Mixed landfill gas and perishable garbage biogas power generation system

Abstract

The utility model discloses a mixed landfill gas and perishable garbage biogas power generation system, which is characterized in that low-concentration landfill gas with methane content of less than 40% from a landfill gas conveying pipeline is conveyed to a gas inlet pipeline through a booster fan; perishable garbage biogas with the methane content not less than 50% from the perishable garbage biogas conveying pipeline is treated by the purification equipment, then is conveyed to the gas inlet pipeline, is mixed with landfill gas, is conveyed to the gas storage cabinet, and is proportionally mixed by the constant-pressure control device to form high-concentration biogas with the methane content higher than 40%; high-concentration biogas is introduced into the biogas pretreatment system through the gas outlet pipeline for pretreatment and purification and then supplied to the biogas generator set. The landfill gas and perishable garbage biogas are mixed to form high-calorific-value biogas, the high-calorific-value biogas is supplied to the biogas generator set for continuous power generation, the power generation efficiency is improved, and the environmental influence caused by disordered dissipation and waste of the landfill gas with too low concentration is avoided.

Description

Technical Field

[0001] This utility model relates to the field of biogas power generation technology, and more specifically, to a biogas power generation system that combines landfill gas and biodegradable waste. Background Technology

[0002] Currently, the biogas from the landfill is entering its depletion phase, with the methane concentration gradually decreasing. The methane concentration entering the generator units has dropped from around 45% to around 30%. When the methane concentration falls to the critical value of around 35%, the generator units will be unable to start normally. Such excessively low concentrations of landfill gas, if not utilized and consumed, will cause disorderly dispersion and waste, severely impacting the surrounding environment. While the biogas concentration from the food waste generation project is above 55%, the sulfur dioxide concentration is also too high; directly using it for power generation would result in energy waste. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies by providing a mixed landfill gas and biogas power generation system. By mixing landfill gas and biogas from easily degradable waste to form high-calorific-value biogas, it solves both the problem of excessively high biogas concentration in kitchen waste projects and the problem of unusable landfill gas concentration. This system supplies biogas generators with the gas to continue generating electricity, thereby improving power generation efficiency and avoiding the environmental impact caused by the disorderly dispersion and waste of excessively low-concentration landfill gas.

[0004] The present invention solves the above-mentioned technical problems through the following technical solutions.

[0005] The mixed landfill gas and biogas power generation system includes an intake pipe, a booster fan, purification equipment, a gas storage tank, an outlet pipe, a biogas pretreatment system, a biogas generator set, a landfill gas delivery pipe, and a biogas delivery pipe for biogas from biogas. Low-concentration landfill gas with a methane content of less than 40% from the landfill gas delivery pipe is sent to the intake pipe via the booster fan. Biogas from biogas from biogas delivery pipe with a methane content of not less than 50% is treated by the purification equipment and then sent to the intake pipe to mix with the landfill gas. The mixture is then sent to the gas storage tank and mixed proportionally by a constant pressure control device to form high-concentration biogas with a methane content of more than 40%. The high-concentration biogas is introduced into the biogas pretreatment system through the outlet pipe for pretreatment and purification before being supplied to the biogas generator set.

[0006] Preferably, the biogas pretreatment system includes a biogas dehydration device, a booster fan, an air-cooled radiator, and a precision filter.

[0007] Preferably, the precision filter includes a primary filter with a particle size of 10 μm and a secondary filter with a particle size of 3 μm.

[0008] Preferably, the output pipeline of the biogas pretreatment system is equipped with a pipeline pressure gauge, an output pipeline gas flow meter, an output pipeline methane concentration sensor, an output pipeline temperature sensor, an output pipeline pneumatic shut-off valve, a manual air inlet valve, and a flame arrester.

[0009] Preferably, an outlet pressure gauge is installed on the outlet pipe.

[0010] Preferably, the biogas generator set includes a generator and a biogas internal combustion engine that are coupled together.

[0011] As a preferred option, an oxygen sensor is installed on the exhaust pipe of the biogas generator set.

[0012] Preferably, a Roots blower, a PSA decarbonization device, and a product gas buffer tank are sequentially connected between the biogas pretreatment system and the biogas generator set.

[0013] As a preferred option, high-concentration biogas with a methane content higher than 40% is pressurized by a Roots blower and then partially decarbonized by a PSA decarbonization device to obtain high-calorific-value biogas with a methane content higher than 50%. After being buffered by a product gas buffer tank, it is supplied to the biogas generator set.

[0014] The beneficial effects of this utility model are:

[0015] 1. Low-concentration landfill gas is extracted from the landfill using a blower and mixed with biogas from easily perishable waste in a gas storage tank. After mixing to a certain ratio (expected concentration of 40%-45%), the mixture is extracted from the gas tank using a pretreatment booster blower. The mixture undergoes filtration, dehumidification, and desulfurization in pretreatment equipment before being sent to a generator set for power generation. This method effectively utilizes the low-concentration landfill gas, avoiding the environmental impact caused by its disorderly dispersion and waste. It also solves the problem of excessively high biogas concentrations generated in food waste projects. By addressing the depletion phase of biogas in the landfill area, this method achieves efficient energy utilization, promoting energy conservation and environmental protection. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings required in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the system structure according to an embodiment of this application;

