CN111256192A - Comprehensive frequency modulation and peak regulation system of coal-fired power plant - Google Patents
Comprehensive frequency modulation and peak regulation system of coal-fired power plant Download PDFInfo
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- CN111256192A CN111256192A CN202010190255.4A CN202010190255A CN111256192A CN 111256192 A CN111256192 A CN 111256192A CN 202010190255 A CN202010190255 A CN 202010190255A CN 111256192 A CN111256192 A CN 111256192A
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- 230000033228 biological regulation Effects 0.000 title abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 95
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 238000009825 accumulation Methods 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 8
- 210000004907 gland Anatomy 0.000 claims description 4
- 230000004048 modification Effects 0.000 abstract description 5
- 238000012986 modification Methods 0.000 abstract description 5
- 239000003245 coal Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000005338 heat storage Methods 0.000 description 10
- 238000000605 extraction Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000010485 coping Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
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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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- Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The utility model provides a coal fired power plant comprehensive frequency modulation peak shaving system, including the heat accumulator, heat accumulator cold water pipeline, heat accumulator hot water pipeline, the condensate water return water pipeline, the condenser, the steam turbine, the generator that is connected with the steam turbine, the electric heat conversion equipment who is connected with the generator through transmission line, one side is connected with electric heat conversion equipment, the opposite side is through heat accumulation pipeline and heat accumulator cold water pipeline, the heat accumulation heater that heat accumulator hot water pipeline is connected, through heat release pipeline and heat accumulator cold water pipeline, the heat supply network heater that heat accumulator hot water pipeline is connected, the condensate pump, one end is connected with the condensate pump, the bearing seal heater that the other end is connected with the condensate water supply pipe, low pressure heater, the oxygen-eliminating. The invention can meet the peak regulation requirement of the coal-fired power plant, can also meet the frequency modulation requirement of a large power grid, can improve the utilization rate of the existing heat accumulator equipment, and obviously improves the flexibility of the coal-fired power plant. The method can be widely applied to flexible modification of coal-fired power plants.
Description
Technical Field
The invention relates to a comprehensive frequency modulation and peak regulation system of a coal-fired power plant, which can be widely applied to the flexible modification of the coal-fired power plant.
Background
Energy is the basis of human survival and development, along with the development of society and economy, the demand on energy is continuously increased, the development and the reasonable utilization of energy are more and more concerned by people, and meanwhile, a series of coping policies are formulated by the country, so that the coal-fired boiler for heating gradually exits from a historical stage. Therefore, a clean and green energy source for heat supply is urgently needed. Along with the adjustment of economic policies of China, power utilization structures are changed greatly, power consumption of light industry and municipal life is increased continuously, proportion of power consumption of heavy industry at night is reduced gradually, the day and night load peak-valley difference of a large power grid is increased to 30% -50% from 20% originally, and the day and night load peak-valley difference of the large power grid is increased to 50% -70% in developed countries. The existing energy structure is also obviously changed, the proportion of renewable energy sources such as wind energy, solar energy and the like is continuously improved, and the proportion of fossil energy sources is continuously reduced. Due to the nature of renewable energy sources, the large power grid is maintained to be stable and fall on the coal-fired power plant, and higher requirements are provided for the frequency modulation and peak regulation capacity of the coal-fired power plant.
Aiming at the problems, in 2016, 6 months and 7 months, the comprehensive department of the national energy and resource bureau respectively issues a notice of two batches of thermal power generating unit flexibility modification test point projects, and the comprehensive department relates to 22 units and 44 units of the power plant. At present, the peak regulation technology of the combined heat accumulator of the electrode boiler can only be applied to heating seasons, and a large number of heat accumulators are idle in non-heating seasons, so that resource waste is caused. In addition, the existing heat accumulator energy storage technology can only be used for peak shaving of a power plant, and cannot be used for meeting the requirement of large power grid frequency modulation.
Disclosure of Invention
The invention aims to provide a comprehensive frequency modulation and peak regulation system of a coal-fired power plant, which can meet the peak regulation requirement of the coal-fired power plant, can also meet the frequency modulation requirement of a large power grid, and can improve the utilization rate of the existing heat accumulator equipment and obviously improve the flexibility of the coal-fired power plant.
