A landfill biogas collection pipeline structure and biogas collection method

Abstract

The present invention discloses a landfill methane collection pipeline structure and a methane collection method, comprising a landfill pile buried in the landfill, a geomembrane covering the landfill pile, and a methane collection net covering the top of the geomembrane to cover and press down the landfill pile; the methane collection net is composed of an outer ring, an intermediate ring and an inner ring, and the outer ring, the intermediate ring and the inner ring are arranged from the outside to the inside and connected to each other by a connecting pipe to form a hemispherical woven net structure covering the top of the landfill pile. The present invention places the traditional pipeline structure built into the landfill pile outside the landfill pile, uses the pipeline structure as the external stability of the landfill pile, increases the covering stability of the geomembrane, and at the same time, the external pipeline structure can reduce the impact of the complex environment of the landfill pile on the pipeline, and increase the service life of the pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of biogas collection, and in particular to a biogas collection pipeline structure and a biogas collection method for a landfill. Background Art

[0002] Landfills are centralized garbage storage sites that use sanitary landfill methods. They are widely used in China because of their low cost and good sanitation. As the landfilled garbage degrades, it will produce a large amount of biogas. In order to reduce pollution and improve energy utilization, these biogases need to be recycled.

[0003] At present, a large number of collection pipes need to be buried in landfills. These collection pipes are laid in landfills for a long time. Due to the complex internal environment of the landfill, which is a humid and corrosive environment, the pipes buried inside for a long time are prone to corrosion, deformation and blockage. Therefore, there are obviously many problems with the purpose of the pipe layout structure; in addition, since the geomembrane only covers the surface of the landfill, the surface of the covering film is prone to loosening during normal use, and the gas generated inside the landfill will escape to the outside, polluting the environment and increasing the odor of the surrounding environment. Therefore, it is generally necessary to set a fixed structure outside the geomembrane, making the overall structure more complicated. Summary of the invention

[0004] The technical problem to be solved by the present invention is a landfill methane collection pipeline structure and a methane collection method. The traditional built-in pipeline structure is arranged on the outside of the geomembrane, and the pipeline structure arranged on the outside of the geomembrane is used as a stable means for the use of the geomembrane. At the same time, the external pipeline structure can also effectively increase the service life of the pipeline and reduce the impact of the landfill on the life of the pipeline.

[0005] The present invention is realized by the following technical scheme: a landfill methane collection pipeline structure and a methane collection method, comprising a landfill pile buried in the landfill, a geomembrane covering the landfill pile, and a methane collection net covering the top of the geomembrane for covering and pressing down the landfill pile;

[0006] The biogas collection net is composed of an outer ring, a middle ring and an inner ring, which are arranged from outside to inside and connected to each other by connecting pipes to form a hemispherical woven net structure covering the top of the landfill;

[0007] An elastic collecting pipe is arranged in each connecting pipe, and a bending convex portion is formed at the intersection of the middle ring and the inner ring of the connecting pipe, and the bending convex portion passes through the geomembrane and extends into the landfill. An inflatable component is arranged on one side of the outer ring, and an inflatable cavity is arranged in the outer ring. The inflatable cavity is connected and communicated with each connecting pipe. The inflatable cavity is inflated by the inflatable component so that the elastic collecting pipe passes through the bending convex portion and is inserted into the landfill. The gas in the connecting pipe is discharged so that the elastic collecting pipe retracts into the connecting pipe.

[0008] A central tube is arranged at the middle position of the top of the inner ring. The central tube is connected to each connecting tube through a hard fixed tube. The central tube is connected to an external suction pump through a suction pipe to extract and collect the biogas in the landfill.

[0009] As a preferred technical solution, the connecting tube includes a first connecting tube and a second connecting tube, the length of the first connecting tube is greater than that of the second connecting tube, the first connecting tube respectively connects the outer ring, the middle ring and the inner ring, the second connecting tube connects the outer ring and the middle ring, the first connecting tube forms a first bending bulge at the position of the inner ring, the first bending bulge passes through the inner ring and is located at the lower end surface of the inner ring, the second connecting tube forms a second bending bulge at the position of the middle ring, the second bending bulge passes through the middle ring and is located at the lower end surface of the middle ring.

