CN114128538A - Wind-light-geothermal integrated power generation and greenhouse heat energy supply system and method - Google Patents
Wind-light-geothermal integrated power generation and greenhouse heat energy supply system and method Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 364
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 182
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 182
- 238000005338 heat storage Methods 0.000 claims abstract description 56
- 238000007906 compression Methods 0.000 claims abstract description 31
- 230000008569 process Effects 0.000 claims abstract description 8
- 230000006835 compression Effects 0.000 claims description 27
- 238000004146 energy storage Methods 0.000 claims description 19
- 230000033228 biological regulation Effects 0.000 claims description 18
- 238000005485 electric heating Methods 0.000 claims description 15
- 239000011435 rock Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
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- 239000007789 gas Substances 0.000 claims description 8
- 239000002918 waste heat Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 5
- 238000005265 energy consumption Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 229910001338 liquidmetal Inorganic materials 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
- A01G9/243—Collecting solar energy
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
- A01G9/245—Conduits for heating by means of liquids, e.g. used as frame members or for soil heating
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
- A01G9/26—Electric devices
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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
- H02J15/00—Systems for storing electric energy
- H02J15/006—Systems for storing electric energy in the form of pneumatic energy, e.g. compressed air energy storage [CAES]
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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
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a wind-light-geothermal integrated power generation and greenhouse heat energy supply system and a method, comprising an open carbon dioxide Brayton cycle power generation system, wherein the open carbon dioxide Brayton cycle power generation system is connected with a geothermal storage system and a carbon dioxide storage tank; the open carbon dioxide Brayton cycle power generation system is connected with the double-tank heat storage system; the double-tank heat storage system is connected with the solar photo-thermal system and the greenhouse heat energy supply system; photovoltaic systems and wind power systems are also included. The power station utilizes the space of a natural geothermal reservoir and an additionally arranged carbon dioxide storage tank to decouple the heat power circulation of the traditional carbon dioxide, so that the compression process and the expansion process are mutually independent, and the adjustment flexibility of the geothermal power station is greatly improved.
Description
Technical Field
The invention relates to the field of vibration suppression and power generation, in particular to a wind-light-geothermal integrated power generation and greenhouse heat energy supply system and method.
Background
With the high proportion of new energy, the traditional electrical system supported by large thermal power and large hydroelectric power is difficult to maintain the existing stability. Therefore, the important problem of energy field attention at the present stage is to deal with the consumption of a large proportion of clean energy and ensure the supply safety in the energy revolution process. The large-scale energy storage technology can effectively improve the stability of wind and light power station supply and promote clean energy consumption, and has become an industry consensus. However, no energy storage form exists at present, which can perfectly meet the requirements of energy storage scale, charging and discharging speed, economy and the like. How to realize power grid friendliness on the power supply side needs to utilize a comprehensive energy idea to flexibly apply a composite energy storage technology in the short term and make local conditions by utilizing the complementarity of the power supply.
The geothermal energy is a clean, renewable and power grid-friendly energy form, and has the characteristic of strong compatibility, so that the development and utilization of the geothermal energy are not only a single geothermal power generation project. High-quality geothermal energy resources exist in partial regions of China, and with the stable improvement of the national demand for renewable power, the development of geothermal power generation in China is expected to be vigorous. At present, the most mature and economic geothermal development and utilization is a medium-temperature hydrothermal geothermal system, and the development of geothermal resources is mainly carried out by direct or indirect power generation through flash evaporation cycle and organic Rankine cycle. The flash evaporation cycle power generation mainly utilizes water as a cycle working medium, but the efficiency of steam circulation at a medium-low temperature section is not high; the organic Rankine cycle power generation mainly uses water as an intermediate heat-carrying medium to transfer heat to an organic working medium for expansion work, and the technical route has the problems of exergy loss caused by multi-stage heat exchange, serious heat exchanger fouling resistance and the like. Furthermore, hot dry rock is typically stored deep underground, with relatively low development difficulty and economy and relatively late development. In the development of dry hot rock type geothermal energy, a thermal reservoir is usually subjected to fracturing modification, water is adopted for heat extraction, and a series of problems of high water consumption, high-temperature water reaction and the like exist. CN 106091452 a discloses a geothermal photovoltaic complementary power station, but the technical route belongs to a complementary form of a conventional stable power source and a new energy power station, and does not utilize the compatibility of a thermal power system and the energy storage characteristic of a compressible power system, so that the potential of the geothermal power station cannot be fully exerted.
