CN112871946B

CN112871946B - Gas discharge structure of sealed well type refuse landfill

Info

Publication number: CN112871946B
Application number: CN202110225973.5A
Authority: CN
Inventors: 朱仁俊
Original assignee: Nanjing Yuzhi Intelligent Technology Co Ltd
Current assignee: Nanjing Yuzhi Intelligent Technology Co Ltd
Priority date: 2021-03-01
Filing date: 2021-03-01
Publication date: 2022-08-16
Anticipated expiration: 2041-03-01
Also published as: CN112871946A

Abstract

The invention provides a gas discharge structure of a sealed well type refuse field landfill, which comprises a plurality of well type landfill piles, wherein the cross sections of the well type landfill piles are rectangular, a plurality of gas-liquid outlet ports are uniformly arranged on the inner wall of each well type landfill pile at intervals from top to bottom, the gas-liquid outlet ports are communicated through a separation channel vertically arranged in the side wall of the well type landfill pile, a plurality of sealing sector plates are movably arranged in the gas-liquid outlet ports through rotating shafts, and extrusion springs are fixedly arranged on one side of the separation channel of each sealing sector plate. The quality conditions of underground water and air around the refuse landfill site are greatly improved.

Description

Gas discharge structure of sealed well type refuse landfill

Technical Field

The invention relates to the technical field of refuse landfill structures, in particular to a sealed well type refuse landfill gas discharge structure.

Background

The landfill site is a centralized garbage stacking site in a sanitary landfill mode, the sanitary landfill site is widely applied in China due to low cost and good sanitation degree, the problems of leachate treatment and waste gas recovery in the construction of the landfill site are the key for determining the technical success of the landfill site, and the problems are directly related to the pollution degree of the landfill site to underground water and air environment, so that the problem that the leachate and waste gas generated by anaerobic decomposition are currently seriously solved is solved;

a landfill site which can prevent landfill gas from leaking by using a waterproof pad, which is applied under the application number of 'CN 200710167987.6' in the prior art, comprises at least one layer of landfill layer, the size of which is gradually reduced upwards layer by layer, and a covering soil layer is formed on the landfill layer; the dike part is arranged at the edge of the refuse landfill layer and is used for providing refuse landfill space; an inner road formed inside the embankment and used for dividing landfill areas of garbage on each layer; a V-shaped sandy soil side ditch formed at a boundary part of the embankment part and the overburden layer and used for draining rainwater; the leaching water vertical discharge well is used for conveying leaching water generated in the garbage burying layer to a leaching water treatment station and comprises a perforated pipe and a foundation for supporting, wherein the perforated pipe is used for collecting the leaching water; the landfill gas collecting well is used for conveying landfill gas to landfill gas treatment equipment and comprises a guide wall, a perforated pipe, a landfill gas conveying pipeline connected with the perforated pipe and a supporting foundation formed around the guide wall exposed to the outside; and a waterproof pad formed on a cracked portion of the soil cover layer formed on the landfill layer.

But the vertical circulating landfill structure of the household garbage still has obvious defects in the using process: 1. the landfill site adopts a traditional open type open-air layered soil covering landfill mode to treat the garbage, although the open type layered soil covering landfill mode has lower cost, the covered soil cannot be completely compacted through a mechanical rolling mode, so that the overflow of landfill gas cannot be prevented, and as the landfill gas contains about 50% of methane, 50% of carbon dioxide and a small amount of nitrogen and oxygen, if the air circulation is poor, the combustible gas is easy to explode after being gathered, and meanwhile, the overflowed malodorous gas easily influences the living environment through air flow; 2. traditional open-air layering earthing landfill factory can only set up sporadic gaseous mouth that overflows after the landfill is accomplished, and this kind of waste gas spills the mode and will lead to local gaseous excessive and loose inadequately, and then leads to gaseous regional discharge from the gas spills mouthful accident that looses to cause the influence to the environment.

Disclosure of Invention

The invention aims to provide a sealed well type landfill gas discharge structure to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a gas discharge structure of a sealed well type refuse field landfill comprises a plurality of well type landfill piles, wherein the cross sections of the well type landfill piles are rectangular, the well type landfill piles are arranged in an array mode, a plurality of gas-liquid guide outlets are uniformly arranged on the inner wall of each well type landfill pile at intervals from top to bottom, the gas-liquid guide outlets are communicated through separation channels vertically arranged inside the side wall of the well type landfill pile, the bottom ends of the separation channels are communicated with a percolate collecting pool, and the upper ends of the separation channels are communicated with a plurality of total gas collecting pipes through pipelines;

a plurality of there is sealed sector plate through pivot movable mounting in the gas-liquid derivation mouth, fixed mounting has the grid filter screen on the sealed sector plate, the grid filter screen is through the inside passageway and the gas-liquid discharge gate intercommunication of seting up of sealed sector plate, sealed sector plate is located separation passageway one side fixed mounting and has the extrusion spring, the extrusion spring is kept away from sealed sector plate one end fixed connection at the separation passageway lateral wall, the fixed closed rubber pad that is provided with of gas-liquid derivation mouth of sealed sector plate bottom.