[0010] As a preferred technical solution, the elastic collecting tube adopts a hollow elastic metal tube, and one or more collecting holes are arranged at the upper end thereof. An active cavity is arranged in the first connecting tube and the second connecting tube. A sealing piston is arranged near the outer ring on the collecting tube, and the active cavity is sealed by the sealing piston. The active cavity forms an arc-shaped transition cavity at the position of the bending convex portion. The elastic collecting tube passes through the arc-shaped transition cavity and extends to the outside. The first connecting tube and the second connecting tube are arranged as a gas-guiding docking structure inside the bending convex portion. When the sealing piston moves to the position of the gas-guiding docking structure, the collecting tube is connected and conducted with the center tube through the gas-guiding docking structure.

[0011] As a preferred technical solution, the gas-guiding docking structure includes a limit stop ring arranged in the movable cavity. The limit stop ring is hollow inside and is docked and communicated with the hollow cavity arranged in the connecting pipe through the gas guide channel. The hollow cavity is docked and communicated with the fixed pipe. One or more gas-guiding pins are arranged on the side of the limit stop ring facing the sealing piston. A gas-guiding hole is arranged on the sealing piston opposite to the gas-guiding pin. When the sealing piston moves to the position of the limit stop ring, the gas-guiding pin is inserted into the gas-guiding hole. The sealing piston has a hollow gas-guiding cavity, which is connected and communicated with the hollow cavity through the gas-guiding pin, and the gas-guiding cavity in the sealing piston is connected and communicated with the collecting tube.

[0012] As a preferred technical solution, a connecting spring is fixedly arranged between the sealing piston and the top surface of the movable chamber, one end of the connecting spring is fixedly welded to the top surface of the movable chamber, and the other end is fixedly bonded to the sealing piston.

[0013] As a preferred technical solution, the outer end of the air guide hole is in the shape of a trumpet opening, and a plurality of O-rings are provided on the inner wall of the air guide hole.

[0014] As a preferred technical solution, the inflation component includes an inflation tube fixedly connected to the outer ring, one end of the inflation tube is connected to an inflation extension tube, an electromagnetic valve is installed on the inflation extension tube, and the outside of the inflation extension tube is connected to an inflation pump. The sealing piston is pushed by manually controlling the inflation pump to work and filling gas into each connecting tube.

[0015] A biogas collection method comprises the following steps:

[0016] Step 1: Lay a layer of geomembrane on the landfill, and set the arc size of the biogas collection net according to the width of the geomembrane;

[0017] Step 2: Pass the bent convex part of the connecting pipe through the geomembrane and extend it into the landfill;

[0018] Step 3: Use an air pump to inject gas to push out the elastic collection pipe, so that the collection pipe is completely inserted into the landfill;

[0019] Step 4: Turn on the vacuum pump and use the collection pipe to extract the biogas. The biogas enters the central pipe and is then discharged and collected from the central pipe.

[0020] The beneficial effect of the present invention is that the present invention arranges the traditional pipeline structure on the outside of the geomembrane and eliminates the traditional internal pipeline arrangement structure, so that the external pipeline structure can be used to cover the outside of the geomembrane for stable use of the geomembrane. At the same time, the external pipeline structure is less affected by the landfill, thereby increasing the service life of the entire pipeline structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 A top view of the biogas collection network of the present invention;

[0024] Figure 3 is a schematic diagram of the internal structure of the first connecting pipe of the present invention;

[0025] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0026] Figure 5 for Figure 3 A partial enlarged view of point B in the middle. DETAILED DESCRIPTION

