CN112460669A - Energy storage type distributed energy system suitable for high latitude area - Google Patents

Energy storage type distributed energy system suitable for high latitude area Download PDF

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Publication number
CN112460669A
CN112460669A CN202011331343.8A CN202011331343A CN112460669A CN 112460669 A CN112460669 A CN 112460669A CN 202011331343 A CN202011331343 A CN 202011331343A CN 112460669 A CN112460669 A CN 112460669A
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CN
China
Prior art keywords
inlet
user terminal
combustion chamber
fermentation tank
waste heat
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Pending
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CN202011331343.8A
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Chinese (zh)
Inventor
熊英莹
王学义
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Shanxi University
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Shanxi University
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Priority to CN202011331343.8A priority Critical patent/CN112460669A/en
Publication of CN112460669A publication Critical patent/CN112460669A/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D11/00Central heating systems using heat accumulated in storage masses
    • F24D11/002Central heating systems using heat accumulated in storage masses water heating system
    • F24D11/003Central heating systems using heat accumulated in storage masses water heating system combined with solar energy
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12MAPPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M21/00Bioreactors or fermenters specially adapted for specific uses
    • C12M21/04Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12MAPPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M41/00Means for regulation, monitoring, measurement or control, e.g. flow regulation
    • C12M41/12Means for regulation, monitoring, measurement or control, e.g. flow regulation of temperature
    • C12M41/18Heat exchange systems, e.g. heat jackets or outer envelopes
    • C12M41/22Heat exchange systems, e.g. heat jackets or outer envelopes in contact with the bioreactor walls
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12MAPPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M43/00Combinations of bioreactors or fermenters with other apparatus
    • C12M43/04Bioreactors or fermenters combined with combustion devices or plants, e.g. for carbon dioxide removal
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12MAPPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M43/00Combinations of bioreactors or fermenters with other apparatus
    • C12M43/08Bioreactors or fermenters combined with devices or plants for production of electricity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03GSPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G6/00Devices for producing mechanical power from solar energy
    • F03G6/06Devices for producing mechanical power from solar energy with solar energy concentrating means
    • F03G6/065Devices for producing mechanical power from solar energy with solar energy concentrating means having a Rankine cycle
    • F03G6/067Binary cycle plants where the fluid from the solar collector heats the working fluid via a heat exchanger
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00Details
    • F24D19/10Arrangement or mounting of control or safety devices
    • F24D19/1006Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1042Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses solar energy
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/20Solar thermal
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/70Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/46Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines

Abstract

The invention belongs to the field of comprehensive utilization of energy, and particularly relates to an energy storage type distributed energy system suitable for high-latitude areas. The system comprises a solar heat reservoir, a fermentation tank, a combustion chamber, a power generation device, an electricity storage device, a waste heat recovery device, a lithium bromide refrigerating unit and a user terminal, wherein the heat storage device provides the optimal fermentation temperature for fermentation of the fermentation tank; the outlet of the fermentation tank is connected with the inlet of the combustion chamber, combustible gas generated by the fermentation tank is combusted in the combustion chamber, high-temperature gas generated by the combustion chamber enters a power generation system to be used as power for power generation, and generated power supplies power for the user terminal and the power storage device; the waste heat recovery device recovers the residual heat of the combustion chamber, supplies heat for a user terminal in winter, and supplies energy for the lithium bromide refrigerating unit in summer to provide enough cold energy; straw used during fermentation of the fermentation tank and a solar heat reservoir for heating the fermentation tank improve the utilization rate of solar energy and biomass raw materials to a great extent.

