CN113819508A - Coupling power system with geothermal recovery function and operation method thereof - Google Patents
Coupling power system with geothermal recovery function and operation method thereof Download PDFInfo
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- CN113819508A CN113819508A CN202111112600.3A CN202111112600A CN113819508A CN 113819508 A CN113819508 A CN 113819508A CN 202111112600 A CN202111112600 A CN 202111112600A CN 113819508 A CN113819508 A CN 113819508A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
- F24D11/003—Central heating systems using heat accumulated in storage masses water heating system combined with solar energy
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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
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
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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
- F04B37/12—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high pressure
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
- F24D11/004—Central heating systems using heat accumulated in storage masses water heating system with conventional supplementary heat source
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/40—Solar heat collectors combined with other heat sources, e.g. using electrical heating or heat from ambient air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
- F24S23/74—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with trough-shaped or cylindro-parabolic reflective surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
- F24S80/30—Arrangements for connecting the fluid circuits of solar collectors with each other or with other components, e.g. pipe connections; Fluid distributing means, e.g. headers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/30—Thermophotovoltaic systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/32—Heat sources or energy sources involving multiple heat sources in combination or as alternative heat sources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/20—Solar thermal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 provides a coupling power system with a geothermal recovery function and an operation method thereof, wherein the system comprises a compressed air energy storage unit, a solar photovoltaic photo-thermal unit, a geothermal well and a heat supply unit; the heat energy of the compressed air is stored in a geothermal well, the solar photovoltaic photo-thermal unit converts solar energy into electric energy and heat energy respectively to provide the electric energy and the heat energy for the system respectively, and the collected solar heat energy is used for supplying heat and heating a heat exchange medium in the compressed air energy storage unit; the heat supply module makes full use of solar energy, supplies heat to the outside, and the coupling is carried out compressed air energy storage and photovoltaic, light and heat system, avoids the use of thermal storage equipment among the compressed air energy storage system, has carried out effective utilization with the heat of compression simultaneously, has satisfied current heat supply demand when recovering heat in the geothermal well, realizes energy storage, heat supply and the effect of recovering geothermol power, helps the popularization and the application of geothermol power utilization and compressed air energy storage technique.
Description
Technical Field
The invention belongs to the technical field of physical energy storage, and particularly relates to a coupling power system with a geothermal recovery function and an operation method thereof.
Background
Geothermal energy is the clean heat energy of renewability that comes from earth's depths, and the deep circulation of groundwater is taken the heat to near the top layer from underground depths, and reasonable development utilizes and is favorable to resource saving and environmental protection, accords with green development theory. With the promotion of urbanization construction and the continuous development of cities, the energy demand is continuously increased, and under the current environmental protection pressure, the stability of geothermal energy heating is kept and the utilization efficiency of geothermal energy is increased very urgently. The new industry development aims to increase 11 hundred million square meters of geothermal heating and cooling area, wherein 7 hundred million square meters of shallow geothermal heating and cooling area and 4 hundred million square meters of intermediate geothermal heating area are increased to 16 hundred million square meters in 2020, and heating is mainly carried out in northern areas. With the widespread use of geothermal energy, the problems of geothermal utilization exposure are increasing, wherein imbalance and mismatch between heat recovery and heat supply in geothermal wells are one of the main problems. In the using process of the geothermal well, the heating heat which can be provided presents the trend of decreasing year by year, and to a certain degree, the phenomenon that the geothermal well can not meet the normal heating demand can occur. Meanwhile, in a compressed air energy storage system, the utilization degree of low-quality compression heat is low, and reasonable and efficient utilization of the low-quality compression heat is also one of the technical difficulties of physical energy storage.
Disclosure of Invention
In order to solve the problems that heat in a geothermal well is difficult to recover and geothermal supply and heat supply requirements are not matched in the prior art, the invention aims to provide a coupling power system with a geothermal recovery function and an operation method thereof.
