CN115653717A - Compressed water energy storage device with stable pressure and control method thereof - Google Patents
Compressed water energy storage device with stable pressure and control method thereof Download PDFInfo
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- CN115653717A CN115653717A CN202211281052.1A CN202211281052A CN115653717A CN 115653717 A CN115653717 A CN 115653717A CN 202211281052 A CN202211281052 A CN 202211281052A CN 115653717 A CN115653717 A CN 115653717A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Abstract
The invention discloses a compressed water energy storage device with stable pressure and a control method thereof, wherein the device comprises a waste heat utilization heat exchanger, a steam compressor, a heat exchanger, an expansion turbine, a heat storage tank, a high-pressure water storage tank, a hydraulic turbine, a low-pressure water storage tank and a booster water pump; the method adopts the combined configuration of the waste heat utilization heat exchanger, the water vapor compressor, the heat exchanger, the expansion turbine and other equipment, can realize the high-efficiency recovery and storage of low-temperature waste heat, wherein the temperature of the available waste heat resources can be 25-150 ℃, and the system can maximally increase the temperature to about 300 ℃, thereby improving the efficiency of the system. The invention can solve the problems of peak regulation, energy storage and the like in the prior art.
Description
Technical Field
The invention relates to a peak shaving energy storage device and a control method thereof, in particular to a compressed water energy storage device with stable pressure and a control method thereof.
Background
The energy storage technology is one of the key research directions in the future energy field, the existing energy storage technology comprises pumped storage, compressed air energy storage, electrochemical energy storage and the like, but the pumped storage has the problems of terrain limitation and the like; the compressed air energy storage has the problems of low energy storage efficiency, low energy density and the like; the electrochemical energy storage has the problems of scale grade limitation and the like. The technology of the compressed water energy storage device based on thermal mass energy storage has some limitations:
1. the system is relatively closed-loop, and the external low-temperature waste heat is difficult to utilize, so that the problems of energy waste, difficulty in improving the energy storage efficiency of the system and the like are caused;
2. in the energy storage process of the system, high-pressure water storage is carried out only by using a water pump, so that the storage capacity is limited, and the system is difficult to apply to large-scale scenes;
3. the system neglects the problems of pressure drop and the like caused by the release of the working medium in the tank in the energy release process, the actual operation efficiency is often low, and the requirement is difficult to meet.
Disclosure of Invention
The invention aims to provide a compressed water energy storage device with stable pressure and a control method thereof, so as to solve the problems of peak shaving energy storage and the like in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a compressed water energy storage device with stable pressure comprises a waste heat utilization heat exchanger, a steam compressor, a heat exchanger, an expansion turbine, a heat storage tank, a high-pressure water storage tank, a hydraulic turbine, a low-pressure water storage tank and a booster water pump, wherein the waste heat utilization heat exchanger is connected with the waste heat utilization heat exchanger;
a first outlet of the waste heat utilization heat exchanger is connected to a water vapor compressor, an outlet of the water vapor compressor is connected with a first inlet of the heat exchanger, a first outlet of the heat exchanger is connected to an expansion turbine, a first outlet of the heat exchanger is connected to a first inlet of a high-pressure water storage tank, an outlet of the expansion turbine is connected with a first inlet of the waste heat utilization heat exchanger, and a first outlet of a low-pressure water storage tank is also connected with a first inlet of the waste heat utilization heat exchanger;
a second outlet of the heat exchanger is connected to a first inlet of the heat storage tank, a first outlet of the heat storage tank is connected to a second inlet of the heat exchanger, a second outlet of the heat storage tank is connected to a second inlet of the high-pressure water storage tank, and a first outlet of the high-pressure water storage tank is connected with a second inlet of the heat storage tank;
the second outlet of the low-pressure water storage tank is connected to the inlet of a booster water pump, the outlet of the booster water pump is connected with the third inlet of the high-pressure water storage tank, the second outlet of the high-pressure water storage tank is connected with the inlet of a hydraulic turbine, and the outlet of the hydraulic turbine is connected to the inlet of the low-pressure water storage tank.
A further development of the invention is that the first outlet of the heat exchanger is connected to the expansion turbine via a first control valve.
