CN110357039B - Biogas and solar complementary synthesis gas preparation system and method - Google Patents
Biogas and solar complementary synthesis gas preparation system and method Download PDFInfo
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Abstract
A system and a method for preparing synthesis gas by complementing methane and solar energy are disclosed, the system comprises: the system comprises a biogas purification unit, a wet reforming reactor, a dry reforming reactor, a first heat regenerator, a second heat regenerator, a solar concentrator, a first three-way valve, a second three-way valve and a third three-way valve. The desulfurized biogas is divided into a first part of desulfurized biogas and a second part of desulfurized biogas; the first part of desulfurized biogas passes through a biogas purification unit and then outputs separated carbon dioxide and high-purity methane; mixing high-purity methane and water vapor, preheating, absorbing heat energy converted from solar energy in a wet reforming reactor, and carrying out reforming reaction to generate synthesis gas; and mixing the carbon dioxide with the desulfurized biogas of the second part, heating, absorbing heat energy converted from solar energy in a dry reforming reactor, carrying out reforming reaction, cooling and outputting. The invention promotes the heat energy grade of solar energy to the chemical energy grade of synthesis gas through thermochemical reaction, and increases the thermodynamic performance of the system.
Description
Technical Field
The invention relates to the technical field of solar energy utilization and energy, in particular to a system and a method for preparing synthesis gas by complementary utilization of methane and solar energy, which integrate key unit technologies such as solar heat collection, methane purification, methane conversion and the like.
Background
The biomass resources in China are rich, the biological methane becomes an important way for utilizing the biomass, and the methane generation system in China is used as a foreign mature technology for reference and has developed towards large and medium methane generation systems; however, the utilization technology of the biogas is relatively backward, and the problem of low utilization efficiency of the biogas exists. The complementary utilization of various renewable energy sources has the potential of improving the energy utilization efficiency and the energy supply quality and reducing the energy supply cost, and becomes a hotspot technology in the renewable energy source field.
Other renewable energy sources are introduced as driving reaction heat sources through methane reforming, so that the fuel heat value is improved, and the method is an efficient methane upgrading technical means; meanwhile, two greenhouse gases of methane and carbon dioxide in the biogas are reacted to obtain high-calorific-value synthesis gas, and the method has important significance for relieving greenhouse effect and improving energy supply.
However, due to the particularity of the ratio of methane to carbon dioxide in the biogas, the conversion rate of methane in the reforming reaction of the biogas is low, and the common commercial catalyst is easy to deactivate, so that a catalyst specially made of expensive metal is needed, which is not beneficial to the development and popularization of the technology.
In the traditional biogas purification process for preparing the biological methane, separation equipment with large investment and high energy consumption is required to be arranged to separate and obtain the high-concentration methane meeting the requirements, and simultaneously, the separated carbon dioxide is discharged into the atmosphere, so that the greenhouse effect is intensified.
Disclosure of the invention technical problem to be solved
In view of the above, the main objective of the present invention is to provide a system and a method for preparing synthesis gas by complementary use of biogas and solar energy, so as to solve the problems of low methane conversion rate and easy inactivation of common commercial catalysts in the biogas reforming reaction, and improve the thermal performance of the system.
(II) technical scheme
In order to achieve the above object, according to a first embodiment of the present invention, there is provided a biogas and solar complementary synthesis gas preparation system, comprising: biogas purification unit 1, wet reforming reactor 2, dry reforming reactor 3, first regenerator 4, second regenerator 5, solar concentrator 6, first three-way valve 7, second three-way valve 8, third three-way valve 9, wherein:
the first three-way valve 7 is a gas splitting device having one inlet and two outlets for splitting a gas stream into two gas streams in a certain ratio; the second three-way valve 8 and the third three-way valve 9 are gas mixing devices each having two inlets and one outlet for mixing two gas streams into one gas stream. The biogas purification unit 1 is a biogas separation device for separating carbon dioxide and methane in biogas. The biogas purification unit 1 can separate carbon dioxide and methane in biogas by adopting pressure swing adsorption, temperature swing adsorption, high pressure water washing, organic solvent absorption, chemical absorption, membrane separation, low temperature separation, methane in-situ enrichment method and the like. The first regenerator 4 and the second regenerator 5 are heat exchange devices in which a hot fluid exchanges heat with a cold fluid. The wet reforming reactor 2 and the dry reforming reactor 3 are a solar heat absorbing device and a chemical reaction generating device, and are used for converting solar radiation transmitted by the solar condenser 6 into heat energy as reaction heat of reforming reaction, methane and steam absorb the heat energy in the wet reforming reactor 2 to generate reforming reaction, and methane and carbon dioxide generate reforming reaction in the dry reforming reactor 3. The solar concentrator 6 is used to convert the collected solar energy into heat energy and provide the heat energy to the wet reforming reactor 2 and the dry reforming reactor 3 as an energy source for the reforming reaction to occur.
