CN114215619A - Energy storage power generation system for enhancing deep peak regulation capability of coal-fired unit - Google Patents
Energy storage power generation system for enhancing deep peak regulation capability of coal-fired unit Download PDFInfo
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- 239000003546 flue gas Substances 0.000 claims abstract description 11
- 238000003303 reheating Methods 0.000 claims description 38
- 239000007789 gas Substances 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 22
- 239000000498 cooling water Substances 0.000 claims description 14
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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
- F01K13/00—General layout or general methods of operation of complete plants
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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
- F01D15/08—Adaptations for driving, or combinations with, pumps
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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
- F01D17/105—Final actuators by passing part of the fluid
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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
- 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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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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
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
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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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/14—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having both steam accumulator and heater, e.g. superheating accumulator
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
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Abstract
The invention discloses an energy storage power generation system for enhancing deep peak regulation capacity of a coal-fired unit, and relates to the technical field of compressed air energy storage; the invention utilizes the steam produced by the coal-fired boiler more at night to drive the compressor to store energy, stores the compressed air in the air storage device, and utilizes the steam or the flue gas of the boiler to heat the compressed air to generate electricity in the daytime; on the premise of keeping the power generation output of the original coal-fired steam turbine generator set unchanged at night, more steam produced by the boiler is used for dragging the back-pressure steam turbine to store energy, so that the load of the boiler is improved, various accidents caused by insufficient load of the boiler are avoided, and the deep peak shaving capacity of the coal-fired unit is improved; in the peak period of power utilization in the daytime, the compressed air energy storage system can be used for generating power, and the total power generation capacity of the original coal-fired generator set is increased, so that the peak power generation capacity of the generator set in the peak period of power utilization is stronger.
Description
Technical Field
The invention relates to the technical field of compressed air energy storage, in particular to an energy storage power generation system for enhancing the deep peak shaving capacity of a coal-fired unit.
Background
At present, in the aspect of a newly-added power installation structure, the proportion of new energy reaches 60%, the proportion of thermal power is reduced to 40%, and the trend of replacing fossil energy with clean energy is irreversible. In addition, the operation mode of the power utilization end of the power grid is also changed profoundly, the power generation load and the power utilization load tend to be fluctuating, random and unpredictable, especially in recent years, the peak-to-valley difference of the power utilization load in the daytime and at night of the power grid is larger and larger, most areas in China exceed 50%, and local areas reach more than 60%. Under the severe situation of peak-to-valley difference, the regulation of the power load of the power grid from the peak period to the valley period is almost all borne by the conventional coal-fired power generating set and the energy storage power generating set, and particularly the conventional coal-fired power generating set bears the main task of deep peak regulation.
As described above, the current trend that the peak regulation of the power grid depends on the thermal power generating unit only at night is more and more obvious, and the load of the coal-fired power generating unit is reduced at one step in the valley period of the power grid, so that the utilization rate of the thermal power generating unit is reduced, the power generation coal consumption is increased, great energy waste is formed, and the service life of the peak regulation unit is greatly damaged. The existing province shows the situation that the output of a coal-fired generating set is reduced to 30 percent of rated load at night and in holidays, and even has the extreme requirement of shutdown and peak shaving.
When the peak shaving depth of the coal-fired generating set is carried out, the main limiting factor influencing the peak shaving depth capability is the load reduction capability of the coal-fired boiler, and along with the reduction of the load of the generating set, the boiler has accidents of unstable combustion, failure of a denitration catalyst, instability of hydrodynamic force and the like which influence the safe and stable operation of the boiler. Generally speaking, the lowest safe and stable operation load of a large boiler is not less than 40%, and the lowest safe and stable operation load can reach 30% through related deep peak regulation technical transformation.
