CN115341964A - Thermal power generating unit heat storage peak regulation power generation system and method with desalting water tank - Google Patents
Thermal power generating unit heat storage peak regulation power generation system and method with desalting water tank Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 194
- 238000005338 heat storage Methods 0.000 title claims abstract description 60
- 238000011033 desalting Methods 0.000 title claims abstract description 38
- 238000010248 power generation Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000001105 regulatory effect Effects 0.000 claims abstract description 65
- 238000000605 extraction Methods 0.000 claims abstract description 46
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 238000004146 energy storage Methods 0.000 abstract description 9
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- 230000001276 controlling effect Effects 0.000 abstract description 3
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- 238000004364 calculation method Methods 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004458 analytical method Methods 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
- 238000010612 desalination reaction Methods 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
- 230000006872 improvement Effects 0.000 description 1
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- 230000035939 shock Effects 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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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
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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 thermal power generating unit heat storage peak regulation power generation system and method with a desalting water tank, wherein the system comprises: the system comprises a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator, a condenser, 3 high-heating regenerators, 4 low-heating regenerators, a deaerator, a shaft seal heater, a condensate pump and a feed 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 delivery pump, a demineralized water tank, a sixth regulating valve, a second delivery pump and a check valve. The system provided by the invention can work in an energy release mode and an energy storage mode, can realize the control of the steam extraction quantity of the steam exhaust pipeline of the intermediate pressure cylinder, and achieves the purpose of controlling the output power of the generator set; the response capability of the supercritical thermal power generating unit to power grid load fluctuation can be improved, and the deep peak regulation capability can be improved.
Description
Technical Field
The invention belongs to the technical field of peak regulation and frequency modulation of thermal power generating units, and particularly relates to a thermal power generating 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 in the world, the proportion of renewable energy is continuously improved, but new problems are generated correspondingly; the renewable energy is restricted to be healthy and continuously developed due to the fact that the new energy power generation is influenced by natural resources, weather, endowments and the like, stability is poor, load fluctuation is large, and peak regulation capacity caused by electric heating contradiction in a heating period is limited. Related researches are successively carried out all over the world, and the problems of common wind abandonment are solved, the flexibility of peak regulation of the thermoelectric generator set is improved, and great economic benefits 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 has the advantages of small occupied area, flexible operation and scheduling, attention, and the remaining technical problems mainly include:
(1) On the premise of economic benefit and social benefit, the peak regulation requirement is adapted under the existing auxiliary service policy, and the operation flexibility of the unit is improved;
(2) By combining the heat supply capacity and heat supply network load analysis and an electricity and heat price mechanism, how to configure and optimize the optimal capacity of a heat storage tank and an electric boiler;
(3) The method is used for exploring and promoting the system to consume renewable energy sources, and has influence on building a back pressure machine in a centralized heating system to supply heat.
In summary, at present, the flexibility of an electric power system is weak, wind-heat conflict caused by rapid development of new energy severely restricts sustainable development of energy, and a thermal power generating unit power generation system based on heat storage and peak shaving needs to be provided urgently.