The invention is realized by the following technical scheme: a coupling power system with a geothermal recovery function comprises a compressed air energy storage unit, a solar photovoltaic photo-thermal unit, a geothermal well and a heat supply unit; the compressed air energy storage unit comprises a compressor set, a first heat exchanger, an isothermal compression module and a second heat exchanger which are sequentially communicated, the heat fluid side of the second heat exchanger is also communicated with the cold fluid side of the first heat exchanger, and the cold fluid outlet of the second heat exchanger is communicated with the air inlet of the geothermal well; the solar photovoltaic photo-thermal unit comprises a condenser, a frequency divider, a photovoltaic module, a first heat collecting device and a second heat collecting device, wherein the frequency divider is arranged behind the condenser and is respectively connected with the photovoltaic module, the first heat collecting device and the second heat collecting device; the heat supply unit comprises a first water storage tank, a second water storage tank and a heat supply module, the heat supply module is respectively connected with the first water storage tank, the second water storage tank, a heat exchange working medium outlet of a first heat collection device and a frequency divider, an inlet of the first water storage tank is connected with an outlet of the geothermal well, and a first water pump is arranged between the first water storage tank and the second water storage tank; the photovoltaic module is used for supplying power for the first water pump and the gas compressor set respectively.
The isothermal compression module comprises a first water gas tank, a second water gas tank, a water tank and a second water pump, wherein gas inlets of the first water gas tank and the second water gas tank are connected in parallel with a gas exhaust pipeline of the gas compressor, gas outlets of the first water gas tank and the second water gas tank are connected in parallel with a gas inlet of the geothermal well, and the second water pump communicates the first water gas tank and the second water gas tank through a pipeline to realize that the two tanks are alternately charged and discharged; the first water tank and the second water tank are immersed in a water tank filled with water, and the photovoltaic module supplies power to the second water pump.
The first water tank and the second water tank are internally and externally provided with antirust coatings, the tank body is internally and externally provided with annular fins which are alternately arranged, and the internal fins and the external fins are positioned at different horizontal positions; first water gas jar and second water gas jar are provided with the water inlet of intercommunication water tank inner space, water inlet department sets up the valve, and the water in the water tank supplyes the water in first water gas jar and the second water gas jar.
The geothermal well is a U-shaped well with a central pipe sleeve and communicated with the bottom; the geothermal well comprises an outer pipe sleeve and an inner pipe sleeve, air enters from the outer pipe sleeve of the geothermal well, and water is discharged from the central pipe sleeve; the air is stored in the geothermal well and stands still for at least 6 hours.
The heat supply module comprises a primary heat supply unit, a secondary heat supply unit, a tertiary heat supply unit, a quaternary heat supply unit, a heat collecting pipe, a fixed groove type condenser and a heat exchange pipe; the heat collecting pipe is communicated with the heat exchange pipe in the first heat supply unit; the heat exchange tube in the second heat supply unit is communicated with the outlet of the first heat collecting device; a heat exchange pipe in the third heat supply unit is communicated with the second water storage tank; a heat exchange pipe in the fourth heat supply unit is communicated with the first water storage tank; heat insulation layers are arranged between every two adjacent heat supply units; the heat supply module is used for heat insulation treatment integrally, and the primary heat supply unit, the secondary heat supply unit, the tertiary heat supply unit, the quaternary heat supply unit and the heat collecting pipes are filled with heat storage media.
The photovoltaic module adopts a flat single-shaft tracking system and adopts an N-type IBC double-sided half cell assembly; the first heat collecting device and the second heat collecting device adopt linear Fresnel type heat collecting devices.
The compressor unit adopts a double-screw compressor; the first heat exchanger and the second heat exchanger adopt a shell-and-tube heat exchanger countercurrent arrangement mode, the first water storage tank and the second water storage tank are subjected to adiabatic treatment, and the second water storage tank is preset with water-insoluble gas with a set volume.
The operation method of the coupling power system with the geothermal recovery function is based on the following specific steps:
air is compressed by a compressor unit and then enters a first heat exchanger; the air enters the isothermal compression module after being subjected to heat release in the first heat exchanger, enters the second heat exchanger to absorb heat after being pressurized in the isothermal compression module, and enters the geothermal well to store energy after absorbing heat; meanwhile, the heat exchange working medium absorbs compression heat in the first heat exchanger, then absorbs heat in the first heat collecting device, the compressed air is heated in the second heat exchanger, and the heat-released heat exchange working medium enters the first heat exchanger again to absorb the compression heat; the water in the geothermal well is discharged through the central pipe sleeve and enters the first water storage tank, and the water in the first water storage tank absorbs heat in the second heat collection device after being pressurized by the first water pump and is stored in the second water storage tank;
after being gathered by the condenser, the sunlight is divided into a part suitable for photovoltaic power generation and a part suitable for photo-thermal heat collection by the frequency divider according to the wavelength; the photovoltaic power generation module provides electric energy for the compressor unit and the first water pump; the first heat collecting device, the second heat collecting device and the heat supply module absorb light suitable for photo-thermal heat collection.
