A carbon monoxide production system coupled with internal circulation of electrolyzed water

Abstract

The present invention relates to the technical field of carbon dioxide capture, utilization and storage, and specifically to a carbon monoxide preparation system coupled with electrolytic water internal circulation. The specific technical scheme is: a carbon monoxide preparation device coupled with electrolytic water internal circulation, comprising an in-situ combustion reactor, the combustion reactor is sealed with a water storage pipe all around, coal is placed inside the combustion reactor, a carbon monoxide coarse screen pipe is arranged on the top of the coal, a flame nozzle is arranged at the bottom of the coal, the flame nozzle is connected to the hydrogen injection pipe, an oxygen nozzle is arranged on the side of the flame nozzle, and nozzles are respectively arranged on both sides of the coal, one end of the nozzle penetrates and extends out of the water storage pipe, and the end of the nozzle extending out of the water storage pipe is respectively located in the first mixing domain and the second mixing domain. The present invention solves the problems of low carbon dioxide conversion efficiency and storage difficulties.

Description

Technical Field

[0001] The invention relates to the technical field of carbon dioxide capture, utilization and storage, and in particular to a carbon monoxide preparation system coupled with electrolytic water internal circulation. Background Art

[0002] Coal consumption still dominates energy consumption. Underground Coal Gasification (UCG) technology can burn coal underground and produce usable fuel through a series of chemical reactions of coal. This method is expected to open up a new way to effectively supply natural gas.

[0003] However, UCG has not yet been industrialized due to major bottlenecks such as unstable gas production, unstable calorific value and environmental pollution. Studies have shown that furnace cavity collapse, groundwater influx, gas leakage and other problems are the main direct causes of unstable gas production, unstable gas calorific value and environmental pollution. The root cause is the rupture and instability of the surrounding rock during the combustion process of the gasifier. A large amount of carbon dioxide produced during the combustion process may be discharged into the atmosphere, causing air pollution, and the heat from the combustion often cannot be collected and utilized, resulting in energy waste. Due to the presence of high temperature, the activity of the catalyst in solid oxide water electrolysis is significantly improved, which reduces the energy consumption of water decomposition, and can efficiently and quickly produce hydrogen and oxygen. The efficiency of high-temperature water electrolysis can be as high as 90%. In addition to low energy consumption, solid oxide hydrolysis is not easy to corrode, and the distribution and control requirements of the fluid are not high. However, high-temperature water electrolysis requires additional energy to ensure high-temperature operating conditions, thereby increasing the overall energy consumption. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a carbon monoxide preparation system coupled with an internal circulation of electrolyzed water, which solves the problems of low carbon dioxide conversion efficiency and storage difficulties.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] The present invention discloses a carbon monoxide preparation system coupled with an internal circulation of electrolytic water, comprising an in-situ combustion reactor, wherein the in-situ combustion reactor is sealed with a water storage pipe on all sides, coal is placed inside the in-situ combustion reactor, a carbon monoxide coarse screen pipe is arranged on the top of the coal, a flame nozzle is arranged on the bottom of the coal, the flame nozzle is connected to a hydrogen injection pipe, an oxygen nozzle is arranged on the side of the flame nozzle, nozzles are respectively arranged on both sides of the coal, one end of the nozzle penetrates and extends out of the water storage pipe, and the ends of the nozzles extending out of the water storage pipe are respectively located in a first mixing domain and a second mixing domain.

[0007] Preferably, a carbon dioxide injection pipe and an oxygen injection pipe are respectively provided in the first mixing domain and the second mixing domain, the carbon dioxide injection pipe and the oxygen injection pipe are arranged separately, and the oxygen injection pipe is arranged close to the oxygen nozzle.

[0008] Preferably, a stirrer is disposed at the bottom of each of the first mixing zone and the second mixing zone, and the stirrer is disposed beside the oxygen injection pipe.

