A device for preparing low-carbon recyclable high-temperature oxygen-enriched water vapor

Abstract

The present invention belongs to the technical field of underground coal gasification equipment, and relates to a preparation device for low-carbon recyclable high-temperature oxygen-enriched water vapor, which includes a reservoir, a solar heat absorption plate, an industrial oxygen generator, an oxygen heat exchange spiral tube, a heat exchange water tank, a jet atomizer, a production well, an injection well, a gasification channel and a supercritical carbon dioxide circulation pipeline. The reservoir inputs heated water to the heat exchange water tank through the solar heat absorption plate, and the industrial oxygen generator inputs oxygen to the heat exchange water tank. The jet atomizer inputs high-temperature oxygen-enriched water vapor into the injection well, and the injection well is sequentially connected to the coal seam gasification channel and the production well; the heat absorption end of the supercritical carbon dioxide circulation pipeline is located in the production well, and the heat release end of the supercritical carbon dioxide circulation pipeline is located in the heat exchange water tank; this device transfers the waste heat of the gasification gas and solar energy to the high-temperature oxygen-enriched water vapor and finally to the gasification gas, not only realizing the recovery of the waste heat of the gas, but also providing a new energy storage and transportation method for the utilization of solar energy.

Description

Technical Field:

[0001] The present invention belongs to the technical field of underground coal gasification equipment, and relates to an injection method for generating high-temperature oxygen-enriched steam by using the waste heat of gasification gas and solar energy through supercritical carbon dioxide thermal cycle absorption, and particularly relates to a device and method for preparing low-carbon recyclable high-temperature oxygen-enriched steam. Background Art:

[0002] Underground coal gasification refers to a process of controlling the combustion of coal resources in situ through certain process technologies, so that combustible gases such as CH4, H2, and CO are generated under the action of heat and chemical reactions. Among them, oxygen-enriched steam injection is a gasification agent injection method to improve the calorific value of coal gas, but this method consumes a large amount of heat during the generation of steam. At the same time, the waste heat of the gasification gas in the production well cannot be effectively recovered, resulting in waste of thermal energy and reduction of the strength and service life of the production well.

[0003] In the existing patent technology, a Chinese patent with the publication number of CN112325360A discloses a single-stage subcritical carbon dioxide heat pump system, including a carbon dioxide compressor, an indoor heat exchanger, a heat exchange member, and a phase change energy storage device. The indoor heat exchanger is connected to the heat exchange member, and the heat exchange member is connected to the suction end of the carbon dioxide compressor. The phase change energy storage device includes a heat preservation tank and a heat storage medium located in the heat preservation tank. The heat exchange member is arranged in the heat preservation tank, and the heat storage medium is connected to one or any several of a solar energy collector, an air energy collector, or a ground source energy collector. A Chinese patent with the publication number of CN113090349B discloses a solar thermal coal supercritical water gasification hydrogen and thermal power co-generation system and a working method. The system includes a supercritical water gasification reaction system, a hydrogen production and purification system, a combined cycle power generation system, a heat supply system, and a solar energy collection system. Based on the principle of cascaded utilization of energy, the invention can convert the chemical energy of coal and solar energy into hydrogen energy, electric energy, and heat energy required by users, and can flexibly allocate the hydrogen, heat, and electric loads.

[0004] Xinjiang is an area rich in coal resources and solar resources. Solar power generation is an effective way to utilize solar energy, but it faces problems such as large equipment investment, low energy conversion efficiency, and large long-distance transmission losses. If solar energy is stored in the gasification gas, the above problems can be effectively avoided. Therefore, how to convert the waste heat of the gasification gas and solar energy into the energy of the gasification gas for storage is a key technology that needs to be solved urgently. Summary of the Invention:

[0005] The object of the present invention is to overcome the disadvantages existing in the prior art. In view of the disadvantages of large investment and low energy conversion efficiency of existing solar power generation equipment, as well as the high energy consumption of existing gasifying agent injection methods, the waste heat of gasified gas and solar energy are utilized by supercritical carbon dioxide thermal cycle absorption to generate high-temperature oxygen-rich steam. Under the condition of ensuring low consumption and greenness, a preparation device for low-carbon recyclable high-temperature oxygen-rich steam is designed.

