A mine resource utilization system

Abstract

The invention discloses a mine resource utilization system, comprising a first power generation unit, an ammonium bicarbonate synthesis unit, a second power generation unit and a recovery unit; the first power generation unit is connected with mine water for hydropower generation; the second power generation unit is connected with a mine goaf for gas power generation; the first power generation unit and / or the second power generation unit is connected with the ammonium bicarbonate synthesis unit; the recovery unit is located between and connected to the second power generation unit and is used to recover carbon dioxide and nitrogen in the flue gas generated by the second power generation unit and provide them to the ammonium bicarbonate synthesis unit as ammonium bicarbonate synthesis raw materials; by arranging the first power generation unit, the ammonium bicarbonate synthesis unit, the second power generation unit and the recovery unit, the residual resources in the mine can be recovered and utilized to produce ammonium bicarbonate, thereby improving the resource utilization rate in the mine, and in the process, no substances polluting the environment are discharged, thereby achieving the technical effect of turning waste into treasure.

Description

Technical Field

[0001] The invention belongs to the technical field of abandoned mine utilization, and in particular relates to an abandoned mine resource utilization system. Background Art

[0002] There is still a lot of residual gas between adjacent coal seams in abandoned coal mines, in the coal pillars remaining in the mines, and in the goafs underground, which can be released into the atmosphere from surface cracks or mining channels, leading to an increase in the concentration of greenhouse gases in the atmosphere. At the same time, coal mining causes changes in the overburden structure and enhances the permeability between rock layers. With the infiltration of rainwater, it can carry away coal gangue, oil pollution generated by abandoned coal mining supports and coal mining equipment, and corrosion products of abandoned wood and metal equipment, etc., and penetrate into the ground to cause groundwater pollution, making the groundwater undrinkable. Because the development of abandoned coal mines and the utilization of resources in abandoned coal mines have not received attention, it has caused environmental pollution and energy waste. Summary of the invention

[0003] In view of the above problems, the present invention discloses a mine resource utilization system to overcome the above problems or at least partially solve the above problems.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A mine resource utilization system comprises a first power generation unit, an ammonium bicarbonate synthesis unit, a second power generation unit and a recovery unit; the first power generation unit is connected to mine water and is used to extract mine water for hydroelectric power generation; the second power generation unit is connected to a mine goaf and is used to extract gas in the mine goaf for power generation; the first power generation unit and / or the second power generation unit are connected to the ammonium bicarbonate synthesis unit and are used to continuously provide power to the ammonium bicarbonate synthesis unit; the recovery unit is located between the second power generation unit and the ammonium bicarbonate synthesis unit and is used to recover carbon dioxide and nitrogen in the flue gas generated by the second power generation unit and provide them to the ammonium bicarbonate synthesis unit as raw materials for ammonium bicarbonate synthesis.

[0006] Optionally, the first power generation unit includes a high-level water reservoir, a hydroelectric generator and a low-level water reservoir; the height of the high-level water reservoir is higher than the height of the hydroelectric generator; the high-level water reservoir is connected to mine water, and the high-level water reservoir, the hydroelectric generator and the low-level water reservoir are connected in pairs for the recycling of mine water.

[0007] Optionally, the ammonium bicarbonate synthesis unit includes a water electrolysis device and an ammonium bicarbonate synthesizer; the hydroelectric generator and the second power generation unit are respectively connected to the water electrolysis device for supplying power to the water electrolysis device; the water electrolysis device is respectively connected to a water source and the ammonium bicarbonate synthesizer for transporting hydrogen generated by electrolysis of water as a raw material for ammonium bicarbonate synthesis to the ammonium bicarbonate synthesizer; the recovery unit is connected to the ammonium bicarbonate synthesizer for providing carbon dioxide and nitrogen as raw materials to the ammonium bicarbonate synthesizer for synthesizing ammonium bicarbonate.

[0008] Optionally, the low-level water storage tank is connected to the water electrolysis equipment and is used as a water source for the water electrolysis equipment.

[0009] Optionally, the ammonium bicarbonate synthesis unit also includes a water treatment unit; the water treatment unit is connected to the low-level water reservoir and the water electrolysis equipment respectively, and is used to remove impurities from water in the low-level water reservoir before transporting it to the water electrolysis equipment.

