Landfill gas collecting pipeline drainage system of refuse landfill

Abstract

The utility model provides a landfill gas collecting pipeline drainage system of a refuse landfill, and belongs to the technical field of landfill gas recycling. Comprising a garbage collecting tank, a gas pipeline, a combustion torch system and a drainage assembly. The garbage collecting tank and the combustion torch system are connected through a gas pipeline buried underground, the drainage assembly comprises an underground liquid accumulation tank and a drainage pump, the underground liquid accumulation tank is buried underground and located below the gas pipeline, and an inlet of the underground liquid accumulation tank is communicated with the lowest altitude point of the gas pipeline. The drainage pump is arranged in the underground liquid accumulation tank, a water inlet is communicated with the underground liquid accumulation tank, and a water outlet of the drainage pump is led to the outside from an outlet of the underground liquid accumulation tank. The problem of potential safety hazards caused by accumulated liquid clogging and unsmooth discharge due to pipeline structure defects in the landfill gas conveying process in the prior art can be solved.

Description

Technical Field

[0001] This utility model relates to the field of landfill gas recovery and utilization technology, and in particular to a landfill gas collection pipeline drainage system for landfills. Background Technology

[0002] Currently, over 90% of urban household waste in my country is disposed of through landfill. Anaerobic fermentation within the landfill produces large amounts of landfill gas, which contains 40%–60% CH4, 30%–50% CO2, and saturated water vapor (H2S), among other gases. Since methane in landfill gas is a high greenhouse gas but also has a certain calorific value, the best approach is to utilize it as a new energy source. This would not only reduce fossil fuel consumption but also decrease greenhouse gas emissions.

[0003] In related technologies, landfill gas generated from landfill waste is typically transported via pipelines to a biogas flare system as fuel. The flare system then handles combustion and exhaust gas treatment, converting greenhouse gases such as methane, which might otherwise escape into the atmosphere, into carbon dioxide and water vapor, effectively reducing greenhouse gas emissions. Simultaneously, the landfill gas is used as a heat source for efficient combustion, generating electricity from the combustion heat, thus achieving secondary utilization.

[0004] However, during the process of transporting landfill gas to the flare system through underground pipelines, the temperature difference between the gas and the inside and outside of the pipeline often causes some liquid to be generated inside the pipeline. This liquid accumulates in the lower sections of the pipeline due to the pipeline's slope, reducing the ventilation area in these sections and causing blockages. If the landfill gas cannot be discharged to the flare system in a timely and smooth manner, it will result in a large amount of landfill gas remaining in the landfill and pipelines, creating an explosion risk and safety hazard. Utility Model Content

[0005] This utility model provides a landfill gas collection pipeline drainage system, which can solve the problem of liquid accumulation and blockage caused by pipeline structural defects during landfill gas transportation, resulting in poor drainage and subsequent safety hazards in related technologies. The technical solution is as follows:

[0006] This utility model embodiment provides a landfill gas collection pipeline drainage system, including: a waste collection tank, a gas pipeline, a combustion flare system, and drainage components.

[0007] The waste collection trough and the combustion flare system are connected by a gas pipeline buried underground.

[0008] The drainage assembly includes an underground liquid collection tank and a drainage pump. The underground liquid collection tank is buried underground and located below the gas pipeline. The inlet of the underground liquid collection tank is connected to the lowest elevation point of the gas pipeline. The drainage pump is installed inside the underground liquid collection tank and its inlet is connected to the underground liquid collection tank. The outlet of the drainage pump is led out to the outside from the outlet of the underground liquid collection tank.

[0009] Optionally, a condensate separation pipe is provided between the gas pipeline and the underground liquid storage tank. The condensate separation pipe includes a main pipe and multiple branch pipes connected to the main pipe. The multiple branch pipes are connected to the condensate separation pipe, and the connection points are evenly spaced along the extension direction of the gas pipeline. The main pipe is connected to the inlet of the underground liquid storage tank.

[0010] Optionally, a level gauge is installed in the underground liquid storage tank. The level gauge is electrically connected to the drainage pump and is used to control the drainage pump to start when the liquid level in the underground liquid storage tank reaches a preset height.

[0011] Optionally, the drainage pump is a pneumatic drainage pump.

[0012] Optionally, it also includes an air compressor connected to the drain pump.

[0013] Optionally, it also includes an air storage tank, one end of which is connected to the air compressor and the other end of which is connected to the drain pump.

[0014] Optionally, it also includes a dehumidifier, which is disposed between the air tank and the connecting pipeline of the air compressor.

[0015] Optionally, the air compressor is connected to the combustion flare system.

