CN114458407A - System and method for coupling natural gas energy storage with gas turbine power generation - Google Patents
System and method for coupling natural gas energy storage with gas turbine power generation Download PDFInfo
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- CN114458407A CN114458407A CN202210242646.5A CN202210242646A CN114458407A CN 114458407 A CN114458407 A CN 114458407A CN 202210242646 A CN202210242646 A CN 202210242646A CN 114458407 A CN114458407 A CN 114458407A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 358
- 239000003345 natural gas Substances 0.000 title claims abstract description 179
- 239000007789 gas Substances 0.000 title claims abstract description 91
- 238000004146 energy storage Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000008878 coupling Effects 0.000 title claims abstract description 16
- 238000010168 coupling process Methods 0.000 title claims abstract description 16
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 16
- 238000010248 power generation Methods 0.000 title claims description 17
- 150000003839 salts Chemical class 0.000 claims abstract description 33
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003546 flue gas Substances 0.000 claims abstract description 19
- 230000001105 regulatory effect Effects 0.000 claims description 20
- 238000002485 combustion reaction Methods 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 7
- 239000002699 waste material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 239000002918 waste heat 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
- 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
- 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
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/04—Using steam or condensate extracted or exhausted from steam engine plant for specific purposes other than heating
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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
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
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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
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
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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
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
- F02C3/22—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being gaseous at standard temperature and pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
- F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
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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
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/18—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use for specific elastic fluids
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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
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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- Engineering & Computer Science (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 invention discloses a system and a method for generating power by coupling natural gas energy storage with a gas turbine.A natural gas pipeline network outlet is communicated with the shell side of a turbine heat exchanger through a natural gas compressor, the pipe side of a compressor heat exchanger, a compressed natural gas inlet valve, a high-pressure natural gas outlet valve, the pipe side of the turbine heat exchanger, a natural gas turbine, a gas turbine and a flue gas heat exchanger in sequence; the salt cavern/mine is communicated with a pipeline between a compressed natural gas inlet valve and a high-pressure natural gas outlet valve through a salt cavern/mine inlet and outlet gas main valve, a gas turbine is connected with a gas turbine generator, and a natural gas turbine is connected with a turbine generator.
Description
Technical Field
The invention belongs to the field of new energy storage, and relates to a system and a method for generating power by coupling natural gas energy storage with a gas turbine.
Background
In recent years, the research on air energy storage technology is more intensive, and compressed air energy storage modes are more, and the main principle is that when the load of a power grid is lower, the air is compressed into compressed air by utilizing the surplus power of the power grid and stored in a salt cavern, a mine pit or a large storage tank, the compressed air is used for driving a generator to generate electricity through an air turbine during the standby power peak period, and the current efficiency of compressed air energy storage is about 50% -70%. When the load demand of a power grid is low, the natural gas in a natural gas pipe network is compressed into high-pressure natural gas by a natural gas compressor and stored in a salt pit, a mine pit or a large storage tank. When the load demand of a power grid is high, high-pressure natural gas stored in a salt cavern, a mine pit or a large storage tank pushes a generator to generate electricity through a natural gas turbine, meanwhile, low-pressure natural gas which does work and is about 3MPa enters a gas turbine to be combusted and generated, the opening degree of a gas turbine inlet regulating valve controls the power generation power of the gas turbine and the power of the gas turbine, high-temperature flue gas generated by the gas turbine can pass through a waste heat boiler or other energy storage processes such as heat conduction oil and the like, the heat of the flue gas can be reused, and the efficiency is further improved. The process firstly realizes a novel natural gas energy storage power generation technology and can realize peak shaving of a power grid; secondly, the comprehensive utilization of the waste mine is realized, and a lot of treatment cost is saved; at present, a liquefaction process is generally adopted for mass storage of natural gas, and the process has high cost, high energy consumption and poor economical efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for generating power by coupling natural gas energy storage with a combustion engine.
