CN112031885B - Photovoltaic power generation and rock energy storage integrated system and method - Google Patents
Photovoltaic power generation and rock energy storage integrated system and method Download PDFInfo
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- CN112031885B CN112031885B CN202010898781.6A CN202010898781A CN112031885B CN 112031885 B CN112031885 B CN 112031885B CN 202010898781 A CN202010898781 A CN 202010898781A CN 112031885 B CN112031885 B CN 112031885B
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- 238000010248 power generation Methods 0.000 title claims abstract description 50
- 239000011435 rock Substances 0.000 title claims abstract description 40
- 238000004146 energy storage Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000005611 electricity Effects 0.000 claims description 14
- 230000010354 integration Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/06—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using mixtures of different fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0056—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using solid heat storage material
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02S10/10—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power including a supplementary source of electric power, e.g. hybrid diesel-PV energy systems
-
- 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
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Power Engineering (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a photovoltaic power generation and rock energy storage integrated system and a method, which comprises a photovoltaic power generation plate, a non-azeotropic mixed working medium Rankine cycle power generation system and a rock energy storage system, wherein the rock energy storage system comprises rocks, a low-temperature heat exchanger and a high-temperature heat exchanger which are positioned in the rocks, the non-azeotropic mixed working medium Rankine cycle power generation system comprises a compressor and an expander, an outlet of the compressor is communicated with an inlet of the expander and one end of the low-temperature heat exchanger, the other end of the low-temperature heat exchanger is communicated with one end of the high-temperature heat exchanger, and the other end of the high-temperature heat exchanger is communicated with an outlet of the compressor and an inlet of the expander; the photovoltaic power generation board is connected with the motor, the generator and the power grid, the output shaft of the motor is connected with the driving shaft of the compressor, and the driving shaft of the generator is connected with the expander.
Description
Technical Field
The invention belongs to the technical field of solar energy utilization, energy storage and energy conservation, and relates to a photovoltaic power generation and rock energy storage integrated system and method.
Background
The western region of China is rich in solar energy resources, but large hydropower stations are difficult to build due to the fact that the western region is lack of water, and therefore electric energy is difficult to store in a large scale. Meanwhile, due to the shortage of underground water resources in western regions, the heat of the boulders in the soil is difficult to be taken away by the underground water, so that the boulders become natural energy storage media, and a large amount of investment for building energy storage containers can be saved (compared with a dam of a pumped storage power station and a compressed air energy storage tank). For the utilization of a medium-low temperature heat source, the non-azeotropic working medium can ensure that the heat exchange temperature difference between a heat source/cold source and the working medium is less than 5 ℃, and can effectively generate power when the temperature difference between the heat source and the cold source exceeds 40 ℃, so that the system achieves higher heat efficiency, and then the prior art does not have a technology for combining photovoltaic power generation and rock energy storage.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a photovoltaic power generation and rock energy storage integrated system and method, which can realize the integration of photovoltaic power generation and rock energy storage.
In order to achieve the purpose, the photovoltaic power generation and rock energy storage integrated system comprises a photovoltaic power generation plate, a non-azeotropic mixed working medium Rankine cycle power generation system and a rock energy storage system, wherein the rock energy storage system comprises rocks, a low-temperature heat exchanger and a high-temperature heat exchanger which are positioned in the rocks, the non-azeotropic mixed working medium Rankine cycle power generation system comprises a compressor and an expander, an outlet of the compressor is communicated with an inlet of the expander and one end of the low-temperature heat exchanger, the other end of the low-temperature heat exchanger is communicated with one end of the high-temperature heat exchanger, and the other end of the high-temperature heat exchanger is communicated with an outlet of the compressor and an inlet of the expander.
The photovoltaic power generation board is connected with the motor, the generator and the power grid, the output shaft of the motor is connected with the driving shaft of the compressor, and the driving shaft of the generator is connected with the expander.
The photovoltaic power generation panel is connected with one end of the third circuit breaker, a power grid is connected with one end of the fourth circuit breaker, one end of the first circuit breaker is connected with a power generator, one end of the second circuit breaker is connected with a motor, and the other end of the first circuit breaker is connected with the other end of the second circuit breaker, the other end of the third circuit breaker and the other end of the fourth circuit breaker.