Preferably, a top closing cover is arranged above the well type landfill pile.

Preferably, a plurality of the total gas collecting pipes are provided with a closing cover or a gas recycling pipe in a threaded mode.

Preferably, a leachate recovery pipe is arranged in the leachate collection pool, and one end, far away from the leachate collection pool, of the leachate recovery pipe extends to the ground.

Preferably, the percolate recovery pipe extends to the ground and is communicated with the percolate collecting tank at one end.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, through the arrangement of the well type landfill pile, compared with an open type open-air layered soil covering and burying mode, the overflow and dispersion conditions of waste gas are easier to control, and the influence of the landfill pile on the surrounding ecological environment is effectively reduced;

2. the invention ensures that the garbage in different height areas in the same well type landfill pile can recover the fermentation waste and the percolate through the arrangement of the gas-liquid guide outlets, so that the percolate and the waste gas are more uniformly dispersed, the centralized collection and treatment are convenient, the influence of the percolate and the waste gas on the ecological environment is effectively prevented, and the quality conditions of underground water and air around the landfill site selection are greatly improved.

According to the invention, through the arrangement of the well type landfill piles, compared with an open type open-air layered soil covering and landfill mode, the overflow and dispersion conditions of waste gas are easier to control, and the garbage in areas with different heights in the same well type landfill pile can be recycled, so that the leachate and the waste gas are more uniformly dispersed, the centralized collection and treatment are facilitated, and the quality conditions of underground water and air around the selected site of the garbage landfill are greatly improved.

Drawings

FIG. 1 is a perspective view of the overall structure of the present invention;

FIG. 2 is a perspective view of the seal segment plate mounting structure of the present invention;

FIG. 3 is an enlarged view of the area A of the present invention;

FIG. 4 is a schematic top view of a well landfill of the present invention;

FIG. 5 is a schematic view of the connection structure of the percolate recovery tube according to the present invention.

In the figure: 1 well type landfill heap, 2 gas-liquid leading-out ports, 3 separation channels, 4 percolate collecting pools, 5 total gas collecting pipes, 6 sealing sector plates, 7 grating filter screens, 8 gas-liquid discharging ports, 9 extrusion springs, 10 sealing rubber pads, 11 top sealing covers, 12 sealing covers, 13 gas recovery pipes, 14 percolate recovery pipes and 15 percolate collecting pools.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Example (b):

referring to fig. 1-5, the present invention provides a technical solution:

a kind of closed well type refuse field landfill gas discharge structure, including several well type landfill piles 1, the cross section of the well type landfill pile 1 is rectangular, several well type landfill piles 1 are arranged in array, every well type landfill pile 1 inner wall is from last to interval have several gas-liquid lead-out ports 2 evenly, the gas-liquid lead-out port 2 is through setting up in the separation channel 3 inside the sidewall of the well type landfill pile 1 vertically, the bottom end of the separation channel 3 communicates with collecting pool 4 of percolate, the upper end of the separation channel 3 communicates with several total gas collecting pipes 5 through the pipeline;

the vertical layered soil covering landfill garbage is arranged in the well type landfill pile 1, the garbage sent into the well type landfill pile 1 is compacted through a compactor, compared with a mechanical rolling mode, the garbage amount capable of being contained in a unit volume is larger, the layered soil covering landfill mode is adopted, the landfill garbage of each level is separated through soil and plastic gaskets, the number of the landfill layers of the garbage is consistent with the number of the gas-liquid leading-out ports 2, and the isolating layer is located below the gas-liquid leading-out ports 2, so that landfill gas and leachate generated by the landfill garbage of each level can be discharged through the gas-liquid leading-out ports 2, the gas-liquid leading-out ports 2 are communicated with the separation channels 3, the gas is upwards collected through the main gas collecting pipes 5 through the separation channels 3, and the liquid is downwards collected through the leachate collecting pond 4 through the separation channels 3;

a sealing sector plate 6 is movably arranged in the gas-liquid guide outlets 2 through a rotating shaft, a grating filter screen 7 is fixedly arranged on the sealing sector plate 6, the grating filter screen 7 is communicated with a gas-liquid discharge port 8 through a channel formed in the sealing sector plate 6, an extrusion spring 9 is fixedly arranged on one side, located on the separation channel 3, of the sealing sector plate 6, one end, far away from the sealing sector plate 6, of the extrusion spring 9 is fixedly connected to the side wall of the separation channel 3, and a sealing rubber gasket 10 is fixedly arranged at the gas-liquid guide outlet 2 at the bottom of the sealing sector plate 6.