[0027] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0028] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0029] In the description of the present invention, it is necessary to understand that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "center", "end", "length", "outer end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, in the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0031] Terms such as "upper", "above", "lower", "below", etc. used in the present invention to indicate spatial relative positions are used for the purpose of convenience to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. Terms of spatial relative position may be intended to include different orientations of the device in use or operation in addition to the orientation shown in the drawings. For example, if the device in the figure is turned over, the unit described as being "below" or "beneath" other units or features will be located "above" the other units or features. Therefore, the exemplary term "below" can encompass both the above and below orientations. The device may be oriented in other ways (rotated 90 degrees or other orientations), and the spatially related descriptors used herein interpreted accordingly.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "disposed", "socketed", "connected", "through", "plugged" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] like Figure 1-Figure 3 As shown, a landfill methane collection pipeline structure and methane collection method of the present invention include a landfill pile 8 buried in the landfill, a geomembrane 1 covering the landfill pile 8, and a methane collection net 3 covering the top of the geomembrane 1 to cover and press down the landfill pile 8;

[0034] The biogas collection net 3 is composed of an outer ring 31, a middle ring 32 and an inner ring 33. The outer ring 31, the middle ring 32 and the inner ring 33 are arranged from outside to inside and connected to each other by connecting pipes to form a hemispherical mesh structure covering the top of the landfill 8.

[0035] An elastic collecting pipe is arranged in each connecting pipe, and a bending convex portion is formed at the intersection of the middle ring 32 and the inner ring 33 of the connecting pipe, and the bending convex portion passes through the geomembrane 1 and extends into the landfill 8. An inflatable component is arranged on one side of the outer ring 31, and an inflatable cavity 38 is arranged in the outer ring 31. The inflatable cavity 38 is connected and communicated with each connecting pipe. The inflatable cavity 38 is inflated by the inflatable component so that the elastic collecting pipe 18 passes through the bending convex portion and is inserted into the landfill 8, and the elastic collecting pipe 18 is retracted into the connecting pipe by exhausting the gas in the connecting pipe;

[0036] A central tube 10 is provided at the top middle position of the inner ring 33. The central tube 10 is connected to each connecting tube via a hard fixed tube 36. The central tube 10 is connected to an external vacuum pump 9 via an exhaust pipe 5 to extract and collect the biogas in the landfill 8.

[0037] In this embodiment, the connecting tube includes a first connecting tube 37 and a second connecting tube 35. The length of the first connecting tube 37 is greater than that of the second connecting tube 35. The first connecting tube 37 connects the outer ring 31, the middle ring 32 and the inner ring 33 respectively. The second connecting tube 35 connects the outer ring 31 and the middle ring 32. The first connecting tube 37 forms a first bending protrusion 4 at the position of the inner ring 33. The first bending protrusion 4 passes through the inner ring 33 and is located at the lower end surface of the inner ring 33. The second connecting tube 35 forms a second bending protrusion 6 at the position of the middle ring. The second bending protrusion 6 passes through the middle ring 32 and is located at the lower end surface of the middle ring 32.

[0038] Among them, the elastic collecting tube 18 adopts a hollow elastic metal tube, and one or more collecting holes 17 are arranged on the upper end thereof. An active cavity 23 is arranged in the first connecting tube 37 and the second connecting tube 35. A sealing piston 16 is arranged near the outer ring 31 on the collecting tube 18, and the active cavity is sealed by the sealing piston 16. The active cavity 23 forms an arc-shaped transition cavity at the position of the bending convex portion. The elastic collecting tube passes through the arc-shaped transition cavity and extends to the outside. The first connecting tube 37 and the second connecting tube 35 are arranged as a gas-guiding docking structure inside the bending convex portion. When the sealing piston 16 moves to the position of the gas-guiding docking structure, the collecting tube is connected and conducted with the center tube through the gas-guiding docking structure.