[0009] Preferably, the oxygen nozzle is arranged to penetrate a water storage pipe, and the water storage pipe is provided with a water outlet pipe and a water injection pipe.

[0010] Preferably, a carbon monoxide purification device is provided at the outlet of the carbon monoxide coarse sieve tube, and the carbon monoxide coarse sieve tube is connected to the reaction domain in the carbon monoxide purification device, the two sides of the reaction domain near the bottom are respectively connected to a mixture flow chamber, the outside of the mixture flow chamber is connected to a carbon powder storage chamber, the outside of the carbon powder storage chamber is connected to a blowing port, the top of the reaction domain is connected to a precipitation domain, and the top of the precipitation domain is connected to a carbon monoxide fine sieve tube.

[0011] Preferably, the carbon monoxide purification device includes a symmetrically arranged lining structure, which is L-shaped, and a re-reaction domain is formed at the center of the lining structure; a middle lining structure is fitted on the outer side of the lining structure, and the bottom of the middle lining structure is separated from the horizontal part of the lining structure to form a carbon powder storage chamber, which is connected to the mixture flow chamber on the lining structure, and a precipitation domain is formed between the middle lining structures; an outer lining structure is fitted on the outer side of the middle lining structure, and the blowing port on the outer lining structure is connected to the carbon powder storage chamber.

[0012] Preferably, the blowing port is located lower than the carbon powder storage chamber, the mixture flow chamber is located lower than the carbon powder storage chamber, and the mixture flow chamber is located lower than the re-reaction zone.

[0013] Preferably, a solid oxide water electrolysis device is arranged between the water outlet pipe and the water injection pipe, and the solid oxide water electrolysis device includes an air injection pipe and a water vapor pipe respectively penetrating the water outlet pipe, the water vapor pipe is connected to a heat recovery system, the other end of the heat recovery system is connected to the water injection pipe, the water vapor pipe is connected to a mixed gas pipe through a branch pipe and the outlet end of the air injection pipe, the mixed gas pipe is connected to a solid oxide battery, and the outlet ends of the solid oxide battery are respectively connected to the water injection pipe and the oxygen nozzle.

[0014] Preferably, the water injection pipe is connected to a mixture pipe near its top end, and the other end of the heat recovery system is also connected to a steam pipe. The steam pipe and the mixture pipe are connected to a storage tank, and the storage tank is connected to the water injection pipe through a water circulation pipe. A water pressure pump is provided on the water circulation pipe. The top of the storage tank is connected to the hydrogen injection pipe.

[0015] Preferably, the hydrogen injection pipe is connected to a hydrogen shunt pipe, the hydrogen shunt pipe is connected to a compressor, the compressor is connected to a water vapor circulation pipe, and both ends of the water vapor circulation pipe are respectively connected to a water injection pipe and a water vapor pipeline.

[0016] The present invention has the following beneficial effects:

[0017] The present invention provides an efficient carbon monoxide preparation system coupled with electrolytic water internal circulation technology. The system constructs a combustion reactor in situ in a coal mine, and continuously fills the in-situ combustion reactor with carbon dioxide and oxygen to cause incomplete combustion of carbon in the in-situ combustion reactor, thereby generating a series of physical and chemical reactions to efficiently convert into carbon monoxide, and then the carbon monoxide is further purified through a carbon monoxide coarse screen tube, thereby realizing efficient conversion of carbon dioxide, and after conversion, it is collected as combustible carbon monoxide for reuse; at the same time, the system can recycle the heat generated in the in-situ combustion reactor, and the recycled heat will be passed through a high-temperature solid oxide water electrolysis system to realize the internal circulation of the entire system. The system can help solve a series of scientific problems such as low carbon dioxide conversion efficiency and difficult storage, not only realizing clean mining of underground coal mines, but also realizing efficient utilization and sustainable development of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of a carbon monoxide purification device;

[0020] Figure 3 It is a schematic diagram of a solid oxide water electrolysis device;