When no external force is applied, the sealing sector plate 6 deflects to the side far away from the separation channel 3 under the action of the extrusion spring 9, and at the moment, the gas-liquid discharge port 8 is contacted with the sealing rubber gasket 10 to seal, the design significance lies in preventing gas leakage in the well type landfill 1 in the non-landfill area, gas generated in bottom landfill can only enter the main gas collecting pipe 5 through the separation channel 3 to be discharged, the risk of explosion caused by methane gas accumulation in the well type landfill 1 is prevented, meanwhile, if landfill gas enters the well type landfill 1 which is a landfill layer, gas can be directly discharged into air from the well type landfill 1 in the next landfill, the significance of the main gas collecting pipe 5 is greatly reduced, and the garbage extrudes the sealing sector plate 6 to the side of the separation channel 3 when the landfill garbage enters the well type landfill 1 to be compacted, so that the gas-liquid discharge port 8 is separated from the closed rubber gasket 10, and the gas-liquid guide outlet 2 of the corresponding landfill area is automatically opened;

preferably, a top closing cover 11 is arranged above the shaft type landfill piles 1, and after the shaft type landfill piles 1 are filled, the top is closed through the top closing cover 11, so that landfill gas is effectively prevented from overflowing.

Preferably, the plurality of total gas collecting pipes 5 are provided with the closing caps 12 or the gas recycling pipes 13 by screw threads, any total gas collecting pipe 5 can recycle the gas in the whole separation channel 3 due to the mutual communication of the total gas collecting pipes 5, the corresponding total gas collecting pipe 5 can be closed by the closing caps 12 according to the needs in the use process, the landfill gas is recycled by arranging the gas recycling pipes 13 on the remaining closed total gas collecting pipes 5, and the recycled landfill gas can be purified and applied to the field of energy combustion.

Preferably, a leachate recycling pipe 14 is arranged in the leachate collecting tank 4, one end of the leachate recycling pipe 14, which is far away from the leachate collecting tank 4, extends to the ground, and leachate collected at the bottom of the leachate collecting tank 4 is discharged into the leachate collecting tank 15 through the leachate recycling pipe 14, so that the leachate is prevented from polluting groundwater.

The using method comprises the following steps:

the method comprises the following steps: dumping the garbage into a well type landfill pile 1 in sequence, and compacting by a tamper to ensure that the height of the garbage buried in each layer does not exceed the gas-liquid outlet 2 of the upper stage;

step two: after the garbage is tamped, covering soil on the garbage, tamping again, laying a layer of plastic liner on the tamped soil, and ensuring that the plastic liner is flush with the lower edge of the gas-liquid outlet 2 so that landfill gas and percolate generated by the upper layer of landfill garbage can be discharged through the gas-liquid outlet 2;

step three: after each layer of landfill is finished, the well type landfill piles 1 for landfill are sealed through the top sealing covers 11, leachate and landfill gas generated by landfill garbage are collected through the leachate recovery pipes 14 and the total gas collecting pipes 5 regularly, and after all the units formed by the well type landfill piles 1 are completely buried, green planting can be carried out above the units, so that damage to the ecological environment caused by the landfill site is reduced.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a canned type well formula landfill gas discharge structure, includes a plurality of well formula landfill heap (1), its characterized in that: the cross section of the well type landfill pile (1) is rectangular, a plurality of well type landfill piles (1) are arranged in an array mode, a plurality of gas-liquid leading-out ports (2) are uniformly arranged on the inner wall of each well type landfill pile (1) at intervals from top to bottom, the gas-liquid leading-out ports (2) are communicated through separation channels (3) vertically arranged inside the side wall of the well type landfill pile (1), the bottom ends of the separation channels (3) are communicated with a percolate collecting pool (4), and the upper ends of the separation channels (3) are communicated with a plurality of total gas collecting pipes (5) through pipelines;

a plurality of there are sealed sector plate (6) through pivot movable mounting in gas-liquid delivery port (2), fixed mounting has grid filter screen (7) on sealed sector plate (6), grid filter screen (7) are through sealed sector plate (6) inside passageway and gas-liquid discharge gate (8) intercommunication of seting up, sealed sector plate (6) are located separation passageway (3) one side fixed mounting and have extrusion spring (9), extrusion spring (9) are kept away from sealed sector plate (6) one end fixed connection at separation passageway (3) lateral wall, gas-liquid delivery port (2) of sealed sector plate (6) bottom are fixed and are provided with sealed rubber pad (10).

2. The sealed type shaft type refuse dump landfill gas exhaust structure according to claim 1, wherein: a top closing cover (11) is arranged above the well type landfill pile (1).

3. The sealed type shaft type refuse dump landfill gas exhaust structure according to claim 1, wherein: and a sealing cover (12) or a gas recovery pipe (13) is arranged on the plurality of the main gas collecting pipes (5) in a threaded manner.

4. The sealed type well type refuse dump landfill gas exhaust structure according to claim 1, wherein: a leachate recovery pipe (14) is arranged in the leachate collecting pool (4), and one end, far away from the leachate collecting pool (4), of the leachate recovery pipe (14) extends to the ground.

5. The sealed type shaft type refuse dump landfill gas exhaust structure as defined in claim 4, wherein: the percolate recovery pipe (14) extends to the ground, and one end of the percolate recovery pipe is communicated with the percolate collecting tank (15).