Aerobic-anaerobic combined pretreatment of coal gasification device and method

Abstract

The application discloses an aerobic-anaerobic bacteria combined coal pretreatment biological gas production device, which comprises a gas blowing system, a bacterial population pre-culturing system, an aerobic-anaerobic biological combined pretreatment and gas production system and a gas-liquid two-phase collection and monitoring system. The application also discloses a gas production method of the gas production device. The application takes coal as a substrate, and under suitable conditions, carries out culture and optimization of a methanogenic bacterial population, and simulates indoor biological gas production effects under different coal rank, bacterial type, combined pretreatment mode, treatment time and metabolic environment conditions. The application adopts an integrated combined processor to combine aerobic bacteria and anaerobic bacteria for pretreating coal, so that coal-based biological gas production can be safely and efficiently carried out, and the application has important environmental benefits and broad application prospect.

Description

A biogas production device and method for coal pretreatment using aerobic and anaerobic bacteria. Technical Field

[0001] This invention belongs to the field of coalbed methane bioengineering technology, specifically relating to a biogas production device and method for coal pretreatment using aerobic and anaerobic bacteria. Background Technology

[0002] Biogenic coalbed methane is a gas, primarily composed of methane, generated in coal seams by microorganisms acting on organic matter in coal at relatively low temperatures (optimal temperature 30 ℃~55 ℃). Coal is a complex mixture of macromolecular solids with polycyclic aromatic hydrocarbon structures, making it difficult for microorganisms to utilize without pretreatment. Traditional chemical and physical oxidation methods can alter the degree of oxidation or hydrophilicity of coal, improving its bioavailability. However, these physicochemical pretreatment methods may remove some minerals from the coal and are carried out under conditions of strong acid, strong alkali, high temperature, and high pressure. The introduced new chemical substances have negative effects on the environment and microbial growth, hindering subsequent gasification. Aerobic and anaerobic microbial oxidation pretreatment degrades or decomposes some organic matter in coal molecules, increasing the solubility of coal molecules in water and converting coal into water-soluble substances. This method has advantages such as high degradability, simple process, low energy consumption, and no pollution. Since biogenic gas itself is produced under the action of microorganisms, studying biogas production from coal after bio-oxidation is feasible. By exploring the biogas production effect of coal after aerobic-anaerobic bio-oxidation, we can not only increase the amount of coalbed methane resources to obtain clean energy, but also provide a new environmentally friendly technology for coal utilization. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a biogas production device and method for coal pretreatment using a combination of aerobic and anaerobic bacteria. The device combines aerobic and anaerobic bacteria to pretreat coal and produce biogas. The biogas production effect is analyzed under different coal ranks, bacterial species, combined pretreatment methods, treatment times, and metabolic environmental conditions.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a biogas production device for coal pretreatment using aerobic and anaerobic bacteria, comprising a gasification system, a microbial pre-culture system, an aerobic-anaerobic combined pretreatment and gas production system, and a gas-liquid two-phase acquisition and monitoring system.

[0005] The aeration system is used to provide oxygen to the microbial pre-culture system and the combined aerobic-anaerobic biological pretreatment and gas production system.

[0006] The microbial pre-culture system is used to supply aerobic microbial liquid, anaerobic microbial liquid, and methanogenic microbial liquid to the aerobic-anaerobic combined biological pretreatment and gas production system.

[0007] The gas-liquid two-phase acquisition and monitoring system is used to collect the gas and liquid generated by the microbial pre-culture system and the aerobic-anaerobic biological combined pretreatment and gas production system, analyze the collected gas, and monitor and control the working status of the microbial pre-culture system and the aerobic-anaerobic biological combined pretreatment and gas production system in real time.

[0008] The combined anaerobic biological pretreatment and gasification system includes a combined treatment tank, a first insulation layer, a closed cover, a stirring motor, a stirring shaft, and stirring blades. The first insulation layer is located on the outer wall of the combined treatment tank, and a heating wire and a first temperature controller are installed inside the first insulation layer. The closed cover is located on the top of the combined treatment tank, and the stirring motor is located on the closed cover. A support frame for supporting the stirring motor is located inside the closed cover. The main shaft of the stirring motor is vertically downward, and the upper end of the stirring shaft is coaxially connected to the main shaft of the stirring motor through a coupling. The stirring blades are located on the stirring shaft. A waste liquid discharge pipe is located at the bottom of the combined treatment tank, and a main liquid inlet pipe is located on the upper left side of the combined treatment tank.