In order to achieve the aim, the comprehensive frequency modulation peak shaving system of the coal-fired power plant comprises a heat accumulator, a heat accumulator cold water pipeline arranged at the lower side of the heat accumulator, a heat accumulator hot water pipeline arranged at the upper side of the heat accumulator, a condensed water return pipeline connected with the heat accumulator cold water pipeline, a condenser connected with the condensed water return pipeline, a steam turbine connected with the condenser through a pipeline, a generator connected with the steam turbine, an electric heat conversion device connected with the generator through a power transmission line, a heat accumulation heater connected with the electric heat conversion device at one side and the heat accumulator cold water pipeline and the heat accumulator hot water pipeline at the other side through the heat accumulation pipeline, a heat network heater connected with the heat accumulator cold water pipeline and the heat accumulator hot water pipeline through a heat release pipeline, a condensed water pump connected with the condenser through a, The other end is connected with the gland seal heater that the condensate water supply pipe is connected, the low pressure feed water heater that one end is connected with the gland seal heater, the other end is connected with heat accumulator hot water pipeline, the oxygen-eliminating device that is connected with low pressure feed water heater through the pipeline, the water-feeding pump that is connected with the oxygen-eliminating device through the pipeline, the high pressure feed water heater that is connected with the water-feeding pump through the pipeline.
According to the comprehensive frequency modulation and peak regulation system of the coal-fired power plant, the heat supply network heater is a dividing wall type heater, and heat storage device hot water can be used for heating the heat supply network water.
According to the comprehensive frequency modulation and peak regulation system of the coal-fired power plant, the heat storage heater is a dividing wall type heater, and cold water in the heat storage can be heated by the electric heat conversion device.
The invention relates to a comprehensive frequency modulation and peak regulation system of a coal-fired power plant, wherein an electric heat conversion device is an electrode boiler, a heat pump, an electromagnetic boiler or a resistance boiler.
The invention relates to a comprehensive frequency modulation and peak regulation system of a coal-fired power plant, which has the following frequency modulation working principle:
when the power grid frequency needs to be improved, the water quantity of a condensate pump is kept unchanged, so that the liquid level of the condenser is kept stable, condensate at the outlet of the shaft seal heater sequentially passes through a condensate water supply pipeline and a heat accumulator cold water pipeline and is conveyed to a heat accumulator, and meanwhile, hot water of the heat accumulator is conveyed to the outlet of the low-pressure heater through a heat accumulator hot water pipeline, so that the liquid level of the deaerator is kept stable. At this time, the amount of condensed water flowing through the low pressure heater is reduced, the water side temperature is raised, the steam side saturation temperature and pressure are also raised, so that the extraction pressure difference is reduced, the extraction steam amount is reduced, and the reduced extraction steam amount flows through the steam turbine to increase the output electric power.
When the frequency of a power grid needs to be reduced, the water quantity of a condensate pump is increased, and the condensate water at the outlet of the low-pressure heater is conveyed to the heat accumulator through a heat accumulator hot water pipeline, so that the liquid level of the deaerator is kept stable. Meanwhile, cold water of the heat accumulator is conveyed to the condenser through a cold water pipeline and a condensed water return pipeline of the heat accumulator in sequence, so that the liquid level of the condenser is kept stable. At this time, the amount of condensed water flowing through the low pressure heater increases, the water side temperature decreases, the steam side saturation temperature and pressure also decrease, the extraction pressure difference increases, the extraction steam amount increases, and the steam amount flowing through the steam turbine decreases, so that the output electric power thereof decreases.
The invention relates to a comprehensive frequency modulation and peak regulation system of a coal-fired power plant, which has the peak regulation working principle that:
when the unit needs peak regulation, the electric heat conversion device consumes the electric energy sent by the power transmission line, the cold water is heated by the heat storage heater, the cold water is heated and then is conveyed back to the heat storage device through the heat storage device hot water pipeline, the heat storage device stores heat, at the moment, the electric heat conversion device consumes the electricity generated by the generator, and the electric quantity of the unit on the internet is reduced. When the unit does not need peak regulation, hot water of the heat accumulator passes through a hot water pipeline and a heat release pipeline of the heat accumulator, and is conveyed to the heat accumulator through a cold water pipeline of the heat accumulator after being heated by a heat supply network heater, the heat accumulator releases heat, and the temperature of the heat supply network water is increased for heating.
