CN110768281B - Urban distributed energy system - Google Patents
Urban distributed energy system Download PDFInfo
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- CN110768281B CN110768281B CN201911056114.7A CN201911056114A CN110768281B CN 110768281 B CN110768281 B CN 110768281B CN 201911056114 A CN201911056114 A CN 201911056114A CN 110768281 B CN110768281 B CN 110768281B
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/084—Pipe-line systems for liquids or viscous products for hot fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
- F24D11/003—Central heating systems using heat accumulated in storage masses water heating system combined with solar energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/07—Generating electrical power as side effect
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2270/00—Applications
- F17C2270/07—Applications for household use
- F17C2270/0763—Fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/34—Hydrogen distribution
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/45—Hydrogen technologies in production processes
Abstract
The invention relates to an urban distributed energy system, which comprises an urban power grid, a hydrogen storage unit, a hydrogen production enterprise unit and a plurality of residential subscriber units, wherein each residential subscriber unit comprises a plurality of energy consumption loads and an SOFC unit, and the SOFC unit at least comprises an SOFC component and a hot water storage tank; the hydrogen storage unit, the hydrogen production enterprise unit and the resident user unit are respectively connected with an urban power grid through power grid lines, and the hydrogen storage unit, the hydrogen production enterprise unit and the hot water storage tank are respectively connected with a main heat grid pipeline through a branch heat grid pipeline; the SOFC unit is connected with the hydrogen storage unit through a hydrogen pipeline; the SOFC component is used for generating power by utilizing the hydrogen provided by the hydrogen storage unit, and recovering heat energy generated in the power generation process of the SOFC component in a hot water mode, and the hot water storage tank is used for storing hot water recovered in the power generation process of the SOFC component. The invention can fully utilize clean energy and meet the power consumption requirement of users.
Description
Technical Field
The invention relates to the technical field of urban energy systems, in particular to an urban distributed energy system.
Background
The household fuel cell cogeneration system adopts a Proton Exchange Membrane Fuel Cell (PEMFC) or a Solid Oxide Fuel Cell (SOFC) as a power generation unit, the power generation efficiency can reach 40% to 60%, and the rest waste heat can be utilized to provide household hot water, so that the energy utilization efficiency of the whole system exceeds 90%.
Among them, the prague energy company (Plug Power) has developed a 7kW household cogeneration device, as shown in fig. 1, the device can directly provide the electric energy required by household appliances, lighting, heating, air conditioning, etc. for the user, and simultaneously, the waste heat discharged from the fuel cell can be recovered to heat water or heating. The domestic fuel cell may use pure hydrogen as fuel, but also natural gas, propane, methane, etc. The device is operative to provide electrical power to air conditioners, lighting and other household appliances, and to provide heating and hot water for the home.
In the process of implementing the invention, the inventor finds that the prior art has at least the following technical problems:
(1) the existing SOFC is mostly used for an independent combined heat and power system for household use, and when the electricity consumption of a user is low in load, redundant energy is not sent to a power grid and a heat supply network, so that the utilization of clean energy is insufficient.
(2) The existing household SOFC stops working after the hot water storage tank is full of capacity, so that power supply is interrupted, and the instant requirement of a user cannot be met only through the SOFC.
Disclosure of Invention
The invention aims to provide a city distributed energy system which can fully utilize clean energy and better meet the power consumption requirement of a user.
In order to achieve the purpose of the invention, the embodiment of the invention provides an urban distributed energy system, which comprises an urban power grid, a hydrogen storage unit, a hydrogen production enterprise unit and a plurality of residential subscriber units, wherein each residential subscriber unit comprises a plurality of energy consumption loads and an SOFC unit, and the SOFC unit at least comprises an SOFC component and a hot water storage tank; the hydrogen storage unit, the hydrogen production enterprise unit and the resident user units are respectively connected with the urban power grid through power grid lines, and the urban power grid is used for supplying power to the hydrogen storage unit, the hydrogen production enterprise unit and the plurality of resident user units; the hydrogen storage unit, the hydrogen production enterprise unit and the hot water storage tank are respectively connected with a main heat supply network pipeline through a branch heat supply network pipeline, and the main heat supply network pipeline is connected end to form a closed loop pipeline; the hydrogen storage unit is connected with the hydrogen production enterprise unit through a hydrogen pipeline, and the SOFC unit is connected with the hydrogen storage unit through a hydrogen pipeline; the SOFC component is used for generating power by utilizing the hydrogen provided by the hydrogen storage unit so as to supply power to the energy consumption load of the residential subscriber unit, and recovering heat energy generated in the power generation process of the SOFC component in a hot water mode so as to supply heat to the energy consumption load of the residential subscriber unit, and the hot water storage tank is used for storing hot water recovered in the power generation process of the SOFC component.