[0009] The microbial pre-culture system includes an aerobic pre-culture tank, an anaerobic pre-culture tank, a methanogenic pre-culture tank, a second insulation layer, a third insulation layer, a fourth insulation layer, a second temperature controller, a third temperature controller, a fourth temperature controller, a first inlet pipe, a second inlet pipe, and a third inlet pipe;

[0010] The aerobic pre-culture tank has an open top, while the anaerobic pre-culture tank and the methanogenic pre-culture tank each have a lid. A second insulation layer is installed on the outer wall of the aerobic pre-culture tank, a third insulation layer is installed on the outer wall of the anaerobic pre-culture tank, and a fourth insulation layer is installed on the outer wall of the methanogenic pre-culture tank. Heating wires are installed inside the second, third, and fourth insulation layers. A second temperature controller is installed inside the second insulation layer, a third temperature controller is installed inside the third insulation layer, and a fourth temperature controller is installed inside the fourth insulation layer. The inlet ports of the first, second, and third inlet pipes extend into the aerobic pre-culture tank, the anaerobic pre-culture tank, and the methanogenic pre-culture tank, respectively. The outlet ports of the first, second, and third inlet pipes are all connected to the inlet port of the main inlet pipe.

[0011] The aeration system includes an oxygen source, a gas electromagnetic flow meter, a first aeration pipe, and a second aeration pipe. The outlet of the oxygen source is connected to the main aeration pipe. The outlet of the first aeration pipe extends into the combined treatment tank, and the outlet of the second aeration pipe extends into the aerobic bacteria pre-culture tank. The inlets of both the first and second aeration pipes are connected to the outlet of the main aeration pipe. The gas electromagnetic flow meter is installed on the main aeration pipe.

[0012] The gas-liquid two-phase acquisition and monitoring system includes a first liquid intake pipe, a second liquid intake pipe, a third liquid intake pipe, a fourth liquid intake pipe, a gas intake pipe, a first gas pressure sensor, a dryer, a gas flow meter, a pumping power pump, a first liquid flow meter, a second liquid flow meter, a third liquid flow meter, a first exhaust pipe, a second exhaust pipe, a second gas pressure sensor, a third gas pressure sensor, a gas analyzer, and a PLC controller.

[0013] The first liquid sampling pipe is located on the lower right side of the combined treatment tank; the second liquid sampling pipe is located on the lower side of the aerobic bacteria pre-culture tank; the third liquid sampling pipe is located on the lower side of the anaerobic bacteria pre-culture tank; the fourth liquid sampling pipe is located on the lower side of the methanogenic bacteria pre-culture tank; the gas sampling pipe is located on the upper right side of the combined treatment tank; the first gas pressure sensor is installed on the gas sampling pipe and located inside the combined treatment tank; the dryer and gas flow meter are installed on the gas sampling pipe and located outside the combined treatment tank; the first liquid flow meter, the second liquid flow meter, and the third liquid flow meter are respectively installed on the first, second, and third inlet pipes; the first exhaust pipe is located on the upper side of the anaerobic bacteria pre-culture tank; the second exhaust pipe is located on the upper side of the methanogenic bacteria pre-culture tank; the second... A gas pressure sensor is installed on the first exhaust pipe and located inside the anaerobic bacteria pre-culture tank. A third gas pressure sensor is installed on the second exhaust pipe and located inside the methanogenic bacteria pre-culture tank. The outlet of the gas intake pipe is connected to the gas analyzer. The suction port of the vacuum pump is connected to the gas intake pipe, the first exhaust pipe, and the second exhaust pipe through the suction pipe. The PLC controller is connected to the stirring motor, the first temperature controller, the second temperature controller, the third temperature controller, the first liquid flow meter, the second liquid flow meter, the third liquid flow meter, the vacuum pump, the first gas pressure sensor, the second gas pressure sensor, the third gas pressure sensor, the gas flow meter, and the gas analyzer through control cables.

[0014] A biogas production method for a coal pretreatment device using aerobic and anaerobic bacteria includes the following steps:

[0015] (1) Assemble and connect the aeration system, microbial pre-culture system, aerobic-anaerobic biological combined pretreatment and gas production system and gas-liquid two-phase acquisition and monitoring system, and seal the joints of the insulation layer with elastic foam pads or silicate composite thermal insulation coating.

[0016] (2) Add nutrients and corresponding bacterial strains to the aerobic bacteria pre-culture tank, anaerobic bacteria pre-culture tank, and methanogenic bacteria pre-culture tank respectively to pre-enrich the bacterial community; turn on the oxygen source and continuously blow oxygen into the aerobic bacteria pre-culture tank; turn on the vacuum pump to make the anaerobic bacteria pre-culture tank and the methanogenic bacteria pre-culture tank an anaerobic environment; by controlling the second temperature controller, the third temperature controller and the fourth temperature controller, the heating wire works to control the temperature in the aerobic bacteria pre-culture tank, the anaerobic bacteria pre-culture tank and the methanogenic bacteria pre-culture tank within the suitable temperature range for the growth of their respective bacterial communities;

[0017] (3) After the microbial community has been enriched for a certain period of time, open the valves on the second, third and fourth liquid collection tubes, take an appropriate amount of liquid to measure the microbial community enrichment parameters; biogas will be generated during the anaerobic microbial community enrichment process. When a certain pressure is reached, the second and third gas pressure sensors will issue an alarm and release the gas in time through the first and second exhaust pipes.

