A landfill gas extraction and post-processing device for a landfill

Abstract

The present invention belongs to the technical field of landfill gas separation and treatment equipment, and in particular, relates to a landfill gas extraction and post-processing device for a garbage landfill, comprising a treatment box, the inner wall of which is fixedly connected with a partition, and the internal cavity of the treatment box is divided into a neutralization zone and a decontamination zone by the partition. The present invention enables the landfill gas extraction and post-processing device to have the landfill gas pre-treatment capability, and can automatically adjust the efficiency of pre-treatment separation according to the input amount of landfill gas during the pre-treatment process, and the landfill gas extraction and post-processing device also has the functions of multiple separation and purification of landfill gas, increasing the reaction temperature of the sodium hydroxide alkali liquid layer and automatic replacement of the sodium hydroxide alkali liquid layer, and can increase the methane content of the landfill gas after treatment, further improve the convenience and efficiency of methane recovery and reuse in the landfill gas, and can effectively improve the use effect and reliability of the landfill gas extraction and post-processing device.

Description

Technical Field

[0001] The invention belongs to the technical field of landfill gas separation and processing equipment, and in particular relates to a landfill gas extraction and post-processing device for a garbage landfill. Background Art

[0002] Landfills are places where urban domestic waste is disposed of in a centralized manner. Landfill gas is a mixed gas produced by the decomposition of garbage by microorganisms in landfills, and its main components are methane and carbon dioxide. Extracting landfill gas is necessary. On the one hand, it can reduce the risk of explosion, prevent fire, reduce greenhouse gas emissions and harmful gas pollution of the air, and on the other hand, it can recycle energy. Extracting and post-processing landfill gas is to remove flammable and explosive components and harmful gases, ensure safety and protect the environment. For example, the patent authorization announcement number is CN219231772U, which discloses a landfill gas extraction and post-processing device for landfills.

[0003] The main components of landfill gas generated by landfills are water, micro impurities, methane, carbon dioxide, hydrogen sulfide, etc., while the initial treatment process after the landfill gas is extracted from existing landfills is relatively simple, usually only separating the water and micro impurities in the landfill gas, resulting in ineffective separation of carbon dioxide and hydrogen sulfide in the landfill gas. Gases such as carbon dioxide and hydrogen sulfide will occupy a part of the total volume of the landfill gas, and because the total volume of the gas is fixed, the high content of the two will compress the methane ratio, resulting in a low concentration of methane in the mixed gas, making the subsequent separation of methane and recycling of the landfill gas inefficient, and also having an adverse effect on the use effect and reliability of the post-treatment device for the landfill gas extracted from the landfill;

[0004] In addition, if the hydrogen sulfide in the landfill gas is not treated in time, as the landfill gas treatment device is used for a longer time, the metal parts in the device that are in direct contact with the landfill gas will react chemically with the hydrogen sulfide and produce sulfides. These sulfides will further accelerate the corrosion of the metal, easily reduce the strength and sealing of the pipeline, and easily cause pipeline leakage, thereby affecting the safety and reliability of the use of the landfill gas treatment device.

[0005] Therefore, we propose a landfill gas extraction and post-processing device for a landfill to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a landfill gas extraction and post-processing device for a garbage landfill in view of the above-mentioned problems.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a landfill gas extraction post-processing device for a landfill, comprising a processing box, the inner wall of the processing box is fixedly connected with a partition, the internal cavity of the processing box is divided into a neutralization zone and a decontamination zone by the partition, the interior of the neutralization zone is filled with a sodium hydroxide alkali liquid layer, the upper surface of the processing box located in the decontamination zone is fixedly connected with a first sealing bearing, the inner wall of the first sealing bearing is fixedly connected with a heat-conducting connecting cylinder, the top outer wall of the heat-conducting connecting cylinder is fixedly sleeved with a second sealing bearing, the outer wall of the second sealing bearing is fixedly sleeved with a bent pipe, the output end of the bent pipe passes through the inner wall of the processing box located in the neutralization zone and extends to the interior of the sodium hydroxide alkali liquid layer, and the outer wall of the heat-conducting connecting cylinder is fixedly sleeved with a decontamination mechanism;

[0008] The outer wall of the processing box located in the impurity removal area is fixedly connected to an air intake solenoid valve and a drainage solenoid valve, the upper surface of the processing box is fixedly connected to a PLC controller, the outer wall of the processing box located in the neutralization area is fixedly connected to an alkali solution replenishment solenoid valve and a waste liquid discharge solenoid valve, the upper surface of the processing box located in the neutralization area is provided with a through hole, and the hole wall of the through hole is fixedly connected to an electronic pH meter, and the upper surface of the processing box located in the neutralization area is fixedly connected to a separation mechanism.

