Auxiliary combustion system and method for solar-driven carbon capture and conversion

Abstract

The invention discloses an auxiliary combustion system and method for solar-driven carbon capture and conversion. The system comprises a hydrophobic membrane-based CO2 capture unit, a photoelectric concerted catalysis CO2 reduction unit, an oxygen-enriched combustion adjusting unit and an organic polymer membrane pervaporation dealcoholization unit. Smoke in the atmosphere or generated by combustion equipment is purified and then enters the hydrophobic membrane-based CO2 capturing unit, CO2 is captured by absorption liquid, then gas-liquid separation is carried out, the separated absorption liquid is regenerated through solar heating, cyclic utilization is achieved, CO2 enters the photoelectric concerted catalysis CO2 reduction unit, green electricity is generated through light-electricity conversion, electrocatalysis is adopted for leading, and the CO2 is recycled. CO2 is synergistically reduced in a photocatalytic auxiliary mode, oxygen generated by the anode is sent back to the combustion equipment for oxygen-enriched combustion, and alcohol substances generated by the cathode are separated from the electrolyte through the organic polymer membrane pervaporation dealcoholization unit and then are sent back to the combustion equipment to serve as auxiliary fuel. Solar energy is used as the unique driving energy, fuel consumption is reduced while carbon emission is reduced, and good economic value is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide capture and resource utilization, and in particular to an auxiliary combustion system and method for solar-driven carbon capture and conversion. Background Art

[0002] In recent years, with the rapid growth of the global economy, carbon dioxide emissions have risen sharply, posing a severe challenge to the ecological environment. Faced with the dual pressures of global climate change and energy crisis, human society urgently needs to explore new technologies for efficient and clean energy conversion and utilization to ensure sustainable development. In this context, capturing carbon dioxide and converting it into usable carbon resources has become a hot technical problem that the industry urgently needs to solve.

[0003] Combustion is still the main technical method for utilizing carbon-based fuels, and carbon capture and conversion technology is integrated into the combustion system. The current field of carbon dioxide capture and conversion still faces many technical difficulties and challenges. On the one hand, traditional capture and conversion processes often require additional electricity or heat input, which not only increases energy consumption, but may also weaken emission reduction results due to carbon emissions in the energy production process. On the other hand, the storage and long-distance transportation of conversion products have greatly increased economic costs, and there is also a potential risk of leakage, which seriously restricts its large-scale application.

[0004] Among the reduction products of carbon dioxide, alcohols have great potential for industrial application due to their high energy density, ease of transportation and storage, relatively clean combustion, and can be directly applied to combustion systems. However, compared with coal and gasoline, the lower calorific value of alcohols poses a challenge to the combustion stability of the burner. Therefore, when using alcohols as fuel, the operating conditions of the burner need to be finely controlled.

[0005] In summary, developing a new combustion system that is economical, environmentally friendly and has combustion stability has become an important issue that needs to be solved urgently. Summary of the invention

[0006] In order to solve the shortcomings of the above-mentioned carbon capture and conversion technology when coupled with the combustion system, the purpose of the present invention is to provide a solar-driven carbon capture and conversion auxiliary combustion system and method. The system uses solar energy as the only driving energy source, integrates carbon capture, conversion, and product separation functions, and aims to achieve efficient conversion and on-site utilization of carbon dioxide, thereby reducing the risks and costs of intermediate links. During operation, the cathode product alcohol is injected back into the combustion system as an auxiliary fuel, and the anode product oxygen is precisely controlled for oxygen-rich combustion, which improves combustion efficiency and reduces pollution while reducing the main fuel consumption.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A solar-driven carbon capture and conversion auxiliary combustion system, including a hydrophobic membrane-based CO 2 Capture unit 1: Photoelectric synergistic catalysis of CO 2 Reduction unit 2, oxygen-enriched combustion adjustment unit 3 and organic polymer membrane pervaporation dealcoholization unit 4;