The invention relates to a comprehensive frequency modulation and peak regulation system of a coal-fired power plant, wherein an electric heat conversion device is an electrode boiler, a heat pump, an electromagnetic boiler or a resistance boiler, and is equipment for converting electric energy into heat energy.
The comprehensive frequency modulation and peak regulation system of the coal-fired power plant can partially or completely utilize the electricity generated by the generator according to the peak regulation requirement.
The invention relates to a comprehensive frequency modulation peak regulation system of a coal-fired power plant, wherein a heat accumulator is a heat accumulation device which is based on the layering principle of water and takes water as a heat accumulation medium. The heat accumulator heats water upwards, and a water distributor is arranged in the heat accumulator; the cold water is arranged below the water distributor; the middle is a thermocline.
According to the comprehensive frequency modulation peak regulation system of the coal-fired power plant, by means of the self-balancing capacity of the heater of the regenerative system, when the amount of condensed water is reduced, the temperature of the water side is increased, the saturation temperature and pressure of the steam side are also increased, so that the steam extraction pressure difference is reduced, the steam extraction amount is reduced, and the reduced steam extraction amount flows through the steam turbine to increase the output electric rate; when the flow of the condensed water is increased, the conditions are just opposite, and the output electric power is reduced, thereby achieving the purpose of frequency modulation. The thermoelectric decoupling can be realized by utilizing the thermoelectric conversion device to consume the generator to generate electricity during peak shaving time, the electric quantity of the on-line power is reduced, meanwhile, the heat accumulator stores heat, the peak shaving purpose is achieved, and the flexibility of the coal-fired power plant is obviously improved by utilizing the heat accumulator to supply heat during non-peak shaving time.
In conclusion, the comprehensive frequency modulation and peak regulation system for the coal-fired power plant can meet the peak regulation requirement of the coal-fired power plant, can also meet the frequency modulation requirement of a large power grid, and can improve the utilization rate of the existing heat accumulator equipment and obviously improve the flexibility of the coal-fired power plant.
Drawings
The invention will be further described with reference to the accompanying drawings and examples thereof.
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
In fig. 1, the comprehensive frequency modulation peak shaving system of the coal-fired power plant of the invention comprises a heat accumulator 1, a heat accumulator cold water pipeline 2 arranged at the lower side of the heat accumulator, a heat accumulator hot water pipeline 3 arranged at the upper side of the heat accumulator, a condensed water return pipeline 4 connected with the heat accumulator cold water pipeline, a condenser 5 connected with the condensed water return pipeline, a steam turbine 6 connected with the condenser 3 through a pipeline, a generator 7 connected with the steam turbine, an electric heat conversion device 8 connected with the generator through a transmission line, a heat accumulation heater 9 connected with the electric heat conversion device at one side and the heat accumulator cold water pipeline and the heat accumulator hot water pipeline at the other side through a heat accumulation pipeline 17, a heat network heater 10 connected with the cold water heat accumulator pipeline and the hot water pipeline through a heat release pipeline 18, and a condensed water pump 11 connected, a shaft seal heater 12 with one end connected with the condensate pump and the other end connected with a condensate water supply pipeline 19, a low-pressure heater 13 with one end connected with the shaft seal heater and the other end connected with a heat accumulator hot water pipeline, a deaerator 14 connected with the low-pressure heater through a pipeline, a water supply pump 15 connected with the deaerator through a pipeline, and a high-pressure heater 16 connected with the water supply pump through a pipeline.
According to the comprehensive frequency modulation and peak regulation system of the coal-fired power plant, the heat supply network heater is a dividing wall type heater, and heat storage device hot water can be used for heating the heat supply network water.