[0009] In the above-mentioned landfill gas extraction and post-processing device of a landfill, the impurity removal mechanism includes a filter cartridge fixedly sleeved on the outer wall of a heat-conducting connecting tube, a metal mesh cartridge fixedly sleeved on the outer wall of the filter cartridge, the top of the metal mesh cartridge fixedly connected to the outer wall of the heat-conducting connecting tube, a heat insulation cover fixedly sleeved on the outer wall of the second sealing bearing, the bottom end of the heat insulation cover fixedly connected to the upper surface of the processing box, a through hole is provided on the side wall of the heat insulation cover, and a third sealing bearing is fixedly connected to the hole wall of the through hole, a motor is fixedly connected to the outer wall of the heat insulation cover, the outer wall of the motor output shaft is interference fit connected to the inner wall of the third sealing bearing, a helical gear is fixedly connected to the output end of the motor, a helical gear ring meshing and matching with the helical gear is fixedly sleeved on the outer wall of the heat-conducting connecting tube, a plurality of through holes are provided on the outer wall of the heat insulation cover, and a semiconductor refrigeration plate is fixedly connected to the hole wall of the through hole, and a humidity sensor is fixedly connected to the inner wall of the processing box located in the impurity removal area.

[0010] In the above-mentioned landfill gas extraction and post-processing device of a landfill, the inner wall of the processing box located in the impurity removal area is fixedly connected to two connecting blocks, and the outer walls of the two connecting blocks are jointly fixedly connected to an arc-shaped brush, and the soft hair layer of the arc-shaped brush is in contact with the outer wall of the metal mesh tube.

[0011] In the above-mentioned landfill gas extraction and post-processing device for a garbage landfill, the outer wall of the partition located in the impurity removal area is fixedly connected to a connecting ring, and the inner wall of the connecting ring is fixedly connected to a liquid level meter.

[0012] In the above-mentioned landfill gas extraction and post-processing device of a garbage landfill, the separation mechanism includes a first air permeable pipe fixedly connected to the top of the treatment box located in the neutralization zone, the top of the first air permeable pipe is fixedly connected to an air guide pipe, the outer wall of the air guide pipe is fixedly sleeved with an outer cover, the first air permeable pipe is located inside the outer cover, the bottom end of the outer cover is fixedly connected to the upper surface of the treatment box, the outer wall of the first air permeable pipe is fixedly sleeved with a methane breathable membrane sleeve, the outer wall of the outer cover is fixedly connected to a first unidirectional air pump, and the air inlet end of the first unidirectional air pump is connected through the guide pipe. The tube is fixedly connected to the inner wall of the outer cover, the outer wall of the air outlet end of the air guide tube is fixedly sleeved with a separation cylinder, the outer wall of the separation cylinder is fixedly connected to the outer wall of the outer cover, the inner wall of the separation cylinder is fixedly connected with a second air permeable tube, the air outlet end of the air guide tube is located inside the second air permeable tube, the outer wall of the second air permeable tube is fixedly sleeved with a carbon dioxide breathable membrane sleeve, the outer wall of the separation cylinder is fixedly connected with a second unidirectional air pump, the air inlet end of the second unidirectional air pump is fixedly connected to the inner wall of the separation cylinder through a conduit, and the bottom end of the separation cylinder is fixedly connected with a purification component.

[0013] In the above-mentioned landfill gas extraction and post-processing device of a landfill, the purification component includes a one-way metal air nozzle fixedly connected to the bottom end of the separation cylinder, the air inlet end of the one-way metal air nozzle is located inside the second air permeable pipe, the lower surface of the separation cylinder is fixedly connected to a heat-resistant air guide cover, the side wall of the heat-resistant air guide cover is provided with a through hole one, and the hole wall of the through hole one is fixedly connected to an electronic igniter, a heat-conducting coil is provided in the sodium hydroxide alkali liquid layer, the top end of the heat-conducting coil passes through the upper surface of the processing box and is fixedly connected to the bottom end of the heat-resistant air guide cover, and the air outlet end of the heat-conducting coil passes through the outer wall of the processing box and is fixedly connected to an exhaust pipe.

[0014] In the above-mentioned landfill gas extraction and post-processing device of a landfill, the outer wall of the heat-resistant air guide hood is fixedly connected to a micro air pump, the air outlet end of the micro air pump is fixedly connected to a one-way valve, and the air outlet end of the one-way valve is connected to the interior of the heat-resistant air guide hood.

[0015] In the above-mentioned landfill gas extraction and post-processing device of a landfill, the interior of the heat insulation cover is filled with a coolant layer, the coolant layer is in contact with the cooling side of the semiconductor refrigeration plate, and the outer walls of the heat dissipation sides of multiple semiconductor refrigeration plates are commonly fixedly connected with arc-shaped heat dissipation fins.

