A system and method for recycling abandoned coal mine resources

Abstract

The present application belongs to the technical field of environmental protection and solid waste resource utilization, and relates to a waste coal mine resource utilization system and method, which comprises a coal gangue pretreatment system, a dewatering water pretreatment system, a hydrogen production and storage system, a photovoltaic system and a soil remediation system; the coal gangue pretreatment system is connected with the hydrogen production and storage system and the soil remediation system respectively; the dewatering water pretreatment system is connected with the hydrogen production and storage system and the soil remediation system respectively; the photovoltaic system is connected with the hydrogen production and storage system; the present application realizes the resource utilization of waste and the production of clean energy at the same time, realizes the ecological remediation of waste coal mine, and has the characteristics of green, low carbon and resource comprehensive utilization.

Description

Technical Field

[0001] This invention belongs to the field of environmental protection and solid waste resource utilization technology, and relates to a system and method for the resource utilization of abandoned coal mines. Background Technology

[0002] With the continued growth of global energy demand, coal mining activities have become increasingly frequent. This trend has not only met the energy needs of economic development but has also led to the problem of numerous abandoned mines after resource depletion. These abandoned mines are not only historical witnesses to past energy extraction but also treasure troves containing abundant potential resources, including coal gangue and coalbed methane. However, the potential value of these resources has not been fully explored and utilized; instead, due to mismanagement and inadequate treatment, they have become a heavy burden on the environment and society.

[0003] Waste from abandoned coal mines, especially coal gangue, not only occupies valuable land resources due to its large accumulation, but also poses a potential threat to the environment and ecosystems due to its unstable physical and chemical properties. Under the influence of the natural environment, coal gangue is prone to weathering and leaching, releasing pollutants such as heavy metals and harmful chemicals. These pollutants spread through the soil, water sources, and even the atmosphere, posing a long-term threat to ecosystems. Soil pollution may lead to reduced crop yields or even crop failure, water pollution directly threatens the safety of drinking water for humans and other organisms, and air pollution may cause respiratory diseases and other health problems.

[0004] Meanwhile, the issue of drainage water generated during coal mining is equally significant. Drainage water, extracted to lower the water table and ensure mining safety, is vast in volume and contains various pollutants, including suspended solids, dissolved solids, heavy metal ions, and organic pollutants. Direct discharge not only wastes valuable freshwater resources but also potentially causes serious pollution to the surrounding water environment, affecting groundwater quality and threatening drinking water safety and ecosystem health. Especially given today's increasingly scarce water resources, the rational utilization and purification of drainage water is of paramount importance.

[0005] To address the aforementioned issues, effectively utilizing waste materials and drainage water from abandoned coal mines has become a crucial and urgent problem to be solved. On the one hand, it is necessary to explore resource-based utilization pathways for waste materials such as coal gangue, transforming them into valuable building materials and energy products through technological innovation and industrial upgrading, thereby achieving resource recycling. On the other hand, it is essential to strengthen research on purification technologies for drainage water, removing pollutants through advanced physical, chemical, or biological treatment methods to meet reuse standards for agricultural irrigation, industrial cooling, urban water supply, and other applications, thereby reducing dependence on and pollution of natural water resources. Summary of the Invention

[0006] The purpose of this invention is to solve the problems in the prior art and provide a system and method for the resource utilization of abandoned coal mines. This system and method realize the resource utilization of waste while producing clean energy and achieve the ecological restoration of abandoned coal mines. It has the characteristics of being green, low-carbon and comprehensively utilizing resources.

[0007] To achieve the above objectives, the present invention employs the following technical solution:

[0008] In a first aspect, the present invention provides a waste coal mine resource utilization system, comprising a coal gangue pretreatment system, a drainage water pretreatment system, a hydrogen production and storage system, a photovoltaic system, and a soil remediation system; the coal gangue pretreatment system is connected to the hydrogen production and storage system and the soil remediation system respectively; the drainage water pretreatment system is connected to the hydrogen production and storage system and the soil remediation system respectively; and the photovoltaic system and the hydrogen production and storage system are connected.

[0009] Preferably, the coal gangue pretreatment system includes a coal gangue pretreatment device, a coal gangue modification device, and an aerobic fermentation device connected in sequence; the aerobic fermentation device is connected to a hydrogen production and storage system and a soil remediation system, respectively.

[0010] Preferably, the drain water pretreatment system includes a drain water pretreatment device, a drain water filtration device, a first water tank, an ultrafiltration device, a reverse osmosis device, and a second water tank connected in sequence; the first water tank is connected to the soil remediation system; and the second water tank is connected to the hydrogen production and storage system.

[0011] Preferably, the hydrogen production and storage system includes a hydrogen production device, a hydrogen compression device, an underground gas storage system, and a hydrogen purification device connected in sequence; the hydrogen production device is connected to a photovoltaic system and a drainage pretreatment system respectively; and the hydrogen compression device is connected to a coal gangue pretreatment system.

[0012] Preferably, the hydrogen production equipment includes a second water inlet, an electrolyzer, an oxygen outlet, and a first hydrogen outlet; the second water inlet is disposed on the side wall of the electrolyzer; the oxygen outlet and the first hydrogen outlet are disposed alternately at the top of the electrolyzer; the second water inlet is connected to a drain water pretreatment system; the first hydrogen outlet is connected to a hydrogen compression device; and the electrolyzer is connected to a photovoltaic system.

[0013] Preferably, the hydrogen compression device has a hydrogen inlet and a heat recovery device on its side wall; a second hydrogen outlet is provided on the top of the hydrogen compression device; the hydrogen inlet is connected to a hydrogen production device; and the second hydrogen outlet is connected to an underground gas storage system.

[0014] Preferably, the underground gas storage system includes a gas storage tank; a third gas inlet and a second gas outlet are respectively provided on both sides of the gas storage tank and connected thereto; the third gas inlet is connected to a hydrogen compression device; and the second gas outlet is connected to a hydrogen purification device.

[0015] Preferably, the hydrogen purification device has a fourth air inlet on its side wall; a third air outlet is provided at the bottom of the hydrogen purification device; and the fourth air inlet is connected to an underground gas storage system.

