Landfill methane resource recycling system and method

Abstract

The present invention discloses a landfill methane resource recycling system and method, comprising a sealing layer and a leveling layer sequentially laid on a garbage pile layer, a gas collection system and a precipitation system; the gas collection system comprises a plurality of exhaust plates inserted in the garbage pile layer and a gas collection pipe laid in the sealing layer; the bottom of the exhaust plate is inserted to the bottom of the garbage pile layer, the top is located in the sealing layer and is connected to the gas collection pipe, and a vacuum pumping device is also provided on the gas collection pipe; the precipitation system comprises a precipitation booster pipe inserted in the garbage pile layer and a pipeline laid in the sealing layer, the lower end of the precipitation booster pipe is inserted to the bottom of the garbage pile layer, and the top is connected to the pipeline; a pumping device is also provided on the pipeline; the recycling method comprises a precipitation process and a gas collection process.

Description

Technical Field

[0001] The present invention relates to the technical field of utilizing garbage to recover biogas, and in particular to a system and method for recovering biogas resources from a garbage landfill. Background Art

[0002] Landfill is the main method of domestic waste treatment. It is simple, easy and inexpensive, and can also recycle energy. In the landfill, the waste first undergoes aerobic decomposition, consuming oxygen and generating a large amount of heat, and then undergoes anaerobically decomposition to produce biogas.

[0003] Domestic landfill biogas resource recovery (reference Figure 3 ) is as follows: a well 40 is dug in the garbage layer 10, with an average well of 6-12 meters, the well is filled with stones or broken bricks, a gas pipeline 41 is connected to the wellhead, and the gas pipeline 41 is connected to the collection station. The problems of this method are:

[0004] First, well digging is expensive and costly;

[0005] Second, the small number of wells prevents the collection of sufficient biogas to generate electricity in power plants.

[0006] Foreign landfill biogas resource recovery (reference Figure 4 ) is as follows: an exhaust plate 21 is inserted into the garbage pile layer 10, a sand layer 13, a gravel layer 14, a sealing layer 11 and a leveling layer 12 are laid above the garbage pile layer 10, the top of the exhaust plate 21 is arranged in the sand layer 13, and a gas collecting pipe 22 is arranged in the gravel layer 14; the biogas generated in the garbage pile layer 10 enters the sand layer 13 and the gravel layer 14 through the exhaust plate 21, and the gas collecting pipe 22 collects the biogas in the sand layer 13 and the gravel layer 14 and transports it to a collection station. The problems with this method are: many layers need to be laid and the gas collection efficiency is low.

[0007] In addition, garbage will release heat during aerobic and anaerobic reactions, and the large amount of accumulated water and leachate in the garbage pile will absorb heat, thereby lowering the temperature of the entire garbage pile, which is not conducive to the generation of biogas. Summary of the invention

[0008] The purpose of the present invention is to solve the problems existing in the background technology and to provide a landfill methane resource recovery and utilization system and method with simple structure, low cost and high gas collection efficiency.

[0009] In order to achieve the above-mentioned object of the invention, the technical solution of the present invention is:

[0010] The landfill methane resource recovery and utilization system comprises a sealing layer and a leveling layer sequentially laid on a garbage pile layer, as well as a gas collection system and a precipitation system; the gas collection system comprises a plurality of exhaust plates inserted in the garbage pile layer and a gas collection pipe laid in the sealing layer; the bottom of the exhaust plate is inserted to the bottom of the garbage pile layer, the top is located in the sealing layer and is connected to the gas collection pipe, and a vacuum pump is also provided on the gas collection pipe; the precipitation system comprises a precipitation booster pipe inserted in the garbage pile layer and a pipeline laid in the sealing layer, the lower end of the precipitation booster pipe is inserted to the bottom of the garbage pile layer, and the top is connected to the pipeline; a pumping device is also provided on the pipeline.