The high-temperature heat exchanger is connected with one end of the first branch and one end of the second branch, the other end of the first branch and the other end of the second branch are connected with the low-temperature heat exchanger, a first valve and an expansion valve are arranged on the first branch, and a second valve and a mixed working medium pump are arranged on the second branch.
A third valve is arranged between the high-temperature heat exchanger and the expander.
A fourth valve is arranged between the high-temperature heat exchanger and the compressor.
The distance between the high-temperature heat exchanger and the ground surface is smaller than the distance between the low-temperature heat exchanger and the ground surface.
A photovoltaic power generation and rock energy storage integration method comprises the following steps:
at the strong and power consumption valley stage of sunshine, when the electric energy that photovoltaic power generation board produced was surplus, then closed third circuit breaker and second circuit breaker, break off first circuit breaker, the motor operation, the compressor operation, open fourth valve and first valve, close second valve and third valve, the surplus electric energy after the electric energy that photovoltaic power generation board produced supplied with the electric wire netting at this moment supplies with the motor, the motor drives the compressor compression mixed working medium, the mixed working medium after the compression gets into in the high temperature heat exchanger and passes the heat to the first half of rock, get into low temperature heat exchanger through the expansion valve again, pass cold volume to the latter half of rock, then get into in the compressor.
At sunshine not enough and power consumption peak stage, when the electricity that photovoltaic power generation board produced can not satisfy the electric wire netting demand this moment, then disconnection third circuit breaker and second circuit breaker, closed first circuit breaker, the generator operation, the expander operation, close fourth valve and first valve, open second valve and third valve, the operation of mixed working medium pump, mixed working medium enters into high temperature heat exchanger after the mixed working medium pump steps up the heat absorption and intensifies, then enter into the expander in the acting, the expander drives the generator electricity generation, the electric wire netting is all sent into to the electric energy that the generator produced, the exhaust steam of expander gets into low temperature heat exchanger and condenses, then enter into mixed working medium pump.
The invention has the following beneficial effects:
during specific operation, in the stage of strong sunshine and low electricity consumption, the electric energy generated by the photovoltaic power generation panel is surplus, the surplus electric energy is utilized to drive the motor to work, the motor drives the compressor to compress the mixed working medium, then the mixed working medium is sent into the high-temperature heat exchanger to transfer heat to the upper half part of the rock, and when the electricity generated by the photovoltaic power generation panel cannot meet the requirement of the power grid in the stage of insufficient sunshine and high electricity consumption, the high-temperature heat exchanger is utilized to absorb the heat of the upper half part of the rock to generate electricity so as to supplement the power grid, so that the integration of the photovoltaic power generation and the rock energy storage is realized.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
The system comprises a photovoltaic power generation board 1, a motor 2, a compressor 3, a fourth valve 4, a high-temperature heat exchanger 5, a first valve 6, an expansion valve 7, a low-temperature heat exchanger 8, a mixed working medium pump 9, a second valve 10, a third valve 11, an expansion machine 12, a power generator 13, a first circuit breaker 14, a second circuit breaker 15, a third circuit breaker 16 and a fourth circuit breaker 17, wherein the first circuit breaker is a photovoltaic power generation board, the second circuit breaker is a motor, the fourth circuit breaker is a compressor 3, the fourth valve is a high-temperature heat exchanger 5, the expansion machine 12 is a mixed working medium pump, the second circuit breaker is a second valve, the fourth circuit breaker is a fourth circuit breaker 17, and the mixed working medium pump is a mixed working medium pump 10.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the integrated photovoltaic power generation and rock energy storage system comprises a photovoltaic power generation panel 1, a non-azeotropic mixed working medium rankine cycle power generation system and a rock energy storage system, wherein the rock energy storage system comprises rock, a low-temperature heat exchanger 8 and a high-temperature heat exchanger 5 which are positioned in the rock, the non-azeotropic mixed working medium rankine cycle power generation system comprises a compressor 3 and an expander 12, an outlet of the compressor 3 is communicated with an inlet of the expander 12 and one end of the low-temperature heat exchanger 8, the other end of the low-temperature heat exchanger 8 is communicated with one end of the high-temperature heat exchanger 5, and the other end of the high-temperature heat exchanger 5 is communicated with an outlet of the compressor 3 and an inlet of the expander 12; the photovoltaic power generation panel 1 is connected with a motor 2, a generator 13 and a power grid, an output shaft of the motor 2 is connected with a driving shaft of the compressor 3, and a driving shaft of the generator 13 is connected with the expander 12.