The heat supply module is divided into different heat supply grades according to the temperature, the temperature is sequentially from high to low, the first-level heat supply, the second-level heat supply, the third-level heat supply and the fourth-level heat supply, the first-level heat supply directly collects heat through sunlight, and the heat supply temperature is 250-300 ℃; secondary heat supply is supplied after heat absorption of a heat exchange working medium in the first heat collection device, and the heat supply temperature is 150-250 ℃; the third-level heat supply is carried out through a second water storage tank, and the heat supply temperature is 80-150 ℃; the four-stage heat supply is realized by the first water storage tank, and the heat supply temperature is 30-80 ℃.
The heat exchange working medium arranged at the outlet of the first heat collecting device between the two heat exchangers selectively supplies heat to the heat supply module; the sunlight suitable for photo-thermal heat collection is selectively distributed to one or more of the first heat collection device, the heat supply module and the second heat collection device.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the invention, the compressed air energy storage system, the geothermal well and the photo-thermal system are coupled, so that low-grade compressed heat is fully utilized, a heat storage device is prevented from being arranged in the compressed air energy storage system, the geothermal energy recovery effect is realized, the energy storage function is realized, heat energy is introduced into the geothermal pipe, solar energy is fully utilized based on the photoelectric and photo-thermal principles, the frequency division technology is adopted, the operating temperature of a photovoltaic cell is effectively reduced, and the photo-thermal utilization temperature is increased; by combining a solar photovoltaic photo-thermal technology, the geothermal energy recovery effect is enhanced, the cost of the gas storage process is saved by utilizing photovoltaic power generation, and the flexibility of the system is improved; investment is effectively saved, the utilization rate of renewable energy sources is improved, and meanwhile the reliability and sustainability of a geothermal system are improved.
Furthermore, heat supply in different temperature intervals can be realized by compressing heat, photo-thermal, geothermal and other heat sources for heat supply, so that efficient energy utilization is realized, and the heat demand of a user during the recovery period of the geothermal well is ensured.
Furthermore, the double-screw compressor is matched with the isothermal compression module, so that the waste of compression heat is reduced on the premise of realizing effective pressurization.
Furthermore, the isothermal compression module effectively controls the temperature rise in the compression process and improves the compression efficiency by means of configuring the fins on the tank body and immersing the tank body in the water tank.
Furthermore, the liquid water is pressurized by the water pump and then subjected to heat collection, so that the boiling point of the water is improved, and the heat storage capacity of the water is effectively improved.
Drawings
Fig. 1 shows a coupling power system with geothermal recovery according to the present invention.
In fig. 1: 1. a condenser; 2. a frequency divider; 3. a photovoltaic module; 4. an electric motor; 5. a compressor unit; 6. a first heat exchanger; 7. a water tank; 71. a first water gas tank; 72. a second water gas tank; 8. a second water pump; 9. a second heat exchanger; 10. geothermal wells or buried pipes; 11. a first heat collecting device; 12. a second heat collecting device; 13. a second water storage tank; 14. a first water storage tank; 15. a first water pump; 16. a heat supply module; 161. a primary heat supply unit; 162. a secondary heat supply unit; 163. a third-stage heat supply unit; 164. a four-stage heat supply unit; 165. a heat collecting pipe; 166. a fixed trough concentrator; 167. a heat exchange pipe; 168. a heat insulating layer.
FIG. 2 is a schematic top view of a geothermal well according to the present invention.
FIG. 3 is a schematic representation of the direction of air flow in a geothermal well according to the invention.
Fig. 4 is a schematic view of the inner and outer fins of the water vapor tank of the present invention.
Fig. 5 is a perspective view of the heating module.
Fig. 6 is a left side view of the heating module.
Detailed Description
The present invention will be described in detail below with reference to the following detailed description and the accompanying drawings.
The novel compressed air energy storage system is coupled with the photovoltaic and photo-thermal system, so that the use of a heat storage device in the compressed air energy storage system is avoided, the compressed heat is effectively utilized, the heat in a geothermal well is recovered, the current heat supply requirement is met, the comprehensive effects of energy storage, heat supply and geothermal heat recovery are realized, and the heat supply in different temperature intervals is realized due to the diversity of heat sources in the system.