[0018] In the diagram: 1-Intake pipe, 2-Booster fan, 3-Purification equipment, 4-Gas storage tank, 5-Output pipe, 6-Biogas pretreatment system, 7-Biogas generator set, 8-Landfill gas transmission pipe, 9-Perishable waste biogas transmission pipe, 10-Constant pressure control device. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model have been clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0021] like Figure 1 As shown, the mixed landfill gas and biogas power generation system of this utility model embodiment includes an intake pipe 1, a booster fan 2, a purification device 3, a gas storage tank 4, an outlet pipe 5, a biogas pretreatment system 6, a biogas generator set 7, a landfill gas delivery pipe 8, and a biogas delivery pipe 9. The biogas pretreatment system 6 includes a biogas dehydration device, a booster fan, an air-cooled radiator, and a precision filter. The precision filter includes a primary filter with a 10μm particle size and a secondary filter with a 3μm particle size. The output pipe of the biogas pretreatment system 6 is equipped with a pipe pressure gauge, an output pipe gas flow meter, an output pipe methane concentration sensor, an output pipe temperature sensor, an output pipe pneumatic shut-off valve, a manual intake valve, and a flame arrester. The biogas generator set 7 includes a generator and a biogas internal combustion engine coupled together. An oxygen sensor is installed on the exhaust pipe of the biogas generator set 7.

[0022] Low-concentration landfill gas with a methane content of less than 40% from landfill gas transmission pipeline 8 is sent to inlet pipeline 1 via booster fan 2. Biogas from perishable waste biogas transmission pipeline 9 with a methane content of not less than 50% is treated by purification equipment 3 and then sent to inlet pipeline 1 to mix with landfill gas before being fed into gas storage tank 4. After being mixed proportionally by constant pressure control device 10, high-concentration biogas with a methane content higher than 40% is formed. This high-concentration biogas is introduced into biogas pretreatment system 6 via outlet pipeline 5 for pretreatment and purification before being supplied to biogas generator set 7. An outlet pressure gauge is installed on outlet pipeline 5.

[0023] Furthermore, a Roots blower, a PSA decarbonization unit, and a product gas buffer tank are sequentially connected between the biogas pretreatment system 6 and the biogas generator set 7. High-concentration biogas with a methane content exceeding 40% is pressurized by the Roots blower and then passes through the PSA decarbonization unit to remove some carbon dioxide, obtaining high-calorific-value biogas with a methane content exceeding 50%. This biogas is then buffered by the product gas buffer tank before being supplied to the biogas generator set 7. This helps improve power generation efficiency, reduce damage to equipment from harmful gases, and extend the service life of the generator set. Carbon dioxide and other impurities adsorbed by the adsorbent in the PSA decarbonization unit are extracted by a vacuum pump and treated by a deodorization unit before being directly discharged into the atmosphere.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A mixed landfill gas and biogas power generation system, characterized by: Including air intake Pipeline (1), booster fan (2), purification equipment (3), gas storage tank (4), gas outlet pipeline (5), biogas pretreatment system (6), biogas generator set (7), landfill gas transmission pipeline (8) and perishable waste biogas transmission pipeline (9). Low-concentration landfill gas with a methane content of less than 40% from landfill gas transmission pipeline (8) is sent to the intake pipeline (1) through booster fan (2). Perishable waste biogas with a methane content of not less than 50% from perishable waste biogas transmission pipeline (9) is treated by purification equipment (3) and sent to the intake pipeline (1) to mix with landfill gas and send to the gas storage tank (4). After being mixed in proportion by constant pressure control device (10), high-concentration biogas with a methane content of more than 40% is formed. The high-concentration biogas is introduced into the biogas pretreatment system (6) through the gas outlet pipeline (5) for pretreatment and purification and then supplied to the biogas generator set (7).

2. The mixed landfill gas and biogas power generation system according to claim 1, characterized in that: The biogas pretreatment system (6) includes a biogas dehydration device, a booster fan, an air-cooled radiator, and a precision filter.

3. The mixed landfill gas and biogas power generation system according to claim 2, characterized in that: The precision filter includes a primary filter with a particle size of 10 μm and a secondary filter with a particle size of 3 μm.

4. The mixed landfill gas and biogas power generation system according to claim 1, characterized in that: The output pipeline of the biogas pretreatment system (6) is equipped with a pipeline pressure gauge, an output pipeline gas flow meter, an output pipeline methane concentration sensor, an output pipeline temperature sensor, an output pipeline pneumatic shut-off valve, a manual air inlet valve, and a flame arrester.

5. The mixed landfill gas and biogas power generation system according to claim 1, characterized in that: An air pressure gauge is installed on the air outlet pipe (5).

6. The mixed landfill gas and biogas power generation system according to claim 1, characterized in that: The biogas generator set (7) includes a generator and a biogas internal combustion engine that are coupled together.

7. The mixed landfill gas and biogas power generation system according to claim 1, characterized in that: An oxygen sensor is installed on the exhaust pipe of the biogas generator set (7).

8. The mixed landfill gas and biogas power generation system according to claim 1, characterized in that: A Roots blower, a PSA decarbonization device, and a product gas buffer tank are sequentially connected between the biogas pretreatment system (6) and the biogas generator set (7).

9. The mixed landfill gas and biogas power generation system according to claim 8, characterized in that: High-concentration biogas with a methane content of more than 40% is pressurized by a Roots blower and then partially decarbonized by a PSA decarbonization device to obtain high-calorific-value biogas with a methane content of more than 50%. After being buffered by a product gas buffer tank, it is supplied to the biogas generator set (7).

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