CN112725034A - Renewable energy power-to-gas system coupled with biomass gasification - Google Patents
Renewable energy power-to-gas system coupled with biomass gasification Download PDFInfo
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- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
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- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
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- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
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- C25B1/00—Electrolytic production of inorganic compounds or non-metals
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- C25B1/04—Hydrogen or oxygen by electrolysis of water
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- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/0916—Biomass
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- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0959—Oxygen
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- C10J2300/00—Details of gasification processes
- C10J2300/12—Heating the gasifier
- C10J2300/1246—Heating the gasifier by external or indirect heating
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- C10J2300/00—Details of gasification processes
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- C10J2300/1603—Integration of gasification processes with another plant or parts within the plant with gas treatment
- C10J2300/1618—Modification of synthesis gas composition, e.g. to meet some criteria
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- C10J2300/00—Details of gasification processes
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- C10J2300/164—Integration of gasification processes with another plant or parts within the plant with conversion of synthesis gas
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Abstract
The invention provides a renewable energy power-to-gas system coupled with biomass gasification, which comprises: the system comprises a water electrolysis hydrogen production unit, a biomass gasification unit and a methanation unit; the energy input end of the water electrolysis hydrogen production unit and the energy output end of the renewable energy power generation system; the raw material input end of the water electrolysis hydrogen production unit is respectively communicated with an external water source and the steam outlet of the methanation unit; the oxygen inlet of the biomass gasification unit is communicated with the oxygen outlet of the water electrolysis hydrogen production unitThe gasification steam inlet of the biomass gasification unit is communicated with the steam outlet of the methane unit; and a raw gas inlet of the methanation unit is respectively communicated with a hydrogen outlet of the electrolyzed water hydrogen production unit and a gasified synthesis gas outlet of the biomass gasification unit. In the present invention, CO/CO is carried out2The methanation process of the same system saves CO2The energy consumption in the separation process can obviously improve the energy conversion efficiency of the whole electricity-to-gas conversion.
Description
Technical Field
The invention relates to the technical field of renewable energy sources, in particular to a renewable energy source electricity-to-gas system coupled with biomass gasification.
Background
The construction of energy Internet in China is an important measure about the promotion of new strategy of energy safety, the construction of domestic and global energy Internet and other related requirements, and the energy consumption pattern mainly comprising electric energy instead of coal, oil, gas and firewood is formed by changing the energy consumption mode by taking electricity as the center; meanwhile, the novel green circulating industry is developed by relying on sufficient and economic clean energy to generate electricity and promoting fuels and raw materials for producing hydrogen, methane and the like by electricity.
Because the output of the renewable energy has the characteristics of fluctuation, randomness and seasonality, the uncertainty of the power system is increased, and the problem of absorption is increasingly highlighted. The rapid development of wind power generation and photovoltaic power generation makes the difficulty of power transmission and comprehensive consumption prominent, and some traditional energy storage technologies cannot meet the storage of renewable energy sources, so that wind and light are forced to be abandoned in most cases.
As an important technology for new energy consumption and electric-gas coupling, Power-to-gas (P2G) technology has also received increasing attention in recent years. The electricity-to-gas technology can convert surplus electric energy (wind and light abandoning and the like) into hydrogen/natural gas for storage or transportation when the new energy output is excessive, and convert the stored gas into electric energy to feed back to a power grid when the electric energy is needed, so that the renewable energy consumption capacity of the system is improved, the bidirectional closed-loop energy flow of electric power and natural gas is realized, and the coupling between an electric power-natural gas system and the energy supply stability of the system are enhanced.
The main problem that present electricity changes gas technique exists is that energy conversion efficiency is lower: the energy efficiency of the water electrolysis process can reach 75-85%, the efficiency of the methanation process is about 75-80%, the chemical reaction of the two stages is integrated, the efficiency of P2G is only 45-60%, and the serious condition is thatThe further popularization and application of the electric gas conversion technology are limited. In addition, the methanation process needs to provide a stable carbon source as a raw material, and the conventional thinking is to supply power, industrial tail gas or CO in the atmosphere2Separating to obtain carbon source, and carrying out Sabatier catalytic reaction on the carbon source and hydrogen obtained by electrolysis to generate methane and water (CO)2+4H2→CH4+2H2O）。CO2In the separation process, a large amount of energy is often consumed, and the equipment investment and the operation cost are high.
For example, the carbon source CO of the present electrotransformation process2Mainly from fossil energy, and adopts CO treatment on flue gas or synthesis gas of coal-fired power plant, cement plant, iron and steel plant, and coal chemical plant2Separated, carbon emission in the whole life cycle is not reduced, and CO is obtained2The acquisition of the carbon dioxide is required to be firstly carried out through a trapping process, and the energy consumption of the trapping process is high. Taking coal-fired power plants as an example, CO is adopted2The captured coal-fired power plant needs to consume a large amount of extracted steam (3-4 GJ/t-CO) of a steam turbine2) The method is used for the desorption process, so that the generated energy of a power plant is greatly reduced, and the generating efficiency is reduced by more than 10 percent. And will use additional land, additional CO2Capture equipment, etc., resulting in additional capital operating costs.
Disclosure of Invention
In view of this, the invention provides an electric gas conversion system coupled with biomass gasification, and aims to solve the problems that the existing electric gas conversion process is low in overall efficiency and low in utilization rate of process heat energy and intermediate products.