Description

Energy storage type distributed energy system suitable for high latitude area
Technical Field
The invention belongs to the field of comprehensive utilization of energy, and particularly relates to an energy storage type distributed energy system suitable for high-latitude areas.
Background
With the rapid development of modern industry and the acceleration of urban processes, the demand for electricity is increasing. The traditional centralized power supply mode has low energy utilization efficiency and extremely serious environmental pollution, so that the efficient and clean distributed energy system is generally regarded by all countries in the world. The distributed energy system can flexibly and efficiently output three loads of cold, heat and electricity to nearby users, reduces the loss of electric power in the transportation process and the number of transformer substations, effectively saves economic cost and improves economic benefits.
The application of the energy storage system can enable the voltage and the frequency of the distributed energy system to be more stable, and seamless switching of energy during grid connection and disconnection can be met.
The crop straw is a subsidiary crop in the production of grain crops and economic crops, and the direct combustion has low utilization rate and serious environmental pollution. Combustible gas generated after straw fermentation is used for power generation, and fermented residues can be processed into feed or chemical fertilizer for secondary utilization, so that the utilization rate of the straw can be improved, and the pollution to the environment is minimized. However, in north China, due to climate reasons, biogas power generation cannot be realized, and a large amount of crop straws and solar energy are wasted.
Disclosure of Invention
The present invention is directed to solving the above problems and providing an energy storage type distributed energy system suitable for high-altitude areas.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an energy storage type distributed energy system suitable for high latitude area, includes solar energy heat reservoir, fermentation vat, combustion chamber, power generation facility, power storage device, waste heat recovery device, lithium bromide refrigerating unit, user terminal, solar energy heat reservoir is fused salt energy memory, solar energy heat reservoir connects the fermentation vat through first time pipeline, the combustible gas export of fermentation vat links to each other with the combustible gas entry of combustion chamber, the first high-temperature gas export of combustion chamber with power generation facility's power input end is connected, power generation facility's output respectively with the first entry linkage of power storage device and user terminal be equipped with two floodgate formula temperature control switch on the first time pipeline, the other end of two floodgate formula temperature control switch passes through the second and returns the second entry linkage of pipeline and user terminal. The design reasonably solves the problems that the annual air temperature is low in high latitude areas and the optimal working temperature of the fermentation tank is between 32 ℃ and 35 ℃, the fermentation tank works at the optimal working temperature by utilizing the heat provided by the solar heat reservoir, the temperature of the fermentation tank can be controlled by the double-gate temperature control switch, the redundant heat of the solar heat reservoir is switched to a user terminal for use, and the heat utilization rate is improved.
Furthermore, a second high-temperature gas outlet of the combustion chamber is connected with a first inlet of the waste heat recovery device through a first water inlet pipe and used for heating water in the waste heat recovery device, a first outlet of the waste heat recovery device is connected with a third inlet of the user terminal through a pipeline provided with a heating water supply valve and used for heating, a first outlet of the user terminal is connected with a second inlet of the waste heat recovery device through a pipeline provided with a heating water return valve, the temperature of second high-temperature gas after methane combustion can reach 300 ℃, if the heat is not recovered, energy is wasted, the heat is connected with a water heat exchange waste heat recovery device, and hot water generated by heat exchange enters a heating system and directly enters the user terminal for use, so that the heat exchange is efficient and convenient.
Furthermore, a second outlet of the waste heat recovery device is connected with a first inlet of the lithium bromide refrigerating unit through a pipeline provided with a cooling water supply valve, a first outlet of the lithium bromide refrigerating unit is connected with a fourth inlet of the user terminal through a cooling pipeline and used for providing cooling capacity, a second outlet of the user terminal is connected with the first inlet of the lithium bromide refrigerating unit through a cooling air recovery pipeline, a second outlet of the lithium bromide refrigerating unit is connected with a third inlet of the waste heat recovery device through a cooling water return valve, the lithium bromide refrigerating unit is added, cooling needs in summer are met, a switching valve is utilized to close a heating system, heated water in the waste heat recovery device enters the lithium bromide refrigerating unit through the cooling water supply valve, and hot water which does work flows through the cooling water return valve and returns to the waste heat recovery device to continue heat exchange, so that circulation is formed. The cold air generated by the lithium bromide refrigerating unit is sent to the user terminal through the cold supply pipeline and then returned to the lithium bromide refrigerating unit through the cold air recovery pipeline.
Furthermore, a heat exchange pipe set and heat preservation equipment are arranged on the periphery of the fermentation tank, so that the energy loss of the system is reduced, and the energy utilization efficiency is improved.
Compared with the prior art, the invention has the following advantages:
(1) the solar heat storage device is used for supplying heat to the fermentation tank, so that the continuous and efficient work of the fermentation tank is ensured, the system runs stably, and meanwhile, the utilization rate of solar energy and biomass raw materials is improved to a great extent;
(2) the system utilizes the waste heat of the combustion chamber to respectively realize heating and cooling, and is energy-saving and environment-friendly;