[0010] Optionally, the ammonium bicarbonate synthesis unit also includes an ammonia synthesis device; the ammonia synthesis device is located between the water electrolysis device and the ammonium bicarbonate synthesizer, and the ammonia synthesis device is connected to the recovery unit, and is used to synthesize ammonia from hydrogen and nitrogen and transport it to the ammonium bicarbonate synthesizer as an ammonium bicarbonate synthesis raw material.

[0011] Optionally, the second power generation unit includes a gas generator; the gas generator is connected to the mine goaf and the ammonium bicarbonate synthesis unit respectively, and is used to recover the gas in the mine goaf to generate electricity and supply power to the water electrolysis equipment.

[0012] Optionally, the second power generation unit includes a gas purifier; the gas purifier is connected to the mine goaf and the gas generator respectively, and is used to generate electricity from the gas after removing impurities.

[0013] Optionally, the recovery unit includes a waste heat boiler and a gas separation device; the air inlet of the waste heat boiler is connected to the gas generator, and the air outlet of the waste heat boiler is connected to the gas separation device, for recovering the heat of the flue gas generated by the gas generator; the gas separation device is used to collect and separate carbon dioxide and nitrogen in the flue gas, the nitrogen outlet of the gas separation device is connected to the ammonia synthesis device, and the carbon dioxide gas outlet of the gas separation device is connected to the ammonium bicarbonate synthesizer.

[0014] Optionally, the recovery unit also includes a nitrogen purifier and a carbon dioxide purifier; the carbon dioxide purifier is located between the carbon dioxide gas outlet of the gas separation equipment and the ammonium bicarbonate synthesizer, and is used to remove impurities in the carbon dioxide; the nitrogen purifier is located between the nitrogen outlet of the gas separation equipment and the ammonia synthesis equipment, and is used to remove impurities in the nitrogen.

[0015] The advantages and beneficial effects of the present invention are:

[0016] In the mine resource utilization system of the present invention, a first power generation unit, an ammonium bicarbonate synthesis unit, a second power generation unit and a recovery unit are provided. The first power generation unit and the second power generation unit can respectively utilize the water and gas in the mine to generate electricity and provide the electricity to the ammonium bicarbonate synthesis unit to synthesize ammonium bicarbonate, thereby achieving the effect of improving the resource utilization of mine water and residual gas, thereby improving the resource utilization rate of the mine. At the same time, the recovery unit is used to recover the carbon dioxide and nitrogen in the flue gas generated by the second power generation unit and use them as the raw materials required by the ammonium bicarbonate synthesis unit, so that the mine resource utilization system achieves zero emission of environmental pollutants and carbon dioxide, thereby improving the technical effect of environmental protection. As one of the raw materials for nitrogen fertilizer, ammonium bicarbonate can provide the required nutrients for plants, thereby achieving the effect of turning waste into treasure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the structure of a mine resource utilization system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and effect of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in combination with the specific embodiments of the present invention and the corresponding drawings. 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 making creative work are within the scope of protection of the present invention.

[0020] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0021] Combination Figure 1As shown, this embodiment discloses a mine resource utilization system for reusing resources in abandoned mines, including a first power generation unit 1, an ammonium bicarbonate synthesis unit 2, a second power generation unit 3 and a recovery unit 4. The first power generation unit 1 is connected to the mine water 5, and can use the mine water for hydroelectric power generation. The second power generation unit 3 is connected to the mine goaf 6, and can use the gas in the mine goaf to generate electricity. The first power generation unit 1 and the second power generation unit 3 are respectively connected to the ammonium bicarbonate synthesis unit 2, and can continuously provide electricity to the ammonium bicarbonate synthesis unit to ensure that the power required by the ammonium bicarbonate synthesis unit is sufficient, so that the ammonium bicarbonate synthesis unit can continuously produce ammonium bicarbonate. The recovery unit 4 is located between the second power generation unit 3 and the ammonium bicarbonate synthesis unit 2 and is connected, and is used to recover the carbon dioxide and nitrogen in the flue gas generated by the second power generation unit 3 when generating gas and provide them to the ammonium bicarbonate synthesis unit as raw materials for ammonium bicarbonate synthesis.