In order to achieve the above object, the second aspect of the present invention provides a method for preparing syngas by complementing methane and solar energy. The method comprises the steps of splitting desulfurized biogas S1 into a first desulfurized biogas S2 and a second desulfurized biogas S9; after the first part of desulfurized biogas S2 passes through a biogas purification unit 1, separated carbon dioxide S10 and high-purity methane S3 are output; mixing high-purity methane S3 and steam, preheating, and absorbing heat energy in a wet reforming reactor 2 to perform a reforming reaction of the methane and the steam to generate synthesis gas; and mixing the carbon dioxide S10 with the second part of desulfurized biogas S9, heating, absorbing heat energy in the dry reforming reactor 3, generating a reforming reaction of methane and carbon dioxide, generating synthesis gas, cooling and outputting.
(III) advantageous effects
According to the technical scheme, the invention has the following beneficial effects:
1. according to the system and the method for preparing the synthesis gas by complementing the methane and the solar energy, the main fuel input source is renewable energy, the net zero emission of the carbon dioxide can be realized, and the system and the method are environment-friendly and pollution-free.
2. According to the system and the method for preparing the synthetic gas by complementing the methane and the solar energy, provided by the invention, the key unit technologies of solar heat collection, methane reforming and the like are integrated, so that the heat energy grade of the solar energy is improved to the chemical energy grade of the synthetic gas, the thermodynamic performance of the system is increased, meanwhile, discontinuous solar energy which is difficult to store is converted into continuous fuel chemical energy which is easy to store, and the share of the solar energy is higher than that of the conventional method.
3. The system and the method for preparing the synthesis gas with the complementation of the marsh gas and the solar energy provided by the invention can produce high-purity synthesis gasThe heat value synthesis gas has wide application, the synthesis gas generated by the wet reforming reactor can be used for power generation, and the synthesis gas generated by the dry reforming reactor contains H2The mol ratio of the carbon dioxide to CO is close to 1, and the carbon dioxide is an ideal raw material for preparing liquid fuel, synthesizing methanol, dimethyl ether and the like by F-T synthesis.
4. The invention provides a system and a method for preparing synthesis gas with complementary marsh gas and solar energy, wherein H in the synthesis gas generated by a dry reforming reactor2The mol ratio of the carbon dioxide to CO is close to 1, and the carbon dioxide is an ideal raw material for preparing liquid fuel, synthesizing methanol, dimethyl ether and the like by F-T synthesis.
Drawings
FIG. 1 is a schematic diagram of a biogas and solar complementary syngas production system in accordance with an embodiment of the present invention.
FIG. 2 is a flow diagram of a biogas and solar complementary syngas production process according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
As shown in fig. 1, fig. 1 is a schematic diagram of a biogas and solar complementary syngas production system according to an embodiment of the invention, comprising: biogas purification unit 1, wet reforming reactor 2, dry reforming reactor 3, first regenerator 4, second regenerator 5, solar concentrator 6, first three-way valve 7, second three-way valve 8, third three-way valve 9, wherein:
the biogas purification unit 1 is a biogas separation device and is used for separating carbon dioxide and methane in biogas; the first three-way valve 7 is a gas splitting device having one inlet and two outlets for splitting a gas stream into two gas streams in a certain ratio; the second three-way valve 8 and the third three-way valve 9 are gas mixing devices each having two inlets and one outlet for mixing two gas streams into one gas stream; the first heat regenerator 4 and the second heat regenerator 5 are heat exchange equipment, and one hot fluid and one cold fluid exchange heat in the heat exchange equipment; the dry reforming reaction of methane with carbon dioxide takes place inside the dry reforming reactor 3, as well as all other reactions that may take place. The wet reforming reactor 2 and the dry reforming reactor 3 are a solar heat absorbing device and a chemical reaction generating device, and are used for converting solar radiation transmitted by the solar condenser 6 into heat energy as reaction heat of reforming reaction, methane and steam absorb the heat in the wet reforming reactor 2 to generate reforming reaction, and methane and carbon dioxide generate reforming reaction in the dry reforming reactor 3. And a solar concentrator 6 for concentrating and supplying the sunlight to the wet reforming reactor 2 and the dry reforming reactor 3 as an energy source for the reforming reaction to occur.
