Gas carbon reduction treatment system based on hydrogen production from mine water

Abstract

The application discloses a gas carbon reduction treatment system based on hydrogen preparation from mine water, which comprises a crystallization reactor, wherein the output end of the crystallization reactor is connected with a concentrated water pool, a distilled water pool and a heating device through pipelines respectively, and the input end of the crystallization reactor is connected with a steam turbine through a pipeline; the steam turbine is connected with a generator through a shaft, and the output end of the heating device is connected with the steam turbine; the output end of the distilled water pool is connected with a hydrogen preparation device and a hydrogen storage tank through pipelines in sequence, the output end of the hydrogen storage tank is connected with a gas generator and the generator through pipelines respectively, and the output end of the gas generator is connected with a carbon capture device, and the gas generator is connected with a gas storage tank through a pipeline, thereby solving the problems of large mine water discharge and high carbon emission in gas utilization in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of mine energy equipment technology, specifically relating to a gas carbon reduction treatment system based on mine water hydrogen production. Background Technology

[0002] Coal mining inevitably generates mine drainage and mine gas. Currently, mine drainage is treated to meet standards before being reused or discharged. However, the desalination process in mine water treatment produces a large amount of concentrated brine, which requires significant heat for crystallization and salt separation. For coal mines with large water inflows, the treated drainage cannot be fully absorbed, necessitating the construction of surface reservoirs.

[0003] In the early days of coal mine construction, in order to solve the problems of heating and electricity supply in coal mines, and at the same time improve the on-site resource utilization of low-quality coal such as coal gangue produced by washing and processing, some coal mines built small self-owned power plants. Summary of the Invention

[0004] The purpose of this invention is to provide a gas carbon reduction treatment system based on mine water hydrogen production, which solves the problems of large mine water discharge and high carbon emissions from gas utilization in the prior art.

[0005] The technical solution adopted in this invention is a gas carbon reduction treatment system based on mine water hydrogen production, including a crystallization reactor. The output end of the crystallization reactor is connected to a concentrated water tank, a distilled water tank, and a heating device via pipelines. The input end of the crystallization reactor is connected to a steam turbine via a pipeline. The steam turbine is connected to a generator via a shaft. The output end of the heating device is connected to the steam turbine. The output end of the distilled water tank is connected to a hydrogen production device and a hydrogen storage tank via pipelines. The output end of the hydrogen storage tank is connected to a gas generator and a generator via pipelines. The output end of the gas generator is connected to a carbon capture device. The gas generator is connected to the gas storage tank via a pipeline.

[0006] The invention is further characterized by:

[0007] The heating device includes a molten salt heater. The output end of the molten salt heater is connected to a high-temperature molten salt storage tank and a low-temperature molten salt storage tank via pipes. The output end of the high-temperature molten salt storage tank is connected to a steam generator via pipes. The output end of the steam generator is connected to a steam turbine and a low-temperature molten salt storage tank via pipes. The output end of the crystallization reactor is connected to the steam generator via pipes. The input end of the molten salt heater is connected to a wind power generation unit and a photovoltaic power generation unit via wires.

[0008] Both wind power and photovoltaic power generation are connected to the hydrogen production unit via power lines.

[0009] The gas generator has an exhaust pipe connected to the top.

[0010] The gas generator is connected to the carbon capture device via a first valve.

[0011] A second valve is installed on the pipe connecting the concentrate tank and the crystallization reactor.

[0012] The gas storage tank input is connected to a gas extraction pumping station via a pipeline.

[0013] The output end of the carbon capture device is connected in sequence to a CO2 storage tank and a CO2 delivery pump via pipelines.

[0014] The beneficial effects of this invention are:

[0015] (1) The concentrated brine produced in the mine water treatment process is heated and reduced by the extraction of steam in the energy storage power generation process. The resulting distilled water is used in the water electrolysis hydrogen production device. The mine drainage is converted into green hydrogen through wind and solar new energy green electricity, realizing the resource utilization of mine water and greatly improving the local consumption and conversion rate of mine water and new energy.

