CN110436413B - Biogas and solar complementary two-stage synthesis gas preparation system and method - Google Patents

Biogas and solar complementary two-stage synthesis gas preparation system and method Download PDF

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CN110436413B
CN110436413B CN201910741987.5A CN201910741987A CN110436413B CN 110436413 B CN110436413 B CN 110436413B CN 201910741987 A CN201910741987 A CN 201910741987A CN 110436413 B CN110436413 B CN 110436413B
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reforming reaction
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CN110436413A (en
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韩巍
苏博生
金红光
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Institute of Engineering Thermophysics of CAS
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Abstract

A two-stage synthesis gas preparation system and method with complementary marsh gas and solar energy are disclosed, the system comprises: the system comprises a first three-way valve, a second three-way valve, a primary heat regenerator, a primary reactor, a third three-way valve, a secondary heat regenerator, a secondary reactor and a solar heat collector. Shunting the desulfurized biogas into a first part of desulfurized biogas and a second part of desulfurized biogas; the first part of desulfurized biogas is preheated after being mixed with water vapor, and then the mixture absorbs heat energy converted by solar energy in a primary reactor and carries out reforming reaction to generate a product of the reforming reaction; cooling the product of the reforming reaction, mixing the cooled product with the desulfurized biogas of the second part, preheating the mixture, absorbing the heat energy converted by solar energy in the secondary reactor, carrying out the reforming reaction, cooling and outputting the heat energy. The invention improves the heat energy grade of solar energy to the chemical energy grade of synthesis gas by integrating solar energy heat collection and two-stage methane reforming, reduces the consumption of water and improves the economy of methane and solar energy utilization.

Description

Biogas and solar complementary two-stage synthesis gas preparation system and method
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 methane and solar energy complementary two-section synthesis gas, which integrate key unit technologies such as solar heat collection, methane reforming 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 Invention
Technical problem to be solved
In view of the above, the main objective of the present invention is to provide a two-stage system and a method for preparing syngas by using biogas and solar energy in a complementary manner, 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, a first embodiment of the present invention provides a two-stage synthesis gas preparation system with complementary biogas and solar energy, including: first three-way valve, second three-way valve, one-level regenerator, first order reactor, third three-way valve, second grade regenerator, second order reactor and solar collector, wherein:
a first outlet of the first three-way valve is connected with a first inlet of the second three-way valve, a second inlet of the second three-way valve is communicated with water vapor, an outlet of the second three-way valve is connected with a cold fluid inlet of the primary heat regenerator, a cold fluid outlet of the primary heat exchanger is connected with an inlet of the primary reactor, and an outlet of the primary reactor is connected with a first inlet of the third three-way valve through a hot fluid inlet of the primary heat regenerator;
a second outlet of the first three-way valve is connected with a second inlet of the third three-way valve, an outlet of the third three-way valve is connected with a cold fluid inlet of the secondary heat exchanger, a cold fluid outlet of the secondary heat exchanger is connected with an inlet of the secondary reactor, and an outlet of the secondary reactor is connected with a hot fluid inlet of the secondary heat exchanger;
the solar collector provides energy for the primary reactor and the secondary reactor.
In order to achieve the above object, a two-stage synthesis gas preparation method with complementary biogas and solar energy is provided in the embodiment of the second aspect of the present invention. The method comprises the steps of splitting desulfurized biogas into a first part of desulfurized biogas and a second part of desulfurized biogas; mixing the first part of desulfurized biogas and water vapor, preheating, and absorbing heat energy in a primary reactor to carry out reforming reaction to generate a product of the reforming reaction; cooling the product of the reforming reaction, mixing the cooled product with the desulfurized biogas of the second part, preheating the mixture, absorbing heat energy in a secondary reactor to perform the reforming reaction, and cooling and outputting the product.
(III) advantageous effects
According to the technical scheme, the invention has the following beneficial effects:
1. according to the two-section synthesis gas preparation system and method with complementary biogas and solar energy, provided by the invention, the main fuel input source is renewable energy, so that the net zero emission of carbon dioxide can be realized, and the system and method are environment-friendly and pollution-free. Furthermore, the dependence on water is reduced.
2. According to the two-section synthesis gas preparation system and method with complementary methane and solar energy, provided by the invention, by adopting key unit technologies of integrating solar heat collection, methane reforming and the like, the heat energy grade of solar energy is improved to the chemical energy grade of synthesis gas, the thermodynamic performance of the system is increased, 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. According to the two-stage synthesis gas preparation system and method with complementary biogas and solar energy, the generated synthesis gas with high calorific value is wide in application, the synthesis gas generated by the wet reactor can be used for power generation, and H is2Compared with the traditional methane reforming, the method has lower mol of CO and is a good raw material for preparing liquid fuel, synthesizing methanol, dimethyl ether and the like by F-T synthesis.
