CN111305920A - Steam-driven air energy storage peak regulation system and method - Google Patents
Steam-driven air energy storage peak regulation system and method Download PDFInfo
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- CN111305920A CN111305920A CN202010203398.4A CN202010203398A CN111305920A CN 111305920 A CN111305920 A CN 111305920A CN 202010203398 A CN202010203398 A CN 202010203398A CN 111305920 A CN111305920 A CN 111305920A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000005338 heat storage Methods 0.000 claims abstract description 57
- 239000007788 liquid Substances 0.000 claims abstract description 46
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 238000010795 Steam Flooding Methods 0.000 claims abstract description 9
- 238000007906 compression Methods 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 238000011084 recovery Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 6
- 238000010248 power generation Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 11
- 230000005611 electricity Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
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- 238000010438 heat treatment Methods 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
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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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Abstract
The invention discloses a steam-driven air energy storage peak shaving system and a method, wherein the system consists of a first turbine set, a compressor, a cooler, a gas-liquid conversion device, a liquid air storage tank, a heater, an expander, a heat storage system cold tank, a heat storage system hot tank, a second turbine set, a condenser and a control valve; the operation method of the system comprises an energy storage mode and an energy release mode; the steam turbine directly driven by steam drives the compressor to compress air, the intermediate link from steam heat energy to electric energy to mechanical energy is eliminated, the compressor is directly driven by the high-speed steam turbine, the cost of the motor and the speed increaser is saved, the energy loss in the transmission process is reduced, the energy loss of the energy storage peak regulation system is greatly reduced on the whole, and the economical efficiency is improved; the purpose of additionally arranging the heat storage system is to recover heat generated in the compression process and improve the efficiency of the energy storage system.
Description
Technical Field
The invention belongs to the technical field of energy storage peak shaving, and particularly relates to a steam-drive air energy storage peak shaving system and a method, which are suitable for various thermal power plants taking a coal-fired unit as a typical power plant and can improve the flexibility and economic benefits of the coal-fired unit.
Background
At present, renewable energy sources such as wind energy, solar energy and the like in China are rapidly developed year by year, in addition, the electricity consumption of the whole society is increased year by year, the electricity peak-valley difference of a power grid is increased day by day, and the requirements of the power grid on the peak regulation times and the depth of a coal-fired unit are greatly improved.
The technology for improving the peak regulation capacity of the coal-fired unit mainly comprises an electric boiler heat storage technology, a water tank heat storage technology, a steam turbine steam flow reconstruction technology, an electrochemical battery energy storage technology and the like, wherein electric energy is converted into heat energy for heating through the electric boiler heat storage technology, the peak regulation capacity is high, but the energy quality is greatly reduced, and the electric boiler heat storage technology is only suitable for a cogeneration unit, the water tank heat storage technology and the steam turbine steam flow reconstruction technology have the advantages of good heat economy, relatively low investment, limited peak regulation capacity and suitability for the cogeneration unit, the electrochemical battery energy storage technology has the advantages of quick response, small volume and short construction period, but short service life, high average cost and high safety risk, and whether the electric boiler is suitable for constructing large-scale energy storage and still needs engineering demonstration verification.
Disclosure of Invention
In order to overcome the defects of the existing peak regulation technology of the coal-fired unit, the invention provides a steam-driven air energy-storage peak regulation system and a method, in the energy storage process, a steam turbine directly driven by steam drives a compressor to compress air, so that the intermediate link from steam heat energy to electric energy to mechanical energy is avoided, the compressor is directly driven by a high-speed steam turbine, the cost of a motor and a speed increaser is saved, the energy loss in the transmission process is reduced, the energy loss of the energy-storage peak regulation system is greatly reduced on the whole, and the economical efficiency is improved.
In order to achieve the purpose, the invention adopts the following technical scheme.