In order to achieve the purpose, the system for generating electricity by coupling natural gas energy storage with the gas turbine comprises a natural gas pipe network, a natural gas compressor, a compressor heat exchanger, a compressed natural gas inlet valve, a salt cavern/mine inlet and outlet main valve, a salt cavern/mine, a high-pressure natural gas outlet valve, a turbine heat exchanger, a natural gas turbine, a turbine generator, a gas turbine generator and a flue gas heat exchanger;
the outlet of the natural gas pipe network is communicated with the shell side of the turbine heat exchanger through a natural gas compressor, the pipe side of a compressor heat exchanger, a compressed natural gas inlet valve, a high-pressure natural gas outlet valve, the pipe side of the turbine heat exchanger, a natural gas turbine, a gas turbine and a flue gas heat exchanger in sequence;
the salt cavern/mine is communicated with a pipeline between the compressed natural gas inlet valve and the high-pressure natural gas outlet valve through a salt cavern/mine inlet and outlet gas main valve, the gas turbine is connected with the gas turbine generator, and the natural gas turbine is connected with the turbine generator.
The pipe side of the turbine heat exchanger is communicated with the natural gas turbine through a natural gas turbine inlet regulating valve.
The natural gas turbine inlet regulating valve is locked with the gas turbine generator and the turbine generator.
And a pipeline between the natural gas turbine inlet regulating valve and the natural gas turbine is provided with a turbine inlet gas flow sensor, a turbine inlet gas temperature sensor and a turbine inlet gas pressure sensor.
And a turbine outlet gas temperature sensor and a turbine outlet gas pressure sensor are arranged on a pipeline between the natural gas turbine and the gas turbine.
The method for generating power by coupling natural gas energy storage with a combustion engine comprises the following steps:
when the load of the power grid is low, the natural gas in the natural gas pipe network is compressed to high pressure by the surplus power through the natural gas compressor, the high-pressure natural gas output by the natural gas compressor is subjected to heat exchange and cooling through the compressor heat exchanger, and then enters the salt cavern/mine through the compressed natural gas inlet valve and the salt cavern/mine inlet and outlet main valve for storage;
when the load demand of the power grid is high, a salt cavern/mine inlet and outlet main valve and a high-pressure natural gas outlet valve are opened, high-pressure natural gas stored in the salt cavern/mine is heated and heated in a turbine heat exchanger to form high-temperature high-pressure natural gas, then enters a natural gas turbine through a natural gas turbine inlet regulating valve to do work so as to drive a turbine generator to generate electricity, the natural gas discharged by the natural gas turbine enters a gas turbine to be combusted so as to drive a gas turbine generator to generate electricity, the flue gas output by the gas turbine is subjected to heat exchange and temperature reduction through a flue gas heat exchanger, and the cooled flue gas is subjected to heat exchange and temperature reduction again through the turbine heat exchanger and then enters a subsequent processing system.
The flow control of the natural gas is adjusted through a natural gas turbine inlet adjusting valve so as to control the power of the gas turbine generator.
The power of the turbine generator is controlled by the opening degree of the natural gas turbine inlet regulating valve.
The power of a turbine generator and a gas turbine generator is controlled through a natural gas turbine inlet regulating valve, and the method specifically comprises the following steps:
W＝Wtransparent film+WBurning device (1)
WBurning device＝Q13×Cp×ηBurning device÷3600 (3)
Wherein Q is13Is the inlet gas flow of the natural gas turbine, Cp is the constant pressure specific heat capacity of the natural gas, k is the adiabatic index, P17Is naturalOutlet pressure, P, of gas turbine15Is the inlet pressure, η, of a natural gas turbineBurning deviceFor the total efficiency, η, of the power generation of the gas turbine generatorTransparent filmThe total power generation efficiency of the natural gas turbine;
calculating the inlet gas flow Q of the natural gas turbine by using the formulas (1) to (3) according to the load W of the total demand of the power grid13And automatically adjusting the opening of the inlet adjusting valve of the natural gas turbine to ensure that the total power of the gas turbine generator and the turbine generator is matched with the load of the total demand of the power grid.