[0016] Compared with the existing technology, the advantages of a landfill gas extraction and post-processing device for a landfill are:

[0017] By means of the impurity removal mechanism, air intake solenoid valve, liquid level meter and drainage solenoid valve, when the landfill gas in the landfill is processed, the landfill gas first enters the impurity removal area through the air intake one-way valve, and is filtered through the impurity removal mechanism to remove tiny impurities and moisture. In addition, as the input amount of landfill gas increases, the moisture content of the landfill gas in the impurity removal area increases, and the humidity sensor feeds back the corresponding electrical signal to the PLC controller. The PLC controller can increase the working power of the motor, increase the centrifugal force by faster rotation, and promptly get rid of impurities attached to the outer wall of the filter cartridge to avoid impurity accumulation and clogging the filter channel of the filter cartridge. This mechanism enables the landfill gas extraction post-processing device of the landfill to have the ability of landfill gas pre-treatment, and has the function of automatically adjusting the separation efficiency according to the input amount when separating moisture and impurities in the landfill gas, and ensures that the device can work continuously and reliably.

[0018] By means of the separation mechanism and the sodium hydroxide alkali liquid layer, when the pre-treated landfill gas is transported to the sodium hydroxide alkali liquid layer, the acidic gas in the landfill gas, such as hydrogen sulfide, will react with the sodium hydroxide alkali liquid to neutralize the acidic gas in the landfill gas, and the landfill gas without acidic gas will not cause damage to the metal parts in the device, further avoiding the safety accident of landfill gas leakage caused by the corrosion of the metal parts of the device by the acidic gas. Then the landfill gas is separated from methane and carbon dioxide by the separation mechanism, and then the landfill gas with high methane concentration is transported to the landfill gas deep processing equipment through a pipeline connected to the gas outlet of the first unidirectional vacuum pump to carry out the methane recovery and utilization process, avoiding the waste of methane, an energy gas. The mechanism enables the landfill gas extraction and post-processing device of the garbage landfill to have the function of multiple separation and purification of the landfill gas, and can increase the methane content of the treated landfill gas, improve the convenience and efficiency of methane recovery and reuse in the landfill gas, and can improve the use effect and reliability of the landfill gas extraction and post-processing device of the garbage landfill.

[0019] Through the purification mechanism and micro air pump that are set up, after the landfill gas in the later stage of treatment enters the purification component, due to the reduction of carbon dioxide content, the residual methane in the landfill gas in the later stage of treatment can be ignited by the electronic igniter. After ignition, the heat can heat the temperature of the sodium hydroxide alkaline solution layer through the heat-conducting coil, further accelerating the neutralization reaction rate of the acid gas in the landfill gas and the sodium hydroxide alkaline solution layer, thereby ensuring the landfill gas treatment effect of the landfill. This mechanism enables the device to not only have the function of increasing the reaction temperature of the sodium hydroxide alkaline solution layer, but also effectively improve the landfill gas treatment effect of the landfill gas extraction post-processing device of the landfill, and can improve the reliability of the use of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a landfill gas extraction and post-processing device for a garbage landfill provided by the present invention;

[0021] Figure 2It is a structural schematic diagram of a degassing mechanism in a landfill gas extraction and post-processing device of a garbage landfill provided by the present invention;

[0022] Figure 3 It is a structural schematic diagram of a separation mechanism in a landfill gas extraction and post-processing device for a garbage landfill provided by the present invention;

[0023] Figure 4 It is a structural schematic diagram of a purification component in a landfill gas extraction post-processing device of a garbage landfill provided by the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of a curved heat sink in a landfill gas extraction and post-processing device provided by the present invention, viewed from above;

[0025] Figure 6 The present invention is a schematic structural diagram of an arc-shaped brush in a landfill gas extraction and post-processing device for a garbage landfill.

[0026] In the figure: 1 treatment box, 2 partition, 3 neutralization area, 4 impurity removal area, 5 sodium hydroxide alkali solution layer, 6 impurity removal mechanism, 61 filter cylinder, 62 metal mesh cylinder, 63 heat insulation cover, 64 third sealed bearing, 65 motor, 66 helical gear, 67 helical gear ring, 68 semiconductor refrigeration plate, 69 humidity sensor, 7 separation mechanism, 71 first air permeable pipe, 72 air guide pipe, 73 outer cover, 74 methane breathable membrane sleeve, 75 first one-way air pump, 76 separation cylinder, 77 second air permeable pipe, 78 carbon dioxide breathable membrane sleeve, 79 second one-way air pump, 8 Purification component, 81 one-way metal air nozzle, 82 heat-resistant air guide cover, 83 electronic igniter, 84 heat-conducting coil, 85 exhaust pipe, 9 micro air pump, 10 first sealed bearing, 11 heat-conducting connecting tube, 12 second sealed bearing, 13 elbow, 14 air intake solenoid valve, 15 drainage solenoid valve, 16 PLC controller, 17 alkali solution replenishment solenoid valve, 18 waste liquid discharge solenoid valve, 19 electronic pH meter, 20 connecting block, 21 arc-shaped brush, 22 connecting ring, 23 liquid level meter, 24 one-way valve, 25 coolant layer, 26 arc-shaped heat sink. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1-Figure 6As shown, a landfill gas extraction and post-processing device for a garbage landfill comprises a processing box 1, the inner wall of the processing box 1 is fixedly connected with a partition 2, the internal cavity of the processing box 1 is divided into a neutralization zone 3 and a de-impurity zone 4 by the partition 2, the outer wall of the partition 2 located in the de-impurity zone 4 is fixedly connected with a connecting ring 22, the inner wall of the connecting ring 22 is fixedly connected with a liquid level meter 23, the liquid level meter 23 can monitor the water at the bottom of the de-impurity zone 4, the interior of the neutralization zone 3 is filled with a sodium hydroxide alkaline liquid layer 5, the upper surface of the processing box 1 located in the de-impurity zone 4 is fixedly connected with a first sealed bearing 10, the inner wall of the first sealed bearing 10 is fixedly connected with a heat-conducting connecting tube 11, the top outer wall of the heat-conducting connecting tube 11 is fixedly sleeved with a second sealed bearing 12, the outer wall of the second sealed bearing 12 is fixedly sleeved with a bent pipe 13, the output end of the bent pipe 13 passes through the inner wall of the processing box 1 located in the neutralization zone 3, and extends to the interior of the sodium hydroxide alkaline liquid layer 5.