[0021] In the figure: 1, water outlet pipe; 2, surrounding rock; 3, carbon dioxide injection pipe; 4, first mixing zone; 5, nozzle; 6, oxygen injection pipe; 7, agitator; 8, water storage pipe; 9, oxygen nozzle; 10, water injection pipe; 11, in-situ combustion reactor; 12, flame nozzle; 13, hydrogen injection pipe; 14, spark plug; 15, second mixing zone; 16, coal; 17, carbon monoxide coarse screen pipe; 18, inner lining structure; 19, outer lining structure; 20, air blowing port; 21, carbon powder storage chamber; 22. Mixture flow chamber; 23. Re-reaction zone; 24. Middle lining structure; 25. Precipitation zone; 26. Carbon monoxide fine screen tube; 27. Air injection pipe; 28. Heat recovery system; 29. ​​Water vapor pipeline; 30. Mixed gas pipeline; 31. Negative electrode; 32. Solid oxide battery; 33. Positive electrode; 34. Water vapor circulation pipe; 35. Hydrogen diversion pipe; 36. Water circulation pipe; 37. Water pressure pump; 38. Compressor; 39. Mixture pipeline; 40. Storage tank. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0024] refer to Figure 1-Figure 3The present invention discloses a carbon monoxide preparation system coupled with an electrolytic water internal circulation, comprising an in-situ combustion reactor 11, wherein the center of the in-situ combustion reactor 11 is a coal mine goaf, and a water storage pipe 8 is sealed around the in-situ combustion reactor 11. The water storage pipe 8 should be made of corrosion-resistant, high-temperature-resistant and heat-conductive materials, such as steel. Coal 16 is placed inside the in-situ combustion reactor 11, and specifically, the coal 16 is placed in the goaf. A carbon monoxide coarse screen pipe 17 is arranged on the top of the coal 16, and a flame nozzle 12 is arranged at the bottom of the coal 16. The flame nozzle 12 and the hydrogen injection pipe 13 can be connected by welding. The bottom of the flame nozzle 12 is a spark plug 14, and an oxygen nozzle 9 is arranged on the side of the flame nozzle 12, that is, there is an oxygen nozzle 9 in the area where the flame nozzle 12 is located, and the oxygen nozzle 9 is arranged through the water storage pipe 8. Nozzles 5 are arranged on both sides of the coal 16, and there are multiple nozzles, which are distributed in the longitudinal direction. One end of the nozzle 5 extends through the water storage pipe 8, and the other end of the nozzle 5 extending out of the water storage pipe 8 is respectively located in the first mixing area 4 and the second mixing area 15. The first mixing area and the second mixing area are the remaining areas of the goaf, and generally no additional excavation is performed to build the system. It should be noted that the coal is fixed at the side and the bottom, and the coal can be transported to make the coal fall as a whole, and the coal can be supplemented through the carbon monoxide coarse screen pipe 17. The goaf is surrounded by surrounding rock 2, and two oxygen nozzles 9 are provided, which are respectively arranged on both sides of the flame nozzle 12. The oxygen nozzle 9 passes through the water storage pipe 8, the first mixing area 4 and the surrounding rock 2, and passes through the water storage pipe 8, the second mixing area 15 and the surrounding rock 2. The gas pressure of the first mixing area 4 and the second mixing area 15 should be maintained within a certain range to ensure that the gas in the first mixing area 4 and the second mixing area 15 can spontaneously flow through the nozzle to the goaf. The oxygen sprayed by the oxygen nozzle 9 should be injected according to a certain proportion, and it is only necessary to ensure that the oxygen can be fully utilized at the position of the flame nozzle 12.