[0016] Preferably, the soil remediation system includes improved soil; giant reed grass is placed on top of the improved soil; water distribution pipes are arranged around the bottom of the giant reed grass; the improved soil is connected to a coal gangue pretreatment system; and the water distribution pipes are connected to a drainage water pretreatment system.

[0017] Secondly, the present invention provides a method for the resource utilization of abandoned coal mines, the method specifically including the following steps:

[0018] Coal gangue is crushed by coal gangue pretreatment equipment, and then modified by coal gangue modification equipment; the modified coal gangue is temporarily stored in aerobic fermentation equipment.

[0019] The drain water undergoes mud-water separation in the drain water pretreatment equipment. The resulting sludge is discharged to the aerobic fermentation equipment, and the drain water enters the drain water filtration device for further purification. The purified water is temporarily stored in the first water tank. Part of the water in the first water tank is used directly as the water source for irrigation of the soil remediation system, and the other part enters the ultrafiltration device for deep treatment. The water after deep treatment enters the reverse osmosis device for further treatment and is then temporarily stored in the second water tank.

[0020] Water from the second tank enters the hydrogen production equipment for electrolysis to produce oxygen and hydrogen. The electricity required for the electrolysis process comes from the photovoltaic system. The oxygen is collected and purified and used as ventilation gas during underground mining operations. The hydrogen enters the hydrogen compression equipment for compression, and the compressed hydrogen enters the underground gas storage system for storage. The hydrogen stored in the underground gas storage system is periodically discharged, purified by the hydrogen purification equipment, and then transported by tank truck for hydrogen refueling of heavy-duty trucks in the mining area.

[0021] Crushed crop straw collected from the surrounding area, kitchen waste from the mining area's living quarters, sludge from the drainage pretreatment equipment, and modified coal gangue are fermented in an aerobic fermentation device. The heat required for fermentation comes from a hydrogen compression device. The fermented and decomposed material is discharged and temporarily stored as a soil conditioner for the soil remediation system. The soil conditioner is added to the soil to be improved to form improved soil. Giant Napier grass is planted on the improved soil for soil remediation. Water is regularly supplied from the first water tank and distributed through the water distribution pipe for irrigation to ensure the water required for the growth of giant Napier grass. After a certain growth cycle, the giant Napier grass is harvested, crushed, and used as raw material for further utilization in the aerobic fermentation device.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This invention uses coal gangue as raw material, and through a coal gangue pretreatment system, crushes, modifies, and aerobic ferments it to produce a soil conditioner for mine remediation; it uses drain water as raw material, and through a drain water pretreatment system and a hydrogen production and storage system, it produces hydrogen, which is then used in heavy-duty trucks transporting coal; it utilizes the ground space of abandoned coal mines to deploy distributed photovoltaic systems; this invention can realize the resource utilization of waste and zero-waste emissions, improve the ecological environment of mining areas, achieve mine ecological restoration, promote the high-quality development of photovoltaic energy, and promote the development of the "photovoltaic + multi-industry" integration model, providing a new approach for mine remediation and the resource utilization and ecological restoration of abandoned coal mines in my country. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a waste coal mine resource utilization system according to the present invention;

[0026] The equipment includes: 1. Coal gangue pretreatment equipment; 101. First motor; 102. Second motor; 103. Third motor; 104. Support leg; 105. First feed hopper; 106. Coarse crushing roller shaft; 107. Fine crushing roller shaft; 108. First collection hopper; 109. Upper plate; 110. Lower plate; 111. Lifting shaft; 112. Support platform; 113. Bracket; 114. Second collection hopper; 115. First discharge port; 2. Coal gangue modification equipment; 201. Second feed hopper; 202. Mixing tank; 203. Agitator; 204. Discharge pipe; 205. Atomizer; 206. Air 207. Heater; 208. Booster Fan; 209. First Air Inlet; 210. Air Distribution Pipe; 211. First Air Outlet; 212. Storage Hopper; 213. Second Discharge Outlet; 3. Aerobic Fermentation Equipment; 301. Third Feed Hopper; 302. Mixing Shaft; 303. Fermentation Chamber; 304. Second Air Inlet; 305. Third Discharge Outlet; 4. Drainage Pretreatment Equipment; 401. Chemical Dosing Port; 402. First Water Inlet; 403. Fixed Shaft; 404. Moving Agitator; 405. Partition Wall; 406. Sludge Hopper; 407. Sludge Outlet; 408. Overflow Tank; 409. First Liquid Outlet; 410. 5. Inclined plate; 6. Drainage water filtration device; 501. Second outlet; 502. Quartz sand layer; 503. Activated carbon layer; 504. Zeolite layer; 505. Inlet; 6. Ultrafiltration device; 601. Ultrafiltration inlet; 602. Ultrafiltration membrane module; 603. Ultrafiltration outlet; 7. First water tank; 701. First water tank inlet; 702. First water tank outlet; 8. Reverse osmosis device; 801. Reverse osmosis inlet; 802. Reverse osmosis membrane module; 803. Reverse osmosis outlet; 9. Second water tank; 901. Second water tank inlet; 902. Second water tank outlet; 10. Hydrogen production equipment ; 1001, Second water inlet; 1002, Electrolyzer; 1003, Oxygen outlet; 1004, First hydrogen outlet; 11, Hydrogen compression equipment; 1101, Hydrogen inlet; 1102, Second hydrogen outlet; 1103, Heat recovery equipment; 12, Underground gas storage system; 1201, Third air inlet; 1202, Second air outlet; 1203, Gas storage tank; 13, Hydrogen purification equipment; 1301, Fourth air inlet; 1302, Third air outlet; 14, Photovoltaic system; 15, Soil remediation system; 1501, Soil improvement; 1502, Water distribution pipe; 1503, Giant Napier grass. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0033] The present invention will now be described in further detail with reference to the accompanying drawings:

[0034] like Figure 1As shown, the first objective of this invention is to provide a waste coal mine resource utilization system, including a coal gangue pretreatment system, a drainage water pretreatment system, a hydrogen production and storage system, a photovoltaic system 14, and a soil remediation system 15; the coal gangue pretreatment system is connected to the hydrogen production and storage system and the soil remediation system 15 respectively; the drainage water pretreatment system is connected to the hydrogen production and storage system and the soil remediation system 15 respectively; the photovoltaic system 14 is connected to the hydrogen production and storage system.