A steam-driven air energy storage peak shaving system is composed of a first turbine set 1, a compressor 2, a cooler 3, a gas-liquid conversion device 4, a liquid air storage tank 5, a heater 6, an expander 7, a heat storage system cold tank 8, a first valve 9, a heat storage system hot tank 10, a second valve 11, a second turbine set 12, a condenser 13, a third valve 14 and a fourth valve 15;
the first turbine unit 1 is connected with the compressor 2 through a connecting shaft, the compressor 2 is directly driven to rotate, and an outlet of the compressor 2 is sequentially communicated with a high-temperature side inlet of the cooler 3, a high-temperature side outlet of the cooler 3, a cooling liquefaction side inlet of the gas-liquid conversion device 4, a cooling liquefaction side outlet of the gas-liquid conversion device 4 and an inlet of the liquid air storage tank 5; an outlet of the liquid air storage tank 5 is sequentially communicated with a cold energy recovery side inlet of the gas-liquid conversion device 4, a cold energy recovery side outlet of the gas-liquid conversion device 4, a low-temperature side inlet of the heater 6, a low-temperature side outlet of the heater 6 and the expander 7; the second turbine set 12 is communicated with the inlet of the first turbine set 1 through a third valve 14, and the outlet of the first turbine set 1 is communicated with the inlet of a condenser 13 through a fourth valve 15; the outlet of the second turbine set 12 is also communicated with the inlet of the condenser 13; an outlet of the heat storage system cold tank 8 is communicated with a low-temperature side inlet of the cooler 3 through a first valve 9, a low-temperature side outlet of the cooler 3 is communicated with an inlet of the heat storage system hot tank 10, an outlet of the heat storage system hot tank 10 is communicated with a high-temperature side inlet of the heater 6 through a second valve 11, and a high-temperature side outlet of the heater 6 is communicated with an inlet of the heat storage system cold tank 8; the system directly drives the compressor to compress air by the steam turbine driven by steam, the intermediate link from steam heat energy to electric energy and then mechanical energy is eliminated, the compressor is directly driven by the high-speed steam turbine, the cost of the motor and the speed increaser is saved, the energy loss in the transmission process is reduced, the energy loss of the energy storage peak regulation system is greatly reduced on the whole, and the economical efficiency is improved.
The compressor 2 and the cooler 3 are both in one stage or multiple stages, the number of the compressor 2 and the number of the cooler 3 are in one-to-one correspondence, and the corresponding coolers are connected in series behind each stage of the compressor.
The heaters 6 and the expanders 7 are all in one stage or multiple stages, the number of the heaters 6 corresponds to that of the expanders 7 one by one, and the corresponding expanders are connected behind each stage of the heaters in series.
The second turbine set 12 includes a high pressure cylinder, an intermediate pressure cylinder, and a low pressure cylinder, which are connected in sequence.
The third valve 14 is communicated with an outlet of an intermediate pressure cylinder and an inlet of a low pressure cylinder in the second steam turbine set 12, or other steam extraction positions are optimally screened according to the condition of the generator set.
The heat storage system cold tank 8 and the heat storage system hot tank 10 are used for recovering compression heat generated in the compression process, and the efficiency of the energy storage system is improved.
The system is suitable for a cogeneration unit and a straight condensing unit, can greatly improve the peak regulation capacity of a coal-fired unit, and reduces energy conversion links.
The operation method of the steam-driven air energy storage and peak regulation system comprises an energy storage mode and an energy release mode, and specifically comprises the following steps:
an energy storage mode: the energy storage mode is started when the power consumption of the power grid is low and the coal-fired unit is required to reduce the power generation load, the first valve 9, the third valve 14 and the fourth valve 15 are opened, and the second valve 11 is closed; steam enters the first steam turbine unit 1 from the second steam turbine unit 12 through the third valve 14 to push the first steam turbine unit 1 to rotate at a high speed, dead steam at the outlet of the first steam turbine unit 1 enters the condenser 13 through the fourth valve 15 to be condensed into water, and then continues to enter a thermal system of the coal-fired unit; the first turbine unit 1 drives the compressor 2 to compress air through the connecting shaft, the obtained high-temperature and high-pressure air enters the cooler 3, the low-temperature heat storage medium enters the cooler 3 from the heat storage system cold tank 8 through the first valve 9 to cool the high-temperature and high-pressure air, the obtained high-temperature heat storage medium is stored in the heat storage system hot tank 10, the normal-temperature and high-pressure air at the high-temperature side outlet of the cooler 3 is cooled and liquefied through the gas-liquid conversion device 4, and the low-temperature liquid air enters the liquid air storage tank 5 to be stored;
energy release mode: starting an energy release mode when the power consumption peak of a power grid and the power generation load of a coal-fired unit need to be lifted, closing a first valve 9, a third valve 14 and a fourth valve 15, and opening a second valve 11; the low-temperature liquid air flows out of the liquid air storage tank 5, normal-temperature high-pressure air generated after cold energy recovery is carried out by the gas-liquid conversion device 4 enters the heater 6, high-temperature heat storage medium enters the heater 6 from the heat storage system hot tank 10 through the second valve 11 to heat the normal-temperature high-pressure air, the obtained low-temperature heat storage medium is stored in the heat storage system cold tank 8, the high-temperature high-pressure air at the low-temperature side outlet of the heater 6 enters the expansion machine 7 to be expanded to work and output electric energy, and the normal-pressure normal-temperature air at the outlet of the expansion machine 7.