The desulfurized biogas S1 is introduced into a first outlet of the first three-way valve 7, the first outlet of the first three-way valve 7 is connected with an inlet of the biogas purification unit 1, high-purity methane and carbon dioxide flow out from a first outlet and a second outlet of the biogas purification unit 1 respectively, the first outlet of the biogas purification unit 1 is connected with a first inlet of the second three-way valve 8, and water vapor is introduced into a second inlet of the second three-way valve 8. The outlet of the three-way valve 8 is connected with the cold fluid inlet of the first heat regenerator 4, the cold fluid outlet of the first heat regenerator 4 is connected with the inlet of the wet reforming reactor 2, and the outlet of the wet reforming reactor 2 is connected with the hot fluid inlet of the first heat regenerator 4. The second outlet of the first three-way valve 7 is connected with the second inlet of the third three-way valve 9, and the first inlet of the third three-way valve 9 is connected with the second outlet of the biogas purification unit 1. The outlet of the third three-way valve 9 is connected with the cold fluid inlet of the second regenerator 5, and the cold fluid outlet of the second regenerator 5 is connected with the inlet of the dry reforming reactor 3. The outlet of the dry reforming reactor 3 is connected to the hot fluid inlet of the second regenerator 5. There is an energy transfer between the solar concentrator 6 and the dry reforming reactor 3 and the wet reforming reactor 2.
The biogas purification unit 1 is a biogas separation device for separating carbon dioxide and methane in biogas. The biogas purification unit 1 can adopt pressure swing adsorption, temperature swing adsorption, high pressure water washing, organic solvent absorption, chemical absorption, membrane separation, low temperature separation, methane in-situ enrichment method and the like. The reforming reaction of methane with steam and all other reactions that may occur inside the wet reforming reactor 2. The reactor types include tubular reactors, tower reactors, kettle reactors, reactors with solid particle beds, jet reactors, fixed bed reactors, fluidized bed reactors, and cavity reactors. The dry reforming reaction of methane with carbon dioxide takes place inside the dry reforming reactor 3, as well as all other reactions that may take place. The reactor types include tubular reactors, tower reactors, kettle reactors, reactors with solid particle beds, jet reactors, fixed bed reactors, fluidized bed reactors, and cavity reactors. The first regenerator 4 and the second regenerator 5 are heat exchange devices, the first regenerator 4 may be a wet heat exchanger, and the heat exchange device 5 may be a dry heat exchanger. A hot fluid exchanges heat with a cold fluid inside the apparatus. The solar energy condenser 6 can concentrate sunlight to improve the intensity of solar radiation. The solar condenser 6 can adopt a tower type heat collector or a disc type heat collector. The first three-way valve 7, the second three-way valve 8 and the third three-way valve 9 are valves with three channels, and the size of the valves can be adjusted to control the flow of fluid passing through.