[0039] like Figure 4 As shown, the gas-guiding docking structure includes a limit stop ring 19 arranged in the movable cavity. The limit stop ring 19 is hollow inside and is connected to the hollow cavity 22 arranged in the connecting pipe through the gas guide channel 21. The hollow cavity 22 is connected to the fixed tube 36. One or more gas-guiding pins 24 are arranged on the side of the limit stop ring 19 facing the sealing piston 16. A gas-guiding hole 162 is arranged on the sealing piston 16 at a position opposite to the gas-guiding pin 24. When the sealing piston 16 moves to the position of the limit stop ring, the gas-guiding pin 24 is inserted into the gas-guiding hole 162. The sealing piston 16 has a hollow gas-guiding cavity 161. The gas-guiding cavity 161 is connected to the hollow cavity 22 through the gas-guiding pin 24. The gas-guiding cavity 161 in the sealing piston 16 is connected to the collecting tube 18.

[0040] like Figure 5 As shown, a connecting spring 15 is fixedly arranged between the sealing piston 16 and the top surface of the active chamber 23 , one end of the connecting spring 15 is fixedly welded to the top surface of the active chamber 23 , and the other end is fixedly bonded to the sealing piston 16 .

[0041] Among them, the outer end of the gas guide hole 162 is in the shape of a trumpet opening, and a plurality of O-rings are provided on the inner wall of the gas guide hole 162. The trumpet opening structure allows the gas guide pin to be smoothly inserted into the gas guide hole 162, and the O-ring is used to achieve sealing after docking.

[0042] Among them, the inflation component includes an inflation tube 13 fixedly connected to the outer ring 31, one end of the inflation tube 13 is connected to the inflation extension tube 11, and a solenoid valve 12 is installed on the inflation extension tube 11. After the outer ring and the connecting tube are filled with air, the solenoid valve 12 is closed to prevent the air flow from flowing back. During inflation, the solenoid valve is manually controlled to open to achieve the purpose of inflation. The outside of the inflation extension tube is connected to the inflation pump 14, and the sealing piston is pushed by manually controlling the inflation pump to work and filling gas into each connecting tube.

[0043] During normal use, the entire biogas collection network covers the outside of the geomembrane and serves as a stable geomembrane, eliminating the need for other covering fixed structures. When biogas is extracted, an air pump is used to fill the gas into the outer ring, which then enters the connecting pipes from the outer ring, thereby pushing the sealing piston to move. The entire collection pipe is pushed out to the outside of the connecting pipe and then pushed out by the bent convex portion. At this time, the entire collection pipe is inserted into the landfill, and the air pump pushes the sealing piston to move to the limit stop ring, so that the air guide pin is inserted into the air guide jack to complete the air guide docking. At this time, the air pump is turned on to extract biogas from the landfill. After the extraction is completed, the solenoid valve is opened, and the collection pipe is reset by the spring. When not in use, the weight of the entire biogas collection network is used to stabilize the geomembrane.

[0044] The biogas collection method of the present invention specifically comprises the following steps:

[0045] Step 1: Lay a layer of geomembrane on the landfill, and set the arc size of the biogas collection net according to the width of the geomembrane;

[0046] Step 2: Pass the bent convex part of the connecting pipe through the geomembrane and extend it into the landfill;

[0047] Step 3: Use an air pump to inject gas to push out the elastic collection pipe, so that the collection pipe is completely inserted into the landfill;

[0048] Step 4: Turn on the vacuum pump and use the collection pipe to extract the biogas. The biogas enters the central pipe and is then discharged and collected from the central pipe.

[0049] The beneficial effect of the present invention is that the present invention arranges the traditional pipeline structure on the outside of the geomembrane and eliminates the traditional internal pipeline arrangement structure, so that the external pipeline structure can be used to cover the outside of the geomembrane for stable use of the geomembrane. At the same time, the external pipeline structure is less affected by the landfill, thereby increasing the service life of the entire pipeline structure.

[0050] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined in the claims.

