CN115341964B - Thermal power generating unit heat storage peak shaving power generation system and method with desalting water tank - Google Patents
Thermal power generating unit heat storage peak shaving power generation system and method with desalting water tank Download PDFInfo
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- CN115341964B CN115341964B CN202211041402.7A CN202211041402A CN115341964B CN 115341964 B CN115341964 B CN 115341964B CN 202211041402 A CN202211041402 A CN 202211041402A CN 115341964 B CN115341964 B CN 115341964B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 190
- 238000005338 heat storage Methods 0.000 title claims abstract description 60
- 238000011033 desalting Methods 0.000 title claims abstract description 49
- 238000010248 power generation Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000001105 regulatory effect Effects 0.000 claims abstract description 80
- 238000000605 extraction Methods 0.000 claims abstract description 48
- 238000010612 desalination reaction Methods 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims description 38
- 238000009833 condensation Methods 0.000 claims description 9
- 230000005494 condensation Effects 0.000 claims description 8
- 238000009825 accumulation Methods 0.000 claims 1
- 238000004146 energy storage Methods 0.000 abstract description 9
- 230000004044 response Effects 0.000 abstract description 5
- 230000001276 controlling effect Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 10
- 238000011161 development Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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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
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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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Water Supply & Treatment (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a thermal power generating unit heat storage peak shaving power generation system and method with a desalting water tank, wherein the system comprises the following components: the device comprises a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator, a condenser, 3 high-pressure regenerators, 4 low-pressure regenerators, a deaerator, a shaft seal heater, a condensate pump and a water supply pump; the heat storage device arranged in the system comprises a second regulating valve, a third regulating valve, a cold water tank, a fifth regulating valve, a fourth regulating valve, a first conveying pump, a desalination water tank, a sixth regulating valve, a second conveying pump and a check valve. The system provided by the invention can work in an energy release mode and an energy storage mode, can control the steam extraction quantity of the steam exhaust pipeline of the medium pressure cylinder, and achieves the aim of controlling the output power of the generator set; the response capability of the supercritical thermal power generating unit to the power grid load fluctuation can be improved, and the deep peak shaving capability can be improved.
Description
Technical Field
The invention belongs to the technical field of peak regulation and frequency modulation of thermal power units, and particularly relates to a thermal power unit heat storage peak regulation power generation system and method with a desalting water tank.
Background
In recent years, new energy power generation technology is rapidly developed worldwide, and the renewable energy duty ratio is continuously improved, but new problems are correspondingly generated; the new energy power generation has poor stability influenced by natural resources, climate endowment and the like, the load fluctuation is large, and the peak regulation capability caused by electric heating contradiction and the like in a heat supply period is limited, so that the health and sustainable development of renewable energy sources are restricted. Related researches are sequentially carried out all over the world, so that the common wind abandoning phenomenon is solved, the peak shaving flexibility of the thermoelectric unit is improved, and huge economic and social benefits are realized.
The heat storage peak regulation technology at the present stage is complementary with distributed wind power, distributed photovoltaic, distributed combustion engine, thermal power and the like, so that the heat storage peak regulation technology occupies small area, is flexible in operation and scheduling, is concerned, and mainly solves the technical problems that the existing technology comprises:
(1) On the premise of economic benefit and social benefit, peak shaving requirements are adapted under the existing auxiliary service policy, and the running flexibility of the unit is improved;
(2) Combining the heat supply capacity and the heat supply network load analysis, and how to configure and optimize the optimal capacities of the heat storage tank and the electric boiler by an electric and heat price mechanism;
(3) The method is characterized by exploring and promoting the system to consume renewable energy sources and building a back press in a central heating system to have influence on heat supply.
In summary, the flexibility of the current power system is weak, and the wind-heat conflict is seriously restricted by the rapid development of new energy, so that the thermal power generating unit power generation system based on heat storage and peak shaving is needed to be provided.