[0006] To achieve the above object, a preparation device for low-carbon recyclable high-temperature oxygen-rich steam according to the present invention has a main structure including a water storage tank, a solar heat absorber, an industrial oxygen generator, a first stop valve, an oxygen booster pump, an oxygen heat exchange spiral tube, a heat exchange water tank, a first circulation pump, a second circulation pump, a jet atomizer, a production well, an injection well, a coal seam, a gasification channel, a combustion surface, and a supercritical carbon dioxide circulation pipeline; the water storage tank is used to store normal temperature water, the water storage tank is communicated with the solar heat absorber, the solar heat absorber is communicated with one end of the first circulation pump, and the other end of the first circulation pump is communicated with the heat exchange water tank; one side port of the heat exchange water tank is communicated with one end of the second circulation pump, and the other end of the second circulation pump is communicated with one input end of the jet atomizer. The other input end of the jet atomizer is communicated with the output end of the oxygen heat exchange spiral tube through a connecting pipe. The oxygen heat exchange spiral tube is installed in the heat exchange water tank, and the heat exchange water tank heats the oxygen heat exchange spiral tube. The input end of the oxygen heat exchange spiral tube is communicated with the output end of the oxygen booster pump, the input end of the oxygen booster pump is communicated with the output end of the first stop valve, and the input end of the first stop valve is communicated with the output end of the industrial oxygen generator; the output end of the jet atomizer is communicated with the input end of the injection well, the output end of the injection well communicates with the combustion surface of the coal seam, a through gasification channel is opened in the coal seam, one end of the gasification channel communicates with the combustion surface, and the other end of the gasification channel communicates with the lower end of the production well; an outlet is provided at the upper end of the production well to output CH4, H2, and CO gases after the coal seam gasification reaction; the heat absorption end of the supercritical carbon dioxide circulation pipeline is installed in the production well, and the heat release end of the supercritical carbon dioxide circulation pipeline is installed in the heat exchange water tank.

[0007] The first circulation pump described in the present invention is used to provide the driving force for the water flow between the water storage tank, the solar heat absorber, and the heat exchange water tank; the second circulation pump is used to provide the driving force for the water flow between the heat exchange water tank and the jet atomizer; the jet atomizer can generate high-temperature oxygen-rich steam.

[0008] The solar heat absorber described in the present invention includes a heat absorption material and a coiled pipe. The water storage tank injects water into the coiled pipe, and the solar heat absorber can transfer the absorbed solar heat to the water in the coiled pipe and heat the water to 60 - 100 °C.

[0009] The first stop valve described in the present invention is used to control the flow and shut-off of pipeline fluid; the industrial oxygen generator is used to separate air and produce oxygen with a purity of over 90%, and the oxygen booster pump is used to boost the oxygen produced by the industrial oxygen generator and transport it into the oxygen heat exchange spiral tube.

[0010] The supercritical carbon dioxide circulation pipeline described in the present invention includes: a second stop valve, a carbon dioxide booster pump, a heating heat exchange spiral tube, and a downhole heat exchange spiral tube. The downhole heat exchange spiral tube is installed in the production well, and the downhole heat exchange spiral tube can transfer the heat of the gasified gas outside the tube in the production well to the supercritical carbon dioxide inside the downhole heat exchange spiral tube. The output end of the downhole heat exchange spiral tube is communicated with the input end of the heating heat exchange spiral tube. The heating heat exchange spiral tube is installed in the heat exchange water tank, and the heating heat exchange spiral tube heats the water in the heat exchange water tank; the output end of the heating heat exchange spiral tube is communicated with the input end of the carbon dioxide booster pump, the output end of the carbon dioxide booster pump is communicated with the input end of the second stop valve, and the output end of the second stop valve is communicated with the input end of the downhole heat exchange spiral tube. The second stop valve is used to control the flow and shut-off of the fluid in the pipeline; the carbon dioxide booster pump is used to boost the carbon dioxide output by the heating heat exchange spiral tube and transport it into the downhole heat exchange spiral tube; the production well, injection well, and coal seam are in the surrounding rock underground.