Disclosure of Invention
The invention aims to provide a thermal power generating unit heat storage peak regulation power generation system and method with a desalting water tank, and aims to solve one or more technical problems. According to the invention, the desalting water tank is added as the 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 operation flexibility of the thermal power generating unit can be improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a thermal power generating unit heat storage peak regulation power generation system with a desalting water tank, which comprises: the system comprises a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator, a condenser, 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, a shaft seal heater, a condensate pump, a cold water tank and a demineralized water tank; the No. 1 high-heat regenerator, the No. 2 high-heat regenerator and the No. 3 high-heat regenerator are sequentially communicated in series, and the No. 5 low-heat regenerator, the No. 6 low-heat regenerator, the No. 7 low-heat regenerator and the No. 8 low-heat regenerator are sequentially communicated in series;
a superheated steam outlet of the boiler is communicated to a main steam inlet of the high-pressure cylinder, a hot reheat steam outlet of the boiler is communicated to a hot reheat steam inlet of the intermediate-pressure cylinder, and a water feeding port of the boiler is communicated to a water storage outlet of the No. 1 high-pressure heater;
a steam extraction port of one section of the high-pressure cylinder is communicated with a steam inlet of the No. 1 high-pressure reheater, and a steam exhaust port of the high-pressure cylinder is communicated with a steam inlet of the No. 2 high-pressure reheater and a cold reheat steam inlet of the boiler;
three-section steam extraction ports of the intermediate pressure cylinder are communicated with a steam inlet of the No. 3 high-pressure heater, four-section steam extraction ports of the intermediate pressure cylinder are communicated with a steam inlet of the deaerator, five-section steam extraction ports of the intermediate pressure cylinder are communicated with a steam inlet of the No. 5 low-pressure heater, and a steam exhaust port of the intermediate pressure cylinder is communicated with a steam inlet of the low-pressure cylinder; the No. 5 low-heating heat regenerator is communicated with an inlet of the deaerator through a condensed water pipeline;
the steam outlet 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-heating reheater, the seven-section steam extraction port of the low pressure cylinder is communicated with the steam inlet of the No. 7 low-heating reheater, and the eight-section steam extraction port of the low pressure cylinder is communicated with the steam inlet of the No. 8 low-heating reheater;
the condensed water of the condenser is divided into two paths by a condensed water pump, wherein one path is communicated to the inlet of the shaft seal heater through a first regulating valve, and the outlet of the shaft seal heater is communicated with the No. 8 low-heating heat regenerator; the other path of the water pipe is divided into a cold water tank pipeline and a demineralized water tank pipeline after passing through a second regulating valve; the cold water tank pipeline is provided with a third regulating valve and communicated with an inlet of the cold water tank, and the demineralized water tank pipeline is provided with a fourth regulating valve and communicated with an inlet of the demineralized 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 demineralized water tank is communicated with the condensed water pipeline through a sixth regulating valve and a second delivery pump.
The invention is further improved in that a check valve is arranged on the condensed water pipeline.
A further development of the invention is that the boiler is a once-through boiler.
The present invention is further improved in that the high pressure cylinder, the intermediate pressure cylinder, the low pressure cylinder, and the generator are coaxially arranged.
The invention is further improved in that the number of the desalting water tanks is one or more.
The invention provides a thermal power generating unit heat storage peak regulation power generation method with a desalting water tank, which is based on any thermal power generating unit heat storage peak regulation power generation system with a desalting water tank;
in the thermal power generating unit heat storage peak shaving power generation method with the desalting water tank, when the load of a power grid is in a wave trough, the thermal power generating unit is in a heat storage peak shaving operation mode; and when the load of the power grid is at a peak, the energy releasing operation mode is adopted.
The invention has the further improvement that in the heat storage peak regulation 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 opening state; and the third regulating valve, the sixth regulating valve and the second delivery pump are in a closed state.
In a further development of the invention, in the energy-releasing operating mode, the first regulating valve is in a partially closed state; the second regulating valve, the third regulating valve, the sixth regulating valve and the second delivery 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 generating unit by using an improved heat storage device, which can improve the peak regulation and frequency modulation capacity of the thermal power generating unit when a power grid is under high load and low load; specifically, the invention adds a demineralized water tank as a heat storage device for storing low-temperature condensed water from an outlet of a condensed water pump or gradually conveys hot water in the demineralized water tank to a condensed water pipeline through an outlet water conveying pump of the demineralized water tank.