The carbon dioxide direct-expansion geothermal power generation system is a leading-edge technical means for the utilization of geothermal power generation at the present stage, the technical route adopts carbon dioxide as a heat extraction medium, a heat carrying medium and a circulating medium, so that intermediate links are reduced, the carbon dioxide in a supercritical state has strong liquidity, and the circulation loss is reduced. In addition, the carbon dioxide can react with the reservoir boundary and carry out self-sealing, and the self-adaption of carbon dioxide storage and utilization is realized. However, the current related utilization modes are few, and the carbon dioxide utilization mode of the patent CN 204532450U still uses the carbon dioxide as an intermediate heat exchange medium. Patent CN 109185083 a and patent 109083706 a respectively describe two supercritical carbon dioxide power generation systems based on dry hot rock, but the above systems are mainly simple to use, and cannot maximize the comprehensive power generation benefit of geothermal energy resources.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a wind-light-geothermal integrated power generation and greenhouse heat energy supply system and method. In addition, the power station optimally configures new energy such as wind power, photovoltaic and the like with geothermal power generation and photothermal power generation, organically integrates the whole system by utilizing the comprehensive energy concept, fully exerts the compatibility of geothermal resources and greatly improves the power grid friendliness of clean energy.
In order to solve the technical problems, the invention provides the following technical scheme: the wind-light-geothermal integrated power generation and greenhouse heat energy supply system comprises an open carbon dioxide Brayton cycle power generation system, wherein the open carbon dioxide Brayton cycle power generation system is connected with a geothermal storage system and a carbon dioxide storage tank; the open carbon dioxide Brayton cycle power generation system is connected with the double-tank heat storage system; the double-tank heat storage system is connected with the solar photo-thermal system and the greenhouse heat energy supply system; photovoltaic systems and wind power systems are also included.
The motor connected with the compression system of the open carbon dioxide Brayton cycle power generation system receives waste electricity from the photovoltaic system and the wind power system, and compresses carbon dioxide stored in the carbon dioxide storage tank to the geothermal storage system; the medium-high pressure supercritical carbon dioxide from the geothermal storage system is subjected to temperature re-elevation through the double-tank heat storage system, and the stored pressure energy is converted into electric energy through the expansion system and the matched motor of the open carbon dioxide Brayton cycle power generation system.
The heat stored in the double-tank heat storage system supplies heat to the greenhouse through the greenhouse heat energy supply system.
The carbon dioxide storage depth in the geothermal storage system is 10000m at 1000-.
The types of the heat storage layers of the geothermal storage system are divided into a hydrothermal heat storage layer and a dry-heat rock heat storage layer; the hydrothermal heat reservoir utilizes a water conservancy system consisting of an underground reservoir space and related fractures as a corresponding gas storage space; the dry hot rock type heat reservoir utilizes a dry hot rock fracturing gap or a plume type geothermal system as a corresponding gas storage space.
The storage pressure of the carbon dioxide storage tank is the lowest operation pressure of the carbon dioxide Brayton cycle power generation system, and the operation pressure of the carbon dioxide storage tank is ensured to be more than 10 MPa.
The solar photo-thermal system adopts tower photo-thermal heat collection or groove photo-thermal heat collection as required; the corresponding double-tank heat storage system selects liquid metal, fused salt or heat conducting oil according to the system operation temperature section, and two heat storage tanks in the double-tank heat storage system respectively store high-temperature and low-temperature media which are mutually standby; the double-tank heat storage system is configured with electric heating to realize primary frequency modulation of the power output of the photovoltaic system and the wind power system; the photovoltaic system and the wind power system are equipped according to the load characteristics and the maximum output level of the geothermal power station, and a power generation mode with photovoltaic wind power output mainly in daytime and wind power and geothermal power mainly at night is formed.