[0018] (4) Add a certain amount of coal into the combined treatment tank, open the valve of the first inlet pipe to allow the aerobic bacterial liquid to flow into the combined treatment tank, and record the flow rate with the first liquid flow meter; open the valve on the first blast pipe to continuously blast oxygen into the combined treatment tank; start the stirring motor and drive the stirring blades through the stirring shaft to continuously stir the bacterial liquid; after a period of time during aerobic biological oxidation, open the valve of the first sampling pipe, take an appropriate amount of reaction liquid to determine the bacterial activity and metabolic environment changes of the bacterial liquid in the reaction system;

[0019] (5) Close the closed cover, turn on the suction power pump, and evacuate the combined treatment tank through the gas intake pipe to make the combined treatment tank an anaerobic environment; open the valve of the second inlet pipe to allow the anaerobic bacterial liquid to flow into the combined treatment tank, and record the flow rate with the second liquid flow meter; after the anaerobic biological oxidation of coal for a period of time, open the valve of the first liquid intake pipe, take an appropriate amount of reaction liquid to measure the bacterial activity and changes in the bacterial liquid of the reaction system's metabolic environment; biogas will be generated during the anaerobic bacterial oxidation of coal, and when a certain pressure is reached, the first gas pressure sensor will issue an alarm so that the gas can be discharged in time through the gas intake pipe;

[0020] (6) Open the valve on the third inlet pipe to allow the methanogenic bacteria liquid to flow into the combined treatment tank, and record the flow rate with the third liquid flow meter; after the methanogenic bacteria have reduced the coal for a period of time, open the valve on the first liquid sampling pipe, take an appropriate amount of reaction liquid to determine the bacterial activity and changes in the bacterial liquid of the reaction system's metabolic environment.

[0021] (7) Coal in the joint processing tank will produce biogas under the action of methanogenic bacteria. The gas is discharged through the gas intake pipe. First, it is dried by a dryer. Then, the gas flow data, including instantaneous gas flow and cumulative gas flow, is recorded by a gas flow meter. Finally, the gas analyzer automatically records the gas composition data, including changes in the concentration of gases such as methane, carbon dioxide, and nitrogen.

[0022] (8) After the aerobic-anaerobic pretreatment coal biogas production experiment is completed, open the waste liquid discharge pipe to drain the residual liquid; follow the above steps to conduct other combined pretreatment coal biogas production experiments, and compare the biogas production effects under different coal ranks, bacterial species, combined pretreatment methods, treatment time and metabolic environment conditions.

[0023] Some structural details of this invention are as follows: the insulation material for the combined treatment tank, aerobic pre-culture tank, anaerobic pre-culture tank, and methanogenic pre-culture tank can be aluminum silicate insulation board, and the seams and joints of the insulation layer can be sealed with elastic foam pads or silicate composite insulation coating. The required growth temperature for the aerobic-anaerobic bacteria in the combined treatment tank can be set by operating the first temperature controller. The closed lid of the combined treatment tank can be opened or closed according to the aerobic-anaerobic conditions of the aerobic-anaerobic bacteria. The gas pressure sensors installed at the inner ports of the gas intake pipe, the first exhaust pipe, and the second exhaust pipe are high-precision sensors; when the gas pressure exceeds 1.1 × 10⁻⁶... 5 An alarm signal will be issued when the pressure reaches a certain level (Pa). Electric valves are installed on the intake pipe, the first exhaust pipe, and the second exhaust pipe, and these valves are connected to the PLC controller. The dryer can be filled with anhydrous calcium chloride (CaCl2) or anhydrous sodium sulfate (Na2SO4).

[0024] By adopting the above technical solution, the present invention has the following beneficial effects:

[0025] 1. The aeration system can continuously supply oxygen to the combined treatment tank and the aerobic bacteria pre-culture tank.

[0026] 2. The aerobic bacteria pre-culture tank, anaerobic bacteria pre-culture tank, and methanogenic bacteria pre-culture tank can be used for pre-culture according to the required growth conditions of the biological strains. The closed lid can be opened according to the aerobic and anaerobic characteristics of the biological community in the combined treatment tank. The stirring blades fixed on the stirring shaft can fully stir the solid and liquid inside the combined treatment tank.

[0027] 3. The gas-liquid two-phase acquisition and monitoring system can collect the generated gas and liquid and perform gas analysis.