4. According to the two-section synthesis gas preparation system and method with complementary methane and solar energy, provided by the invention, part of methane is subjected to high-efficiency separation to obtain methane and carbon dioxide with higher concentration, and the carbon dioxide is mixed with the unseparated methane, so that the content of the carbon dioxide in methane reforming is greatly increased, the methane conversion rate is greatly improved, and the high CO content is obtained2/CH4The mol ratio greatly reduces the possibility of catalyst deactivation in the reaction and reduces the requirement on catalyst development. In addition, small amounts of carbon dioxide are present during the reactionThe possibility of catalyst deactivation can be reduced at high temperature, the application difficulty of the technology is reduced, and the economical efficiency of the technology is improved.
5. The two-section synthesis gas preparation system and method with complementary methane and solar energy, provided by the invention, have the advantages of simple technical process, mature technology of each part and convenience for industrial application.
Drawings
Fig. 1 is a schematic diagram of a two-stage biogas and solar complementary syngas production system in accordance with an embodiment of the present invention.
Fig. 2 is a flow chart of a two-stage syngas production process with biogas and solar energy complementary 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 two-stage syngas production system with complementary biogas and solar energy according to an embodiment of the invention, the two-stage syngas production system includes: first three-way valve 1, second three-way valve 2, one-level regenerator 3, primary reactor 4, third three-way valve 5, second grade regenerator 6, secondary reactor 7 and solar collector 8, wherein:
the first three-way valve 1 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 2 and the third three-way valve 5 are gas mixing devices each having two inlets and one outlet for mixing two gas streams into one gas stream. The primary heat exchanger 3 and the secondary heat exchanger 6 are heat regenerators in which a hot fluid and a cold fluid exchange heat. The primary reactor 4 and the secondary reactor 7 are a solar heat absorber and a reaction generator, and are used for converting solar radiation transmitted by the solar heat collector 8 into heat energy as reaction heat of the reforming reaction to generate the reforming reaction. The solar collector 8 is used for collecting and providing sunlight to the primary reactor 4 and the secondary reactor 7 as an energy source for reforming reaction.
In fig. 1, a first outlet of a first three-way valve 1 is connected with a first inlet of a second three-way valve 2, a second inlet of the second three-way valve 2 is communicated with water vapor, an outlet of the second three-way valve 2 is connected with a cold fluid inlet of a primary heat regenerator 3, a cold fluid outlet of the primary heat exchanger 3 is connected with an inlet of a primary reactor 4, and an outlet of the primary reactor 4 is connected with a first inlet of a third three-way valve 5 through a hot fluid inlet of the primary heat regenerator 3.
The second outlet of the first three-way valve 1 is connected with the second inlet of the third three-way valve 5, the outlet of the third three-way valve 5 is connected with the cold fluid inlet of the secondary heat exchanger 6, the cold fluid outlet of the secondary heat exchanger 6 is connected with the inlet of the secondary reactor 7, and the outlet of the secondary reactor 7 is connected with the hot fluid inlet of the secondary heat exchanger 6.
The first-stage reactor 4 and the second-stage reactor 7 can be tubular reactors, tower reactors, kettle reactors, reactors with solid particle beds, jet reactors, fixed bed reactors, fluidized bed reactors, cavity reactors, and the like.
The solar collector 8 is used for collecting sunlight and providing the sunlight to the primary reactor 4 and the secondary reactor 7 as an energy source for reforming reaction. The solar heat collector can be a single heat collector or a plurality of heat collectors, and is used for concentrating light and converting the light into heat energy.
Referring to fig. 1 again, the desulfurized biogas S1 is introduced into the two-stage syngas production system through the inlet of the first three-way valve 1, and is divided into two parts by the first three-way valve 1 in equal proportion, i.e., a first part desulfurized biogas S2 and a second part desulfurized biogas S8. The first part of desulfurized biogas S2 flows out from the first outlet of the first three-way valve 1 and enters the second three-way valve 2 from the first inlet of the second three-way valve 2, and is mixed with the water vapor S3 flowing in from the second inlet of the second three-way valve 2 in the second three-way valve 2 to obtain a mixture S4 of biogas and water vapor; the mixture S4 of methane and water vapor flows out of the outlet of the second three-way valve 2 to the primary heat exchanger 3 for preheating, the preheated mixture S5 of methane and water vapor flows out of the cold fluid outlet of the primary heat exchanger 3 and enters the primary reactor 4 from the inlet of the primary reactor 4, and the heat energy is absorbed in the primary reactor 4 to carry out reforming reaction, so that a synthesis gas mixture S6 is generated; the synthesis gas mixture S6 is cooled by the cold flow stream through the primary heat exchanger 3 to become a cooled synthesis gas mixture S7, the heat energy required in the reaction process is obtained by converting the solar radiation transmitted by the solar heat collector 8 through the primary reactor 4, and the cooled synthesis gas mixture S7 enters the third three-way valve 5 through the first inlet of the third three-way valve 5.