The invention has the following beneficial effects:
when the system and the method for the natural gas energy storage coupling gas turbine power generation are operated specifically, when the load of a power grid is low, the natural gas compressor is driven by surplus power to extract and compress natural gas in a natural gas pipe network, the natural gas is stored in a salt cavern/mine, when the load demand of the power grid is high, high-pressure natural gas stored in the salt cavern/mine is heated, and then a turbine generator and a gas turbine generator are used for generating power, so that the problem of insufficient electric quantity is solved, the organic combination of novel natural gas energy storage and power generation is realized, meanwhile, the comprehensive utilization of a waste mine is realized, the post-treatment cost of the waste mine is saved, the compressed natural gas has high pressure due to the large volume of the waste mine, and the mass storage of the natural gas is realized at the lowest cost. The natural gas is subjected to peak shaving power generation through the turbine and the gas turbine, the starting time is short, the power of the gas turbine is high, the system has a strong peak shaving effect on a power grid, and the economic benefit of the system is greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
The system comprises a natural gas compressor 1, a compressor heat exchanger 2, a compressed natural gas inlet valve 3, a salt cavern/mine inlet and outlet main valve 4, a salt cavern/mine 5, a high-pressure natural gas outlet valve 6, a turbine heat exchanger 7, a natural gas turbine inlet regulating valve 8, a natural gas turbine 9, a turbine generator 10, a gas turbine 11, a gas turbine generator 12, a flue gas heat exchanger 13, a turbine inlet gas flow sensor 14, a turbine inlet gas temperature sensor 15, a turbine inlet gas pressure sensor 16, a turbine outlet gas temperature sensor 17 and a turbine outlet gas pressure sensor 18.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. 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.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the system for power generation by a natural gas energy storage coupling gas turbine comprises a natural gas compressor 1, a compressor heat exchanger 2, a compressed natural gas inlet valve 3, a salt cavern/mine inlet and outlet main valve 4, a salt cavern/mine 5, a high-pressure natural gas outlet valve 6, a turbine heat exchanger 7, a natural gas turbine inlet regulating valve 8, a natural gas turbine 9, a turbine generator 10, a gas turbine 11, a gas turbine generator 12, a flue gas heat exchanger 13, a turbine inlet gas flow sensor 14, a turbine inlet gas temperature sensor 15, a turbine inlet gas pressure sensor 16, a turbine outlet gas temperature sensor 17 and a turbine outlet gas pressure sensor 18;
an outlet of the natural gas pipe network is communicated with the shell side of the turbine heat exchanger 7 through a natural gas compressor 1, the pipe side of a compressor heat exchanger 2, a compressed natural gas inlet valve 3, a high-pressure natural gas outlet valve 6, the pipe side of the turbine heat exchanger 7, a natural gas turbine inlet adjusting valve 8, a natural gas turbine 9, a gas turbine 11 and a flue gas heat exchanger 13 in sequence;
the salt cavern/mine 5 is communicated with a pipeline between a compressed natural gas inlet valve 3 and a high-pressure natural gas outlet valve 6 through a salt cavern/mine inlet and outlet main valve 4, a gas turbine 11 is connected with a gas turbine generator 12, a natural gas turbine 9 is connected with a turbine generator 10, and a pipeline between a natural gas turbine inlet regulating valve 8 and the natural gas turbine 9 is provided with a turbine inlet gas flow sensor 14, a turbine inlet gas temperature sensor 15 and a turbine inlet gas pressure sensor 16; a turbine outlet gas temperature sensor 17 and a turbine outlet gas pressure sensor 18 are provided in a pipeline between the natural gas turbine 9 and the gas turbine 11.
The natural gas turbine inlet regulating valve 8 is locked with a gas turbine generator 12 and a turbine generator 10.