[0029] The outer wall of the heat-conducting connecting tube 11 is fixedly sleeved with a cleaning mechanism 6, and the cleaning mechanism 6 includes a filter tube 61 fixedly sleeved with the outer wall of the heat-conducting connecting tube, and the outer wall of the filter tube 61 is fixedly sleeved with a metal mesh tube 62, and the top of the metal mesh tube 62 is fixedly connected to the outer wall of the heat-conducting connecting tube 11, and the outer wall of the second sealing bearing 12 is fixedly sleeved with a heat insulation cover 63, and the bottom end of the heat insulation cover 63 is fixedly connected to the upper surface of the processing box 1, and the side wall of the heat insulation cover 63 is provided with a through hole, and the hole wall of the through hole is fixedly connected with a third sealing bearing 64, and the outer wall of the heat insulation cover 63 is fixedly connected with a motor 65, and the outer wall of the output shaft of the motor 65 is connected with the inner wall of the third sealing bearing 64 by interference fit, and the output end of the motor 65 is fixedly connected with a bevel gear 66, and the outer wall of the heat-conducting connecting tube is fixedly sleeved with a bevel gear meshing with the bevel gear 66. The gear ring 67 and the outer wall of the heat insulation cover 63 are provided with multiple through holes, and the hole wall of the through hole is fixedly connected with a semiconductor cooling plate 68, the inner wall of the processing box 1 located in the impurity removal area 4 is fixedly connected with a humidity sensor 69, the interior of the heat insulation cover 63 is filled with a coolant layer 25, the coolant layer 25 is in contact with the cooling side of the semiconductor cooling plate 68, and the outer walls of the heat dissipation side of multiple semiconductor cooling plates 68 are commonly fixedly connected with an arc-shaped heat sink 26, and the arc-shaped heat sink 26 can expand the heat dissipation effect of the heat-generating side of the semiconductor cooling plate 68, thereby ensuring the cooling effect of the semiconductor cooling plate 68. This mechanism enables the landfill gas extraction post-processing device of the landfill to have the ability of landfill gas pre-treatment, and has the function of automatically adjusting the separation efficiency according to the input amount when separating moisture and impurities in the landfill gas, and ensures that the device can work continuously and reliably.

[0030] The outer wall of the processing box 1 located in the impurity removal area 4 is fixedly connected to an air intake solenoid valve 14 and a drain solenoid valve 15, the upper surface of the processing box 1 is fixedly connected to a PLC controller 16, the outer wall of the processing box 1 located in the neutralization area 3 is fixedly connected to an alkali solution replenishing solenoid valve 17 and a waste liquid discharge solenoid valve 18, a through hole is opened on the upper surface of the processing box 1 located in the neutralization area 3, and the hole wall of the through hole is fixedly connected to an electronic pH meter 19, the inner wall of the processing box 1 located in the impurity removal area 4 is fixedly connected to two connecting blocks 20, and the outer walls of the two connecting blocks 20 are jointly fixedly connected to an arc-shaped brush 21, the soft hair layer of the arc-shaped brush 21 is in contact with the outer wall of the metal mesh tube 62, and the arc-shaped brush 21 can further clean the water droplets on the surface of the metal mesh tube 62 and the impurities on the outer wall of the filter tube 61.

