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 PDFInfo
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- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 48
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 48
- 230000000295 complement effect Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 238000006057 reforming reaction Methods 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims description 34
- 239000012530 fluid Substances 0.000 claims description 25
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 8
- 230000005855 radiation Effects 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 claims 4
- 230000023556 desulfurization Effects 0.000 claims 4
- 238000002407 reforming Methods 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 102
- 239000007789 gas Substances 0.000 description 37
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 27
- 229910002092 carbon dioxide Inorganic materials 0.000 description 14
- 239000001569 carbon dioxide Substances 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 11
- 239000003054 catalyst Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 230000009849 deactivation Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
- C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/02—Processes for making hydrogen or synthesis gas
- C01B2203/0205—Processes for making hydrogen or synthesis gas containing a reforming step
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/06—Integration with other chemical processes
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/08—Methods of heating or cooling
- C01B2203/0805—Methods of heating the process for making hydrogen or synthesis gas
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/14—Details of the flowsheet
- C01B2203/142—At least two reforming, decomposition or partial oxidation steps in series
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P20/00—Technologies relating to chemical industry
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- Y02P20/133—Renewable energy sources, e.g. sunlight
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Abstract
一种沼气和太阳能互补的两段式合成气制备系统及方法，该系统包括：第一三通阀、第二三通阀、一级回热器、一级反应器、第三三通阀、二级回热器、二级反应器和太阳能集热器。将脱硫后的沼气分流，分成第一部分脱硫后沼气和第二部分脱硫后沼气；第一部分脱硫后沼气和水蒸气混合后预热，然后在一级反应器中吸收由太阳能转换成的热能并发生重整反应，生成重整反应的产物；重整反应的产物冷却后与第二部分脱硫后沼气混合，预热后在二级反应器中吸收由太阳能转换成的热能并发生重整反应，冷却后输出。本发明通过集成太阳能集热、两段式沼气重整将太阳能的热能品位提升至合成气的化学能品位，减少了对水的消耗，提升了沼气和太阳能利用的经济性。
A biogas and solar energy complementary two-stage synthesis gas preparation system and method, the system comprises: a first three-way valve, a second three-way valve, a primary regenerator, a primary reactor, a third three-way valve, Secondary regenerators, secondary reactors and solar collectors. Divide the desulfurized biogas into the first part of the desulfurized biogas and the second part of the desulfurized biogas; the first part of the desulfurized biogas and steam are mixed and preheated, and then the thermal energy converted from solar energy is absorbed in the primary reactor and generated. The reforming reaction generates the product of the reforming reaction; the product of the reforming reaction is mixed with the second part of the desulfurized biogas after cooling, and after preheating, the heat energy converted from the solar energy is absorbed in the secondary reactor and the reforming reaction occurs, and the cooling output later. The invention improves the thermal energy grade of solar energy to the chemical energy grade of synthesis gas by integrating solar energy collection and two-stage biogas reforming, reduces water consumption, and improves the economy of biogas and solar energy utilization.
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 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
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)
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