[0009] The hydrophobic membrane-based CO 2 The first port of the capture unit 1 is connected to the photoelectric catalytic CO 2 The reduction unit 2 is connected to receive the flue gas from the atmosphere or the combustion equipment, and the CO is captured by the absorption liquid after purification. 2 , and then the CO after gas-liquid separation 2 Output: The photoelectric synergistic catalysis CO 2 The anode end of the reduction unit 2 is connected to the oxygen-enriched combustion adjustment unit 3, and the cathode end is connected to the organic polymer membrane pervaporation dealcoholization unit 4, which is used to produce green electricity by light-to-electricity conversion, and to reduce CO in a coordinated manner in an electrocatalytically-dominated and photocatalytically-assisted mode. 2 , generating anode product oxygen and cathode product alcohol substances; the oxygen-rich combustion adjustment unit 3 and the hydrophobic membrane-based CO 2 The second port of the capture unit 1 is connected to the second port of the capture unit 1 for returning oxygen to the combustion equipment for regulating oxygen-enriched combustion; the organic polymer membrane pervaporation dealcoholization unit 4 is connected to the hydrophobic membrane-based CO 2 The third port of the capture unit 1 is connected to separate the alcohol substances from the electrolyte through the organic polymer membrane pervaporation technology, and return them to the combustion equipment to serve as auxiliary fuel.

[0010] Preferably, the hydrophobic membrane-based CO 2 The capture unit 1 includes a combustion device 1-1, a flue gas purification device 1-2, a hydrophobic membrane-based CO 2 A capture device 1-3, a gas-liquid separator 1-4, a first light collector 1-5, a first heater 1-6 and a first flow regulating valve 1-7;

[0011] The flue gas in the atmosphere or generated by the combustion equipment 1-1 is connected to the flue gas purification device 1-2 to remove impurities, and the hydrophobic membrane-based CO 2 The capture device 1-3 is connected to the flue gas purification device 1-2, and uses a hydrophobic membrane and an absorption liquid to capture CO 2 The gas-liquid mixture is formed, and the gas-liquid separator 1-4 is connected with the hydrophobic membrane-based CO 2 The capture device 1-3 is connected, the separated liquid is connected to the first heater 1-6, the first light collector 1-5 collects solar energy and transmits it to the first heater 1-6 to regenerate the absorption liquid and then flow back to the hydrophobic membrane base CO 2 The gas phase of the capture device 1-3 and the gas-liquid separator 1-4 is connected to the photoelectric synergistic catalytic CO after passing through the first flow regulating valve 1-7. 2Reduction unit 2.

[0012] Preferably, the hydrophobic membrane-based CO 2 The absorption liquid of the capture device 1-3 is an alcohol amine absorption liquid, a sterically hindered amine absorption liquid or an ionic liquid absorption liquid, and the absorption liquid can be regenerated by heating under solar energy drive, and the heating temperature range is 70°C-130°C; the hydrophobic membrane-based CO 2 The hydrophobic membrane of the capture device 1-3 is a super-hydrophobically modified polypropylene membrane, polytetrafluoroethylene membrane or polyvinylidene fluoride membrane.

[0013] Preferably, the photoelectric synergistic catalysis CO 2 The reduction unit 2 includes a photoelectrochemical cell 2-1, a second light collector 2-2, a photovoltaic panel 2-3, a collection tank 2-4 and a second flow regulating valve 2-5;

[0014] Photoelectrochemical cell 2-1 from hydrophobic membrane-based CO 2 Capture unit 1 receives the output CO 2 Part of the sunlight collected by the second light collector 2-2 is directly transmitted to the photoelectrochemical cell 2-1 as a light source, and the other part is converted into electrical energy by the photovoltaic panel 2-3 and then transmitted to the photoelectrochemical cell 2-1 as a power source. The anode outlet of the photoelectrochemical cell 2-1 is connected to the oxygen-rich combustion regulating unit 3, and the cathode outlet of the photoelectrochemical cell 2-1 is connected to the collecting tank 2-4. The collecting tank 2-4 sends the liquid product to the organic polymer membrane pervaporation dealcoholization unit 4 through the second flow regulating valve 2-5.

[0015] Preferably, the photoelectrochemical cell 2 - 1 is a flow-type photoelectrochemical cell or a membrane electrode assembly type photoelectrochemical cell.

[0016] Preferably, the oxygen-rich combustion regulating unit 3 includes a gas drying device 3-1, an oxygen storage tank 3-2 and a third flow regulating valve 3-3;

[0017] Gas drying device 3-1 Photoelectric synergistic catalysis of CO 2 The reduction unit 2 receives the anode product oxygen, dries it and transports it to the oxygen storage tank 3-2. The oxygen storage tank 3-2 returns the oxygen to the hydrophobic membrane-based CO through the third flow regulating valve 3-3. 2 The combustion device 1 - 1 of the capture unit 1 performs oxygen-rich combustion.

