CN219157775U

CN219157775U - Passive landfill gas guide and exhaust device

Info

Publication number: CN219157775U
Application number: CN202223451788.7U
Authority: CN
Inventors: 王立国; 王振; 周浩然; 赵燕锋
Original assignee: ZHEJIANG AIKELE ENVIRONMENTAL PROTECTION Ltd
Current assignee: ZHEJIANG AIKELE ENVIRONMENTAL PROTECTION Ltd
Priority date: 2022-12-23
Filing date: 2022-12-23
Publication date: 2023-06-09
Anticipated expiration: 2032-12-23

Abstract

The utility model discloses a passive landfill gas guide and exhaust device, which comprises a garbage pile body, wherein vertical round holes are drilled in the garbage pile body, clean gravel is filled in the vertical round holes, a gas-liquid suction and exhaust pipe is arranged in the middle of a gravel cylinder formed by the clean gravel, rammed clay, rammed bentonite and a covering film layer are sequentially arranged at the upper end of the gravel cylinder from bottom to top, the covering film layer is in airtight connection with the outer wall of the gas-liquid suction and exhaust pipe, a plurality of through holes for introducing gas and liquid are formed in the pipe wall at the middle lower part of the vertical section of the gas-liquid suction and exhaust pipe, the upper end of the gas-liquid suction and exhaust pipe is sequentially communicated with a fan through a landfill gas collecting well head arranged above the garbage pile body, a two-way valve and a gas-liquid separator is arranged on the gas-liquid suction and exhaust pipe between the fan and the two-way valve. The passive landfill gas guide and exhaust device can accelerate the extraction of gas and liquid in the garbage stack, effectively improve the gas guide and exhaust effect in the area, reduce the risk of forming a collapse area in the landfill operation period, and eliminate potential safety hazards.

Description

Passive landfill gas guide and exhaust device

Technical Field

The utility model relates to a passive landfill gas guide and exhaust device.

Background

In the prior art, gas generated in a household garbage pile is guided and discharged from the design rules of urban household garbage landfill technical requirement Specification (CJJ 17-2004) to household garbage sanitary landfill treatment technical Specification (GB 51220-2017), generally, a gas guide stone cage is adopted as a main facility for passive (sometimes active) gas guiding and discharging, the standard proposal spacing is 30m-50m, and in project implementation, the spacing is over 50m locally due to the influence of geology or environment, so that the congenital deficiency is formed, and in the logistic landfill operation, the overlapping elevation of the original gas guide stone cage is not standard, or is damaged by landfill machinery and garbage piles, so that regional guiding and discharging facilities are deficient, and the acquired hidden danger is formed. The formation of flammable and collapsed areas during landfill operation is a significant potential safety hazard for landfills. The western moat landfill is unsmooth in gas drainage, so that casualties and property loss caused by pile collapse are generated; the gas guide and discharge of the landfill body is not smooth, flammable gas is formed to be deposited, fire disasters in the storage area of the landfill are caused, great obstruction is formed for normal operation of the landfill, normal waste treatment flow of cities is influenced, and the normal operation of the cities is finally influenced.

The utility model patent application number 202210786726.7 discloses a transverse movement settlement-resistant connection structure of a vertical drainage well and a covering film of a refuse landfill, which comprises a refuse pile body 1, a vertical drainage well 5 (generally HDPE pipe) buried in the refuse pile body 1, a plurality of through holes 5-3 for air guiding and infiltration are arranged on a well wall of a lower vertical drainage well section 5-2 in the refuse pile body 1, a stone-dragon wire netting 11 is arranged on the periphery of the lower vertical drainage well section 5-2, broken stone 12 is filled in a region between the stone-dragon wire netting 11 and the lower vertical drainage well section 5-2, the vertical drainage well 5 sequentially passes through a clay layer 2, the geotechnical cloth layer 3 and the covering film layer 4 to expose the upper vertical drainage well section 5-1 to the atmosphere, a buried gas collecting pipe 7 and an infiltration liquid drainage pipe 15 are arranged on a flange blind plate 6 at the upper port of the vertical drainage well 5, a sewage pump 14 is arranged at the lower end of the infiltration liquid drainage pipe 15, and the buried gas enters a landfill gas collecting pipe device through the buried gas collecting pipe 7; the percolate enters the percolate treatment device via a percolate suction pipe 15. According to the technical scheme, in order to prevent the covering film caused by the settlement and the transverse movement of the garbage stack body from being stretched and torn at the joint of the covering film and the vertical drainage gas-guide well, the covering film layer 4 is connected with the upper section 5-1 of the vertical drainage gas-guide well through the elastic connector 8, and the elastic connector 8 comprises a longitudinal elastic connector 8-1 and a transverse elastic connector 8-2. It still presents a safety hazard in creating a collapsed region during landfill operations.