[0035] The coal gangue pretreatment system includes a coal gangue pretreatment device 1, a coal gangue modification device 2, and an aerobic fermentation device 3 connected in sequence; the aerobic fermentation device 3 is connected to the hydrogen production and storage system and the soil remediation system 15, respectively.

[0036] The coal gangue pretreatment equipment 1 is provided with a first feed hopper 105 at the top; the first feed hopper 105 is connected to a coarse crushing roller shaft 106; a fine crushing roller shaft 107 is provided below the coarse crushing roller shaft 106; a first collecting hopper 108 is provided below the fine crushing roller shaft 107; the first collecting hopper 108 is connected to an upper plate 109; a lower plate 110 is provided below the upper plate 109; the upper part of the lower plate 110 protrudes upward, and a gap structure is provided between the upper plate 109 and the lower plate 110; the upper plate 109 is provided with a central channel; the central channel is divided into... The first collection hopper 108 and the void structure are not connected; the lower plate 110 is connected to the lifting shaft 111; a second collection hopper 114 is provided below the lower plate 110; multiple supports 113 are provided on the second collection hopper 114; multiple supports 113 are connected to the support platform 112; the lifting shaft 111 is connected to the support platform 112; a first discharge port 115 is provided at the bottom of the coal gangue pretreatment equipment 1; the first discharge port 115 is connected to the second collection hopper 114; the first discharge port 115 is connected to the coal gangue modification equipment 2.

[0037] The coal gangue pretreatment equipment 1 is equipped with a first motor 101, a second motor 102, and a third motor 103 on its outer wall. The coarse crushing roller shaft 106 is connected to the first motor 101; the fine crushing roller shaft 107 is connected to the second motor 102; and the lifting shaft 111 is connected to the third motor 103. The first motor 101 and the second motor 102 provide power to the coarse crushing roller shaft 106 and the fine crushing roller shaft 107, respectively, driving them to rotate. This ensures that the coal gangue is quickly crushed into smaller particles after entering the equipment. By adjusting the motor speed, the crushing force and efficiency can be controlled, thus adapting to coal gangue of different hardness and particle size. The third motor 103 drives the lifting shaft 111 to rise, further crushing the coal gangue.

[0038] The internal space of the void structure gradually decreases from the center to the edge, and the crushed coal gangue falls from the edge of the void structure.

[0039] Both the first collection hopper 108 and the second collection hopper 114 are funnel-shaped; the funnel-shaped design allows the crushed coal gangue particles to flow smoothly into the lower area, avoiding the accumulation or blockage of materials in the collection hopper.

[0040] The coal gangue pretreatment equipment 1 is equipped with support legs 104 at the bottom, which support the entire equipment.

[0041] The coal gangue modification equipment 2 is equipped with a second feed hopper 201 at the top; the second feed hopper 201 is used to feed coal gangue, binder, foaming agent and water. The second feed hopper 201 is connected to the first discharge port 115 of the coal gangue pretreatment equipment 1; the coal gangue modification equipment 2 is equipped with a mixing tank 202 inside; the mixing tank 202 is connected to the second feed hopper 201; the mixing tank 202 is equipped with a stirrer 203 inside; the stirrer 203 is used to accelerate the mixing process of coal gangue and modifier. By rotating or swinging, the stirrer 203 can break up the agglomeration between materials and promote the uniform distribution of modifier among coal gangue particles. The bottom of the mixing tank 202 is provided with a liquid outlet pipe 204; the liquid outlet pipe 204 is connected to an atomizer 205; multiple air distribution pipes 209 are provided below the atomizer 205; each of the multiple air distribution pipes 209 is connected to a first air inlet 208; a storage hopper 211 is provided below the air distribution pipes 209; a second discharge port 212 is provided at the bottom of the coal gangue modification equipment 2; the second discharge port 212 is connected to the storage hopper 211 and the aerobic fermentation equipment 3 respectively. A first air outlet 210 is provided on the side wall of the coal gangue modification equipment 2, and the waste gas generated during the modification process is discharged in compliance with standards.

[0042] The coal gangue modification equipment 2 is externally equipped with a booster fan 207 and an air heater 206; the first air inlet 208 is connected to the booster fan 207; the booster fan 207 is connected to the air heater 206. The air heater 206 can heat the gas entering the coal gangue modification equipment 2 to the required temperature. The heated gas can more effectively promote the reaction between the coal gangue particles and the modifier. Through the pressure provided by the booster fan 207, the gas can be more evenly distributed between the coal gangue particles, promoting the full contact and reaction of the binder, foaming agent, and water with the coal gangue.

[0043] The aerobic fermentation equipment 3 includes a fermentation chamber 303; a third feed hopper 301 is provided at the top of the fermentation chamber 303; the third feed hopper 301 is connected to the second discharge port 212 of the coal gangue modification equipment 2; a third discharge port 305 is provided at the bottom of the fermentation chamber 303; a second air inlet 304 is provided on the side of the fermentation chamber 303, through which oxygen required for fermentation enters, and the heat required for fermentation comes from the heat recovery device 1103 of the hydrogen compression device 11. Multiple mixing shafts 302 are provided inside the third feed hopper 301, which can effectively mix different types of materials.

[0044] The drain water pretreatment system includes a drain water pretreatment device 4, a drain water filtration device 5, a first water tank 7, an ultrafiltration device 6, a reverse osmosis device 8, and a second water tank 9 connected in sequence. The first water tank 7 is connected to the soil remediation system 15; the second water tank 9 is connected to the hydrogen production and storage system. Through pretreatment, filtration, ultrafiltration, and reverse osmosis, the drain water pretreatment system converts drain water into irrigation water and hydrogen production water source. This achieves water resource recycling, avoids water waste, and provides clean and sustainable raw materials for the hydrogen production process.