In the method provided by the invention, the control on the steam extraction quantity of the steam exhaust pipeline of the intermediate pressure cylinder can be realized in the energy release mode and the energy storage mode, so that the aim of controlling the output power of the generator set is fulfilled; the response capability of the supercritical thermal power generating unit to power grid load fluctuation can be improved, and the deep peak regulation 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 drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of a thermal power generating unit heat storage peak shaving power generation system 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 delivery pump; 10. a check valve; 11. a feed pump; 12. a first demineralized water tank; 13. a second demineralized water tank; 14. a sixth regulating valve; 15. a second delivery pump; 16. a boiler; 17. a high pressure cylinder; 18. an intermediate pressure cylinder; 19. a low pressure cylinder; 20. a generator; 21. a condenser; 22. a deaerator.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Moreover, 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 accompanying drawings:
referring to fig. 1, a thermal power generating unit heat storage peak shaving power generation system configured with a desalination water tank according to an embodiment of the present invention includes: the system comprises a boiler 16, a high-pressure cylinder 17, an intermediate-pressure cylinder 18, a low-pressure cylinder 19, a generator 20, a condenser 21, 3 high-heating regenerators, 4 low-heating regenerators, a deaerator 22, a shaft seal heater 3, a condensate pump 1 and a 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 demineralized water tank (which may include a first demineralized water tank 12 and a second demineralized water tank 13; alternatively, 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, an intermediate-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;
boiler 16 is an exemplary optional once-through boiler; a superheated steam outlet of the once-through boiler is connected to a main steam inlet of the high pressure cylinder 17, a hot reheat steam outlet of the once-through boiler is connected to a hot reheat steam inlet of the intermediate pressure cylinder 18, a water supply port of the once-through boiler is connected to a water storage outlet of the No. 1 high-pressure reheater, a steam exhaust port of the high pressure cylinder 17 is respectively connected to a cold reheat steam of the once-through boiler and a steam inlet of the No. 2 high-pressure reheater, and a section of steam extraction port of the high pressure cylinder 17 is connected to a steam inlet of the No. 1 high-pressure reheater; a three-section steam extraction port of the intermediate pressure cylinder 18 is connected to a steam inlet of a No. 3 high-pressure heater regenerator, a four-section steam extraction port of the intermediate pressure cylinder 18 is connected to a steam inlet of a deaerator 22, a five-section steam extraction port of the intermediate pressure cylinder 18 is connected to a steam inlet of a No. 5 low-pressure heater regenerator and a steam inlet of a regenerator, and a steam exhaust port of the intermediate pressure cylinder 18 is connected to a steam inlet of a low-pressure cylinder 19; the steam exhaust port 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-heating reheater, the seven-section steam extraction port of the low-pressure cylinder 19 is connected to the steam inlet of the No. 7 low-heating reheater, and the eight-section steam extraction port of the low-pressure cylinder 19 is connected to the steam inlet of the No. 8 low-heating reheater; the condensed water of the condenser 21 is divided into three paths through the outlet of the condensed water pump 1, 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 a check valve 10 of an inlet condensed water pipeline of a deaerator 22; an outlet of the cold water tank 7 conveys low-temperature desalted water to an inlet of a check valve 10 of a condensed water pipeline under the action of a first conveying pump 9; the water outlet of the desalting 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 delivery port of condensate pump 1 is connected to and is provided with first governing valve 2 on the water inlet pipeline of oxygen-eliminating device 22, be provided with second governing valve 4 on the first water inlet pipeline that condensate pump 1's delivery port is connected to the demineralized water tank, the delivery port of condensate pump 1 is connected to and is provided with third governing valve 5 on the water inlet pipeline of cold water tank 7, be provided with fourth governing valve 6 on the water inlet pipeline that condensate pump 1's delivery port is connected to the demineralized water tank, be provided with fifth governing valve 8 on 7 delivery ports of cold water tank are connected to No. 5 low water outlet pipes, demineralized water tank delivery port is connected to and is provided with sixth governing valve 14 on the 22 water inlet pipeline of oxygen-eliminating device.
The embodiment of the invention provides a thermal power generating unit heat storage peak regulation power generation method with a desalting water tank, and the thermal power generating unit heat storage peak regulation power generation system with the desalting water tank based on the method comprises the following steps:
the heat storage device (demineralized water tank) of the thermal power unit heat storage peak regulation power generation system with the demineralized water tank is used for improving the peak regulation capacity of the thermal power unit, and the heat storage device has two operation modes, namely a heat storage peak regulation operation mode and an energy release operation mode according to the load state of a power grid; when the load of the power grid is at a peak, the heat storage device is in an energy release operation mode; when the load of the power grid is in the wave valley, the energy storage device is in a heat storage peak regulation operation mode.