[0031] The upper surface of the treatment box 1 located in the neutralization zone 3 is fixedly connected with a separation mechanism 7, and the separation mechanism 7 includes a first air permeable pipe 71 fixedly connected with the top of the treatment box 1 located in the neutralization zone 3, and the top of the first air permeable pipe 71 is fixedly connected with an air guide pipe 72, and the outer wall of the air guide pipe 72 is fixedly sleeved with an outer cover 73, and the first air permeable pipe 71 is located inside the outer cover 73, and the bottom end of the outer cover 73 is fixedly connected to the upper surface of the treatment box 1, and the outer wall of the first air permeable pipe 71 is fixedly sleeved with a methane breathable membrane sleeve 74, and the outer wall of the outer cover 73 is fixedly connected with a first one-way air pump 75, and the air inlet end of the first one-way air pump 75 is fixedly connected with the inner wall of the outer cover 73 through a conduit, and the outer wall of the air outlet end of the air guide pipe 72 is fixedly sleeved with a separation cylinder 76, and the outer wall of the separation cylinder 76 The wall is fixedly connected to the outer wall of the outer cover 73, the inner wall of the separation cylinder 76 is fixedly connected with a second air permeable pipe 77, the air outlet end of the air guide pipe 72 is located inside the second air permeable pipe 77, the outer wall of the second air permeable pipe 77 is fixedly sleeved with a carbon dioxide breathable membrane sleeve 78, the outer wall of the separation cylinder 76 is fixedly connected with a second one-way air pump 79, and the air inlet end of the second one-way air pump 79 is fixedly connected to the inner wall of the separation cylinder 76 through a conduit. This mechanism enables the landfill gas extraction and post-processing device of the landfill to have the function of multiple separation and purification of landfill gas, and can increase the methane content of the landfill gas after treatment, improve the convenience and efficiency of methane recovery and reuse in the landfill gas, and can improve the use effect and reliability of the landfill gas extraction and post-processing device of the landfill.

[0032] The bottom end of the separation cylinder 76 is fixedly connected with a purification component 8, and the purification component 8 includes a one-way metal air nozzle 81 fixedly connected with the bottom end of the separation cylinder 76, and the air inlet end of the one-way metal air nozzle 81 is located inside the second air permeable pipe 77. The lower surface of the separation cylinder 76 is fixedly connected with a heat-resistant air guide cover 82, and the outer wall of the heat-resistant air guide cover 82 is fixedly connected with a micro air pump 9. The air outlet end of the micro air pump 9 is fixedly connected with a one-way valve 24, and the air outlet end of the one-way valve 24 is connected with the inside of the heat-resistant air guide cover 82. The PLC controller 16 controls the micro air pump 9 and the one-way valve 24 to transport air to the heat-resistant air guide cover 82 to ensure that the landfill The residual methane in the gas can burn in an oxygen-sufficient environment. A through hole 1 is opened on the side wall of the heat-resistant gas-conducting hood 82, and an electronic igniter 83 is fixedly connected to the hole wall of the through hole 1. A heat-conducting coil 84 is arranged in the sodium hydroxide alkali liquid layer 5. The top of the heat-conducting coil 84 passes through the upper surface of the treatment box 1 and is fixedly connected to the bottom end of the heat-resistant gas-conducting hood 82. The gas outlet end of the heat-conducting coil 84 passes through the outer wall of the treatment box 1 and is fixedly connected to an exhaust pipe 85. This mechanism enables the device to have the function of increasing the reaction temperature of the sodium hydroxide alkali liquid layer 5, thereby effectively improving the landfill gas treatment effect of the landfill gas extraction post-treatment device of the landfill.

[0033] The humidity sensor 69, the electronic pH meter 19 and the liquid level meter 23 are all electrically connected to the input end of the PLC controller 16 through wires, and the motor 65, the semiconductor refrigeration plate 68, the first one-way air pump 75, the second one-way air pump 79, the electronic igniter 83, the micro air pump 9, the air intake solenoid valve 14, the drainage solenoid valve 15, the alkali solution replenishment solenoid valve 17 and the waste liquid discharge solenoid valve 18 are all electrically connected to the output end of the PLC controller 16 through wires. The humidity sensor 69, the electronic pH meter 19 and the liquid level meter 23 can send electrical signals of corresponding physical quantities to the PLC controller 16, and the PLC controller 16 controls the operation of the corresponding equipment at the output end according to the corresponding electrical signals. The above-mentioned powered equipment and electrical connections are prior art and will not be repeated here.