[0016] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following:

[0017] The landfill gas collection pipeline drainage system provided in this embodiment of the invention utilizes an underground slurry tank additionally buried below the gas pipeline used to transport landfill gas, which connects the waste collection trough and the combustion flare system. This tank is connected to the lowest elevation point of the corresponding pipeline to collect slurry generated within the pipeline. Once a certain amount is collected, a drainage pump discharges the slurry from both inside and outside the system, achieving automated backflow drainage and preventing slurry accumulation within the gas pipeline from affecting the backflow transport of landfill gas. This effectively solves the problem of slurry blockage and poor drainage caused by pipeline structural defects during landfill gas transport, thus posing safety hazards in related technologies. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a landfill gas collection pipeline drainage system provided in an embodiment of this utility model;

[0020] Figure 2 This is a schematic diagram of another condensate separation pipe in the landfill gas collection pipeline drainage system provided in this embodiment of the utility model.

[0021] In the diagram: 1-Gas collection trough; 2-Gas pipeline; 3-Combustion flare system; 4-Drainage assembly; 5-Condensate separation pipeline; 11-Gas guide gabion; 41-Underground liquid collection tank; 42-Drainage pump; 43-Air compressor; 44-Gas storage tank; 45-Dryer / dehumidifier; 51-Main pipe; 52-Branch pipe; 411-Level gauge. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the structure of a landfill gas collection pipeline drainage system provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of another type of condensate separation pipe in the landfill gas collection and drainage system provided by this utility model embodiment. Figures 1 to 2 As shown, this utility model embodiment provides a landfill gas collection pipeline drainage system, including a waste collection tank 1, a gas pipeline 2, a combustion flare system 3, and a drainage component 4.

[0024] The waste collection trough 1 and the combustion flare system 3 are connected by a gas pipeline 2 buried underground. The drainage assembly 4 includes an underground slurry tank 41 and a drainage pump 42. The underground slurry tank 41 is buried underground and located below the gas pipeline 2, with its inlet connected to the lowest point of the gas pipeline 2. The drainage pump 42 is located inside the underground slurry tank 41, with its inlet connected to the tank, and its outlet leading to the outside from the outlet of the tank 41.

[0025] In this embodiment of the invention, the system is mainly applicable to the underground waste collection trough 1 in a landfill. The gas pipeline 2 for transporting landfill gas is entirely buried underground, with one end connected to a gas guide gabion 11 in the waste collection trough 1. The gas guide gabion 11 collects landfill gases such as methane and carbon dioxide generated from the waste in the waste collection trough 1, and transports these gases from the bottom. Finally, the gases are discharged into a combustion flare system 3 for ignition. The combustible components in the landfill gas, such as methane, are fully combusted. With the help of appropriate gas treatment devices for filtration, the gases are ultimately released into the atmosphere as harmless substances such as carbon dioxide and water vapor. The heat generated during combustion can also be collected for heating and power generation. When the landfill gas is transported in the gas pipeline 2, the resulting water first flows with the pipeline slope and collects at the lowest point of its burial elevation. At this point, the water is discharged through a pipeline located in this section to an underground liquid collection tank 41 buried deeper underground for collection. Once the liquid collected in the underground slurry tank 41 reaches a certain level, the drainage pump 42 can be started to discharge the liquid from the tank. The outlet of the drainage pump 42 can be directly led out to the underground soil through a pipe for discharge, or it can be further guided to the corresponding collection area for further collection and utilization.

[0026] The landfill gas collection pipeline drainage system provided in this embodiment of the invention utilizes an underground slurry tank 41 additionally buried below the gas pipeline 2 used to transport landfill gas, which connects the waste collection trough 1 and the combustion flare system 3. This tank is connected to the lowest elevation point of the gas pipeline 2 via a corresponding pipeline to collect slurry generated within the pipeline. Once a certain amount is collected, a drainage pump 42 discharges the slurry from both inside and outside the system, achieving automated backflow drainage and preventing slurry accumulation within the gas pipeline 2 from affecting the backflow transportation of landfill gas. This effectively solves the problem of slurry blockage and poor drainage caused by pipeline structural defects during landfill gas transportation, leading to safety hazards, in related technologies.

[0027] Optionally, a condensate separation pipe 5 is provided between the gas pipeline 2 and the underground condensate tank 41. The condensate separation pipe 5 includes a main pipe 51 and multiple branch pipes 52 connected to the main pipe 51. The multiple branch pipes 52 are connected to the condensate separation pipe 5, and the connection points are evenly spaced along the extension direction of the gas pipeline 2. The main pipe 51 is connected to the inlet of the underground condensate tank 41. Exemplarily, in this embodiment of the present invention, since the overall length of the gas pipeline 2 is often quite long, even if there are sections with relatively low altitudes, they still have a certain length. By using a condensate separation pipe 5 with multiple branch pipes 52, and utilizing the short-circuit connection between its multiple branch pipes 52 and the gas pipeline 2 at relatively low altitudes, the condensate within the entire section can be collected. Finally, the condensate is collected through the main pipe 51 and discharged into the underground condensate tank 41 for collection. This effectively improves the efficiency of condensate backflow collection and further ensures the smooth discharge and transportation of landfill gas.