The invention provides a renewable energy power-to-gas system coupled with biomass gasification, which comprises: the system comprises a water electrolysis hydrogen production unit, a biomass gasification unit and a methanation unit; wherein the content of the first and second substances,
the energy input end of the water electrolysis hydrogen production unit is respectively communicated with the energy output end of the power generation system and is used for electrolyzing water under the supply of electric energy generated by the power generation system; an external water source and a steam outlet of the methanation unit are respectively communicated with a raw material input end of the water electrolysis hydrogen production unit and used for transmitting water or steam to the water electrolysis hydrogen production unit and transmitting heat energy required by the water electrolysis hydrogen production unit;
the biomass gasification unit is provided with a biomass inlet for communicating with an external biomass source;
an oxygen inlet of the biomass gasification unit is communicated with an oxygen outlet of the electrolyzed water hydrogen production unit, a steam outlet of the methane unit is communicated with a gasification steam inlet of the biomass gasification unit, and the methane unit is used for transmitting steam to the biomass gasification unit and simultaneously transmitting partial heat energy required by the biomass gasification unit;
the raw gas inlet of the methanation unit is respectively communicated with the hydrogen outlet of the electrolyzed water hydrogen production unit and the gasified synthesis gas outlet of the biomass gasification unit so as to utilize H2And CO, CO2Preparation of CH by joint reaction4。
Further, in the above renewable energy power to gas conversion system coupled with biomass gasification, the hydrogen production unit by water electrolysis includes: the device comprises an electrolysis device, a hydrogen compressor, an oxygen compressor and an oxygen storage tank; wherein the content of the first and second substances,
the raw material inlet of the electrolysis device is communicated with an external water source and the steam outlet of the methanation unit and is used for generating H by utilizing the electrolysis process under the driving of electric energy and heat energy2And O2；
A hydrogen outlet of the electrolysis device is communicated with an inlet of the hydrogen compressor, and an outlet of the hydrogen compressor is communicated with a raw gas inlet of the methanation unit, so that the hydrogen output by the electrolysis device is pressurized and then is conveyed to the methanation unit;
an oxygen outlet of the electrolysis device is communicated with an inlet of the oxygen compressor, and an outlet of the oxygen compressor is communicated with an inlet of the oxygen storage tank, so that oxygen output by the electrolysis device is pressurized and then conveyed to the oxygen storage tank; the first outlet of the oxygen storage tank is communicated with the oxygen inlet of the biomass gasification unit and used for providing oxygen for the biomass gasification unit, and the second outlet of the oxygen storage tank is used for outputting partial oxygen as a product.
Preferably, the water electrolysis hydrogen production unit may further include: hydrogen-water heat exchangers and oxygen-water heat exchangers; wherein the content of the first and second substances,
two inlets of the oxygen-water heat exchanger are respectively communicated with an oxygen outlet of the electrolysis device and the external water source, so that the oxygen generated in the electrolysis device exchanges heat with the external water source, and the sensible heat of the oxygen is recovered by using the external water source;
two inlets of the hydrogen-water heat exchanger are respectively communicated with a hydrogen outlet of the electrolysis device and the external water source, so that the hydrogen generated in the electrolysis device exchanges heat with the external water source, and the sensible heat of the hydrogen is recovered by utilizing the external water source.
Further, in the renewable energy power to gas conversion system coupled with biomass gasification, the electrolysis device is an alkaline solution electrolysis device, a proton exchange membrane electrolysis device or a high-temperature solid oxide high-temperature electrolysis device.
Further, in the above renewable energy power to gas conversion system coupled with biomass gasification, the biomass gasification unit includes: a gasification furnace and a synthesis gas purification device; wherein the content of the first and second substances,
the gasification furnace is respectively provided with a biomass inlet, an oxygen inlet and a gasification steam inlet and is respectively communicated with an external biomass source, an oxygen outlet of the electrolyzed water hydrogen production unit and a steam outlet of the methanation unit;
the inlet of the synthetic gas purification device is communicated with the gasified synthetic gas outlet of the gasification furnace and used for removing impurities in the synthetic gas, and the purified synthetic gas outlet of the synthetic gas purification device is communicated with the raw gas inlet of the methanation unit.
Further, in the above renewable energy power to gas conversion system coupled with biomass gasification, the biomass gasification unit further includes: a syngas-steam heat exchanger; wherein the content of the first and second substances,
a first inlet of the synthesis gas-steam heat exchanger is communicated with a gasification synthesis gas outlet of the gasification furnace, and a second inlet of the synthesis gas-steam heat exchanger is communicated with a steam outlet of the methanation unit, so that the synthesis gas output by the gasification furnace and the steam of the methanation unit exchange heat and cool;
a first outlet of the synthesis gas-steam heat exchanger is communicated with a gasification steam inlet of the gasification furnace and used for conveying the steam after heat exchange to the gasification furnace; and a second outlet of the synthesis gas-steam heat exchanger is communicated with the synthesis gas purification device and used for conveying the synthesis gas after heat exchange to the synthesis gas purification device.
Further, in the above renewable energy power to gas conversion system coupled with biomass gasification, the biomass gasification unit further includes: a water gas shift device; wherein the content of the first and second substances,
the inlet of the water gas shift device is communicated with the gasified synthetic gas outlet of the gasification furnace and is used for converting CO in the gasified synthetic gas into CO2And H2。
Further, in the above coupled biomass gasification renewable energy power-to-gas system, the gasified syngas outlet of the biomass gasification unit is further communicated with the combustion gas inlet of the non-renewable energy power generation unit in the power generation system, so as to deliver part of the gasified syngas into the non-renewable energy power generation unit to be converted into electric energy, thereby providing electric energy for the water electrolysis hydrogen production unit or supplying the electric energy to the power grid
Further, in the above renewable energy power-to-gas system coupled with biomass gasification, the non-renewable energy power generation unit is a gas turbine power generation system, a gas-steam combined cycle system, or a fuel cell power generation system.
Further, in the above renewable energy electric gas conversion system coupled with biomass gasification, the methane outlet of the methanation unit is communicated with a natural gas pipe network so as to convey the prepared methane product to the natural gas pipe network.
Further, in the above renewable energy power to gas conversion system coupled with biomass gasification, the methanation unit includes: a plurality of reaction units, a plurality of heat exchange units and a gas-liquid separation device which are communicated with each other; wherein the content of the first and second substances,
a raw material gas inlet on the head part of the reaction unit is communicated with a hydrogen outlet of the water electrolysis hydrogen production unit and a gasified synthesis gas outlet of the biomass gasification unit;
the heat exchange units are connected between any two adjacent reaction units and between the tail reaction unit and the gas-liquid separation device, so that water separated by the gas-liquid separation device sequentially passes through the heat exchange units from the tail part to the head part to exchange heat with synthesis gas generated by the corresponding reaction unit, and a first outlet of the heat exchange unit at the head part is communicated with a vaporization steam inlet of the biomass gasification unit.
Further, in the above renewable energy power to gas conversion system coupled with biomass gasification, the reaction unit includes: the system comprises a first-stage methane reactor, a second-stage methane reactor and a third-stage methane reactor which are sequentially connected in series from upstream to downstream; wherein the content of the first and second substances,
the biomass gasification device is characterized in that a raw gas inlet of the first-stage methane reactor is communicated with a synthesis gas outlet of the biomass gasification unit, a first-stage synthesis gas-water heat exchanger is arranged between an outlet of the first-stage methane reactor and an inlet of the second-stage methane reactor, a second-stage synthesis gas-water heat exchanger is arranged between an outlet of the second-stage methane reactor and an inlet of the third-stage methane reactor, and a third-stage synthesis gas-water heat exchanger is arranged between an outlet of the third-stage methane reactor and the gas-liquid separation device.