The second part of desulfurized biogas S8 flows out through the second outlet of the first three-way valve 1 and enters the third three-way valve 5 through the second inlet of the third three-way valve 5, forming a mixture S9 with the cooled syngas mixture S7 in the third three-way valve 5, the mixture S9 exiting from the outlet of the third three-way valve 5 and entering the secondary heat exchanger 6 from the cold fluid inlet of the secondary heat exchanger 6, preheating in a secondary heat exchanger 6, making the preheated mixture S10 flow out through a cold fluid outlet of the secondary heat exchanger 6 and enter a secondary reactor 7 from an inlet of the secondary reactor 7, absorbing heat energy in the secondary reactor 7 to carry out reforming reaction to generate synthesis gas S11, the heat energy required in the reaction process is obtained by converting the solar radiation transmitted by the solar heat collector 8 through the secondary reactor 7, and the synthesis gas S11 is cooled by the secondary heat exchanger 6 and then is output as a product. The synthesis gas output as a product can be used in the fields of power generation and chemical industry. The invention realizes the efficient complementary utilization of solar energy and methane, and has higher thermal, economic and environmental performance compared with the conventional methane and solar energy utilization system.
Based on the two-stage synthesis gas preparation system with complementary biogas and solar energy shown in fig. 1, fig. 2 shows a flow chart of a two-stage synthesis gas preparation method with complementary biogas and solar energy according to an embodiment of the invention, the method comprises the following steps:
s21, splitting the desulfurized biogas S1 into a first desulfurized biogas S2 and a second desulfurized biogas S8;
specifically, referring to fig. 1, the desulfurized biogas S1 is introduced into the two-stage synthesis gas preparation system through the inlet of the first three-way valve 1, and is proportionally divided into two parts by the first three-way valve 1, namely a first part desulfurized biogas S2 and a second part desulfurized biogas S8.
S22, mixing the desulfurized biogas S2 of the first part with steam, preheating, and absorbing heat energy in a primary reactor to carry out reforming reaction to generate a product of the reforming reaction;
specifically, the first part of desulfurized biogas S2 flows out through the first outlet of the first three-way valve 1 and enters the second three-way valve 2 through the first inlet of the second three-way valve 2, and is mixed with the second inflow water vapor S3 of the second three-way valve 2 in the second three-way valve 2 to obtain a biogas and water vapor mixture S4; the mixture S4 of methane and water vapor flows out of the outlet of the second three-way valve 2 to the primary heat exchanger 3 for preheating, the preheated mixture S5 of methane and water vapor flows out of the cold fluid outlet of the primary heat exchanger 3 and enters the primary reactor 4 from the inlet of the primary reactor 4, the heat energy is absorbed in the primary reactor 4 for reforming reaction to generate a synthesis gas mixture S6, and the heat energy required in the reaction process is obtained by the conversion of solar radiation transmitted by the solar heat collector 8 by the primary reactor 4;
and S23, cooling the product of the reforming reaction, mixing the cooled product with the second part of desulfurized biogas S8, preheating the mixture, absorbing heat energy in a secondary reactor to perform the reforming reaction, and cooling and outputting the product.
Specifically, the syngas mixture S6 is cooled by the cold stream through the primary heat exchanger 3 to become a cooled syngas mixture S7, and the cooled syngas mixture S7 enters the third three-way valve 5 through the first inlet of the third three-way valve 5. The second part of desulfurized biogas S8 flows out through the second outlet of the first three-way valve 1 and enters the third three-way valve 5 through the second inlet of the third three-way valve 5, forming a mixture S9 with the cooled syngas mixture S7 in the third three-way valve 5, the mixture S9 exiting from the outlet of the third three-way valve 5 and entering the secondary heat exchanger 6 from the cold fluid inlet of the secondary heat exchanger 6, preheating in a secondary heat exchanger 6, making the preheated mixture S10 flow out through a cold fluid outlet of the secondary heat exchanger 6 and enter a secondary reactor 7 from an inlet of the secondary reactor 7, absorbing heat energy in the secondary reactor 7 to carry out reforming reaction to generate synthesis gas S11, the heat energy required in the reaction process is obtained by converting the solar radiation transmitted by the solar heat collector 8 through the secondary reactor 7, and the synthesis gas S11 is cooled by the secondary heat exchanger 6 and then is output as a product. The synthesis gas output as a product can be used in the fields of power generation and chemical industry. The invention realizes the efficient complementary utilization of solar energy and methane, and has higher thermal, economic and environmental performance compared with the conventional methane and solar energy utilization system.