[0011] The jet atomizer described in the present invention includes a nozzle, a baffle, and an annular flow channel. The input end of the nozzle is communicated with the output end of the oxygen heat exchange spiral tube. The nozzle can form a high-speed jet of oxygen heated and boosted to 1 - 2 MPa. The water input by the second circulation pump into the jet atomizer enters the annular flow channel. The high-speed jet can entrain the water heated to 60 - 100 °C through the annular flow channel. After the high-speed jet and the entrained water hit the baffle arranged at the upper part of the jet atomizer, an atomized fluid of gas-liquid two phases can be formed, and the gas phase is separated and output from the output end of the jet atomizer as oxygen-rich steam.

[0012] The specific steps of the method for injecting high-temperature oxygen-rich steam described in the present invention are as follows:

[0013] (1) Start the equipment: Before the downhole gasifier is ignited, connect the components of the low-carbon recyclable high-temperature oxygen-rich steam preparation device, and then start the first circulation pump to inject the water heated by the solar heat absorber to 90 - 100 °C into the heat exchange water tank; fill the supercritical carbon dioxide circulation pipeline with liquid carbon dioxide at 7 - 10 MPa, open the second stop valve and the carbon dioxide booster pump on the carbon dioxide pipeline. After the liquid carbon dioxide is heated by the heat exchange water tank, the temperature rises above 31.1 °C, and the carbon dioxide enters the supercritical state;

[0014] (2) Initiate the gasification reaction: Open the first shut-off valve and the industrial oxygen generator. The oxygen booster pump pressurizes and transports the oxygen generated by the industrial oxygen generator into the oxygen heat exchange spiral tube. The oxygen in the oxygen heat exchange spiral tube is heated by the heat exchange water tank and then sent into the jet atomizer. The oxygen enters the injection well through the jet atomizer, ignite the underground gasification furnace, and initiate the combustion and gasification reaction of the underground coal seam;

[0015] (3) Prepare high-temperature oxygen-enriched steam: After the production well produces high-temperature gasification gas, increase the power of the carbon dioxide booster pump and heat the water in the heat exchange water tank through the supercritical carbon dioxide thermal cycle; Start the second circulation pump. The water and oxygen heated by the gasification waste heat and solar energy form a high-temperature mist fluid in the jet atomizer. The mist fluid develops into high-temperature oxygen-enriched steam during the transmission process in the injection well;

[0016] (4) Store thermal energy: The high-temperature oxygen-enriched steam leads from the injection well to the coal seam. Part of the high-temperature oxygen-enriched steam participates in the combustion of the combustion surface, and the other part participates in the gasification reaction in the gasification channel. The combustion heat and the thermal energy of the high-temperature oxygen-enriched steam are stored in the gasification gas through the endothermic gasification reaction;

[0017] (5) Reuse waste heat: The gasification gas flows out through the production well, and the waste heat in the gasification gas is transferred to the oxygen and water in the heat exchange water tank through the supercritical carbon dioxide thermal cycle.

[0018] Compared with the prior art, the main structure of the preparation device of the low-carbon recyclable high-temperature oxygen-enriched steam designed by the present invention is reasonable. The waste heat of the gasification gas and solar energy are transferred to the high-temperature oxygen-enriched steam, and then transferred to the gasification gas through the gasification reaction. Thus, not only the recovery of the waste heat of the gasification gas is realized, the high-temperature damage of the production well is avoided, but also a new energy storage and transportation method for solar energy utilization is provided. Brief Description of the Drawings:

[0019] Figure 1 It is a schematic structural principle diagram of the preparation device of the low-carbon recyclable high-temperature oxygen-enriched steam involved in the present invention. Detailed Embodiments:

[0020] The present invention will be further described below by way of examples in conjunction with the accompanying drawings.

