CN112361324B - Energy-saving and consumption-reducing method for condensate pump of double reheating unit - Google Patents
Energy-saving and consumption-reducing method for condensate pump of double reheating unit Download PDFInfo
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- CN112361324B CN112361324B CN202011277014.XA CN202011277014A CN112361324B CN 112361324 B CN112361324 B CN 112361324B CN 202011277014 A CN202011277014 A CN 202011277014A CN 112361324 B CN112361324 B CN 112361324B
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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
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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Abstract
The invention discloses a method for saving energy and reducing consumption of a condensate pump of a double reheating unit, which comprises the following steps: (1) when the opening degree of the main regulating valve of the deaerator is larger than 70%, the auxiliary regulating valve is opened to participate in the pressure regulation of the condensed water, the auxiliary regulating valve is gradually opened along with the increase of the opening degree of the main regulating valve, and the auxiliary regulating valve is also opened to 100% after the main regulating valve is fully opened; (2) re-making a load-condensation water pressure curve; (3) 'the frequency conversion condensate pump operates, the water level of the deaerator is less than 400mm, the difference value between the pressure of a main pipe at the outlet of the condensate pump and the pressure of the deaerator is less than 0.2MPa, and the backup pump is started in a combined mode'; (4) and the logic that when the variable-frequency condensate pump is tripped and the standby power-frequency condensate pump is started jointly, the auxiliary regulating valve is closed in an interlocking manner, and the main regulating valve is automatically closed to the corresponding opening degree of the load according to the load is added. The invention effectively reduces the throttling loss of a condensate system and the frequency conversion power of the condensate pump, and realizes energy conservation, consumption reduction, quality improvement and efficiency improvement on the premise of ensuring the safety of a unit.
Description
Technical Field
The invention relates to the technical field of energy conservation and consumption reduction of power plants, in particular to a method for saving energy and reducing consumption of a condensate pump of a secondary reheating unit.
Background
No. 6 and No. 7 secondary reheating units of a certain power plant are respectively provided with two 100% capacity condensate pumps, one is operated in a frequency conversion mode, and the other is standby at power frequency. The water level of the deaerator is adjusted by the condensate pump through frequency conversion, the pressure of a condensate pump outlet main pipe is adjusted by a deaerator water feeding main adjusting valve, the pressure set value of the condensate pump main pipe changes along with a load function, and a deaerator water feeding auxiliary adjusting valve is kept closed completely.
At present, the pressure set value of a condensate pump outlet main pipe corresponding to each load section is higher, so that a water feeding main regulating valve of a deaerator cannot be fully opened under the load of 850MW, and a throttling phenomenon always exists; to reduce the power consumption of the condensate pump, the condensate pressure must be further reduced. However, the decrease in the condensation water pressure has several problems: firstly, the difference between the condensation water pressure and the deaerator pressure is reduced, and the water level safety of the deaerator is influenced; secondly, the influence on the miscellaneous mother pipe user of the condensate water is large when the pressure of the condensate water mother pipe is reduced, especially the seal water of the water feeding pump can not meet the requirement of the seal water of the water feeding pump, the existing domestic unit adopting the deep frequency conversion of the condensate water pump is mostly provided with the seal water booster pump of the water feeding pump, although the power consumption of the condensate pump is reduced, the investment is large, the system is more complicated, and the power consumption of the booster pump is increased; thirdly, the pressure of the condensed water is reduced compared with the prior pressure at low load, the pressure is close to the joint starting value of the standby pump, the anti-interference capability is weak, and the standby condensed water pump is easy to be jointly started; and fourthly, when the main regulating valve and the auxiliary regulating valve of the deaerator are both opened in normal operation, the condensate pump trips, the condensate pressure rises suddenly after the power frequency condensate pump is started in a combined mode, and if the water feeding regulating valve of the deaerator is not adjusted in time, the deaerator is extremely easy to be full of water.
Disclosure of Invention
Aiming at the prior art, the invention aims to provide an energy-saving and consumption-reducing method for a condensate pump of a double reheating unit, which does not increase any equipment and does not need any investment, and can reduce the power consumption of the condensate pump only by modifying optimization logic, carrying out measures such as test observation on each user of the condensate water and the like; the invention can be comprehensively popularized in the supercritical thermal power generating units with the same type of equipment.