Referring to fig. 1 again to analyze a specific flow, the desulfurized biogas S1 is introduced into the synthesis gas preparation system through an inlet of the first three-way valve 7, and is divided into two parts by the first three-way valve 7 in equal proportion, namely a first part desulfurized biogas S2 and a second part desulfurized biogas S9, the first part desulfurized biogas S2 flows out of a first outlet of the first three-way valve 7 and flows into the biogas purification unit 1, and is separated into high-purity methane S3 and carbon dioxide S10, which respectively flow out of the first outlet and a second outlet of the biogas purification unit 1. High-purity methane S3 flowing out of a first outlet of the biogas purification unit 1 enters a second three-way valve 8 from a first inlet of the second three-way valve 8, and is mixed with water vapor S4 flowing into a second inlet of the second three-way valve 8 in the second three-way valve 8 to obtain mixed gas S5 of the high-purity methane and the water vapor; the mixed gas S5 enters the first heat regenerator 4 through the cold fluid inlet of the first heat regenerator 4 to be heated, the heated mixed gas S6 passes through the cold fluid outlet of the first heat regenerator 4 and the inlet of the wet reforming reactor 2, the heat energy is absorbed in the wet reforming reactor 2 to generate a reforming reaction of methane to generate a synthesis gas S7, and the heat energy required in the reaction process is obtained by converting the solar radiation transmitted by the solar condenser 6 through the wet reforming reactor 2. The synthesis gas S7 is finally cooled in the first heat regenerator 4 and then output. And a second part of desulfurized biogas S9 flows out through the second outlet of the first three-way valve 7 and enters the third three-way valve 9 through the second inlet of the third three-way valve 9, and a mixed gas S11 formed by mixing biogas and carbon dioxide is formed in the third three-way valve 9 and the carbon dioxide gas S10 flowing out of the second outlet of the biogas purification unit 1. The mixed gas S11 flows out from the outlet of the third three-way valve 9 and enters the second heat regenerator 5 through the cold fluid inlet of the second heat regenerator 5 to be heated, the heated mixture S12 enters the dry reforming reactor 3 through the cold fluid outlet of the second heat regenerator 5 and the inlet of the dry reforming reactor 3, the dry reforming reactor 3 absorbs heat energy to perform a reforming reaction of methane and carbon dioxide, and a high-temperature synthesis gas S13 is generated, wherein the heat energy required in the reaction process is obtained by converting solar radiation transmitted from the solar condenser 6 by the dry reforming reactor 3. The synthesis gas S13 is cooled in the second heat regenerator 5 and then output.
Based on the biogas and solar complementary syngas production system shown in fig. 1, fig. 2 shows a flow chart of a biogas and solar complementary syngas production method according to an embodiment of the invention, the method comprising the following steps:
s21, splitting the desulfurized biogas S1 into a first desulfurized biogas S2 and a second desulfurized biogas S9;
the desulfurized biogas S1 is introduced into the synthesis gas preparation system through the inlet of the first three-way valve 7 and is divided into two parts by the first three-way valve 7 in equal proportion, namely a first part of desulfurized biogas S2 and a second part of desulfurized biogas S9.
S22, after the first part of desulfurized biogas S2 passes through the biogas purification unit 1, the separated carbon dioxide S10 and high-purity methane S3 are output;
the first part of desulfurized biogas S2 flows out of the first outlet of the first three-way valve 7 and flows into the biogas purification unit 1, and is separated into high-purity methane S3 and high-purity carbon dioxide S10, which flow out of the first outlet and the second outlet of the biogas purification unit 1 respectively.
S23, mixing high-purity methane S3 with steam, preheating, and absorbing heat energy in a wet reforming reactor 2 to carry out reforming reaction of methane and steam to generate synthesis gas;
high-purity methane S3 flowing out of a first outlet of the biogas purification unit 1 enters a second three-way valve 8 from a first inlet of the second three-way valve 8, and is mixed with water vapor S4 flowing into a second inlet of the second three-way valve 8 in the second three-way valve 8 to obtain mixed gas S5 of the high-purity methane and the water vapor; the mixed gas S5 enters the first heat regenerator 4 through the cold fluid inlet of the first heat regenerator 4 to be heated, the heated mixed gas S6 passes through the cold fluid outlet of the first heat regenerator 4 and the inlet of the wet reforming reactor 2, heat is absorbed in the wet reforming reactor 2 to generate methane, and the wet reforming reaction generates synthesis gas S7, and the heat required in the reaction process is obtained by converting solar radiation transmitted by the solar condenser 6 through the wet reforming reactor 2. The synthesis gas S7 is finally cooled in the first heat regenerator 4 and then output.