[0045] The drain water pretreatment equipment 4 is a concrete tank with a first inlet 402 and a first outlet 409 on its side wall. The first outlet 409 is connected to the drain water filter device 5. An overflow trough 408 is provided on the inner wall of the drain water pretreatment equipment 4. The overflow trough 408 is connected to the first outlet 409. A partition wall 405 is provided inside the drain water pretreatment equipment 4. A movable agitator 404 is provided on one side of the partition wall 405, and an inclined plate 410 is provided on the other side. The movable agitator 404 is connected to a fixed shaft 403. The fixed shaft 403 is located on the inner wall of the drain water pretreatment equipment 4. A sludge hopper 406 is provided at the bottom of the inclined plate 410. A sludge outlet 407 is provided at the bottom of the drain water pretreatment equipment 4. The sludge hopper 406 and the sludge outlet 407 are connected. The drain water pretreatment device 4 is equipped with a dosing port 401 at its top, located above the mobile agitator 404. The dosing port 401 allows the addition of chemical agents such as polyaluminum chloride (PAC) and polyacrylamide (PAM) to the drain water, promoting the coagulation and sedimentation of suspended solids. Stable support is provided by the fixed shaft 403, enabling the mobile agitator 404 to efficiently stir the mixture of drain water and chemicals, ensuring the chemicals are fully dissolved and evenly dispersed, thereby improving mixing efficiency and accelerating the coagulation process of suspended solids. The inclined plate 410 accelerates sedimentation of the mixture, separating sludge from water. The settled sludge is collected in the settling hopper 406 and discharged through the sludge outlet 407. The supernatant after sedimentation overflows through the overflow trough 408 and enters the drain water filtration device 5.

[0046] The drain water filtration device 5 has an inlet 505 at its bottom and a second outlet 501 at its top. The inlet 505 is connected to the first outlet 409, and the second outlet 501 is connected to the first water tank 7. The drain water filtration device 5 contains a filter layer, which, from top to bottom, includes a quartz sand layer 502, an activated carbon layer 503, and a zeolite layer 504. Quartz sand, as the filter medium, removes suspended solids, colloids, and other impurities from the water, thus performing physical filtration. Activated carbon has a strong adsorption capacity, removing organic matter, residual chlorine, color, etc., further purifying the water. Zeolite has excellent adsorption properties, effectively removing heavy metal ions, ammonia nitrogen, and other harmful substances from the water, improving water quality. Through the synergistic effect of the quartz sand layer 502, activated carbon layer 503, and zeolite layer 504, multi-stage filtration and purification of the drain water are achieved, effectively removing harmful substances and impurities from the water.

[0047] The first water tank 7 has a first water tank inlet 701 at its top; the first water tank inlet 701 is connected to a second outlet 501; the first water tank 7 has a first water tank outlet 702 at its bottom side wall; the first water tank outlet 702 is connected to the ultrafiltration device 6; part of the water stored in the first water tank 7 is used for irrigation of the soil remediation system 15, and the other part is further treated to serve as a water source for hydrogen production. The first water tank outlet 702 is connected to the water distribution pipe 1502 and the ultrafiltration inlet 601 of the soil remediation system 15.

[0048] The ultrafiltration device 6 includes an ultrafiltration inlet 601, an ultrafiltration membrane module 602, and an ultrafiltration outlet 603; the ultrafiltration inlet 601 and the ultrafiltration outlet 603 are connected by the ultrafiltration membrane module 602; the ultrafiltration inlet 601 is connected to the outlet 702 of the first water tank; and the ultrafiltration outlet 603 is connected to the reverse osmosis device 8. The membrane module has excellent separation performance, effectively removing impurities such as tiny particles, bacteria, and viruses from the water while retaining minerals and trace elements.

[0049] The reverse osmosis device 8 includes a reverse osmosis inlet 801, a reverse osmosis membrane module 802, and a reverse osmosis outlet 803. The reverse osmosis inlet 801 and the reverse osmosis outlet 803 are connected by the reverse osmosis membrane module 802. The reverse osmosis inlet 801 is connected to the ultrafiltration outlet 603. The reverse osmosis outlet 803 is connected to the second water tank 9. The reverse osmosis membrane module 802 has extremely high desalination and retention rates, effectively removing dissolved salts, colloids, organic matter, bacteria, and other impurities from the water, resulting in higher purity effluent. The second water tank 9 has a second water tank inlet 901 at its top, which is connected to the reverse osmosis outlet 803. The second water tank outlet 902 is located at the bottom of the side wall of the second water tank.

[0050] The hydrogen production and storage system includes a hydrogen production device 10, a hydrogen compression device 11, an underground gas storage system 12, and a hydrogen purification device 13 connected in sequence; the hydrogen production device 10 is connected to a photovoltaic system 14 and a drainage water pretreatment system respectively; the hydrogen compression device 11 is connected to a coal gangue pretreatment system.

[0051] The hydrogen production equipment 10 includes a second water inlet 1001, an electrolyzer 1002, an oxygen outlet 1003, and a first hydrogen outlet 1004. The second water inlet 1001 is located on the side wall of the electrolyzer 1002. The oxygen outlet 1003 and the first hydrogen outlet 1004 are spaced apart at the top of the electrolyzer 1002. The second water inlet 1001 is connected to a drainage pretreatment system. The first hydrogen outlet 1004 is connected to a hydrogen compression device 11. The electrolyzer 1002 is connected to a photovoltaic system 14. The photovoltaic system 14 is a distributed photovoltaic power generation system installed on the ground space of an abandoned coal mine. The photovoltaic system 14 not only utilizes idle land, but also generates electricity that is self-sufficient, providing power for the entire resource utilization system. Excess electricity can be sold to the grid, increasing economic benefits.