Preferably, in the above renewable energy power conversion gas system coupled with biomass gasification, the methanation unit further comprises: a recycle gas compressor; wherein the content of the first and second substances,
and the inlet of the circulating gas compressor is communicated with the second outlet of the heat exchange unit positioned at the head, and the outlet of the circulating gas compressor is communicated with the inlet of the reaction unit positioned at the head, so that the gas which is not converted into methane in the reaction unit is conveyed to the reaction unit positioned at the head again.
The biomass gasification coupled renewable energy power-to-gas system provided by the invention has the following beneficial effects:
(1) in the methanation unit of electricity-to-gas, CO/CO is adopted2By methanation of the same system, i.e. using H2And CO, CO2Preparation of C by joint reactionH4And conventional CO capture2Compared with the reuse mode, the method saves CO2The energy consumption in the separation process is reduced, and the corresponding operation cost is reduced;
(2) by-product O of electrolysis process2The gasification agent is used for biomass gasification, so that the effective recovery and cyclic utilization of intermediate products are realized;
(3) the heat energy of the high-temperature synthesis gas of the biomass gasification unit and the heat energy released by the methanation unit are recycled and converted into high-grade high-value hydrogen and methane through a chemical process, so that the conversion from low-grade physical energy to high-grade chemical energy is realized;
(4) the biomass energy is utilized to provide additional hydrogen sources and carbon sources for the electricity-to-gas process, so that the consumption of traditional fossil energy sources for providing the carbon sources is avoided, zero carbon emission in the whole life cycle is really realized, and meanwhile, a new way is provided for realizing the efficient utilization of renewable energy sources, reducing the abandoned wind and abandoned light and improving the consumption level of new energy sources.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of a renewable energy power-to-gas system coupled with biomass gasification according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a renewable energy power-to-gas system coupled with biomass gasification according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, a biomass gasification coupled renewable energy power to gas system according to an embodiment of the present invention includes: the system comprises an electrolytic water hydrogen production unit 1, a biomass gasification unit 2 and a methanation unit 3; the energy input end of the water electrolysis hydrogen production unit 1 is communicated with the energy output end of the power generation system and is used for electrolyzing water under the supply of electric energy output by the power generation system; an external water source and a steam outlet of the methanation unit 3 are respectively communicated with a raw material input end of the electrolytic water hydrogen production unit 1; the biomass gasification unit 2 is provided with a biomass inlet for communicating with an external biomass source; an oxygen inlet of the biomass gasification unit 2 is communicated with an oxygen outlet of the electrolyzed water hydrogen production unit 1, a steam outlet of the methanation unit 3 is communicated with a gasification steam inlet of the biomass gasification unit 2, and the methanation unit is used for transmitting steam to the biomass gasification unit 2 and simultaneously transmitting partial heat energy required by the biomass gasification unit; the raw gas inlet of the methanation unit 3 is respectively communicated with the hydrogen outlet of the electrolyzed water hydrogen production unit 1 and the gasified synthesis gas outlet of the biomass gasification unit 2 so as to utilize H2And CO, CO2Preparation of CH by joint reaction4And by-product steam; and a methane outlet of the methanation unit 3 is communicated with a natural gas pipe network so as to convey the prepared methane product to the natural gas pipe network.
Specifically, the reaction mainly performed in the hydrogen production unit 1 by electrolyzing water is 2H2O→2H2+O2(ii) a The reaction mainly carried out in the methanation unit 3 is CO2+4H2→CH4+2H2O; the biomass gasification unit 2 mainly carries out the process of preparing the H from biomass, oxygen and water or steam as gasification raw materials2CO and CO2The main gasification syngas.
In this embodiment, the raw material water or steam of the hydrogen production unit 1 by water electrolysis may be from two parts: a part of water or steam from the methanation unit 3, which part of water or steam may carry heat energy generated by the methanation process; the other part is an externally introduced water source which can recover the heat energy in the hydrogen and oxygen by exchanging heat with the electrolysis products of the hydrogen and oxygen. Because water or steam produced in the methanation unit 3 can carry partial heat, an external water source can also carry partial heat after heat exchange, two strands of water or steam are mixed and then enter the electrolyzed water hydrogen production unit 1 to provide a heat source for the water electrolysis process, electric energy produced by the power generation system provides a power supply for the water electrolysis process, the water electrolysis process is driven to be carried out smoothly in the electrolysis device together, wherein the power generation system can utilize renewable energy sources such as wind and light as raw materials to produce electric energy, and can also use gas, steam and the like as raw materials to produce electric energy. Namely: the electricity generating system may include: the power generation unit of renewable energy sources and the power generation unit of non-renewable energy sources.
Referring to fig. 2, the water electrolysis hydrogen production unit 1 includes: an electrolysis device 11, a hydrogen compressor 14, an oxygen compressor 15 and an oxygen storage tank 16; wherein, the inlet of the electrolysis device 11 is communicated with an external water source and the steam outlet of the methanation unit 3, and is used for generating H by utilizing the electrolysis process of water or steam under the driving of electric energy and heat energy2And O2(ii) a A hydrogen outlet of the electrolysis device 11 is communicated with an inlet of the hydrogen compressor 14, and an outlet of the hydrogen compressor 14 is communicated with a raw gas inlet of the methanation unit 3, so as to pressurize the hydrogen output by the electrolysis device 11 and then convey the hydrogen to the methanation unit 3; the oxygen outlet of the electrolysis device 11 is communicated with the inlet of the oxygen compressor 15, and the outlet of the oxygen compressor 15 is communicated with the inlet of the oxygen storage tank 16, so as to pressurize the oxygen output by the electrolysis device 11 and then convey the oxygen to the oxygen storage tank 16; a first outlet of the oxygen storage tank 16 is in communication with an oxygen inlet of the biomass gasification unit 2 for providing oxygen to the biomass gasification unit 2, and a second outlet of the oxygen storage tank 16 is for outputting a portion of the oxygen as a product.