The operation method of the wind-light-geothermal integrated power generation and greenhouse heat energy supply system comprises the following steps:
the system realizes the regulation of system energy storage and power generation through carbon dioxide circulation: an outlet of a carbon dioxide compression system of the open carbon dioxide Brayton cycle power generation system is connected with an inlet of a geothermal storage system, an outlet of the geothermal storage system is connected with an inlet of a carbon dioxide expansion system of the open carbon dioxide Brayton cycle power generation system, an outlet of the carbon dioxide expansion system of the open carbon dioxide Brayton cycle power generation system is connected with an inlet of a carbon dioxide storage tank, and an outlet of the carbon dioxide storage tank is connected with an inlet of the carbon dioxide compression system of the open carbon dioxide Brayton cycle power generation system to complete carbon dioxide circulation;
the system access power supply comprises a photovoltaic system, a wind power system and a carbon dioxide expansion system belonging to an open carbon dioxide Brayton cycle power generation system; the system is connected with a compression system loaded with a carbon dioxide Brayton cycle power generation system and a double-tank heat storage system with electric heating, so that surplus electric energy can be stored and consumed;
the system is provided with a set of auxiliary heat source system, the core of the auxiliary heat source system is a double-tank heat storage system, and heat energy stored in the double-tank heat storage system is derived from a solar photo-thermal system, a carbon dioxide compression system to which an open carbon dioxide Brayton cycle power generation system belongs is used for compressing heat for recovery and electric energy which cannot be sent out by a power station; in winter, the heat stored in the double-tank heat storage system is used as a heat source to heat the greenhouse through the greenhouse heat energy supply system in addition to heating carbon dioxide.
According to actual power demand, the system can adjust the operation mode and realize different functions:
operation mode one, daytime peak regulation:
when the output of a power station is maximized or the load in an area reaches a peak value in a daytime power grid, the carbon dioxide is circularly and flexibly scheduled to run, at the moment, a carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system belongs is started, and the carbon dioxide in the geothermal storage system absorbs the heat in the double-tank heat storage system to raise the temperature so as to push the expansion system to generate power; at the moment, the photovoltaic system and the wind power system output power at the same time; in the stage, the peak regulation requirement of the power system is realized by adjusting the starting and frequency conversion of a carbon dioxide compression system to which the open carbon dioxide Brayton cycle power generation system belongs and the variable working condition output of a carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system belongs; when necessary, the electric heating in the double-tank heat storage system is started to realize the consumption of frequency type unstable electric power;
operation mode two, night peak regulation:
at night, photovoltaic output is stopped, the power grid requirement and the load in the area are in a low state, carbon dioxide circulation is matched with a wind power system to flexibly schedule and operate, at the moment, a carbon dioxide expansion system of an open carbon dioxide Brayton cycle power generation system is started, and carbon dioxide in a geothermal storage system absorbs heat in a double-tank heat storage system to raise the temperature so as to push the expansion system to generate power; in the stage, the peak regulation requirement of the power system is realized by adjusting the starting and frequency conversion of a carbon dioxide compression system to which the open carbon dioxide Brayton cycle power generation system belongs and the variable working condition output of a carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system belongs; when necessary, the electric heating in the double-tank heat storage system is started to realize the consumption of frequency type unstable electric power;
operation mode three, renewable energy consumption:
when the output of the photovoltaic system and the wind power system in the daytime has higher stability margin with the power grid requirement or regional load, the carbon dioxide circulation takes the energy storage as a main target, at the moment, the carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system belongs is closed, at the moment, the output of the photovoltaic system and the wind power system is dominant, and the surplus part realizes the peak regulation requirement of the power system through the opening and frequency conversion of the carbon dioxide compression system to which the open carbon dioxide Brayton cycle power generation system belongs; and when necessary, the electric heating in the double-tank heat storage system is started to realize the consumption of the frequency type unstable electric power.
