Auxiliary combustion system for solar-driven carbon capture and conversion

Abstract

The utility model discloses an auxiliary combustion system for solar-driven carbon capture and conversion. The auxiliary combustion 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. According to the utility model, solar energy is used as a unique driving energy source, so that the fuel consumption is reduced while the carbon emission is reduced, and the economic value is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to carbon dioxide capture and resource utilization technical field, concretely relates to a kind of solar-driven carbon capture and conversion auxiliary combustion system. BACKGROUND

[0002] In recent years, with the rapid growth of global economy, carbon dioxide emissions have risen sharply, posing a serious challenge to the ecological environment. In the face 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. Under this background, carbon dioxide capture and conversion into usable carbon resources has become a hot technical problem that the industry needs to solve.

[0003] Combustion is still the main technical way of carbon-based fuel utilization, and integrating carbon capture and conversion technology into the combustion system provides a potential approach to achieving carbon neutrality. The current carbon dioxide capture and conversion field still faces many technical problems and challenges. On the one hand, traditional capture and conversion processes often require additional power or heat input, which not only increases energy consumption but also may weaken the emission reduction effect due to carbon emissions in the energy production process. On the other hand, the storage and long-distance transportation of conversion products significantly increase economic costs and pose potential leakage risks, severely restricting their large-scale application.

[0004] Among the reduction products of carbon dioxide, alcohol substances have high energy density, are easy to transport and store, and have relatively clean combustion, etc., and can be directly applied to combustion systems, with great industrial application potential. However, compared with coal and gasoline, the lower calorific value of alcohol substances poses a challenge to the combustion stability of the burner, so when using alcohol as fuel, the operating conditions of the burner need to be finely regulated.

[0005] In summary, it has become an important topic to develop a new combustion system that is economical, environmentally friendly, and stable in combustion. SUMMARY

[0006] To address the shortcomings of the above-mentioned carbon capture and conversion technology when coupled with a combustion system, the utility model aims to provide a solar-driven carbon capture and conversion auxiliary combustion system. This system uses solar energy as the only driving energy and integrates carbon capture, conversion, and product separation functions to achieve efficient conversion and on-site utilization of carbon dioxide, thereby reducing the risk and cost of intermediate links. During operation, the alcohol substance produced in the cathode is injected back into the combustion system as auxiliary fuel, and the oxygen produced in the anode is precisely regulated for oxygen-enriched combustion, which reduces the consumption of main fuel, improves combustion efficiency, and reduces pollution.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is:

[0008] A solar-driven carbon capture and conversion auxiliary combustion system, comprising a hydrophobic membrane-based CO2 capture unit 1, a photo-electricity synergistic catalytic CO2 reduction unit 2, an oxygen-rich combustion adjustment unit 3 and an organic polymer membrane pervaporation dealcoholization unit 4;

[0009] The first port of the hydrophobic membrane-based CO2 capture unit 1 is connected to the photo-electricity synergistic catalytic CO2 reduction unit 2 for receiving flue gas in the atmosphere or generated by a combustion device, capturing CO2 by an absorbent after purification treatment, and outputting CO2 after gas-liquid separation; the anode end of the photo-electricity synergistic catalytic CO2 reduction unit 2 is connected to the oxygen-rich combustion adjustment unit 3, and the cathode end is connected to the organic polymer membrane pervaporation dealcoholization unit 4, for producing green electricity by photo-electricity conversion, synergistically reducing CO2 in an electric catalysis dominated and photo catalysis assisted mode, and generating anode product oxygen and cathode product alcohol; the oxygen-rich combustion adjustment unit 3 is connected to the second port of the hydrophobic membrane-based CO2 capture unit 1 for sending oxygen back to the combustion device for adjusting oxygen-rich combustion; and the organic polymer membrane pervaporation dealcoholization unit 4 is connected to the third port of the hydrophobic membrane-based CO2 capture unit 1 for separating alcohol from electrolyte by organic polymer membrane pervaporation technology and feeding back to the combustion device as auxiliary fuel.

[0010] Preferably, 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.

[0011] Flue gas generated in the atmosphere or by the combustion device 1-1 is input into the flue gas purification device 1-2 to remove impurities, the hydrophobic membrane-based CO2 capture device 1-3 is connected to the flue gas purification device 1-2, CO2 is captured by a hydrophobic membrane and an absorbent to form a gas-liquid mixture, the gas-liquid separator 1-4 is connected to the hydrophobic membrane-based CO2 capture device 1-3, the separated liquid phase 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 absorbent and then make it flow back to the hydrophobic membrane-based CO2 capture device 1-3, and the gas phase of the gas-liquid separator 1-4 is connected to the photo-electricity synergistic catalytic CO2 reduction unit 2 after passing through the first flow regulating valve 1-7.