Disclosure of Invention

The utility model aims to provide a passive landfill gas guide and exhaust device which is low in construction cost, can accelerate the extraction of gas and liquid in a garbage pile, effectively improves the gas guide and exhaust effect in a region, reduces the risk of forming a collapse region in a landfill operation period, and eliminates potential safety hazards.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a passive landfill gas guide and exhaust device, includes the rubbish heap body, drills the vertical round hole that is diameter D in the rubbish heap body, vertical round hole intussuseption is filled with clean gravel, and the middle part of the gravel cylinder that comprises clean gravel is equipped with the gas-liquid and inhales the calandria, and the upper end of gravel cylinder is equipped with tamp clay, tamp bentonite and cover rete from bottom to top in proper order, covers between rete and the gas-liquid and inhales the calandria outer wall airtight connection, be equipped with a plurality of through-holes that are used for leading in gas and liquid on the well wall of the well lower part of the vertical section of gas-liquid and inhale the calandria, the upper end that the gas-liquid inhale the calandria loops through the landfill gas collection well head that sets up above the rubbish heap body, two-way valve and fan intercommunication, is equipped with the gas-liquid separator on the gas-liquid inhale the calandria between fan and two-way valve.

The diameter D of the vertical round hole is 300-800mm.

The gas-liquid absorbing and discharging pipe is made of HDPE material, and the diameter is 90-160mm.

The vertical section of the gas-liquid suction and discharge pipe is 300mm downwards from the upper end of the gravel cylinder, and the pipe wall below the vertical section is provided with a through hole.

Compared with the prior art, the utility model has the beneficial effects that: by adopting the technical scheme, a thick and long vertical seepage drainage gas guide well is omitted, a landfill gas collecting pipe and a percolate pumping and draining pipe are combined into a whole, under the pumping action of the fan, the periphery of the gas-liquid pumping and draining pipe provided with a through hole can form preset negative pressure, gas fluidity is formed by utilizing gas pressure difference, the gas pressure in a garbage stack body enters the gas-liquid pumping and draining pipe through clean gravels with high permeability coefficient, the increase of the gas pressure difference realizes the leap of gas collection and draining quality, the structure adopts cheap bentonite and clay (comprehensively considering cost and implementation requirements) to form a closed space, the pumping and draining effect is better, the clay and the gas-liquid pumping and draining pipe are firstly used for bonding to form a first plugging layer, and then the bentonite with better performance is used for secondary plugging, so that the sealing requirement can be well met;

the vertical round hole can adopt a mature mechanical drilling technology, and after mechanical hole forming, a complete set of passive landfill gas guide and exhaust device is formed by a structure in the garbage pile body, a landfill gas collecting well head, a gas-liquid separator and a fan through a gravel cylinder formed by a lower gas-liquid suction and exhaust pipe and clean gravel. And under the action of a fan, negative pressure of a gas-liquid suction and discharge pipe is formed, and gas and liquid separation is carried out after gas and gas-liquid mixture in the garbage stack body are adsorbed and discharged out of the garbage stack body. The construction cost is lower, and through implementation, the gas guiding and exhausting effect in the area can be effectively improved. Taking the engineering of a mojia field as an example, according to the original implementation plan, the detection of gas can be achieved only by 5-8 years, through the implementation of the technology, the safety state can be achieved in 2-4 years in general, and meanwhile, taking the landfill of domestic garbage as an example, the technology is implemented, the gas amount is 3-5 times that of the original technology, the technology can be used for biogas power generation, meanwhile, the gas in a warehouse area does not overflow greatly, the safety of staff in the landfill warehouse area is guaranteed, and economic benefits are created. Because negative pressure suction is adopted, gas and liquid in the garbage stack body can be pumped out in an accelerating way, the risk of forming a collapse area in the landfill operation period is reduced, and potential safety hazards are eliminated. Due to low manufacturing cost, the passive landfill gas guide and discharge device can be arranged at intervals not more than 20m, so that landfill gas and liquid in the garbage stack can be more effectively discharged, and the risk is further reduced.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

fig. 2 is an enlarged view of the lower end portion of the gas-liquid suction and discharge pipe in fig. 1.

Detailed Description

In order to make the technical scheme of the present utility model clearer, the present utility model will be described in detail with reference to fig. 1 and 2. It should be understood that the detailed description and specific examples, while indicating the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model.

