CN114719250A - Low-carbon power generation system for coupling new energy and coal-fired power plant by using green ammonia as carrier - Google Patents
Low-carbon power generation system for coupling new energy and coal-fired power plant by using green ammonia as carrier Download PDFInfo
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- CN114719250A CN114719250A CN202210403320.6A CN202210403320A CN114719250A CN 114719250 A CN114719250 A CN 114719250A CN 202210403320 A CN202210403320 A CN 202210403320A CN 114719250 A CN114719250 A CN 114719250A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/04—Purification or separation of nitrogen
- C01B21/0405—Purification or separation processes
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/04—Preparation of ammonia by synthesis in the gas phase
- C01C1/0405—Preparation of ammonia by synthesis in the gas phase from N2 and H2 in presence of a catalyst
- C01C1/0488—Processes integrated with preparations of other compounds, e.g. methanol, urea or with processes for power generation
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/60—Constructional parts of cells
- C25B9/65—Means for supplying current; Electrode connections; Electric inter-cell connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
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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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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/133—Renewable energy sources, e.g. sunlight
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Abstract
The invention discloses a low-carbon power generation system for coupling new energy and a coal-fired power station by using green ammonia as a carrier, and belongs to the field of new energy electric power consumption and coal-fired power station carbon reduction. The wall surface of the furnace chamber of the pulverized coal boiler is provided with an ammonia burner, and the green ammonia synthesized by the ammonia synthesis tower is conveyed to the ammonia burner through an ammonia supply system and finally sprayed into the pulverized coal boiler for combustion to replace part of fire coal. According to the invention, green hydrogen and green nitrogen are prepared by using new energy electric power, then green ammonia which is more convenient to transport and store is synthesized, and finally the green ammonia is used as an energy carrier to be transported outwards, so that the problem of new energy grid-connected transport is effectively alleviated.
Description
Technical Field
The invention belongs to the field of new energy power consumption and carbon reduction of coal-fired power stations, and particularly relates to a low-carbon power generation system coupling a new energy and a coal-fired power station by using green ammonia as a carrier.
Background
Under the background of carbon peak reaching and carbon neutralization targets, a novel electric power system taking new energy as a main body in China is being built in an accelerating way. However, the problem of absorption is gradually highlighted behind the rapid increase in installed capacity of new energy power generation. Due to the fact that randomness, volatility and intermittence of new energy power generation are large, and areas with rich wind and light resources are far away from a load center, higher requirements are put forward for the flexibility controllability and the delivery mutual aid capability of a power grid, and new energy power generation grid connection becomes an important factor restricting the development of the new energy power generation grid connection.
The improvement of the new energy consumption capability on the spot is a favorable measure for relieving the grid-connected new energy conveying difficulty. The hydrogen is produced by electrolyzing water by using the new energy power, so that the new energy with large volatility can be consumed and stored on site, and the problem of carbon emission of the traditional hydrogen production by fossil energy can be solved. However, the long-distance transportation cost and safety of the green hydrogen become important factors for restricting the development of the green hydrogen. Ammonia is easier to liquefy than hydrogen, and the storage and transportation technology is mature and widely applied. Therefore, after the green hydrogen is prepared, part of new energy electric power can be used for separating air to prepare nitrogen, the nitrogen and the green hydrogen are subjected to chemical synthesis reaction to obtain green ammonia, and the green ammonia is finally taken as an energy carrier to be conveyed outwards.
Coal-fired power stations are used as coal consumers, and the discharged flue gas contains a large amount of carbon dioxide, which is usually a main contributor to carbon emission in a region. By using carbon-free fuel instead of coal, the carbon emission of the power station can be reduced from the source. The ammonia has high energy density, can be used as fuel, and does not generate carbon dioxide when the ammonia is combusted. Therefore, the coal-fired power plant can use ammonia as fuel to replace part of coal. Because of zero carbon emission of the whole life cycle of the green ammonia, the coal-fired power station doped with the green hydrogen can really achieve the purpose of carbon reduction.
Disclosure of Invention
The invention aims to provide a low-carbon power generation system coupling new energy and a coal-fired power station by using green ammonia as a carrier, which can solve the problem of new energy consumption, reduce carbon emission of the coal-fired power station and adapt to and lead the realization of a double-carbon target.