According to the comprehensive frequency modulation and peak regulation system of the coal-fired power plant, the heat storage heater is a dividing wall type heater, and cold water in the heat storage can be heated by the electric heat conversion device.
The invention relates to a comprehensive frequency modulation and peak regulation system of a coal-fired power plant, wherein an electric heat conversion device is an electrode boiler, a heat pump, an electromagnetic boiler or a resistance boiler.
In fig. 1, a grid water inlet a and a grid water outlet b are shown.
In view of the foregoing, while the preferred embodiments of the present invention have been described, it is to be understood that the invention is not limited to the precise embodiments described above, and that equipment and structures not described in detail are understood to be practiced in a manner that is conventional in the art; any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention by those skilled in the art can be made without departing from the technical scope of the present invention, and still fall within the protection scope of the technical solution of the present invention.
Claims (4)
1. The comprehensive frequency modulation peak shaving system of the coal-fired power plant is characterized by comprising a heat accumulator, a heat accumulator cold water pipeline arranged on the lower side of the heat accumulator, a heat accumulator hot water pipeline arranged on the upper side of the heat accumulator, a condensed water return pipeline connected with the heat accumulator cold water pipeline, a condenser connected with the condensed water return pipeline, a steam turbine connected with the condenser through a pipeline, a generator connected with the steam turbine, an electric heat conversion device connected with the generator through a power transmission line, a heat accumulation heater connected with the electric heat conversion device on one side and the heat accumulator cold water pipeline and the heat accumulator hot water pipeline on the other side through the heat accumulation pipeline, a heat network heater connected with the heat accumulator cold water pipeline and the heat accumulator hot water pipeline through a heat release pipeline, a condensed water pump connected with the condenser through a pipeline, a, The other end is connected with the gland seal heater that the condensate water supply pipe is connected, the low pressure feed water heater that one end is connected with the gland seal heater, the other end is connected with heat accumulator hot water pipeline, the oxygen-eliminating device that is connected with low pressure feed water heater through the pipeline, the water-feeding pump that is connected with the oxygen-eliminating device through the pipeline, the high pressure feed water heater that is connected with the water-feeding pump through the pipeline.
2. The system of claim 1, wherein the heat supply network heater is a dividing wall heater capable of heating the heat supply network water by using the hot water of the heat accumulator.
3. The system of claim 1, wherein the thermal storage heater is a dividing wall heater capable of heating cold water in the thermal storage by an electric heat converter.
4. The system according to claim 1, wherein the electric-to-heat converter is an electrode boiler, a heat pump, an electromagnetic boiler or a resistance boiler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010190255.4A CN111256192B (en) | 2020-03-18 | 2020-03-18 | Comprehensive frequency modulation peak regulation system for coal-fired power plant |
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| CN202010190255.4A CN111256192B (en) | 2020-03-18 | 2020-03-18 | Comprehensive frequency modulation peak regulation system for coal-fired power plant |
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| CN111256192B CN111256192B (en) | 2024-02-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112344317A (en) * | 2020-10-23 | 2021-02-09 | 广西投资集团北海发电有限公司 | Condensed water frequency modulation device with heat storage system |
| WO2022011903A1 (en) * | 2020-07-16 | 2022-01-20 | 西安热工研究院有限公司 | Boiler wet water recovery system under low load of coal-fired unit and working method |
| CN114607479A (en) * | 2022-03-17 | 2022-06-10 | 西安热工研究院有限公司 | Energy storage peak shaving system for recovering waste heat of thermal power system of thermal power plant |
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2020
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022011903A1 (en) * | 2020-07-16 | 2022-01-20 | 西安热工研究院有限公司 | Boiler wet water recovery system under low load of coal-fired unit and working method |
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| CN114607479A (en) * | 2022-03-17 | 2022-06-10 | 西安热工研究院有限公司 | Energy storage peak shaving system for recovering waste heat of thermal power system of thermal power plant |
| CN114607479B (en) * | 2022-03-17 | 2023-11-07 | 西安热工研究院有限公司 | Energy storage peak regulation system for recovering waste heat of thermal power plant thermodynamic system |
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