The working process of the invention is as follows:
when the load of the power grid is low, the natural gas in the natural gas pipe network is compressed to high pressure (more than 8 MPa) by the surplus power through the natural gas compressor 1, and meanwhile, heat generated in the working process of the natural gas compressor 1 is carried out of the system through the heat conduction oil or other heat storage media by the compressor heat exchanger 2, so that the system can be used for industrial heat supply. High-pressure natural gas output by a natural gas compressor 1 is subjected to heat exchange and cooling through a compressor heat exchanger 2, and then enters a salt cavern/mine 5 through a compressed natural gas inlet valve 3 and a salt cavern/mine inlet and outlet main valve 4 for storage;
when the load demand of the power grid is high, a salt cavern/mine inlet and outlet main valve 4 and a high-pressure natural gas outlet valve 6 are opened, high-pressure natural gas stored in the salt cavern/mine is heated and heated in a turbine heat exchanger 7 to form high-temperature high-pressure natural gas, then enters a natural gas turbine 9 through a natural gas turbine inlet regulating valve 8 to do work so as to drive a turbine generator 10 to generate electricity, the power of the turbine generator 10 is controlled through the opening degree of the natural gas turbine inlet regulating valve 8, the natural gas discharged from the natural gas turbine 9 enters a gas turbine 11 to be combusted so as to drive the gas turbine generator 12 to generate electricity, the flow control of the natural gas is regulated through the natural gas turbine inlet regulating valve 8 so as to control the power of the gas turbine generator 12, the flue gas output by the gas turbine 11 is subjected to heat exchange and cooling through a flue gas heat exchanger 13, and the heat is transferred to heat conduction oil or other energy storage materials, the cooled flue gas enters a subsequent treatment system after heat exchange and cooling again through a turbine heat exchanger 7, and the temperature of the natural gas is increased by 50-100 ℃.
The power of a turbine generator 10 and a gas turbine generator 12 is controlled through a natural gas turbine inlet regulating valve 8, specifically:
W＝Wtransparent film+WBurning device (1)
WBurning device＝Q13×Cp×ηBurning device÷3600 (3)
Wherein Q is13Is the inlet gas flow of the natural gas turbine 9, Cp is the constant pressure specific heat capacity of the natural gas, k is the adiabatic index, P17Is the outlet pressure, P, of the natural gas turbine 915Is the inlet pressure, η, of the natural gas turbine 9Burning deviceThe total power generation efficiency, eta, of the combustion engine generator 12Transparent filmThe total efficiency of the power generation of the natural gas turbine 9.
Calculating the inlet gas flow Q of the natural gas turbine 9 according to the load W of the total demand of the power grid using the equations (1) to (3)13And automatically adjusting the opening of the natural gas turbine inlet adjusting valve 8 to enable the total power of the gas turbine generator 12 and the turbine generator 10 to be matched with the load of the total demand of the power grid.
Claims (9)
1. A natural gas energy storage coupling gas turbine power generation system is characterized by comprising a natural gas pipe network, a natural gas compressor (1), a compressor heat exchanger (2), a compressed natural gas inlet valve (3), a salt cavern/mine inlet and outlet main valve (4), a salt cavern/mine (5), a high-pressure natural gas outlet valve (6), a turbine heat exchanger (7), a natural gas turbine (9), a turbine generator (10), a gas turbine (11), a gas turbine generator (12) and a flue gas heat exchanger (13);
an outlet of the natural gas pipe network is communicated with the shell side of the turbine heat exchanger (7) through a natural gas compressor (1), the pipe side of a compressor heat exchanger (2), a compressed natural gas inlet valve (3), a high-pressure natural gas outlet valve (6), the pipe side of the turbine heat exchanger (7), a natural gas turbine (9), a gas turbine (11) and a flue gas heat exchanger (13) in sequence;
the salt cavern/mine (5) is communicated with a pipeline between the compressed natural gas inlet valve (3) and the high-pressure natural gas outlet valve (6) through a salt cavern/mine inlet and outlet main valve (4), a gas turbine (11) is connected with a gas turbine generator (12), and a natural gas turbine (9) is connected with a turbine generator (10).
2. The system for power generation by a natural gas energy storage coupled combustion engine as claimed in claim 1, wherein the pipe side of the turbine heat exchanger (7) is communicated with the natural gas turbine (9) through a natural gas turbine inlet regulating valve (8).
3. The system for power generation by the natural gas energy storage coupled combustion engine as claimed in claim 2, wherein the natural gas turbine inlet regulating valve (8) is locked with the combustion engine generator (12) and the turbine generator (10).