Preferably, a water inlet and a water outlet are arranged on the hot water storage tank, hot water recovered in the power generation process of the SOFC component flows into the hot water storage tank through the water inlet, the water outlet is communicated with the main heat supply network pipeline through a branch heat supply network pipeline, and the water outlet is arranged at the top of the hot water storage tank.
Preferably, a check valve is provided at the water inlet for preventing the reverse flow of the recovered hot water.
Preferably, a water pump is arranged on the main pipeline of the heat supply network, and the water pump is used for realizing hot water circulation in the main pipeline of the heat supply network.
Preferably, each residential subscriber unit includes a solar power generation assembly for generating electricity from solar energy to power energy consuming loads of the residential subscriber unit.
Preferably, the energy system further comprises a utility unit; the public facility unit is connected with the urban power grid through a power grid line, and the urban power grid is used for supplying power to the public facility unit; the public facility unit is connected with the main heat supply network pipeline through a branch heat supply network pipeline.
Preferably, the energy system further comprises a backup power station; the standby power station is connected with the urban power grid through a power grid line, and the urban power grid is used for supplying power to the standby power station; the standby power station is connected with the heat supply network main pipeline through a heat supply network branch pipeline; the standby power station is connected with the hydrogen production enterprise unit through a fossil energy pipeline.
Preferably, the SOFC unit further includes a hydrogen storage tank connected to the hydrogen storage unit through a hydrogen line, the hydrogen storage tank being configured to store hydrogen for emergency use by residents.
Preferably, an air compressor is arranged on a hydrogen pipeline between the hydrogen storage unit and the hydrogen production enterprise unit, and the air compressor is used for compressing hydrogen produced by the hydrogen production enterprise unit and then sending the compressed hydrogen to the hydrogen storage unit for storage.
In the embodiment of the invention, each resident user is provided with an SOFC unit, each SOFC unit comprises an SOFC component and a hot water storage tank, and a hydrogen storage unit, a hydrogen production enterprise unit and the hot water storage tank are respectively connected with a main heat supply network pipeline through a branch heat supply network pipeline, wherein the main heat supply network pipeline is connected end to form a closed-loop pipeline (to form an urban heat supply network); the hydrogen storage unit is connected with the hydrogen production enterprise unit through a hydrogen pipeline, and the SOFC unit is connected with the hydrogen storage unit through a hydrogen pipeline; in the using process, the SOFC component is used for generating power by utilizing the hydrogen provided by the hydrogen storage unit so as to supply power to energy consumption loads of the residential subscriber units, meanwhile, heat energy generated in the power generation process of the SOFC component is recovered in a hot water mode so as to supply heat to a plurality of energy consumption loads of the residential subscriber units, the hot water storage tank is used for storing the hot water recovered in the power generation process of the SOFC component, and when the hot water in the hot water storage tank exceeds the storage capacity of the hot water storage tank, redundant hot water flows into the main pipeline of the heat supply network so as to supply heat to other hydrogen storage units, hydrogen production enterprise units and residential subscribers. According to the embodiment of the invention, the SOFC unit is used as a power supply unit of the urban distributed energy network, the heat energy of the SOFC power generation byproduct is merged into the urban heat supply network, the industrial byproduct hydrogen is used as a main energy source for SOFC power generation, the energy utilization is flexible, and the utilization efficiency is high, so that the clean energy is fully utilized, and the power consumption requirement of a user is better met.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a 7kW household cogeneration device in the background art.
Fig. 2 is a schematic structural diagram of a distributed energy system in a city according to an embodiment of the present invention.
The labels in the figure are:
the system comprises 1-SOFC component, 2-hydrogen storage unit, 3-hydrogen production enterprise unit, 4-public facility, 5-standby power station, 6-urban power grid, 7-water pump, 8-air compressor, 9-hot water storage tank, 10-hydrogen storage tank, 11-solar power generation component and 12-resident user.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
In addition, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, well known means have not been described in detail so as not to obscure the present invention.