[0034] The operating principle of the present invention is described as follows: when the landfill gas from the landfill is treated, first the PLC controller 16 controls the semiconductor refrigeration 68 and the motor 65 to be energized, and the air inlet solenoid valve 14 is opened, and then the landfill gas from the landfill is input into the impurity removal area 4, and at the same time, the cooling side of the semiconductor refrigeration plate 68 reduces the temperature of the heat-conducting connecting cylinder 11 and the metal mesh cylinder 62 through the cooling liquid layer 25, and then the landfill gas from the impurity removal area 4 is impurity-removed through the filter cylinder 61, and the micro impurities are trapped by the outer wall of the filter cylinder 61, and at the same time, the moisture in the landfill gas contacts the low-temperature metal mesh cylinder 62 and liquefies into water droplets, and the water droplets are attached to the metal mesh cylinder 62. The water drops are attached to the surface of the metal mesh cylinder 62, and the water drops can also easily dissolve the micro impurities attached to the outer wall of the filter cylinder 61. Then the motor 65 rotates the heat-conducting connecting cylinder 11 through the bevel gear 66 and the bevel gear ring 67. The heat-conducting connecting cylinder 11 drives the metal mesh cylinder 62 and the filter cylinder 61 to rotate. The centrifugal force generated by the rotation causes the water drops on the surface of the metal mesh cylinder 62 and the impurities on the outer wall of the filter cylinder 61 to fall off and accumulate at the bottom of the impurity removal area 4. The accumulated water is monitored in real time by the liquid level meter 23, and the monitoring results are fed back to the PLC controller 16. When the accumulated water depth reaches the water depth threshold preset by the PLC controller 16, P The LC controller 16 controls the drain solenoid valve 15 to be powered on and open for 5 seconds. During the 5 seconds, the amount of water accumulated at the bottom of the impurity removal area 4 is only reduced, and the water is not completely discharged, so that some water still exists on the top of the drain solenoid valve 15 for water sealing treatment, thereby preventing the landfill gas in the impurity removal area 4 from leaking through the powered-on drain solenoid valve 15. In addition, as the input amount of landfill gas increases, the moisture content of the landfill gas in the impurity removal area 4 increases, and the humidity sensor 69 feeds back the corresponding electrical signal to the PLC controller 16. The PLC controller 16 can increase the working power of the motor 65 by rotating faster. The centrifugal force is increased by rotating to timely get rid of impurities attached to the outer wall of the filter cartridge 61 to avoid impurities accumulating and clogging the filter channel of the filter cartridge 61. When the input amount of landfill gas is small, the motor 65 operates at a lower power to achieve the purpose of reducing the power consumption of the device. The landfill gas after impurity removal and drying is then transported to the sodium hydroxide solution layer 5 in the neutralization zone 3 through the elbow 13. This mechanism enables the landfill gas extraction post-processing device of the landfill to have the ability of landfill gas pretreatment, and has the function of automatically adjusting the separation efficiency according to the input amount when separating water and impurities from the landfill gas, and ensures that the device can work continuously and reliably.

[0035] When the pre-treated landfill gas is transported to the sodium hydroxide alkali solution layer 5, the acidic gas in the landfill gas, such as hydrogen sulfide, will react with the sodium hydroxide alkali solution to neutralize the acidic gas in the landfill gas and produce sodium sulfide and water. In addition, the landfill gas without acidic gas will not cause damage to the metal parts in the device, further avoiding the safety accident of landfill gas leakage caused by the corrosion of the metal parts of the device due to acidic gas. The landfill gas separated from the acidic gas enters the first air permeable pipe 71, the air guide pipe 72 and the second air permeable pipe 77 in sequence. At this time, the PLC controller 16 controls the first unidirectional air pump 75 and the second unidirectional air pump 79. The first unidirectional air pump 75 sucks the outer cover through the air guide pipe 72. The air in the outer cover 73 is sucked out to form a negative pressure environment in the outer cover 73. Under the cooperation of the negative pressure environment, 80%-90% of the methane in the landfill gas will quickly and preferentially pass through the methane breathable membrane sleeve 74. The methane breathable membrane preferentially passes through the methane because the size and shape of the methane molecules are adapted to the microstructure of the membrane, so that the methane molecules can pass through the pores more smoothly. At the same time, the polarity and other characteristics of methane determine that its solubility and diffusion coefficient in the membrane are relatively large, so that it preferentially passes through the breathable membrane. Then, the landfill gas with high methane concentration is transported to the landfill gas deep processing equipment through the pipeline connected to the outlet end of the first unidirectional air pump 75 for methane recovery and utilization process, thereby avoiding the waste of methane, an energy gas, such as through High-concentration and pure methane is obtained through deep treatment by the gas separation membrane system and the pressure swing adsorption separation system. The pure methane has a higher combustion calorific value and more stable combustion performance, and can be used as a high-quality energy source in the fields of power generation and heating. Similarly, the second one-way vacuum pump 79 sucks the air from the separation cylinder 76 to create a negative pressure environment inside the separation cylinder 76. Then the landfill gas in the second air permeable pipe 77, especially 80%-90% of the carbon dioxide in the landfill gas, quickly and preferentially passes through the carbon dioxide breathable membrane sleeve 78 under the cooperation of the negative pressure environment in the separation cylinder 76. The carbon dioxide breathable membrane preferentially passes through carbon dioxide because the size and shape of carbon dioxide molecules are more compatible with the microstructure of the membrane. , so that carbon dioxide has a higher solubility and diffusion coefficient on the carbon dioxide breathable membrane, and carbon dioxide has a slightly stronger polarity, and the interaction with the membrane material makes it easier to pass through, and then the carbon dioxide is discharged to the outside through the second one-way air pump 79 and the corresponding gas pipeline, and then after multiple separations, the landfill gas containing a small amount of methane is transported to the purification component 8. This mechanism enables the landfill gas extraction and post-processing device in the landfill to have the function of multiple separation and purification of landfill gas, and can increase the methane content of the landfill gas after treatment, improve the convenience and efficiency of methane recovery and reuse in the landfill gas, and can improve the use effect and reliability of the landfill gas extraction and post-processing device in the landfill.

