CN220907442U - Landfill gas concentration feed system - Google Patents
Landfill gas concentration feed system Download PDFInfo
- Publication number
- CN220907442U CN220907442U CN202322187768.1U CN202322187768U CN220907442U CN 220907442 U CN220907442 U CN 220907442U CN 202322187768 U CN202322187768 U CN 202322187768U CN 220907442 U CN220907442 U CN 220907442U
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- China
- Prior art keywords
- main pipe
- biogas
- gas
- generator set
- methane
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 68
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 14
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 238000005262 decarbonization Methods 0.000 claims abstract description 8
- 210000001503 joint Anatomy 0.000 claims abstract description 7
- 230000018044 dehydration Effects 0.000 claims abstract description 4
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 4
- 230000001877 deodorizing effect Effects 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 60
- 238000001914 filtration Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000010248 power generation Methods 0.000 abstract description 7
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 21
- 238000001179 sorption measurement Methods 0.000 description 20
- 238000005261 decarburization Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 239000003463 adsorbent Substances 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000004332 deodorization Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The utility model discloses a landfill gas concentration supply system, which comprises a biogas pretreatment system, a Roots blower, a PSA decarbonization device, a product gas buffer tank and a biogas generator set which are sequentially in butt joint, wherein the biogas pretreatment system comprises a biogas dehydration device, a booster blower, an air-cooled radiator and a precision filter, an air inlet pressure gauge is arranged on an air inlet main pipe of the biogas pretreatment system, a main pipe pressure gauge, a main pipe gas flowmeter, a main pipe methane concentration sensor, a main pipe temperature sensor, a main pipe pneumatic on-off valve and a manual air inlet valve are arranged on an air outlet main pipe of the biogas pretreatment system, and carbon dioxide and impurity gas adsorbed by the PSA decarbonization device are pumped out through a vacuum pump and are treated by a butt joint deodorizing device to be discharged directly. According to the utility model, the low-concentration landfill gas is separated from part of carbon dioxide to improve the methane concentration to more than 50%, so that the power generation efficiency of the methane generator set is improved, and the service life of the methane generator set is prolonged.
Description
Technical Field
The utility model relates to the technical field of biogas power generation, in particular to a landfill gas concentration supply system.
Background
The landfill gas generated by anaerobic fermentation in the Tianziling landfill is used as a main gas source of the biogas generator set, the methane concentration is about 50% originally, the methane concentration is gradually reduced to 33-46% along with the increase of the service life of the landfill, and the carbon dioxide concentration is 26-38%, so that the full-load operation of the biogas generator set is difficult to maintain. Methane concentration of the methane generator set is required to reach more than 50%. In order to meet the gas requirement of the existing biogas generator set, energy waste is not caused, the gas supply of the generator set is required to be modified, the power generation efficiency is improved, and the service life of the biogas generator set is prolonged.
Disclosure of utility model
Aiming at the defects of the prior art, the application aims to provide a landfill gas concentration supply system, which improves the methane concentration to more than 50% by removing part of carbon dioxide from low-concentration landfill gas, improves the power generation efficiency of a methane generator set and prolongs the service life of the methane generator set.
The application solves the technical problems through the following technical proposal
The garbage landfill gas concentration supply system comprises a methane pretreatment system, a Roots blower, a PSA decarburization device, a product gas buffer tank and a methane generator set which are sequentially in butt joint, wherein low-concentration garbage landfill gas with the methane content of less than 50% is pretreated and purified by the methane pretreatment system, then partial carbon dioxide is removed through the PSA decarburization device after the pressure is increased by the Roots blower to obtain high-concentration garbage landfill gas with the methane content of more than 50%, the high-concentration garbage landfill gas is buffered by the product gas buffer tank and then supplied to the methane generator set, and carbon dioxide and impurity gas adsorbed by the PSA decarburization device are pumped out through a vacuum pump and are treated by the butt joint deodorizing device, and then the air is directly discharged.
Preferably, the biogas pretreatment system comprises a biogas dehydration device, a booster fan, an air-cooled radiator and a precise filter.
Preferably, the fine filter includes a primary filter having a filtration particle size of 10 μm and a secondary filter having a filtration particle size of 3 μm.
Preferably, an air inlet pressure gauge is arranged on an air inlet main pipe of the biogas pretreatment system.
Preferably, a main pipe pressure meter, a main pipe gas flowmeter, a main pipe methane concentration sensor, a main pipe temperature sensor, a main pipe pneumatic on-off valve and a manual air inlet valve are arranged on an air outlet main pipe of the methane pretreatment system.