In order to realize the purpose, the invention adopts the following technical scheme:
the invention provides a method for saving energy and reducing consumption of a condensate pump of a double reheating unit, which comprises the following steps:
(1) modifying the logic of the auxiliary regulating valve of the deaerator, after the opening degree of the main regulating valve of the deaerator is larger than 70%, the auxiliary regulating valve is opened to participate in the pressure regulation of the condensed water, the auxiliary regulating valve is gradually opened along with the increase of the opening degree of the main regulating valve, and the relation between the main regulating valve and the auxiliary regulating valve is shown in figure 4 when the main regulating valve is fully opened and the auxiliary regulating valve is also opened to 100%; the pressure of the condensate header can be reduced, the throttling loss is reduced, and the power of the variable-frequency condensate pump is reduced;
(2) starting from the sealing water pressure of the water supply pump, which is the most main factor for restricting the reduction of the condensation water pressure, by reducing the condensation water pressure of each load section of 500MW-1000MW, recording the corresponding condensation water pressure value when the return water temperature of the sealing water of the water supply pump exceeds 60 ℃, taking the value as the lower limit of the condensation water pressure, and re-making a 'load-condensation water pressure' curve, wherein the 'load-condensation water pressure' curve is shown in figure 5, the pressure of a condensation water bus pipe in normal operation is reduced, and the power of the condensation water pump is reduced; under the condition of not increasing a sealing water booster pump, the condensation water pressure is reduced by 0.2-0.3MPa averagely compared with the prior art, in all load sections of 500MW-1000MW, the opening of a sealing water adjusting valve of a water supply pump is about 30% -40%, the return water temperature of the sealing water of the water supply pump is kept about 50 ℃ of a set value, and the sealing effect is good;
(3) modifying logic that the variable-frequency condensate pump operates, the water level of a deaerator is less than 400mm, the difference value between the pressure of a main pipe at the outlet of the condensate pump and the pressure of the deaerator is less than 0.2MPa, and starting a standby pump in a combined mode; meanwhile, an alarm that the difference value between the condensed water pressure and the deaerator pressure is less than 0.3MPa and the condensed water pressure is low is added; therefore, normal water feeding of the deaerator can be met, and the false starting of the standby pump is avoided;
(4) when the variable-frequency condensate pump is tripped and the standby power-frequency condensate pump is started jointly, the logic that the auxiliary regulating valve is interlocked and fully closed and the main regulating valve is automatically closed to the corresponding opening of the load according to the load is added, and when the standby power-frequency condensate pump is started jointly, the relation between the opening of the main regulating valve and the load is shown in fig. 6; the flow of condensed water can be controlled, and the phenomenon that the deaerator is full of water is caused by the fact that the frequency conversion condensing pump is tripped and the standby power frequency condensing pump is jointly started can be prevented.
The invention has the beneficial effects that:
1. the invention does not increase any equipment, does not need any investment, only needs to modify the optimization logic, carries out measures such as test observation and the like on each user of the condensed water, and can reduce the power consumption of the condensed water pump; the invention can be comprehensively popularized in the supercritical thermal power generating units with the same type of equipment.
2. According to the invention, through modifying and optimizing the logic of the interlocking start of the standby pump and the condensate pump, the logic of the water feeding main regulating valve and the auxiliary regulating valve of the deaerator and other measures, the throttling loss of the condensate system and the frequency conversion power of the condensate pump are effectively reduced, and the energy conservation, consumption reduction, quality improvement and efficiency improvement are realized on the premise of ensuring the safety of a unit.
Drawings
FIG. 1 is a current comparison graph of a condensate pump at different load sections before and after implementation of an embodiment of the present invention.
FIG. 2 is a graph of a comparison of condensate header pressures at different load stages before and after implementation of an embodiment of the present invention.
FIG. 3 is a graph showing the power consumption of the coagulation pump in each month before and after the implementation of the embodiment of the present invention.
FIG. 4 is a diagram showing the relationship between the main control valve and the sub-control valve in step (1) of the present invention.
FIG. 5 is a graph showing the relationship between the load and the set pressure of the condensate in the step (2) of the present invention.
Fig. 6 is a graph showing the relationship between the opening of the main regulating valve and the load when the standby power-frequency condensate pump is started in step (4) of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
As introduced in the background art, the pressure set value of the outlet main pipe of the condensate pump corresponding to each load section is higher at present, so that the main water regulating valve on the deaerator cannot be fully opened under the load of 850MW, and the throttling phenomenon exists all the time; in order to reduce the power consumption of the condensate pump, the condensate pressure must be further reduced, but the reduction of the condensate pressure has many problems.