Based on the complementary utilization system and method of methane and solar energy provided by the invention, the invention mixes a part of methane with a certain amount of steam and enters a first-stage reactor, the methane and the steam are driven by solar energy to carry out reforming reaction, the product of the methane and the other part of methane are mixed and then enter a second-stage reactor, and the product of the methane and the other part of methane are also driven by solar energy to carry out reforming reaction to finally obtain the synthesis gas. The invention reduces the requirement on catalysis through step-by-step reaction, simultaneously improves the heat energy grade of solar energy to the chemical energy grade of synthesis gas by integrating solar energy collection and methane reforming, increases the thermodynamic performance of the system, reduces the consumption of water and improves the economical efficiency of the technology.
The biogas and solar complementary utilization method provided by the invention is further subjected to simulation calculation. The performance of the process according to the invention (separation ratio 0.5) compared with the conventional process of the prior art at a reaction temperature of 750 ℃ and a water-to-carbon ratio of 1, at atmospheric pressure and per kg of biogas (containing 60% methane and 40% carbon dioxide), is shown in table 1. Therefore, the heat value of the synthesis gas produced by the complementary utilization method of the methane and the solar energy provided by the invention has certain advantages compared with the conventional method, and in addition, the water consumption is greatly reduced (by 50%). In addition, the reduction of the capacity of the heating equipment caused by the reduction of the consumption of water enables the complementary utilization method of the methane and the solar energy provided by the invention to have higher economical efficiency.
TABLE 1 New System Performance parameters Table
Figure BDA0002163331370000071
Therefore, the system and the method for preparing the synthesis gas in the two-section mode by complementing the methane and the solar energy, provided by the invention, integrate the key points of solar heat collection, methane reforming and the likeThe unit technology greatly improves the heat value of the biogas; by integrating the high-temperature thermochemical unit, the energy utilization idea of utilizing the chemical energy of the biogas is embodied, and the thermal performance of the system is further improved. According to the invention, part of methane is subjected to high-efficiency separation to obtain methane and carbon dioxide with higher concentration, and the carbon dioxide is mixed with the unseparated methane, so that the content of the carbon dioxide in methane reforming is greatly increased, and the methane conversion rate is greatly improved. In addition, high CO2/CH4The mol ratio greatly reduces the possibility of catalyst deactivation in the reaction and reduces the requirement on catalyst development. Moreover, the invention can carry out methane wet reforming reaction on the methane with higher concentration obtained after separation and the steam, and the reaction can adopt a cheap commercial catalyst. In addition, the small amount of carbon dioxide present during the reaction also reduces the likelihood of catalyst deactivation at high temperatures.
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 (9)

1. The utility model provides a complementary two segmentation syngas preparation systems of marsh gas and solar energy, its characterized in that includes first three-way valve (1), second three-way valve (2), one-level regenerator (3), first order reactor (4), third three-way valve (5), second grade regenerator (6), second order reactor (7) and solar collector (8), wherein:
the first three-way valve (1) is a gas splitting device, is provided with an inlet and two outlets, and is used for splitting a gas flow into two gas flows according to a certain proportion, further splitting the desulfurized biogas (S1) into a first part of desulfurized biogas (S2) and a second part of desulfurized biogas (S8);
the second three-way valve (2) and the third three-way valve (5) are gas mixing devices, each having two inlets and one outlet, for mixing two gas streams into one gas stream;
the primary heat regenerator (3) and the secondary heat regenerator (6) are heat exchange equipment, and one hot fluid and one cold fluid exchange heat in the heat exchange equipment;
the solar heat collector (8) is used for collecting sunlight and providing the sunlight to the primary reactor (4) and the secondary reactor (7) as an energy source for reforming reaction;
the primary reactor (4) and the secondary reactor (7) are a solar heat absorption device and a reaction generation device, and are used for converting solar radiation transmitted by the solar heat collector (8) into heat energy which is used as reaction heat of reforming reaction and generating the reforming reaction;
the first part of desulfurized biogas (S2) is mixed with steam and then preheated, and then the first part of desulfurized biogas is absorbed by the first-stage reactor to carry out reforming reaction to generate a product of the reforming reaction;
and cooling the product of the reforming reaction, mixing the cooled product with the second part of desulfurized biogas (S8), preheating the mixture, absorbing heat energy in the secondary reactor to perform the reforming reaction, and cooling and outputting the heat energy.