Compared with the prior art, the invention has the following advantages:
the steam-driven air energy storage peak regulation system and the method are suitable for a cogeneration unit and a straight condensing unit, the steam turbine directly driven by steam in the energy storage process drives the compressor to compress air, the intermediate link from steam heat energy to electric energy to mechanical energy is cancelled, and the compressor is directly driven by the high-speed steam turbine, so that the cost of a motor and a speed increaser is saved, the energy loss in the transmission process is reduced, the energy loss of the energy storage peak regulation system is greatly reduced on the whole, and the economy is improved; the purpose of additionally arranging the heat storage system is to recover heat generated in the compression process and improve the efficiency of the energy storage system.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure:
1-first turbine set 2-compressor 3-cooler 4-gas-liquid conversion device
5-liquid air storage tank 6-heater 7-expander 8-heat storage system cold tank
9-first valve 10-heat storage system hot tank 11-second valve 12-first turbine set
13-condenser 14-third valve 15-fourth valve
Detailed Description
The invention will be described in further detail with reference to the following drawings and specific embodiments, which are described herein for purposes of illustration only and are not intended to be limiting.
As shown in fig. 1, the peak shaving system for energy storage of air driven by steam of the present invention comprises a first turbine unit 1, a compressor 2, a cooler 3, a gas-liquid conversion device 4, a liquid air storage tank 5, a heater 6, an expander 7, a heat storage system cold tank 8, a first valve 9, a heat storage system hot tank 10, a second valve 11, a second turbine unit 12, a condenser 13, a third valve 14 and a fourth valve 15.
The first turbine unit 1 is connected with the compressor 2 through a connecting shaft, the compressor 2 is directly driven to rotate, and the outlet of the compressor 2 is sequentially communicated with the high-temperature side inlet of the cooler 3, the high-temperature side outlet of the cooler 3, the cooling liquefaction side inlet of the gas-liquid conversion device 4, the cooling liquefaction side outlet of the gas-liquid conversion device 4 and the inlet of the liquid air storage tank 5; an outlet of the liquid air storage tank 5 is sequentially communicated with a cold energy recovery side inlet of the gas-liquid conversion device 4, a cold energy recovery side outlet of the gas-liquid conversion device 4, a low-temperature side inlet of the heater 6, a low-temperature side outlet of the heater 6 and the expander 7; the second turbine set 12 is communicated with the inlet of the first turbine set 1 through a third valve 14, and the outlet of the first turbine set 1 is communicated with the inlet of a condenser 13 through a fourth valve 15; an outlet of the second turbine unit 12 is communicated with an inlet of a condenser 13; an outlet of the heat storage system cold tank 8 is communicated with a low-temperature side inlet of the cooler 3 through a first valve 9, a low-temperature side outlet of the cooler 3 is communicated with an inlet of the heat storage system hot tank 10, an outlet of the heat storage system hot tank 10 is communicated with a high-temperature side inlet of the heater 6 through a second valve 11, and a high-temperature side outlet of the heater 6 is communicated with an inlet of the heat storage system cold tank 8; the system is suitable for a cogeneration unit and a straight condensing unit, can greatly improve the peak regulation capacity of a coal-fired unit, and reduces energy conversion links.
The steam-driven air energy storage and peak regulation system can operate according to the following energy storage mode and energy release mode.
An energy storage mode: the energy storage mode is started when the power consumption of the power grid is low and the coal-fired unit is required to reduce the power generation load, the first valve 9, the third valve 14 and the fourth valve 15 are opened, and the second valve 11 is closed; steam enters the first steam turbine unit 1 from the second steam turbine unit 12 through the third valve 14 to push the first steam turbine unit 1 to rotate at a high speed, dead steam at the outlet of the first steam turbine unit 1 enters the condenser 13 through the fourth valve 15 to be condensed into water, and then continues to enter a thermal system of the coal-fired unit; the first turbine unit 1 drives the compressor 2 to compress air through the connecting shaft, the obtained high-temperature high-pressure air enters the cooler 3, the low-temperature heat storage medium enters the cooler 3 from the heat storage system cold tank 8 through the first valve 9 to cool the high-temperature high-pressure air, the obtained high-temperature heat storage medium is stored in the heat storage system hot tank 10, the normal-temperature high-pressure air at the high-temperature side outlet of the cooler 3 is cooled and liquefied through the gas-liquid conversion device 4, and the low-temperature liquid air enters the liquid air storage tank 5 to be stored.