Based on the current situation, in order to utilize the steam which is produced by the coal-fired boiler more at night to drag the compressor to store energy, the compressed air is stored in the air storage device, and the steam or the flue gas of the boiler is utilized to heat the compressed air to generate electricity at daytime; on the premise of keeping the power generation output of the original coal-fired steam turbine generator set unchanged at night, more steam is generated by the boiler to be used for dragging the back-pressure steam turbine to store energy, so that the load of the boiler is improved, various accidents caused by insufficient load of the boiler are avoided, and the deep peak shaving capacity of the coal-fired unit is improved; in the peak period of electricity utilization in the daytime, the compressed air energy storage system can be used for generating electricity, so that the total power generation capacity of the original coal-fired generator set is increased, and the peak power generation capacity of the generator set in the peak period of electricity utilization is stronger; and provides an energy storage power generation system for enhancing the deep peak regulation capability of a coal-fired unit.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an energy storage power generation system for enhancing the deep peak shaving capacity of a coal-fired unit.
In order to achieve the purpose, the invention adopts the following technical scheme:
an energy storage power generation system for enhancing the deep peak regulation capability of a coal-fired unit comprises an energy storage power generation system and a control method for controlling the energy storage power generation system;
the energy storage power generation system comprises a coal-fired power generation module, a steam turbine compressed air energy storage module, a circulating cooling water module, a reheating type air turbine power generation module, a gas-gas heat exchanger module, a gas storage module, a valve control module, a central control module, a back pressure type steam turbine steam inlet control valve and a heating steam inlet valve;
the turbine compressed air energy storage module and the reheating type air turbine power generation module work in a time-sharing mode.
Preferably, the coal-fired power generation module is used for inputting high-temperature and high-pressure steam produced by the coal-fired boiler into the steam turbine, detecting the working state of the steam turbine, and controlling the engagement of the clutch according to the working state detection data of the steam turbine to drive the generator to work.
Preferably, the steam turbine compressed air energy storage module controls a pipeline led out from a reheat steam pipeline of a boiler in the coal-fired power generation module, the reheat steam is input into the back pressure steam turbine, and the back pressure steam turbine drives the multistage compressor to compress air.
Preferably, the reheating type air turbine power generation module is used for guiding steam or flue gas generated by a boiler in the coal-fired power generation unit module to the gas storage module, heating high-pressure compressed air in the gas storage module, and conveying the heated high-pressure compressed air to the reheating type air turbine power generator for expansion and work.
Preferably, the circulating cooling water module is used for cooling the compression heat generated by the multi-stage compressor in the air compression process, controlling the cooling water to enter the heat exchanger, and inputting the heated cooling water into a power plant heating power network for utilization.
Preferably, the gas-gas heat exchanger module is used for conveying steam or flue gas in a boiler to the gas storage module and heating compressed air discharged by the gas storage module; the gas storage module is used for storing compressed air exhausted by the turbine compressed air energy storage module and controlling the compressed air in the gas storage module to exhaust and absorb heat of steam or flue gas guided by the reheating type air turbine power generation module.
Preferably, the central control module is used for controlling each module of the whole system; the valve control module is used for controlling the back pressure type steam turbine steam inlet control valve and the heating steam inlet valve, and the back pressure type steam turbine steam inlet control valve and the heating steam inlet valve perform feedback control on the steam turbine compressed air energy storage module and the reheating type air turbine power generation module.
Preferably, the control method is as follows:
at night or in a power grid valley period, the central control module controls the valve control module to close the heating steam inlet valve, the back pressure type steam turbine steam inlet control valve is opened, and the central control module controls the compressed air energy storage module of the steam turbine to start working;
the steam turbine compressed air energy storage module leads the reheated steam of the boiler to the back pressure steam turbine so that the back pressure steam turbine expands to work;
the back pressure steam turbine doing work through expansion drags the multistage compressor to compress air, and finally the compressed air is guided to the air storage module to be stored;
in the daytime or in the peak of the power grid, the central control module controls the valve control module to open the heating steam inlet valve, the back pressure type steam turbine steam inlet control valve is closed, and the central control module controls the reheating type air turbine power generation module to start working;
the reheating type air turbine power generation module guides the reheating steam to the heat exchanger, so that the reheating steam heats the high-pressure compressed air stored in the air storage module, the high-pressure compressed air is changed into high-temperature and high-pressure air with expansion work capability, and the air is guided to the reheating type air turbine power generation module to be expanded and work.
Compared with the prior art, the invention has the beneficial effects that:
1. by using the whole system and combining the control method, the load rate of the boiler is improved, the limitation of the deep peak shaving capacity of the coal-fired generator set by the load rate of the boiler is avoided, and the power generation capacity of the coal-fired generator set is improved.