[0025] Further, the first mixing area 4 and the second mixing area 15 are respectively provided with a carbon dioxide injection pipe 3 and an oxygen injection pipe 6, the carbon dioxide injection pipe 3 and the oxygen injection pipe 6 are arranged separately, and the oxygen injection pipe 6 is arranged near the oxygen nozzle 9. It should be noted that the carbon dioxide injection pipe 3 is preferably arranged on the upper side of the first and second mixing areas, and the carbon dioxide injection pipe 3 is arranged through the surrounding rock 2, and the oxygen injection pipe 6 is preferably arranged on the lower side of the first and second mixing areas, and the oxygen injection pipe 6 is arranged through the surrounding rock 2. The carbon dioxide injection pipe and the oxygen injection pipe should be as far away as possible in the vertical direction. The oxygen injection pipe 6 and the flame nozzle 12 should be as close as possible. The oxygen injection pipe 6 and the flame nozzle 12 should be as close as possible. The flame nozzle 12 requires that its specific surface area is large enough to ensure sufficient combustion of the flame. The carbon dioxide injection pipe 3 and the oxygen injection pipe 6 need to be injected in a certain proportion when injecting gas respectively to ensure incomplete combustion of coal.

[0026] Furthermore, a stirrer 7 is provided at the bottom of the first mixing area 4 and the second mixing area 15, respectively, and the stirrer is provided beside the oxygen injection pipe 6. The oxygen injection pipe and the stirrer should be ensured to be as close as possible.

[0027] Furthermore, a water outlet pipe 1 and a water injection pipe 10 are provided on the water storage pipe 8 . Specifically, the water outlet pipe 1 is provided on the upper side of the water storage pipe 8 , and the water injection pipe 10 is provided on the lower side of the water storage pipe 8 .

[0028] Furthermore, a carbon monoxide purification device is provided at the outlet of the carbon monoxide coarse screen tube 17, and the carbon monoxide coarse screen tube 17 is connected to a reaction domain 23 in the carbon monoxide purification device, and the reaction domain 23 is connected to a mixture flow chamber 22 on both sides near its bottom, and the outside of the mixture flow chamber 22 is connected to a carbon powder storage chamber 21, and the outside of the carbon powder storage chamber 21 is connected to a blowing port 20, and the top of the reaction domain 23 is connected to a precipitation domain 25, and the top of the precipitation domain 25 is connected to a carbon monoxide fine screen tube 26.

[0029] Specifically: the carbon monoxide purification device is mainly assembled by an inner lining structure, an outer lining structure and a middle lining structure, specifically including a symmetrically arranged inner lining structure 18, the inner lining structure 18 is L-shaped, and a re-reaction zone 23 is formed at the center of the inner lining structure 18; the outer side of the inner lining structure 18 is fitted with a middle lining structure 24, the bottom of the middle lining structure 24 is separated from the horizontal part of the inner lining structure 18, forming a carbon powder storage chamber 21, which is connected to the mixture flow chamber 22 on the inner lining structure 18, and the middle lining structure 24 forms a precipitation zone 25 together with the inner lining structure 18; the outer side of the middle lining structure 24 is fitted with an outer lining structure 19, and the blowing port 20 on the outer lining structure 19 is connected to the carbon powder storage chamber 21. The upper opening of the precipitation zone is smaller, and the lower opening is larger. The bottom end of the carbon monoxide coarse screen pipe 17 is wider, and its width is slightly larger than the width of the coal, and the top of the carbon monoxide coarse screen pipe is narrower. The joints and interfaces between the outer lining structure, the middle lining structure and the inner lining structure should ensure good sealing, that is, there is basically no gas leakage.

[0030] Furthermore, the blowing port 20 is located lower than the carbon powder storage chamber 21, so that all carbon powder can be blown away when blowing air from the blowing port. The mixture flow chamber 22 is located lower than the carbon powder storage chamber 21, so that only the blown carbon powder can flow through the mixture flow chamber. The mixture flow chamber 22 is located lower than the re-reaction zone 23, so that the mixture takes a longer time to pass through the re-reaction zone.