Disclosure of Invention
The invention aims to provide a thermal power generating unit heat storage peak shaving power generation system and method with a desalting water tank, so as to solve one or more technical problems. According to the thermal power generating unit, the desalting water tank is added to serve as a heat storage device, so that the response capability of the thermal power generating unit to the power grid load fluctuation can be improved, and the unit operation flexibility can be improved.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The invention provides a thermal power generating unit heat storage peak shaving power generation system with a desalting water tank, which comprises: the boiler comprises a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator, a condenser, a No. 1 high-pressure heat regenerator, a No. 2 high-pressure heat regenerator, a No. 3 high-pressure heat regenerator, a No. 5 low-pressure heat regenerator, a No. 6 low-pressure heat regenerator, a No. 7 low-pressure heat regenerator, a No. 8 low-pressure heat regenerator, a deaerator, a shaft seal heater, a condensate pump, a cold water tank and a desalination water tank; the high-heating regenerator 1, the high-heating regenerator 2 and the high-heating regenerator 3 are sequentially connected in series, and the low-heating regenerator 5, the low-heating regenerator 6, the low-heating regenerator 7 and the low-heating regenerator 8 are sequentially connected in series;
The superheated steam outlet of the boiler is communicated with the main steam inlet of the high-pressure cylinder, the hot reheat steam outlet of the boiler is communicated with the hot reheat steam inlet of the medium-pressure cylinder, and the water supply port of the boiler is communicated with the water storage outlet of the No.1 high-pressure heat regenerator;
a section of steam extraction port of the high-pressure cylinder is communicated with a steam inlet of the No. 1 high-pressure heat regenerator, and a steam discharge port of the high-pressure cylinder is communicated with a steam inlet of the No. 2 high-pressure heat regenerator and a cold reheat steam inlet of the boiler;
The three-section steam extraction ports of the medium pressure cylinder are communicated with the steam inlet of the No. 3 high-pressure heat regenerator, the four-section steam extraction ports of the medium pressure cylinder are communicated with the steam inlet of the deaerator, the five-section steam extraction ports of the medium pressure cylinder are communicated with the steam inlet of the No. 5 low-pressure heat regenerator, and the steam outlet of the medium pressure cylinder is communicated with the steam inlet of the low pressure cylinder; the No. 5 low-heating regenerator is communicated with an inlet of the deaerator through a condensation pipeline;
The exhaust port of the low-pressure cylinder is communicated with the steam inlet of the condenser, the six-section steam extraction port of the low-pressure cylinder is communicated with the steam inlet of the No. 6 low-adding heat regenerator, the seven-section steam extraction port of the low-pressure cylinder is communicated with the steam inlet of the No. 7 low-adding heat regenerator, and the eight-section steam extraction port of the low-pressure cylinder is communicated with the steam inlet of the No. 8 low-adding heat regenerator;
the condensation water of the condenser is divided into two paths through a condensation water pump, one path of the condensation water is communicated with an inlet of the shaft seal heater through a first regulating valve, and an outlet of the shaft seal heater is communicated with the No. 8 low-heating regenerator; the other path is divided into a cold water tank pipeline and a desalination water tank pipeline after passing through a second regulating valve; the cold water tank pipeline is provided with a third regulating valve and is communicated with the inlet of the cold water tank, and the salt removal water tank pipeline is provided with a fourth regulating valve and is communicated with the inlet of the salt removal water tank; the outlet of the cold water tank is communicated with the condensed water pipeline through a fifth regulating valve and a first delivery pump, and the outlet of the desalination water tank is communicated with the condensed water pipeline through a sixth regulating valve and a second delivery pump.
A further development of the invention consists in that the condensate line is provided with a non-return valve.
A further improvement of the invention is that the boiler is a once-through boiler.
A further development of the invention consists in that the high-pressure cylinder, the medium-pressure cylinder, the low-pressure cylinder and the generator are arranged coaxially.
A further improvement of the invention is that the number of the desalination water tanks is one or more.