[0036] After the landfill gas at the later stage of treatment enters the purification component 8, the PLC controller 16 controls the electronic igniter 83 to ignite, and then the residual methane in the landfill gas at the later stage of treatment is ejected from the one-way metal air nozzle 81 and ignited by the electronic igniter 83, and a large amount of carbon dioxide in the landfill gas is separated by the carbon dioxide breathable membrane sleeve 78, so that the residual methane in the landfill gas at the later stage of treatment can be reliably ignited by the electronic igniter 83. At this time, the flow rate and flow velocity of the ejected methane can be controlled by the constraint of the one-way metal air nozzle 81, so that the methane is ejected at a relatively stable speed, which can avoid the formation of a high-concentration methane accumulation area, thereby reducing the risk of reaching the explosion limit. The PLC controller 16 controls the micro air pump 9 and the one-way valve 24 to deliver air to the heat-resistant air guide cover 82 to ensure that the residual methane in the landfill gas can burn in an oxygen-sufficient environment. At the same time, the blown-in air will quickly mix with the residual methane in the landfill gas ejected from the one-way metal air nozzle 81, so that the mixing ratio of methane and air is kept outside the explosion limit range, which can effectively avoid the explosion of methane during combustion. Then, the heat after the residual methane burns enters the heat conducting coil 84 with the air and heats the sodium hydroxide alkali solution layer 5. After the sodium hydroxide alkali solution layer 5 is heated, it can accelerate the breakage of molecular bonds and the movement of molecules, and at the same time accelerate the hydrogen and oxygen The sodium hydroxide alkali solution reacts with the acidic gas in the landfill gas to ensure the landfill gas treatment effect of the landfill. Finally, the waste gas in the heat transfer coil 84 is transported to the air treatment equipment through the exhaust pipe 85 for purification treatment. In addition, as the amount of acidic gas in the landfill gas neutralized by the sodium hydroxide alkali solution layer 5 increases, the pH value of the sodium hydroxide alkali solution layer 5 decreases and is monitored in real time by the electronic pH meter 19. The data monitored in real time by the electronic pH meter 19 is fed back to the PLC controller 16 in the form of an electrical signal. When the pH value of the sodium hydroxide alkali solution layer 5 reaches the pH threshold preset by the PLC controller 16, the PLC controller 16 can control the alkali solution replenishment solenoid valve 17 and the waste liquid The discharge solenoid valve 18 is opened, and the alkali liquid replenishing solenoid valve 17 can automatically input highly alkaline sodium hydroxide alkali liquid through the corresponding pipeline, and the waste liquid discharge solenoid valve 18 discharges the waste liquid to the waste liquid treatment equipment through the corresponding pipeline, so that the sodium hydroxide alkali liquid layer 5 in the device can be replaced, ensuring that the sodium hydroxide alkali liquid layer 5 in the device can continuously and reliably neutralize the acidic gas in the landfill gas. This mechanism enables the device to not only have the function of increasing the reaction temperature of the sodium hydroxide alkali liquid layer 5, but also has the function of automatically replacing the sodium hydroxide alkali liquid layer 5, thereby effectively improving the landfill gas treatment effect of the landfill gas extraction post-treatment device of the landfill, and can improve the reliability of the use of the device.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A landfill gas extraction and post-processing device for a landfill, comprising a processing box (1), characterized in that: The inner wall of the treatment box (1) is fixedly connected to a partition (2); the inner cavity of the treatment box (1) is divided into a neutralization zone (3) and an impurity removal zone (4) by the partition (2); the interior of the neutralization zone (3) is filled with a sodium hydroxide alkali liquid layer (5); the upper surface of the treatment box (1) located in the impurity removal zone (4) is fixedly connected to a first sealed bearing (10); the inner wall of the first sealed bearing (10) is fixedly connected to a heat-conducting connecting tube (11); the top outer wall of the heat-conducting connecting tube (11) is fixedly sleeved with a second sealed bearing (12); the outer wall of the second sealed bearing (12) is fixedly sleeved with a bent pipe (13); the output end of the bent pipe (13) passes through the inner wall of the treatment box (1) located in the neutralization zone (3) and extends to the interior of the sodium hydroxide alkali liquid layer (5); the outer wall of the heat-conducting connecting tube (11) is fixedly sleeved with an impurity removal mechanism (6); The impurity removal mechanism (6) comprises a filter cartridge (61) fixedly sleeved on the outer wall of the heat-conducting connecting tube, a metal mesh cartridge (62) fixedly sleeved on the outer wall of the filter cartridge (61), a top end of the metal mesh cartridge (62) fixedly connected to the outer wall of the heat-conducting connecting tube (11), a heat insulation cover (63) fixedly sleeved on the outer wall of the second sealing bearing (12), a bottom end of the heat insulation cover (63) fixedly connected to the upper surface of the processing box (1), a through hole formed on the side wall of the heat insulation cover (63), and a third sealing bearing (64) fixedly connected to the hole wall of the through hole; The outer wall of the treatment box (1) located in the impurity removal zone (4) is fixedly connected to an air