2. The invention utilizes the steam produced by the coal-fired boiler more at night to drive the compressor to store energy, stores the compressed air in the air storage device, and utilizes the steam or the flue gas of the boiler to heat the compressed air to generate electricity in the daytime; on the premise of keeping the generated power of the original coal-fired steam turbine generator set unchanged at night, more steam produced by the boiler is used for dragging the back-pressure steam turbine to store energy, so that the load of the boiler is increased, various accidents caused by insufficient load of the boiler are avoided, and the deep peak regulation capacity of the coal-fired unit is improved; in the peak period of electricity utilization in the daytime, the compressed air energy storage system can be used for generating electricity, and the total generating capacity of the original coal-fired generating set is increased, so that the peak generating capacity of the generating set in the peak period of electricity utilization is stronger.
Drawings
FIG. 1 is a schematic diagram of an energy storage and power generation system for enhancing deep peak shaving capability of a coal-fired unit according to the present invention;
fig. 2 is a flowchart of a control method of the energy storage power generation system for enhancing the deep peak shaving capability of the coal-fired unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Referring to fig. 1-2, an energy storage power generation system for enhancing deep peak shaving capability of a coal-fired unit comprises an energy storage power generation system and a control method for controlling the energy storage power generation system;
the energy storage power generation system comprises a coal-fired power generation module, a steam turbine compressed air energy storage module, a circulating cooling water module, a reheating type air turbine power generation module, a gas-gas heat exchanger module, a gas storage module, a valve control module, a central control module, a back pressure type steam turbine steam inlet control valve and a heating steam inlet valve;
the turbine compressed air energy storage module and the reheating type air turbine power generation module work in a time-sharing mode.
The coal-fired power generation module is used for starting the induced draft fan, inputting high-temperature and high-pressure steam produced by the coal-fired boiler into the steam turbine, detecting the working state of the steam turbine, and controlling the engagement of the clutch according to the working state detection data of the steam turbine to drive the generator to work.
The system comprises a coal-fired power generation module, a steam turbine compressed air energy storage module, a back pressure steam turbine, a multistage compressor, a steam turbine compressed air energy storage module and a steam turbine, wherein the steam turbine compressed air energy storage module controls a pipeline led out from a reheating steam pipeline of a boiler in the coal-fired power generation module, the reheating steam is input into the back pressure steam turbine, and the multistage compressor is driven by the back pressure steam turbine to compress air;
in addition, the compressed air energy storage module of the steam turbine at least comprises 2-4 sections of compressors, an interstage cooler at the outlet of each section, a cooling circulating water delivery pump and other equipment, air is compressed into an air storage tank through the compressors during energy storage, the compressors are divided into 2-4 sections for compression, the interstage is provided with the cooler for taking away compression heat, the temperature of compressed air behind the cooler is reduced, so that the consumption of shaft work of the steam turbine in the lower-stage compression process is reduced, the flow of compressed air in the energy storage compression process is 5-20 km 3/h, the compression time lasts for 6-8 hours, the interstage cooling is carried out by circulating cooling water, and the cooling water is heated and then enters a heat power pipe network of a power plant for utilization. The pressure of compressed air at the outlet of the tail-end compressor is 6-14MPa, the temperature is not higher than 50 ℃, and the compressed air enters the air storage module for storage.
The reheating type air turbine power generation module is used for guiding steam or flue gas generated by a boiler in the coal-fired power generation unit module to the gas storage module, heating high-pressure compressed air in the gas storage module, and conveying the heated high-pressure compressed air to the reheating type air turbine generator for expansion work;
in addition, it should be noted that the reheating type air turbine power generation module at least comprises a high pressure air turbine (high pressure cylinder of air turbine), a low pressure air turbine (low pressure cylinder of air turbine), an air turbine generator, an air-gas heat exchanger, etc., wherein the high pressure air turbine and the low pressure air turbine can be arranged coaxially or in a split-shaft manner, the air flow from the outlet of the air storage module to the air turbine is 200-, then the mixture enters an air turbine low-pressure cylinder to continue to expand and do work, the pressure is reduced to be slightly higher than the atmospheric pressure, and the temperature is reduced to be below 100 ℃ and then the mixture is discharged into the atmosphere.