[0016] (2) By transforming the original small coal-fired generator sets from power sources to energy storage, the original coal-fired boilers are replaced by molten salt energy storage while the original steam turbines are retained, forming a technical route of molten salt energy storage + steam turbines. This not only increases the proportion of new energy consumption, but also provides an application scenario for the continued service of the original power generation equipment, and provides a new idea for the transformation of traditional small coal-fired generator sets.

[0017] (3) The hydrogen production and energy storage power generation system using concentrated brine from mines utilizes the hydrogen produced to generate hydrogen, which is then co-fired in the mine gas power generation process. This solves the problem of limited local application scenarios for green electricity hydrogen production and significantly reduces carbon emissions during gas utilization. Simultaneously, the carbon dioxide generated from gas power generation is captured, purified, and used in underground coal mine fire prevention and extinguishing systems, achieving an organic combination of carbon reduction and resource utilization, providing a new technical solution for building "zero-carbon mines." Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the gas carbon reduction treatment system based on mine water hydrogen production according to the present invention.

[0019] In the diagram, 1. Wind power generation, 2. Photovoltaic power generation, 3. Molten salt heater, 4. High-temperature molten salt storage tank, 5. Low-temperature molten salt storage tank, 6. Steam generator, 7. Steam turbine, 8. Generator, 9. Concentrate pool, 10. Crystallization reactor, 11. Distilled water pool, 12. Hydrogen production unit, 13. Hydrogen storage tank, 14. Gas extraction pump station, 15. Gas storage tank, 16. Gas generator, 17. Carbon capture device, 18. CO2 storage tank, 19. CO2 transfer pump, 20. First valve, 21. Discharge pipe, 22. Heating device, 23. Second valve. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] This invention provides a gas carbon reduction treatment system based on mine water hydrogen production, such as... Figure 1 As shown, the system includes a crystallization reactor 10. The output of the crystallization reactor 10 is connected to a concentrated water tank 9, a distilled water tank 11, and a heating device 22 via pipelines. The input of the crystallization reactor 10 is connected to a steam turbine 7 via a pipeline. The steam turbine 7 is connected to a generator 8 via a shaft. The output of the heating device 22 is connected to the steam turbine 7. The output of the distilled water tank 11 is connected to a hydrogen production device 12 and a hydrogen storage tank 13 via pipelines. The output of the hydrogen storage tank 13 is connected to a gas generator 16 and the generator 8 via pipelines. The output of the gas generator 16 is connected to a carbon capture device 17. The gas generator 16 is connected to a gas storage tank 15 via a pipeline.

[0022] The heating device 22 includes a molten salt heater 3. The output end of the molten salt heater 3 is connected to a high-temperature molten salt storage tank 4 and a low-temperature molten salt storage tank 5 through pipes. The output end of the high-temperature molten salt storage tank 4 is connected to a steam generator 6 through pipes. The output end of the steam generator 6 is connected to a steam turbine 7 and a low-temperature molten salt storage tank 5 through pipes. The output end of the crystallization reactor 10 is connected to the steam generator 6 through pipes. The input end of the molten salt heater 3 is connected to a wind power generator 1 and a photovoltaic power generator 2 through wires.

[0023] Both the wind power generator 1 and the photovoltaic power generator 2 are connected to the hydrogen production unit 12 via power lines. The top of the gas generator 16 is connected to an exhaust pipe 21; a first valve 20 is installed on the pipe connecting the gas generator 16 to the carbon capture device 17.

[0024] The first valve 20 controls the flow rate of CO2 entering the carbon capture device 17 from the inlet and outlet of the gas generator 16.