[0018] Preferably, the organic polymer membrane pervaporation alcohol removal unit 4 comprises a third light collector 4-1, a second heater 4-2, an organic polymer membrane pervaporation alcohol removal device 4-3, a condenser 4-4, an alcohol storage tank 4-5 and a fourth flow regulating valve 4-6;

[0019] The second heater 4-2 cooperates with the photoelectric catalysis of CO 2The liquid product is preheated by solar energy collected by the light collector 4-1 and sent to the organic polymer membrane pervaporation alcohol removal device 4-3. The alcohol substances separated by the organic polymer membrane pervaporation alcohol removal device 4-3 are condensed by the condenser 4-4 and then sent to the alcohol storage tank 4-5. The alcohol storage tank 4-5 sends the alcohol substances to the hydrophobic membrane-based CO 2 through the fourth flow regulating valve 4-6. 2 The combustion device 1 - 1 of the capture unit 1 acts as an auxiliary fuel.

[0020] Preferably, the preheating temperature of the second heater 4 - 2 ranges from 30° C. to 75° C.

[0021] Preferably, the second outlet of the organic polymer membrane pervaporation alcohol removal device 4-3 is connected to the photoelectric synergistic catalytic CO 2 The reduction unit 2 is connected to the photoelectrochemical cell 2-1, and is used to return the electrolyte after the alcohol is separated to the photoelectrochemical cell 2-1 for recycling.

[0022] Preferably, the organic polymer membrane in the organic polymer membrane pervaporation alcohol removal device 4 - 3 is a polydimethylsiloxane membrane, a polytrimethylpropyne membrane, a polyether block amide membrane or a composite modified membrane thereof.

[0023] The present invention proposes a solar-driven carbon capture and conversion auxiliary combustion method, comprising the following steps:

[0024] The flue gas in the atmosphere or generated by combustion equipment enters the hydrophobic membrane-based CO after purification. 2 Capture unit 1, using hydrophobic membrane and absorption liquid to capture CO 2 After forming a gas-liquid mixture, the gas-liquid separation is carried out, and the separated absorption liquid is heated and regenerated under the drive of solar energy and recycled for CO 2 Capture and separate CO 2 Enter photocatalytic CO 2 Reduction unit 2;

[0025] Photocatalytic CO 2 In the reduction unit 2, the green electricity generated by light-to-electricity conversion is used to reduce CO 2 Reduction, producing oxygen as an anode product and alcohols as a cathode product;

[0026] The anode product oxygen is sent back to the hydrophobic membrane-based CO through the oxygen-rich combustion adjustment unit 3. 2 The combustion equipment of the capture unit 1, adjusting the oxygen-enriched combustion conditions of the combustion equipment;

[0027] The cathode product alcohols are separated from the electrolyte by organic polymer membrane pervaporation and de-alcoholization unit 4, and then sent back to the hydrophobic membrane-based CO 2The combustion equipment of the capture unit 1 serves as auxiliary fuel, and the electrolyte after alcohol separation is recycled to the photoelectric collaborative catalytic CO 2 reduction unit 2 for recycling.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The auxiliary combustion system for solar-driven carbon capture and conversion proposed by the present invention relies solely on solar energy as the only driving energy. Compared with the prior art, which often requires additional power or heat energy supply during the carbon capture and conversion process, this system avoids carbon emissions generated by energy acquisition from the source, thereby significantly improving the emission reduction effect of the system.

[0030] (2) Innovatively integrating the functions of carbon capture, conversion, and product separation, it realizes the in-situ conversion and efficient utilization of carbon dioxide, improving the dilemma that a large amount of carbon products are difficult to properly handle due to the complexity of traditional technologies, and effectively reducing the loss of carbon dioxide in the conversion process. In addition, through the integrated design, it prevents additional costs such as equipment maintenance and material transfer caused by complex processes, as well as potential technical risks and material loss risks, significantly reducing the overall operating cost.

[0031] (3) When the system operates, the alcohol substances generated at the cathode can be directly used as auxiliary fuel and reinjected into the combustion equipment, and the anode product oxygen can be precisely used to adjust the oxy-fuel combustion. Different from the prior art where the reaction products cannot be fully utilized and resources are wasted, the present invention deeply explores the value of the products, optimizes the combustion conditions while reducing fuel consumption, and maximally improves the energy utilization efficiency.