Specifically, the electrolyzer 11 is a high-temperature solid oxide high-temperature electrolyzer 11, an alkaline solution electrolyzer 11, and a mediumA proton exchange membrane electrolyzer 11 or a high temperature solid oxide high temperature electrolyzer 11. Taking the solid oxide electrolyzer 11 as an example, the electrolyzer is composed of a cathode electrode and an anode electrode with porous two sides and a dense electrolyte layer in the middle, the electrolysis temperature is 873-1473K, the current density is 500-7000A/m2At the cathode of the electrolysis apparatus, H is fed2O as raw material for electrolysis while supplying a small amount of H2，H2The cathode is protected from oxidation as a reducing atmosphere. Cathode stream H260-90% of O and H2The volume fraction of the compound is 10-40%; at the anode of the electrolysis apparatus with circulating O2As a carrier gas (sweep gas) for the electrolytically produced O2Bringing into the next pass, the purge gas may also contain N2Etc., anode stream: o is2The volume fraction of (A) is 20-100%.
The inlet of the oxygen storage tank 16 is communicated with the outlet of the oxygen compressor 15 to store the oxygen generated by the water electrolysis hydrogen production unit 1, the first outlet of the oxygen storage tank 16 is communicated with the oxygen inlet of the biomass gasification unit 2 to convey part of the oxygen into the biomass gasification unit 2 to participate in the gasification process, and the rest part of the oxygen in the oxygen storage tank 16 can be conveyed to the outside as a product through the second outlet of the oxygen storage tank 16, so that the comprehensive utilization rate of the product oxygen is improved.
With continued reference to fig. 2, preferably, the water electrolysis hydrogen production unit 1 further includes: a hydrogen-water heat exchanger 12 and an oxygen-water heat exchanger 13; wherein, two inlets of the oxygen-water heat exchanger 13 are respectively communicated with the oxygen outlet of the electrolysis device 11 and the external water source, so as to enable the oxygen generated in the electrolysis device 11 to exchange heat with the external water source, thereby recovering oxygen sensible heat by using the external water source; two inlets of the hydrogen-water heat exchanger 12 are respectively communicated with the hydrogen outlet of the electrolysis device 11 and the external water source, so that the hydrogen generated in the electrolysis device 11 exchanges heat with the external water source, and the sensible heat of the hydrogen is recovered by using the external water source.
Specifically, an external water source carries out primary heat exchange with the product oxygen of the water electrolysis hydrogen production unit 1 through an oxygen-water heat exchanger 13 so as to convey part of heat carried by the external water source into the water electrolysis hydrogen production unit 1; two inlets of the hydrogen-water heat exchanger 12 are respectively communicated with a hydrogen outlet of the electrolysis device 11 and a first outlet of the oxygen-water heat exchanger 13, so that the hydrogen generated in the electrolysis device 11 and the external water source perform secondary heat exchange, and sensible heat is fully released to the external water source; a first outlet of the hydrogen-water heat exchanger 12 may be communicated with a raw gas inlet of the methanation unit 3 through a hydrogen compressor 14; and a second outlet of the hydrogen-water heat exchanger 12 is communicated with a raw material input end of the water electrolysis hydrogen production unit 1 so as to convey the heat-exchanged water to the water electrolysis hydrogen production unit 1 through a pipeline for electrolytic reaction. A first outlet of the oxygen-water heat exchanger 13 is in communication with one inlet of the hydrogen-water heat exchanger 12, and a second outlet of the oxygen-water heat exchanger 13 may be in communication with an oxygen storage tank 16 via an oxygen compressor 15.
In this embodiment, an external water source sequentially passes through the oxygen-water heat exchanger 13 and the hydrogen-water heat exchanger 12 to exchange heat with the electrolysis product oxygen and hydrogen respectively, so as to absorb sensible heat in the hydrogen and the oxygen, then enter the raw material input end of the hydrogen production unit 1 through electrolysis, and then is conveyed to the hydrogen production unit 1 through the raw material input end of the hydrogen production unit 1 to provide electrolysis raw material water or steam, and meanwhile, partial heat energy is provided for the hydrogen production unit 1 through electrolysis.
The biomass gasification unit 2 includes: a gasification furnace 21 and a synthesis gas purification device 23; the gasification furnace 21 is respectively provided with a biomass inlet, an oxygen inlet and a gasification steam inlet, and is used for being respectively communicated with an external biomass source, an oxygen outlet of the electrolyzed water hydrogen production unit 1 and a steam outlet of the methanation unit 3; an inlet of the synthesis gas purification device 23 is communicated with a gasified synthesis gas outlet of the gasification furnace 21 to remove impurities in the synthesis gas, and a purified synthesis gas outlet of the synthesis gas purification device 23 is communicated with a raw gas inlet of the methanation unit 3.
Specifically, the gasification furnace 21 may be a fixed bed, a circulating fluidized bed, or an entrained flow bed. The working temperature of the gasification furnace 21 is 700-1400 ℃, and the gasification reaction is carried out under the condition of normal pressure or pressurization (0.1-6 Mpa). In the embodiment, the gasification pressure in the gasification furnace 21 is 0.1-6 Mpa, the gasification temperature is 973-1573K, the mass ratio of steam to biomass is 0.2-1, the mass ratio of oxygen to biomass is 0.1-0.5, and the heat dissipation loss is controlled to be 1-10%.
The raw material in the biomass gasification unit 2 can be at least one of firewood, wood waste, agricultural straw, livestock manure, sugar crop waste residue, municipal waste and sewage, and aquatic plants, or can also be a mixture of at least two materials of biomass, coal and high polymer solid waste. Because biomass is the only renewable carbon source, the electricity-to-gas system of the embodiment of the invention realizes zero carbon emission in the whole life cycle, and simultaneously provides a new way for realizing the high-efficiency utilization of renewable energy, reducing wind and light abandonment and improving the consumption level of new energy.
The oxygen inlet of the gasifier 21 may also be in communication with a source of air gasifying agent, which may contain O2，Ar，N2And some other purge gas thereof. The gasification steam inlet of the gasifier 21 may also be in communication with other industrial projects or external water sources to provide a source of steam for the gasification of biomass. An oxygen inlet on the gasification furnace 21 is communicated with an outlet of the oxygen storage tank 16 in the hydrogen production unit 1 by electrolyzing water, and a gasification steam inlet on the gasification furnace is communicated with a steam outlet of the methanation unit 3, so that steam in the methanation unit 3 is used as a gasification agent to participate in biomass gasification reaction, and the cyclic utilization of materials is realized.