[0025] A second valve 23 is installed on the pipeline connecting the concentrate tank 9 and the crystallization reactor 10. Specifically, a branch line is introduced into the concentrate tank 9 from the pipeline connecting the steam turbine 7 and the steam reactor 6, and a second valve 23 is installed thereon. The second valve 23 controls the periodic discharge of the high brine generated during the thermal cycle of the steam turbine 7 into the concentrate tank 9. The gas storage tank 15 input end is connected to the gas extraction pump station 14 through a pipeline, and the carbon capture device 17 output end is connected to the CO2 storage tank 18 and the CO2 transfer pump 19 in sequence through a pipeline.

[0026] The steam turbine 7 is connected to the crystallization reactor 10 via a pipeline, providing the heat required for steam crystallization. The extracted steam after condensation in the crystallization reactor 10 is connected to the steam inlet of the steam generator 6 via a pipeline. The steam turbine 7 is also connected to the mine concentrate pool 9 via a pipeline. During the steam-water circulation process of the steam turbine 7, the salt content will gradually increase. To avoid scaling on the steam turbine 7, it is necessary to discharge the brine. By opening the second valve 23 on the pipeline connecting the crystallization reactor 10 and the mine concentrate pool 9, the brine generated during the steam-water circulation process of the steam turbine 7 can be discharged into the concentrate pool 9 for unified treatment, ensuring that the salt content of the steam-water circulation system of the steam turbine 7 does not exceed the standard.

[0027] The working process is as follows: Wind power generation 1 and photovoltaic power generation 2 are used as the power sources for the molten salt heater 3 and the hydrogen production device 12. The concentrated brine produced by the mine water treatment enters the concentrated brine tank 9. The concentrated brine in the concentrated brine tank 9 enters the crystallization reactor 10 through a pipeline. The distilled water produced by the crystallization reactor 10 enters the distillation water tank 11 through a pipeline. The distilled water in the distillation water tank 11 enters the hydrogen production device 12 through a pipeline. The hydrogen produced by the hydrogen production device 12 enters the hydrogen storage tank 13 and then enters two separate streams. One of these streams is connected to the gas in the gas storage tank 15. The gas enters the gas generator 16 for mixed combustion. Some of the harmless gases after combustion are discharged into the atmosphere, while the other part is connected to the carbon capture device 17 through a pipeline. The treated CO2 is pumped to the mine fire prevention and extinguishing system, making full use of the inertness, asphyxiation and low-temperature heat absorption properties of liquid CO2 to achieve the purpose of cooling and fire prevention and extinguishing, effectively preventing spontaneous combustion of coal seams. After passing through the hydrogen storage tank 13, another part flows to the generator 8 to cool the generator 8. Hydrogen has a low density and strong thermal conductivity, which can greatly reduce the internal friction loss of the generator 8 and improve the generator efficiency.

[0028] Example 1

[0029] The gas carbon reduction system based on mine water hydrogen production of the present invention includes a crystallization reactor 10. The output end of the crystallization reactor 10 is connected to a concentrated water tank 9, a distillation water tank 11 and a heating device 22 via pipelines. The input end of the crystallization reactor 10 is connected to a steam turbine 7 via a pipeline. The steam turbine 7 is connected to a generator 8 via a shaft. The output end of the heating device 22 is connected to the steam turbine 7. The output end of the distillation water tank 11 is connected to a hydrogen production device 12 and a hydrogen storage tank 13 via pipelines. The output end of the hydrogen storage tank 13 is connected to a gas generator 16 and the generator 8 via pipelines. The output end of the gas generator 16 is connected to a carbon capture device 17. The gas generator 16 is connected to a gas storage tank 15 via a pipeline.