As shown in fig. 1, a coupled power system with geothermal recovery function includes a compressed air energy storage unit, a solar photovoltaic photo-thermal unit, a geothermal well 10 and a heat supply unit;
the system comprises a condenser 1, a frequency divider 2, a photovoltaic module 3, a motor 4, a compressor unit 5, a first heat exchanger 6, a water tank 7, a first water tank 71, a second water tank 72, a second water pump 8, a second heat exchanger 9, a geothermal well or a buried pipe 10, a first heat collection device 11, a second heat collection device 12, a second water storage tank 13, a first water storage tank 14, a first water pump 15 and a heat supply module 16; the compressed air energy storage unit comprises a compressor set 5, a first heat exchanger 6, an isothermal compression module and a second heat exchanger 9 which are sequentially communicated, a heat fluid side of the second heat exchanger 9 is also communicated with a cold fluid side of the first heat exchanger 6, and a cold fluid outlet of the second heat exchanger 9 is communicated with an air inlet of a geothermal well 10; the solar photovoltaic photo-thermal unit comprises a condenser 1, a frequency divider 2, a photovoltaic module 3, a first heat collecting device 11 and a second heat collecting device 12, wherein the frequency divider 2 is arranged behind the condenser 1, the frequency divider 2 is respectively connected with the photovoltaic module 3, the first heat collecting device 11 and the second heat collecting device 12, and the first heat collecting device 11 is arranged on a pipeline for communicating the second heat exchanger 9 and the first heat exchanger 6; the heat supply unit comprises a first water storage tank 14, a second water storage tank 13 and a heat supply module 16, the heat supply module 16 is respectively connected with the first water storage tank 14, the second water storage tank 13, a heat exchange working medium outlet of a first heat collection device 11 and the frequency divider 2, an inlet of the first water storage tank 14 is connected with an outlet of the geothermal well 10, and a first water pump 15 is arranged between the first water storage tank 14 and the second water storage tank 13; the photovoltaic module 3 supplies power to the first water pump 15 and the compressor unit 5, respectively.
The geothermal well 10 is a U-shaped well with a central casing communicating at the bottom.
The isothermal compression module comprises a first water gas tank 71, a second water gas tank 72, a water tank 7 and a second water pump 8; the air inlets of the first water tank 71 and the second water tank 72 are connected in parallel with the exhaust pipeline of the compressor 5; the exhaust ports of the first water gas tank 71 and the second water gas tank 72 are connected in parallel with the air inlet of the geothermal well 10; the first water tank 71 and the second water tank 72 are communicated through a pipeline of the second water pump 8, so that the two tanks are alternately filled with water; the first and second water gas tanks 71 and 72 are tank-submerged in the water tank 7 containing water.
The motor 4 of the compressor set 5 and the motors of the second water pump 8 and the first water pump 15 are connected with the photovoltaic module 3 and are driven by photovoltaic electricity.
The compressor block 5 employs a twin-screw compressor.
The first water tank 71 and the second water tank 72 are both internally and externally provided with antirust coatings, and annular fins are arranged inside and outside the tank bodies.
The first heat exchanger 6 and the second heat exchanger 9 adopt shell-and-tube heat exchangers, and cold and hot fluids perform countercurrent heat exchange.
The invention relates to an operation method of a coupling power system with a geothermal recovery function, which comprises the following specific steps:
air is compressed by a compressor unit 5 and then enters a first heat exchanger 6; the air enters the isothermal compression module after being radiated in the first heat exchanger 6, enters the second heat exchanger 9 to absorb heat after being pressurized in the isothermal compression module, and the air after absorbing heat is stored in the geothermal well 10 from the outer sleeve of the geothermal well 10 to finish energy storage. Meanwhile, the heat exchange working medium absorbs compression heat in the first heat exchanger 6, then absorbs light heat in the first heat collecting device 11, heats compressed air in the second heat exchanger 9, and the heat-released heat exchange working medium enters the first heat exchanger 6 again to absorb the compression heat.
The water in the geothermal well 10 is discharged through the central pipe sleeve and enters the first water storage tank 14, and the water in the first water storage tank 14 is heated in the second heat collecting device 12 after being pressurized by the first water pump 15 and is stored in the second water storage tank 13.