[0031] Furthermore, a solid oxide water electrolysis device is provided between the water outlet pipe 1 and the water injection pipe 10, and the solid oxide water electrolysis device includes an air injection pipe 27 and a water vapor pipe 29 respectively penetrating the water outlet pipe 1, and the water vapor pipe and the air injection pipe are both independent pipes. The water vapor pipe 29 is connected to a heat energy recovery system 28, that is, the water vapor pipe 29 penetrates the water outlet pipe 1 and flows into the heat energy recovery system 28, and the heat energy recovery system 28 can provide heat energy utilization, which generally needs to be utilized in a targeted manner, including providing floor heating, washing clothes and cooking, etc. The other end of the heat recovery system 28 is connected to the water injection pipe 10, and the water vapor pipe 29 is connected to the mixed gas pipe 30 through the branch pipe and the outlet end of the air injection pipe 27. The air of the air injection pipe 27 and the water vapor of the water vapor pipe 29 flow through the water outlet pipe 1 and heat up before flowing into the mixed gas pipe 30. The mixed gas pipe 30 is connected to a solid oxide battery 32, and the outlet end of the solid oxide battery 32 is connected to the water injection pipe 10 and the oxygen nozzle 9 respectively. It should be noted that: the upper end of the solid oxide battery 32 is a negative electrode 31, and the lower end is a positive electrode 33. The outlet end of the solid oxide battery 32 is connected to the water injection pipe 10 through another mixed gas pipe 30. Oxygen is generated at the position of the positive electrode 33, and hydrogen is generated at the position of the negative electrode 31. The oxygen enters the oxygen nozzle 9, and the hydrogen enters the water injection pipe 10 through the right mixed gas pipe 30 of the solid oxide battery 32 for cooling treatment.

[0032] Furthermore, the water injection pipe 10 is connected to a mixture pipe 39 near its top, and the middle position of the other end of the heat recovery system 28 is connected to a water vapor pipe 29, and the water vapor pipe 29 and the mixture pipe 39 are connected to a storage tank 40, and the storage tank 40 is connected to the water injection pipe 10 through a water circulation pipe 36, and the water circulation pipe 36 is connected to a position near the bottom of the water injection pipe 10, and a water pressure pump 37 is provided on the water circulation pipe 36, and the top of the storage tank 40 is connected to the hydrogen injection pipe 13. The hydrogen injection pipe 13 is connected to a hydrogen shunt pipe 35, and the hydrogen shunt pipe 35 is connected to a compressor 38, and the compressor 38 is connected to a water vapor circulation pipe 34, and the two ends of the water vapor circulation pipe 34 are respectively connected to the water injection pipe 10 and the water vapor pipe 29. It should be noted that the reason for the hydrogen diversion pipe 35 is that not so much hydrogen is needed and internal circulation is required; at the same time, the hydrogen is impure and can be brought into the circulation through the hydrogen diversion pipe 35. The flow direction of the water vapor circulation pipe 34 is from right to left. The water temperature at the position of the water injection pipe 10 is relatively low, and then it flows into the water vapor pipe 29 through the water vapor circulation pipe 34. The water vapor pipe 29 is heated by the liquid in the water outlet pipe 1 in the water outlet pipe 1. The heated water flows into the mixed gas pipe 30 through the branch pipe to start electrolysis. The electrolysis efficiency of water with higher temperature is also higher. The heated water vapor flows into the heat energy recovery and utilization system 28.