Energy release mode: starting an energy release mode when the power consumption peak of a power grid and the power generation load of a coal-fired unit need to be lifted, closing a first valve 9, a third valve 14 and a fourth valve 15, and opening a second valve 11; the low-temperature liquid air flows out of the liquid air storage tank 5, normal-temperature high-pressure air generated after cold energy recovery is carried out by the gas-liquid conversion device 4 enters the heater 6, high-temperature heat storage medium enters the heater 6 from the heat storage system hot tank 10 through the second valve 11 to heat the normal-temperature high-pressure air, the obtained low-temperature heat storage medium is stored in the heat storage system cold tank 8, the high-temperature high-pressure air at the low-temperature side outlet of the heater 6 enters the expansion machine 7 to be expanded to work and output electric energy, and the normal-pressure normal-temperature air at the outlet of the expansion machine 7.
While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the invention may be made by those skilled in the art within the spirit and scope of the invention. Any insubstantial modification of the invention using this concept is intended to be covered by the act of infringing the scope of the invention.
Claims (8)
1. The utility model provides a vapour drives air energy storage system of peaking which characterized in that: the system comprises a first turbine set (1), a compressor (2), a cooler (3), a gas-liquid conversion device (4), a liquid air storage tank (5), a heater (6), an expander (7), a heat storage system cold tank (8), a first valve (9), a heat storage system hot tank (10), a second valve (11), a second turbine set (12), a condenser (13), a third valve (14) and a fourth valve (15);
the first turbine set (1) is connected with the compressor (2) through a connecting shaft, the compressor (2) is directly driven to rotate, and an outlet of the compressor (2) is sequentially communicated with a high-temperature side inlet of the cooler (3), a high-temperature side outlet of the cooler (3), a cooling liquefaction side inlet of the gas-liquid conversion device (4), a cooling liquefaction side outlet of the gas-liquid conversion device (4) and an inlet of the liquid air storage tank (5); an outlet of the liquid air storage tank (5) is sequentially communicated with a cold energy recovery side inlet of the gas-liquid conversion device (4), a cold energy recovery side outlet of the gas-liquid conversion device (4), a low-temperature side inlet of the heater (6), a low-temperature side outlet of the heater (6) and the expander (7); the second turbine set (12) is communicated with the inlet of the first turbine set (1) through a third valve (14), the outlet of the first turbine set (1) is communicated with the inlet of the condenser (13) through a fourth valve (15), and the outlet of the second turbine set (12) is also communicated with the inlet of the condenser (13); an outlet of a cold tank (8) of the heat storage system is communicated with a low-temperature side inlet of a cooler (3) through a first valve (9), a low-temperature side outlet of the cooler (3) is communicated with an inlet of a hot tank (10) of the heat storage system, an outlet of the hot tank (10) of the heat storage system is communicated with a high-temperature side inlet of a heater (6) through a second valve (11), and a high-temperature side outlet of the heater (6) is communicated with an inlet of the cold tank (8) of the heat storage system; the system directly drives the compressor to compress air by the steam turbine driven by steam, the intermediate link from steam heat energy to electric energy and then mechanical energy is eliminated, the compressor is directly driven by the high-speed steam turbine, the cost of the motor and the speed increaser is saved, the energy loss in the transmission process is reduced, the energy loss of the energy storage peak regulation system is greatly reduced on the whole, and the economical efficiency is improved.
2. A steam drive air energy storage peak shaving system according to claim 1, characterized in that: the compressor (2) and the cooler (3) are both in one stage or multiple stages, the number of the compressor (2) and the number of the cooler (3) are in one-to-one correspondence, and the corresponding coolers are connected in series behind each stage of the compressor.
3. A steam drive air energy storage peak shaving system according to claim 1, characterized in that: the heaters (6) and the expanders (7) are all in one stage or multiple stages, the number of the heaters (6) corresponds to that of the expanders (7), and the corresponding expanders are connected behind each stage of the heaters in series.