The sunlight is collected by the condenser 1 and then is divided into a part suitable for photovoltaic power generation and a part suitable for photo-thermal heat collection by the frequency divider 2 according to the wavelength. A compressor 5, a second water pump 8 and a first water pump 15 in the photovoltaic power generation module 3 power generation driving system work; light suitable for photo-thermal heat collection is absorbed at the first heat collecting device 11, the second heat collecting device 12 and the heat supplying module 16, respectively.
The heat supply module 16 is divided into different heat supply grades according to the temperature, and the temperature is sequentially from high to low, namely, first-level heat supply, second-level heat supply, third-level heat supply and fourth-level heat supply. The primary heat supply is directly collected by sunlight, and the heat supply temperature is 250-300 ℃; the secondary heat supply is supplied after the heat absorption of the first heat collecting device 11 through a heat exchange working medium, and the heat supply temperature is 150-250 ℃; the third-level heat supply is carried out through a second water storage tank 13, and the heat supply temperature is 80-150 ℃; the four-stage heat supply is realized by the first water storage tank 14, and the heat supply temperature is 30-80 ℃.
The water in the water tank 7 may supplement the water in the first and second water gas tanks 71 and 72.
The air is stored in the geothermal well 10 and left for at least 6 hours.
The photovoltaic module 3 adopts a flat single-shaft tracking system and adopts an N-type IBC double-sided half-sheet battery assembly; the first heat collecting device 11 and the second heat collecting device 12 adopt linear Fresnel type heat collecting devices.
The first water storage tank 14 and the second water storage tank 13 are both subjected to adiabatic treatment, and insoluble gas with certain pressure is preset in the second water storage tank 13.
Preferably, the sunlight suitable for photo-thermal heat collection can be selectively distributed to one or more of the first heat collecting device 11, the heat supplying module 16 and the second heat collecting device 12.
Preferably, the heat exchange working medium at the outlet of the first heat collecting device 11 arranged between the two heat exchangers can selectively supply heat to the heat supply module 16.
Preferably, the specific heating scheme may be implemented by matching between different heating levels.
Referring to fig. 2, a top view of the geothermal well 10 of the present invention is shown, wherein the geothermal well has a central casing and is a U-shaped well with a bottom connected.
As shown in fig. 3, which is a schematic view of the air flowing direction in the geothermal well 10 of the present invention, air enters from the outer pipe sleeve of the geothermal well and is discharged from the central pipe sleeve, so that the heat in the air is effectively used for recovering the geothermal heat, and the heat loss of the water discharged from the central pipe sleeve is reduced.
As shown in fig. 4, a schematic diagram of the inner and outer fins of the first and second water tanks 71 and 72 in the present invention is shown. The first water tank 71 and the second water tank 72 have the same regulation, and have both the inner and outer surfaces subjected to rust prevention treatment and provided with annular ribs. The inner and outer annular fins are arranged alternately and are not on the same horizontal plane, so that the heat exchange condition between the inside of the tank body and the outside is enhanced, and the high-efficiency work of the isothermal compression module is ensured.
As shown in fig. 5, a perspective view of the heat supply module is shown, the heat supply module includes a heat collecting tube 165, a fixed slot type condenser 166, a first-stage heat supply unit 161, a second-stage heat supply unit 162, a third-stage heat supply unit 163, and a fourth-stage heat supply unit 164, as an optional embodiment, the heat supply module 16 is arranged in an up-down structure, and the heat collecting tube 165, the fixed slot type condenser 166, the first-stage heat supply unit 161, the second-stage heat supply unit 162, the third-stage heat supply unit 163, and the fourth-stage heat supply unit 164 are sequentially arranged from top to bottom.