Therefore, the invention provides a low-carbon power generation system coupling new energy with a coal-fired power plant by using green ammonia as a carrier, which comprises an energy power generation device, an electrolytic hydrogen production tank, an air separation device, an ammonia synthesis tower, an ammonia supply system, an ammonia burner and a pulverized coal boiler, wherein the output end of the energy power generation device is connected with power interfaces of the electrolytic hydrogen production tank and the air separation device, a hydrogen outlet of the electrolytic hydrogen production tank is communicated with a hydrogen inlet of the ammonia synthesis tower, and a nitrogen outlet of the air separation device is communicated with a nitrogen inlet of the ammonia synthesis tower;
the wall surface of the furnace chamber of the pulverized coal boiler is provided with an ammonia burner, and the green ammonia synthesized by the ammonia synthesis tower is conveyed to the ammonia burner through an ammonia supply system and finally sprayed into the pulverized coal boiler for combustion to replace part of fire coal.
Preferably, the proportion of green ammonia substituted for coal is 0-50%.
Preferably, the electrolytic hydrogen production cell can adopt alkaline liquid electrolysis, proton exchange membrane water electrolysis or solid oxide water electrolysis.
Preferably, the ammonia combustor is a liquid ammonia combustor or an ammonia gas combustor, and the ammonia combustor is provided with an air inlet and a liquid ammonia or ammonia gas inlet.
Preferably, the ammonia supply system is a liquid ammonia supply system or an ammonia gas supply system.
Preferably, the ammonia supply system includes liquid ammonia storage tank, liquid ammonia delivery pump and supplies the ammonia pipeline, the export of liquid ammonia storage tank and the entry intercommunication of liquid ammonia delivery pump, the export of liquid ammonia delivery pump and the ammonia entry intercommunication of ammonia combustor.
Preferably, the ammonia supply system further comprises an ammonia gas evaporator, an outlet of the liquid ammonia storage tank is communicated with an inlet of the liquid ammonia delivery pump, an outlet of the liquid ammonia delivery pump is communicated with an inlet of the ammonia gas evaporator, and an outlet of the ammonia gas evaporator is communicated with an ammonia inlet of the ammonia combustor.
Preferably, the pulverized coal fired boiler adopts a four-corner tangential firing mode, a front-back wall opposed firing mode or a W-shaped flame firing mode.
Preferably, the energy generation device comprises a wind power generation device or a solar power generation device.
Preferably, the power generated by the energy generating device is used for supplying power for the hydrogen electrolytic cell, the hydrogen-air separation device and the nitrogen.
Compared with the prior art, the invention has the characteristics and beneficial effects that:
(1) according to the invention, green hydrogen and green nitrogen are prepared by using new energy electric power, then green ammonia which is more convenient to transport and store is synthesized, and finally the green ammonia is used as an energy carrier to be transported outwards, so that the problem of new energy grid-connected transport is effectively alleviated.
(2) The coal-fired power station disclosed by the invention is doped with green ammonia to replace 0-50% of coal for power, and carbon is not generated in the ammonia combustion process, so that the carbon emission of the coal-fired power station can be effectively reduced.
(3) The whole life cycle of the green ammonia has no carbon emission, and the industrial chain of ammonia preparation, transportation and storage is mature, so that the green energy is a green energy suitable for popularization and application.
(4) The invention reasonably selects the proportion of the doped ammonia according to factors such as unit load, coal type characteristics, addition amount and the like, and realizes stable combustion in the furnace by controlling primary air quantity, secondary air quantity and ammonia injection quantity.
Drawings
FIG. 1 is a schematic diagram of a low carbon power generation system of the present invention.
The attached drawings are marked as follows: 1-energy power generation device, 2-electrolytic hydrogen production tank, 3-hydrogen, 4-air separation device, 5-nitrogen, 6-ammonia synthesis tower, 7-green ammonia, 8-pulverized coal boiler, 9-ammonia burner and 10-ammonia supply system.
Detailed Description
In order to make the technical means, innovative features, objectives and functions realized by the present invention easy to understand, the present invention is further described below.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the low-carbon power generation system coupling a new energy source using green ammonia as a carrier with a coal-fired power plant comprises an energy power generation device 1, an electrolytic hydrogen production tank 2, an air separation device 4, an ammonia synthesis tower 6, an ammonia supply system 10, an ammonia burner 9 and a pulverized coal boiler 8.
