Refuse landfill gas pretreatment purification mixed gas supply system

Abstract

The utility model discloses a landfill gas pretreatment purification mixed gas supply system which comprises a pretreatment system, a purification device, a gas mixer, a plurality of biogas generator sets, a carbon dioxide separation device and a carbon dioxide storage tank which are of a skid-mounted integrated structure. A purification device and a gas mixer are sequentially arranged on a gas outlet header pipe of the pretreatment system, gas inlet branch pipes of all the biogas generator sets are in parallel confluence connection with the tail end of the gas outlet header pipe, and tail gas straight pipes of all the biogas generator sets are in parallel confluence connection with a carbon dioxide separation device and a storage tank. Landfill gas is purified into high-concentration landfill gas through the purification device, and the high-concentration landfill gas and carbon dioxide gas stored in the storage tank are mixed through the gas mixer and then enter the gas inlet branch pipe of each biogas generator set. According to the system, landfill gas is purified and mixed with non-fuel gas to obtain high-concentration landfill gas to be supplied to biogas for power generation, the power generation efficiency is improved, the economic benefit is increased, and the service life of a generator set is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of biogas power generation technology, and in particular to a landfill gas pretreatment and purification mixed gas supply system. Background Technology

[0002] Firstly, landfill gas, produced by anaerobic fermentation in landfills, is the primary gas source for generator sets, with a methane concentration of around 50%. As landfills age, this methane concentration gradually decreases, making it difficult to maintain full-load operation of the generator sets. Generator sets require a methane concentration of at least 50%. To ensure the continued normal operation of existing generator sets, better utilize landfill gas, and avoid energy waste, system upgrades are necessary. Under limited resource conditions, increasing energy density helps reduce the actual amount of biogas entering the generator sets. Purifying landfill gas at its source is an important research topic, as it can significantly reduce the damage to equipment from harmful gases while improving power generation efficiency and extending the lifespan of the generator sets. Utility Model Content

[0003] This application addresses the shortcomings of existing technologies by providing a landfill gas pretreatment, purification, and mixing gas supply system. By purifying landfill gas and then mixing it with non-fuel gases to obtain high-concentration landfill gas of the required purity, this system supplies biogas generator sets with the gas for power generation. This helps to improve power generation efficiency, increase economic benefits, reduce power generation costs, and extend the service life of the generator sets.

[0004] This application solves the above-mentioned technical problems through the following technical solutions.

[0005] The landfill gas pretreatment, purification, and mixing supply system comprises a pretreatment system, a purification device, a gas mixer, several biogas generator sets, a carbon dioxide separator, and a carbon dioxide storage tank, all in a skid-mounted integrated structure. The purification device and gas mixer are sequentially installed on the main outlet pipe of the pretreatment system. The inlet branch pipes of each biogas generator set are connected in parallel to the end of the main outlet pipe. The exhaust gas straight pipes of each biogas generator set are connected in parallel to the carbon dioxide separator and the carbon dioxide storage tank. The carbon dioxide gas separated by the carbon dioxide separator is stored in the carbon dioxide storage tank. The landfill gas, purified by the purification device into high-concentration landfill gas, is mixed with the carbon dioxide gas stored in the carbon dioxide storage tank through the gas mixer before entering the inlet branch pipes of each biogas generator set.

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

[0007] As a preferred option, the booster blower is a Roots blower.

[0008] 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.

[0009] Preferably, an intake pressure gauge is installed on the intake manifold of the pretreatment system.

[0010] Preferably, the main outlet pipe of the pretreatment system is equipped with a main pipe pressure gauge, a main pipe gas flow meter, a main pipe methane concentration sensor, a main pipe temperature sensor, a main pipe pneumatic shut-off valve, and a manual inlet valve.

[0011] Preferably, the intake manifold is equipped with a gas pressure regulating valve, an electromagnetic shut-off valve, a manifold gas flow meter, a fuel metering valve, a manifold pressure gauge, and a manifold temperature sensor.

[0012] Preferably, the biogas generator set includes a generator and a biogas internal combustion engine that are coupled together.

[0013] As a preferred option, an oxygen sensor is installed on the exhaust pipe of the biogas generator set.

[0014] As a preferred option, a flame arrester is also installed on the main exhaust pipe.

[0015] The beneficial effects of this application are:

[0016] The collected landfill gas is purified by a purification device. For example, 500 NM3 / Hr of raw gas (45% methane content) is purified to 65-95% purity using PSA pressure swing adsorption. Then, it is mixed with carbon dioxide gas stored in a carbon dioxide storage tank through a gas mixer to a volume of 500 NM3 / Hr and a concentration of about 58%. This mixture is then supplied to various biogas generator sets for biogas power generation, achieving peak power generation and greatly improving power generation efficiency. Furthermore, it significantly reduces the damage of harmful gases to the equipment and helps extend the service life of the generator sets, enabling the power generation company to maximize its economic, environmental, and social benefits. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0018] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0019] In the diagram: 1-Pretreatment system, 2-Purification device, 3-Gas mixer, 4-Biogas generator set, 5-Carbon dioxide separator, 6-Carbon dioxide storage tank, 7-Outlet main pipe, 8-Inlet branch pipe, 9-Inlet main pipe, 10-Inlet pressure gauge, 11-Main pipe pressure gauge, 12-Main pipe gas flow meter, 13-Main pipe methane concentration sensor, 14-Main pipe temperature sensor, 15-Main pipe pneumatic shut-off valve, 16-Manual inlet valve, 17-Gas pressure regulating valve, 18-Solenoid shut-off valve, 19-Branch pipe gas flow meter, 20-Fuel metering valve, 21-Branch pipe pressure gauge, 22-Branch pipe temperature sensor. Detailed Implementation

[0020] The embodiments of this application are described below with reference to the accompanying drawings.