[0022] In the mine resource utilization system of the present embodiment, by setting a first power generation unit, an ammonium bicarbonate synthesis unit, a second power generation unit and a recovery unit, the mine water and gas in the mine are used to generate electricity by means of the first power generation unit and the second power generation unit respectively, and the electricity is provided to the ammonium bicarbonate synthesis unit to synthesize ammonium bicarbonate as a raw material for nitrogen fertilizer, so that the mine water and the residual gas in the mine can be utilized as resources, thereby achieving the effect of improving the resource utilization rate of the mine. At the same time, the recovery unit is used to recover the carbon dioxide and nitrogen in the flue gas generated by the second power generation unit as the raw materials required by the ammonium bicarbonate synthesis unit, thereby improving the environmental protection of the mine resource utilization system and achieving the technical effect of zero emission of environmental pollutants and carbon dioxide.

[0023] Combination Figure 1 As shown, in this embodiment, the first power generation unit 1 includes a high-level water reservoir 11, a hydroelectric generator 12 and a low-level water reservoir 13. The mine water 5 is connected to the water inlet at the upper end of the high-level water reservoir 11, and the high-level water reservoir 11, the hydroelectric generator 12 and the low-level water reservoir 13 are connected in pairs, that is, the water outlet at the bottom of the high-level water reservoir 11 and the water inlet of the hydroelectric generator 12, the water outlet of the hydroelectric generator 12 and the water inlet of the low-level water reservoir 13, and the water outlet of the low-level water reservoir 13 and the water inlet of the high-level water reservoir 11 are respectively connected. The height of the high-level water reservoir 11 is higher than the height of the hydroelectric generator 12 and the height of the low-level water reservoir 13, which can increase the potential energy of the mine water and facilitate the use of the potential energy of the mine water for power generation.

[0024] Among them, preferably, a switch valve is provided between the water outlet at the bottom of the high-level water storage tank and the hydraulic generator, and the switch valve can automatically control the opening and stopping of the drainage of the high-level water storage tank, thereby improving the simplicity of control.

[0025] Specifically, since the gas concentration in the goaf of the mine is unstable, when the gas concentration is high, for example, the methane volume concentration in the gas is detected by the methane content detector to be ≥6%, the power generation of the second power generation unit 3 at this time is sufficient for the ammonium bicarbonate synthesis unit 2 to use, then the first power generation unit 1 does not need to generate electricity, and only needs to transport the mine water 5 to the high-level water storage tank 11. When the gas concentration is low, for example, the methane volume concentration in the gas is detected by the methane content detector to be ≤6%, that is, when the power generation of the second power generation unit 3 is insufficient to provide the ammonium bicarbonate synthesis unit 2 for use, the switch valve is opened, and the water in the high-level water storage tank 11 drives the hydroelectric generator 12 to generate electricity, and the electricity is used to drive the ammonium bicarbonate synthesis unit 2 to synthesize ammonium bicarbonate. The water after driving the hydroelectric generator 12 to generate electricity is collected in the low-level water storage tank 13, and when the power generation of the second power generation unit is sufficient, it is further transported to the high-level water storage tank 11, so that the mine water can be recycled, thereby improving the utilization rate of water resources in the mine. At the same time, the first power generation unit and the second power generation unit work together to not only achieve peak shaving and valley filling of electricity and improve energy utilization, but also continuously provide electricity to the ammonium bicarbonate synthesis unit, thereby improving the working efficiency of the ammonium bicarbonate synthesis unit.

[0026] Preferably, the high-level water storage tank is built by utilizing the mine goaf close to the ground in the mine, and the low-level water storage tank is built by utilizing the mine goaf above the mine water. This can fully utilize the area of ​​the mine goaf, thereby reducing the cost of the mine resource utilization system.

[0027] Further, preferably, the first power generation unit 1 further includes a first pump 14 and a second pump 15. The first pump 14 is located between and connected to the mine water 5 and the high-level water reservoir 11, and is used to automatically pump the mine water into the high-level water reservoir, thereby improving the speed and convenience of pumping water. The second pump 15 is located between and connected to the high-level water reservoir 11 and the low-level water reservoir 13, and is used to pump water from the low-level water reservoir into the high-level water reservoir, thereby improving the convenience of water circulation.

[0028] Among them, the second power generation unit 3 is also electrically connected to the first water pump 14 and the second water pump 15 respectively, and is used to replace the external electric energy with the excess electric energy generated by the second power generation unit 3 in the peak stage to drive the first water pump 14 and the second water pump 15 to work, thereby forming the mutual coordination of the first power generation unit and the second power generation unit, thereby improving the utilization rate of mine resources by the system.