[0052] The hydrogen compression device 11 is equipped with a hydrogen inlet 1101 and a heat recovery device 1103 on its side wall; a second hydrogen outlet 1102 is provided on the top of the hydrogen compression device 11; the hydrogen inlet 1101 is connected to the hydrogen production device 10; the second hydrogen outlet 1102 is connected to the underground gas storage system 12. The heat generated by the compressed hydrogen is recovered by the heat recovery device 1103 and used to heat the aerobic fermentation device 3.

[0053] The underground gas storage system 12 includes a gas storage tank 1203; a third air inlet 1201 and a second air outlet 1202 are respectively provided on both sides of the gas storage tank 1203 and connected thereto; the third air inlet 1201 is connected to a hydrogen compression device 11; and the second air outlet 1202 is connected to a hydrogen purification device 13. The gas storage tank 1203 mainly utilizes the structurally stable and well-sealed caverns formed by coal mining to safely and efficiently store hydrogen underground. This solves the safety problem of hydrogen storage and utilizes the space resources of abandoned coal mines. At the same time, hydrogen, as a clean energy source, can be used in heavy-duty transportation vehicles such as coal-carrying trucks, reducing carbon emissions.

[0054] The hydrogen purification device 13 has a fourth air inlet 1301 on its side wall; the hydrogen purification device 13 has a third air outlet 1302 at its bottom; the fourth air inlet 1301 is connected to the underground gas storage system 12.

[0055] The soil remediation system 15 includes improved soil 1501; giant reed 1503 is placed on top of the improved soil 1501; water distribution pipes 1502 are arranged around the bottom of the giant reed 1503; the improved soil 1501 is connected to a coal gangue pretreatment system; and the water distribution pipes 1502 are connected to a drainage water pretreatment system. The soil remediation system 15 uses soil conditioner produced by the coal gangue pretreatment system for mine soil remediation, uses water produced by the drainage water pretreatment system for soil irrigation, and simultaneously plants giant reed 1503 to improve the soil.

[0056] The second objective of this invention is to provide a method for the resource utilization of abandoned coal mines, which specifically includes the following steps:

[0057] The coal gangue is crushed by the coal gangue pretreatment equipment 1, and then modified by the coal gangue modification equipment 2; the modified coal gangue is temporarily stored in the aerobic fermentation equipment 3.

[0058] The drain water undergoes mud-water separation in the drain water pretreatment equipment 4, and the resulting sludge is discharged to the aerobic fermentation equipment 3. The drain water then enters the drain water filtration device 5 for further purification. The purified water is temporarily stored in the first water tank 7. Part of the water in the first water tank 7 is used directly as the water source for irrigation of the soil remediation system 15, and the other part enters the ultrafiltration device 6 for deep treatment. The water after deep treatment enters the reverse osmosis device 8 for further treatment and is then temporarily stored in the second water tank 9.

[0059] Water from the second water tank 9 enters the hydrogen production equipment 10 for electrolysis to produce oxygen and hydrogen. The electrical energy required for the electrolysis process comes from the photovoltaic system 14. After collection and purification, the oxygen is used for ventilation during underground mining operations. The hydrogen enters the hydrogen compression equipment 11 for compression, and the compressed hydrogen enters the underground gas storage system 12 for storage. The hydrogen stored in the underground gas storage system 12 is periodically discharged, purified by the hydrogen purification equipment 13, and then transported by tank truck for hydrogen refueling of heavy-duty trucks in the mining area.

[0060] Crushed crop straw collected from the surrounding area, kitchen waste from the mining area's living quarters, sludge from the drainage pretreatment equipment 4, and modified coal gangue are fermented in the aerobic fermentation equipment 3. The heat required during fermentation comes from the hydrogen compression device 11. The fermented and decomposed material is discharged and temporarily stored as a soil conditioner for the soil remediation system 15. The soil conditioner is added to the soil to be improved to form improved soil 1501. Giant Napier grass 1503 is planted on the improved soil 1501 for soil remediation. Water is periodically supplied from the first water tank 7 and distributed through the water distribution pipe 1502 for irrigation to ensure the water required for the growth of giant Napier grass 1503. After a certain growth cycle, the giant Napier grass 1503 is harvested, crushed, and further utilized as raw material in the aerobic fermentation equipment 3.

[0061] Specifically, coal gangue enters the coal gangue pretreatment equipment 1 from the top of the first feed hopper 105. It is first crushed by the coarse crushing roller 106, and then by the fine crushing roller 107. It is temporarily stored in the first collection hopper 108. The crushed coal gangue enters the gap structure between the upper plate 109 and the lower plate 110 through the central channel of the upper plate 109. The lifting shaft 111 drives the lower plate 110 to rotate and rise to achieve further crushing of the coal gangue. The crushed coal gangue falls from the edge of the lower plate 110 into the second collection hopper 114 for temporary storage, and is discharged from the first discharge port 115 to the second feed hopper 201. At the same time, the binder, foaming agent and water also enter from the second feed hopper 201. The material entering the mixing tank 202 is fully mixed and reacted under the stirring of the agitator 203, and is discharged from the liquid outlet pipe 204 set at the bottom of the mixing tank 202. The discharged mixed liquid is atomized by atomizer 205 and moves from top to bottom inside the equipment. Air is heated by air heater 206, and after being pressurized by booster fan 207, it enters coal gangue modification equipment 2 through first air inlet 208. Under the action of air distribution pipe 209, it is fully dispersed. As the hot air moves upward from the bottom of coal gangue modification equipment 2, it exchanges heat with the atomized liquid to form particles. The dried particles are temporarily stored in storage hopper 211 and periodically discharged from second discharge port 212 and temporarily stored in third feed hopper 301 of aerobic fermentation equipment 3. Crushed crop straw, kitchen waste from mining area living area, sludge and modified coal gangue collected from the surrounding area are crushed and mixed in third feed hopper 301 by multi-stage mixing shaft 302. The mixed materials enter the fermentation chamber 303, which rotates and ferments at a certain temperature. The oxygen required for fermentation enters through the second air inlet 304, and the heat required comes from the heat recovery device 1103 of the hydrogen compression unit 11. After a period of time, the fermented and decomposed materials are discharged through the third discharge outlet 305 as a soil conditioner in the soil remediation system 15.