A large amount of waste heat can be discharged in the power generation process of the system, when a heat load is arranged near the deployment position of the system, the waste heat of the system participates in heating through transmission and distribution, and the radiation radius is less than 60 kilometers; when no heat load exists near the deployment position of the system, an unattended and soilless-planted factory is constructed for heat consumption.
The invention has the following beneficial effects:
1. because medium-high temperature geothermal resources are precious, if a single geothermal power generation mode is adopted, higher economic benefits can be generated, but with the proposal of carbon neutralization and carbon peak reaching targets, the simple power generation utilization of geothermal energy is difficult to realize qualitative breakthrough on installed capacity. According to the invention, through fully utilizing the thermal inertia and energy storage potential of geothermal resources, a certain geothermal power generation duration is compressed through the cooperation with wind power photovoltaic resources, but the maximization of the installed capacity of the wind-light-geothermal-energy-storage integrated power station for geothermal energy storage and the maximization of comprehensive economic and social benefits are greatly realized.
2. Different from the traditional geothermal power generation system, the power generation system decouples the traditional carbon dioxide thermodynamic cycle by utilizing the space of a natural geothermal reservoir and an additionally arranged carbon dioxide storage tank, so that the compression process and the expansion process are mutually independent, and the adjustment flexibility of a geothermal power station is greatly improved.
3. This power generation system utilizes geothermal system as basic heat source, regards the compression heat of light and heat, electrical heating and recovery as the supplementary heat source to further promote the electricity generation parameter, realize the very big promotion of system cycle efficiency. The system not only provides an energy supply mode for carbon emission reduction, but also provides an effective way for carbon utilization and carbon sequestration.
4. The system firstly expands the function of a heat reservoir of a traditional power station from a single heat source function into two functions of compressed gas energy storage and heating, greatly utilizes the thermal inertia and energy storage potential of geothermal resources, is jointly developed with wind power and photovoltaic, and expands the system installation of clean renewable energy sources to the greatest extent while realizing the friendliness of a power grid.
5. The system utilizes the compression gas storage capacity of the natural geothermal storage system and is additionally provided with the carbon dioxide storage tank, the traditional geothermal continuous cycle power generation system is decoupled, the independent operation of the compression process and the expansion process is realized, and the geothermal power station is additionally provided with energy storage and supply on the basis of the traditional continuous power generation function.
6. This system further promotes the working medium parameter through light and heat, electrical heating and recovery compression heat on traditional geothermal power station uses geothermal reservoir as single heat source basis, very big improvement geothermal power station's cycle power generation efficiency.
7. The system provides three operation modes aiming at a wind-light-geothermal integrated power station based on compressed carbon dioxide energy storage, and when a power grid in the daytime requires the maximum output of the power station or a regional load side demand peak, the carbon dioxide circulation is matched with wind power photovoltaic to flexibly schedule and operate. When the output of the photovoltaic system and the wind power system in the daytime and the power grid demand or regional load have higher stability margin, the carbon dioxide circulation takes energy storage as a main target. Photovoltaic output is stopped at night, the power grid requirement and the regional load side requirement are in the lowest state, and the carbon dioxide is circularly matched with the wind power system to flexibly schedule and operate.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a block diagram of the system of the present invention.
FIG. 2 is a logic diagram of the operation of the system of the present invention.