S24, mixing the carbon dioxide S10 with the second part of desulfurized biogas S9, heating, absorbing heat energy in the dry reforming reactor 3, generating a reforming reaction of methane and carbon dioxide, generating synthesis gas, cooling and outputting. And a second part of desulfurized biogas S9 flows out through the second outlet of the first three-way valve 7 and enters the third three-way valve 9 through the second inlet of the third three-way valve 9, and a mixed gas S11 formed by mixing biogas and carbon dioxide is formed in the third three-way valve 9 and the carbon dioxide gas S10 flowing out of the second outlet of the biogas purification unit 1. The mixed gas S11 flows out from the outlet of the third three-way valve 9 and enters the second heat regenerator 5 through the cold fluid inlet of the second heat regenerator 5 to be heated, the heated mixture S12 enters the dry reforming reactor 3 through the cold fluid outlet of the second heat regenerator 5 and the inlet of the dry reforming reactor 3, the dry reforming reactor 3 absorbs heat energy to perform a reforming reaction of methane and carbon dioxide, and a high-temperature synthesis gas S13 is generated, and the heat required in the reaction process is obtained by converting the solar radiation transmitted from the solar condenser 6 by the dry reforming reactor 3. The synthesis gas S13 is cooled in the second heat regenerator 5 and then output.
Based on the system and the method for complementary utilization of the methane and the solar energy, provided by the invention, the high-temperature thermochemical unit is integrated, so that the heat energy grade of the solar energy is improved to the chemical energy grade of the synthesis gas, the thermodynamic performance of the system is increased, meanwhile, discontinuous solar energy which is difficult to store is converted into continuous fuel chemical energy which is easy to store, the requirement on a reaction catalyst is lower, the application difficulty of the technology is greatly reduced, and the economical efficiency of the high technology is improved.
Through the simulation calculation of the new system, the following can be known: by adopting the technology, the heat value of the methane is improved by 26.26 percent. If an internal combustion engine is adopted to generate electricity for the methane and the synthesis gas, the generating efficiency is selected according to 40%, and the new system generates 25.22% more electric energy. Because of complementary utilization of solar energy and methane, the heat carried by the smoke in the new system after power generation is more, and the system can be used for refrigeration, heating, heat preservation of the methane tank and the like.
TABLE 1 New System Performance parameters Table
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a complementary syngas preparation system of marsh gas and solar energy, its characterized in that includes marsh gas purification unit (1), wet reforming reactor (2), dry reforming reactor (3), first regenerator (4), second regenerator (5), solar concentrator (6), first three-way valve (7), second three-way valve (8) and third three-way valve (9), wherein:
the biogas purification unit (1) is a biogas separation device and is used for separating carbon dioxide and methane in biogas;
the first three-way valve (7) is a gas splitting device and is provided with an inlet and two outlets, the inlet of the first three-way valve (7) is filled with biogas, one outlet of the first three-way valve (7) is connected with the biogas purification unit (1), and the other outlet is connected with the third three-way valve (9) and is used for splitting the biogas into two gas streams according to a certain proportion;
the second three-way valve (8) and the third three-way valve (9) are gas mixing devices, each having two inlets and one outlet, for mixing two gas streams into one gas stream; wherein the content of the first and second substances,
one inlet of the second three-way valve (8) is connected with the methane purification unit (1) and used for receiving the separated methane, the other inlet is filled with steam to be mixed with the methane, and the outlet of the second three-way valve (8) is connected with the wet reforming reactor (2);
one inlet of a third three-way valve (9) is connected with the first three-way valve (7), the other inlet is connected with the biogas purification unit (1) and is used for receiving and mixing the separated carbon dioxide and a gas material flow of the biogas, and the outlet of the third three-way valve (9) is connected with the dry reforming reactor (3);
the first heat regenerator (4) and the second heat regenerator (5) are heat exchange equipment, and one hot fluid and one cold fluid exchange heat in the heat exchange equipment;
a solar concentrator (6) for concentrating and supplying sunlight to the wet reforming reactor (2) and the dry reforming reactor (3) as an energy source for reforming reaction;
the wet reforming reactor (2) and the dry reforming reactor (3) are a solar heat absorption device and a chemical reaction generation device, are used for converting solar radiation transmitted by the solar condenser (6) into heat energy and are used as reaction heat of reforming reaction, methane and steam absorb the heat in the wet reforming reactor (2) to generate reforming reaction, and methane and carbon dioxide generate reforming reaction in the dry reforming reactor (3).
2. The system for preparing biogas and solar complementary synthesis gas according to claim 1, wherein the biogas purification unit (1) employs pressure swing adsorption, temperature swing adsorption, high pressure water washing, organic solvent absorption, chemical absorption, membrane separation, cryogenic separation or in situ methane enrichment to separate carbon dioxide from methane in the biogas.