[0062] Drainage water generated during coal mining enters the drainage water pretreatment equipment 4 through the first inlet 402 and is thoroughly mixed with PAC and PAM entering through the dosing port 401 under the action of the moving agitator 404. The mixed liquid overflows from the top of the partition wall 405 and is accelerated to settle under the action of the inclined plate 410, realizing mud-water separation. The settled sludge is collected in the settling hopper 406 and discharged through the sludge outlet 407. The supernatant after sedimentation overflows through overflow tank 408 and is transported through first outlet 409 to the inlet 505 at the bottom of the drain water filtration device 5. It then passes sequentially through zeolite layer 504, activated carbon layer 503, and quartz sand layer 502, removing pollutants and further purifying the water. The filtered water is discharged through second outlet 501 to the inlet 701 of the first water tank for temporary storage. Part of the water in the first water tank 7 is used directly as a water source for irrigation of the soil remediation system 15, while the other part is transported through the outlet 702 of the first water tank to the ultrafiltration inlet 601, where it enters the ultrafiltration membrane module. Water is purified by the action of component 602. The purified water is discharged from the ultrafiltration outlet 603 to the reverse osmosis inlet 801. The water is then purified by the reverse osmosis membrane module 802 and discharged from the reverse osmosis outlet 803 to the second water tank 9 for temporary storage. The water in the second water tank 9 serves as the hydrogen production source, discharging from the second water tank outlet 902 and entering the hydrogen production equipment 10 through the second inlet 1001. Electrolysis is performed in the electrolyzer 1002 to produce hydrogen and oxygen. The generated oxygen is discharged from the oxygen outlet 1003, collected, purified, and used as ventilation gas during underground mining operations. The generated hydrogen is discharged from the first hydrogen outlet 1004 for further treatment. The electrical energy required for the electrolysis process comes from the distributed photovoltaic system 14 deployed in the mining area.

[0063] Hydrogen from the hydrogen production unit 10 enters the hydrogen compression unit 11 through the hydrogen inlet 1101 to be compressed. The compressed hydrogen is discharged through the second hydrogen outlet 1102 and enters the underground gas storage system 12 through the third inlet 1201, where it is stored in the gas storage tank 1203. The stored hydrogen is periodically discharged through the second outlet 1202, purified by the hydrogen purification unit 13, and then transported by tank truck for refueling of heavy-duty trucks in the mining area.

[0064] The soil conditioner produced by the aerobic fermentation equipment 3 is used to improve the soil in the mining area. Giant Napier grass 1503 is planted on the improved soil for soil remediation. Water is regularly supplied from the first water tank 7 and distributed through the water distribution pipe 1502 for irrigation to ensure the water required for the growth of giant Napier grass 1503. After a certain growth cycle, the giant Napier grass 1503 is harvested, crushed, and used as raw material for further utilization in the aerobic fermentation equipment 3.

[0065] The coal gangue entering the first feed hopper 105 has a particle size of 5-10cm. After being crushed by the coarse crushing roller 106, the coal gangue has a particle size of 2-5cm. After being crushed by the fine crushing roller 107, the coal gangue has a particle size of 0.5-1cm. After being ground by the upper plate 109 and the lower plate 110, the coal gangue has a particle size of 0.5-1mm. The binder is cement, multi-component self-gelling powder or industrial starch. The foaming agent is aluminum powder, sodium perborate or sulfuric acid. The amount of binder added is 8%-12% of the coal gangue, and the amount of foaming agent added is 2%-5% of the coal gangue. The air heater 206 heats the air to 200-300℃. The moisture content of the mixture in fermentation chamber 303 is adjusted to between 50-60%, the C / N ratio is adjusted to between 20-35, the fermentation temperature is 50-60℃, the fermentation time is 10-12 days, and the moisture content of the fermented material is in the range of 30%-40%. The water quality in the first water tank 7 meets the "Standard for Irrigation Water Quality of Farmland GB5084-2021", and the water quality in the second water tank 9 meets the "Technical Requirements for Hydrogen Production Systems by Water Electrolysis (GB / T 19774-2005)".

[0066] This invention realizes the resource utilization of waste materials such as coal gangue and drainage water; it significantly improves the ecological environment of mining areas and promotes ecological balance. This invention proposes a new approach of "photovoltaics + multiple industries" integration, providing a demonstration case for mine restoration and resource utilization, promoting the transformation from fossil fuels to clean energy, reducing carbon emissions, and promoting green and sustainable development. The electricity production and hydrogen sales of the photovoltaic system 14 bring economic returns to the system, while also providing employment opportunities and promoting local economic development. This invention not only solves the environmental problems caused by abandoned coal mines, but also achieves efficient resource utilization and gradual ecological restoration through technological innovation, providing valuable experience and inspiration for mine restoration and resource recycling in my country and even globally.