(3) the whole system is complete, the coordination and the complementarity of all the parts are excellent, and the method is suitable for high-latitude areas.
Drawings
Fig. 1 is a schematic structural diagram of an energy storage type distributed energy system suitable for high-latitude areas according to the present invention;
wherein, 1 is the solar energy heat reservoir, 2 is the fermentation vat, 3 is the combustion chamber, 4 is power generation facility, 5 is the power storage device, 6 is waste heat recovery device, 7 is the lithium bromide refrigerating unit, 8 is user terminal, 9 is double-gate formula temperature detect switch, 10 is heating supply water valve, 11 is heating return valve, 12 is cooling supply water valve, 13 is cooling return valve, 14 is first return pipe, 15 is the second return pipe, 16 is first inlet tube, 17 is cooling pipeline, 18 is air conditioning recovery pipeline.
Detailed Description
As shown in fig. 1, the energy storage type distributed energy system suitable for high latitude areas of the present invention comprises a solar heat reservoir 1, a fermentation pool 2, a combustion chamber 3, a power generation device 4, an electricity storage device 5, a waste heat recovery device 6, a lithium bromide refrigeration unit 7, and a user terminal 8, wherein the solar heat reservoir 1 is a molten salt energy storage device, the solar heat reservoir 1 is connected to the fermentation pool 2 through a first return pipe 14, a combustible gas outlet of the fermentation pool 2 is connected to a combustible gas inlet of the combustion chamber 3, a heat exchange pipe group and a heat preservation device are disposed on the periphery of the fermentation pool 2, a first high temperature gas outlet of the combustion chamber 3 is connected to a power input end of the power generation device 4, an output end of the power generation device 4 is connected to first inlets of the electricity storage device 5 and the user terminal 8, a double-gate temperature control switch 9 is disposed on the first return pipe 14, the other end of the double-gate temperature control switch 9 is connected with a second inlet of the user terminal 8 through a second return pipeline 15; a second high-temperature gas outlet of the combustion chamber 3 is connected with a first inlet of the waste heat recovery device 6 through a first water inlet pipe 16 and is used for heating water in the waste heat recovery device 6, a first outlet of the waste heat recovery device 6 is connected with a third inlet of the user terminal 8 through a pipeline provided with a heating water supply valve 10 and is used for heating, and a first outlet of the user terminal 8 is connected with a second inlet of the waste heat recovery device 6 through a pipeline provided with a heating water return valve 11; a second outlet of the waste heat recovery device 6 is connected with a first inlet of a lithium bromide refrigerating unit 7 through a pipeline provided with a cold supply water supply valve 12, a first outlet of the lithium bromide refrigerating unit 7 is connected with a fourth inlet of a user terminal 8 through a cold supply pipeline 17 for supplying cold energy, a second outlet of the user terminal 8 is connected with a first inlet of the lithium bromide refrigerating unit 7 through a cold air recovery pipeline 18, and a second outlet of the lithium bromide refrigerating unit 7 is connected with a third inlet of the waste heat recovery device 6 through a cold supply water return valve 13;
as shown in fig. 1, the energy storage type distributed energy system suitable for high-latitude areas of the present invention includes a solar heat reservoir, a fermentation tank, a combustion chamber, a power generation device, an electricity storage device, a waste heat recovery device, a lithium bromide refrigeration unit, and a user terminal. The solar heat absorption energy storage device provides the optimal fermentation temperature for fermentation of the fermentation tank, the optimal fermentation temperature of the fermentation tank is 32-35 ℃, when the temperature of the fermentation tank reaches 35 ℃, the double-gate temperature control switch 9 automatically switches from the first return pipeline 14 to the second return pipeline 15, the outlet end of the second return pipeline 15 is connected with the user terminal 8, and the solar heat reservoir 1 provides low-quality domestic hot water for the user terminal 8. The exit end of the combustible gas of fermentation vat 2 is connected with the entrance point of the combustion chamber 3 that provides combustion space, the exit end of combustion chamber 3 is connected with power input of power generation facility 4, power generation facility 4's output is connected with user terminal 8 and accumulate device 5, accumulate device 5 stores unnecessary electric quantity, can purchase from the electric wire netting when the electricity price is low millet when necessary, deposit the electric quantity in accumulate device 5, discharge when the power consumption peak, can the rational planning power consumption time, save the cost.
In the process of cooling in summer, the heating water supply valve 10 and the heating water return valve 11 are firstly closed, and the heating system is isolated. Water in the waste heat recovery device 6 exchanges heat with high-temperature flue gas generated by the combustion chamber 3, the water heated in the waste heat recovery device 6 enters the lithium bromide refrigerating unit 7 through the cooling water supply valve 12, and the hot water which does work returns to the waste heat recovery device 6 through the cooling water return valve 13 to continue to exchange heat, so that circulation is formed. The cold air generated by the lithium bromide refrigerator unit 7 is sent to the user terminal 8 through the cold air supply pipeline 17, and then returned to the lithium bromide refrigerator unit 7 through the cold air recovery pipeline 18.
In the process of heating in winter, the cold supply cold water valve 12 and the cold supply water return valve 13 are closed firstly, and the cold supply system is isolated. Water in the waste heat recovery device 6 exchanges heat with high-temperature flue gas generated by the combustion chamber 3, heated water in the waste heat recovery device 6 reaches the user terminal 8 through the heating water supply valve 10 to supply heat, and the heated heating water returns to the waste heat recovery device 6 through the heating water return valve to continuously absorb heat to form circulation.