The photovoltaic power generation system further comprises a first circuit breaker 14, a second circuit breaker 15, a third circuit breaker 16 and a fourth circuit breaker 17, wherein the photovoltaic power generation panel 1 is connected with one end of the third circuit breaker 16, a power grid is connected with one end of the fourth circuit breaker 17, one end of the first circuit breaker 14 is connected with the power generator 13, one end of the second circuit breaker 15 is connected with the motor 2, and the other end of the first circuit breaker 14 is connected with the other end of the second circuit breaker 15, the other end of the third circuit breaker 16 and the other end of the fourth circuit breaker 17.
The invention also comprises a first branch and a second branch, wherein the high-temperature heat exchanger 5 is connected with one end of the first branch and one end of the second branch, the other end of the first branch and the other end of the second branch are connected with the low-temperature heat exchanger 8, the first branch is provided with a first valve 6 and an expansion valve 7, and the second branch is provided with a second valve 10 and a mixed working medium pump 9; a third valve 11 is arranged between the high-temperature heat exchanger 5 and the expander 12; a fourth valve 4 is arranged between the high-temperature heat exchanger 5 and the compressor 3.
The distance between the high temperature heat exchanger 5 and the ground surface is smaller than the distance between the low temperature heat exchanger 8 and the ground surface.
The photovoltaic power generation and rock energy storage integration method comprises the following steps:
at the stage of strong sunshine and low electricity consumption, namely when the electric energy generated by the photovoltaic power generation panel 1 is surplus, the third circuit breaker 16 and the second circuit breaker 15 are closed, the first circuit breaker 14 is disconnected, the motor 2 operates, the compressor 3 operates, the fourth valve 4 and the first valve 6 are opened, the second valve 10 and the third valve 11 are closed, the surplus electric energy generated by the photovoltaic power generation panel 1 at the moment is supplied to the motor 2 after being supplied to the power grid, the motor 2 drives the compressor 3 to compress the mixed working medium, the compressed mixed working medium enters the high-temperature heat exchanger 5 to transfer heat to the upper half part of the rock, then enters the low-temperature heat exchanger 8 through the expansion valve 7 to transfer cold to the lower half part of the rock, and then enters the compressor 3;
at the stage of insufficient sunshine and peak of electricity utilization, at the moment, when the electricity generated by the photovoltaic power generation panel 1 cannot meet the requirement of a power grid, the third circuit breaker 16 and the second circuit breaker 15 are disconnected, the first circuit breaker 14 is closed, the generator 13 runs, the expander 12 runs, the fourth valve 4 and the first valve 6 are closed, the second valve 10 and the third valve 11 are opened, the mixed working medium pump 9 runs, the mixed working medium is boosted by the mixed working medium pump 9 and then enters the high-temperature heat exchanger 5 to absorb heat and raise temperature, then enters the expander 12 to do work, the expander 12 drives the generator 13 to generate electricity, all the electric energy generated by the generator 13 is sent into the power grid, the exhaust steam discharged by the expander 12 enters the low-temperature heat exchanger 8 to be condensed, and then enters the mixed working medium pump 9.
When the solar radiation amount fluctuates for a short time due to weather changes (such as cloud shielding), the fifth circuit breaker is timely opened or closed, so that short-time electric energy changes are supplemented, and the input electric power of the compressor 3 is kept unchanged before and after the weather changes.
The object of the present invention is fully effectively achieved by the above embodiments. Those skilled in the art will appreciate that the present invention includes, but is not limited to, what is described in the accompanying drawings and the foregoing detailed description. While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications within the spirit and scope of the appended claims.