As shown in fig. 6, which is a left side view of the heating module. The heat supply module 16 comprises a primary heat supply unit 161, a secondary heat supply unit 162, a tertiary heat supply unit 163, a quaternary heat supply unit 164, a heat collecting pipe 165, a fixed groove type condenser 166, a heat exchange pipe 167, a heat insulating layer 168 and a heat storage medium; the heat collecting pipe 165 is communicated with the heat exchanging pipe in the first heat supplying unit 161 to transfer heat in the heat collecting medium to the heat accumulating medium in the first heat supplying unit 161. The heat exchange tube in the second heat supply unit 162 is communicated with the outlet of the first heat collecting device 11, so that the heat absorbed by the working medium in the first heat collecting device 11 can be transferred to the heat storage medium in the second heat supply unit 162. The heat exchanging pipe of the third heat supplying unit 163 is communicated with the second water storage tank 12, and can transfer the heat of the second water storage tank 12 to the heat accumulating medium of the third heat supplying unit 163. The heat exchange pipe of the fourth heat supply unit 164 is communicated with the first water storage tank 14, and can transfer the heat of the first water storage tank 14 to the heat storage medium of the fourth heat supply unit 164. Heat insulation layers are arranged between every two adjacent heat supply units, the heat supply module is integrally subjected to heat insulation treatment, and heat storage media in different heat supply units are made of different materials due to different working temperatures; specifically, as a preferred embodiment, the heat storage media in the primary heat supply unit 161, the secondary heat supply unit 162, the tertiary heat supply unit 163 and the quaternary heat supply unit 164 are specifically water for the heat storage media of the quaternary heat supply unit, a mixture of LiNO3-NaNO3-KNO3 for the heat storage media of the tertiary heat supply unit, molten salt of 50 wt% KNO 3-40% NaNO 2-7% NaNO3 for the heat storage media of the secondary heat supply unit, and molten salt of NaNO3-KNO3 for the heat storage media of the primary heat supply unit.
Claims (10)
1. A coupling power system with a geothermal recovery function is characterized by comprising a compressed air energy storage unit, a solar photovoltaic photo-thermal unit, a geothermal well (10) and a heat supply unit; the compressed air energy storage unit comprises a compressor set (5), a first heat exchanger (6), an isothermal compression module and a second heat exchanger (9) which are sequentially communicated, a heat fluid side of the second heat exchanger (9) is also communicated with a cold fluid side of the first heat exchanger (6), and a cold fluid outlet of the second heat exchanger (9) is communicated with an air inlet of a geothermal well (10); the solar photovoltaic photo-thermal unit comprises a condenser (1), a frequency divider (2), a photovoltaic module (3), a first heat collecting device (11) and a second heat collecting device (12), wherein the frequency divider (2) is arranged behind the condenser (1), the frequency divider (2) is respectively connected with the photovoltaic module (3), the first heat collecting device (11) and the second heat collecting device (12), and the first heat collecting device (11) is arranged on a pipeline for communicating the second heat exchanger (9) and the first heat exchanger (6); the heat supply unit comprises a first water storage tank (14), a second water storage tank (13) and a heat supply module (16), the heat supply module (16) is respectively connected with the first water storage tank (14), the second water storage tank (13), a heat exchange working medium outlet of a first heat collection device (11) and the frequency divider (2), an inlet of the first water storage tank (14) is connected with an outlet of the geothermal well (10), and a first water pump (15) is arranged between the first water storage tank (14) and the second water storage tank (13); the photovoltaic module (3) respectively supplies power to the first water pump (15) and the air compressor set (5).
2. The coupled power system with the geothermal recovery function according to claim 1, wherein the isothermal compression module comprises a first water gas tank (71) and a second water gas tank (72), a water tank (7) and a second water pump (8), wherein air inlets of the first water gas tank (71) and the second water gas tank (72) are connected in parallel to an exhaust pipeline of the compressor (5), air outlets of the first water gas tank (71) and the second water gas tank (72) are connected in parallel to an air inlet of the geothermal well (10), and the second water pump (8) is used for communicating the first water gas tank (71) and the second water gas tank (72) through pipelines so as to realize the water charging and discharging of the two tanks alternately; the first water tank (71) and the second water tank (72) are immersed in a water tank (7) filled with normal-temperature water, and the photovoltaic module (3) supplies power to the second water pump (8).
3. The coupled power system with geothermal recovery function according to claim 2, wherein the first water tank (71) and the second water tank (72) have antirust coatings on the inside and outside, and annular fins are arranged alternately inside and outside the tank bodies, and the inner and outer fins are at different horizontal positions; the first water gas tank (71) and the second water gas tank (72) are provided with water inlets communicated with the inner space of the water tank, valves are arranged at the water inlets, and water in the water tank (7) supplements water in the first water gas tank (71) and the second water gas tank (72).
4. The coupled power system with geothermal recovery function according to claim 1, wherein the geothermal well (10) is a U-shaped well with a central pipe sleeve bottom communication; the geothermal well (10) comprises an outer sleeve and an inner sleeve, air enters from the outer sleeve of the geothermal well (10), and water is discharged from the central sleeve; the air is stored in the geothermal well (10) for at least 6 hours.