In the embodiment of the invention, in the heat storage peak regulation operation mode, the steam extraction amount from the intermediate pressure cylinder 18 to the demineralized water tank is increased, at the moment, the valve opening degree of the cold water tank 7 is opened through the fifth regulating valve 8, the low-temperature cooling water is conveyed to the No. 5 low-heating regenerator pipeline through the first conveying pump 9, and the liquid level height of the demineralized water tank is increased; the sixth regulating valve 14 is in a closed state, the power generation work of the steam turbine is reduced along with the increase of the steam extraction amount of the steam turbine, and the temperature of the demineralized water in the demineralized water tank is gradually increased until the energy storage process is finished. Specifically, in the heat storage process, the opening degree of the valve of the fifth regulating valve 8 is opened, and the cooled desalted water is sent to the deaerator 22 through the first transfer pump 9, so that the steam extraction amount from one-stage steam extraction to four-stage steam extraction is increased, and the work capacity of the high and medium pressure cylinders 18 is reduced.
In the embodiment of the invention, in the energy release operation mode, the power grid is in a high load state, the thermal power generating unit needs to improve the work capacity, the heat storage device is converted into the energy release operation mode, hot water in the demineralized water tank conveys the demineralized water with higher temperature to the low condensed water adding pipeline under 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 releasing operation mode, the second regulating valve 4 is in an open state, and because the temperature of condensed water at the outlet of the condensed water pump 1 is lower, the steam extraction capacity of the thermal power generating unit needs to be reduced for improving the work doing capability of the thermal power generating unit, the water outlet of the condensed water pump 1 to the first regulating valve 2 is in a partial closed state, so that the flow of the condensed water entering the low-pressure heat exchanger is reduced, the flow from five-section steam extraction to eight-section steam extraction is reduced, and the water temperature in the demineralized water tank is gradually reduced along with the gradual increase of the low-temperature condensed water in the cold water tank 7 until the energy releasing process is finished.
In the energy release operation mode, the five-section steam extraction to the heat regenerator regulating valve, the heat regenerator water outlet to the demineralized water tank regulating valve and the drainage delivery pump are in a closed state, so that the flow of the five-section steam extraction is reduced, the steam inlet flow of the low-pressure cylinder 19 is further improved, and the work doing capacity of the low-pressure cylinder 19 is improved; on the other hand, because the high-temperature demineralized water is conveyed to the low condensation water adding pipeline through the demineralized water tank outlet water conveying pump, the water inlet temperature of each low condensation heat exchanger is increased, the flow rate from five-section steam extraction to eight-section 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 generating unit is increased when the power grid is in high load.
Based on the technical scheme provided by the embodiment of the invention, when the power grid is under high load and low load, the peak-load and frequency-modulation capacity of the thermal power generating unit is improved; the desalting water tank is added as a heat storage device and is used for storing low-temperature condensed water from an outlet of a condensed water pump or gradually conveying hot water in the desalting water tank to a condensed water pipeline through a desalting water tank outlet water conveying pump, so that the control of the steam extraction quantity of a steam exhaust pipeline of the intermediate pressure cylinder is realized, the purpose of controlling the output power of the generator set is achieved, and the response capability of the supercritical thermal power generating 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 link for connecting the heat energy and the electric energy conversion, the heat storage has good peak regulation characteristic, and the rigid constraint of the thermal power generating unit for fixing the electricity by heat is broken; the grid connection of clean energy such as wind power and the like is promoted, so that when the thermal power generating unit deals with low load, the thermal power generating unit with the regulation capacity is lower than the minimum technical output, and the deep peak regulation capacity is improved.
According to the thermal power generating unit heat storage peak regulation 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 the load acceleration, so that the peak regulation problem is more and more prominent. The load of a power grid is usually positioned at the wave crest and the wave trough, the heat storage device is used for improving the peak regulation 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 regulation operation mode and an energy release operation mode. When the load of the power grid is at a wave crest, the heat storage device is in an energy release operation mode; when the load of the power grid is in the wave valley, the energy storage device is in a heat storage peak regulation operation mode.