Claims (4)

1. An energy storage type distributed energy system suitable for high-altitude areas comprises a solar heat reservoir (1), a fermentation tank (2), a combustion chamber (3), a power generation device (4), an energy storage device (5), a waste heat recovery device (6), a lithium bromide refrigerating unit (7) and a user terminal (8), wherein the solar heat reservoir (1) is a molten salt energy storage device, the solar heat reservoir (1) is connected with the fermentation tank (2) through a first return pipeline (14), a combustible gas outlet of the fermentation tank (2) is connected with a combustible gas inlet of the combustion chamber (3), a first high-temperature gas outlet of the combustion chamber (3) is connected with a power input end of the power generation device (4), and an output end of the power generation device (4) is respectively connected with a first inlet of the energy storage device (5) and a first inlet of the user terminal (8), and a double-gate temperature control switch (9) is arranged on the first return pipeline (14), and the other end of the double-gate temperature control switch (9) is connected with a second inlet of the user terminal (8) through a second return pipeline (15).
2. The energy storage type distributed energy system applicable to high-altitude areas according to claim 1, wherein a second high-temperature gas outlet of the combustion chamber (3) is connected with a first inlet of the waste heat recovery device (6) through a first water inlet pipe (16) for heating water in the waste heat recovery device (6), a first outlet of the waste heat recovery device (6) is connected with a third inlet of the user terminal (8) through a pipeline provided with a heating water supply valve (10) for heating, and a first outlet of the user terminal (8) is connected with a second inlet of the waste heat recovery device (6) through a pipeline provided with a heating water return valve (11).
3. The energy storage type distributed energy system applicable to the high-latitude areas is characterized in that a second outlet of the waste heat recovery device (6) is connected with a first inlet of a lithium bromide refrigerating unit (7) through a pipeline provided with a cold supply water supply valve (12), a first outlet of the lithium bromide refrigerating unit (7) is connected with a fourth inlet of a user terminal (8) through a cold supply pipeline (18) and used for providing cold energy, a second outlet of the user terminal (8) is connected with the first inlet of the lithium bromide refrigerating unit (7) through a cold air recovery pipeline (19), and a second outlet of the lithium bromide refrigerating unit (7) is connected with a third inlet of the waste heat recovery device (6) through a cold supply water return valve (13).
4. The energy storage type distributed energy system applicable to high-latitude areas is characterized in that a heat exchange tube set and a heat preservation device are arranged on the periphery of the fermentation tank (2).
CN202011331343.8A 2020-11-24 2020-11-24 Energy storage type distributed energy system suitable for high latitude area Pending CN112460669A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10032528A1 (en) * 2000-07-05 2002-01-17 Berthold W Seemann Method of supplying heat for a building or part of building, involves formation of hydrogen for heating purposes
CN1896218A (en) * 2006-05-31 2007-01-17 袁铭鉴 Solarheat-collecting applicator in marsh-gas fermentation pool
CN101280223A (en) * 2008-04-14 2008-10-08 山东联合能源技术有限公司 Integrated gasification combined cycle thermoelectric oil gas multi-production process for efficient clean region
CN107524485A (en) * 2017-10-16 2017-12-29 河北工程大学 A kind of regenerative resource energy supplying system
CN210856090U (en) * 2019-10-18 2020-06-26 王乙为 Energy storage type distributed energy system
CN111928219A (en) * 2020-09-29 2020-11-13 国网(天津)综合能源服务有限公司 Distributed combined cooling heating and power system utilizing gas and complementary solar energy

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10032528A1 (en) * 2000-07-05 2002-01-17 Berthold W Seemann Method of supplying heat for a building or part of building, involves formation of hydrogen for heating purposes
CN1896218A (en) * 2006-05-31 2007-01-17 袁铭鉴 Solarheat-collecting applicator in marsh-gas fermentation pool
CN101280223A (en) * 2008-04-14 2008-10-08 山东联合能源技术有限公司 Integrated gasification combined cycle thermoelectric oil gas multi-production process for efficient clean region
CN107524485A (en) * 2017-10-16 2017-12-29 河北工程大学 A kind of regenerative resource energy supplying system
CN210856090U (en) * 2019-10-18 2020-06-26 王乙为 Energy storage type distributed energy system
CN111928219A (en) * 2020-09-29 2020-11-13 国网(天津)综合能源服务有限公司 Distributed combined cooling heating and power system utilizing gas and complementary solar energy

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