[0028] 4. This invention uses coal as a substrate and cultivates and optimizes methanogenic bacteria under suitable conditions. The biogas production effect is simulated indoors under different coal ranks, bacterial species, combined pretreatment methods, treatment times, and metabolic environmental conditions. By collecting liquid samples during aerobic and anaerobic pretreatment and methanogenesis by methanogens, the characteristics of the liquid phase, bacterial activity, and microbial species are analyzed to obtain the changes in various indicators during the biological oxidation-reduction process. The changes in coal structure during aerobic and anaerobic biological treatment and methanogen degradation are analyzed. Instantaneous and cumulative gas flow rates during biogas production are monitored and analyzed, and the concentrations of gas components such as methane, carbon dioxide, and nitrogen are measured to further explore the biogas production effect of coal pretreated with aerobic and anaerobic bacteria.

[0029] In summary, the device of the present invention has a compact structure, is easy to operate, and has low cost. It adopts an integrated combined treatment tank to pretreat coal with aerobic and anaerobic bacteria, enabling safe and efficient coal-to-biogas production. It has significant environmental benefits and broad application prospects, high practical performance, and important scientific research value and practical significance. Attached Figure Description

[0030] Figure 1 is a schematic diagram of the structure of the present invention. Detailed Implementation

[0031] As shown in Figure 1, the biogas production device for coal pretreatment using aerobic and anaerobic bacteria according to the present invention includes a gasification system, a microbial pre-culture system, a combined aerobic-anaerobic biological pretreatment and gas production system, and a gas-liquid two-phase acquisition and monitoring system.

[0032] The aeration system is used to provide oxygen to the microbial pre-culture system and the combined aerobic-anaerobic biological pretreatment and gas production system.

[0033] The microbial pre-culture system is used to supply aerobic microbial liquid, anaerobic microbial liquid, and methanogenic microbial liquid to the aerobic-anaerobic combined biological pretreatment and gas production system.

[0034] The gas-liquid two-phase acquisition and monitoring system is used to collect the gas and liquid generated by the microbial pre-culture system and the aerobic-anaerobic biological combined pretreatment and gas production system, analyze the collected gas, and monitor and control the working status of the microbial pre-culture system and the aerobic-anaerobic biological combined pretreatment and gas production system in real time.

[0035] The combined anaerobic biological pretreatment and gasification system includes a combined treatment tank 1, a first insulation layer 2, a closing cover 4, a stirring motor 5, a stirring shaft 7, and stirring blades 8. The first insulation layer 2 is located on the outer wall of the combined treatment tank 1. A heating wire and a first temperature controller 3 are installed inside the first insulation layer 2. The closing cover 4 is located on the top of the combined treatment tank 1. The stirring motor 5 is located on the closing cover 4. A support frame 6 for supporting the stirring motor 5 is provided inside the closing cover 4. The main shaft of the stirring motor 5 is vertically downward. The upper end of the stirring shaft 7 is coaxially connected to the main shaft of the stirring motor 5 through a coupling. The stirring blades 8 are located on the stirring shaft 7. A waste liquid discharge pipe 10 is provided at the bottom of the combined treatment tank 1. A main liquid inlet pipe 11 is provided on the upper left side of the combined treatment tank 1.

[0036] The microbial pre-culture system includes an aerobic pre-culture tank 21, an anaerobic pre-culture tank 22, a methanogenic pre-culture tank 23, a second insulation layer 24, a third insulation layer 25, a fourth insulation layer 26, a second temperature controller 27, a third temperature controller 28, a fourth temperature controller 29, a first inlet pipe 36, a second inlet pipe 37, and a third inlet pipe 38;

[0037] The aerobic bacteria pre-culture tank 21 has an open top, while the anaerobic bacteria pre-culture tank 22 and the methanogenic bacteria pre-culture tank 23 both have lids. A second insulation layer 24 is installed on the outer wall of the aerobic bacteria pre-culture tank 21, a third insulation layer 25 is installed on the outer wall of the anaerobic bacteria pre-culture tank 22, and a fourth insulation layer 26 is installed on the outer wall of the methanogenic bacteria pre-culture tank 23. Heating wires are installed inside the second insulation layer 24, the third insulation layer 25, and the fourth insulation layer 26. A second temperature controller is installed inside the second insulation layer 24. The device 27 has a third temperature controller 28 inside the third insulation layer 25 and a fourth temperature controller 29 inside the fourth insulation layer 26. The inlet ports of the first inlet pipe 36, the second inlet pipe 37 and the third inlet pipe 38 extend into the aerobic bacteria pre-culture tank 21, the anaerobic bacteria pre-culture tank 22 and the methanogenic bacteria pre-culture tank 23, respectively. The outlet ports of the first inlet pipe 36, the second inlet pipe 37 and the third inlet pipe 38 are all connected to the inlet port of the main inlet pipe 11.