As shown in fig. 2, an embodiment of the present invention provides an urban distributed energy system, which includes an urban power grid 6, a hydrogen storage unit 1, a hydrogen-producing enterprise unit 3, and a plurality of residential subscriber units 12, where each residential subscriber unit 12 includes a plurality of energy consumption loads and an SOFC unit, where the SOFC unit includes at least an SOFC component 1 and a hot water storage tank 9; the hydrogen storage unit 1, the hydrogen production enterprise unit 3 and the resident user units 12 are respectively connected with the urban power grid 6 through power grid 6 lines, and the urban power grid 6 is used for supplying power to the hydrogen storage unit 1, the hydrogen production enterprise unit 3 and the plurality of resident user units 12; the hydrogen storage unit 1, the hydrogen production enterprise unit 3 and the hot water storage tank 9 are respectively connected with a main heat supply network pipeline through a branch heat supply network pipeline, and the main heat supply network pipeline is connected end to form a closed loop pipeline; the hydrogen storage unit 1 is connected with the hydrogen production enterprise unit 3 through a hydrogen pipeline, and the SOFC unit is connected with the hydrogen storage unit 1 through a hydrogen pipeline; the SOFC component 1 is configured to generate power by using the hydrogen provided by the hydrogen storage unit 1 to supply power to the energy consuming load of the residential subscriber unit 12, and recover the heat energy generated in the power generation process of the SOFC component 1 in the form of hot water to supply heat to the energy consuming load of the residential subscriber unit 12, and the hot water storage tank 9 is configured to store the hot water recovered in the power generation process of the SOFC component 1.
Specifically, the hydrogen production industrial unit refers to a hydrogen production enterprise such as a chemical plant, and the hydrogen production enterprise such as the chemical plant may produce exhaust gas hydrogen in a daily production process, in the energy system of this embodiment, the exhaust gas hydrogen of the hydrogen production enterprise such as the chemical plant is delivered to the hydrogen storage unit 1 through a hydrogen pipeline to be stored, the hydrogen storage unit 1 may be in the form of a hydrogen storage station, the residential subscriber unit 12 refers to a residential home user, an SOFC unit is configured for each household in the energy system of this embodiment, and the hydrogen stored in the hydrogen storage unit 1 is delivered to the SOFC unit of each household to perform SOFC power generation.
In the application process of the energy system, the residential family user mainly utilizes the SOFC unit to independently generate power to supply power to the household energy consumption load, and when the power generation electric energy of the SOFC unit does not meet the household energy consumption requirement, the power is supplemented by the electric energy provided by the urban power grid 6. In addition, the energy system of the embodiment provides a main pipeline of a heat supply network, the main pipeline of the heat supply network is connected end to form a closed-loop pipeline, the main pipeline of the heat supply network is an urban heat supply network of the energy system, each household SOFC component 1 generates heat in the power generation process, and exhaust gas generated by SOFC power generation has high temperature and high utilization value, so that the energy system of the embodiment recovers heat generated by SOFC power generation in a form of hot water, namely, heats water by using the heat generated by SOFC power generation, and then stores the heated hot water in the hot water storage tank 9 for residents to use. Further, because the storage capacity of the hot water storage tank 9 is limited, the energy system of the embodiment communicates the hot water storage tank 9 of each household with the main heat supply network line, when the hot water in the hot water storage tank 9 exceeds the storage capacity of the hot water storage tank 9, redundant hot water can be discharged into the main heat supply network line, and other energy consumption units can obtain hot water from the main heat supply network line, so that the energy is fully utilized, meanwhile, the waste gas and hydrogen of hydrogen production enterprises such as chemical plants are recycled, the waste gas pollution of the hydrogen production enterprises such as the chemical plants is reduced, and good environmental benefits are achieved. In addition, the SOFC is used as a power supply unit of the urban distributed energy network, and compared with a traditional Carnot cycle power generation mode, the power generation efficiency is obviously improved.
In some embodiments, the hot water storage tank 9 is provided with a water inlet through which hot water recovered in the power generation process of the SOFC component 1 flows into the hot water storage tank 9, and a water outlet which is communicated with the main heat supply network line through a branch heat supply network line, and is disposed at a top position of the hot water storage tank 9.