intake solenoid valve (14) and a drainage solenoid valve (15); the upper surface of the treatment box (1) is fixedly connected to a PLC controller (16); the outer wall of the treatment box (1) located in the neutralization zone (3) is fixedly connected to an alkali solution replenishment solenoid valve (17) and a waste liquid discharge solenoid valve (18); a through hole is opened on the upper surface of the treatment box (1) located in the neutralization zone (3), and an electronic pH meter (19) is fixedly connected to the hole wall of the through hole; and the upper surface of the treatment box (1) located in the neutralization zone (3) is fixedly connected to a separation mechanism (7); The separation mechanism (7) comprises a first air permeable tube (71) fixedly connected to the top of the treatment box (1) located in the neutralization zone (3); the top of the first air permeable tube (71) is fixedly connected to an air guide tube (72); the outer wall of the air guide tube (72) is fixedly sleeved with an outer cover (73); the first air permeable tube (71) is located inside the outer cover (73); the bottom end of the outer cover (73) is fixedly connected to the upper surface of the treatment box (1); the outer wall of the first air permeable tube (71) is fixedly sleeved with a methane air permeable membrane sleeve (74); the outer wall of the outer cover (73) is fixedly connected to a first one-way air pump (75); the air inlet end of the first one-way air pump (75) is fixedly connected to the inner wall of the outer cover (73) via a conduit; The impurity removal mechanism (6) further comprises a motor (65) fixedly connected to the outer wall of the heat insulation cover (63); the outer wall of the output shaft of the motor (65) is connected to the inner wall of the third sealed bearing (64) by interference fit; the output end of the motor (65) is fixedly connected to a bevel gear (66); the outer wall of the heat conductive connecting tube is fixedly sleeved with a bevel gear ring (67) meshing with the bevel gear (66); the outer wall of the heat insulation cover (63) is provided with a plurality of through holes, and the hole walls of the through holes are fixedly connected to semiconductor cooling sheets (68); and the inner wall of the processing box (1) located in the impurity removal area (4) is fixedly connected to a humidity sensor (69); The separation mechanism (7) further comprises a separation cylinder (76) fixedly sleeved with the outer wall of the air outlet end of the air guide tube (72); the outer wall of the separation cylinder (76) is fixedly connected to the outer wall of the outer cover (73); the inner wall of the separation cylinder (76) is fixedly connected with a second air permeable tube (77); the air outlet end of the air guide tube (72) is located inside the second air permeable tube (77); the outer wall of the second air permeable tube (77) is fixedly sleeved with a carbon dioxide permeable membrane sleeve (78); the outer wall of the separation cylinder (76) is fixedly connected with a second one-way air pump (79); the air inlet end of the second one-way air pump (79) is fixedly connected to the inner wall of the separation cylinder (76) via a conduit; the bottom end of the separation cylinder (76) is fixedly connected with a purification component (8); The purification component (8) comprises a one-way metal air nozzle (81) fixedly connected to the bottom end of the separation cylinder (76), the air inlet end of the one-way metal air nozzle (81) is located inside the second air permeable pipe (77), the lower surface of the separation cylinder (76) is fixedly connected to a heat-resistant air guide cover (82), the side wall of the heat-resistant air guide cover (82) is provided with a through hole 1, and the hole wall of the through hole 1 is fixedly connected to an electronic igniter (83), a heat-conducting coil (84) is provided in the sodium hydroxide alkali solution layer (5), the top end of the heat-conducting coil (84) passes through the upper surface of the treatment box (1) and is fixedly connected to the bottom end of the heat-resistant air guide cover (82), and the air outlet end of the heat-conducting coil (84) passes through the outer wall of the treatment box (1) and is fixedly connected to an exhaust pipe (85); The outer wall of the heat-resistant air guide cover (82) is fixedly connected to a micro air pump (9), the air outlet end of the micro air pump (9) is fixedly connected to a one-way valve (24), and the air outlet end of the one-way valve (24) is connected to the interior of the heat-resistant air guide cover (82); The interior of the heat insulation cover (63) is filled with a cooling liquid layer (25), the cooling liquid layer (25) is in contact with the cooling side of the semiconductor cooling sheet (68), and the outer walls of the heat dissipation sides of the plurality of semiconductor cooling sheets (68) are commonly fixedly connected with an arc-shaped heat dissipation sheet (26).

2. The landfill gas extraction and post-processing device of a landfill according to claim 1, characterized in that: The inner wall of the processing box (1) located in the impurity removal area (4) is fixedly connected to two connection blocks (20), and the outer walls of the two connection blocks (20) are jointly fixedly connected to an arc-shaped brush (21), and the soft hair layer of the arc-shaped brush (21) is in contact with the outer wall of the metal mesh cylinder (62).

3. The landfill gas extraction and post-processing device of a garbage landfill according to claim 1, characterized in that: The outer wall of the partition (2) located in the impurity removal area (4) is fixedly connected to a connecting ring (22), and the inner wall of the connecting ring (22) is fixedly connected to a liquid level meter (23).

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