The invention provides a thermal power generating unit heat storage peak shaving power generation method provided with a desalting water tank, which is based on any one of the thermal power generating unit heat storage peak shaving power generation systems provided with the desalting water tank;
In the thermal power generating unit heat storage peak shaving power generation method provided with the desalting water tank, when the power grid load is in a trough, the thermal power generating unit is in a heat storage peak shaving operation mode; and when the power grid load is at the peak, the power grid load is in an energy release operation mode.
In the heat storage peak shaving operation mode, the first regulating valve, the second regulating valve, the fourth regulating valve, the fifth regulating valve and the first water delivery pump are in an open state; the third regulating valve, the sixth regulating valve and the second delivery pump are in a closed state.
A further development of the invention consists in that in the energy release operating mode, the first control valve is in a partially closed state; the second regulating valve, the third regulating valve, the sixth regulating valve and the second conveying pump are in an opening state; the fourth regulating valve, the fifth regulating valve and the first water delivery pump are in a closed state.
Compared with the prior art, the invention has the following beneficial effects:
The invention particularly provides a system for improving the peak regulation capacity of a thermal power unit by an improved heat storage device, which can improve the peak regulation capacity of the thermal power unit when a power grid is in high load and low load; specifically explanatory, the invention is used for storing low-temperature condensed water from the outlet of the condensed water pump or gradually conveying hot water in the desalting water tank to the condensed water pipeline through the desalting water tank outlet conveying pump by adding the desalting water tank as a heat storage device.
In the method provided by the invention, under the energy release mode and the energy storage mode, the control of the steam extraction quantity of the steam exhaust pipeline of the medium pressure cylinder can be realized, and the purpose of controlling the output power of the generator set is achieved; the response capability of the supercritical thermal power generating unit to the power grid load fluctuation can be improved, and the deep peak shaving capability can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description of the embodiments or the drawings used in the description of the prior art will make a brief description; it will be apparent to those of ordinary skill in the art that the drawings in the following description are of some embodiments of the invention and that other drawings may be derived from them without undue effort.
Fig. 1 is a schematic diagram of a thermal power generating unit heat storage peak shaving power generation system provided with a desalting water tank according to an embodiment of the invention;
In the figure, 1, a condensate pump; 2. a first regulating valve; 3. a shaft seal heater; 4. a second regulating valve; 5. a third regulating valve; 6. a fourth regulating valve; 7. a cold water tank; 8. a fifth regulating valve; 9. a first transfer pump; 10. a non-return valve; 11. a water feed pump; 12. a first desalination water tank; 13. a second desalination water tank; 14. a sixth regulating valve; 15. a second transfer pump; 16. a boiler; 17. a high-pressure cylinder; 18. a medium pressure cylinder; 19. a low pressure cylinder; 20. a generator; 21. a condenser; 22. an oxygen remover.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the attached drawing figures:
Referring to fig. 1, a thermal power generating unit heat storage peak shaving power generation system with a desalting water tank provided by an embodiment of the invention includes: the boiler 16, the high-pressure cylinder 17, the medium-pressure cylinder 18, the low-pressure cylinder 19, the generator 20, the condenser 21, 3 high-heating regenerators, 4 low-heating regenerators, the deaerator 22, the shaft seal heater 3, the condensate pump 1 and the feed pump 11; the heat storage device includes a second regulating valve 4, a third regulating valve 5, a cold water tank 7, a fifth regulating valve 8, a fourth regulating valve 6, a first transfer pump 9, a desalination water tank (which may include a first desalination water tank 12 and a second desalination water tank 13; in addition, the number thereof may be plural), a sixth regulating valve 14, a second transfer pump 15, and a check valve 10.
