, when the water feeding regulating valve of the condensate pump frequency converter and the deaerator are put into operation simultaneously, the deaerator
The water feeding adjusting valve keeps 100% of opening degree, and the water level of the deaerator is controlled by a condensing pump frequency converter. During the deep adjustment of the unit, the water feeding adjusting valve of the deaerator automatically adjusts the opening of the valve according to the load of the unit so as to adjust the pressure of the condensed water. Referring to fig. 1, in step (1), different opening degrees of the water supply regulating valve of the deaerator are set for different unit loads according to a method for automatically regulating the valve opening degree of the unit load, when the unit load is 150MW, the opening degree of the water supply regulating valve of the deaerator is 100%, when the unit load is 95MW, the opening degree of the water supply regulating valve of the deaerator is 20%, and when the unit load is 95MW to 150MW, the unit load is determined by obtaining a corresponding relation line graph of the unit load and the opening degree of the water supply regulating valve of the deaerator, as shown in fig. 1. The method for acquiring the corresponding relation line graph of the unit load and the water feeding and adjusting opening of the deaerator comprises the following steps of taking the corresponding water feeding and adjusting opening of the deaerator when the unit load is 100MW, 115MW, 135MW and 140 MW, and connecting two adjacent points by using a straight line; and the unit load of any point of the unit load from 95MW to 150MW is adjusted by finding the corresponding water-supply regulating opening of the deaerator in the line graph.
And taking the method for automatically adjusting the valve opening according to the unit load as the logic of the valve opening of the unit load automatic adjusting valve, so that the condensate water pressure is automatically adjusted to meet the requirement of the deep adjusting working condition by the water feeding adjusting valve of the deaerator during the deep adjusting period according to the logic of the valve opening of the unit load automatic adjusting valve. The step is the method for adjusting the water feeding regulating valve of the deaerator when the condensate pump frequency converter and the water feeding regulating valve of the deaerator are put into operation simultaneously. The line graph of the corresponding relation between the unit load and the water feeding and regulating opening of the deaerator is an empirical function obtained through multiple deep debugging and testing according to the unit, so that under the working condition of deep debugging of the unit, the corresponding relation of the line graph determined in the water feeding and regulating step (1) of the deaerator is used for automatically regulating the opening of the valve, the manual regulation workload of operators is reduced, and the requirement on the pressure of condensed water at the outlet of the condensate pump is met.
(2) The condensate pump recirculation valve is changed from an open-close valve to an adjustable valve, the condensate flow is low, and the condensate pump recirculation valve is opened
The pump recirculation valve protects the condensate pump from cavitation, the original recirculation valve is controlled by an electromagnetic valve and is only controlled by a full-open and full-close position, the condensate flow is lower than 250t/h, the condensate pump recirculation valve is fully opened, and the condensate pump recirculation valve is fully closed at a flow rate of more than 500 t/h.
The condensate pump recirculation valve is changed into a regulating valve, and the condensate pump recirculation valve is automatically regulated to a set flow rate at the time between 250t/h and 500t/h flow rates (including 250t/h and 500 t/h). The operating personnel can set for flow automatically regulated, congeals the pump in the protection, avoids by a wide margin the switch valve from causing the oxygen-eliminating device water level fluctuation.
DCS increases automatic control and regulation logic, can better control the flow of condensed water, the valve can be free from full-opening and full-closing actions, the fluctuation of the flow of condensed water is greatly reduced, and the water level control of the deep-regulation working condition deaerator is more stable. Such as: the operator sets the flow constant value to be 350t/h, the valve is slowly opened after the flow is lower than 350t/h to adjust the condensate flow to be 350t/h, and the fluctuation of the condensate flow is reduced because the valve acts smoothly. If the amount of condensed water further reduces and is less than 250t/h, the valve is opened entirely, compares before greatly reduced the disturbance, and the flow is after crescent again, and the valve also is slowly closed, to sum up has promoted the control quality of oxygen-eliminating device water level.
(3) During the deep adjustment of the unit, the water supply quantity demand is reduced, the output of the two water supply pumps can reach the minimum output,
if the recirculation valve of the water feeding pump is opened at the same time, the water feeding flow of the unit is greatly fluctuated, and the safe operation of the unit is influenced. The automatic biasing logic of the water feeding pump is set, when the unit is deeply regulated, the output of the water feeding pump is automatically biased, the biasing amount can be automatically adjusted according to different loads, the output of the two water feeding pumps is different, the recirculation valve of the water feeding pump with small output is opened, the stability of water feeding control is realized during the deep regulation of the unit, and the stability of the water level control of the deaerator is ensured.
The power plant unit is provided with two water pumps, and the automatic output offset adjustment of the water supply quantity is carried out on any one of the two water supply pumps of the power plant unit, namely only one of the two water supply pumps according to the load of the power plant unit.
Referring to fig. 2, in the step (3), the method for automatically adjusting according to the unit load includes drawing a feed pump output offset curve, and obtaining corresponding feed pump output increase percentages under different unit loads from the offset curve.