[0038] The aeration system includes an oxygen source 13, a gas electromagnetic flow meter 14, a first aeration pipe 12, and a second aeration pipe 39. The outlet of the oxygen source 13 is connected to the main aeration pipe. The outlet of the first aeration pipe 12 extends into the combined treatment tank 1, and the outlet of the second aeration pipe 39 extends into the aerobic bacteria pre-culture tank 21. The inlets of the first aeration pipe 12 and the second aeration pipe 39 are both connected to the outlet of the main aeration pipe. The gas electromagnetic flow meter 14 is installed on the main aeration pipe.

[0039] The gas-liquid two-phase acquisition and monitoring system includes a first liquid sampling pipe 9, a second liquid sampling pipe 30, a third liquid sampling pipe 31, a fourth liquid sampling pipe 32, a gas sampling pipe 16, a first gas pressure sensor 15, a dryer 17, a gas flow meter 18, a vacuum pump 19, a first liquid flow meter 33, a second liquid flow meter 34, a third liquid flow meter 35, a first exhaust pipe 40, a second exhaust pipe 41, a second gas pressure sensor 42, a third gas pressure sensor 43, a gas analyzer 20, and a PLC controller 44.

[0040] The first liquid intake pipe 9 is located on the lower right side of the combined treatment tank 1; the second liquid intake pipe 30 is located on the lower side of the aerobic pre-culture tank 21; the third liquid intake pipe 31 is located on the lower side of the anaerobic pre-culture tank 22; the fourth liquid intake pipe 32 is located on the lower side of the methanogenic pre-culture tank 23; the gas intake pipe 16 is located on the upper right side of the combined treatment tank 1; the first gas pressure sensor 15 is installed on the gas intake pipe 16 and located inside the combined treatment tank 1; the dryer 17 and the gas flow meter 18 are installed on the gas intake pipe 16 and located outside the combined treatment tank 1; the first liquid flow meter 33, the second liquid flow meter 34, and the third liquid flow meter 35 are respectively installed on the first inlet pipe 36, the second inlet pipe 37, and the third inlet pipe 38; the first exhaust pipe 40 is located on the upper side of the anaerobic pre-culture tank 22; and the second exhaust pipe 41 is located on the upper side of the methanogenic pre-culture tank 23. The second gas pressure sensor is installed on the first exhaust pipe 40 and located inside the anaerobic bacteria pre-culture tank 22. The third gas pressure sensor is installed on the second exhaust pipe 41 and located inside the methanogenic bacteria pre-culture tank 23. The outlet of the gas intake pipe 16 is connected to the gas analyzer 20. The suction port of the vacuum pump 19 is connected to the gas intake pipe 16, the first exhaust pipe 40 and the second exhaust pipe 41 through the suction pipe. The PLC controller 44 is connected to the stirring motor 5, the first temperature controller 3, the second temperature controller 27, the third temperature controller 28, the first liquid flow meter 33, the second liquid flow meter 34, the third liquid flow meter 35, the vacuum pump 19, the first gas pressure sensor, the second gas pressure sensor 42, the third gas pressure sensor 43, the gas flow meter 18 and the gas analyzer 20 through control cables.

[0041] A biogas production method for a coal pretreatment device using aerobic and anaerobic bacteria includes the following steps:

[0042] (1) Assemble and connect the aeration system, microbial pre-culture system, aerobic-anaerobic biological combined pretreatment and gas production system and gas-liquid two-phase acquisition and monitoring system, and seal the joints of the insulation layer with elastic foam pads or silicate composite thermal insulation coating.

[0043] (2) Add nutrients and corresponding bacterial strains to aerobic pre-culture tank 21, anaerobic pre-culture tank 22, and methanogenic pre-culture tank 23 respectively to pre-enrich the bacterial community; turn on oxygen source 13 and continuously blow oxygen into aerobic pre-culture tank 21; turn on vacuum pump 19 to make anaerobic environment in anaerobic pre-culture tank 22 and methanogenic pre-culture tank 23; operate heating wires by controlling second temperature controller 27, third temperature controller 28 and fourth temperature controller 29 to control the temperature in aerobic pre-culture tank 21, anaerobic pre-culture tank 22 and methanogenic pre-culture tank 23 within the suitable temperature range for the growth of their respective bacterial communities;

[0044] (3) After the microbial community has been enriched for a certain period of time, open the valves on the second liquid collection tube 30, the third liquid collection tube 31 and the fourth liquid collection tube 32, take an appropriate amount of liquid to measure the microbial community enrichment parameters; biogas will be generated during the anaerobic microbial community enrichment process. When a certain pressure is reached, the second gas pressure sensor and the third gas pressure sensor will issue an alarm and release the gas in time through the first exhaust pipe 40 and the second exhaust pipe 41.