In the embodiment of the invention, a high-pressure cylinder 17, a medium-pressure cylinder 18, a low-pressure cylinder 19 and a generator 20 are sequentially and coaxially connected, 3 high-heating regenerators are sequentially connected, 4 low-heating regenerators are sequentially connected, and a tail end low-heating regenerator is connected with a shaft seal heater 3;
The boiler 16 is illustratively a once-through boiler; the superheated steam outlet of the once-through boiler is connected to the main steam inlet of the high-pressure cylinder 17, the hot reheat steam outlet of the once-through boiler is connected to the hot reheat steam inlet of the medium-pressure cylinder 18, the water supply port of the once-through boiler is connected to the water storage outlet of the No. 1 high-pressure regenerator, the steam exhaust port of the high-pressure cylinder 17 is respectively connected to the cold reheat steam of the once-through boiler and the steam inlet of the No. 2 high-pressure regenerator, and one section of steam exhaust port of the high-pressure cylinder 17 is connected to the steam inlet of the No. 1 high-pressure regenerator; the three-section steam extraction port of the medium pressure cylinder 18 is connected to the steam inlet of the No. 3 high-pressure heat regenerator, the four-section steam extraction port of the medium pressure cylinder 18 is connected to the steam inlet of the deaerator 22, the five-section steam extraction port of the medium pressure cylinder 18 is connected to the steam inlet of the No. 5 low-pressure heat regenerator and the steam inlet of the heat regenerator, and the steam outlet of the medium pressure cylinder 18 is connected to the steam inlet of the low pressure cylinder 19; the steam outlet of the low-pressure cylinder 19 is connected to the steam inlet of the condenser 21, the six-section steam extraction port of the low-pressure cylinder 19 is connected to the steam inlet of the No. 6 low-adding heat regenerator, the seven-section steam extraction port of the low-pressure cylinder 19 is connected to the steam inlet of the No. 7 low-adding heat regenerator, and the eight-section steam extraction port of the low-pressure cylinder 19 is connected to the steam inlet of the No. 8 low-adding heat regenerator; the condensed water of the condenser 21 is divided into three paths through the outlet of the condensed water pump 1, wherein one path is connected to the inlet of the shaft seal heater 3, the other path is connected to the first water inlet of the cold water tank 7, and the three paths are respectively connected to the first desalting water tank 12 and the second desalting water tank 13. The outlets of the first desalting water tank 12 and the second desalting water tank 13 are connected with the outlet of the check valve 10 of the condensed water pipeline at the inlet of the deaerator 22; the outlet of the cold water tank 7 is used for conveying low-temperature desalted water to the inlet of a check valve 10 of a condensate pipeline under the action of a first conveying pump 9; the water outlet of the desalination water tank is connected to the water inlet pipeline of the deaerator 22, and the check valve 10 is arranged on the pipeline, so that backflow is effectively prevented.
The water outlet of the condensate pump 1 is connected to a first regulating valve 2 on a water inlet pipeline of the deaerator 22, the water outlet of the condensate pump 1 is connected to a second regulating valve 4 on a first water inlet pipeline of the desalting water tank, a third regulating valve 5 is arranged on a water inlet pipeline of the condensate pump 1, the water outlet of the condensate pump 1 is connected to a desalting water tank, a fourth regulating valve 6 is arranged on a water inlet pipeline of the condensate pump 1, a fifth regulating valve 8 is arranged on a water outlet pipeline of the condensate pump 7, a sixth regulating valve 14 is arranged on a water inlet pipeline of the deaerator 22, and a water outlet of the desalting water tank is connected to a water inlet pipeline of the deaerator 22.
The embodiment of the invention provides a thermal power generating unit heat storage peak regulation power generation method provided with a desalination water tank, which is based on the thermal power generating unit heat storage peak regulation power generation system provided with the desalination water tank and comprises the following steps:
the heat storage device (the desalination water tank) of the thermal power generating unit heat storage peak shaving power generation system provided with the desalination water tank is used for improving the peak shaving capacity of the thermal power generating unit, and the heat storage device has two operation modes according to the load state of a power grid, namely a heat storage peak shaving operation mode and an energy release operation mode; when the power grid load is at a peak, the heat storage device is in an energy release operation mode; when the power grid load is in the trough, the energy storage device is in a heat storage peak shaving operation mode.