[0032] (4) The system of the present invention respectively uses carbon dioxide membrane absorption technology, carbon dioxide photoelectrocatalytic reduction technology, and organic polymer membrane pervaporation alcohol removal technology to achieve carbon capture, conversion, and product separation. These three technologies all show advantages such as low cost, high efficiency, environmental friendliness, strong stability, and small equipment volume in their respective fields, and can be adapted to a variety of industrial application scenarios. Moreover, the entire system adopts a modular design, which is convenient for installation and subsequent unit replacement, and can reasonably design the specific implementation methods of each module according to the combustion characteristics of the burner and different carbon emissions, realizing the functional customization of the product. Description of the Drawings

[0033] Figure 1 It is the system structure diagram of the auxiliary combustion system for solar-driven carbon capture and conversion of the present invention.

[0034] Figure 2 It is the flow chart of the auxiliary combustion system for solar-driven carbon capture and conversion of the present invention.

[0035] Description of the Reference Numerals:

[0036] 1. Hydrophobic membrane-based CO 2 Capture unit; 2. Photoelectric synergistic catalysis of CO 2 Reduction unit; 3. Oxygen-enriched combustion adjustment unit; 4. Organic polymer membrane pervaporation dealcoholization unit; 1-1. Combustion equipment; 1-2. Flue gas purification device; 1-3. Hydrophobic membrane-based CO 2 Capture device; 1-4, gas-liquid separator; 1-5, first light collector; 1-6, first heater; 1-7, first flow regulating valve; 2-1, photoelectrochemical cell; 2-2, second light collector; 2-3, photovoltaic panel; 2-4, collection tank; 2-5, second flow regulating valve; 3-1, gas drying device; 3-2, oxygen storage tank; 3-3, third flow regulating valve; 4-1, third light collector; 4-2, second heater; 4-3, organic polymer membrane pervaporation dealcoholization device; 4-4, condenser; 4-5, alcohol storage tank; 4-6, fourth flow regulating valve. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] The present invention proposes a solar-driven carbon capture and conversion auxiliary combustion system, such as Figure 1 to Figure 2 As shown, including hydrophobic membrane-based CO 2 Capture unit 1: Photoelectric synergistic catalysis of CO 2 Reduction unit 2, oxygen-enriched combustion adjustment unit 3 and organic polymer membrane pervaporation dealcoholization unit 4. Hydrophobic membrane-based CO 2 The first port of the capture unit 1 cooperates with the photoelectric catalysis of CO 2 The reduction unit 2 is connected to receive the flue gas from the atmosphere or the combustion equipment, and the CO is captured by the absorption liquid after purification. 2 , and then the CO after gas-liquid separation 2 Output. Photoelectric synergistic catalysis of CO 2 The anode end of the reduction unit 2 is connected to the oxygen-enriched combustion adjustment unit 3, and the cathode end is connected to the organic polymer membrane pervaporation dealcoholization unit 4, which is used to produce green electricity by light-to-electricity conversion, and to reduce CO in a coordinated manner in an electrocatalytically-dominated and photocatalytically-assisted mode. 2 , generating anode product oxygen and cathode product alcohol substances. Oxygen-enriched combustion adjustment unit 3 and hydrophobic membrane-based CO 2 The second port of the capture unit 1 is connected to the oxygen return device to adjust the oxygen-enriched combustion. The organic polymer membrane pervaporation dealcoholization unit 4 is connected to the hydrophobic membrane-based CO 2 The third port of the capture unit 1 is connected to separate the alcohol substances from the electrolyte through the organic polymer membrane pervaporation technology, and return them to the combustion equipment to serve as auxiliary fuel.