The circulating cooling water module is used for cooling compression heat generated by the multistage compressor in the air compression process, controlling cooling water to enter the heat exchanger, and inputting the heated cooling water into a power plant heating power network for utilization.
The gas-gas heat exchanger module is used for conveying steam or flue gas in the boiler to the gas storage module and heating compressed air discharged by the gas storage module; the air storage module is used for storing compressed air discharged by the compressed air energy storage module of the steam turbine and controlling the compressed air in the air storage module to discharge and absorb heat of steam or flue gas guided by the reheating type air turbine power generation module.
The central control module is used for controlling each module of the whole system; the valve control module is used for controlling a back pressure type steam turbine steam inlet control valve and a heating steam inlet valve, and the back pressure type steam turbine steam inlet control valve and the heating steam inlet valve carry out feedback control on the steam turbine compressed air energy storage module and the reheating type air turbine power generation module.
The control method comprises the following steps:
at night or in a power grid valley period, the central control module controls the valve control module to close the heating steam inlet valve, the back pressure type steam turbine steam inlet control valve is opened, and the central control module controls the compressed air energy storage module of the steam turbine to start working;
the steam turbine compressed air energy storage module leads the reheated steam of the boiler to the back pressure steam turbine so that the back pressure steam turbine expands to work;
the back pressure steam turbine doing work through expansion drags the multistage compressor to compress air, and finally the compressed air is guided to the air storage module to be stored;
in the daytime or in the peak of the power grid, the central control module controls the valve control module to open the heating steam inlet valve, the back pressure type steam turbine steam inlet control valve is closed, and the central control module controls the reheating type air turbine power generation module to start working;
the reheating type air turbine power generation module guides the reheating steam to the heat exchanger, so that the reheating steam heats the high-pressure compressed air stored in the air storage module, the high-pressure compressed air is changed into high-temperature and high-pressure air with expansion work capability, and the air is guided to the reheating type air turbine power generation module to be expanded and work.
The invention mainly enhances the steam production capacity of the boiler of the coal-fired unit at night, thereby improving the operation load of the boiler, improving the operation load of the boiler on the premise of not changing the operation load of the original unit, and avoiding various factors for limiting the deep peak shaving capacity of the boiler;
the improvement of the operation load capacity of the boiler can be obtained by the following calculation formula:
in the formula: Δ W-load rate of boiler increase during deep peak shaving,%; gfw-main water supply flow of boiler, t/h; GHPex is the flow rate of reheat steam of a boiler, t/h; ims-enthalpy of main steam of the boiler, kJ/kg; ifw-enthalpy of boiler feed water, kJ/kg; ihrh-enthalpy of reheating steam of the boiler, kJ/kg; IHPex-enthalpy of high-pressure cylinder discharge, kJ/kg; Δ GHPexThe steam flow is extracted from the reheating steam pipeline and enters the back pressure type steam turbine, and t/h;
in the above formula except for Δ GHPexBesides, the measured parameters are measured parameters, delta G, when the unit operatesHPexCan be determined by the following formula:
in the formula: wi cShaft power of the compressor, KW; etaj-mechanical efficiency of back pressure turbine,%; i isbyp-back pressure turbine exhaust enthalpy, kJ/kg;
in the above formula Wi cCalculated from the following formula:
in the formula: m isair-the air flow into the compressor; k is adiabatic index, and 1.4 is taken; rg is gas constant, and 287J/(kg.K) is taken;
-compressor outlet air pressure, Pa;
-compressionMachine inlet air pressure, Pa; etac-adiabatic efficiency of the compressor,%.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention should be covered by the scope of the present invention.
Claims (8)
1. An energy storage power generation system for enhancing the deep peak regulation capability of a coal-fired unit comprises an energy storage power generation system and a control method for controlling the energy storage power generation system, and is characterized in that the energy storage power generation system comprises a power generation unit, a peak regulation unit and a control unit;
the energy storage power generation system comprises a coal-fired power generation module, a steam turbine compressed air energy storage module, a circulating cooling water module, a reheating type air turbine power generation module, a gas-gas heat exchanger module, a gas storage module, a valve control module, a central control module, a back pressure type steam turbine steam inlet control valve and a heating steam inlet valve;
the turbine compressed air energy storage module and the reheating type air turbine power generation module work in a time-sharing mode.