[0021] Please see Figure 1 The landfill gas pretreatment and purification mixed gas supply system of this application embodiment includes a pretreatment system 1, a purification device 2, a gas mixer 3, several biogas generator sets 4, a carbon dioxide separator 5, and a carbon dioxide storage tank 6, all in a skid-mounted integrated structure. The pretreatment system 1 includes a biogas dehydration device, a booster fan, an air-cooled radiator, and a precision filter. For example, the booster fan is a Roots blower, and the precision filter includes a primary filter with a 10μm filter particle size and a secondary filter with a 3μm filter particle size. An inlet pressure gauge 10 is installed on the inlet main pipe 9 of the pretreatment system 1. The purification device 2 and the gas mixer 3 are sequentially installed on the outlet main pipe 7 of the pretreatment system 1, and a main pipe pressure gauge 11, a main pipe gas flow meter 12, a main pipe methane concentration sensor 13, a main pipe temperature sensor 14, a main pipe pneumatic shut-off valve 15, a manual inlet valve 16, and a flame arrester are also provided. The biogas generator set 4 includes a generator and a biogas internal combustion engine coupled together. An oxygen sensor is installed on the exhaust gas discharge pipe of the biogas generator set 4. The intake branch pipe 8 of each biogas generator set 4 forms a parallel confluence connection with the end of the exhaust main pipe 7. The intake branch pipe 8 is equipped with a gas pressure regulating valve 17, an electromagnetic shut-off valve 18, a branch pipe gas flow meter 19, a fuel metering valve 20, a branch pipe pressure gauge 21, and a branch pipe temperature sensor 22. The exhaust gas from each biogas generator set 4 is introduced into the carbon dioxide separation device 5, where the separated carbon dioxide gas is stored in a carbon dioxide storage tank 6. Low-concentration landfill gas is purified into high-concentration landfill gas by the purification device 2 and mixed with the carbon dioxide gas stored in the carbon dioxide storage tank 6 through a gas mixer 3 before entering the intake branch pipe 8 of each biogas generator set.

[0022] The above description is only a partial embodiment and implementation of this utility model. The protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A landfill gas pretreatment and purification mixed gas supply system, characterized by: The pre-treatment system (1), the purification device (2), the gas mixer (3), the biogas generator (4), the carbon dioxide separation device (5) and the carbon dioxide storage tank (6) are in a pry-dressing integrated structure, the purification device (2) and the gas mixer (3) are arranged on the gas outlet main pipe (7) of the pre-treatment system (1) in sequence, the gas inlet branch pipes (8) of the biogas generators (4) are connected in parallel with the tail end of the gas outlet main pipe (7), the tail gas pipes of the biogas generators (4) are connected in parallel with the carbon dioxide separation device (5) and the carbon dioxide storage tank (6), the carbon dioxide gas separated by the carbon dioxide separation device (5) is stored in the carbon dioxide storage tank (6), the landfill gas is purified into high-concentration landfill gas by the purification device (2), and then enters the gas inlet branch pipes (8) of the biogas generators through the gas mixer (3) and the carbon dioxide gas stored in the carbon dioxide storage tank (6).

2. The LFG pre-treatment purification mixed gas supply system according to claim 1, characterized by: The pre-treatment system (1) comprises a biogas dehydration device, a booster fan, an air-cooled radiator and a precision filter.

3. The LFG pre-treatment purification mixed gas supply system according to claim 2, characterized by: The booster fan is a Roots fan.

4. The LFG pre-treatment purification mixed gas supply system according to claim 2, characterized by: The precision filter comprises a first filter with a filtering particle size of 10 μm and a second filter with a filtering particle size of 3 μm.

5. The LFG pre-treatment purification mixed gas supply system of claim 1, wherein: An inlet pressure gauge (10) is arranged on the gas inlet main pipe (9) of the pre-treatment system (1).

6. The LFG pre-treatment purification mixed gas supply system of claim 1, wherein: A main pipe pressure gauge (11), a main pipe gas flow meter (12), a main pipe methane concentration sensor (13), a main pipe temperature sensor (14), a main pipe pneumatic open-close valve (15) and a manual inlet valve (16) are arranged on the gas outlet main pipe (7) of the pre-treatment system (1).

7. The LFG pre-treatment purification mixed gas supply system of claim 1, wherein: A gas pressure stabilizing valve (17), an electromagnetic cut-off valve (18), a branch pipe gas flow meter (19), a fuel metering valve (20), a branch pipe pressure gauge (21) and a branch pipe temperature sensor (22) are arranged on the gas inlet branch pipe (8).

8. The LFG pre-treatment purification mixed gas supply system of claim 1, wherein: The biogas generator (4) comprises a coupled generator and a biogas internal combustion engine.

9. The LFG pre-treatment purification mixed gas supply system of claim 1, wherein: An oxygen sensor is arranged on the tail gas discharge pipeline of the biogas generator (4).

10. The LFG pre-treatment purification mixed gas supply system of claim 1, wherein: A flame arrester is further arranged on the gas outlet main pipe (7).

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