3. System for the production of biogas and solar complementary synthesis gas according to claim 1, characterized in that the inlet of the first three-way valve (7) is fed with desulfurized biogas.
4. Biogas and solar complementary syngas production system according to claim 1, characterized in that the first regenerator (4) is a wet heat exchanger and the second regenerator (5) is a dry heat exchanger.
5. Biogas and solar complementary syngas production system according to claim 1, characterized in that the solar concentrator (6) is a single or multiple concentrator.
6. A biogas and solar complementary syngas production method applied to the biogas and solar complementary syngas production system of any one of claims 1 to 5, the method comprising:
splitting the desulfurized biogas (S1) into a first portion of desulfurized biogas (S2) and a second portion of desulfurized biogas (S9);
after the first part of desulfurized biogas (S2) passes through a biogas purification unit (1), outputting separated carbon dioxide (S10) and high-purity methane (S3);
mixing high-purity methane (S3) and steam, preheating, and absorbing heat energy in a wet reforming reactor (2) to carry out reforming reaction of the methane and the steam to generate synthesis gas;
mixing the carbon dioxide (S10) with the second part of desulfurized biogas (S9), heating the mixture, absorbing heat energy in a dry reforming reactor (3), generating a reforming reaction of methane and carbon dioxide, generating synthesis gas, cooling the synthesis gas and outputting the synthesis gas.
7. Process for the production of biogas and solar complementary syngas according to claim 6, characterized in that said splitting of desulfurized biogas (S1) is carried out by means of a first three-way valve (7).
8. The biogas and solar complementary syngas production method according to claim 6, wherein the export of separated carbon dioxide (S10) and high purity methane (S3) after the first partially desulfurized biogas (S2) has passed through the biogas purification unit (1) is achieved by means of the biogas purification unit (1).
9. The biogas and solar complementary syngas production method according to claim 6, wherein the high purity methane (S3) is mixed with steam and preheated, and then the reforming reaction of methane and steam takes place in the wet reforming reactor (2) by absorbing heat energy, to produce syngas, comprising:
high-purity methane (S3) flowing out of a first outlet of the biogas purification unit (1) enters a second three-way valve (8) from a first inlet of the second three-way valve (8), and is mixed with water vapor (S4) flowing in from a second inlet of the second three-way valve (8) in the second three-way valve (8) to obtain mixed gas (S5) of the high-purity methane and the water vapor; mixed gas (S5) enters a first heat regenerator (4) through a cold fluid inlet of the first heat regenerator (4) to be heated, the heated mixed gas (S6) passes through a cold fluid outlet of the first heat regenerator (4) and an inlet of a wet reforming reactor (2), heat energy is absorbed in the wet reforming reactor (2) to generate reforming reaction of methane and water vapor to generate synthesis gas (S7), and the heat energy required in the reaction process is obtained by converting solar radiation transmitted by a solar condenser (6) through the wet reforming reactor (2); the synthesis gas (S7) is finally cooled in the first heat regenerator (4) and then output.
10. The biogas and solar complementary syngas production method according to claim 6, wherein said carbon dioxide (S10) is mixed with a second portion of desulfurized biogas (S9), heated and then absorbed in a dry reforming reactor (3) to perform a reforming reaction, cooled and then output, comprising:
a second part of desulfurized biogas (S9) flows out through a second outlet of the first three-way valve (7) and enters the third three-way valve (9) through a second inlet of the third three-way valve (9), and a mixed gas (S11) formed by mixing the biogas and carbon dioxide is formed in the third three-way valve (9) and the carbon dioxide gas (S10) flowing out of the second outlet of the biogas purification unit (1); the mixed gas (S11) flows out from an outlet of the third three-way valve (9) and enters the second heat regenerator (5) from a cold fluid inlet of the second heat regenerator (5) to be heated, the heated mixture (S12) enters the dry reforming reactor (3) through a cold fluid outlet of the second heat regenerator (5) and an inlet of the dry reforming reactor (3), methane and carbon dioxide absorb heat energy in the dry reforming reactor (3) to carry out reforming reaction to generate high-temperature synthesis gas (S13), the heat energy required in the reaction process is obtained by converting solar radiation transmitted by the solar condenser (6) through the dry reforming reactor (3), and the synthesis gas (S13) is output after being cooled in the second heat regenerator (5).
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