The invention is further improved in that the first outlet of the low-pressure water storage tank is also connected with the first inlet of the waste heat utilization heat exchanger through a second control valve.
A further development of the invention is that the first outlet of the heat storage tank is connected to the second inlet of the heat exchanger via a third control valve.
A further improvement of the invention is that the second outlet of the heat storage tank is connected to the second inlet of the high pressure water storage tank by a fourth control valve.
The invention is further improved in that the first outlet of the heat exchanger is connected to the first inlet of the high-pressure water storage tank through a fifth control valve.
The invention is further improved in that the second outlet of the high-pressure water storage tank is connected with the inlet of the hydraulic turbine through a sixth control valve.
A further development of the invention provides that the second outlet of the low-pressure water storage tank is connected to the inlet of the booster water pump via a seventh control valve.
A method of controlling a pressure stabilized compressed water energy storage device, the method being based on said one pressure stabilized compressed water energy storage device, comprising:
when heat storage is needed, the first control valve and the third control valve are opened, and the other control valves are closed; the low-pressure water absorbs heat and evaporates through the waste heat utilization heat exchanger to become vapor, then enters the vapor compressor to complete compression, the vapor after temperature rise and pressure rise enters the heat exchanger to release heat, the heat is transferred to the heat storage medium, then the water enters the expansion turbine through the first control valve to do work, and then returns to the waste heat utilization heat exchanger to complete circulation; the heat storage medium flows out of the heat storage tank, enters the heat exchanger through the third control valve, absorbs heat and returns to the heat storage tank to realize heat storage;
when high-pressure water needs to be stored, opening the second control valve, the third control valve, the fifth control valve and the seventh control valve, and closing the other control valves; low-pressure water in the low-pressure water storage tank flows through the waste heat utilization heat exchanger through the second control valve to absorb heat and evaporate, then enters the water vapor compressor to complete compression, the water vapor after temperature rise and pressure rise enters the heat exchanger to release heat, heat is transferred to the heat storage medium, and then the water enters the high-pressure water storage tank through the fifth control valve to be stored; in addition, low-pressure water in the low-pressure water storage tank flows to the booster water pump through the seventh control valve, and enters the high-pressure water storage tank for storage after being boosted; similarly, the heat storage medium flows out of the heat storage tank, enters the heat exchanger through the third control valve, absorbs heat and returns to the heat storage tank to realize heat storage;
when energy release is needed, the fourth control valve and the sixth control valve are opened, and the other control valves are closed; the heat storage medium of the heat storage tank enters the high-pressure water storage tank through the fourth control valve to heat the high-pressure water, the high-pressure water absorbs heat and becomes saturated vapor, part of the high-pressure water is discharged to the hydraulic turbine through the sixth control valve to do work and release energy, and the water which does work returns to the low-pressure water storage tank to complete the working process; at this time, since the water storage tank is saturated water and saturated steam, the temperature in the water storage tank is maintained by adjusting the heating amount to keep the pressure in the tank constant.
The invention is further improved in that the heat which can be utilized by the waste heat utilization heat exchanger comprises industrial waste heat and waste heat, and the temperature is 25-150 ℃.
Compared with the prior art, the invention has the following beneficial effects:
1. the combined configuration of the waste heat utilization heat exchanger, the water vapor compressor, the heat exchanger, the expansion turbine and other equipment is adopted, so that the high-efficiency recovery and storage of low-temperature waste heat can be realized, the temperature of the available waste heat resources can be 25-150 ℃, and the system can be maximally lifted to about 300 ℃, so that the system efficiency is improved;
2. a low-pressure water storage tank, a heat exchanger, a steam compressor, a heat exchanger and a high-pressure water storage tank loop are added in the system, water can be compressed by the steam compressor, high-pressure water is obtained, and the capacity of storing the high-pressure water is further improved;
3. the heat storage tank and the high-pressure water storage tank are arranged, the water storage tank is heated through heat in the heat storage tank, and the stable pressure output of high-pressure water can be realized through the gas-liquid phase change principle of water, so that the circulating pressure can not be reduced due to the release of a working medium in the energy release process of the system, and the operation efficiency of the system is further improved.