[0029] Combination Figure 1 As shown, in this embodiment, the second power generation unit 3 includes a gas generator 31. The air inlet of the gas generator 31 is connected to the mine goaf 6, which is used to collect gas in the mine goaf and generate electricity. The power transmission end of the gas generator 31 is connected to the ammonium bicarbonate synthesis unit 2, which is used to supply power to the ammonium bicarbonate synthesis unit.

[0030] Specifically, the gas in the mine goaf 6 is transmitted to the gas generator 31, which can be an internal combustion generator or a gas turbine, which uses the gas to generate electricity and provide electrical energy to the ammonium bicarbonate synthesis unit, thereby improving the utilization rate of gas energy in the mine.

[0031] Preferably, the second power generation unit 3 further includes a gas purifier 32, specifically including a dust collector and a desulfurizer. The gas purifier 32 is located between and connected to the mine goaf 6 and the gas generator 31, and is used to remove dust and sulfur-containing substances in the gas in the mine goaf to ensure the safe operation of the second power generation equipment, and at the same time can avoid the gas combustion in the gas generator to generate sulfide and cause air pollution.

[0032] Further, preferably, the second power generation unit 3 further includes an air pump 33. The air pump 33 is located between the mine goaf 6 and the gas purifier 32 and is respectively connected to automatically extract the gas in the mine goaf into the gas generator to realize automatic extraction and utilization of the gas in the mine goaf, thereby improving the simplicity of gas extraction.

[0033] In addition, in this embodiment, the recovery unit 4 includes a gas separation device 41 and a waste heat boiler 44. The air inlet of the waste heat boiler 44 is connected to the air outlet of the gas generator 31, and the flue gas outlet of the waste heat boiler 44 is connected to the gas separation device 41. The gas separation device 41 is used to extract carbon dioxide and nitrogen from the flue gas and separate carbon dioxide and nitrogen. The carbon dioxide outlet of the gas separation device 41 and the nitrogen outlet of the gas separation device 41 are respectively connected to the ammonium bicarbonate synthesis unit 2, and are used to transmit carbon dioxide and nitrogen as ammonium bicarbonate synthesis raw materials to the ammonium bicarbonate synthesis unit.

[0034] Specifically, the waste heat boiler 44 can recover the heat of the high-temperature flue gas (temperature range between 400°C and 550°C) discharged by the gas generator 31, and use this part of the heat to heat the water in the waste heat boiler 44 to generate steam to form heat replacement. The waste heat boiler 44 transports the steam to the working plant 45 of the mine resource utilization system, which can be used for heating and daily hot water, and can achieve the energy cascade utilization of gas, thereby achieving the effect of improving energy utilization. The temperature of the flue gas after replacement is reduced, and the low-temperature flue gas is discharged into the gas separation device 41 through the flue gas outlet of the waste heat boiler 44. The gas separation device is used to extract carbon dioxide and nitrogen in the low-temperature flue gas and use them as raw materials for the synthesis of ammonium bicarbonate, which not only avoids the emission of carbon dioxide into the air to cause a greenhouse effect, but also improves environmental protection, and can achieve zero emission of waste in the mine resource utilization system.

[0035] Further, preferably, the recovery unit 4 also includes a nitrogen purifier 42 and a carbon dioxide purifier 43. The nitrogen purifier 42 is located between the nitrogen outlet of the gas separation device 41 and the ammonium bicarbonate synthesis unit 2, and is used to remove impurities in the nitrogen to improve the purity of the nitrogen, so that the nitrogen purity is ≥98%, which is conducive to improving the efficiency of the ammonium bicarbonate synthesis process. The carbon dioxide purifier 43 is located between the carbon dioxide outlet of the gas separation device 41 and the ammonium bicarbonate synthesis unit 2, and is used to remove impurities in the carbon dioxide gas to improve the purity of the carbon dioxide gas, so that the carbon dioxide purity is ≥95%, thereby achieving the effect of improving the efficiency of ammonium bicarbonate synthesis and energy utilization.