[0033] Working principle:

[0034] First, the remaining coal in the goaf of the coal mine is placed in the in-situ combustion reactor 11, and then the carbon dioxide injection pipe 3 and the oxygen injection pipe 6 begin to inject carbon dioxide and oxygen in a certain proportion respectively. Carbon dioxide begins to fall due to gravity, while oxygen is lighter than carbon dioxide and begins to rise. In order to mix the gas more evenly, the agitator 7 of the first mixing domain 4 and the second mixing domain 15 begins to stir, and the carbon dioxide and oxygen are more evenly distributed in the gas mixture after stirring. At this time, because the first mixing domain 4 and the second mixing domain 15 are under the action of the mixed gas pressure, they are spontaneously injected into the in-situ combustion reactor 11 through the nozzle 5. Then the oxygen nozzle 9 starts to spray oxygen, the hydrogen injection pipe 13 starts to spray hydrogen, and then the spark plug 14 ignites, and the hydrogen and oxygen begin to react chemically at the position of the flame nozzle to burn. The chemical formula of the reaction is: 2H 2 +O 2 =2H 2 O, the heat generated causes the coal to undergo an ignition reaction to produce secondary combustion. Since the gas in the in-situ combustion reactor 11 is mixed with a certain ratio of carbon dioxide and oxygen, the coal inside the in-situ combustion reactor 11 begins to undergo an incomplete combustion reaction, and its chemical reaction equation is: C+CO 2=2CO (incomplete reaction), incomplete reaction requires a high temperature chemical reaction environment, oxygen and other coals are burned to provide temperature. Since the temperature inside the in-situ combustion reactor 11 is very high, the water storage pipe 8 is used to recycle the heat.

[0035] At the beginning, cold water is injected from the water injection pipe 10, and then the cold water flows along the water storage pipe 8 and is heated, and then flows out through the water outlet pipe 1. At this time, the water flow temperature at the water outlet 1 is relatively high. Due to the temperature inside the in-situ combustion reactor 11, the solid and the gas react chemically and expand, and the gas pressure inside the in-situ combustion reactor 11 continues to increase. The carbon monoxide gas is relatively light and is mainly located at the upper part of the in-situ combustion reactor 11. Under the action of the pressure difference, it begins to flow through the carbon monoxide primary screening tube 17. It is worth noting that the gas flowing through the carbon monoxide primary screening tube 17 at this time is mainly carbon monoxide and the mixed gas (oxygen, carbon dioxide, etc.) in the in-situ combustion reactor 11, so the carbon monoxide gas is not pure enough.

[0036] After the carbon monoxide gas and the mixed gas flow through the carbon monoxide primary screening tube 17, they will stay in the re-reaction zone 23, and then be inflated (pure carbon monoxide gas) at the blowing port. When the gas flows through the carbon powder storage chamber 21, the carbon powder will be blown away. At this time, the gas mixed with carbon monoxide and carbon powder comes to the mixture flow chamber 22 for further mixing. Finally, the mixed gas continues to react chemically in the re-reaction zone 23. The chemical reaction equation is: C+CO 2 =2CO (incomplete reaction), it should be noted that at this time, the temperature of the gas coming out of the carbon monoxide coarse screen tube 17 is high enough to ensure the chemical reaction in the re-reaction area 23. The gas after the chemical reaction in the re-reaction area 23 will flow through the precipitation area 25, and the shape of the precipitation area 25 is narrow at the top and wide at the bottom, which means that the unreacted carbon powder will continue to accumulate on the lower boundary of the precipitation area 25 under the action of gravity, which can ensure the continuous re-reaction of the gas, and the relatively pure carbon monoxide will flow through the precipitation area 25 into the carbon monoxide fine screen tube 26. At this time, the gas obtained from the carbon monoxide fine screen tube 26 is the pure carbon monoxide gas obtained by efficient conversion.

[0037] Taking into account that the preparation of hydrogen and oxygen is relatively difficult, and it is not desired that the heat generated in the entire system be wasted, the present invention designs a solid oxide water electrolysis device coupled with electrolytic water internal circulation technology, which can not only meet the self-circulation of hydrogen and oxygen in the entire system, but also meet the reasonable utilization of the heat generated by the in-situ combustion reactor 11.