Drawings
Fig. 1 is a schematic diagram of a pressure stabilized compressed water energy storage device of the present invention.
Description of reference numerals:
1. the system comprises a waste heat utilization heat exchanger, 2, a water vapor compressor, 3, a heat exchanger, 4, an expansion turbine, 5, a heat storage tank, 6, a high-pressure water storage tank, 7, a hydraulic turbine, 8, a low-pressure water storage tank, 9, a booster water pump, 101, a first control valve, 102, a second control valve, 103, a third control valve, 104, a fourth control valve, 105, a fifth control valve, 106, a sixth control valve, 107 and a seventh control valve.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides a compressed water energy storage device with stable pressure, including: the waste heat utilization system comprises a waste heat utilization heat exchanger 1, a water vapor compressor 2, a heat exchanger 3, an expansion turbine 4, a heat storage tank 5, a high-pressure water storage tank 6, a hydraulic turbine 7, a low-pressure water storage tank 8 and a booster water pump 9, and further comprises a first control valve 101, a second control valve 102, a third control valve 103, a fourth control valve 104, a fifth control valve 105, a sixth control valve 106 and a seventh control valve 107.
The first outlet of the waste heat utilization heat exchanger 1 is connected to the steam compressor 2, the outlet of the steam compressor 2 is connected to the first inlet of the heat exchanger 3, the first outlet of the heat exchanger 3 is connected to the expansion turbine 4 through the first control valve 101, the first outlet of the heat exchanger 3 is connected to the first inlet of the high-pressure water storage tank 6 through the fifth control valve 105, the outlet of the expansion turbine 4 is connected to the first inlet of the waste heat utilization heat exchanger 1, and the first outlet of the low-pressure water storage tank 8 is also connected to the first inlet of the waste heat utilization heat exchanger 1 through the second control valve 102.
A second outlet of the heat exchanger 3 is connected to a first inlet of the heat storage tank 5, a first outlet of the heat storage tank 5 is connected to a second inlet of the heat exchanger 3 through a third control valve 103, a second outlet of the heat storage tank 5 is connected to a second inlet of the high-pressure water storage tank 6 through a fourth control valve 104, and a first outlet of the high-pressure water storage tank 6 is connected to a second inlet of the heat storage tank 5.
A second outlet of the low-pressure water storage tank 8 is connected to an inlet of a booster water pump 9 through a seventh control valve 107, an outlet of the booster water pump 9 is connected to a third inlet of the high-pressure water storage tank 6, a second outlet of the high-pressure water storage tank 6 is connected to an inlet of a hydraulic turbine 7 through a sixth control valve 106, and an outlet of the hydraulic turbine 7 is connected to an inlet of the low-pressure water storage tank 8.
A method of controlling a pressure stabilized compressed water energy storage device, comprising:
when heat storage is required, the first control valve 101 and the third control valve 103 are opened, and the remaining control valves are closed. The low-pressure water absorbs heat and evaporates through the waste heat utilization heat exchanger 1 to become steam, then enters the steam compressor 2 to complete compression, the steam after temperature rise and pressure rise enters the heat exchanger 3 to release heat, after heat is transferred to the heat storage medium, the water enters the expansion turbine 4 through the first control valve 101 to do work, and then returns to the waste heat utilization heat exchanger 1 to complete circulation. The heat storage medium flows out of the heat storage tank 5, enters the heat exchanger 3 through the third control valve 103, absorbs heat, and returns to the heat storage tank 5 to realize heat storage.
When it is necessary to store high pressure water, the second control valve 102, the third control valve 103, the fifth control valve 105, and the seventh control valve 107 are opened, and the remaining control valves are closed. The low-pressure water in the low-pressure water storage tank 8 flows through the waste heat utilization heat exchanger 1 through the second control valve 102 to absorb heat and evaporate, then enters the water vapor compressor 2 to complete compression, the water vapor after temperature rise and pressure rise enters the heat exchanger 3 to release heat, heat is transferred to the heat storage medium, and then the water enters the high-pressure water storage tank 6 through the fifth control valve 105 to be stored. In addition, the low-pressure water in the low-pressure water storage tank 8 flows to the booster water pump 9 through the seventh control valve 107, and enters the high-pressure water storage tank 6 for storage after being boosted. Similarly, the heat storage medium flows out of the heat storage tank 5, enters the heat exchanger 3 through the third control valve 103, absorbs heat, and returns to the heat storage tank 5 to store heat.