[0021] Example 1:

[0022] A preparation device of a low-carbon recyclable high-temperature oxygen-enriched steam involved in this example, as Figure 1As shown in the figure, the main structure includes a water storage tank 1, a solar heat absorber 2, an industrial oxygen generator 3, a first shut-off valve 41, a second shut-off valve 42, an oxygen booster pump 51, a carbon dioxide booster pump 52, an oxygen heat exchange spiral tube 61, a heating heat exchange spiral tube 62, a downhole heat exchange spiral tube 63, a hot water exchange tank 7, a first circulation pump 81, a second circulation pump 82, a jet atomizer 9, a production well 10, an injection well 11, a coal seam 12, a gasification channel 13, and a combustion surface 14. The water storage tank 1 is used to store normal temperature water. The water storage tank 1 is connected to the solar heat absorber 2. The solar heat absorber 2 includes a heat-absorbing material and a coil pipe. The water storage tank 1 injects water into the coil pipe. The solar heat absorber 2 can transfer the absorbed solar heat to the water in the coil pipe and heat the water to 60 - 100 °C. The solar heat absorber 2 is connected to one end of the first circulation pump 81, and the other end of the first circulation pump 81 is connected to the hot water exchange tank 7. The first circulation pump 81 is used to provide the driving force for the water flow between the water storage tank 1, the solar heat absorber 2, and the hot water exchange tank 7. One side port of the hot water exchange tank 7 is connected to one end of the second circulation pump 82, and the other end of the second circulation pump 82 is connected to an input end of the jet atomizer 9. The second circulation pump 82 is used to provide the driving force for the water flow between the hot water exchange tank 7 and the jet atomizer 9. The jet atomizer 9 can generate high-temperature oxygen-rich steam. The other input end of the jet atomizer 9 is connected to the output end of the oxygen heat exchange spiral tube 61 through a connecting pipe. The oxygen heat exchange spiral tube 61 is installed in the hot water exchange tank 7. The hot water exchange tank 7 heats the oxygen heat exchange spiral tube 61. The input end of the oxygen heat exchange spiral tube 61 is connected to the output end of the oxygen booster pump 51. The input end of the oxygen booster pump 51 is connected to the output end of the first shut-off valve 41. The input end of the first shut-off valve 41 is connected to the output end of the industrial oxygen generator 3. The first shut-off valve 41 is used to control the flow and closure of the pipeline fluid. The industrial oxygen generator 3 is used to separate air and produce oxygen with a purity of more than 90%. The oxygen booster pump 51 is used to boost the oxygen produced by the industrial oxygen generator 3 and transport it into the oxygen heat exchange spiral tube 61. The output end of the jet atomizer 9 is connected to the input end of the injection well 11. The output end of the injection well 11 communicates with the combustion surface 14 of the coal seam 12. A through gasification channel 13 is opened in the coal seam 12. One end of the gasification channel 13 communicates with the combustion surface 14, and the other end of the gasification channel 13 is connected to the lower end of the production well 10. The upper end of the production well 10 is provided with an outlet for outputting gases such as CH4, H2, and CO after the gasification reaction of the coal seam 12. The downhole heat exchange spiral tube 63 is installed in the production well 10. The downhole heat exchange spiral tube 63 can transfer the heat of the gasified gas outside the tube in the production well 10 to the supercritical carbon dioxide in the downhole heat exchange spiral tube 63. The output end of the downhole heat exchange spiral tube 63 is connected to the input end of the heating heat exchange spiral tube 62. The heating heat exchange spiral tube 62 is installed in the hot water exchange tank 7. The heating heat exchange spiral tube 62 heats the water in the hot water exchange tank 7.The output end of the heating and heat exchange spiral tube 62 is communicated with the input end of the carbon dioxide booster pump 52. The output end of the carbon dioxide booster pump 52 is communicated with the input end of the second stop valve 42. The output end of the second stop valve 42 is communicated with the input end of the downhole heat exchange spiral tube 63. The second stop valve 42 is used to control the flow and closure of the fluid in the pipeline. The carbon dioxide booster pump 52 is used to boost the carbon dioxide output from the heating and heat exchange spiral tube 62 and transport it to the downhole heat exchange spiral tube 63. The production well 10, the injection well 11, and the coal seam 12 are located in the surrounding rock 15 underground.