In the embodiment of the invention, under the heat storage peak shaving operation mode, the steam extraction amount from the medium pressure cylinder 18 to the desalination water tank is increased, at the moment, the cold water tank 7 is opened through the valve opening of the fifth regulating valve 8, and the low-temperature cooling water is conveyed to the pipeline of the No. 5 low-heating regenerator through the first conveying pump 9, so that the liquid level height of the desalination water tank is increased; the sixth regulating valve 14 is in a closed state, and as the steam extraction amount of the steam turbine increases, the power generation and the work of the steam turbine are reduced, and the temperature of the desalted water in the desalted water tank gradually increases until the energy storage process is finished. Specifically explanatory, the valve opening of the fifth regulating valve 8 is opened in the heat storage process, and the cooled desalted water is sent to the deaerator 22 through the first delivery pump 9, so that the steam extraction amount from one section of steam extraction to four sections of steam extraction is increased, and the acting capacity of the high-pressure cylinder 18 and the medium-pressure cylinder 18 is reduced.
In the embodiment of the invention, in the energy release operation mode, the power grid is at high load, the thermal power generating unit needs to improve the working capacity of the thermal power generating unit, the heat storage device is converted into the energy release operation mode, hot water in the demineralized water tank is conveyed to the low-condensation water adding pipeline through the action of the sixth regulating valve 14 and the second conveying pump 15, and the sixth regulating valve 14 and the second conveying pump 15 are in an open state. In the energy release operation mode, the second regulating valve 4 is in an open state, and because the temperature of the condensed water at the outlet of the condensed water pump 1 is lower, in order to improve the working capacity of the thermal power generating unit, the steam extraction amount of the thermal power generating unit needs to be reduced, so that the condensed water pump 1 is in a partially closed state to the first regulating valve 2, the flow of the condensed water entering the low heat exchanger is reduced, the flow of five-section steam extraction to eight-section steam extraction is reduced, the water temperature in the demineralized water tank is gradually reduced as the condensed water at low temperature is gradually increased in the cold water tank 7, and the energy release process is finished.
In the energy release operation mode, the five-section steam extraction to the regulating valve of the heat regenerator, the regulating valve of the water outlet of the heat regenerator to the demineralized water tank and the drainage conveying pump are in a closed state, so that the five-section steam extraction flow is reduced, the steam inlet flow of the low-pressure cylinder 19 is further improved, and the acting capacity of the low-pressure cylinder 19 is improved; on the other hand, because the desalted water with higher temperature is conveyed to the low-pressure condensate pipeline through the desalted water tank water outlet conveying pump, the water inlet temperature of each low-pressure heat exchanger is improved, the flow of five sections of steam extraction to eight sections of steam extraction is reduced, the work of steam in the low-pressure cylinder 19 is further improved, and the output power of the thermal power unit is increased when the power grid is under high load.
Based on the technical scheme provided by the embodiment of the invention, when the power grid is in high load and low load, the peak regulation and frequency modulation capacity of the thermal power generating unit is improved; the desalting water tank is added to serve as a heat storage device and is used for storing low-temperature condensed water from an outlet of the condensed water pump or gradually conveying hot water in the desalting water tank to a condensed water pipeline through a desalting water tank water outlet conveying pump, so that the control of the steam extraction quantity of a steam exhaust pipeline of the medium-pressure cylinder is realized, the purpose of controlling the output power of a generator set is achieved, and the response capability of the supercritical thermal power unit to the power grid load fluctuation is improved; the heat energy occupies a larger proportion in the application form of the energy terminal, the heat storage is used as a tie for connecting the heat energy and the electric energy for conversion, the heat storage has good peak regulation characteristics, and the rigid constraint of the thermal power unit in heat fixation is broken; and the grid connection of clean energy sources such as wind power is promoted, so that when the thermal power unit is in response to low load, the thermal power unit with the adjusting capability is lower than the minimum technical output, and the deep peak regulation capability is improved.