[0030] The treatment process for concentrated brine from the mine is as follows: the concentrated brine produced by the mine drainage from the bottom of the coal mine after water treatment is stored in the concentrated brine pool 9. The concentrated brine flows into the crystallization reactor 10 through a pipeline. The steam extracted by the turbine 7 provides the energy required for the crystallization and evaporation of the evaporation crystallization reactor 10. The distilled water produced by the evaporation crystallization reactor 10 enters the distillation water pool 11 through a pipeline. The distillation water pool 11 is connected to the hydrogen production device 12. Hydrogen is produced by electrolyzing water. The hydrogen is stored in the hydrogen storage tank 13 through a pipeline. The hydrogen in the hydrogen storage tank 13 is used for two purposes: one part is used to cool the generator 8, and the other part enters the gas generator 16 for co-combustion. The concentrated brine from the mine is used to produce hydrogen by using the green electricity generated by the solar power generation 1 and the wind and photovoltaic power generation 2. This realizes the reduction and resource utilization of the concentrated brine from the mine on-site, which not only solves the problem of where a large amount of mine drainage has nowhere to go, but also organically combines coal mine water treatment with new energy consumption and gas power generation, realizing multi-process synergistic carbon reduction in the mining area.

[0031] Example 2

[0032] The gas carbon reduction system based on mine water hydrogen production of the present invention includes a crystallization reactor 10. The output end of the crystallization reactor 10 is connected to a concentrated water tank 9, a distillation water tank 11 and a heating device 22 via pipelines. The input end of the crystallization reactor 10 is connected to a steam turbine 7 via a pipeline. The steam turbine 7 is connected to a generator 8 via a shaft. The output end of the heating device 22 is connected to the steam turbine 7. The output end of the distillation water tank 11 is connected to a hydrogen production device 12 and a hydrogen storage tank 13 via pipelines. The output end of the hydrogen storage tank 13 is connected to a gas generator 16 and the generator 8 via pipelines. The output end of the gas generator 16 is connected to a carbon capture device 17. The gas generator 16 is connected to a gas storage tank 15 via a pipeline.

[0033] The process for treating mine gas is as follows: Distilled water is obtained by treating mine water, and hydrogen is generated by electrolysis of the distilled water. The hydrogen is stored in a hydrogen storage tank 13. Mine gas and hydrogen in the storage tank 13 are transported together to a gas generator 16 for combustion. After combustion, a large amount of CO2 is generated and transported through pipelines to a carbon capture device 17, and then pumped by a CO2 transfer pump 19 to the mine fire extinguishing system. Hydrogen has a low ignition energy and is easily ignited, with an ignition limit range of 4% to 75% in air. Co-combustion with gas helps to enhance the combustion process. The flue gas produced after combustion mainly contains CO2 and water. Co-combustion can reduce the original CO2 emission concentration in the gas. At the same time, the high-concentration CO2 captured and purified by the carbon capture device 17 is reused in the coal mine fire prevention and extinguishing system, significantly reducing the amount of carbon dioxide emitted into the environment. This achieves an organic combination of carbon reduction in the gas combustion process and safe coal mining. The clean flue gas generated by combustion in the gas generator 16 is discharged into the air through the exhaust pipe 21. A first valve 20 is provided on the pipe connecting the gas generator 16 and the carbon capture device 17. The first valve 20 controls the flow rate of CO2 entering the carbon capture device 17 from the outlet of the gas generator 16.

[0034] Example 3

[0035] The gas carbon reduction system based on mine water hydrogen production of the present invention includes a crystallization reactor 10. The output end of the crystallization reactor 10 is connected to a concentrated water tank 9, a distillation water tank 11 and a heating device 22 via pipelines. The input end of the crystallization reactor 10 is connected to a steam turbine 7 via a pipeline. The steam turbine 7 is connected to a generator 8 via a shaft. The output end of the heating device 22 is connected to the steam turbine 7. The output end of the distillation water tank 11 is connected to a hydrogen production device 12 and a hydrogen storage tank 13 via pipelines. The output end of the hydrogen storage tank 13 is connected to a gas generator 16 and the generator 8 via pipelines. The output end of the gas generator 16 is connected to a carbon capture device 17. The gas generator 16 is connected to a gas storage tank 15 via a pipeline.