[0067] Example 1

[0068] Coal gangue with an average particle size of 10cm enters the coal gangue pretreatment equipment 1 through the first feed hopper 105. It is then crushed to 5cm by the coarse crushing roller 106, further crushed to 1cm by the fine crushing roller 107, and finally ground to 1mm by the upper and lower grinding discs. The resulting material is discharged from the first outlet 115 and temporarily stored in the second feed hopper 201. 8% binder, 2% foaming agent, and an appropriate amount of water are added, and the mixture is thoroughly stirred in the mixing tank 202 by the agitator 203, then discharged through the outlet pipe 204. The mixture is atomized by the atomizer 205 and heat-exchanged with air heated to 200℃ by the air heater 206, forming modified particles, which are discharged through the second outlet 212. The modified particles are then thoroughly mixed with crushed straw, kitchen waste, and sludge under the action of the mixing shaft 302. The mixture has a moisture content of 50%, a C / N ratio of 20, a fermentation temperature of 50℃, and fermentation time of 12 days. After fermentation, the material has a moisture content of 30% and is temporarily stored. Drainage water from the mining process enters the drainage water pretreatment device 4 through the first inlet 402, where appropriate amounts of PAC and PAM are added and thoroughly mixed by the moving agitator 404. Overflowing from the top of the partition wall 405, the sludge is accelerated to settle under the action of the inclined plate 410, achieving mud-water separation. The settled sludge is collected in the settling hopper 406 and discharged through the sludge outlet 407 for further treatment in the aerobic fermentation device 3. The supernatant after sedimentation overflows through the overflow trough 408 and enters the drainage water filtration device 5. It then passes sequentially through the zeolite layer 504, activated carbon layer 503, and quartz sand layer 502 before entering the first water tank 7 for temporary storage. The water quality in the first water tank 7 meets the "Standard for Irrigation Water Quality GB5084-2021". A portion of the water is further purified by the ultrafiltration device 6 and the reverse osmosis device 8, and then temporarily stored in the second water tank 9. The water quality in the second water tank 9 meets the "Technical Requirements for Hydrogen Production Systems by Water Electrolysis (GB / T 19774-2005)". The water discharged from the outlet 902 of the second water tank enters the second inlet 1001 of the hydrogen production equipment 10, where hydrogen and oxygen are produced by the electrolyzer 1002. The oxygen is collected, purified, and used as ventilation gas during underground mining operations. The hydrogen is compressed by the hydrogen compression device 11 and stored in the gas storage tank 1203. Periodically, the hydrogen discharged from the second outlet 1202 is purified by the hydrogen purification device 13 to obtain hydrogen with a purity of 99.9 vol%, and then transported by tank truck for use in hydrogen-powered heavy trucks in the mining area. The soil conditioner produced by the aerobic fermentation equipment 3 is used to improve the soil in the mining area. Giant Napier grass 1503 is planted on the improved soil for soil remediation. Water is periodically supplied from the first water tank 7 and distributed through the water distribution pipe 1502 for irrigation, ensuring the water required for the growth of giant Napier grass 1503. After a certain growth cycle, the giant Napier grass 1503 is harvested, crushed, and used as raw material for further utilization in the aerobic fermentation equipment 3. Photovoltaic deployment involves installing a distributed photovoltaic power generation system in the ground space of the abandoned coal mine to form a photovoltaic system 14, providing electricity to the electrolyzer.

[0069] Example 2

[0070] Coal gangue with an average particle size of 5 cm enters the coal gangue pretreatment equipment 1 through the first feed hopper 105. It is then crushed to 2 cm by the coarse crushing roller 106, further crushed to 0.5 cm by the fine crushing roller 107, and finally ground to 0.5 mm by the upper and lower grinding discs. The resulting material is discharged from the first outlet 115 and temporarily stored in the second feed hopper 201. 12% binder, 5% foaming agent, and an appropriate amount of water are added, and the mixture is thoroughly stirred and mixed in the mixing tank 202 by the agitator 203, then discharged through the outlet pipe 204. The mixture is atomized by the atomizer 205 and heat-exchanged with air heated to 300°C by the air heater 206, forming modified particles, which are discharged through the second outlet 212. The modified particles are then thoroughly mixed with crushed straw, kitchen waste, and sludge under the action of the mixing shaft 302. The mixture has a moisture content of 60%, a C / N ratio of 35, a fermentation temperature of 60°C, and a fermentation period of 10 days. After fermentation, the material has a moisture content of 40% and is temporarily stored. Drainage water from the mining process enters the drainage water pretreatment device 4 through the first inlet 402, where appropriate amounts of PAC and PAM are added and thoroughly mixed by the moving agitator 404. Overflowing from the top of the partition wall 405, the sludge is accelerated to settle under the action of the inclined plate 410, achieving mud-water separation. The settled sludge is collected in the settling hopper 406 and discharged through the sludge outlet 407 for further treatment in the aerobic fermentation device 3. The supernatant after sedimentation overflows through the overflow trough 408 and enters the drainage water filtration device 5. It then passes sequentially through the zeolite layer 504, activated carbon layer 503, and quartz sand layer 502 before entering the first water tank 7 for temporary storage. The water quality in the first water tank 7 meets the "Standard for Irrigation Water Quality GB5084-2021". A portion of the water is further purified by the ultrafiltration device 6 and the reverse osmosis device 8, and then temporarily stored in the second water tank 9. The water quality in the second water tank 9 meets the "Technical Requirements for Hydrogen Production Systems by Water Electrolysis (GB / T 19774-2005)". The water discharged from the outlet 902 of the second water tank enters the second inlet 1001 of the hydrogen production equipment 10, where hydrogen and oxygen are produced by the electrolyzer 1002. The oxygen is collected, purified, and used as ventilation gas during underground mining operations. The hydrogen is compressed by the hydrogen compression device 11 and stored in the gas storage tank 1203. Periodically, the hydrogen discharged from the second outlet 1202 is purified by the hydrogen purification device 13 to obtain hydrogen with a purity of 99.9 vol%, and then transported by tank truck for use in hydrogen-powered heavy trucks in the mining area. The soil conditioner produced by the aerobic fermentation equipment 3 is used to improve the soil in the mining area. Giant Napier grass 1503 is planted on the improved soil for soil remediation. Water is periodically supplied from the first water tank 7 and distributed through the water distribution pipe 1502 for irrigation, ensuring the water required for the growth of giant Napier grass 1503. After a certain growth cycle, the giant Napier grass 1503 is harvested, crushed, and used as raw material for further utilization in the aerobic fermentation equipment 3. Photovoltaic deployment involves installing a distributed photovoltaic power generation system in the ground space of the abandoned coal mine to form a photovoltaic system 14, providing electricity to the electrolyzer.