According to the thermal power generating unit heat storage peak shaving power generation method provided by the embodiment of the invention, the source load supply and demand contradiction of a power grid is further aggravated due to the continuous increase of the installed capacity of new energy and the continuous decrease of load acceleration, so that the peak shaving problem is more remarkable. The load of the power grid is always positioned at the peak and trough positions, the heat storage device is used for improving the peak regulating capacity of the thermal power generating unit, and the heat storage device has two operation modes according to the load state of the power grid, namely a heat storage peak regulating operation mode and an energy releasing operation mode. When the power grid load is at the peak, the heat storage device is in an energy release operation mode; when the power grid load is in the trough, the energy storage device is in a heat storage peak shaving operation mode.
The thermal power generating unit heat storage peak regulation power generation system provided with the desalting water tank is in a heat storage peak regulation operation mode. In the heat storage peak regulation operation mode, the steam extraction amount from the steam extraction pipeline of the medium pressure cylinder 18 to the desalination water tank is increased, the sixth regulating valve 14 and the second conveying pump 15 are in a closed state, the fourth regulating valve 6 is in an open state, and the liquid levels of the first desalination water tank 12 and the second desalination water tank 13 are increased; the third regulating valve 5 is in a closed state, the fifth regulating valve 8 and the first delivery pump 9 are in an open state, low-temperature desalted water is delivered to the water inlet pipeline of the deaerator 22 through the first delivery pump 9, the temperature of the condensed water at the inlet of the deaerator 22 is reduced, the extraction amount from one extraction to four extraction is increased, and the work of steam in the steam turbine is reduced. Due to the fact that the steam extraction amount from the steam outlet of the medium-pressure cylinder 18 to the desalting water tank is increased, the steam inlet flow entering the low-pressure cylinder 19 is reduced, the acting capacity of the thermal power unit is further reduced when the power grid is in low load, and the deep peak regulation capacity of the unit is improved.
The thermal power generating unit heat storage peak shaving power generation system with the desalting water tank is in a gradual energy release operation mode. When the power grid is in a high load state, the working capacity of the thermal power unit needs to be improved, the heat storage device is converted into an energy release operation mode, hot water in the demineralized water tank is conveyed to a low-heating condensate pipeline through the sixth regulating valve 14 and the second conveying pump 15, the first regulating valve 2 is in a partially closed state, the third regulating valve 5 and the sixth regulating valve 14 are in an open state, the fourth regulating valve 6 and the fifth regulating valve 8 are in a closed state, and as the temperature of condensate water at the outlet of the condensate pump 1 is lower, the extraction volume of the thermal power unit needs to be reduced in order to improve the working capacity of the thermal power unit, so that the condensate water pump 1 is in a partially closed state to ensure that the condensate water flow entering the low-heating heat exchanger is reduced, the flow from five sections of extraction steam to eight sections of extraction steam is reduced, and the water temperature in the cold water tank 7 is gradually reduced along with the gradual increase of the low-temperature condensate water in the cold water tank 7. On the other hand, because the desalted water with higher temperature is conveyed to the low-pressure condensation water pipeline through the sixth regulating valve 14 and the second conveying pump 15, the water inlet temperature of the low-pressure heat exchanger is increased, the flow of five sections of extraction steam to eight sections of extraction steam is reduced, the work of steam in the low-pressure cylinder 19 is further improved, the output power of the thermal power generating unit is increased when the power grid is under high load, and the energy release process is finished.
Referring to table 1, in the two operation modes of the heat storage peak regulation operation mode and the energy release operation mode, the operation states of the main valve groups and the equipment of the system are in order to cope with the large change of the load of the power grid, and the corresponding adjustment strategies of the valve groups and the equipment of the system are as follows.