The load of a power grid is in a trough, and a thermal power generating unit heat storage peak regulation power generation system provided with a desalting water tank is in a heat storage peak regulation operation mode. In the heat storage and peak regulation operation mode, the steam extraction amount from the steam extraction pipeline of the intermediate pressure cylinder 18 to the demineralized water tank is increased, the sixth regulating valve 14 and the second delivery pump 15 are in a closed state, the fourth regulating valve 6 is in an open state, and the liquid levels of the first demineralized water tank 12 and the second demineralized water tank 13 are increased; third governing valve 5 is in the closed condition, and fifth governing valve 8 and first delivery pump 9 are in the open mode, and microthermal demineralized water is carried to oxygen-eliminating device 22 water inlet pipeline through first delivery pump 9, has reduced the temperature of 22 entry condensate waters of oxygen-eliminating device, and the steam extraction volume of taking out to four takes out increases, has reduced the doing work of steam in the steam turbine. Due to the fact that the steam extraction amount from the steam outlet of the intermediate pressure cylinder 18 to the demineralized water tank is increased, the steam inlet flow of steam entering the low pressure cylinder 19 is reduced, the working capacity of the thermal power generating unit is further reduced when the power grid is in low load, and the deep peak regulation capacity of the thermal power generating unit is improved.
The load of a power grid is at a wave crest, and the thermal power generating unit heat storage peak regulation power generation system provided 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 generating unit needs to be improved at the moment, the heat storage device is converted into an energy release operation mode, hot water in the demineralized water tank is conveyed to the low condensation water adding pipeline through the sixth adjusting valve 14 and the second conveying pump 15, the first adjusting valve 2 is in a partial closing state at the moment, the third adjusting valve 5 and the sixth adjusting valve 14 are in an opening state, the fourth adjusting valve 6 and the fifth adjusting valve 8 are in a closing state, and the steam extraction amount of the thermal power generating unit needs to be reduced for improving the working capacity of the thermal power generating unit due to the fact that the temperature of condensed water at the outlet of the condensed water pump 1 is lower, so that the water outlet of the condensed water pump 1 to the first adjusting valve 2 is in a partial closing state, the flow of the condensed water entering the low condensation heat exchanger is reduced, the flow of steam extracted from a fifth section to an eighth section is reduced, and the water temperature in the cold water tank 7 is gradually reduced along with the gradually increased low-temperature condensed water. On the other hand, as the demineralized water with higher temperature is conveyed to the low condensing water pipeline through the sixth regulating valve 14 and the second conveying pump 15, the water inlet temperature of the low condensing heat exchanger is increased, the flow rate from the five-section steam extraction to the eight-section steam extraction is reduced, the work of steam in the low-pressure cylinder 19 is further increased, and the output power of the thermal power generating unit is increased when the power grid is in high load until the energy release process is finished.
Referring to table 1, in order to cope with the large change of the load of the power grid, the operation states of the main valve banks and the main equipment of the system in the two operation modes of the heat storage peak shaving operation mode and the energy releasing operation mode according to the embodiment of the present invention are as follows.
TABLE 1 operating states of main valve set and equipment of system in two operating modes
In the embodiment of the present invention, the technical solution of the present invention is further described as follows by combining with a data example:
(1) Heat storage peak regulation 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 averagely 35.5 ℃; the condensed water storage tank is full of 500t of cold water.
After the energy storage peak regulation mode is started, extracting the exhaust steam of the intermediate pressure cylinder 18 and directly entering the first desalting water tank 12 and the second desalting water tank 13 to heat the water to 95 ℃; a shower opening is added to the first and second demineralized water tanks 12 and 13, and the steam and the demineralized water are directly mixed, and care should be taken to prevent shock excitation.
In order to keep the balance of the working medium of the system and further dig the peak regulation depth, cold water in a condensed water storage tank is conveyed to a condensed water pipeline at the inlet of a deaerator 22 by a pump while the exhaust steam of the intermediate pressure cylinder 18 is extracted, and the steam extraction amount of four-stage steam extraction is increased; the energy storage process calculation data is shown in table 2.