Therefore, the invention discloses an energy-saving and consumption-reducing method for a condensate pump of a double reheating unit, which effectively reduces the throttling loss of a condensate system and the variable frequency power of the condensate pump by modifying and optimizing the logic of the interlocking start of a standby pump and the condensate pump, the logic of a main water regulating valve and an auxiliary water regulating valve of a deaerator and the like, and realizes energy saving, consumption reduction, quality improvement and efficiency improvement on the premise of ensuring the safety of the unit.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
A method for saving energy and reducing consumption of a condensate pump of a double reheating unit comprises the following steps:
(1) modifying the logic of an auxiliary regulating valve of the deaerator, and opening the auxiliary regulating valve to participate in the pressure regulation of the condensed water after the opening degree of a main regulating valve of the deaerator is larger than 70%, wherein the auxiliary regulating valve is gradually opened along with the increase of the opening degree of the main regulating valve, and the auxiliary regulating valve is also opened to 100% after the main regulating valve is fully opened; the relationship between the main regulating valve and the auxiliary regulating valve is shown in FIG. 4; the pressure of the condensate header can be reduced, the throttling loss is reduced, and the power of the variable-frequency condensate pump is reduced;
(2) starting from the most main factor restricting the reduction of the condensed water pressure, the condensed water pressure of each load section of 500MW-1000MW is reduced, the corresponding condensed water pressure value when the return water temperature of the sealed water of the water supply pump exceeds 60 ℃ is recorded and is taken as the lower limit of the condensed water pressure, a 'load-condensed water pressure' curve is re-made, the 'load-condensed water pressure' curve is shown in figure 5, and the pressure set value of a condensed water bus is the pressure of a deaerator plus 0.5 MPa. The pressure of a condensate header in normal operation is reduced, and the power of a condensate pump is reduced; under the condition of not increasing a sealing water booster pump, the condensation water pressure is reduced by 0.2-0.3MPa averagely compared with the prior art, in all load sections of 500MW-1000MW, the opening of a sealing water adjusting valve of a water supply pump is about 30% -40%, the return water temperature of the sealing water of the water supply pump is kept about 50 ℃ of a set value, and the sealing effect is good;
(3) modifying logic that the variable-frequency condensate pump operates, the water level of a deaerator is less than 400mm, the difference value between the pressure of a main pipe at the outlet of the condensate pump and the pressure of the deaerator is less than 0.2MPa, and starting a standby pump in a combined mode; meanwhile, an alarm that the difference value between the condensed water pressure and the deaerator pressure is less than 0.3MPa and the condensed water pressure is low is added; therefore, normal water feeding of the deaerator can be met, and the false starting of the standby pump is avoided;
(4) when the standby power-frequency condensate pump is started in a combined mode, the flow rate of condensate can be greatly increased, in order to control the flow rate of condensate, prevent the frequency conversion condensate pump from tripping and the standby power-frequency condensate pump from being started in a combined mode to cause the deaerator to be full of water, and increase the logic that when the frequency conversion condensate pump trips and the standby power-frequency condensate pump is started in a combined mode, the auxiliary regulating valve is fully closed in an interlocking mode, and the main regulating valve is automatically closed to the corresponding opening degree of the load according to the load; when the standby power-frequency condensate pump is started in a combined mode, the relation between the opening degree of the main regulating valve and the load is shown in fig. 6, and when the standby power-frequency condensate pump is started in a combined mode, the opening degree of the main regulating valve is obtained through calculation according to the flow rate of condensate corresponding to the load at that time. The flow of condensed water can be controlled, and the phenomenon that the deaerator is full of water is caused by the fact that the frequency conversion condensing pump is tripped and the standby power frequency condensing pump is jointly started can be prevented.
According to the invention, on the premise of meeting the requirements of users such as water sealing of a water supply pump and the like and ensuring the water level safety of a deaerator, the pressure of the condensate header of the unit No. 6 and the unit No. 7 is reduced by 0.2-0.3MPa on average, the power consumption of the condensate pump is reduced from 0.141% in 2018 (before implementation) to 0.118% in 2019 (after implementation), the power consumption of the condensate pump is monthly average, the power consumption of the condensate pump is reduced by 985931 ten kilowatt hours in 2019, the power consumption of the condensate pump is reduced by 226.76 kilowatt hours on average, the power consumption of the condensate pump is calculated by 0.3949 kilowatt hours on the internet, 89.55 ten million yuan is saved by the two units, and the energy-saving effect is remarkable.
The current pairs of the condensate pump at different load sections before and after the implementation of the embodiment of the invention are shown in figure 1.
The condensate header pressure pairs for different load sections before and after the implementation of the embodiment of the invention are shown in FIG. 2.