[0011] Furthermore, the exhaust plate and the precipitation boost pipe are spaced apart.

[0012] Furthermore, the spacing between the exhaust plates is 80cm-120cm, and the end of the gas collecting pipe is connected to the gas storage tank.

[0013] Furthermore, the exhaust plate includes a frame and a filter cloth wrapped around the outside of the frame.

[0014] Furthermore, the interval between the precipitation boosting pipes is 160cm-240cm.

[0015] A method for recycling and utilizing biogas from a landfill, comprising a precipitation process and a gas collection process; the precipitation process is to extract the accumulated water and leachate in a garbage pile layer through a pumping device and a precipitation booster pipe, thereby lowering the water level in the garbage pile layer and maintaining the reaction temperature in the garbage pile layer; the gas collection process is to allow the biogas generated by garbage in the garbage pile layer to pass through a filter cloth, enter an exhaust plate, and enter a gas storage tank from the top of the exhaust plate through a gas collection pipe, thereby completing the collection of biogas.

[0016] The beneficial effects of the present invention are:

[0017] First: The top of the exhaust plate is directly connected to the gas collecting pipe. Compared with foreign technologies, this pipe network structure does not require laying many layers and has high gas collecting efficiency. Compared with domestic technologies, it has low cost, simple installation and high gas collecting efficiency.

[0018] Second: Set up precipitation and booster pipes to extract the accumulated water and leachate in the garbage pile layer, lower the water level in the garbage pile layer, maintain the reaction temperature in the garbage pile layer, help produce biogas, increase the storage space of biogas, and prevent the garbage pile layer from landslides. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a side view of the present invention.

[0020] Figure 2 Schematic diagram of the exhaust plate structure.

[0021] Figure 3It is a schematic diagram of the existing domestic technical structure.

[0022] Figure 4 This is a schematic diagram of the existing foreign technology structure.

[0023] In the figure: 10 is a garbage pile layer, 11 is a sealing layer, 12 is a leveling layer, 13 is a sand layer, 14 is a gravel layer, 20 is a gas collecting system, 21 is an exhaust plate, 21.1 is a frame, 21.2 is a filter cloth, 22 is a gas collecting pipe, 23 is a vacuum device, 30 is a precipitation system, 31 is a precipitation booster pipe, 32 is a pipeline, 33 is a pumping device, 40 is a well, and 41 is a gas pipeline. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings.

[0025] The landfill methane resource recovery and utilization system includes a sealing layer 11 and a leveling layer 12 sequentially laid on a garbage pile layer 10, as well as a gas collection system 20 and a precipitation system 30; the gas collection system 20 includes a plurality of exhaust plates 21 inserted in the garbage pile layer 10 and a gas collecting pipe 22 laid in the sealing layer 11; the bottom of the exhaust plate 21 is inserted to the bottom of the garbage pile layer 10, the top is located in the sealing layer 11 and the top is connected to the gas collecting pipe 22, and a vacuum device 23 is also provided on the gas collecting pipe 22; the precipitation system 30 includes a precipitation booster pipe 31 inserted in the garbage pile layer 10 and a pipeline 32 laid in the sealing layer 11, the lower end of the precipitation booster pipe 31 is inserted to the bottom of the garbage pile layer 10, and the top is connected to the pipeline 32; a pumping device 33 is also provided on the pipeline 32.

[0026] Furthermore, the precipitation boosting pipe 31 is a prior art and has been disclosed in the patent CN112878308B authorized by the company.

[0027] Furthermore, the top of the exhaust plate 21 is directly connected to the gas collecting pipe 22. Compared with foreign technologies, this pipe network structure does not require laying many layers and has high gas collecting efficiency. Compared with domestic technologies, it has low cost, simple installation and high gas collecting efficiency.

[0028] Furthermore, the exhaust plate 21 and the dewatering and boosting pipe 31 are arranged at intervals, and generally, two exhaust plates 21 are arranged with one dewatering and boosting pipe 31 therebetween.