[0023] The jet atomizer 9 involved in this embodiment includes a nozzle, a baffle, and an annular flow channel. The input end of the nozzle is communicated with the output end of the oxygen heat exchange spiral tube 61. The nozzle can form a high-speed jet of oxygen heated and pressurized to about 1-2 MPa. The water input into the jet atomizer 9 by the second circulation pump 82 enters the annular flow channel. The high-speed jet can entrain the water heated to about 60-100 °C through the annular flow channel. After the high-speed jet and the entrained water hit the baffle arranged at the upper part of the jet atomizer 9, an atomized fluid of gas-liquid two-phase can be formed. The gas phase is separated and output as oxygen-rich steam from the output end of the jet atomizer 9.

[0024] The specific steps of the injection method of high-temperature oxygen-rich steam involved in this embodiment are as follows:

[0025] (1) Start the equipment: Before the downhole gasifier is ignited, connect the components of the low-carbon recyclable high-temperature oxygen-rich steam preparation device, and then start the first circulation pump 81 to inject the water heated to 90-100 °C by the solar heat absorption plate 2 into the heat exchange water tank 7. The supercritical carbon dioxide (SC-CO2) circulation pipeline constructed by the second stop valve 42, the carbon dioxide booster pump 52, the heating and heat exchange spiral tube 62, and the downhole heat exchange spiral tube 63 is filled with liquid carbon dioxide at 7-10 MPa. Open the second stop valve 42 and the carbon dioxide booster pump 52 on the carbon dioxide pipeline. After the liquid carbon dioxide is heated by the heat exchange water tank 7, the temperature rises above 31.1 °C, and the carbon dioxide enters the supercritical state.

[0026] (2) Start the gasification reaction: Open the first stop valve 41 and the industrial oxygen generator 3. The oxygen booster pump 51 boosts the oxygen generated by the industrial oxygen generator 3 and transports it to the oxygen heat exchange spiral tube 61. The oxygen in the oxygen heat exchange spiral tube 61 is heated by the heat exchange water tank 7 and sent into the jet atomizer 9. The oxygen enters the injection well 11 through the jet atomizer 9, ignite the downhole gasifier, and start the underground coal seam combustion and gasification reaction.

[0027] (3) Preparation of high-temperature oxygen-rich steam: After the production well 10 produces high-temperature gasified gas, increase the power of the carbon dioxide booster pump 52, and heat the water in the heat exchange water tank 7 through the supercritical carbon dioxide thermal cycle; start the second circulation pump 82, and the water and oxygen heated by the gasification waste heat and solar energy form a high-temperature fog-like fluid in the jet atomizer 9. The fog-like fluid develops into high-temperature oxygen-rich steam during the transmission process in the injection well 11;

[0028] (4) Thermal energy storage: The high-temperature oxygen-rich steam leads from the injection well 11 to the coal seam 12. A part of the high-temperature oxygen-rich steam participates in the combustion of the combustion surface 14, and another part of the high-temperature oxygen-rich steam participates in the gasification reaction in the gasification channel 13. The combustion heat and the thermal energy of the high-temperature oxygen-rich steam are stored in the gasified gas through the endothermic gasification reaction;

[0029] (5) Waste heat reuse: The gasified gas flows out through the production well 10, and the waste heat in the gasified gas is transferred to the oxygen and water in the heat exchange water tank 7 through the supercritical carbon dioxide thermal cycle.