[0012] Preferably, the absorbent of the hydrophobic membrane-based CO2 capture device 1-3 is an alcohol amine absorbent, a sterically hindered amine absorbent or an ionic liquid absorbent, and the absorbent can be regenerated by heating under solar drive, and the heating temperature ranges from 70°C to 130°C; the hydrophobic membrane of the hydrophobic membrane-based CO2 capture device 1-3 is a polypropylene membrane, a polytetrafluoroethylene membrane or a polyvinylidene fluoride membrane modified by super-hydrophobicity.

[0013] Preferably, the photoelectrocatalytic 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;

[0014] The photoelectrochemical cell 2-1 receives the output CO2 from the hydrophobic membrane-based CO2 capture unit 1, the second light collector 2-2 collects part of the sunlight which is directly delivered to the photoelectrochemical cell 2-1 as a light source, and another part is converted into electrical energy by the photovoltaic panel 2-3 and then delivered 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, and the collection tank 2-4 delivers the liquid phase 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-enriched 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.

[0017] The gas drying device 3-1 receives the anode product oxygen from the photoelectrocatalytic CO2 reduction unit 2, which is delivered to the oxygen storage tank 3-2 after drying, and the oxygen storage tank 3-2 delivers the oxygen back to the combustion equipment 1-1 of the hydrophobic membrane-based CO2 capture unit 1 for oxygen-enriched combustion through the third flow regulating valve 3-3.

[0018] Preferably, the organic polymer membrane pervaporation dealcoholization unit 4 comprises a third light collector 4-1, a second heater 4-2, an organic polymer membrane pervaporation dealcoholization 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 is connected to the photoelectrocatalytic CO2 reduction unit 2, and the liquid phase product is preheated by the solar energy collected by the light collector 4-1 and delivered to the organic polymer membrane pervaporation dealcoholization device 4-3, and the alcohol substance separated by the organic polymer membrane pervaporation dealcoholization device 4-3 is delivered to the alcohol storage tank 4-5 after being condensed by the condenser 4-4, and the alcohol storage tank 4-5 delivers the alcohol substance to the combustion equipment 1-1 of the hydrophobic membrane-based CO2 capture unit 1 as auxiliary fuel through the fourth flow regulating valve 4-6.

[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 dealcoholization device 4-3 is connected to the photoelectrochemical cell 2-1 of the photoelectrocatalytic CO2 reduction unit 2, which is used to recycle the electrolyte after alcohol separation to the photoelectrochemical cell 2-1.

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

[0023] The working method of the auxiliary combustion system for carbon capture and conversion driven by solar energy comprises the following steps:

[0024] The flue gas in the atmosphere or generated by the combustion equipment is purified and then enters the hydrophobic membrane-based CO2 capture unit 1, CO2 is captured by using the hydrophobic membrane and the absorption liquid, gas-liquid separation is performed after forming a gas-liquid mixture, the separated absorption liquid is regenerated under the heating of solar energy, and is recycled for CO2 capture, and the separated CO2 enters the photoelectricity collaborative catalytic CO2 reduction unit 2;

[0025] In the photoelectricity collaborative catalytic CO2 reduction unit 2, CO2 is reduced in an electric catalysis dominated and photo catalysis assisted collaborative catalytic mode by using green electric energy generated by photoelectric conversion, and anode product oxygen and cathode product alcohol are generated;

[0026] The anode product oxygen is sent back to the combustion equipment of the hydrophobic membrane-based CO2 capture unit 1 through the oxygen-rich combustion adjusting unit 3, and the oxygen-rich combustion condition of the combustion equipment is adjusted;

[0027] The cathode product alcohol is separated from the electrolyte through the organic polymer membrane pervaporation dealcoholization unit 4, and is then sent back to the combustion equipment of the hydrophobic membrane-based CO2 capture unit 1 as auxiliary fuel, and the electrolyte after alcohol separation is recycled to the photoelectricity collaborative catalytic CO2 reduction unit 2.

[0028] Compared with the prior art, the utility model has the following beneficial effects:

[0029] (1) The auxiliary combustion system for carbon capture and conversion driven by solar energy only relies on solar energy as the only driving energy, compared with the prior art, in the process of carbon capture and conversion, additional power or heat energy supply is often needed, the system avoids carbon emission caused by energy acquisition from the source, and therefore the emission reduction effect of the system is remarkably improved.