[0039] The specific auxiliary combustion method of solar-driven carbon capture and conversion is as follows:

[0040] In the hydrophobic membrane-based CO 2 In the capture unit 1, the flue gas generated by the combustion of carbon-based fuel in the combustion equipment 1-1 first enters the flue gas purification device 1-2 to remove impurities such as large particles, soluble pollutants and nitrogen oxides, and then the gas is cooled to room temperature and sent to the hydrophobic membrane-based CO 2 Capture device 1-3, hydrophobic membrane-based CO 2 Capture device 1-3 uses 0.5 mol·L -1 The diethanolamine solution was used as the absorption liquid, and nano-SiO 2 The polyvinylidene fluoride membrane modified by self-assembly method is used as the hydrophobic membrane. The effective area of ​​the membrane module is 1m 2 , the flue gas and the absorption liquid flow in countercurrent on both sides of the membrane, CO 2 Under the driving force of concentration gradient, it diffuses through the membrane pores to the gas-liquid contact surface, forms a gas-liquid mixture with the absorbent, and then enters the gas-liquid separator 1-4. The separated diethanolamine absorbent flows to the first heater 1-6. The first light collector 1-5 collects solar energy to heat the first heater 1-6 to 120°C, realizing thermal regeneration of the absorbent. The absorbent flows back to the hydrophobic membrane-based CO 2 Capture devices 1-3 are used in cycles, and CO 2 The photoelectric synergistic catalytic CO enters through the first flow regulating valve 1-7 2 Reduction unit 2.

[0041] Photocatalytic CO 2 The reduction unit 2 includes a photoelectrochemical cell 2-1, a second light collector 2-2, a photovoltaic panel 2-3, a collection tank 2-4, and a second flow regulating valve 2-5. A part of the sunlight collected by the second light collector 2-2 is directly transported to the photoelectrochemical cell 2-1 as a light source, and the other part is converted into electrical energy by the photovoltaic panel 2-3 and then transported to the photoelectrochemical cell 2-1 as a power source. The photoelectrochemical cell 2-1 is a flow-type photoelectrochemical cell, which uses highly active FeS 2 / TiO 2 The catalyst is loaded on the gas diffusion electrode to achieve CO 2 To the efficient photoelectric coordinated catalytic reduction of ethanol, the anode outlet of the photoelectrochemical cell 2-1 is connected to the oxygen-rich combustion adjustment unit 3, and the cathode outlet is connected to the collection tank 2-4, and the liquid phase product containing ethanol is sent to the organic polymer membrane pervaporation dealcoholization unit 4 through the second flow regulating valve 2-5;

[0042] The gas drying device 3-1 of the oxygen-enriched combustion regulating unit 3 uses a drying tube filled with a small molecular sieve desiccant to dry the gas from the photoelectric synergistic catalytic CO 2The oxygen output from the reduction unit 2 is quickly dried and stored in the oxygen storage tank 3-2. The oxygen is then fed back to the hydrophobic membrane-based CO 2 via the third flow regulating valve 3-3 at an appropriate flow rate according to the combustion conditions. 2 The combustion device 1-1 of the capture unit 1 performs oxygen-enriched combustion;

[0043] In the organic polymer membrane pervaporation alcohol removal unit 4, the second heater 4-2 cooperates with the photoelectric catalysis CO 2 The liquid product is preheated to 60°C by using the solar energy collected by the third light collector 4-1, and then sent to the organic polymer membrane pervaporation alcohol removal device 4-3. The organic polymer membrane pervaporation alcohol removal device 4-3 uses an ultra-thin polydimethylsiloxane membrane modified with a zeolite imidazole ester framework, and the effective membrane area is 0.5m 2 The separated ethanol is condensed by condenser 4-4 and transported to alcohol storage tank 4-5, and finally transported to hydrophobic membrane-based CO through fourth flow regulating valve 4-6 according to the combustion conditions. 2 The combustion device 1-1 of the capture unit 1 acts as an auxiliary fuel. At the same time, the dealcoholized electrolyte is returned to the photoelectric catalytic CO 2 The photoelectrochemical cell 2-1 of the reduction unit 2 is circulated for use.