[0028] Optionally, a level gauge 411 is installed inside the underground liquid storage tank 41. The level gauge 411 is electrically connected to the drainage pump 42 and is used to control the drainage pump 42 to start when the liquid level in the underground liquid storage tank 41 reaches a preset height. Exemplarily, in this embodiment of the present invention, a level gauge 411 is installed inside the underground liquid storage tank 41 to measure the liquid level inside the tank. By connecting to an external upper-level control device or by pre-stored control commands, the level gauge 411 controls the drainage pump 42 to start when it detects that the liquid level in the tank has reached a specified level, thus timely draining the liquid and achieving automated drainage, saving a significant amount of manpower and resources.

[0029] Optionally, the drainage pump 42 is a pneumatic drainage pump. For example, in this embodiment of the invention, because the landfill gas in the gas pipeline 2 contains a high concentration of methane, the methane content in the entire pipeline system, including the underground liquid storage tank 41, is relatively high. In this case, using a pneumatic drainage pump powered by compressed air to discharge the liquid from the tank eliminates the need for external energy sources such as electricity, effectively improving safety during operation.

[0030] Optionally, an air compressor 43 is also included, which is connected to the drain pump 42. Exemplarily, in this embodiment of the invention, the drain pump 42, which is a pneumatic drain pump, has an air compressor 43 on one side as a power source for supplying compressed air. Further, an air storage tank 44 and a dehumidifier 45 are also provided on the connecting pipeline between the air compressor 43 and the drain pump 42. One end of the air storage tank 44 is connected to the air compressor 43, and the other end is connected to the drain pump 42. The dehumidifier 45 is located between the air storage tank 44 and the connecting pipeline between the air compressor 43. The compressed air generated by the air compressor 43 first passes through the dehumidifier 45 for automatic temperature regulation and dehumidification to ensure that condensation does not occur during transportation in the underground pipeline, thus preventing pipeline blockage. Furthermore, when the drain pump 42 is not working, the pre-produced compressed air can be stored in the air storage tank 44 so that when it is needed to provide power to the drain pump 42, it can be provided in a timely manner by opening the valve on the connecting pipeline, avoiding frequent start-up and shutdown of units such as air compressor 43 and dehumidifier 45, and improving the overall practicality of the system.

[0031] Optionally, the air compressor 43 is connected to the combustion flare system 3. Exemplarily, in this embodiment of the invention, by electrically connecting to the combustion flare system 3, the air compressor 43 can be powered by the thermal energy generated by the combustion flare system 3, thereby enabling the entire drainage system to form an energy cycle, saving external energy supply, and further improving practicality.

[0032] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] The above description is only an optional embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A landfill gas collection and drainage system, characterized in that, include: The system includes a waste collection trough (1), gas pipes (2), a combustion flare system (3), and drainage components (4). The garbage collection tank (1) and the combustion torch system (3) are connected by a gas pipeline (2) buried underground; The drainage assembly (4) includes an underground liquid collection tank (41) and a drainage pump (42). The underground liquid collection tank (41) is buried underground and located below the gas pipeline (2). The inlet of the underground liquid collection tank (41) is connected to the lowest point of the gas pipeline (2). The drainage pump (42) is installed inside the underground liquid collection tank (41) and its inlet is connected to the underground liquid collection tank (41). The outlet of the drainage pump (42) is led out to the outside from the outlet of the underground liquid collection tank (41).

2. The landfill gas collection pipeline drainage system according to claim 1, characterized in that, A condensate separation pipe (5) is provided between the gas pipeline (2) and the underground liquid storage tank (41). The condensate separation pipe (5) includes a main pipe (51) and multiple branch pipes (52) connected to the main pipe (51). The multiple branch pipes (52) are connected to the condensate separation pipe (5), and the connection points are evenly spaced along the extension direction of the gas pipeline (2). The main pipe (51) is connected to the inlet of the underground liquid storage tank (41).

3. The landfill gas collection pipeline drainage system according to claim 1, characterized in that, The underground liquid storage tank (41) is equipped with a level gauge (411), which is electrically connected to the drainage pump (42) and is used to control the drainage pump (42) to start when the liquid level in the underground liquid storage tank (41) reaches a preset height.

4. The landfill gas collection pipeline drainage system according to claim 1, characterized in that, The drainage pump (42) is a pneumatic drainage pump.

5. The landfill gas collection pipeline drainage system according to claim 4, characterized in that, It also includes an air compressor (43) connected to the drain pump (42).

6. The landfill gas collection pipeline drainage system according to claim 5, characterized in that, It also includes an air storage tank (44), one end of which is connected to the air compressor (43) and the other end is connected to the drain pump (42).

7. The landfill gas collection pipeline drainage system according to claim 6, characterized in that, It also includes a dehumidifier (45), which is disposed between the air tank (44) and the air compressor (43) in the connecting pipeline.

8. The landfill gas collection pipeline drainage system according to claim 5, characterized in that, The air compressor (43) is connected to the combustion torch system (3).

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