[0036] Combination Figure 1 As shown, the ammonium bicarbonate synthesis unit 2 includes an electrolytic water device 21 and an ammonium bicarbonate synthesizer 22. The electrolytic water device 21 is connected to the hydroelectric generator 12 and the gas generator 31 respectively, and can use the hydroelectric generator and the gas generator to provide electrical energy for the electrolytic water device without external energy supply. The electrolytic water device 21 is connected to the water source and the ammonium bicarbonate synthesizer 22 respectively, and is used to transport the hydrogen with a purity of ≥99% generated by the electrolytic water device to the ammonium bicarbonate synthesizer as a raw material for ammonium bicarbonate synthesis. The ammonium bicarbonate synthesizer 22 is connected to the nitrogen purifier 42 and the carbon dioxide purifier 43 in the recovery unit 4 respectively, and can use the carbon dioxide and nitrogen in the recovery unit as raw materials to synthesize ammonium bicarbonate.

[0037] Preferably, the water electrolysis device 21 is connected to the gas generator 31, so that the oxygen generated by the water electrolysis device 21 can be introduced into the gas generator 31, ensuring that the gas can be completely burned and improving the combustion efficiency of the gas.

[0038] In this embodiment, the low-level water storage tank 13 is connected to the water electrolysis equipment 21 and is used as a water source for the water electrolysis equipment. This eliminates the need to use resources outside the mine, thereby improving the utilization rate of resources inside the mine.

[0039] Of course, in other embodiments, the mine water can also be connected to the water electrolysis equipment, which can also achieve the effect of utilizing the resources inside the mine to synthesize ammonium bicarbonate and improve the utilization rate of the resources inside the mine.

[0040] Among them, combined Figure 1 As shown, preferably, the ammonium bicarbonate synthesis unit 2 also includes a water treatment unit 25. The water treatment unit 25 is located between the low-level water reservoir 13 and the water electrolysis device 21 and is connected to remove impurities in the low-level water reservoir, such as calcium and magnesium ions, carbonates, and solid impurities, so that the water quality meets the requirements of electrolysis water: iron ion content <1.0 mg / L, chloride ion content <2.0 mg / L, suspended solids <1.0 mg / L, resistivity ≥1.0×10 5 Ω·cm, thereby improving the electrolysis efficiency of the water electrolysis equipment.

[0041] Further, preferably, the ammonium bicarbonate synthesis unit 2 further includes an ammonia synthesis device 23. The ammonia synthesis device 23 is located between and connected to the nitrogen purifier 42 and the ammonium bicarbonate synthesizer 22, and is also located between and connected to the water electrolysis device 21 and the ammonium bicarbonate synthesizer 22. In this way, nitrogen and hydrogen are first transported to the ammonia synthesis device, such as an ammonia synthesis reactor, and ammonia can be synthesized by using nitrogen and hydrogen first, and then the ammonia is collected and taken as needed according to the ammonia required in the ammonium bicarbonate synthesizer, thereby avoiding waste of ammonia.

[0042] Combination Figure 1 As shown, in this embodiment, the ammonium bicarbonate synthesis unit 2 further includes an ammonia storage tank 24. The ammonia storage tank 24 is located between the ammonia synthesis equipment 23 and the ammonium bicarbonate synthesizer 22 and is connected respectively, and can collect ammonia into the ammonia storage tank. When the ammonia is sufficient for the use of the ammonium bicarbonate synthesizer and there is surplus, the collected ammonia can be used in the coal-fired power plant instead of the traditional fossil fuel that is not easy to regenerate. The combustion of ammonia does not produce pollutants and greenhouse gases, such as carbon dioxide, and can improve the protection of the atmospheric environment.

[0043] In addition, in this embodiment, the outlet of the ammonia storage tank 24 can be connected to the water treatment unit 25, and ammonia gas is dissolved in water to form ammonia water, which is then transmitted to the ammonium bicarbonate synthesizer and reacts with carbon dioxide to form ammonium bicarbonate. Ammonium bicarbonate can be used as the main material of nitrogen fertilizer to provide ammonium nitrogen and carbon dioxide required for crop growth, thereby achieving the technical effect of promoting crop growth and photosynthesis.