Preferably, a gas pressure stabilizing valve, an electromagnetic cut-off valve, a gas flowmeter, a fuel metering valve, a pressure gauge and a temperature sensor are arranged on the gas supply pipeline between the product gas buffer tank and the biogas generating set.
Preferably, the biogas generator set comprises a generator and a biogas internal combustion engine which are coupled.
Preferably, an oxygen sensor is arranged on an exhaust gas discharge pipeline of the methane generator set.
The application has the beneficial effects that:
The method comprises the steps of filling raw materials with 500Nm 3/Hr of gas, wherein the methane content is 33-46%, the carbon dioxide content is 26-38%, the pressure is 30-40 kPa.g, the temperature is less than 35 ℃, purifying the raw materials by a biogas pretreatment system, washing the raw materials with water to remove impurities, then boosting the raw materials to 50kPa.g by a Roots blower, removing part of carbon dioxide by a PSA decarburization device, buffering the raw materials by a buffer tank, and then delivering the raw materials to a generator set for use, wherein the product gas is 500NM3/Hr, the concentration is 52-58%, so that the method is beneficial to improving the power generation efficiency, reducing the damage of harmful gases to equipment, prolonging the service life of the generator set, and directly discharging the carbon dioxide and other impurity gases adsorbed by an adsorbent of the PSA decarburization device to the air after being pumped by a vacuum pump and treated by a deodorizing device. The method is beneficial to the maximization of the benefits of the biogas power generation company in the aspects of economic benefits, environmental protection benefits and social benefits.
Drawings
In order to more clearly describe the embodiments of the present application or the technical solutions in the background art, the following description will describe the drawings that are required to be used in the embodiments of the present application or the background art.
Fig. 1 is a schematic structural view of an embodiment of the present application.
In the figure: 1-biogas pretreatment system, 2-Roots blower, 3-PSA decarbonization device, 4-product gas buffer tank, 5-biogas generator set, 6-vacuum pump and 7-deodorization device.
Description of the embodiments
Embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.
Referring to fig. 1, the landfill gas concentration supply system of the embodiment of the application comprises a biogas pretreatment system 1, a roots blower 2, a PSA decarburization device 3, a product gas buffer tank 4 and a biogas generator set 5 which are sequentially in butt joint, wherein the biogas pretreatment system 1 comprises a biogas dehydration device, a booster blower, an air-cooled radiator and a precise filter, and an air inlet pressure gauge is arranged on an air inlet main pipe of the biogas pretreatment system 1. The gas outlet main pipe of the methane pretreatment system 1 is provided with a main pipe pressure meter, a main pipe gas flowmeter, a main pipe methane concentration sensor, a main pipe temperature sensor, a main pipe pneumatic switching valve and a manual gas inlet valve. The fine filter comprises a primary filter having a filtration particle size of 10 μm and a secondary filter having a filtration particle size of 3. Mu.m. The gas supply pipeline between the product gas buffer tank 4 and the methane generator set 5 is provided with a gas pressure stabilizing valve, an electromagnetic cut-off valve, a gas flowmeter, a fuel metering valve, a pressure gauge and a temperature sensor. The biogas generator set 5 comprises a generator and a biogas internal combustion engine which are coupled. An oxygen sensor is arranged on the tail gas discharge pipeline of the methane generator set 5.
The low-concentration landfill gas with the methane content of less than 50% is pretreated and purified by a methane pretreatment system 1, water washing and impurity removal are carried out, then partial carbon dioxide is removed by a PSA decarbonization device 3 after the pressure is increased by a Roots blower 2 to obtain high-concentration landfill gas with the methane content of more than 50%, the landfill gas is buffered by a product gas buffer tank 4 and then is supplied to a methane generator set 5, and carbon dioxide and impurity gas adsorbed by the PSA decarbonization device 3 are pumped out by a vacuum pump 6 and then are treated by a butt deodorization device 7 and then are discharged directly to the air.
The PSA decarbonization device 3 employs a VPSA process. And (3) an inlet: the flow rate is 840Nm 3/hr, the temperature T is 20-50 ℃, the pressure P is more than or equal to 0.75MPa.G, and the component CO2 is less than or equal to 43%; and (3) an outlet: CO2 is less than or equal to 3 percent, the pressure is more than or equal to 0.63MPa.G, and the dew point temperature is less than or equal to-50 ℃. The adsorption and regeneration process comprises the steps of adsorption, pressure equalizing and reducing, vacuumizing, pressure equalizing and boosting, product gas boosting and the like.