5. The coupled power system with geothermal recovery function according to claim 1, wherein the heat supply module (16) comprises a primary heat supply unit (161), a secondary heat supply unit (162), a tertiary heat supply unit (163), a quaternary heat supply unit (164), a heat collecting pipe (165), a fixed groove type condenser (166) and a heat exchange pipe (167); the heat collecting pipe (165) is communicated with a heat exchanging pipe in the first heat supply unit (161); the heat exchange tube in the second heat supply unit (162) is communicated with the outlet of the first heat collecting device (11); the heat exchange pipe in the third heat supply unit (163) is communicated with the second water storage tank (12); a heat exchange pipe in the fourth heat supply unit (164) is communicated with the first water storage tank (14); a heat insulating layer (168) is arranged between every two adjacent heat supply units; the heat supply module is used for heat insulation treatment integrally, and a first-stage heat supply unit (161), a second-stage heat supply unit (162), a third-stage heat supply unit (163), a fourth-stage heat supply unit (164) and a heat collecting pipe (165) are filled with heat storage media and heat exchange media.
6. The coupled power system with geothermal recovery function according to claim 1, wherein the photovoltaic module (3) adopts a flat single-axis tracking system, adopts an N-type IBC double-sided half-sheet battery assembly; the first heat collecting device (11) and the second heat collecting device (12) adopt linear Fresnel type heat collecting devices.
7. The coupled power system with geothermal recovery function according to claim 1, wherein the compressor unit (5) employs a twin-screw compressor; the first heat exchanger (6) and the second heat exchanger (9) adopt a shell-and-tube heat exchanger countercurrent arrangement mode, the first water storage tank (14) and the second water storage tank (13) are subjected to adiabatic treatment, and water-insoluble gas with a set volume is preset in the second water storage tank (13).
8. The method for operating a coupled power system with a geothermal recovery function according to any one of claims 1 to 7 is characterized by comprising the following steps:
air enters a first heat exchanger (6) after being compressed by a compressor set (5); the air enters the isothermal compression module after being subjected to heat release in the first heat exchanger (6), enters the second heat exchanger (9) to absorb heat after being subjected to pressure boost in the isothermal compression module, and enters the geothermal well (10) to store energy after absorbing heat; meanwhile, the heat exchange working medium absorbs compression heat in the first heat exchanger (6), then absorbs heat in the first heat collecting device (11), heats compressed air in the second heat exchanger (9), and the heat-released heat exchange working medium enters the first heat exchanger (6) to absorb the compression heat; water in the geothermal well (10) is discharged through the central pipe sleeve and enters the first water storage tank (14), and the water in the first water storage tank (14) absorbs heat in the second heat collection device (12) after being pressurized by the first water pump (15) and is stored in the second water storage tank (13);
after being concentrated by the condenser (1), the sunlight is divided into a part suitable for photovoltaic power generation and a part suitable for photo-thermal heat collection by the frequency divider (2) according to the wavelength; the photovoltaic power generation module (3) provides electric energy for the compressor unit (5) and the first water pump (15); the first heat collecting device (11), the second heat collecting device (12) and the heat supply module (16) absorb light suitable for photo-thermal heat collection.
9. The operating method according to claim 8, characterized in that the heat supply module (16) is divided into different heat supply grades according to the temperature, and the temperature is sequentially from high to low, namely, primary heat supply, secondary heat supply, tertiary heat supply and quaternary heat supply, wherein the primary heat supply directly collects heat through sunlight, and the heat supply temperature is 250-300 ℃; secondary heat supply is supplied after heat absorption is carried out on the first heat collecting device (11) through a heat exchange working medium, and the heat supply temperature is 150-250 ℃; the third-level heat supply is realized through a second water storage tank (13), and the heat supply temperature is 80-150 ℃; the four-stage heat supply is realized by the first water storage tank (14), and the heat supply temperature is 30-80 ℃.
10. The operating method according to claim 8, characterized in that the heat exchange medium at the outlet of the first heat collecting device (11) arranged between the two heat exchangers selectively supplies heat to the heat supply module (16); the sunlight suitable for photo-thermal heat collection is selectively distributed to one or more of the first heat collection device (11), the heat supply module (16) and the second heat collection device (12).
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