[0071] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A system for the resource utilization of abandoned coal mines, characterized in that, It includes a coal gangue pretreatment system, a drainage water pretreatment system, a hydrogen production and storage system, a photovoltaic system (14), and a soil remediation system (15); the coal gangue pretreatment system is connected to the hydrogen production and storage system and the soil remediation system (15) respectively; the drainage water pretreatment system is connected to the hydrogen production and storage system and the soil remediation system (15) respectively; the photovoltaic system (14) is connected to the hydrogen production and storage system; The coal gangue pretreatment system includes a coal gangue pretreatment device (1), a coal gangue modification device (2), and an aerobic fermentation device (3) connected in sequence; the aerobic fermentation device (3) is connected to the hydrogen production and storage system and the soil remediation system (15) respectively. The drain water pretreatment system includes a drain water pretreatment device (4), a drain water filtration device (5), a first water tank (7), an ultrafiltration device (6), a reverse osmosis device (8), and a second water tank (9) connected in sequence; the first water tank (7) is connected to the soil remediation system (15); and the second water tank (9) is connected to the hydrogen production and storage system. The hydrogen production and storage system includes a hydrogen production device (10), a hydrogen compression device (11), an underground gas storage system (12), and a hydrogen purification device (13) connected in sequence; the hydrogen production device (10) is connected to a photovoltaic system (14) and a drainage water pretreatment system respectively; the hydrogen compression device (11) is connected to a coal gangue pretreatment system; The soil remediation system (15) includes improved soil (1501); giant reed grass (1503) is installed on top of the improved soil (1501); water distribution pipes (1502) are installed around the bottom of the giant reed grass (1503); the improved soil (1501) is connected to a coal gangue pretreatment system; and the water distribution pipes (1502) are connected to a drainage water pretreatment system. The coal gangue modification equipment (2) is provided with a second feed hopper (201) at the top; the coal gangue modification equipment (2) is provided with a mixing tank (202) inside; the mixing tank (202) is connected to the second feed hopper (201); the mixing tank (202) is provided with a stirrer (203) inside; the mixing tank (202) is provided with a liquid outlet pipe (204) at the bottom; the liquid outlet pipe (204) is connected to an atomizer (205); multiple air distribution pipes (209) are provided below the atomizer (205); the multiple air distribution pipes (209) are all connected to a first air inlet (208); a storage hopper (211) is provided below the air distribution pipes (209); the coal gangue modification equipment (2) is provided with a second discharge port (212) at the bottom; the second discharge port (212) is connected to the storage hopper (211) and the aerobic fermentation equipment (3) respectively.

2. The waste coal mine resource utilization system according to claim 1, characterized in that, The hydrogen production equipment (10) includes a second water inlet (1001), an electrolyzer (1002), an oxygen outlet (1003), and a first hydrogen outlet (1004); the second water inlet (1001) is disposed on the side wall of the electrolyzer (1002); the oxygen outlet (1003) and the first hydrogen outlet (1004) are disposed at intervals on the top of the electrolyzer (1002); the second water inlet (1001) is connected to a drain water pretreatment system; the first hydrogen outlet (1004) is connected to a hydrogen compression device (11); and the electrolyzer (1002) is connected to a photovoltaic system (14).

3. The waste coal mine resource utilization system according to claim 1, characterized in that, The hydrogen compression device (11) is provided with a hydrogen inlet (1101) and a heat recovery device (1103) on its side wall; a second hydrogen outlet (1102) is provided on the top of the hydrogen compression device (11); the hydrogen inlet (1101) is connected to the hydrogen production device (10); the second hydrogen outlet (1102) is connected to the underground gas storage system (12).

4. The waste coal mine resource utilization system according to claim 1, characterized in that, The underground gas storage system (12) includes a gas storage tank (1203); a third air inlet (1201) and a second air outlet (1202) are respectively provided on both sides of the gas storage tank (1203) and connected thereto; the third air inlet (1201) is connected to a hydrogen compression device (11); and the second air outlet (1202) is connected to a hydrogen purification device (13).

5. The waste coal mine resource utilization system according to claim 1, characterized in that, The hydrogen purification device (13) has a fourth air inlet (1301) on its side wall; the hydrogen purification device (13) has a third air outlet (1302) at its bottom; the fourth air inlet (1301) is connected to the underground gas storage system (12).

6. A method for the resource utilization of abandoned coal mines, characterized in that, The abandoned coal mine resource utilization system as described in any one of claims 1-5 specifically includes the following steps: Coal gangue is crushed by coal gangue pretreatment equipment (1), and the crushed coal gangue is modified by coal gangue modification equipment (2); the modified coal gangue is temporarily stored in aerobic fermentation equipment (3). The drain water is separated into mud and water by the drain water pretreatment equipment (4), and the resulting sludge is discharged to the aerobic fermentation equipment (3). The resulting drain water enters the drain water filtration device (5) for further purification. The purified water is temporarily stored in the first water tank (7). Part of the water in the first water tank (7) is directly used as the water source for irrigation of the soil remediation system (15), and the other part enters the ultrafiltration device (6) for deep treatment. The water after deep treatment enters the reverse osmosis device (8), and after further treatment, it is temporarily stored in the second water tank (9). Water from the second water tank (9) enters the hydrogen production equipment (10) for electrolysis to produce oxygen and hydrogen. The electrical energy required for the electrolysis process comes from the photovoltaic system (14). After the oxygen is collected and purified, it is used as ventilation gas in the underground mining operation. The hydrogen enters the hydrogen compression equipment (11) to compress the hydrogen. The compressed hydrogen enters the underground gas storage system (12) for storage. The hydrogen stored in the underground gas storage system (12) is periodically discharged and purified by the hydrogen purification equipment (13). It is then transported by tank truck for hydrogen refueling of heavy-duty trucks in the mining area. The crushed crop straw collected from the surrounding area, the kitchen waste from the mining area, the sludge from the drainage pretreatment equipment (4), and the modified coal gangue are fermented in the aerobic fermentation equipment (3). The heat required during the fermentation process comes from the hydrogen compression device (11). The fermented and decomposed material is discharged and temporarily stored as a soil conditioner for the soil remediation system (15). The soil conditioner is added to the soil to be improved to form improved soil (1501). Giant Napier grass (1503) is planted on the improved soil (1501) for soil remediation. Water is regularly transported from the first water tank (7) and distributed through the water distribution pipe (1502) for irrigation to ensure the water required for the growth of giant Napier grass (1503). After a certain period of growth, the giant Napier grass (1503) is harvested and crushed as raw material for further utilization in the aerobic fermentation equipment (3).

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