Claims

1. A landfill methane collection pipeline structure, characterized by: A landfill pile buried in a landfill site, the landfill pile is covered with a geomembrane, and a methane collection net is covered on top of the geomembrane to cover and press down the landfill pile; The biogas collection net is composed of an outer ring, a middle ring and an inner ring, which are arranged from outside to inside and connected to each other by connecting pipes to form a hemispherical woven net structure covering the top of the landfill; An elastic collecting pipe is arranged in each connecting pipe, and a bending convex portion is formed at the intersection of the middle ring and the inner ring of the connecting pipe, and the bending convex portion passes through the geomembrane and extends into the landfill. An inflatable component is arranged on one side of the outer ring, and an inflatable cavity is arranged in the outer ring. The inflatable cavity is connected and communicated with each connecting pipe. The inflatable cavity is inflated by the inflatable component so that the elastic collecting pipe passes through the bending convex portion and is inserted into the landfill. The gas in the connecting pipe is discharged so that the elastic collecting pipe retracts into the connecting pipe. A central tube is arranged at the middle position of the top of the inner ring, and the central tube is connected to each connecting tube through a hard fixed tube, and the central tube is connected to an external suction pump through an exhaust pipe to extract and collect the biogas in the landfill; the connecting tubes include a first connecting tube and a second connecting tube, the length of the first connecting tube is greater than the length of the second connecting tube, the first connecting tube is respectively connected to the outer ring, the middle ring and the inner ring, the second connecting tube is connected to the outer ring and the middle ring, the first connecting tube forms a first bending convex portion at the position of the inner ring, the first bending convex portion passes through the inner ring and is located at the lower end surface of the inner ring, and the second connecting tube forms a second bending convex portion at the position of the middle ring The first connecting tube and the second connecting tube are both provided with an active cavity, and a sealing piston is provided at a position close to the outer ring on the collecting tube, and the active cavity is sealed by the sealing piston. The active cavity forms an arc-shaped transition cavity at the position of the bending convex portion, and the elastic collecting tube passes through the arc-shaped transition cavity and extends to the outside. The first connecting tube and the second connecting tube are provided with an air-guiding docking structure at the position of the bending convex portion. When the sealing piston moves to the air-guiding docking structure, the air-guiding docking structure is formed. When the sealing piston is in the position, the collecting tube is connected to the central tube through the gas-guiding docking structure; the gas-guiding docking structure includes a limit stop ring arranged in the movable cavity, the limit stop ring is hollow inside and is connected to the hollow cavity arranged in the connecting tube through the gas-guiding channel, the hollow cavity is connected to the fixed tube, one or more gas-guiding pins are arranged on the side of the limit stop ring opposite to the sealing piston, and a gas-guiding socket is arranged on the sealing piston at a position opposite to the gas-guiding pin. When the sealing piston moves to the position of the limit stop ring, the gas-guiding pin is inserted into the gas-guiding socket, and the sealing piston has a hollow gas-guiding cavity, which is connected to the hollow cavity through the gas-guiding pin. The air guide cavity in the sealing piston is connected and connected with the collecting tube; a connecting spring is fixedly arranged between the sealing piston and the top surface of the movable cavity, one end of the connecting spring is fixedly welded to the top surface of the movable cavity, and the other end is fixedly bonded to the sealing piston; the outer end of the air guide socket is in the shape of a trumpet opening, and a plurality of O-rings are arranged on the inner wall of the air guide socket; the inflation component includes an inflation tube fixedly connected to the outer ring, one end of the inflation tube is connected to the inflation extension tube, an electromagnetic valve is installed on the inflation extension tube, the outside of the inflation extension tube is connected to the inflation pump, and the sealing piston is pushed by manually controlling the inflation pump to work and filling gas into each connecting tube.

2. A method for collecting biogas based on the landfill biogas collection pipeline structure according to claim 1, characterized in that: The specific steps include: Step 1: Lay a layer of geomembrane on the landfill, and set the arc size of the biogas collection net according to the width of the geomembrane; Step 2: Pass the bent convex part of the connecting pipe through the geomembrane and extend it into the landfill; Step 3: Use an air pump to inject gas to push out the elastic collection pipe, so that the collection pipe is completely inserted into the landfill; Step 4: Turn on the vacuum pump and use the collection pipe to extract biogas. The biogas enters the central pipe and is then discharged and collected from the central pipe.

Images