An inlet of the syngas purifying device 23 communicates with the gasified syngas outlet of the gasification furnace 21 to purify dust, acid gas (SOx, NOx) and other impurities in the high-temperature gasified syngas generated in the gasification furnace 21 to obtain a clean purified syngas (H)2、CO、CO2As the main component) to be mixed with the hydrogen of the hydrogen production unit 1 by electrolyzing water from the incoming gas and then to be conveyed to the methanation unit 3 together for CO/CO2Carrying out methanation reaction on the same system.
Further, in this embodiment, the biomass gasification unit 2 further includes: a syngas-steam heat exchanger 22; a first inlet of the synthesis gas-steam heat exchanger 22 is communicated with a gasified synthesis gas outlet of the gasification furnace 21, and a second inlet of the synthesis gas-steam heat exchanger 22 is communicated with a steam outlet of the methanation unit 3, so that the synthesis gas output by the gasification furnace 21 and the steam of the methanation unit 3 exchange heat and are cooled; a first outlet of the synthesis gas-steam heat exchanger 22 is communicated with a gasification steam inlet of the gasification furnace 21, and is used for conveying the steam subjected to heat exchange to the gasification furnace 21; a second outlet of the synthesis gas-steam heat exchanger 22 is communicated with the synthesis gas purification device 23, and is used for conveying the synthesis gas after heat exchange to the synthesis gas purification device 23.
Specifically, the second inlet of the syngas-steam heat exchanger 22 is communicated with the steam outlet of the methanation unit 3, so that the high-temperature syngas output from the gasification furnace 21 exchanges heat with the steam generated by the methanation unit 3, the high-temperature syngas is sent to the syngas purification device 23 through a pipeline for purification after the temperature of the high-temperature syngas is reduced, and the heated steam is sent to the gasification furnace 21 to realize the recycling of the methanation by-products. In this embodiment, the first outlet of the syngas-steam heat exchanger 22 may also be communicated with the raw material inlet of the hydrogen production unit 1 by water electrolysis to provide raw material water or steam and heat energy for the hydrogen production unit 1 by water electrolysis. In order to avoid slag formation in the gasification furnace 21 in a large area or blockage of the gasification furnace outlet due to ash generated by biomass combustion, an ash treatment device may be disposed between the gasification syngas outlet of the gasification furnace 21 and the inlet of the syngas purification device 23, so as to treat the ash generated by biomass combustion in time and maintain normal and stable operation of the equipment. In the embodiment of the invention, the intermediate heat energy generated by the biomass gasification unit 2 and the methanation unit 3 can also be utilized by other ways, such as industrial process, heating for residents and CO2Trapping, use in other various thermal management techniques, and the like.
In this embodiment, a water pump (not shown in the figure) and a plurality of heat exchangers are further disposed in the biomass gasification unit 2, wherein an inlet of the water pump is communicated with an external water source or a byproduct water outlet of the methanation unit so as to pressurize the water conveyed by the external water source or the methanation unit; each heat exchanger can be connected in series between the gasification synthetic gas outlet of the gasification furnace 21 and the steam inlet of the gasification furnace 21, and the heat exchanger at the head end is communicated with the water outlet of the water pump, so that water conveyed by an external water source or the methanation unit can fully exchange heat with the high-temperature gasification synthetic gas in sequence. In this embodiment, the water pump pressurizes the water delivered from the external water source or the methanation unit, and further delivers the water into the gasification furnace 21 after being heated to steam by the heat exchangers, thereby expanding the source of the steam gasification agent.
Further, the biomass gasification unit 2 may further include: a water gas shift device (not shown in the drawings), an inlet of which communicates with a gasified syngas outlet of the gasification furnace 21, for utilizing a reaction: CO + H2O=CO2+H2Converting CO in the gasified syngas to CO2While lifting H2Content of (b) converting the gasified syngas to CO2And H2Mainly so as to make the downstream methanation unit 3 fully perform CO2In the methanation process.
In order to fully utilize the gasified syngas generated by the biomass gasification unit, the gasified syngas outlet of the biomass gasification unit 2 may also be communicated with a combustion gas inlet of a non-renewable energy power generation unit in a power generation system, so as to convey part of the gasified syngas generated by the biomass gasification unit 2 to the power generation unit for converting into electric energy. The non-renewable energy power generation unit is as follows: a gas turbine power generation system, a gas-steam combined cycle power generation system, or a fuel cell power generation system.
In specific implementation, a branch pipeline may be connected to the purified syngas outlet of the syngas purification apparatus 23, and the branch pipeline is communicated with the fuel inlet of the gas turbine power generation system, the gas-steam combined cycle power generation system, or the fuel cell power generation system, and generates part of the electric energy through combustion or electrochemical reaction, so as to provide the electric energy for the hydrogen production unit by electrolyzing water or supply the electric energy to the power grid.
In this embodiment, the methanation unit 3 includes: a plurality of reaction units, a plurality of heat exchange units and a gas-liquid separation device 38 which are communicated with each other; wherein, a raw material gas inlet on the head part of the reaction unit is communicated with a hydrogen outlet of the water electrolysis hydrogen production unit 1 and a gasification synthesis gas outlet of the biomass gasification unit 2; the heat exchange units are connected between any two adjacent reaction units and between the tail reaction unit and the gas-liquid separation device 38, so that the water separated by the gas-liquid separation device 38 sequentially passes through each heat exchange unit from the tail to the head to exchange heat with the synthesis gas generated by the corresponding reaction unit, and the first outlet of the head heat exchange unit is communicated with the vaporization steam inlet of the biomass gasification unit 2.
Specifically, the reaction units may be connected in series, in parallel, or in a mixture of series and parallel. Each reactor may be a high temperature reactor or a low temperature reactor. The gas-liquid separation device 38 is communicated with a product outlet of the most downstream reaction unit, a first outlet of the gas-liquid separation device 38 is communicated with a heat exchange unit at the tail part, so that separated water is conveyed into the heat exchange unit to exchange heat with the synthesis gas output by the reaction unit at the tail part, so that the water is converted into steam, and finally the steam is conveyed into the electrolyzed water hydrogen production unit 1 and the biomass gasification unit 2 through the first outlet of the heat exchange unit at the head part; by-product H of methanation unit2O is used as one of gasifying agents for biomass gasification, and part of O is circulated back to the electrolysis process for water electrolysis hydrogen production, thereby being beneficial to realizing effective recovery and cyclic utilization of intermediate products; a second outlet of the gas-liquid separation device 38 communicates with an external natural gas pipeline network to deliver the methane product to the natural gas pipeline network.