The utility model relates to a passive landfill gas guide and exhaust device, which comprises a garbage pile body 0, wherein a vertical round hole with the diameter of D is drilled in the garbage pile body 0, clean gravel is filled in the vertical round hole, a gas-liquid suction and exhaust pipe 2 is arranged in the middle of a gravel cylinder 3 formed by the clean gravel, rammed clay 4 (used for sealing an upper channel of the gravel cylinder 3), rammed bentonite 5 (used for strengthening the upper channel of the gravel cylinder 3 and forming a surface layer sealing layer of the garbage pile body 0) and a covering membrane layer 6 are sequentially arranged at the upper end of the gravel cylinder 3 from bottom to top, the covering membrane layer 6 is in airtight connection with the outer wall of the gas-liquid suction and exhaust pipe 2, a plurality of through holes 2-1 used for introducing gas and liquid are formed in the middle lower pipe wall of the vertical section of the gas-liquid suction and exhaust pipe 2, a gas-liquid separator 9 is arranged on the gas-liquid suction and exhaust pipe 2, and the gas-liquid suction and exhaust pipe 2 is sequentially communicated with a fan 8 through a landfill gas collecting well head 7 arranged above the garbage pile body 0, a double-way valve 10, and a gas-liquid suction and exhaust pipe 2 between the fan 8 and the double-way valve 10.

Preferably, the diameter D of the vertical round hole is 300-800mm. The gas-liquid suction and exhaust pipe 2 is made of HDPE material and has the diameter of 90-160mm. The vertical section of the gas-liquid suction and discharge pipe 2 is provided with a through hole 2-1 from the upper end of the gravel cylinder 3 to the pipe wall below 300mm (i.e. below the dividing line 2-2 in fig. 1), the through hole 2-1 is preferably a quincuncial opening, and the diameter of the quincuncial opening is 10-15mm so as to ensure that gas and liquid smoothly enter the pipeline.

The general condition of the garbage stack body 0 is not less than 7.5m, clay 4 with the thickness not less than 300mm is adopted for one-step blocking, bentonite 5 with the thickness not less than 900mm is adopted for secondary blocking, then a covering film layer 6 is adopted for blocking, welding is carried out between the covering film layer 6 and the gas-liquid suction and discharge pipe 2, and the sealing performance of the stack body is improved. The lower end of the gas-liquid suction and discharge pipe 2 is not less than 300mm away from the bottom of the gravel cylinder 3.

The landfill gas collecting well head 7 adopted by the application is a finished product which is adaptive to a pipeline; the two-way valve 10 is a finished product; the fan 8 used in the application is a finished product, the working time is arranged according to the on-site air quantity, and the working time is generally 4-6 hours per day; the gas-liquid separator 9 is the finished product in this application.

The gas-liquid separator 9 separates landfill gas and liquid, which are respectively and correspondingly treated by the prior art.

The technical scheme can be used in landfill sealing, can also be used in a landfill reservoir area of normal operation, can be lifted along with garbage pile body lifting, is a technology with strong applicability, and mainly adopts time-division operation according to project actual conditions to ensure economical efficiency.

Claims

1. The utility model provides a passive landfill gas guide device, includes rubbish heap body (0), bores in rubbish heap body (0) and is equipped with the vertical round hole that the diameter is D, vertical round hole intussuseption is filled with clean gravel, its characterized in that: the middle part of gravel cylinder (3) that constitutes by clean gravel is equipped with gas-liquid and inhales calandria (2), and the upper end of gravel cylinder (3) is equipped with tamp clay (4), tamp bentonite (5) and cover rete (6) from bottom to top in proper order, and airtight connection is between covering rete (6) and gas-liquid and inhale calandria (2) outer wall, be equipped with a plurality of through-holes (2-1) that are used for leading-in gas and liquid on the well wall of the well lower part of the vertical section of gas-liquid and inhale calandria (2), the upper end of gas-liquid inhale calandria (2) is through landfill gas collection well head (7), two-way valve (10) and fan (8) intercommunication in proper order above rubbish heap body (0), is equipped with gas-liquid separator (9) on gas-liquid and inhale calandria (2) between fan (8) and two-way valve (10).

2. The passive landfill gas guiding and exhausting device according to claim 1, wherein: the diameter D of the vertical round hole is 300-800mm.

3. The passive landfill gas guiding and exhausting device according to claim 1, wherein: the gas-liquid suction and exhaust pipe (2) is made of HDPE material, and the diameter is 90-160mm.

4. The passive landfill gas guiding and exhausting device according to claim 1, wherein: the vertical section of the gas-liquid suction and discharge pipe (2) is 300mm downwards from the upper end of the gravel cylinder (3), and the pipe wall below the vertical section is provided with a through hole (2-1).