[0045] (4) Add a certain amount of coal into the combined treatment tank 1, open the valve of the first inlet pipe 36 to allow the aerobic bacterial liquid to flow into the combined treatment tank 1, and record the flow rate with the first liquid flow meter 33; open the valve on the first blast pipe 12 to continuously blast oxygen into the combined treatment tank 1; start the stirring motor 5 and drive the stirring blades through the stirring shaft 7 to continuously stir the bacterial liquid; after a period of time during aerobic biological oxidation, open the valve of the first liquid sampling pipe 9, take an appropriate amount of reaction liquid to determine the bacterial activity and metabolic environment changes of the bacterial liquid in the reaction system;

[0046] (5) Close the cover 4, turn on the suction power pump 19, and evacuate the combined treatment tank 1 through the gas intake pipe 16 to make the combined treatment tank 1 an anaerobic environment; open the valve of the second inlet pipe 37 to allow the anaerobic bacterial liquid to flow into the combined treatment tank 1, and the second liquid flow meter 34 records the flow rate; after the anaerobic biological oxidation of coal for a period of time, open the valve of the first liquid intake pipe 9, take an appropriate amount of reaction liquid to measure the bacterial activity and changes in the bacterial liquid of the reaction system's metabolic environment; biogas will be generated during the anaerobic bacterial oxidation of coal, and when a certain pressure is reached, the first gas pressure sensor 15 will issue an alarm so that the gas can be discharged in time through the gas intake pipe 16;

[0047] (6) Open the valve on the third inlet pipe 38 to allow the methanogenic bacteria liquid to flow into the combined treatment tank 1, and record the flow rate with the third liquid flow meter 35; after the methanogenic bacteria have reduced the coal for a period of time, open the valve on the first liquid sampling pipe 9, take an appropriate amount of reaction liquid to determine the bacterial activity and changes in the bacterial liquid of the reaction system's metabolic environment.

[0048] (7) Coal in the combined treatment tank 1 will produce biogas under the action of methanogenic bacteria. The gas is discharged through the gas intake pipe 16. First, it is dried by the dryer 17. Then, the gas flow data, including instantaneous gas flow and cumulative gas flow, is recorded by the gas flow meter 18. Finally, the gas is analyzed by the gas analyzer 20. The gas analyzer 20 automatically records the gas composition data, including the changes in the concentration of gases such as methane, carbon dioxide, and nitrogen.

[0049] (8) After the aerobic-anaerobic pretreatment coal biogas production experiment is completed, open the waste liquid discharge pipe 10 to drain the residual liquid; follow the above steps to carry out other combined pretreatment coal biogas production experiments, and compare the biogas production effects under different coal ranks, bacterial species, combined pretreatment methods, treatment time and metabolic environment conditions.

[0050] Some structural details of this invention are as follows: the insulation material of the combined treatment tank 1, the aerobic bacteria pre-culture tank 21, the anaerobic bacteria pre-culture tank 22, and the methanogenic bacteria pre-culture tank 23 can be aluminum silicate insulation board, and the seams and joints of the insulation layer can be sealed with elastic foam pads or silicate composite insulation coating. The required growth temperature of the aerobic-anaerobic bacteria in the combined treatment tank 1 can be set by operating the first temperature controller 3. The closed lid 4 of the combined treatment tank 1 can be opened or closed according to the aerobic-anaerobic conditions of the aerobic-anaerobic bacteria. The gas pressure sensors installed at the inner ports of the gas intake pipe 16, the first exhaust pipe 40, and the second exhaust pipe 41 are high-precision sensors; when the gas pressure exceeds 1.1 × 10⁻⁶... 5 An alarm signal will be issued when the pressure reaches a certain level (Pa). Electric valves are installed on the intake pipe 16, the first exhaust pipe 40, and the second exhaust pipe 41, and these electric valves are connected to the PLC controller 44. The dryer 17 can be filled with anhydrous calcium chloride (CaCl2) or anhydrous sodium sulfate (Na2SO4).