In the figure: 1. open carbon dioxide brayton cycle power generation system, 2, geothermal storage system, 3, carbon dioxide storage tank, 4, solar photo-thermal system, 5, two jar heat-retaining systems, 6, photovoltaic system, 7, wind-powered electricity generation system, 8, warmhouse booth heat energy supply system.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1, the wind-light-geothermal integrated power generation and greenhouse heat energy supply system comprises an open carbon dioxide brayton cycle power generation system 1, wherein the open carbon dioxide brayton cycle power generation system 1 is connected with a geothermal storage system 2 and a carbon dioxide storage tank 3; the open carbon dioxide Brayton cycle power generation system 1 is connected with the double-tank heat storage system 5; the double-tank heat storage system 5 is connected with the solar photo-thermal system 4 and the greenhouse heat energy supply system 8; also included are photovoltaic systems 6 and wind power systems 7. By adopting the system, the space of a natural geothermal reservoir and an additionally arranged carbon dioxide storage tank can be utilized, the traditional carbon dioxide thermodynamic cycle is decoupled, the compression process and the expansion process can be mutually independent, and the adjustment flexibility of a geothermal power station is greatly improved; in addition, new energy sources such as wind power and photovoltaic are optimally configured with geothermal power generation and photothermal power generation, and the whole system is organically integrated by utilizing the comprehensive energy concept, so that the compatibility of geothermal resources is fully exerted, and the power grid friendliness of clean energy is greatly improved.
Further, the motor connected with the compression system of the open carbon dioxide Brayton cycle power generation system 1 receives the abandoned electricity from the photovoltaic system 6 and the wind power system 7, and compresses the carbon dioxide stored in the carbon dioxide storage tank 3 to the geothermal storage system 2; the medium-high pressure supercritical carbon dioxide from the geothermal storage system 2 is subjected to temperature re-elevation through the double-tank heat storage system 5, and the stored pressure energy is converted into electric energy through the expansion system and the matched motor of the open carbon dioxide Brayton cycle power generation system 1. Through the matching use of the two functions of the open type carbon dioxide Brayton cycle power generation system 1, secondary frequency modulation can be realized on the power output of the photovoltaic system 6 and the wind power system 7.
Further, the heat stored in the double-tank heat storage system 5 is used for heating the greenhouse through a greenhouse heat energy supply system 8. The effect of heat energy reutilization is achieved.
Further, the carbon dioxide storage depth in the geothermal storage system 2 is 10000m at 1000-.
Further, the types of the heat reservoirs of the geothermal storage system 2 are divided into a hydrothermal heat reservoir and a dry-heat rock heat reservoir; the hydrothermal heat reservoir utilizes a water conservancy system consisting of an underground reservoir space and related fractures as a corresponding gas storage space; the dry hot rock type heat reservoir utilizes a dry hot rock fracturing gap or a plume type geothermal system as a corresponding gas storage space.
Further, the storage pressure of the carbon dioxide storage tank 3 is the lowest operation pressure of the carbon dioxide brayton cycle power generation system 1, and considering that water vapor may be mixed when carbon dioxide flows through the geothermal storage system 2, the operation pressure of the carbon dioxide storage tank 3 is ensured to be greater than 10 MPa. The operating pressure of the system can be appropriately reduced when it can be ensured that the system can be made irrespective of the water-containing situation.
Further, the solar photo-thermal system 4 adopts tower photo-thermal heat collection or trough photo-thermal heat collection as required; the corresponding double-tank heat storage system 5 selects liquid metal, fused salt or heat conducting oil according to the system operation temperature section, and two heat storage tanks in the double-tank heat storage system 5 respectively store high-temperature and low-temperature media and are mutually standby; the double-tank heat storage system 5 is configured with electric heating to realize primary frequency modulation of the power supply output of the photovoltaic system 6 and the wind power system 7; the photovoltaic system 6 and the wind power system 7 are equipped according to the load characteristics and the maximum output level of the geothermal power station, and a power generation mode with photovoltaic wind power output mainly in the daytime and wind power and geothermal power mainly at night is formed.