2. The energy storage and power generation system for enhancing the deep peak shaving capacity of the coal-fired unit according to claim 1, wherein the coal-fired power generation module is used for inputting high-temperature and high-pressure steam produced by a coal-fired boiler into the steam turbine, detecting the working state of the steam turbine, and controlling the engagement of the clutch according to the working state detection data of the steam turbine to drive the generator to work.
3. The energy storage and power generation system for enhancing the deep peak shaving capacity of the coal-fired unit as claimed in claim 1, wherein the turbine compressed air energy storage module controls a pipeline leading out from a reheat steam pipeline of a boiler in the coal-fired power generation module, inputs the reheat steam into a back pressure steam turbine, and drives a multi-stage compressor to compress air through the back pressure steam turbine.
4. The energy storage and power generation system for enhancing the deep peak shaving capacity of the coal-fired unit as claimed in claim 1, wherein the reheating type air turbine power generation module is used for guiding steam or flue gas generated by a boiler in the coal-fired power generation module to the gas storage module, heating high-pressure compressed air in the gas storage module, and conveying the heated high-pressure compressed air to the reheating type air turbine generator for expansion and work.
5. The energy storage and power generation system for enhancing the deep peak shaving capacity of the coal-fired unit as claimed in claim 1, wherein the circulating cooling water module is used for cooling the compression heat generated by the multistage compressor in the air compression process, controlling the cooling water to enter the heat exchanger, and inputting the heated cooling water into a thermal power network of a power plant for utilization.
6. The energy storage and power generation system for enhancing the deep peak shaving capacity of the coal-fired unit as claimed in claim 1, wherein the gas-gas heat exchanger module is used for conveying steam or flue gas in a boiler to the gas storage module to heat compressed air exhausted from the gas storage module; the air storage module is used for storing compressed air exhausted by the turbine compressed air energy storage module and controlling the compressed air in the air storage module to exhaust and absorb heat of steam or smoke guided by the reheating type air turbine power generation module.
7. The energy storage and power generation system for enhancing the deep peak shaving capacity of the coal-fired unit as claimed in claim 1, wherein the central control module is used for controlling each module of the whole system; the valve control module is used for controlling the back pressure type steam turbine steam inlet control valve and the heating steam inlet valve, and the back pressure type steam turbine steam inlet control valve and the heating steam inlet valve perform feedback control on the steam turbine compressed air energy storage module and the reheating type air turbine power generation module.
8. The energy storage and power generation system for enhancing the deep peak shaving capacity of the coal-fired unit according to claim 1, wherein the control method comprises the following steps:
at night or in a power grid valley period, the central control module controls the valve control module to close the heating steam inlet valve, the back pressure type steam turbine steam inlet control valve is opened, and the central control module controls the compressed air energy storage module of the steam turbine to start working;
the steam turbine compressed air energy storage module leads the reheated steam of the boiler into the back pressure steam turbine, so that the back pressure steam turbine expands to do work;
the back pressure steam turbine doing work through expansion drags the multistage compressor to compress air, and finally the compressed air is guided to the air storage module to be stored;
in the daytime or in the peak of the power grid, the central control module controls the valve control module to enable the heating steam inlet valve to be opened, the back pressure type steam turbine steam inlet control valve is closed, and the central control module controls the reheating type air turbine power generation module to start working;
the reheating type air turbine power generation module guides the reheating steam to the heat exchanger, so that the reheating steam heats the high-pressure compressed air stored in the air storage module, the high-pressure compressed air is changed into high-temperature and high-pressure air with expansion work capability, and the air is guided to the reheating type air turbine power generator to be expanded and work.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111121874.9A CN114215619A (en) | 2021-09-24 | 2021-09-24 | Energy storage power generation system for enhancing deep peak regulation capability of coal-fired unit |
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| DE102015109898A1 (en) * | 2015-02-20 | 2016-08-25 | Mitsubishi Hitachi Power Systems Europe Gmbh | Steam power plant and method for its operation |
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