Since the conversion rate of the first reaction is too high, too many undesired by-products are obtained, and therefore, the conversion rate of the first reaction can be controlled to a low level, and the unreacted raw material is recycled to the reactor after the product is separated, and then the reaction is carried out, in this embodiment, it is preferable that the reaction unit includes: a first stage methane reactor 31, a second stage methane reactor 34 and a third stage methane reactor 36 which are connected in series from upstream to downstream; the raw material gas inlet of the first-stage methane reactor 31 is communicated with the synthesis gas outlet of the biomass gasification unit 2, a first-stage synthesis gas-water heat exchanger 33 is arranged between the outlet of the first-stage methane reactor 31 and the inlet of the second-stage methane reactor 34, a second-stage synthesis gas-water heat exchanger 35 is arranged between the outlet of the second-stage methane reactor 34 and the inlet of the third-stage methane reactor 36, and a third-stage synthesis gas-water heat exchanger 37 is arranged between the outlet of the third-stage methane reactor 36 and the gas-liquid separation device 38.
Specifically, the outlet of the first stage methane reactor 31 is communicated with the first inlet of the first stage synthesis gas-water heat exchanger 33, the second outlet of the first stage synthesis gas-water heat exchanger 33 is communicated with the inlet of the second stage methane synthesis gas, the outlet of the second stage methane synthesis gas is communicated with the first inlet of the second stage synthesis gas-water heat exchanger 35, the first outlet of the second stage synthesis gas-water heat exchanger 35 is communicated with the inlet of the third stage methane reactor 36, the second outlet of the second stage synthesis gas-water heat exchanger 35 is communicated with the second inlet of the first stage synthesis gas-water heat exchanger 33, the outlet of the third stage methane reactor 36 is communicated with the first inlet of the third stage synthesis gas-water heat exchanger 37, the first outlet of the third stage synthesis gas-water heat exchanger 37 is communicated with the inlet of the gas-liquid separation device 38, the second outlet of the third stage synthesis gas-water heat exchanger 37 is communicated with the second inlet of the second stage synthesis gas-water heat exchanger 35, a second inlet of the three-stage syngas-water heat exchanger 37 communicates with a water outlet of the gas-liquid separator 38.
With continued reference to fig. 2, the methanation unit 3 may further include: a recycle gas compressor 32; wherein, the inlet of the recycle gas compressor 32 is communicated with the second outlet of the heat exchange unit located at the head, and the outlet of the recycle gas compressor 32 is communicated with the inlet of the reaction unit located at the head, so as to convey the gas which is not converted into methane in the reaction unit to the reaction unit located at the head again.
Specifically, an inlet of the recycle gas compressor 32 is communicated with a first outlet of the primary synthesis gas-water heat exchanger 33 downstream of the first stage methane reactor 31 to recover the gas that is not completely converted into methane, and an outlet of the recycle gas compressor 32 is communicated with a recycle gas inlet of the first stage methane reactor 31 to deliver the recovered gas to the first stage methane reactor 31 for methanation. The recycle gas inlet of the first stage methane reactor 31 may be disposed at the bottom of the first stage methane reactor 31 and the feed gas inlet of the first stage methane reactor 31 may be disposed at the top of the first stage methane reactor 31.
In particular, the first stage methane reactor 31, the second stage methane reactor 34, and the third stage methane reactor 36. The reaction pressure in each stage of methane reactor is 1-4 Mpa, the circulation ratio is 3-4, and the circulation ratio is the ratio of the amount of the circulating raw material flowing out from the outlet of the first stage methane reactor 31 to the amount of the raw material converted in the first reaction. The inlet temperature of the first-stage methane reactor 31 is 473-673K, the outlet temperature of the first-stage methane reactor 31 is 773-973K, the inlet temperature of the second-stage methane reactor 34 is 473-673K, the outlet temperature of the second-stage methane reactor 34 is 700-900K, the inlet temperature of the third-stage methane reactor 36 is 373-573K, the outlet temperature of the third-stage methane reactor 36 is 473-673K, after the third-stage methane reactor, the separated methane needs to be further compressed and then is conveyed to a natural gas pipe network through a pipeline, namely the compression pressure of the natural gas is 6-10 MPa.
The process of the methanation unit 3 is as follows: a raw gas inlet of the first-stage methane reactor 31 is communicated with a purified synthesis gas outlet of a synthesis gas purification device 23 of the biomass gasification unit 2, clean gasified synthesis gas (mainly hydrogen, carbon monoxide and carbon dioxide) is mixed with hydrogen from a hydrogen compressor 14, the molar ratio of H2/(CO + CO2) can be adjusted to 3-4, the mixture is sent into the first-stage methane reactor 31 for adiabatic reaction, high-temperature gas at the outlet is sent into a first-stage synthesis gas-water heat exchanger 33, and sensible heat physical energy is recovered by water (steam) from a second-stage synthesis gas-water heat exchanger 35; after passing through the first-stage synthesis gas-water heat exchanger 33, part of the gas which is not converted into methane is circularly sent back to the inlet of the first-stage methane reactor 31 by a recycle gas compressor so as to keep the temperature of the reactor below 700 ℃ and prevent the catalyst from being deactivated; another part of the synthesis gas (comprising methane, and part of the unconverted methane gas, CO, H2) Enters a second-stage methane reactor 34 to continue the reaction, and the outlet gas is sent to a second-stage synthesis gas-water heat exchanger 35 to be supplied fromThe water (steam) of the three stage syngas-water heat exchanger 37 recovers sensible physical energy. The synthesis gas at the outlet of the second synthesis gas-water heat exchanger 35 is sent to a third-stage methane reactor 36, and the rest synthesis gas is fully converted. The outlet gas from the third stage methane reactor 36 is fed to a three stage syngas-water heat exchanger 37 where sensible physical energy is recovered by water from a gas-liquid separation device 38. And finally, the gas at the outlet of the three-stage synthesis gas-water heat exchanger 37 is sent to a gas-liquid separation device 38, the methane and the water in the product are separated, the product methane can be compressed to be more than 6 MPa and sent to a natural gas pipe network for conveying, the product water can be recycled, the heat energy in the methanation process is recovered and converted into chemical energy, and therefore the heat energy grade is improved.