When energy release is required, the fourth control valve 104 and the sixth control valve 106 are opened, and the remaining control valves are closed. The heat storage medium of the heat storage tank 5 enters the high-pressure water storage tank 6 through the fourth control valve 104 to heat the high-pressure water, the high-pressure water absorbs heat and becomes saturated vapor, part of the high-pressure water is discharged to the hydraulic turbine 7 through the sixth control valve 106 to do work and release energy, and the water which does do work returns to the low-pressure water storage tank 8 to complete the work flow. At this time, since the water storage tank 6 is filled with saturated water and saturated steam, the temperature in the water storage tank 6 can be maintained by adjusting the heating amount to keep the pressure in the tank constant, thereby improving the degree of work stability.
Further, the heat available by the waste heat utilization heat exchanger 1 includes industrial waste heat, waste heat and the like, and the temperature can be 25-150 ℃.
The method can realize that: the energy storage device absorbs off-peak power during the off-peak period of power utilization to store energy and releases the energy during the on-peak period of power utilization, so that the peak shifting and valley filling of the power are realized, and the energy storage device has higher energy storage efficiency.
The method has the following specific advantages:
1. the combined configuration of the waste heat utilization heat exchanger, the water vapor compressor, the heat exchanger, the expansion turbine and other equipment is adopted, so that the low-temperature waste heat can be efficiently recovered and stored;
2. a low-pressure water storage tank, a heat exchanger, a steam compressor, a heat exchanger and a high-pressure water storage tank loop are added in the system, so that the capacity of storing high-pressure water can be further improved;
3. set up heat storage tank, high pressure water storage tank to utilize the heat heating water storage tank in the heat storage tank, can realize the steady voltage output of water under high pressure through the gas-liquid phase transition principle of water, promote system operating efficiency.
In summary, the present invention provides a compressed water energy storage device with stable pressure and a control method thereof, which can efficiently realize thermoelectric storage and conversion, are less limited by terrain and the like, and can be adjusted according to user requirements to reduce the cost of user electricity.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (10)
1. A compressed water energy storage device with stable pressure is characterized by comprising a waste heat utilization heat exchanger, a steam compressor, a heat exchanger, an expansion turbine, a heat storage tank, a high-pressure water storage tank, a hydraulic turbine, a low-pressure water storage tank and a booster water pump;
a first outlet of the waste heat utilization heat exchanger is connected to a water vapor compressor, an outlet of the water vapor compressor is connected with a first inlet of the heat exchanger, a first outlet of the heat exchanger is connected to an expansion turbine, a first outlet of the heat exchanger is connected to a first inlet of a high-pressure water storage tank, an outlet of the expansion turbine is connected with a first inlet of the waste heat utilization heat exchanger, and a first outlet of a low-pressure water storage tank is also connected with a first inlet of the waste heat utilization heat exchanger;
a second outlet of the heat exchanger is connected to a first inlet of the heat storage tank, a first outlet of the heat storage tank is connected to a second inlet of the heat exchanger, a second outlet of the heat storage tank is connected to a second inlet of the high-pressure water storage tank, and a first outlet of the high-pressure water storage tank is connected with a second inlet of the heat storage tank;
the second outlet of the low-pressure water storage tank is connected to the inlet of a booster water pump, the outlet of the booster water pump is connected with the third inlet of the high-pressure water storage tank, the second outlet of the high-pressure water storage tank is connected with the inlet of a hydraulic turbine, and the outlet of the hydraulic turbine is connected to the inlet of the low-pressure water storage tank.
2. A pressurised, compressed water storage unit according to claim 1 wherein the first outlet of the heat exchanger is connected to the expansion turbine via a first control valve.
3. A pressurised, stabilised water storage apparatus according to claim 2, in which the first outlet of the low pressure water storage tank is also connected to the first inlet of the waste heat utilising heat exchanger via a second control valve.
4. A pressurised, compressed water storage apparatus as claimed in claim 3 wherein the first outlet of the thermal storage tank is connected to the second inlet of the heat exchanger via a third control valve.