The energy generation device 1 includes a wind power generation device or a solar power generation device. The power generated by the energy power generation device 1 is used for supplying power to the electrolytic hydrogen production tank 2, the hydrogen 3 air separation device 4 and the nitrogen 5, and the problem of new energy power consumption is solved. The output end of the energy power generation device 1 is connected with the power interfaces of the electrolytic hydrogen production tank 2 and the air separation device 4, the hydrogen outlet of the electrolytic hydrogen production tank 2 is communicated with the hydrogen inlet of the ammonia synthesis tower 6, and the nitrogen outlet of the air separation device 4 is communicated with the nitrogen inlet of the ammonia synthesis tower 6. The electrolytic hydrogen production tank 2 can adopt alkaline liquid electrolysis, proton exchange membrane water electrolysis or solid oxide water electrolysis. A green ammonia synthesis device is constructed in a photovoltaic power station on the A site in a matching way, and power sources required by the electrolytic hydrogen production tank 2, the air separation device 4 and matched electric equipment are provided by photovoltaic power generation.
The wall surface of the furnace chamber of the pulverized coal boiler 8 is provided with an ammonia burner 9, the green ammonia synthesized by the ammonia synthesis tower 6 is conveyed to the ammonia burner 9 through an ammonia supply system 10, and finally is sprayed into the pulverized coal boiler 8 to be combusted to replace part of fire coal. Specifically, the proportion of green ammonia replacing coal is 0-50%, and the ammonia supply amount and the air amount of the ammonia combustor 9 can be adjusted in real time according to the unit load and the coal powder adding amount. The ammonia combustor 9 is a liquid ammonia combustor or an ammonia combustor, and the ammonia combustor 9 is provided with an air inlet and a liquid ammonia or ammonia inlet. The ammonia burner 9 may be arranged in combination with the pulverized coal burner, i.e. the ammonia supply system 10 is connected to the primary or secondary air or over-fire air line of the pulverized coal burner. The ammonia supply system 10 is a liquid ammonia supply system or an ammonia gas supply system. The pulverized coal boiler 8 adopts a four-corner tangential firing mode, a front-rear wall opposed firing mode or a W-shaped flame firing mode.
The ammonia supply system 10 comprises a liquid ammonia storage tank, a liquid ammonia delivery pump and an ammonia supply pipeline, an outlet of the liquid ammonia storage tank is communicated with an inlet of the liquid ammonia delivery pump, and an outlet of the liquid ammonia delivery pump is communicated with an ammonia inlet of the ammonia combustor 9.
More preferably, the ammonia supply system 10 further comprises an ammonia gas evaporator, an outlet of the liquid ammonia storage tank is communicated with an inlet of the liquid ammonia delivery pump, an outlet of the liquid ammonia delivery pump is communicated with an inlet of the ammonia gas evaporator, and an outlet of the ammonia gas evaporator is communicated with an ammonia inlet of the ammonia combustor 9.
The principle of the low-carbon power generation system is as follows: hydrogen 3 produced by the electrolytic hydrogen production tank 2 and nitrogen 5 produced by the air separation device 4 are subjected to chemical reaction in an ammonia synthesis tower 6 to produce green ammonia 7. The green ammonia 7 is transported to a coal-fired power plant at the site B through a liquid ammonia tank car and stored in a liquid ammonia storage tank. The coal-fired power plant mixes the burning ammonia in a liquid form, so the ammonia supply system 10 does not comprise an ammonia gas evaporator, namely, liquid ammonia in the storage tank is conveyed to the pulverized coal boiler 8 through a liquid ammonia delivery pump, and is conveyed to the pulverized coal boiler 8 for burning through an ammonia burner 9 arranged on the wall surface of a hearth. According to the unit load, the coal type characteristics and the addition amount, the ammonia supply amount and the air amount of the ammonia combustor are adjusted in real time, and the stable combustion of the boiler is guaranteed. Besides being delivered to a coal-fired power plant for combustion, the green ammonia 7 can also be used as a fuel for ships and automobiles and a chemical raw product.
The above examples are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. The low-carbon power generation system is characterized by comprising an energy power generation device (1), an electrolytic hydrogen production tank (2), an air separation device (4), an ammonia synthesis tower (6), an ammonia supply system (10), an ammonia burner (9) and a pulverized coal boiler (8), wherein the output end of the energy power generation device (1) is connected with power interfaces of the electrolytic hydrogen production tank (2) and the air separation device (4), a hydrogen outlet of the electrolytic hydrogen production tank (2) is communicated with a hydrogen inlet of the ammonia synthesis tower (6), and a nitrogen outlet of the air separation device (4) is communicated with a nitrogen inlet of the ammonia synthesis tower (6);
the wall surface of a furnace chamber of the pulverized coal boiler (8) is provided with an ammonia burner (9), green ammonia synthesized by the ammonia synthesis tower (6) is conveyed to the ammonia burner (9) through an ammonia supply system (10), and finally the green ammonia is sprayed into the pulverized coal boiler (8) to be combusted to replace part of fire coal.