Example 2:
referring to fig. 2, the operation method of the wind-light-geothermal integrated power generation and greenhouse thermal energy supply system comprises the following steps:
the system realizes the regulation of system energy storage and power generation through carbon dioxide circulation: an outlet of a carbon dioxide compression system to which the open carbon dioxide Brayton cycle power generation system 1 belongs is connected with an inlet of a geothermal storage system 2, an outlet of the geothermal storage system 2 is connected with an inlet of a carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system 1 belongs, an outlet of the carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system 1 belongs is connected with an inlet of a carbon dioxide storage tank 3, and an outlet of the carbon dioxide storage tank 3 is connected with an inlet of the carbon dioxide compression system to which the open carbon dioxide Brayton cycle power generation system 1 belongs to complete carbon dioxide circulation;
the system access power supply comprises a photovoltaic system 6, a wind power system 7 and a carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system 1 belongs; the system is connected with a compression system loaded with a carbon dioxide Brayton cycle power generation system 1 and a double-tank heat storage system 5 with electric heating, so that the surplus electric energy is stored and consumed;
the system is provided with a set of auxiliary heat source system, the core of the auxiliary heat source system is a double-tank heat storage system 5, and heat energy stored in the double-tank heat storage system 5 is derived from the solar photo-thermal system 4, the carbon dioxide compression system to which the open carbon dioxide Brayton cycle power generation system 1 belongs is used for compressing heat for recovery and electric energy which cannot be sent out by a power station; in winter, the heat stored in the double-tank heat storage system 5 is used as a heat source to heat the greenhouse through the greenhouse heat energy supply system 8 in addition to heating carbon dioxide.
Example 3:
according to actual power demand, the system can adjust the operation mode and realize different functions:
operation mode one, daytime peak regulation:
when the output of a power station is maximized or the load in an area reaches a peak value in the daytime power grid, the carbon dioxide is circularly and flexibly scheduled to run, at the moment, the carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system 1 belongs is started, and the carbon dioxide in the geothermal storage system 2 absorbs the heat in the double-tank heat storage system 5 to raise the temperature so as to push the expansion system to generate power; at the moment, the photovoltaic system 6 and the wind power system 7 output power simultaneously; in the stage, the peak regulation requirement of the power system is realized by adjusting the starting and frequency conversion of the carbon dioxide compression system to which the open carbon dioxide Brayton cycle power generation system 1 belongs and the variable working condition output of the carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system 1 belongs; when necessary, the electric heating in the double-tank heat storage system 5 is started to realize the consumption of frequency type unstable electric power;
operation mode two, night peak regulation:
at night, photovoltaic output is stopped, the power grid requirement and the load in the area are in a low state, carbon dioxide circulation is matched with the wind power system 7 to flexibly dispatch and operate, at the moment, the carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system 1 belongs is started, and carbon dioxide in the geothermal storage system 2 absorbs heat in the double-tank heat storage system 5 to raise the temperature so as to push the expansion system to generate power; in the stage, the peak regulation requirement of the power system is realized by adjusting the starting and frequency conversion of the carbon dioxide compression system to which the open carbon dioxide Brayton cycle power generation system 1 belongs and the variable working condition output of the carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system 1 belongs; when necessary, the electric heating in the double-tank heat storage system 5 is started to realize the consumption of frequency type unstable electric power;
operation mode three, renewable energy consumption:
when the output of the photovoltaic system 6 and the wind power system 7 in the daytime has higher stability margin with the power grid requirement or regional load, the carbon dioxide circulation takes the energy storage as a main target, at the moment, the carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system 1 belongs is closed, at the moment, the output of the photovoltaic system 6 and the wind power system 7 is mainly, and the peak regulation requirement of the power system is realized by the opening and frequency conversion of the carbon dioxide compression system to which the open carbon dioxide Brayton cycle power generation system 1 belongs; and if necessary, the electric heating in the double-tank heat storage system 5 is started to realize the consumption of the frequency type unstable electric power.
A large amount of waste heat can be discharged in the power generation process of the system, when a heat load is arranged near the deployment position of the system, the waste heat of the system participates in heating through transmission and distribution, and the radiation radius is less than 60 kilometers; when no heat load exists near the deployment position of the system, an unattended and soilless-planted factory is constructed for heat consumption.