5. A pressurised, compressed water storage apparatus as claimed in claim 4 wherein the second outlet of the thermal storage tank is connected to the second inlet of the high pressure water storage tank via a fourth control valve.
6. A pressurised, stabilised water storage apparatus according to claim 5, in which the first outlet of the heat exchanger is connected to the first inlet of the high pressure water storage tank by a fifth control valve.
7. A pressurised, compressed water storage apparatus as claimed in claim 6 in which the second outlet of the high pressure water storage tank is connected to the inlet of the water turbine via a sixth control valve.
8. A pressurised, stabilised water storage apparatus according to claim 7, wherein the second outlet of the low pressure water storage tank is connected to the inlet of the pressurised water pump via a seventh control valve.
9. A method for controlling a pressure stabilized compressed water energy storage device, which is based on the pressure stabilized compressed water energy storage device of claim 8, comprising:
when heat storage is needed, the first control valve and the third control valve are opened, and the other control valves are closed; the low-pressure water absorbs heat and evaporates through the waste heat utilization heat exchanger to become vapor, then enters the vapor compressor to complete compression, the vapor after temperature rise and pressure rise enters the heat exchanger to release heat, the heat is transferred to the heat storage medium, then the water enters the expansion turbine through the first control valve to do work, and then returns to the waste heat utilization heat exchanger to complete circulation; the heat storage medium flows out of the heat storage tank, enters the heat exchanger through the third control valve, absorbs heat and returns to the heat storage tank to realize heat storage;
when high-pressure water needs to be stored, opening the second control valve, the third control valve, the fifth control valve and the seventh control valve, and closing the other control valves; low-pressure water in the low-pressure water storage tank flows through the waste heat utilization heat exchanger through the second control valve to absorb heat and evaporate, then enters the water vapor compressor to complete compression, the water vapor after temperature rise and pressure rise enters the heat exchanger to release heat, heat is transferred to the heat storage medium, and then the water enters the high-pressure water storage tank through the fifth control valve to be stored; in addition, low-pressure water in the low-pressure water storage tank flows to the booster water pump through the seventh control valve, and enters the high-pressure water storage tank for storage after being boosted; similarly, the heat storage medium flows out of the heat storage tank, enters the heat exchanger through the third control valve to absorb heat and then returns to the heat storage tank to realize heat storage;
when energy release is needed, the fourth control valve and the sixth control valve are opened, and the other control valves are closed; the heat storage medium of the heat storage tank enters the high-pressure water storage tank through the fourth control valve to heat the high-pressure water, the high-pressure water absorbs heat and becomes saturated vapor, part of the high-pressure water is discharged to the hydraulic turbine through the sixth control valve to do work and release energy, and the water which does work returns to the low-pressure water storage tank to complete the working process; at this time, since the water storage tank is saturated water and saturated steam, the temperature in the water storage tank is maintained by adjusting the heating amount to keep the pressure in the tank constant.
10. The method for controlling a pressure stabilized compressed water energy storage device according to claim 9, wherein the heat utilizable by the waste heat utilizing heat exchanger includes industrial waste heat and waste heat, and the temperature is 25-150 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211281052.1A CN115653717A (en) | 2022-10-19 | 2022-10-19 | Compressed water energy storage device with stable pressure and control method thereof |
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| CN202211281052.1A CN115653717A (en) | 2022-10-19 | 2022-10-19 | Compressed water energy storage device with stable pressure and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116202128A (en) * | 2023-02-23 | 2023-06-02 | 中国电建集团河北省电力勘测设计研究院有限公司 | Method for heating by utilizing compressed air energy storage compression heat waste heat |
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2022
- 2022-10-19 CN CN202211281052.1A patent/CN115653717A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116202128A (en) * | 2023-02-23 | 2023-06-02 | 中国电建集团河北省电力勘测设计研究院有限公司 | Method for heating by utilizing compressed air energy storage compression heat waste heat |
| CN116202128B (en) * | 2023-02-23 | 2023-10-03 | 中国电建集团河北省电力勘测设计研究院有限公司 | Method for heating by utilizing compressed air energy storage compression heat waste heat |
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