4. A steam drive air energy storage peak shaving system according to claim 1, characterized in that: the second turbine set (12) comprises a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder which are sequentially connected.
5. A steam drive air energy storage peak shaving system according to claim 4, characterized in that: and the third valve (14) is communicated with an outlet of an intermediate pressure cylinder and an inlet of a low pressure cylinder in the second steam turbine set (12), or the steam extraction position is optimally screened according to the condition of the generator set.
6. A steam drive air energy storage peak shaving system according to claim 1, characterized in that: the heat storage system cold tank (8) and the heat storage system hot tank (10) are used for recovering compression heat generated in the compression process, and the efficiency of the energy storage system is improved.
7. A steam drive air energy storage peak shaving system according to claim 1, characterized in that: the system is suitable for a cogeneration unit and a straight condensing unit, can greatly improve the peak regulation capacity of a coal-fired unit, and reduces energy conversion links.
8. The operation method of the steam-driven air energy-storage peak-shaving system according to any one of claims 1 to 7, characterized by comprising the following steps: the energy storage device comprises an energy storage mode and an energy release mode, and specifically comprises the following steps:
an energy storage mode: the energy storage mode is started when the power consumption of the power grid is low and the coal-fired unit is required to reduce the power generation load, the first valve (9), the third valve (14) and the fourth valve (15) are opened, and the second valve (11) is closed; steam enters the first steam turbine set (1) from the second steam turbine set (12) through the third valve (14) to push the first steam turbine set (1) to rotate at a high speed, and dead steam at the outlet of the first steam turbine set (1) enters the condenser (13) through the fourth valve (15) to be condensed into water and then continues to enter a thermal system of the coal-fired unit; the first turbine set (1) drives a compressor (2) to compress air through a connecting shaft, the obtained high-temperature and high-pressure air enters a cooler (3), a low-temperature heat storage medium enters the cooler (3) from a heat storage system cold tank (8) through a first valve (9) to cool the high-temperature and high-pressure air, the obtained high-temperature heat storage medium is stored in a heat storage system hot tank (10), the normal-temperature and high-pressure air at the high-temperature side outlet of the cooler (3) is cooled and liquefied through a gas-liquid conversion device (4), and the low-temperature liquid air enters a liquid air storage tank (5) to be stored;
energy release mode: starting an energy release mode when the power consumption peak of a power grid and the power generation load of a coal-fired unit need to be lifted, closing a first valve (9), a third valve (14) and a fourth valve (15), and opening a second valve (11); the low-temperature liquid air flows out from the liquid air storage tank (5), normal-temperature high-pressure air generated after cold energy recovery is carried out through the gas-liquid conversion device (4) enters the heater (6), high-temperature heat storage medium enters the heater (6) through the second valve (11) from the heat storage system hot tank (10) to heat the normal-temperature high-pressure air, the obtained low-temperature heat storage medium is stored in the heat storage system cold tank (8), the high-temperature high-pressure air at the low-temperature side outlet of the heater (6) enters the expansion machine (7) to be expanded to work and output electric energy, and the normal-pressure normal-temperature air at the outlet of the expansion machine (7) is discharged.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111928525A (en) * | 2020-08-07 | 2020-11-13 | 西安西热节能技术有限公司 | Liquefied air energy storage peak regulation system and method based on waste heat refrigeration |
| CN111928511A (en) * | 2020-08-07 | 2020-11-13 | 西安西热节能技术有限公司 | Liquefied air energy storage peak shaving system and method based on compressor intermediate suction |
| CN111928524A (en) * | 2020-08-07 | 2020-11-13 | 西安西热节能技术有限公司 | Liquefied air energy storage peak regulation system and method based on pre-stage cooling |
| CN112096470A (en) * | 2020-09-29 | 2020-12-18 | 西安热工研究院有限公司 | Liquid compressed air energy storage peak shaving system and method coupled with heat supply system |
| CN112627912A (en) * | 2020-11-30 | 2021-04-09 | 浙江大学 | Energy-saving system for supplying compressed air to steam drive of thermal power plant |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111928525A (en) * | 2020-08-07 | 2020-11-13 | 西安西热节能技术有限公司 | Liquefied air energy storage peak regulation system and method based on waste heat refrigeration |
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| CN112627912A (en) * | 2020-11-30 | 2021-04-09 | 浙江大学 | Energy-saving system for supplying compressed air to steam drive of thermal power plant |
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