[0029] Furthermore, the spacing between the exhaust plates 21 is 80 cm-120 cm, and the end of the gas collecting pipe 22 is connected to the gas storage tank, and of course, it can also be directly connected to the gas collecting station.

[0030] Furthermore, the exhaust plate 21 includes a frame 21.1 and a filter cloth 21.2 wrapped around the outside of the frame 21.1.

[0031] Furthermore, the interval between the precipitation boosting pipes 31 is 160cm-240cm.

[0032] A method for recycling and utilizing biogas in a landfill includes a precipitation process and a gas collection process; the precipitation process is to extract the accumulated water and leachate in a garbage pile layer 10 through a pumping device 33 and a precipitation booster pipe 31, thereby lowering the water level in the garbage pile layer 10, maintaining the reaction temperature in the garbage pile layer 10, increasing the storage space of biogas, and preventing the garbage pile layer 10 from sliding.

[0033] Furthermore, the heat released by the garbage during the reaction process and the maintenance of the reaction temperature in the garbage pile layer 10 can make the anaerobic digestion process more stable; at the same time, due to the effect of high temperature, the pathogenic bacteria content of the anaerobic product is reduced; therefore, it is very important to extract the accumulated water and leachate in the garbage pile layer 10.

[0034] The gas collection process is that the biogas generated by the garbage in the garbage layer 10 passes through the filter cloth 21.2, enters the exhaust plate 21, and enters the gas storage tank through the gas collecting pipe 22 from the top of the exhaust plate 21 to complete the collection of biogas. Of course, the biogas can also be directly transported to the gas collection station.

[0035] The described embodiments are only some embodiments of the present invention, not all 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.

Claims

1. The landfill biogas resource recovery and utilization system is characterized by: The invention comprises a sealing layer (11) and a leveling layer (12) which are sequentially laid on a garbage pile layer (10), as well as an air collection system (20) and a precipitation system (30); the air collection system (20) comprises a plurality of exhaust plates (21) inserted in the garbage pile layer (10) and an air collection pipe (22) laid in the sealing layer (11); the bottom of the exhaust plate (21) is inserted into the bottom of the garbage pile layer (10), the top is located in the sealing layer (11) and the top is connected to the air collection pipe (22), and a vacuum device (23) is also provided on the air collection pipe (22); the precipitation system (30) comprises a precipitation booster pipe (31) inserted in the garbage pile layer (10) and a pipe (32) laid in the sealing layer (11); the lower end of the precipitation booster pipe (31) is inserted into the bottom of the garbage pile layer (10), and the top is connected to the pipe (32); the pipe (32) is also provided with a pumping device (33); The exhaust plate (21) and the precipitation booster pipe (31) are arranged at intervals; The spacing between the exhaust plates (21) is 80 cm to 120 cm, and the end of the gas collecting pipe (22) is connected to the gas storage tank; The exhaust plate (21) comprises a frame (21.1) and a filter cloth (21.2) wrapped around the outside of the frame (21.1).

2. The landfill methane resource recovery and utilization system according to claim 1 is characterized by: The distance between the precipitation and pressure-boosting pipes (31) is 160 cm to 240 cm.

3. A working method of the landfill methane resource recovery and utilization system according to any one of claims 1 to 2, characterized in that: The method comprises a precipitation process and a gas collection process; the precipitation process is to extract the accumulated water and leachate in the garbage pile layer (10) through a pumping device (33) and a precipitation booster pipe (31), thereby lowering the water level in the garbage pile layer (10) and maintaining the reaction temperature in the garbage pile layer; the gas collection process is to allow the biogas generated by the garbage in the garbage pile layer (10) to pass through the filter cloth (21.2), enter the exhaust plate (21), and enter the gas storage tank from the top of the exhaust plate (21) through the gas collection pipe (22), thereby completing the collection of biogas.

Images