[0051] This embodiment does not impose any limitation on the shape, material, structure, etc. of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A biogas production device for coal pretreatment using a combination of aerobic and anaerobic bacteria, characterized in that: It includes an aeration system, a microbial pre-culture system, a combined aerobic-anaerobic biological pretreatment and gas production system, and a gas-liquid two-phase acquisition and monitoring system. The aeration system is used to provide oxygen to the microbial pre-culture system and the combined aerobic-anaerobic biological pretreatment and gas production system. The microbial pre-culture system is used to supply aerobic microbial liquid, anaerobic microbial liquid, and methanogenic microbial liquid to the aerobic-anaerobic combined pretreatment and gas production system; the gas-liquid two-phase acquisition and monitoring system is used to collect the gas and liquid generated by the microbial pre-culture system and the aerobic-anaerobic combined pretreatment and gas production system, analyze the collected gas, and monitor and control the working status of the microbial pre-culture system and the aerobic-anaerobic combined pretreatment and gas production system in real time; the aerobic-anaerobic combined pretreatment and gas production system includes a combined treatment tank, a first insulation layer, and a closed lid. The tank consists of a stirring motor, stirring shaft, and stirring blades. A first insulation layer is installed on the outer wall of the combined treatment tank. Heating wires and a first temperature controller are installed inside the first insulation layer. A closed cover is located on the top of the combined treatment tank. The stirring motor is mounted on the closed cover, which contains a support frame. The main shaft of the stirring motor faces vertically downwards. The upper end of the stirring shaft is coaxially connected to the main shaft of the stirring motor via a coupling. The stirring blades are mounted on the stirring shaft. A waste liquid discharge pipe is located at the bottom of the combined treatment tank, and a main inlet pipe is located on the upper left side of the combined treatment tank. (The last sentence appears to be unrelated and possibly a fragment: "microbial pre-...") The culture system includes an aerobic pre-culture tank, an anaerobic pre-culture tank, a methanogenic pre-culture tank, a second insulation layer, a third insulation layer, a fourth insulation layer, a second temperature controller, a third temperature controller, a fourth temperature controller, a first inlet pipe, a second inlet pipe, and a third inlet pipe. The aerobic pre-culture tank has an open top, while the anaerobic and methanogenic pre-culture tanks are equipped with lids. The second insulation layer is located on the outer wall of the aerobic pre-culture tank, the third insulation layer is located on the outer wall of the anaerobic pre-culture tank, and the fourth insulation layer is located on the outer wall of the methanogenic pre-culture tank. Heating wires are installed inside the outer wall of the pre-culture tank, the second insulation layer, the third insulation layer, and the fourth insulation layer. A second temperature controller is installed inside the second insulation layer, a third temperature controller is installed inside the third insulation layer, and a fourth temperature controller is installed inside the fourth insulation layer. The inlet ports of the first, second, and third inlet pipes extend into the aerobic pre-culture tank, the anaerobic pre-culture tank, and the methanogenic pre-culture tank, respectively. The outlet ports of the first, second, and third inlet pipes are all connected to the inlet port of the main inlet pipe.

2. The biogas production device for coal pretreatment using aerobic and anaerobic bacteria as described in claim 1, characterized in that: The aeration system includes an oxygen source, a gas electromagnetic flow meter, a first aeration pipe, and a second aeration pipe. The outlet of the oxygen source is connected to the main aeration pipe. The outlet of the first aeration pipe extends into the combined treatment tank, and the outlet of the second aeration pipe extends into the aerobic bacteria pre-culture tank. The inlets of both the first and second aeration pipes are connected to the outlet of the main aeration pipe. The gas electromagnetic flow meter is installed on the main aeration pipe.

3. The biogas production device for coal pretreatment using aerobic and anaerobic bacteria as described in claim 2, characterized in that: The gas-liquid two-phase acquisition and monitoring system includes a first liquid sampling pipe, a second liquid sampling pipe, a third liquid sampling pipe, a fourth liquid sampling pipe, a gas sampling pipe, a first gas pressure sensor, a dryer, a gas flow meter, a vacuum pump, a first liquid flow meter, a second liquid flow meter, a third liquid flow meter, a first exhaust pipe, a second exhaust pipe, a second gas pressure sensor, a third gas pressure sensor, a gas analyzer, and a PLC controller. The first liquid sampling pipe is located on the lower right side of the combined treatment tank, the second liquid sampling pipe is located on the lower side of the aerobic bacteria pre-culture tank, the third liquid sampling pipe is located on the lower side of the anaerobic bacteria pre-culture tank, the fourth liquid sampling pipe is located on the lower side of the methanogenic bacteria pre-culture tank, and the gas sampling pipe is located on the upper right side of the combined treatment tank. The first gas pressure sensor is installed on the gas sampling pipe and located inside the combined treatment tank. The dryer and the gas flow meter are installed on the gas sampling pipe and located outside the combined treatment tank. The first liquid flow meter, the second liquid flow meter, and the third liquid flow meter... Flow meters are installed on the first, second, and third inlet pipes, respectively. The first exhaust pipe is located on the upper side of the anaerobic pre-culture tank, and the second exhaust pipe is located on the upper side of the methanogenic pre-culture tank. The second gas pressure sensor is installed on the first exhaust pipe and located inside the anaerobic pre-culture tank, and the third gas pressure sensor is installed on the second exhaust pipe and located inside the methanogenic pre-culture tank. The outlet of the gas intake pipe is connected to the gas analyzer. The suction port of the vacuum pump is connected to the gas intake pipe, the first exhaust pipe, and the second exhaust pipe through the suction pipe. The PLC controller is connected to the stirring motor, the first temperature controller, the second temperature controller, the third temperature controller, the first liquid flow meter, the second liquid flow meter, the third liquid flow meter, the vacuum pump, the first gas pressure sensor, the second gas pressure sensor, the third gas pressure sensor, the gas flow meter, and the gas analyzer through control cables.