[0044] Among them, the process of the ammonium bicarbonate synthesis unit is:

[0045] ①N2+H2→NH3; ②NH3+H2O→NH3·H2O; ③NH3·H2O+CO2→NH4HCO3

[0046] The above is only a specific embodiment of the present invention. Under the above teachings of the present invention, those skilled in the art can make other improvements or modifications on the basis of the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of the present invention, and the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A mine resource utilization system, characterized in that: It comprises a first power generation unit, an ammonium bicarbonate synthesis unit, a second power generation unit and a recovery unit; the first power generation unit is connected to the mine water, and is used to extract the mine water for hydroelectric power generation; the second power generation unit is connected to the mine goaf, and is used to extract gas in the mine goaf for power generation; the first power generation unit and the second power generation unit are connected to the ammonium bicarbonate synthesis unit, and are used to continuously provide power to the ammonium bicarbonate synthesis unit; the recovery unit is located between the second power generation unit and the ammonium bicarbonate synthesis unit, and is used to recover carbon dioxide and nitrogen in the flue gas generated by the second power generation unit and provide them to the ammonium bicarbonate synthesis unit as raw materials for ammonium bicarbonate synthesis; When the gas power generation in the second power generation unit is not less than the power required by the ammonium bicarbonate synthesis unit, the second power generation unit supplies power to the ammonium bicarbonate synthesis unit; when the gas power generation in the second power generation unit is less than the power required by the ammonium bicarbonate synthesis unit, the second power generation unit and the first power generation unit supply power to the ammonium bicarbonate synthesis unit; The first power generation unit comprises a high-level water reservoir, a hydroelectric generator and a low-level water reservoir; the height of the high-level water reservoir is higher than the height of the hydroelectric generator; the high-level water reservoir is connected to mine water, and the high-level water reservoir, the hydroelectric generator and the low-level water reservoir are connected in pairs for recycling of mine water; The ammonium bicarbonate synthesis unit comprises a water electrolysis device and an ammonium bicarbonate synthesizer; the hydroelectric generator and the second power generation unit are respectively connected to the water electrolysis device for supplying power to the water electrolysis device; the water electrolysis device is respectively connected to a water source and the ammonium bicarbonate synthesizer for transporting hydrogen generated by water electrolysis to the ammonium bicarbonate synthesizer as a raw material for ammonium bicarbonate synthesis; the recovery unit is connected to the ammonium bicarbonate synthesizer for providing carbon dioxide and nitrogen as raw materials to the ammonium bicarbonate synthesizer for synthesizing ammonium bicarbonate; The ammonium bicarbonate synthesis unit further comprises an ammonia synthesis device; the ammonia synthesis device is located between the water electrolysis device and the ammonium bicarbonate synthesizer, and the ammonia synthesis device is connected to the recovery unit, and is used to synthesize ammonia from hydrogen and nitrogen as an ammonium bicarbonate synthesis raw material and transport it to the ammonium bicarbonate synthesizer; The second power generation unit comprises a gas generator; the gas generator is connected to the mine goaf and the ammonium bicarbonate synthesis unit respectively, and is used to recover the gas in the mine goaf to generate electricity and supply power to the water electrolysis equipment; The recovery unit includes a waste heat boiler and a gas separation device; the air inlet of the waste heat boiler is connected to the gas generator, and the air outlet of the waste heat boiler is connected to the gas separation device, so as to recover the heat of the flue gas generated by the gas generator; the gas separation device is used to collect and separate carbon dioxide and nitrogen in the flue gas, the nitrogen outlet of the gas separation device is connected to the ammonia synthesis device, and the carbon dioxide gas outlet of the gas separation device is connected to the ammonium bicarbonate synthesizer.

2. The mine resource utilization system according to claim 1, characterized in that: The low-level water storage tank is connected to the water electrolysis equipment and is used as a water source for the water electrolysis equipment.

3. The mine resource utilization system according to claim 2, characterized in that: The ammonium bicarbonate synthesis unit also includes a water treatment unit; the water treatment unit is connected to the low-level water reservoir and the water electrolysis equipment respectively, and is used to remove impurities from the water in the low-level water reservoir before transporting it to the water electrolysis equipment.

4. The mine resource utilization system according to claim 1, characterized in that: The second power generation unit includes a gas purifier; the gas purifier is connected to the mine goaf and the gas generator respectively, and is used to generate electricity from the gas after removing impurities.

5. The mine resource utilization system according to claim 1, characterized in that: The recovery unit also includes a nitrogen purifier and a carbon dioxide purifier; the carbon dioxide purifier is located between the carbon dioxide gas outlet of the gas separation equipment and the ammonium bicarbonate synthesizer, and is used to remove impurities in the carbon dioxide; the nitrogen purifier is located between the nitrogen outlet of the gas separation equipment and the ammonia synthesis equipment, and is used to remove impurities in the nitrogen.

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