TABLE 1 operating states of the main valve set and the device of the system in two operating modes
In the embodiment of the invention, the technical scheme of the invention is further supplemented by the following by combining data examples:
(1) Heat storage peak shaving operation mode:
before the energy storage peak shaving mode starts, the first desalting water tank 12 and the second desalting water tank 13 respectively store about 1300t of cold water, and the water temperature is 35.5 ℃ on average; the condensed water storage tank is full of 500t of cold water.
After the energy storage peak regulation mode is started, extracting exhaust steam of the medium-pressure cylinder 18 to directly enter the first desalting water tank 12 and the second desalting water tank 13, and heating the water to 95 ℃; spray ports are added in the first desalting water tank 12 and the second desalting water tank 13, and steam and desalting water are directly mixed, so that vibration excitation is prevented.
In order to keep the balance of the working medium of the system and further excavate the peak shaving depth, when the medium-pressure cylinder 18 is extracted to exhaust steam, cold water of a condensed water storage tank is conveyed to a condensed water pipeline at the inlet of the deaerator 22 by a pump, and the steam extraction quantity of four sections of extracted steam is increased; wherein, the calculation data of the energy storage process are shown in table 2.
TABLE 2 calculation data of energy storage process
Based on the table 2, in the energy release mode, when the front load of the unit is 105MW and the peak shaving time length is 2 hours, the steam extraction amount x is increased by 120t/h, so that the load of the unit can be reduced to 89MW, the peak shaving load variation reaches 16MW, the peak shaving load rate of the unit is reduced to 29.6% after auxiliary peak shaving, and the deep peak shaving capacity of the unit is improved.
(2) Gradual energy release mode:
The sixth regulating valve 14 and the second delivery pump 15 of the first desalting water tank 12 and the second desalting water tank 13 are started, and hot water in the desalting water tank is pumped into a condensed water pipeline at the inlet of the deaerator 22; at the same time, the condensed water from the condensed water pipeline at the outlet of the condensed water pump 1 is continuously supplemented with the cold water tank 7, the first desalination water tank 12 and the second desalination water tank 13; wherein the step-wise energy release process calculation data is as shown in Table 3
TABLE 3 gradual energy release process calculation data
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (8)
1. A thermal power generating unit heat accumulation peak shaving power generation system equipped with a desalting water tank, which is characterized by comprising: the boiler comprises a boiler (16), a high-pressure cylinder (17), a medium-pressure cylinder (18), a low-pressure cylinder (19), a generator (20), a condenser (21), a No. 1 high-heating regenerator, a No. 2 high-heating regenerator, a No. 3 high-heating regenerator, a No. 5 low-heating regenerator, a No. 6 low-heating regenerator, a No. 7 low-heating regenerator, a No. 8 low-heating regenerator, a deaerator (22), a shaft seal heater (3), a condensate pump (1), a cold water tank (7) and a desalination water tank; the high-heating regenerator 1, the high-heating regenerator 2 and the high-heating regenerator 3 are sequentially connected in series, and the low-heating regenerator 5, the low-heating regenerator 6, the low-heating regenerator 7 and the low-heating regenerator 8 are sequentially connected in series;
The superheated steam outlet of the boiler (16) is communicated with the main steam inlet of the high-pressure cylinder (17), the hot reheat steam outlet of the boiler (16) is communicated with the hot reheat steam inlet of the medium-pressure cylinder (18), and the water supply port of the boiler (16) is communicated with the water storage outlet of the No.1 high-pressure heat regenerator;
A section of steam extraction port of the high-pressure cylinder (17) is communicated with a steam inlet of the No.1 high-pressure heat regenerator, and a steam discharge port of the high-pressure cylinder (17) is communicated with a steam inlet of the No. 2 high-pressure heat regenerator and a cold reheat steam inlet of the boiler (16);