[0038] The temperature of the water outlet pipe 1 is relatively high. The water outlet pipe 1 contains an air injection pipe 27 and a water vapor pipe 29, and the air flows through the air injection pipe 27. After the water vapor flows through the water vapor pipe 29, it stays in the water outlet pipe 1 for a certain period of time. The purpose of staying is to additionally heat the water vapor and the air. Then the water vapor flows through the heat energy recovery system 28. After the heat energy of the water vapor is utilized, it begins to liquefy. The liquefied water flows through the water injection pipe 10 to be further cooled, and then is stored in the storage tank 40. When the water in the storage tank 40 accumulates to a certain extent, under the action of the water pressure pump 37, the water will be injected into the water injection pipe 10 along the water circulation pipe 36 to realize circulation. The water at the position of the water injection pipe 10 can flow to the water vapor pipe 29 through the water vapor circulation pipe 34 and be heated by the water in the water outlet pipe 1. Such a design realizes the circulation of water vapor.

[0039] After the water vapor in the water vapor pipe 29 is heated, it is mixed with the air in the air injection pipe 27 in the mixed gas pipe 30 through the branch pipe, and then flows through the solid oxide battery 32. Under the action of the current, the solid oxide battery 32 generates oxygen at the position of the positive electrode 33 and hydrogen at the position of the negative electrode 31. The oxygen enters the oxygen nozzle 9, and the hydrogen enters the water injection pipe 10 through the mixed gas pipe 30 on the right side of the solid oxide battery 32 for cooling treatment. The hydrogen after cooling treatment flows through the storage tank 40 through the mixture pipe 39. A hydrogen injection pipe 13 is installed above the storage tank 40. At this time, the hydrogen is released in the hydrogen injection pipe 13 due to the action of gravity. At this time, the oxygen, hydrogen, etc. required in the whole system realize self-circulation. The chemical reaction occurring at the positive electrode 33 is: 2O 2- =O 2 +2e - (Under electrolysis conditions), the chemical reaction occurring at the negative electrode 31 is: H 2 O+2e - =H 2 +O 2- (Under electrolytic conditions).

[0040] The present invention can not only realize the efficient conversion of carbon dioxide, but also recycle the heat generated in the in-situ combustion reactor. The recycled heat will be passed through the high-temperature solid oxide water electrolysis system to realize the internal circulation of the entire system. The device can help solve a series of scientific problems such as low carbon dioxide conversion efficiency and storage difficulties, and not only realize the clean mining of underground coal mines, but also realize the efficient utilization and sustainable development of energy.

[0041] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A carbon monoxide production system coupled with an internal circulation of electrolyzed water, comprising an in-situ combustion reactor (11), characterized in that: The in-situ combustion reactor (11) is sealed with a water storage pipe (8) on all sides, coal (16) is placed inside the in-situ combustion reactor (11), a carbon monoxide coarse screen pipe (17) is arranged on the top of the coal (16), a flame nozzle (12) is arranged at the bottom of the coal (16), the flame nozzle (12) is connected to the hydrogen injection pipe (13), an oxygen nozzle (9) is arranged on the side of the flame nozzle (12), and nozzles (5) are respectively arranged on both sides of the coal (16), one end of the nozzle (5) penetrates and extends out of the water storage pipe (8), and the end of the nozzle (5) extending out of the water storage pipe (8) is respectively located in the first mixing area (4) and the second mixing area (15); A carbon monoxide purification device is provided at the outlet of the carbon monoxide coarse sieve tube (17); the carbon monoxide coarse sieve tube (17) is connected to a reaction zone (23) in the carbon monoxide purification device; the reaction zone (23) is connected to a mixture flow chamber (22) on both sides near the bottom thereof; the outside of the mixture flow chamber (22) is connected to a carbon powder storage chamber (21); the outside of the carbon powder storage chamber (21) is connected to a blowing port (20); the top of the reaction zone (23) is connected to a precipitation zone (25); the top of the precipitation zone (25) is connected to a carbon monoxide fine sieve tube (26); The carbon monoxide purification device comprises a symmetrically arranged inner lining structure (18), wherein the inner lining structure (18) is L-shaped, and a re-reaction zone (23) is formed at the center of the inner lining structure (18); a middle lining structure (24) is arranged on the outer side of the inner lining structure (18), and the bottom of the middle lining structure (24) is separated from the horizontal part of the inner lining structure (18) to form a carbon powder storage chamber (21) which is connected to a mixture flow chamber (22) on the inner lining structure (18), and a precipitation zone (25) is formed between the middle lining structures (24); an outer lining structure (19) is arranged on the outer side of the middle lining structure (24), and a blowing port (20) on the outer lining structure (19) is connected to the carbon powder storage chamber (21).