Claims (10)
1. Wind-light-geothermal integrated power generation and greenhouse heat energy supply system is characterized in that: the open type carbon dioxide Brayton cycle power generation system (1) is connected with a geothermal storage system (2) and a carbon dioxide storage tank (3); the open carbon dioxide Brayton cycle power generation system (1) is connected with the double-tank heat storage system (5); the double-tank heat storage system (5) is connected with the solar photo-thermal system (4) and the greenhouse heat energy supply system (8); also comprises a photovoltaic system (6) and a wind power system (7).
2. The wind-light-geothermal integrated power generation and greenhouse thermal energy supply system according to claim 1, wherein: the open carbon dioxide Brayton cycle power generation system (1) is connected with a motor of a compression system to receive waste electricity from a photovoltaic system (6) and a wind power system (7), and compresses carbon dioxide stored in a carbon dioxide storage tank (3) to a geothermal storage system (2); the medium-high pressure supercritical carbon dioxide from the geothermal storage system (2) is subjected to temperature re-elevation through the double-tank heat storage system (5), and the stored pressure energy is converted into electric energy through the expansion system and the matched motor of the open carbon dioxide Brayton cycle power generation system (1).
3. The wind-light-geothermal integrated power generation and greenhouse thermal energy supply system according to claim 1, wherein: the heat stored in the double-tank heat storage system (5) supplies heat to the greenhouse through a greenhouse heat energy supply system (8).
4. The wind-light-geothermal integrated power generation and greenhouse thermal energy supply system according to claim 1, wherein: the carbon dioxide storage depth in the geothermal storage system (2) is 10000m at 1000-30 MPa, and the heating temperature is 600 ℃ at 150-30 ℃.
5. The wind-light-geothermal integrated power generation and greenhouse thermal energy supply system according to claim 4, wherein: the heat reservoir types of the geothermal storage system (2) are divided into a hydrothermal heat reservoir and a dry-heat rock heat reservoir; the hydrothermal heat reservoir utilizes a water conservancy system consisting of an underground reservoir space and related fractures as a corresponding gas storage space; the dry hot rock type heat reservoir utilizes a dry hot rock fracturing gap or a plume type geothermal system as a corresponding gas storage space.
6. The wind-light-geothermal integrated power generation and greenhouse thermal energy supply system according to claim 1, wherein: the storage pressure of the carbon dioxide storage tank (3) is the lowest operation pressure of the carbon dioxide Brayton cycle power generation system (1), and the operation pressure of the carbon dioxide storage tank (3) is ensured to be more than 10 MPa.
7. The wind-light-geothermal integrated power generation and greenhouse thermal energy supply system according to claim 1, wherein: the solar photo-thermal system (4) adopts tower photo-thermal heat collection or groove photo-thermal heat collection as required; the corresponding double-tank heat storage system (5) selects liquid metal, fused salt or heat conducting oil according to the system operation temperature section, and two heat storage tanks in the double-tank heat storage system (5) respectively store high-temperature and low-temperature media and are mutually standby; the double-tank heat storage system (5) is configured with electric heating to realize primary frequency modulation of the power output of the photovoltaic system (6) and the wind power system (7); the photovoltaic system (6) and the wind power system (7) are equipped according to the load characteristics and the maximum output level of the geothermal power station, and a power generation mode in which photovoltaic wind power output is dominant in daytime and wind power and geothermal power are dominant at night is formed.