Claims (2)
1. A method for integrating photovoltaic power generation and rock energy storage is characterized in that based on the claimed system for integrating photovoltaic power generation and rock energy storage, the photovoltaic power generation and rock energy storage integrated system comprises a photovoltaic power generation plate (1), a non-azeotropic mixed working medium Rankine cycle power generation system and a rock energy storage system, the rock energy storage system comprises rock, a low-temperature heat exchanger (8) and a high-temperature heat exchanger (5) which are positioned in the rock, the non-azeotropic mixed working medium Rankine cycle power generation system comprises a compressor (3) and an expander (12), wherein, the outlet of the compressor (3) is communicated with the inlet of the expander (12) and one end of the low-temperature heat exchanger (8), the other end of the low-temperature heat exchanger (8) is communicated with one end of the high-temperature heat exchanger (5), and the other end of the high-temperature heat exchanger (5) is communicated with the outlet of the compressor (3) and the inlet of the expander (12);
the photovoltaic power generation panel (1) is connected with a motor (2), a generator (13) and a power grid, an output shaft of the motor (2) is connected with a driving shaft of a compressor (3), and a driving shaft of the generator (13) is connected with an expander (12);
the photovoltaic power generation system is characterized by further comprising a first circuit breaker (14), a second circuit breaker (15), a third circuit breaker (16) and a fourth circuit breaker (17), wherein the photovoltaic power generation panel (1) is connected with one end of the third circuit breaker (16), a power grid is connected with one end of the fourth circuit breaker (17), one end of the first circuit breaker (14) is connected with the power generator (13), one end of the second circuit breaker (15) is connected with the motor (2), and the other end of the first circuit breaker (14) is connected with the other end of the second circuit breaker (15), the other end of the third circuit breaker (16) and the other end of the fourth circuit breaker (17);
the system also comprises a first branch and a second branch, wherein the high-temperature heat exchanger (5) is connected with one end of the first branch and one end of the second branch, the other end of the first branch and the other end of the second branch are connected with the low-temperature heat exchanger (8), the first branch is provided with a first valve (6) and an expansion valve (7), and the second branch is provided with a second valve (10) and a mixed working medium pump (9);
a third valve (11) is arranged between the high-temperature heat exchanger (5) and the expander (12);
a fourth valve (4) is arranged between the high-temperature heat exchanger (5) and the compressor (3);
the method comprises the following steps:
at the stage of strong sunshine and low electricity consumption, namely when the electric energy generated by the photovoltaic power generation panel (1) is left, closing a third circuit breaker (16) and a second circuit breaker (15), disconnecting a first circuit breaker (14), operating the motor (2), operating the compressor (3), opening a fourth valve (4) and a first valve (6), closing a second valve (10) and a third valve (11), supplying the left electric energy generated by the photovoltaic power generation panel (1) to the power grid to the motor (2), driving the compressor (3) to compress a mixed working medium by the motor (2), enabling the compressed mixed working medium to enter a high-temperature heat exchanger (5) to transfer heat to the upper half part of the rock, then enter a low-temperature heat exchanger (8) through an expansion valve (7), transferring cold to the lower half part of the rock, and then enter the compressor (3);
when the sunlight is insufficient and the electricity consumption peak period is reached, and the electricity generated by the photovoltaic power generation panel (1) can not meet the requirement of a power grid, then the third circuit breaker (16) and the second circuit breaker (15) are disconnected, the first circuit breaker (14) is closed, the generator (13) operates, the expander (12) operates, the fourth valve (4) and the first valve (6) are closed, the second valve (10) and the third valve (11) are opened, the mixed working medium pump (9) operates, the mixed working medium enters the high-temperature heat exchanger (5) to absorb heat and raise temperature after being boosted by the mixed working medium pump (9), then the steam enters an expansion machine (12) to do work, the expansion machine (12) drives a generator (13) to generate electricity, all the electric energy generated by the generator (13) is sent to a power grid, and the exhaust steam discharged by the expansion machine (12) enters a low-temperature heat exchanger (8) to be condensed and then enters a mixed working medium pump (9).
2. The integrated photovoltaic power generation and rock energy storage method according to claim 1, characterized in that the distance between the high temperature heat exchanger (5) and the earth's surface is smaller than the distance between the low temperature heat exchanger (8) and the earth's surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010898781.6A CN112031885B (en) | 2020-08-31 | 2020-08-31 | Photovoltaic power generation and rock energy storage integrated system and method |
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| CN202010898781.6A CN112031885B (en) | 2020-08-31 | 2020-08-31 | Photovoltaic power generation and rock energy storage integrated system and method |
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| CN112031885B true CN112031885B (en) | 2022-08-02 |
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| CN112031885A (en) | 2020-12-04 |
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