4. A biogas production method using a biogas production device for coal pretreatment with aerobic and anaerobic bacteria as described in claim 3, characterized in that: Includes the following steps: (1) Assemble and connect the aeration system, the microbial pre-culture system, the aerobic-anaerobic biological combined pretreatment and gas production system, and the gas-liquid two-phase acquisition and monitoring system. Seal the joints of the insulation layer with elastic foam pads or silicate composite thermal insulation coatings. (2) Add nutrients and corresponding strains to the aerobic bacteria pre-culture tank, the anaerobic bacteria pre-culture tank, and the methanogenic bacteria pre-culture tank to pre-enrich the microbial community. Turn on the oxygen source and continuously pump oxygen into the aerobic bacteria pre-culture tank; turn on the suction power pump to make the anaerobic bacteria pre-culture tank and the methanogenic bacteria pre-culture tank an anaerobic environment; by controlling the second temperature controller, the third temperature controller and the fourth temperature controller, the heating wire works to control the temperature in the aerobic bacteria pre-culture tank, the anaerobic bacteria pre-culture tank and the methanogenic bacteria pre-culture tank within the appropriate temperature range for the growth of their respective bacterial communities; (3) After the bacterial community has been enriched for a certain period of time, open the valves on the second liquid sampling tube, the third liquid sampling tube and the fourth liquid sampling tube, take an appropriate amount of liquid to measure the biological community enrichment parameters; biogas will be generated during the anaerobic bacterial community enrichment process, and when a certain pressure is reached, the second gas pressure sensor and the third gas pressure sensor will issue an alarm. , through the first exhaust pipe and the second exhaust pipe to discharge the gas in time; (4) add a certain amount of coal into the combined treatment tank, open the valve of the first inlet pipe to allow the aerobic bacterial liquid to flow into the combined treatment tank, and record the flow rate with the first liquid flow meter; open the valve on the first blast pipe to continuously blow oxygen into the combined treatment tank; start the stirring motor and drive the stirring blades to continuously stir the bacterial liquid through the stirring shaft; after a period of time, open the valve of the first liquid sampling pipe, take an appropriate amount of reaction liquid to determine the bacterial activity and metabolic environment of the reaction system; (5) close the closed cover, turn on the suction power pump, and evacuate the combined treatment tank through the gas sampling pipe to make the combined treatment tank an anaerobic environment; open The valve on the second inlet pipe allows the anaerobic bacterial liquid to flow into the combined treatment tank, and the second liquid flow meter records the flow rate. After the anaerobic bio-oxidation of coal for a period of time, the valve on the first liquid sampling pipe is opened, and an appropriate amount of reaction liquid is taken to measure the bacterial activity and metabolic environment changes of the reaction system. Biogas will be generated during the anaerobic bio-oxidation of coal. When a certain pressure is reached, the first gas pressure sensor will issue an alarm so that the gas can be discharged in time through the gas sampling pipe. (6) The valve on the third inlet pipe is opened, allowing the methanogenic bacterial liquid to flow into the combined treatment tank, and the third liquid flow meter records the flow rate. After the methanogenic bacterial bio-reduction of coal for a period of time, the valve on the first liquid sampling pipe is opened, and an appropriate amount of reaction liquid is taken to measure the bacterial activity of the reaction system. Changes in the activity and metabolic environment of the bacterial solution; (7) Under the action of methanogenic bacteria, the coal in the combined treatment tank will produce biogas. The gas is discharged through the gas extraction pipe. First, it is dried by the dryer. Then, the gas flow rate data, including the instantaneous gas flow rate and the cumulative gas flow rate, is recorded by the gas flow meter. Finally, the gas analyzer automatically records the gas composition data, including the changes in the concentration of gases such as methane, carbon dioxide, and nitrogen; (8) After the aerobic-anaerobic pretreatment coal biogas production experiment is completed, the waste liquid discharge pipe is opened to drain the residual liquid; Follow the above steps to conduct other combined pretreatment coal biogas production experiments and compare the biogas production effects under different coal ranks, bacterial species, combined pretreatment methods, treatment time, and metabolic environment conditions.

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