In the step (3), when the unit load is 150MW, the output of the feed pump is increased by 0%, and when the unit load is 95MW, the output of the feed pump is increased by 18%.
In the step (3), when the unit load is between 95MW and 150MW, and the unit load is 100MW, 125MW, 135MW and 140 MW, the corresponding output of the water pump is increased by percentage, and two adjacent points are connected by a straight line to obtain a water pump output offset curve; and the unit load of any point of the unit load from 95MW to 150MW is adjusted by finding the corresponding feed water pump output increase percentage in the water pump output offset curve finding.
For example, when the A water feeding pump is thrown in the bias automatically, the output of the A water feeding pump automatically increases according to the load when the load is lower than 150MW, and the automatically increased output bias is displayed on a picture. The AB pump can not be simultaneously put into automatic biasing, and the automatic biasing does not influence manual biasing operation and manual biasing amount display of operators.
After the automatic biasing output logic of the water feeding pump, namely the automatic adjustment method of the unit load is set, under the condition that the unit is frequently deeply adjusted, the workload of manually controlling the output of the water feeding pump by an operator supervision panel is saved, reliable output biasing can be realized, and the safety and reliability of a water feeding system are ensured.
The invention is applied to the measurement of the water level of the deaerator of the thermal power plant, and can adapt to the stable control of the water level of the deaerator under different working conditions in high and low load sections of a unit.
Those skilled in the art can readily devise many other varied embodiments that will still fall within the scope of the appended claims without the use of the teachings of this invention.
Claims (7)
1. A water level control optimization method of a deaerator under a thermal power plant unit deep peak shaving is characterized by comprising the following three aspects of regulation and control measures.
(1) The water feeding regulating valve of the deaerator automatically regulates the opening of the valve according to the unit load so as to regulate the pressure of condensed water;
(2) the condensate pump recirculation valve is a regulating valve, and the water level fluctuation of the deaerator caused by the valve switch is reduced under the deep regulation working condition;
(3) any one of the two water feeding pumps of the unit can automatically perform output bias according to the load of the unit under the deep peak regulation working condition, and the water feeding amount is regulated.
2. The method for optimizing the water level control of the oxygen eliminating device under the deep peak shaving of the thermal power plant unit according to claim 1, wherein in the step (1), different opening degrees of a water feeding adjusting door of the oxygen eliminating device are set for different unit loads according to a method for automatically adjusting the opening degree of the valve of the unit load, when the unit load is 150MW, the opening degree of the water feeding adjusting door of the oxygen eliminating device is 100%, when the unit load is 95MW, the opening degree of the water feeding adjusting door of the oxygen eliminating device is 20%, and when the unit load is 95MW to 150MW, the optimization method is determined through a corresponding relation broken line graph of the unit load and the opening degree of the water feeding adjusting door of the oxygen eliminating device.
3. The method for optimizing the water level control of the deaerator under the deep peak shaving of the thermal power plant unit according to claim 2, characterized in that the corresponding relation line graph of the unit load and the opening degree of the water feeding and adjusting of the deaerator is obtained by taking the corresponding opening degree of the water feeding and adjusting of the deaerator when the unit load is 100MW, 115MW, 135MW and 140 MW, and connecting two adjacent points by straight lines; and the unit load of any point of the unit load from 95MW to 150MW is adjusted by finding the corresponding water-supply regulating opening of the deaerator in the line graph.
4. The method for optimizing the water level control of the deaerator under the deep peak shaving of the thermal power plant unit as claimed in claim 1, wherein in the step (2), the flow rate of the condensed water is lower than 250t/h, and the recirculation valve of the condensate pump is fully opened, and the flow rate is higher than 500 t/h.
5. The method for optimizing the water level control of the deaerator under the deep peak shaving of the thermal power plant unit as claimed in claim 1, wherein in the step (3), the automatic adjustment is performed according to the unit load by drawing a feedwater pump output offset curve and obtaining the corresponding percentage increase of the feedwater pump output under different unit loads from the offset curve.
6. The method for controlling the water level of the deep-peaking oxygen remover of the thermal power plant unit according to claim 5, wherein in the step (3), the output of the feed water pump is increased by 0% when the unit load is 150MW, and the output of the feed water pump is increased by 18% when the unit load is 95 MW.
7. The method for controlling and optimizing the water level of the deaerator under the deep peak shaving of the thermal power plant unit according to claim 6, characterized in that in the step (3), when the unit load is between 95MW and 150MW, when the unit load is 100MW, 125MW, 135MW and 140 MW, the corresponding output of the water feeding pump is increased by percentage, and two adjacent points are connected by a straight line to obtain a water pump output offset curve; and the unit load of any point of the unit load from 95MW to 150MW is adjusted by finding the corresponding feed water pump output increase percentage in the water pump output offset curve finding.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113834057A (en) * | 2021-11-03 | 2021-12-24 | 西安热工研究院有限公司 | Wide-load self-adaptive optimization system for unit condensed water |
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2021
- 2021-06-29 CN CN202110730532.0A patent/CN113432108A/en active Pending
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