[0036] The treatment process for mine brine and gas is as follows: Mine drainage from the bottom of the coal mine is treated to produce brine, which is then stored in a concentrated brine tank 9. The brine flows through a pipeline into a crystallization reactor 10. Steam turbine 7 extracts steam to provide the necessary energy for crystallization and evaporation in the crystallization reactor 10. The distilled water produced by the evaporation and crystallization reactor 10 enters a distillation water tank 11 through a pipeline. The distillation water tank 11 is connected to a hydrogen production unit 12, where water electrolysis produces hydrogen. The hydrogen is then stored in a hydrogen storage tank 13 through a pipeline. The hydrogen in the storage tank 13 is used in two ways: one part is used to cool the generator 8, and the other part is initially stored in the hydrogen storage tank 13. Methane from the coal seam is pumped into a gas storage tank 15 via a gas extraction pump station 14. The methane in the gas storage tank 15 is mixed with hydrogen from a hydrogen storage tank 13 and then mixed and burned in a gas generator 16. The clean flue gas produced after combustion is discharged into the atmosphere through an exhaust pipe 21. The CO2 produced after combustion enters a carbon capture device 17 through an open first valve 20. After being captured and purified, the CO2 is transported to a CO2 storage tank 18 and then pumped by a CO2 transfer pump 19 to the mine fire extinguishing system for underground fire prevention and extinguishing. The first valve 20 controls the flow rate of CO2 from the outlet of the gas generator 16 into the carbon capture device 17.

Claims

1. A gas carbon reduction treatment system based on mine water hydrogen production, characterized in that, The system includes a crystallization reactor (10), the output of which is connected to a concentrated water tank (9), a distilled water tank (11) and a heating device (22) via pipes. The input of the crystallization reactor (10) is connected to a steam turbine (7) via pipes. The steam turbine (7) is connected to a generator (8) via a shaft. The output of the heating device (22) is connected to the steam turbine (7). The output of the distilled water tank (11) is connected to a hydrogen production device (12) and a hydrogen storage tank (13) via pipes. The output of the hydrogen storage tank (13) is connected to a gas generator (16) and a generator (8) via pipes. The output of the gas generator (16) is connected to a carbon capture device (17) via pipes. The gas generator (16) is connected to a gas storage tank (15) via pipes. The heating device (22) includes a molten salt heater (3). The output end of the molten salt heater (3) is connected to a high-temperature molten salt storage tank (4) and a low-temperature molten salt storage tank (5) through pipes. The output end of the high-temperature molten salt storage tank (4) is connected to a steam generator (6) through pipes. The output end of the steam generator (6) is connected to a steam turbine (7) and a low-temperature molten salt storage tank (5) through pipes. The output end of the crystallization reactor (10) is connected to the steam generator (6) through pipes. The input end of the molten salt heater (3) is connected to a wind power generator (1) and a photovoltaic power generator (2) through wires. Both the wind power generation (1) and the photovoltaic power generation (2) are connected to the hydrogen production device (12) via wires.

2. The gas carbon reduction system based on mine water hydrogen production according to claim 1, characterized in that, The gas generator (16) is connected to an exhaust pipe (21) at the top.

3. The gas carbon reduction system based on mine water hydrogen production according to claim 2, characterized in that, A first valve (20) is provided on the pipe connecting the gas generator (16) and the carbon capture device (17).

4. The gas carbon reduction system based on mine water hydrogen production according to claim 3, characterized in that, The gas storage tank (15) is connected to a gas extraction pump station (14) via a pipeline at its input end.

5. The gas carbon reduction system based on mine water hydrogen production according to claim 4, characterized in that, The output end of the carbon capture device (17) is connected in sequence to a CO2 storage tank (18) and a CO2 delivery pump (19) via a pipeline.

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