2. The system for low-carbon power generation by coupling new energy with a coal-fired power plant by using green ammonia as a carrier according to claim 1, wherein the proportion of green ammonia replacing coal is 0-50%.
3. The low-carbon power generation system coupled with the coal-fired power plant by using the new energy with green ammonia as the carrier according to claim 1, wherein the electrolytic hydrogen production tank (2) can adopt alkaline liquid electrolysis, proton exchange membrane water electrolysis or solid oxide water electrolysis.
4. The system for coupling the new energy source using green ammonia as the carrier with the coal-fired power plant as recited in claim 1, wherein the ammonia burner (9) is a liquid ammonia burner or an ammonia gas burner, and the ammonia burner (9) is provided with an air inlet and a liquid ammonia or ammonia gas inlet.
5. The system for coupling new energy sources using green ammonia as a carrier with a coal-fired power plant as claimed in claim 1, wherein the ammonia supply system (10) is a liquid ammonia supply system or an ammonia gas supply system.
6. The low-carbon power generation system for coupling new energy resources with green ammonia as a carrier with a coal-fired power plant according to claim 1, wherein the ammonia supply system (10) comprises a liquid ammonia storage tank, a liquid ammonia delivery pump and an ammonia supply pipeline, an outlet of the liquid ammonia storage tank is communicated with an inlet of the liquid ammonia delivery pump, and an outlet of the liquid ammonia delivery pump is communicated with an ammonia inlet of the ammonia combustor (9).
7. The low-carbon power generation system for coupling new energy resources utilizing green ammonia as a carrier with a coal-fired power plant according to claim 6, characterized in that the ammonia supply system (10) further comprises an ammonia gas evaporator, an outlet of the liquid ammonia storage tank is communicated with an inlet of a liquid ammonia delivery pump, an outlet of the liquid ammonia delivery pump is communicated with an inlet of the ammonia gas evaporator, and an outlet of the ammonia gas evaporator is communicated with an ammonia inlet of the ammonia combustor (9).
8. The low-carbon power generation system coupling a new energy source and a coal-fired power plant by using green ammonia as a carrier according to claim 1, wherein the pulverized coal boiler (8) adopts a four-corner tangential firing mode, a front-rear wall opposed firing mode or a W-shaped flame firing mode.
9. The low-carbon power generation system for coupling new energy with a coal-fired power plant by using green ammonia as a carrier according to claim 1, characterized in that the energy power generation device (1) comprises a wind power generation device or a solar power generation device.
10. The low-carbon power generation system for coupling new energy with a coal-fired power plant by using green ammonia as a carrier according to claim 1, characterized in that the power generated by the energy power generation device (1) is used for supplying power to the electrolytic hydrogen production tank (2), the hydrogen (3) and air separation device (4) and the nitrogen (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210403320.6A CN114719250A (en) | 2022-04-18 | 2022-04-18 | Low-carbon power generation system for coupling new energy and coal-fired power plant by using green ammonia as carrier |
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| CN202210403320.6A CN114719250A (en) | 2022-04-18 | 2022-04-18 | Low-carbon power generation system for coupling new energy and coal-fired power plant by using green ammonia as carrier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115930215A (en) * | 2022-11-21 | 2023-04-07 | 上海慕帆动力科技有限公司 | Energy storage system based on oxyhydrogen combustion technology and operation method |
| CN116282069A (en) * | 2023-02-16 | 2023-06-23 | 河北正元氢能科技有限公司 | Gray hydrogen green hydrogen coupling ammonia production system |
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2022
- 2022-04-18 CN CN202210403320.6A patent/CN114719250A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115930215A (en) * | 2022-11-21 | 2023-04-07 | 上海慕帆动力科技有限公司 | Energy storage system based on oxyhydrogen combustion technology and operation method |
| CN115930215B (en) * | 2022-11-21 | 2023-09-26 | 上海慕帆动力科技有限公司 | Energy storage system based on oxyhydrogen combustion technology and operation method |
| CN116282069A (en) * | 2023-02-16 | 2023-06-23 | 河北正元氢能科技有限公司 | Gray hydrogen green hydrogen coupling ammonia production system |
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