Specifically, in the present embodiment, the water outlet of the hot water storage tank 9 is disposed at the top position of the hot water storage tank 9, so that when the hot water in the hot water storage tank 9 exceeds the storage capacity of the hot water storage tank 9, the redundant hot water can be discharged into the main pipeline of the heat supply network.
In some embodiments, a check valve is provided at the water inlet to prevent the reverse flow of the recovered hot water.
In some embodiments, a water pump 7 is disposed on the main heat supply network line, and the water pump 7 is configured to provide power for the flow of hot water in the main heat supply network line, so as to realize circulation of hot water in the main heat supply network line.
In some embodiments, each residential unit 12 includes a solar power generation assembly 11, the solar power generation assembly 11 being configured to generate electricity from solar energy to power energy consuming loads of the residential unit 12.
In some embodiments, the energy system further comprises a utility unit 4; the public facility unit 4 is connected with the urban power grid 6 through a power grid 6 line, and the urban power grid 6 is used for supplying power to the public facility unit 4; the utility unit 4 is connected to the main heat supply network line via a branch heat supply network line.
Specifically, the utility unit 4 refers to energy consuming devices in various utilities in a city, such as schools, hospitals, and the like.
In some embodiments, the energy system further comprises a backup power station 5; the standby power station 5 is connected with the urban power grid 6 through a power grid 6 line, and the urban power grid 6 is used for supplying power to the standby power station 5; the standby power station 5 is connected with the heat supply network main pipeline through a heat supply network branch pipeline; the standby power station 5 is connected with the hydrogen production enterprise unit 3 through a fossil energy pipeline.
Specifically, the backup power station 5 has a cogeneration function, and when the SOFC device 1 is not sufficiently integrated in the heat supply network, the backup power station 5 consumes fossil fuel to supply heat to the heat supply network.
In some embodiments, the SOFC unit further comprises a hydrogen storage tank 10, the hydrogen storage tank 10 is connected to the hydrogen storage unit 1 through a hydrogen pipeline, and the hydrogen storage tank 10 is used for storing hydrogen for emergency use by residents.
In some embodiments, an air compressor 8 is disposed on the hydrogen pipeline between the hydrogen storage unit 1 and the hydrogen production enterprise unit 3, and the air compressor 8 is configured to compress the hydrogen generated by the hydrogen production enterprise unit 3 and then send the compressed hydrogen to the hydrogen storage unit 1 for storage.
As can be seen from the above description of the embodiment, the embodiment of the present invention provides an SOFC unit and a solar power generation assembly 11 for each household, where each SOFC unit includes an SOFC assembly 1 and a hot water storage tank 9, and the hydrogen storage unit 1, the hydrogen-producing enterprise unit 3, the hot water storage tank 9, and the public facilities are connected to the main pipeline of the heat supply network through a branch pipeline of the heat supply network.
The energy system adopts the SOFC component 1 and the solar power generation component 11 to generate power to generate electric energy for use by resident users, and redundant electric energy is allocated by the urban power grid 6 through a power grid 6 circuit and is used for meeting the use requirements of hydrogen production enterprises, public facilities and standby power stations 5 such as hydrogen storage stations, chemical plants and the like. When the SOFC component 1 and the solar power generation component 11 generate insufficient electric energy to meet the electricity load of the residential users, the electric grid 6 supplies the electric energy to the residential users through the electric grid 6. In use, the SOFC module 1 recovers and stores part of the thermal energy as hot water, and the hot water is stored in the hot water storage tank 9 and supplied to the residential users. The heated water storage tank 9 capacity restriction, when the hot water volume exceedes the storage tank capacity, the surplus hot water merges into the heat supply network pipeline, and the heat supply network pipeline sets up water pump 7 and realizes heat supply network energy circulation, gives hydrogen production enterprises such as hydrogen storage station, chemical plant, public facilities and stand-by power station 5 heat supply through the heat supply network pipeline. Wherein, need consume hydrogen and oxygen when SOFC subassembly 1 puts into service, set up hydrogen storage station and supply with compressed hydrogen to SOFC subassembly 1, the abandonment hydrogen that hydrogen enterprises such as chemical plant produced sends to hydrogen storage station storage after through the compression of air compressor machine 8, resident user sets up hydrogen storage tank 10 and regards as emergent air supply. When the SOFC component 1 and the solar power generation component 11 generate insufficient electric energy, the backup power station 5 consumes the fossil fuel to supply power to the power grid 6. The backup power station 5 is used as a supplement to the power supply of the SOFC component 1 and the solar power generation component 11, and is used for improving the reliability and flexibility of the energy network. In the embodiment, a distributed energy network is combined with plant bionics, the SOFC component 1 and the solar power generation component 11 are plant blades, hydrogen, oxygen and solar energy are plant blade energy sources, fossil energy pipelines, hydrogen pipelines, a power grid 6 pipeline and a heat supply network pipeline are ducts for transporting nutrients to plants, the standby power station 5 is a plant root, and the fossil energy provides nutrients for the root.