TABLE 2 energy storage Process calculation data
Based on table 2 shows, in the energy release mode, when the current load of the unit is 105MW, and the peak shaving duration is 2 hours, the extraction steam 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 the auxiliary peak shaving, and the deep peak shaving capability 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 tanks is pumped into a condensed water pipeline at the inlet of a deaerator 22; meanwhile, the condensed water cold water from the condensed water pipeline at the outlet of the condensed water pump 1 continuously replenishes the cold water tank 7, the first desalting water tank 12 and the second desalting water tank 13; wherein, the calculation data of the step-by-step energy release process is shown in Table 3
TABLE 3. Step by step release Process calculation data
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (8)
1. The utility model provides a thermal power generating unit heat-retaining peak shaving power generation system of configuration demineralized water jar which characterized in that includes: the system comprises a boiler (16), a high-pressure cylinder (17), an intermediate-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 demineralized water tank; the No. 1 high-heat regenerator, the No. 2 high-heat regenerator and the No. 3 high-heat regenerator are sequentially communicated in series, and the No. 5 low-heat regenerator, the No. 6 low-heat regenerator, the No. 7 low-heat regenerator and the No. 8 low-heat regenerator are sequentially communicated in series;
a superheated steam outlet of the boiler (16) is communicated to a main steam inlet of the high-pressure cylinder (17), a hot reheat steam outlet of the boiler (16) is communicated to a hot reheat steam inlet of the intermediate-pressure cylinder (18), and a water feeding port of the boiler (16) is communicated to a water storage outlet of the No. 1 high-pressure heater regenerator;
a section of steam extraction port of the high-pressure cylinder (17) is communicated to a steam inlet of the No. 1 high-pressure heater regenerator, and a steam outlet of the high-pressure cylinder (17) is communicated to a steam inlet of the No. 2 high-pressure heater regenerator and a cold reheat steam inlet of the boiler (16);
the three-section steam extraction port of the intermediate pressure cylinder (18) is communicated with the steam inlet of the No. 3 high-pressure heater regenerator, the four-section steam extraction port of the intermediate pressure cylinder (18) is communicated with the steam inlet of the deaerator (22), the five-section steam extraction port of the intermediate pressure cylinder (18) is communicated with the steam inlet of the No. 5 low-pressure heater regenerator, and the steam exhaust port of the intermediate 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 condensed water pipeline;
a steam exhaust port of the low-pressure cylinder (19) is communicated with a steam inlet of the condenser (21), a six-section steam extraction port of the low-pressure cylinder (19) is communicated with a steam inlet of the No. 6 low-addition heat regenerator, a seven-section steam extraction port of the low-pressure cylinder (19) is communicated with a steam inlet of the No. 7 low-addition heat regenerator, and an eight-section steam extraction port of the low-pressure cylinder (19) is communicated with a steam inlet of the No. 8 low-addition heat regenerator;
condensed water of the condenser (21) is divided into two paths by a condensed water pump (1), wherein one path is communicated to an inlet of the shaft seal heater (3) by a first regulating valve (2), and an outlet of the shaft seal heater (3) is communicated with the No. 8 low-heating heat regenerator; the other path is divided into a cold water tank (7) pipeline and a demineralized 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 demineralized water tank is provided with a fourth regulating valve (6) and is communicated with the inlet of the demineralized 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 demineralized water tank is communicated with the condensed water pipeline through a sixth regulating valve (14) and a second delivery pump (15).
2. The thermal power generating unit heat storage peak-shaving power generation system provided with a desalted water tank as claimed in claim 1, wherein a check valve (10) is arranged on the condensed water pipeline.
3. The thermal power generating unit heat storage peak shaving power generation system with the desalted 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 with a desalted water tank as claimed in claim 1, wherein said high pressure cylinder (17), said intermediate pressure cylinder (18), said low pressure cylinder (19) and said generator (20) are coaxially arranged.
5. The thermal power generating unit heat storage peak regulation power generation system provided with a desalting water tank as claimed in claim 1, wherein the number of the desalting water tank is one or more.
6. A thermal power generating unit heat storage peak regulation power generation method provided with a desalting water tank is characterized in that the thermal power generating unit heat storage peak regulation 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 with the desalting water tank, when the load of a power grid is in a wave trough, the thermal power generating unit is in a heat storage peak shaving operation mode; and when the load of the power grid is at a peak, the energy releasing operation mode is adopted.
7. The thermal power generating unit heat storage and peak shaving power generation method configured with a desalted water tank is characterized in that 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 delivery 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 peak-shaving power generation method configured with a demineralized water tank as claimed in claim 6, characterized in that 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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