2. The biogas and solar complementary two-stage synthesis gas preparation system according to claim 1, wherein the inlet of the first three-way valve (1) is fed with desulfurized biogas.
3. Two-stage biogas and solar complementary syngas production system according to claim 1, characterized in that the primary regenerator (3) and the secondary regenerator (6) are both heat exchangers.
4. The biogas and solar complementary two-stage synthesis gas preparation system according to claim 1, wherein the primary reactor (4) and the secondary reactor (7) are each a tubular reactor, a tower reactor, a tank reactor, a reactor with a bed of solid particles, a jet reactor, a fixed bed reactor, a fluidized bed reactor or a cavity reactor.
5. Two-stage biogas and solar complementary syngas production system according to claim 1, characterized in that the solar collector (8) is a single or multiple collector for concentrating light to convert into heat energy.
6. A two-stage biogas and solar complementary syngas production method applied to the two-stage 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 (S8);
mixing the first part of desulfurized biogas (S2) with steam, preheating, and absorbing heat energy in a primary reactor to carry out reforming reaction to generate a product of the reforming reaction;
cooling the product of the reforming reaction, mixing the cooled product with a second part of desulfurized biogas (S8), preheating the mixture, absorbing heat energy in a secondary reactor to perform the reforming reaction, cooling the reaction product and outputting the cooled reaction product.
7. The two-stage process for the preparation of biogas and solar complementary syngas according to claim 6, characterized in that the splitting of the desulfurized biogas (S1) is carried out by means of a first three-way valve (1).
8. The biogas and solar complementary two-stage synthesis gas preparation method according to claim 6, wherein the first partially desulfurized biogas (S2) is mixed with steam and preheated, and then the mixture is subjected to a reforming reaction by absorbing heat energy in the first stage reactor (4) to generate a product of the reforming reaction, specifically comprising:
enabling a first part of desulfurized biogas (S2) to flow out through a first outlet of the first three-way valve (1), enabling the biogas to enter the second three-way valve (2) from a first inlet of the second three-way valve (2), and mixing the biogas with water vapor (S3) flowing in the second three-way valve (2) to obtain a biogas and water vapor mixture (S4); the mixture (S4) of the marsh gas and the steam flows out to the primary heat exchanger (3) through an outlet of the second three-way valve (2) for preheating, the preheated mixture (S5) of the marsh gas and the steam flows out through a cold fluid outlet of the primary heat exchanger (3) and enters the primary reactor (4) from an inlet of the primary reactor (4), heat energy is absorbed in the primary reactor (4) for reforming reaction to generate a synthesis gas mixture (S6), and the heat energy required in the reaction process is obtained by converting solar radiation transmitted from the solar heat collector (8) through the primary reactor (4).
9. The method for preparing biogas and solar complementary two-stage synthesis gas according to claim 6, wherein the product of the reforming reaction is cooled and then mixed with a second portion of desulfurized biogas (S8), preheated and then subjected to a reforming reaction by absorbing heat energy in a two-stage reactor, and then cooled and outputted, and comprises:
the synthesis gas mixture (S6) is cooled by the cold flow through the primary heat exchanger (3) to become a cooled synthesis gas mixture (S7), and the cooled synthesis gas mixture (S7) enters the third three-way valve (5) through the first inlet of the third three-way valve (5);
enabling a second part of desulfurized biogas (S8) to flow out through a second outlet of the first three-way valve (1), enabling the biogas to enter the third three-way valve (5) through a second inlet of the third three-way valve (5), forming a mixture (S9) with the cooled synthesis gas mixture (S7) in the third three-way valve (5), enabling the mixture (S9) to flow out through an outlet of the third three-way valve (5), enabling the mixture to enter the secondary heat exchanger (6) through a cold fluid inlet of the secondary heat exchanger (6), preheating in the secondary heat exchanger (6), enabling the preheated mixture (S10) to flow out through a cold fluid outlet of the secondary heat exchanger (6), enabling the mixture to enter the secondary reactor (7) through an inlet of the secondary reactor (7), absorbing heat energy in the secondary reactor (7) to continue to perform reforming reaction, and generating synthesis gas (S11); the heat energy required in the reaction process is obtained by converting the solar radiation transmitted by the solar heat collector (8) through the secondary reactor (7),
and the synthesis gas (S11) is cooled by the secondary heat exchanger (6) and then is output as a product.
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