8. The operation method of the wind-light-geothermal integrated power generation and greenhouse thermal energy supply system of any one of claims 1 to 7, wherein:
the system realizes the regulation of system energy storage and power generation through carbon dioxide circulation: an outlet of a carbon dioxide compression system to which the open carbon dioxide Brayton cycle power generation system (1) belongs is connected with an inlet of a geothermal storage system (2), an outlet of the geothermal storage system (2) is connected with an inlet of a carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system (1) belongs, an outlet of the carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system (1) belongs is connected with an inlet of a carbon dioxide storage tank (3), and an outlet of the carbon dioxide storage tank (3) is connected with an inlet of the carbon dioxide compression system to which the open carbon dioxide Brayton cycle power generation system (1) belongs to complete carbon dioxide circulation;
the system access power supply comprises a photovoltaic system (6), a wind power system (7) and a carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system (1) belongs; the system is connected with a compression system loaded with a carbon dioxide Brayton cycle power generation system (1) and a double-tank heat storage system (5) with electric heating, so that surplus electric energy can be stored and consumed;
the system is provided with a set of auxiliary heat source system, the core of the auxiliary heat source system is a double-tank heat storage system (5), the heat energy stored in the double-tank heat storage system (5) comes from a solar photo-thermal system (4), a carbon dioxide compression system to which the open carbon dioxide Brayton cycle power generation system (1) belongs is used for compressing heat for recovery, and electric energy which cannot be sent out by a power station is used; in winter, the heat stored in the double-tank heat storage system (5) is used as a heat source to heat the greenhouse through a greenhouse heat energy supply system (8) in addition to heating carbon dioxide.
9. The operation method of the wind-light-geothermal integrated power generation and greenhouse thermal energy supply system according to claim 8, wherein the system can adjust operation modes to realize different functions according to actual power demands:
operation mode one, daytime peak regulation:
when the output of a power station is maximized or the load in an area reaches a peak value in a daytime power grid, the carbon dioxide is circularly and flexibly scheduled to run, at the moment, the carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system (1) belongs is started, and the carbon dioxide in the geothermal storage system (2) absorbs the heat in the double-tank heat storage system (5) to raise the temperature so as to push the expansion system to generate power; at the same time, the photovoltaic system (6) and the wind power system (7) output power simultaneously; in the stage, the peak regulation requirement of the power system is realized by adjusting the starting and frequency conversion of a carbon dioxide compression system to which the open carbon dioxide Brayton cycle power generation system (1) belongs and the variable working condition output of a carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system (1) belongs; when necessary, the electric heating in the double-tank heat storage system (5) is started to realize the consumption of frequency type unstable electric power;
operation mode two, night peak regulation:
at night, photovoltaic output is stopped, the power grid requirement and the load in the area are in a low state, carbon dioxide circulation is matched with the wind power system (7) to flexibly dispatch and operate, at the moment, the carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system (1) belongs is started, and the carbon dioxide in the geothermal storage system (2) absorbs heat in the double-tank heat storage system (5) to raise the temperature so as to push the expansion system to generate power; in the stage, the peak regulation requirement of the power system is realized by adjusting the starting and frequency conversion of a carbon dioxide compression system to which the open carbon dioxide Brayton cycle power generation system (1) belongs and the variable working condition output of a carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system (1) belongs; when necessary, the electric heating in the double-tank heat storage system (5) is started to realize the consumption of frequency type unstable electric power;
operation mode three, renewable energy consumption:
when the output of the photovoltaic system (6) and the wind power system (7) in the daytime and the power grid requirement or regional load have higher stability margin, the carbon dioxide circulation takes the energy storage as a main target, at the moment, the carbon dioxide expansion system to which the open carbon dioxide Brayton cycle power generation system (1) belongs is closed, at the moment, the output of the photovoltaic system (6) and the wind power system (7) is dominant, and the peak regulation requirement of the power system is realized by the opening and frequency conversion of the carbon dioxide compression system to which the open carbon dioxide Brayton cycle power generation system (1) belongs; and if necessary, the electric heating in the double-tank heat storage system (5) is started to realize the consumption of the frequency type unstable electric power.
10. The operation method of the wind-light-geothermal integrated power generation and greenhouse thermal energy supply system according to claim 8, wherein a large amount of waste heat is discharged in the power generation process of the system, when a thermal load is present near the deployment position of the system, the waste heat of the system participates in heating through transmission and distribution, and the radiation radius is less than 60 km; when no heat load exists near the deployment position of the system, an unattended and soilless-planted factory is constructed for heat consumption.
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