To sum up, the embodiment of the invention adopts clean energy power supply as the basis of the urban power supply network, solves the problem of environmental pollution caused by the use of a large amount of fossil energy, takes the SOFC as the power supply unit of the urban distributed energy network, and incorporates the heat energy of the byproduct of SOFC power generation into the urban heat supply network, thereby improving the energy utilization efficiency.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (6)
1. A city distributed energy system is characterized by comprising a city power grid, a hydrogen storage unit, a hydrogen production enterprise unit and a plurality of residential subscriber units, wherein each residential subscriber unit comprises a plurality of energy consumption loads and an SOFC unit, and the SOFC unit at least comprises an SOFC component and a hot water storage tank;
the hydrogen storage unit, the hydrogen production enterprise unit and the resident user units are respectively connected with the urban power grid through power grid lines, and the urban power grid is used for supplying power to the hydrogen storage unit, the hydrogen production enterprise unit and the plurality of resident user units;
the hydrogen storage unit, the hydrogen production enterprise unit and the hot water storage tank are respectively connected with a main heat supply network pipeline through a branch heat supply network pipeline, and the main heat supply network pipeline is connected end to form a closed loop pipeline; the hydrogen storage unit is connected with the hydrogen production enterprise unit through a hydrogen pipeline, and the SOFC unit is connected with the hydrogen storage unit through a hydrogen pipeline;
the SOFC component is used for generating power by utilizing the industrial byproduct hydrogen provided by the hydrogen storage unit so as to supply power to the energy consumption load of the residential subscriber unit, and recovering heat energy generated in the power generation process of the SOFC component in the form of hot water so as to supply heat to the energy consumption load of the residential subscriber unit, and the hot water storage tank is used for storing the hot water recovered in the power generation process of the SOFC component; the hot water storage tank is provided with a water inlet and a water outlet, hot water recovered in the power generation process of the SOFC component flows into the hot water storage tank through the water inlet, the water outlet is communicated with the main heat supply network pipeline through a branch heat supply network pipeline, and the water outlet is arranged at the top of the hot water storage tank; the water inlet is provided with a check valve which is used for preventing the recovered hot water from flowing backwards; and a water pump is arranged on the main pipeline of the heat supply network and is used for realizing hot water circulation in the main pipeline of the heat supply network.
2. The urban distributed energy system according to claim 1, wherein each residential unit comprises a solar power generation assembly for generating electricity from solar energy to power energy consuming loads of the residential unit.
3. The urban distributed energy system according to claim 1, wherein the energy system further comprises a utility unit; the public facility unit is connected with the urban power grid through a power grid line, and the urban power grid is used for supplying power to the public facility unit; the public facility unit is connected with the main heat supply network pipeline through a branch heat supply network pipeline.
4. The urban distributed energy system according to claim 1, wherein the energy system further comprises a backup power station; the standby power station is connected with the urban power grid through a power grid line, and the urban power grid is used for supplying power to the standby power station; the standby power station is connected with the heat supply network main pipeline through a heat supply network branch pipeline; the standby power station is connected with the hydrogen production enterprise unit through a fossil energy pipeline.
5. The urban distributed energy system according to claim 1, wherein the SOFC unit further comprises a hydrogen storage tank connected to the hydrogen storage unit via a hydrogen line, the hydrogen storage tank being configured to store hydrogen for emergency use by residents.
6. The urban distributed energy system according to claim 1, wherein an air compressor is disposed on the hydrogen pipeline between the hydrogen storage unit and the hydrogen production enterprise unit, and the air compressor is configured to compress hydrogen produced by the hydrogen production enterprise unit and send the compressed hydrogen to the hydrogen storage unit for storage.
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