[0044] After multiple tests and verifications, the hydrophobic membrane-based CO 2 Capture device 1-3 for CO in motor vehicle exhaust 2 The capture efficiency can reach 40% to 60%, the Faraday efficiency of the photoelectrochemical cell 2-1 for reducing alcohols is 25% to 40%, and the separation efficiency of the organic polymer membrane pervaporation dealcoholization device 4-3 for alcohols reaches 80% to 95%. Overall, the combustion efficiency of the combustion system is improved by 5% to 15%, and the fuel consumption is reduced by 5% to 10%. After oxygen-enriched combustion adjustment, the combustion of alcohols as auxiliary fuel further reduces carbon emissions, and has no obvious negative impact on the combustion performance.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A solar-driven carbon capture and conversion auxiliary combustion system, characterized in that: It comprises a hydrophobic membrane-based CO2 capture unit (1), a photoelectric synergistic catalytic CO2 reduction unit (2), an oxygen-enriched combustion adjustment unit (3) and an organic polymer membrane pervaporation dealcoholization unit (4); The first port of the hydrophobic membrane-based CO2 capture unit (1) is connected to the photoelectric synergistic catalytic CO2 reduction unit (2) for receiving flue gas from the atmosphere or generated by combustion equipment, capturing CO2 with an absorbing liquid after purification, and then outputting the CO2 after gas-liquid separation; the anode end of the photoelectric synergistic catalytic CO2 reduction unit (2) is connected to the oxygen-enriched combustion adjustment unit (3), and the cathode end is connected to the organic polymer membrane pervaporation dealcoholization unit (4), for producing green electricity by light-to-electricity conversion, synergistically reducing CO2 in an electrocatalytically dominant and photocatalytically assisted mode to generate anode product oxygen and cathode product alcohol substances; The oxygen-enriched combustion regulating unit (3) is connected to the second port of the hydrophobic membrane-based CO2 capture unit (1) and is used to return oxygen to the combustion equipment for regulating oxygen-enriched combustion; the organic polymer membrane pervaporation dealcoholization unit (4) is connected to the third port of the hydrophobic membrane-based CO2 capture unit (1) and is used to separate alcohol substances from the electrolyte through organic polymer membrane pervaporation technology and return them to the combustion equipment to serve as auxiliary fuel.

2. The solar-driven carbon capture and conversion auxiliary combustion system according to claim 1, characterized in that: The hydrophobic membrane-based CO2 capture unit (1) comprises a combustion device (1-1), a flue gas purification device (1-2), a hydrophobic membrane-based CO2 capture device (1-3), a gas-liquid separator (1-4), a first light collector (1-5), a first heater (1-6) and a first flow regulating valve (1-7); Flue gas in the atmosphere or generated by a combustion device (1-1) is connected to a flue gas purification device (1-2) to remove impurities. A hydrophobic membrane-based CO2 capture device (1-3) is connected to the flue gas purification device (1-2). CO2 is captured using a hydrophobic membrane and an absorption liquid to form a gas-liquid mixture. A gas-liquid separator (1-4) is connected to the hydrophobic membrane-based CO2 capture device (1-3). The separated liquid is connected to a first heater (1-6). A first light collector (1-5) collects solar energy and transmits it to the first heater (1-6) to regenerate the absorption liquid and then reflux it to the hydrophobic membrane-based CO2 capture device (1-3). The gas phase of the gas-liquid separator (1-4) is connected to a photoelectric synergistic catalytic CO2 reduction unit (2) after passing through a first flow regulating valve (1-7).

3. The solar-driven carbon capture and conversion auxiliary combustion system according to claim 2, characterized in that: The absorption liquid of the hydrophobic membrane-based CO2 capture device (1-3) is an alcohol amine absorption liquid, a sterically hindered amine absorption liquid or an ionic liquid absorption liquid, and the absorption liquid can be regenerated by heating under the drive of solar energy, and the heating temperature range is 70°C-130°C; the hydrophobic membrane of the hydrophobic membrane-based CO2 capture device (1-3) is a super-hydrophobic modified polypropylene membrane, a polytetrafluoroethylene membrane or a polyvinylidene fluoride membrane.

4. The solar-driven carbon capture and conversion auxiliary combustion system according to claim 1, characterized in that: The photoelectric coordinated catalytic CO2 reduction unit (2) comprises a photoelectrochemical cell (2-1), a second light collector (2-2), a photovoltaic panel (2-3), a collection tank (2-4) and a second flow regulating valve (2-5); The photoelectrochemical cell (2-1) receives the output CO2 from the hydrophobic membrane-based CO2 capture unit (1), a part of the sunlight collected by the second light collector (2-2) is directly transmitted to the photoelectrochemical cell (2-1) as a light source, and the other part is converted into electrical energy by the photovoltaic panel (2-3) and then transmitted to the photoelectrochemical cell (2-1) as a power source. The anode outlet of the photoelectrochemical cell (2-1) is connected to the oxygen-enriched combustion regulating unit (3), and the cathode outlet of the photoelectrochemical cell (2-1) is connected to the collection tank (2-4). The collection tank (2-4) sends the liquid product to the organic polymer membrane pervaporation dealcoholization unit (4) through the second flow regulating valve (2-5).