A. Adsorption process: the landfill gas pressure is about 0.05MPa (G), the temperature is 20-40 ℃, and the landfill gas enters an adsorption tower in an adsorption state from the bottom of the tower. Under the sequential selective adsorption of a plurality of adsorbents, impurities such as CO 2 and the like are adsorbed, and the un-adsorbed CH 4、N2、O2 is taken as a product to flow out of the top of the tower and is sent to a post-working section. When the front edge of the mass transfer zone of the adsorbed impurities (called adsorption front edge) reaches the reserved section of the bed layer outlet, the feed gas inlet valve and the product gas outlet valve of the adsorption tower are closed, and the adsorption is stopped. The adsorbent bed begins to shift into the regeneration process.
B. Equalizing and reducing pressure: after the adsorption process is finished, the methane with higher pressure in the tower is put into other regenerated lower pressure adsorption towers along the adsorption direction, and the process is not only a depressurization process, but also a process for recovering methane in the dead space of the bed layer, so that the sufficient recovery of CH 4 can be ensured.
C. And (3) vacuumizing: after the pressure equalizing and reducing process is finished, the partial pressure of impurity components is further reduced by vacuumizing to completely regenerate the vacuum desorption gas, so that the adsorbent can directly discharge/purify the desorption gas to the outside for power generation.
E. Equalizing and boosting: after the vacuumizing regeneration process is finished, the higher-pressure biogas from other adsorption towers is used for sequentially boosting the pressure of the adsorption towers, and the process corresponds to the pressure equalizing and reducing process, and is not only a boosting process, but also a process for recovering the bed dead space CH4 of the other towers.
H. The product air pressure rising process comprises the following steps: after the pressure equalizing and boosting process is completed, in order to enable the adsorption tower to be smoothly switched to the next adsorption and ensure that the product purity does not fluctuate in the process, the pressure of the adsorption tower needs to be slowly and smoothly increased to the adsorption pressure by the product CH4 through a pressure boosting regulating valve. After this process, the adsorption tower completes a complete adsorption-regeneration cycle and is ready for the next adsorption.
The foregoing is merely a part of examples and embodiments of the present utility model, and the scope of the present utility model is not limited thereto, and any person skilled in the art who is familiar with the present utility model can easily think about changes or substitutions within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims (4)
1. Landfill gas concentration feed system, characterized by: the device comprises a biogas pretreatment system (1), a Roots blower (2), a PSA decarbonization device (3), a product gas buffer tank (4) and a biogas generator set (5) which are sequentially in butt joint, wherein the biogas pretreatment system (1) comprises a biogas dehydration device, a booster blower, an air-cooled radiator and a precision filter, the precision filter comprises a primary filter with a filtration particle size of 10 mu m and a secondary filter with a filtration particle size of 3 mu m, an air inlet pressure gauge is arranged on an air inlet main pipe of the biogas pretreatment system (1), a main pipe pressure gauge, a main pipe gas flowmeter, a main pipe methane concentration sensor, a main pipe temperature sensor, a main pipe pneumatic on-off valve and a manual air inlet valve are arranged on an air outlet main pipe of the biogas pretreatment system (1), and carbon dioxide and impurity gas adsorbed by the PSA decarbonization device (3) are pumped out through a vacuum pump (6) and then are treated by the butt joint deodorizing device (7).
2. The landfill gas concentration feed system according to claim 1, wherein: a gas pressure stabilizing valve, an electromagnetic cut-off valve, a gas flowmeter, a fuel metering valve, a pressure gauge and a temperature sensor are arranged on a gas supply pipeline between the product gas buffer tank (4) and the biogas generator set (5).
3. The landfill gas concentration feed system according to claim 1, wherein: the biogas generator set (5) comprises a generator and a biogas internal combustion engine which are connected in a coupling way.
4. The landfill gas concentration feed system according to claim 1, wherein: an oxygen sensor is arranged on the tail gas discharge pipeline of the methane generator set (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322187768.1U CN220907442U (en) | 2023-08-15 | 2023-08-15 | Landfill gas concentration feed system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322187768.1U CN220907442U (en) | 2023-08-15 | 2023-08-15 | Landfill gas concentration feed system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220907442U true CN220907442U (en) | 2024-05-07 |
Family
ID=90913930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322187768.1U Active CN220907442U (en) | 2023-08-15 | 2023-08-15 | Landfill gas concentration feed system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220907442U (en) |
-
2023
- 2023-08-15 CN CN202322187768.1U patent/CN220907442U/en active Active
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