It should be noted that in the embodiment of the present invention, the primary syngas mainly contains a large amount of CO and H2Small amounts of methane and steam; the secondary synthetic gas mainly contains methane, steam, and small amount of CO and H2(ii) a The tertiary syngas is primarily methane and steam.
It can be seen that the byproduct water of the methanation unit 3 is purified, then passes through the three-stage synthesis gas-water heat exchanger 37, the two-stage synthesis gas-water heat exchanger 35 and the one-stage synthesis gas-water heat exchanger 33, the intermediate heat energy of the methanation unit 3 is fully recovered, the intermediate heat energy is further heated to form steam, part of the steam passes through the high-temperature synthesis gas steam heat exchanger, the sensible heat physical energy of the high-temperature gasification synthesis gas is recovered, and the steam enters the biomass gasification unit 2 to be used as a gasification agent for gasification reaction.
The energy conversion efficiency calculation table of the renewable energy electric-to-gas system coupled with biomass gasification in the embodiment is calculated as follows:
| energy flow, kW | |
| Water electrolysis hydrogen production unit | |
| Power consumption of electrolyzer | 43195.13 |
| Power consumption of hydrogen compressor | 3103.5 |
| Biomass gasification unit | |
| Inputting biomass low heating value | 63532 |
| Power consumption of water pump | 7.51 |
| Power consumption of oxygen compressor | 181.6 |
| Methanation unit | |
| Power consumption of circulating gas compressor | 96.24 |
| Power consumption of natural gas compressor | 240.47 |
| Total up to | 110356.4 |
| Energy flow output | |
| Low calorific value of natural gas | 85414.92 |
| Efficiency of energy conversion% | 77.40 |
The energy conversion efficiency comparison results of the electric gas conversion system and the natural gas preparation system in the prior art are as follows:
| natural gas preparation method | Conventional electric gas conversion method | Biomass gas production | Electric gas conversion method in embodiment of the invention |
| Overall energy conversion efficiency | 45~60% | 53~60% | 77.4% |
It can be seen that the electric gas conversion system in the embodiment of the invention can significantly improve the overall energy efficiency of the electric gas conversion process, the overall energy efficiency can reach more than 75%, and the overall energy efficiency is improved by more than 10% compared with the conventional electric gas conversion method.
In summary, the renewable energy electric gas conversion system coupled with biomass gasification provided by the invention conveys the hydrogen source and the carbon source gas generated by the biomass gasification unit and the hydrogen generated by the water electrolysis hydrogen production unit into the methanation unit together for CO/CO2The methanation process of the same system is the same as that of the prior art for trapping CO firstly2And the mode of utilizing the carbon dioxide saves CO2Energy consumption in the separation process; meanwhile, the water electrolysis hydrogen production unit can provide pure oxygen as a gasifying agent for the biomass gasification unit, and the byproduct water generated in the methanation unit can be recycled and used as a raw material in the biomass gasification and water electrolysis hydrogen production processes; a large amount of heat energy released by chemical reaction in the methanation unit and the heat energy of the high-temperature synthesis gas generated in the biomass gasification unit can be conveyed to the hydrogen production by electrolyzing water and/or the biomass gasification process, so that the deep interactive utilization of materials and energy is realized, the low-grade heat energy is improved into high-grade chemical energy, the energy conversion efficiency of the whole electricity-to-gas conversion can be obviously improved, and the new energy consumption level is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (13)
1. A renewable energy electric-to-gas system coupled with biomass gasification, comprising: the system comprises a water electrolysis hydrogen production unit, a biomass gasification unit and a methanation unit; wherein the content of the first and second substances,
the energy input end of the water electrolysis hydrogen production unit is communicated with the energy output end of the power generation system and is used for electrolyzing water under the supply of electric energy output by the power generation system; an external water source and a steam outlet of the methanation unit are respectively communicated with a raw material input end of the water electrolysis hydrogen production unit and used for transmitting water or steam to the water electrolysis hydrogen production unit and transmitting heat energy required by the water electrolysis hydrogen production unit;
the biomass gasification unit is provided with a biomass inlet for communicating with an external biomass source;
an oxygen inlet of the biomass gasification unit is communicated with an oxygen outlet of the electrolyzed water hydrogen production unit, a steam outlet of the methane unit is communicated with a gasification steam inlet of the biomass gasification unit, and the methane unit is used for transmitting steam to the biomass gasification unit and simultaneously transmitting partial heat energy required by the biomass gasification unit;
the raw gas inlet of the methanation unit is respectively communicated with the hydrogen outlet of the electrolyzed water hydrogen production unit and the gasified synthesis gas outlet of the biomass gasification unit so as to utilize H2And CO, CO2Preparation of CH by joint reaction4。
2. The biomass gasification coupled renewable energy power to gas system of claim 1, wherein the electrolytic water hydrogen production unit comprises: the device comprises an electrolysis device, a hydrogen compressor, an oxygen compressor and an oxygen storage tank; wherein the content of the first and second substances,
the inlet of the electrolysis device is communicated with an external water source and the steam outlet of the methanation unit and is used for generating H by utilizing the electrolysis process of water or steam under the driving of electric energy and heat energy2And O2；
A hydrogen outlet of the electrolysis device is communicated with an inlet of the hydrogen compressor, and an outlet of the hydrogen compressor is communicated with a raw gas inlet of the methanation unit, so that the hydrogen output by the electrolysis device is pressurized and then is conveyed to the methanation unit;
an oxygen outlet of the electrolysis device is communicated with an inlet of the oxygen compressor, and an outlet of the oxygen compressor is communicated with an inlet of the oxygen storage tank, so that oxygen output by the electrolysis device is pressurized and then conveyed to the oxygen storage tank; the first outlet of the oxygen storage tank is communicated with the oxygen inlet of the biomass gasification unit and used for providing oxygen for the biomass gasification unit, and the second outlet of the oxygen storage tank is used for outputting partial oxygen as a product.
3. The biomass gasification coupled renewable energy power to gas system of claim 2, wherein the electrolytic water hydrogen production unit further comprises: hydrogen-water heat exchangers and oxygen-water heat exchangers; wherein the content of the first and second substances,
two inlets of the oxygen-water heat exchanger are respectively communicated with an oxygen outlet of the electrolysis device and the external water source, so that the oxygen generated in the electrolysis device exchanges heat with the external water source, and the sensible heat of the oxygen is recovered by using the external water source;
two inlets of the hydrogen-water heat exchanger are respectively communicated with a hydrogen outlet of the electrolysis device and the external water source, so that the hydrogen generated in the electrolysis device exchanges heat with the external water source, and the sensible heat of the hydrogen is recovered by utilizing the external water source.