The electricity consumption of the coagulation pump before and after the implementation of the embodiment of the invention is shown in figure 3.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (1)
1. The method for saving energy and reducing consumption of the condensate pump of the double reheating unit is characterized by comprising the following steps of:
(1) modifying the logic of an auxiliary regulating valve of the deaerator, and opening the auxiliary regulating valve to participate in the pressure regulation of the condensed water after the opening degree of a main regulating valve of the deaerator is larger than 70%, wherein the auxiliary regulating valve is gradually opened along with the increase of the opening degree of the main regulating valve, and the auxiliary regulating valve is also opened to 100% after the main regulating valve is fully opened;
(2) starting from the sealing water pressure of the water supply pump, which is the most main factor for restricting the reduction of the condensation water pressure, by reducing the condensation water pressure of each load section of 500MW-1000MW, recording the corresponding condensation water pressure value when the return water temperature of the sealing water of the water supply pump exceeds 60 ℃, taking the value as the lower limit of the condensation water pressure, re-making a 'load-condensation water pressure' curve, reducing the pressure of a condensation water bus pipe in normal operation, and reducing the power of the condensation water pump; the condensation water pressure is averagely reduced by 0.2-0.3MPa under the condition of not increasing a sealing water booster pump, the opening of a sealing water regulating valve of the water feeding pump is 30-40% in all load sections of 500MW-1000MW, the return water temperature of the sealing water of the water feeding pump is kept at a set value of 50 ℃, and the sealing effect is good;
(3) modifying logic that the variable-frequency condensate pump operates, the water level of a deaerator is less than 400mm, the difference value between the pressure of a main pipe at the outlet of the condensate pump and the pressure of the deaerator is less than 0.2MPa, and starting a standby pump in a combined mode; meanwhile, an alarm that the difference value between the condensed water pressure and the deaerator pressure is less than 0.3MPa and the condensed water pressure is low is added;
(4) and the logic that when the variable-frequency condensate pump is tripped and the standby power-frequency condensate pump is started jointly, the auxiliary regulating valve is closed in an interlocking manner, and the main regulating valve is automatically closed to the corresponding opening degree of the load according to the load is added.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113031681B (en) * | 2021-03-03 | 2022-04-15 | 江苏南通发电有限公司 | Condensation depth frequency conversion optimization method for thermal generator set |
| CN113464924A (en) * | 2021-07-27 | 2021-10-01 | 山西沃能化工科技有限公司 | Method for improving stability of boiler feed water |
| CN113790438B (en) * | 2021-08-06 | 2024-03-01 | 神华神东电力有限责任公司 | Method and device for switching operation mode of condensate system |
| 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 |
| CN114135478B (en) * | 2021-11-25 | 2024-02-13 | 国网河北能源技术服务有限公司 | Expected energy-saving effect evaluation method for variable frequency transformation of condensate pump of generator set |
| CN116447125B (en) * | 2023-04-11 | 2023-11-17 | 济南奔腾时代电力科技有限公司 | Optimization method for deeply reducing power consumption rate of condensate pump of thermal power generating unit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203404771U (en) * | 2013-07-12 | 2014-01-22 | 华北电力科学研究院(西安)有限公司 | Frequency converter and adjusting valve control system of condensate water system |
| CN107024883A (en) * | 2017-05-03 | 2017-08-08 | 中国神华能源股份有限公司 | Fired power generating unit load adjusting method and device and storage medium, processor |
| WO2019053803A1 (en) * | 2017-09-13 | 2019-03-21 | 中国電力株式会社 | Auxiliary power generation system and thermal power plant |
-
2020
- 2020-11-16 CN CN202011277014.XA patent/CN112361324B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203404771U (en) * | 2013-07-12 | 2014-01-22 | 华北电力科学研究院(西安)有限公司 | Frequency converter and adjusting valve control system of condensate water system |
| CN107024883A (en) * | 2017-05-03 | 2017-08-08 | 中国神华能源股份有限公司 | Fired power generating unit load adjusting method and device and storage medium, processor |
| WO2019053803A1 (en) * | 2017-09-13 | 2019-03-21 | 中国電力株式会社 | Auxiliary power generation system and thermal power plant |
Non-Patent Citations (2)
| Title |
|---|
| 凝结水泵变频控制策略优化及节能效果分析;鞠治杰等;《科技广场》;20130830(第08期);第54-57页 * |
| 除氧器水位控制的节能优化策略;戴锡辉等;《中国新技术新产品》;20170810(第15期);第106-107页 * |
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