[0030] (2) The carbon capture, conversion and product separation functions are innovatively integrated, the on-site conversion and efficient utilization of carbon dioxide are realized, the difficulty that a large amount of carbon products is difficult to properly handle due to the complicated intermediate links in the traditional technology is solved, the loss of carbon dioxide in the conversion process is effectively reduced, in addition, through the integrated design, the additional costs of equipment maintenance, material transfer and potential technical risks and material loss risks caused by the complex process are prevented, and the overall operation cost is greatly reduced.

[0031] (3)system operation, the alcohol generated by the cathode can be directly used as auxiliary fuel back to the combustion equipment, and the oxygen generated by the anode can be accurately used for adjusting the oxygen-enriched combustion, unlike the prior art which cannot fully utilize the reaction products and causes resource waste, the utility model deeply excavates the product value, optimizes the combustion condition while reducing fuel consumption, and maximally improves the energy utilization efficiency.

[0032] (4)The utility model discloses a system respectively adopts carbon dioxide membrane absorption technology, carbon dioxide photoelectric catalytic reduction technology, organic polymer membrane pervaporation dealcoholization technology realizes carbon capture, conversion and product separation. BRIEF DESCRIPTION OF DRAWINGS

[0033] Fig. 1 It is the system structure diagram of the auxiliary combustion system of solar energy driving carbon capture and conversion of the utility model.

[0034] Fig. 2 It is the flow chart of the auxiliary combustion system of solar energy driving carbon capture and conversion of the utility model.

[0035] BRIEF DESCRIPTION OF DRAWINGS

[0036] 1, hydrophobic membrane-based CO2 capture unit;2, photoelectric synergistic catalytic CO2 reduction unit;3, oxygen-enriched combustion regulation unit;4, organic polymer membrane pervaporation dealcoholization unit;1-1, combustion equipment;1-2, flue gas purification device;1-3, hydrophobic membrane-based CO2 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 utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0038] The utility model provides a kind of auxiliary combustion system of solar energy driving carbon capture and conversion, such as Figs. 1-2As shown, the system includes a hydrophobic membrane-based CO2 capture unit 1, a photoelectrochemical co-catalytic CO2 reduction unit 2, an oxygen-enriched combustion regulation unit 3, and an organic polymer membrane pervaporation de-alcoholization unit 4. The first port of the hydrophobic membrane-based CO2 capture unit 1 is connected to the photoelectrochemical co-catalytic CO2 reduction unit 2, used to receive flue gas from the atmosphere or generated by the combustion equipment. After purification, CO2 is captured by an absorbent, and the CO2 after gas-liquid separation is output. The anode of the photoelectrochemical co-catalytic CO2 reduction unit 2 is connected to the oxygen-enriched combustion regulation unit 3, and the cathode is connected to the organic polymer membrane pervaporation de-alcoholization unit 4. This unit utilizes photo-electric conversion to produce green electricity, co-reducing CO2 in a mode dominated by electrocatalysis and assisted by photocatalysis, generating oxygen as the anode product and alcohols as the cathode product. The oxygen-enriched combustion regulation unit 3 is connected to the second port of the hydrophobic membrane-based CO2 capture unit 1, used to return oxygen to the combustion equipment to regulate oxygen-enriched combustion. The organic polymer membrane pervaporation de-alcoholization unit 4 is connected to the third port of the hydrophobic membrane-based CO2 capture unit 1, and is used to separate alcohols from the electrolyte through organic polymer membrane pervaporation technology and return them to the combustion equipment as auxiliary fuel.

[0039] The specific solar-driven assisted combustion methods for carbon capture and conversion are as follows:

[0040] In the hydrophobic membrane-based CO2 capture unit 1, the flue gas generated from the combustion of carbon-based fuel by the combustion device 1-1 first enters the flue gas purification device 1-2 to remove impurities such as large particulate matter, soluble pollutants, and nitrogen oxides. The gas is then cooled to room temperature and sent to the hydrophobic membrane-based CO2 capture device 1-3, which uses a 0.5 mol·L⁻¹ ppm gas purification unit. -1 A diethanolamine solution was used as the absorbent, and a polyvinylidene fluoride membrane modified by nano-SiO2 self-assembly was used as the hydrophobic membrane. The effective area of ​​the membrane module was 1 m². 2 The flue gas and absorbent flow counterclockwise on both sides of the membrane. Driven by the concentration gradient, CO2 diffuses through the membrane pores to the gas-liquid contact surface, forming a gas-liquid mixture with the absorbent and then entering the gas-liquid separator 1-4. The separated diethanolamine absorbent flows to the first heater 1-6. The first solar collector 1-5 collects solar energy to raise the temperature of the first heater 1-6 to 120°C, realizing the thermal regeneration of the absorbent. The absorbent flows back to the hydrophobic membrane-based CO2 capture device 1-3 for recycling, while CO2 enters the photoelectric co-catalytic CO2 reduction unit 2 through the first flow regulating valve 1-7.