2. A carbon monoxide production system coupled with internal circulation of electrolyzed water according to claim 1, characterized in that: A carbon dioxide injection pipe (3) and an oxygen injection pipe (6) are respectively arranged in the first mixing zone (4) and the second mixing zone (15); the carbon dioxide injection pipe (3) and the oxygen injection pipe (6) are arranged separately, and the oxygen injection pipe (6) is arranged close to the oxygen nozzle (9).

3. A carbon monoxide production system coupled with internal circulation of electrolyzed water according to claim 1 or 2, characterized in that: A stirrer (7) is provided at the bottom of each of the first mixing zone (4) and the second mixing zone (15), and the stirrer is arranged beside the oxygen injection pipe (6).

4. A carbon monoxide production system coupled with internal circulation of electrolyzed water according to claim 3, characterized in that: The oxygen nozzle (9) is arranged to penetrate the water storage pipe (8), and the water storage pipe (8) is provided with a water outlet pipe (1) and a water injection pipe (10).

5. A carbon monoxide production system coupled with internal circulation of electrolyzed water according to claim 1, characterized in that: The blowing port (20) is located lower than the carbon powder storage chamber (21), the mixture flow chamber (22) is located lower than the carbon powder storage chamber (21), and the mixture flow chamber (22) is located lower than the re-reaction zone (23).

6. A carbon monoxide production system coupled with internal circulation of electrolyzed water according to claim 4, characterized in that: A solid oxide water electrolysis device is provided between the water outlet pipe (1) and the water injection pipe (10), and the solid oxide water electrolysis device comprises an air injection pipe (27) and a water vapor pipe (29) respectively penetrating the water outlet pipe (1), the water vapor pipe (29) is connected to a heat recovery system (28), the other end of the heat recovery system (28) is connected to the water injection pipe (10), the water vapor pipe (29) is connected to a mixed gas pipe (30) through a branch pipe and the outlet end of the air injection pipe (27), the mixed gas pipe (30) is connected to a solid oxide battery (32), and the outlet ends of the solid oxide battery (32) are respectively connected to the water injection pipe (10) and the oxygen nozzle (9).

7. A carbon monoxide production system coupled with internal circulation of electrolyzed water according to claim 6, characterized in that: The water injection pipe (10) is connected to a mixture pipe (39) near its top end, and the other end of the heat recovery system (28) is also connected to a water vapor pipe (29). The water vapor pipe (29) and the mixture pipe (39) are connected to a storage tank (40). The storage tank (40) is connected to the water injection pipe (10) via a water circulation pipe (36). A water pressure pump (37) is provided on the water circulation pipe (36). The top of the storage tank (40) is connected to the hydrogen injection pipe (13).

8. A carbon monoxide production system coupled with internal circulation of electrolyzed water according to claim 7, characterized in that: The hydrogen injection pipe (13) is connected to a hydrogen shunt pipe (35), the hydrogen shunt pipe (35) is connected to a compressor (38), the compressor (38) is connected to a water vapor circulation pipe (34), and the two ends of the water vapor circulation pipe (34) are respectively connected to the water injection pipe (10) and the water vapor pipeline (29).

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