[0030] The working principle of the present invention is:

[0031] Utilize the supercritical carbon dioxide spiral tube heat exchange and the solar energy heat absorption plate to transfer the waste heat of the gasified gas and solar energy to water and oxygen. The heated water and oxygen further form high-temperature oxygen-rich steam through the jet atomizer. The high-temperature oxygen-rich steam participates in the endothermic gasification reaction, thereby transferring the energy of the gas waste heat and solar energy to the gasified gas.

Claims

1. A preparation device for low-carbon recyclable high-temperature oxygen-enriched steam, comprising a production well, an injection well, a coal seam, a gasification channel, and a combustion surface, characterized in that: It also includes a reservoir, a solar heat absorber, an industrial oxygen generator, a first stop valve, an oxygen booster pump, an oxygen heat exchange spiral tube, a hot water exchange tank, a first circulation pump, a second circulation pump, a jet atomizer, and a supercritical carbon dioxide circulation pipeline; the reservoir is used to store normal temperature water, the reservoir is connected to the solar heat absorber, the solar heat absorber is connected to one end of the first circulation pump, and the other end of the first circulation pump is connected to the hot water exchange tank; one side port of the hot water exchange tank is connected to one end of the second circulation pump, the other end of the second circulation pump is connected to one input end of the jet atomizer, the other input end of the jet atomizer is connected to the output end of the oxygen heat exchange spiral tube through a connecting pipe, the oxygen heat exchange spiral tube is installed in the hot water exchange tank, the hot water exchange tank heats the oxygen heat exchange spiral tube, the input end of the oxygen heat exchange spiral tube is connected to the output end of the oxygen booster pump, the input end of the oxygen booster pump is connected to the output end of the first stop valve, and the input end of the first stop valve is connected to the output end of the industrial oxygen generator; the output end of the jet atomizer is connected to the input end of the injection well, the output end of the injection well communicates with the combustion surface of the coal seam, a through gasification channel is opened in the coal seam, one end of the gasification channel communicates with the combustion surface, and the other end of the gasification channel is connected to the lower end of the production well; an outlet is provided at the upper end of the production well to output CH4, H2, and CO gases after the coal seam gasification reaction; the heat absorption end of the supercritical carbon dioxide circulation pipeline is installed in the production well, and the heat release end of the supercritical carbon dioxide circulation pipeline is installed in the hot water exchange tank; the supercritical carbon dioxide circulation pipeline includes: a second stop valve, a carbon dioxide booster pump, a heating heat exchange spiral tube, and a downhole heat exchange spiral tube; The method for injecting high-temperature oxygen-enriched steam using the preparation device for low-carbon recyclable high-temperature oxygen-enriched steam is as follows: (1) Start the equipment: Before igniting the underground gasifier, connect the components of the preparation device for low-carbon recyclable high-temperature oxygen-enriched steam, then start the first circulation pump, and inject water heated to 90 - 100 °C by the solar heat absorber into the hot water exchange tank; fill the supercritical carbon dioxide circulation pipeline with liquid carbon dioxide at 7 - 10 MPa, open the second stop valve and the carbon dioxide booster pump on the carbon dioxide pipeline, and after the liquid carbon dioxide is heated by the hot water exchange tank, the temperature rises above 31.1 °C, and the carbon dioxide enters the supercritical state; (2) Start the gasification reaction: Open the first stop valve and the industrial oxygen generator, the oxygen booster pump boosts and transports the oxygen generated by the industrial oxygen generator into the oxygen heat exchange spiral tube, the oxygen in the oxygen heat exchange spiral tube is heated by the hot water exchange tank and sent into the jet atomizer, the oxygen enters the injection well through the jet atomizer, ignite the underground gasifier, and start the underground coal seam combustion and gasification reaction; (3) Prepare high-temperature oxygen-enriched steam: After the production well produces high-temperature gasified gas, increase the power of the carbon dioxide booster pump, and heat the water in the hot water exchange tank through the supercritical carbon dioxide thermal cycle; start the second circulation pump, and the water and oxygen heated by the gasification waste heat and solar energy form a high-temperature misty fluid in the jet atomizer, and the misty fluid develops into high-temperature oxygen-enriched steam during the transmission in the injection well; (4) Storing thermal energy: The high-temperature oxygen-rich steam is led from the injection well to the coal seam. A part of the high-temperature oxygen-rich steam participates in the combustion on the combustion surface, and another part participates in the gasification reaction in the gasification channel. The combustion heat and the thermal energy of the high-temperature oxygen-rich steam are stored in the gasification gas through the endothermic gasification reaction. (5) Recycling waste heat: The gasification gas flows out through the production well, and the waste heat in the gasification gas is transferred to the oxygen and water in the heat exchange water tank through the supercritical carbon dioxide thermal cycle.