[0041] The photoelectrochemical co-catalytic CO2 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. 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 photoelectrochemical cell 2-1 is a flow-type photoelectrochemical cell, which uses a highly active FeS2 / TiO2 catalyst supported on the gas diffusion electrode to achieve efficient photoelectrochemical co-catalytic reduction of CO2 to ethanol. The anode outlet of the photoelectrochemical cell 2-1 is connected to the oxygen-enriched combustion regulating unit 3, while the cathode outlet is connected to the collection tank 2-4. The liquid phase product containing ethanol is sent to the organic polymer membrane pervaporation and de-alcoholization 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 quickly dry the oxygen output from the photoelectric co-catalytic CO2 reduction unit 2. The dried oxygen is stored in the oxygen storage tank 3-2 and, according to the combustion conditions, is fed back to the combustion device 1-1 of the hydrophobic membrane-based CO2 capture unit 1 at an appropriate flow rate through the third flow regulating valve 3-3 for oxygen-enriched combustion.

[0043] In the organic polymer membrane pervaporation dealcoholization unit 4, the second heater 4-2 is connected to the photoelectric co-catalytic CO2 reduction unit 2. Solar energy collected by the third collector 4-1 preheats the liquid-phase product to 60°C, which is then sent to the organic polymer membrane pervaporation dealcoholization device 4-3. The device 4-3 uses an ultrathin polydimethylsiloxane membrane modified with a zeolite imidazole ester framework, with an effective membrane area of ​​0.5 m². 2 The separated ethanol is condensed by condenser 4-4 and then transported to alcohol storage tank 4-5. Finally, according to the combustion conditions, it is transported to the combustion device 1-1 of hydrophobic membrane-based CO2 capture unit 1 via the fourth flow regulating valve 4-6 to serve as auxiliary fuel. At the same time, the electrolyte after alcohol removal is returned to the photoelectrochemical cell 2-1 of photoelectrochemical co-catalytic CO2 reduction unit 2 for recycling through pipeline.

[0044] After multiple tests and verifications, the hydrophobic membrane-based CO2 capture device 1-3 can achieve a CO2 capture efficiency of 40% to 60% in motor vehicle exhaust, the photoelectrochemical cell 2-1 has a Faraday efficiency of 25% to 40% in reducing alcohols, and the organic polymer membrane pervaporation de-alcoholization device 4-3 has a separation efficiency of 80% to 95% for alcohols. Overall, it improves the combustion efficiency of the combustion system by 5% to 15%, reduces fuel consumption by 5% to 10%, and after oxygen-enriched combustion adjustment, the combustion of alcohols as auxiliary fuel further reduces carbon emissions, with no significant negative impact on combustion performance.

[0045] The above merely is the preferred implementation form of the present application, and it should be noted that for the ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A solar-driven carbon capture and conversion auxiliary combustion system, characterized in that, The system comprises a hydrophobic membrane-based CO2 capture unit (1), a photo-electricity synergistic catalytic CO2 reduction unit (2), an oxygen-rich 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 with the photo-electricity synergistic catalytic CO2 reduction unit (2) for receiving flue gas generated by combustion equipment or in the atmosphere, capturing CO2 by absorption liquid after purification treatment, and outputting CO2 after gas-liquid separation; the anode end of the photo-electricity synergistic catalytic CO2 reduction unit (2) is connected with the oxygen-rich combustion adjustment unit (3), and the cathode end is connected with the organic polymer membrane pervaporation dealcoholization unit (4) for producing green electricity by photo-electricity conversion, synergistically reducing CO2 in an electric catalysis dominated and photo catalysis assisted mode, and generating anode product oxygen and cathode product alcohol; The oxygen-rich combustion adjustment unit (3) is connected with the second port of the hydrophobic membrane-based CO2 capture unit (1) for sending oxygen back to the combustion equipment for adjusting oxygen-rich combustion; and the organic polymer membrane pervaporation dealcoholization unit (4) is connected with the third port of the hydrophobic membrane-based CO2 capture unit (1) for separating alcohol from electrolyte by organic polymer membrane pervaporation technology and feeding back to the combustion equipment as auxiliary fuel.