4. The system for generating power by the natural gas energy storage coupling combustion engine as claimed in claim 2, wherein a turbine inlet gas flow sensor (14), a turbine inlet gas temperature sensor (15) and a turbine inlet gas pressure sensor (16) are arranged on a pipeline between the natural gas turbine inlet regulating valve (8) and the natural gas turbine (9).
5. The system for generating power by the natural gas energy storage coupling combustion engine as claimed in claim 1, wherein a turbine outlet gas temperature sensor (17) and a turbine outlet gas pressure sensor (18) are arranged on a pipeline between the natural gas turbine (9) and the gas turbine (11).
6. The method for generating power by coupling natural gas energy storage with a combustion engine is characterized in that the system for generating power by coupling natural gas energy storage with the combustion engine based on claim 2 comprises the following steps:
when the load of the power grid is low, the natural gas in the natural gas pipeline network is compressed to high pressure by the surplus power through the natural gas compressor (1), the high-pressure natural gas output by the natural gas compressor (1) is subjected to heat exchange and cooling through the compressor heat exchanger (2), and then enters the salt cavern/mine (5) through the compressed natural gas inlet valve (3) and the salt cavern/mine inlet and outlet main valve (4) for storage;
when the load demand of a power grid is high, a salt cavern/mine inlet and outlet main valve (4) and a high-pressure natural gas outlet valve (6) are opened, high-pressure natural gas stored in the salt cavern/mine is heated and heated in a turbine heat exchanger (7) to form high-temperature high-pressure natural gas, then enters a natural gas turbine (9) through a natural gas turbine inlet adjusting valve (8) to do work to drive a turbine generator (10) to generate electricity, natural gas discharged from the natural gas turbine (9) enters a gas turbine (11) to be combusted to drive the gas turbine generator (12) to generate electricity, flue gas output from the gas turbine (11) is subjected to heat exchange and cooling through a flue gas heat exchanger (13), and the cooled flue gas is subjected to heat exchange and cooling again through the turbine heat exchanger (7) and then enters a subsequent processing system.
7. The method for generating power by coupling natural gas energy storage with combustion engine as claimed in claim 6, characterized in that the flow control of natural gas is adjusted by the natural gas turbine inlet adjusting valve (8) to control the power of the combustion engine generator (12).
8. The method for generating power by the natural gas energy storage coupled combustion engine is characterized in that the power of the turbine generator (10) is controlled by the opening degree of the natural gas turbine inlet adjusting valve (8).
9. The method for generating power by coupling natural gas energy storage with the combustion engine as claimed in claim 8, wherein the power of the turbine generator (10) and the combustion engine generator (12) is controlled by the natural gas turbine inlet regulating valve (8), specifically:
W＝Wtransparent film+WBurning device (1)
WBurning device＝Q13×Cp×ηBurning device÷3600 (3)
Wherein Q is13Is the inlet gas flow of the natural gas turbine (9), Cp is the constant pressure specific heat capacity of the natural gas, k is the adiabatic index, P17Is the outlet pressure, P, of the natural gas turbine (9)15Is the inlet pressure, eta, of the natural gas turbine (9)Burning deviceFor the total efficiency, eta, of the power generation of the combustion engine generator (12)Transparent filmThe total power generation efficiency of the natural gas turbine (9);
calculating the inlet gas flow Q of the natural gas turbine (9) according to the load W of the total demand of the power grid by using the formulas (1) to (3)13And automatically adjusting the opening degree of the natural gas turbine inlet adjusting valve (8) to enable the total power of the gas turbine generator (12) and the turbine generator (10) to be matched with the load of the total demand of the power grid.
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| CN202210242646.5A CN114458407A (en) | 2022-03-11 | 2022-03-11 | System and method for coupling natural gas energy storage with gas turbine power generation |
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| CN202210242646.5A CN114458407A (en) | 2022-03-11 | 2022-03-11 | System and method for coupling natural gas energy storage with gas turbine power generation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116357551A (en) * | 2023-04-11 | 2023-06-30 | 西安热工研究院有限公司 | Energy-saving compressed air energy storage system and operation control method |
Citations (7)
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