2. The preparation device for low-carbon recyclable high-temperature oxygen-enriched water vapor according to claim 1, characterized in that: The first circulation pump is used to provide the power for the water flow among the reservoir, the solar heat absorber, and the heat exchange water tank; the second circulation pump is used to provide the power for the water flow between the heat exchange water tank and the jet atomizer; the jet atomizer can generate high-temperature oxygen-rich steam.

3. The preparation device for low-carbon recyclable high-temperature oxygen-enriched water vapor according to claim 2, characterized in that: The solar heat absorber includes heat-absorbing materials and coiled pipes. Water is injected from the reservoir into the coiled pipes. The solar heat absorber can transfer the absorbed solar heat to the water in the coiled pipes and heat the water to 60 - 100 °C.

4. The preparation device for low-carbon recyclable high-temperature oxygen-enriched water vapor according to claim 3, characterized in that: The first stop valve is used to control the flow and cut-off of the pipeline fluid; the industrial oxygen generator is used to separate air and produce oxygen with a purity of more than 90%. The oxygen booster pump is used to boost the oxygen produced by the industrial oxygen generator and transport it to the oxygen heat exchange spiral pipe.

5. The preparation device for low-carbon recyclable high-temperature oxygen-enriched water vapor according to claim 4, characterized in that: The heat exchange spiral pipe in the well is installed in the production well. The heat exchange spiral pipe in the well can transfer the heat of the gasification gas outside the pipe in the production well to the supercritical carbon dioxide inside the heat exchange spiral pipe in the well. The output end of the heat exchange spiral pipe in the well is connected to the input end of the heating heat exchange spiral pipe. The heating heat exchange spiral pipe is installed in the heat exchange water tank and heats the water in the heat exchange water tank; the output end of the heating heat exchange spiral pipe is connected to the input end of the carbon dioxide booster pump. The output end of the carbon dioxide booster pump is connected to the input end of the second stop valve. The output end of the second stop valve is connected to the input end of the heat exchange spiral pipe in the well. The second stop valve is used to control the flow and cut-off of the fluid in the pipeline; the carbon dioxide booster pump is used to boost the carbon dioxide output from the heating heat exchange spiral pipe and transport it to the heat exchange spiral pipe in the well; the production well, the injection well, and the coal seam are located in the surrounding rock underground.

6. The preparation device of low-carbon recyclable high-temperature oxygen-enriched water vapor according to claim 5, characterized in that: The jet atomizer includes a nozzle, a baffle, and an annular flow channel. The input end of the nozzle is connected to the output end of the oxygen heat exchange spiral pipe. The nozzle can form a high-speed jet of oxygen heated and pressurized to 1 - 2 MPa. The water input into the jet atomizer by the second circulation pump enters the annular flow channel. The high-speed jet can entrain the water heated to 60 - 100 °C through the annular flow channel. After the high-speed jet and the entrained water hit the baffle arranged at the upper part of the jet atomizer, a gas-liquid two-phase atomized fluid can be formed, and the gas phase is separated and output from the output end of the jet atomizer as oxygen-rich steam.

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