4. The biomass gasification-coupled renewable energy power to gas conversion system of claim 2, wherein the electrolysis device is a high temperature solid oxide high temperature electrolysis device, an alkaline solution electrolysis device, a proton exchange membrane electrolysis device, or a high temperature solid oxide high temperature electrolysis device.
5. The biomass gasification coupled renewable energy power to gas system of claim 1 wherein the biomass gasification unit comprises: a gasification furnace and a synthesis gas purification device; wherein the content of the first and second substances,
the gasification furnace is respectively provided with a biomass inlet, an oxygen inlet and a gasification steam inlet and is respectively communicated with an external biomass source, an oxygen outlet of the electrolyzed water hydrogen production unit and a steam outlet of the methanation unit;
the inlet of the synthetic gas purification device is communicated with the gasified synthetic gas outlet of the gasification furnace and used for removing impurities in the synthetic gas, and the purified synthetic gas outlet of the synthetic gas purification device is communicated with the raw gas inlet of the methanation unit.
6. The biomass gasification coupled renewable energy power to gas system of claim 5 wherein the biomass gasification unit further comprises: a syngas-steam heat exchanger; wherein the content of the first and second substances,
a first inlet of the synthesis gas-steam heat exchanger is communicated with a gasification synthesis gas outlet of the gasification furnace, and a second inlet of the synthesis gas-steam heat exchanger is communicated with a steam outlet of the methanation unit, so that the synthesis gas output by the gasification furnace and the steam of the methanation unit exchange heat and cool;
a first outlet of the synthesis gas-steam heat exchanger is communicated with a gasification steam inlet of the gasification furnace and used for conveying the steam after heat exchange to the gasification furnace; and a second outlet of the synthesis gas-steam heat exchanger is communicated with the synthesis gas purification device and used for conveying the synthesis gas after heat exchange to the synthesis gas purification device.
7. The biomass gasification coupled renewable energy power to gas system of claim 5 wherein the biomass gasification unit further comprises: a water gas shift device; wherein the content of the first and second substances,
the inlet of the water gas shift device is communicated with the gasified synthetic gas outlet of the gasification furnace and is used for converting CO in the gasified synthetic gas into CO2And H2。
8. The biomass gasification-coupled renewable energy power-to-gas system according to claim 1, wherein the gasification syngas outlet of the biomass gasification unit is further communicated with the combustion gas inlet of the non-renewable energy power generation unit in the power generation system, so as to convey part of the gasification syngas into the non-renewable energy power generation unit to be converted into electric energy, thereby providing electric energy for the water electrolysis hydrogen production unit or supplying the electric energy to the power grid.
9. The biomass gasification-coupled renewable energy power to gas system of claim 8, wherein the non-renewable energy power generation unit is a gas turbine power generation system, a gas-steam combined cycle system, or a fuel cell power generation system.
10. The biomass gasification coupled renewable energy power conversion gas system according to claim 1, wherein the methane outlet of the methanation unit is in communication with a natural gas pipeline network to deliver the produced methane product to the natural gas pipeline network.
11. The biomass gasification coupled renewable energy power to gas system of claim 1 wherein the methanation unit comprises: a plurality of reaction units, a plurality of heat exchange units and a gas-liquid separation device which are communicated with each other; wherein the content of the first and second substances,
a raw material gas inlet on the head reaction unit is communicated with a hydrogen outlet of the water electrolysis hydrogen production unit and a gasified synthesis gas outlet of the biomass gasification unit;
the heat exchange units are connected between any two adjacent reaction units and between the tail reaction unit and the gas-liquid separation device, so that water separated by the gas-liquid separation device sequentially passes through the heat exchange units from the tail part to the head part to exchange heat with synthesis gas generated by the corresponding reaction unit, and a first outlet of the heat exchange unit at the head part is communicated with a vaporization steam inlet of the biomass gasification unit.
12. The biomass gasification coupled renewable energy power to gas system of claim 8, wherein the reaction unit comprises: the system comprises a first-stage methane reactor, a second-stage methane reactor and a third-stage methane reactor which are sequentially connected in series from upstream to downstream; wherein the content of the first and second substances,
the biomass gasification device is characterized in that a raw gas inlet of the first-stage methane reactor is communicated with a synthesis gas outlet of the biomass gasification unit, a first-stage synthesis gas-water heat exchanger is arranged between an outlet of the first-stage methane reactor and an inlet of the second-stage methane reactor, a second-stage synthesis gas-water heat exchanger is arranged between an outlet of the second-stage methane reactor and an inlet of the third-stage methane reactor, and a third-stage synthesis gas-water heat exchanger is arranged between an outlet of the third-stage methane reactor and the gas-liquid separation device.
13. The biomass gasification coupled renewable energy power to gas system of claim 8, wherein the methanation unit further comprises: a recycle gas compressor; wherein the content of the first and second substances,
and the inlet of the circulating gas compressor is communicated with the second outlet of the heat exchange unit positioned at the head, and the outlet of the circulating gas compressor is communicated with the inlet of the reaction unit positioned at the head, so that the gas which is not converted into methane in the reaction unit is conveyed to the reaction unit positioned at the head again.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113266438A (en) * | 2021-05-18 | 2021-08-17 | 西安热工研究院有限公司 | Operation control system and method based on high-temperature gas cooled reactor |
| GB2620481A (en) * | 2021-11-18 | 2024-01-10 | Francis Geary Paul | Electrolysis system and method for energy recycling |
| CN114350410A (en) * | 2022-03-14 | 2022-04-15 | 浙江百能科技有限公司 | Low-rank coal poly-generation coupling carbon dioxide capture and hydrogen production system and control method thereof |
| CN116681545A (en) * | 2023-01-30 | 2023-09-01 | 兰州理工大学 | Facility agriculture park near-zero carbon implementation method considering biomass-P2G coupling |
| CN116496141A (en) * | 2023-04-14 | 2023-07-28 | 中国天辰工程有限公司 | Green methanol preparation process and system |
| CN116496141B (en) * | 2023-04-14 | 2024-04-16 | 中国天辰工程有限公司 | Green methanol preparation process and system |
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