2. The auxiliary combustion system for solar-driven carbon capture and conversion of claim 1, wherein, The hydrophobic membrane-based CO2 capture unit (1) comprises a combustion equipment (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 generated by the combustion equipment (1-1) or in the atmosphere is input into the flue gas purification device (1-2) to remove impurities; the hydrophobic membrane-based CO2 capture device (1-3) is connected with the flue gas purification device (1-2) to capture CO2 by hydrophobic membrane and absorption liquid to form a gas-liquid mixture; the gas-liquid separator (1-4) is connected with the hydrophobic membrane-based CO2 capture device (1-3) to separate the liquid phase and feed it 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 feed it back to the hydrophobic membrane-based CO2 capture device (1-3); the gas phase of the gas-liquid separator (1-4) is connected to the photo-electricity synergistic catalytic CO2 reduction unit (2) after passing through the first flow regulating valve (1-7).

3. The auxiliary combustion system for solar-driven carbon capture and conversion of claim 2, wherein, The absorption liquid of the hydrophobic membrane-based CO2 capture device (1-3) is alcohol amine absorption liquid, steric hindrance amine absorption liquid or ionic liquid absorption liquid, and the absorption liquid can be regenerated by heating under solar drive, and the heating temperature ranges from 70℃ to 130℃; the hydrophobic membrane of the hydrophobic membrane-based CO2 capture device (1-3) is a polypropylene membrane, a polytetrafluoroethylene membrane or a polyvinylidene fluoride membrane modified by super-hydrophobicity.

4. The auxiliary combustion system for solar-driven carbon capture and conversion of claim 1, wherein, The photo-electricity synergistic catalytic CO2 reduction unit (2) comprises a photo-electrochemical 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 delivered to the photoelectrochemical cell (2-1) as a light source, and another part is converted into electrical energy by the photovoltaic panel (2-3) and then delivered 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 adjustment unit (3), the cathode outlet of the photoelectrochemical cell (2-1) is connected to the collection tank (2-4), and the collection tank (2-4) sends the liquid phase product to the organic polymer membrane pervaporation dealcoholization unit (4) through the second flow regulating valve (2-5).

5. The auxiliary combustion system for solar-driven carbon capture and conversion of claim 4, wherein, The photoelectrochemical cell (2-1) is a flow-type photoelectrochemical cell or a membrane-electrode assembly-type photoelectrochemical cell.

6. The auxiliary combustion system for solar-driven carbon capture and conversion of claim 1, wherein, The oxygen-enriched combustion adjustment unit (3) includes 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 photoelectrocatalytic CO2 reduction unit (2), dries it, and then delivers it to the oxygen storage tank (3-2), which returns the oxygen to the combustion equipment (1-1) of the hydrophobic membrane-based CO2 capture unit (1) for oxygen-enriched combustion through the third flow regulating valve (3-3).

7. The auxiliary combustion system for solar-driven carbon capture and conversion of claim 1, wherein, The organic polymer membrane pervaporation dealcoholization unit (4) includes a third light collector (4-1), a second heater (4-2), an organic polymer membrane pervaporation dealcoholization 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 photoelectrocatalytic CO2 reduction unit (2), and the liquid phase product is preheated by the solar energy collected by the third light collector (4-1) and sent to the organic polymer membrane pervaporation dealcoholization device (4-3), the alcohol separated from the first outlet of the organic polymer membrane pervaporation dealcoholization device (4-3) is condensed by the condenser (4-4) and then delivered to the alcohol storage tank (4-5), and the alcohol storage tank (4-5) delivers the alcohol to the combustion equipment (1-1) of the hydrophobic membrane-based CO2 capture unit (1) as auxiliary fuel through the fourth flow regulating valve (4-6); the second outlet of the organic polymer membrane pervaporation dealcoholization device (4-3) is connected to the photoelectrochemical cell (2-1) of the photoelectrocatalytic CO2 reduction unit (2) for recycling the electrolyte after alcohol separation to the photoelectrochemical cell (2-1).

8. The auxiliary combustion system for solar-driven carbon capture and conversion of claim 7, wherein, The preheating temperature of the second heater (4-2) ranges from 30°C to 75°C.

9. The auxiliary combustion system for solar-driven carbon capture and conversion of claim 7, wherein, The organic polymer membrane in the organic polymer membrane pervaporation dealcoholization device (4-3) is a polydimethylsiloxane membrane, a polytrimethylpropyne membrane, a polyether block amide membrane, or a composite modified membrane thereof.

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