5. The solar-driven carbon capture and conversion auxiliary combustion system according to claim 4, characterized in that: The photoelectrochemical cell (2-1) is a flow-type photoelectrochemical cell or a membrane electrode assembly type photoelectrochemical cell.

6. The solar-driven carbon capture and conversion auxiliary combustion system according to claim 1, characterized in that: The oxygen-rich combustion regulating unit (3) comprises a gas drying device (3-1), an oxygen storage tank (3-2) and a third flow regulating valve (3-3); The gas drying device (3-1) receives the anode product oxygen from the photoelectric coordinated catalytic CO2 reduction unit (2), dries it and transports it to the oxygen storage tank (3-2), and the oxygen storage tank (3-2) returns the oxygen to the combustion device (1-1) of the hydrophobic membrane-based CO2 capture unit (1) through a third flow regulating valve (3-3) for oxygen-enriched combustion.

7. The solar-driven carbon capture and conversion auxiliary combustion system according to claim 1, characterized in that: The organic polymer membrane pervaporation alcohol removal unit (4) comprises a third light collector (4-1), a second heater (4-2), an organic polymer membrane pervaporation alcohol removal device (4-3), a condenser (4-4), an alcohol storage tank (4-5) and a fourth flow regulating valve (4-6); The second heater (4-2) is connected to the photoelectric synergistic catalytic CO2 reduction unit (2), and uses the solar energy collected by the third light collector (4-1) to preheat the liquid product and send it to the organic polymer membrane pervaporation dealcoholization device (4-3). The alcohol substance separated from the first outlet of the organic polymer membrane pervaporation dealcoholization device (4-3) is condensed by the condenser (4-4) and then sent to the alcohol storage tank (4-5). The alcohol storage tank (4-5) transports the alcohol substance to the combustion equipment (1-1) of the hydrophobic membrane-based CO2 capture unit (1) through the fourth flow regulating valve (4-6) to serve as auxiliary fuel; the second outlet of the organic polymer membrane pervaporation dealcoholization device (4-3) is connected to the photoelectrochemical cell (2-1) of the photoelectric synergistic catalytic CO2 reduction unit (2), and is used to return the electrolyte after the alcohol is separated to the photoelectrochemical cell (2-1) for recycling.

8. The solar-driven carbon capture and conversion auxiliary combustion system according to claim 7, characterized in that: The preheating temperature range of the second heater (4-2) is 30°C-75°C.

9. The solar-driven carbon capture and conversion auxiliary combustion system according to claim 7, characterized in that: The organic polymer membrane in the organic polymer membrane pervaporation alcohol removal device (4-3) is a polydimethylsiloxane membrane, a polytrimethylpropyne membrane, a polyether block amide membrane or a composite modified membrane thereof.

10. The working method of the auxiliary combustion system for solar-driven carbon capture and conversion according to claim 1, characterized in that: The following steps are involved: Flue gas in the atmosphere or generated by combustion equipment enters the hydrophobic membrane-based CO2 capture unit (1) after purification, and CO2 is captured by the hydrophobic membrane and the absorbent to form a gas-liquid mixture for gas-liquid separation. The separated absorbent is heated and regenerated under the drive of solar energy and recycled for CO2 capture. The separated CO2 enters the photoelectric synergistic catalytic CO2 reduction unit (2); In the photoelectric synergistic catalytic CO2 reduction unit (2), green electric energy generated by light-to-electricity conversion is used to reduce CO2 in a synergistic catalytic manner dominated by electrocatalysis and assisted by photocatalysis, thereby producing oxygen as an anode product and alcohols as a cathode product; The anode product oxygen is sent back to the combustion equipment of the hydrophobic membrane-based CO2 capture unit (1) through the oxygen-enriched combustion adjustment unit (3) to adjust the oxygen-enriched combustion conditions of the combustion equipment; The cathode product alcohol is separated from the electrolyte through an organic polymer membrane pervaporation dealcoholization unit (4), and then sent back to the combustion equipment of the hydrophobic membrane-based CO2 capture unit (1) as auxiliary fuel. The electrolyte after the alcohol is separated is returned to the photoelectric coordinated catalytic CO2 reduction unit (2) for recycling.

Images