The three-section steam extraction port of the medium pressure cylinder (18) is communicated with the steam inlet of the No. 3 high-pressure heat regenerator, the four-section steam extraction port of the medium pressure cylinder (18) is communicated with the steam inlet of the deaerator (22), the five-section steam extraction port of the medium pressure cylinder (18) is communicated with the steam inlet of the No. 5 low-pressure heat regenerator, and the steam outlet of the medium pressure cylinder (18) is communicated with the steam inlet of the low pressure cylinder (19); the No. 5 low-heating regenerator is communicated with an inlet of the deaerator (22) through a condensation pipeline;
The exhaust port of the low-pressure cylinder (19) is communicated with the steam inlet of the condenser (21), the six-section steam extraction port of the low-pressure cylinder (19) is communicated with the steam inlet of the No. 6 low-heating regenerator, the seven-section steam extraction port of the low-pressure cylinder (19) is communicated with the steam inlet of the No. 7 low-heating regenerator, and the eight-section steam extraction port of the low-pressure cylinder (19) is communicated with the steam inlet of the No. 8 low-heating regenerator;
the condensation water of the condenser (21) is divided into two paths through a condensation water pump (1), one path is communicated with the inlet of the shaft seal heater (3) through a first regulating valve (2), and the outlet of the shaft seal heater (3) is communicated with the No. 8 low-heating regenerator; the other path is divided into a cold water tank (7) pipeline and a desalination water tank pipeline after passing through a second regulating valve (4); the pipeline of the cold water tank (7) is provided with a third regulating valve (5) and is communicated with the inlet of the cold water tank (7), and the pipeline of the desalination water tank is provided with a fourth regulating valve (6) and is communicated with the inlet of the desalination water tank; the outlet of the cold water tank (7) is communicated with the condensed water pipeline through a fifth regulating valve (8) and a first delivery pump (9), and the outlet of the desalination water tank is communicated with the condensed water pipeline through a sixth regulating valve (14) and a second delivery pump (15).
2. Thermal power generating unit heat storage peak shaving power generating system with desalting water tank according to claim 1, characterized in that a check valve (10) is arranged on the condensed water pipeline.
3. Thermal power generating unit heat storage and peak shaving power generating system with desalting water tank as claimed in claim 1, wherein the boiler (16) is a once-through boiler.
4. The thermal power generating unit heat storage and peak shaving power generation system provided with a desalting water tank according to claim 1, wherein the high-pressure cylinder (17), the medium-pressure cylinder (18), the low-pressure cylinder (19) and the generator (20) are coaxially arranged.
5. The thermal power generating unit heat storage and peak shaving power generation system provided with desalting water tanks according to claim 1, wherein the number of the desalting water tanks is one or more.
6. A thermal power generating unit heat storage peak shaving power generation method provided with a desalting water tank, which is characterized in that the thermal power generating unit heat storage peak shaving power generation system provided with the desalting water tank is based on any one of claims 1 to 5;
In the thermal power generating unit heat storage peak shaving power generation method provided with the desalting water tank, when the power grid load is in a trough, the thermal power generating unit is in a heat storage peak shaving operation mode; and when the power grid load is at the peak, the power grid load is in an energy release operation mode.
7. The thermal power generating unit heat storage and peak shaving power generation method with the desalting water tank according to claim 6, wherein in the heat storage and peak shaving operation mode, a first regulating valve (2), a second regulating valve (4), a fourth regulating valve (6), a fifth regulating valve (8) and a first conveying pump (9) are in an open state; the third regulating valve (5), the sixth regulating valve (14) and the second delivery pump (15) are in a closed state.
8. The thermal power generating unit heat storage and peak shaving power generation method with a desalting water tank according to claim 6, wherein in the energy release operation mode, the first regulating valve (2) is in a partially closed state; the second regulating valve (4), the third regulating valve (5), the sixth regulating valve (14) and the second delivery pump (15) are in an open state; the fourth regulating valve (6), the fifth regulating valve (8) and the first delivery pump (9) are in a closed state.
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