CN213977579U - Landfill gas purification system - Google Patents
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- CN213977579U CN213977579U CN202020560534.0U CN202020560534U CN213977579U CN 213977579 U CN213977579 U CN 213977579U CN 202020560534 U CN202020560534 U CN 202020560534U CN 213977579 U CN213977579 U CN 213977579U
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- 238000000746 purification Methods 0.000 title claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 248
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 206
- 238000001914 filtration Methods 0.000 claims abstract description 108
- 239000003345 natural gas Substances 0.000 claims abstract description 89
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000001035 drying Methods 0.000 claims abstract description 47
- 238000000926 separation method Methods 0.000 claims abstract description 46
- 239000012528 membrane Substances 0.000 claims abstract description 43
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 31
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 238000011084 recovery Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 99
- 230000005540 biological transmission Effects 0.000 claims description 50
- 238000001179 sorption measurement Methods 0.000 claims description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 24
- 230000003009 desulfurizing effect Effects 0.000 claims description 24
- 239000012535 impurity Substances 0.000 claims description 22
- 239000011148 porous material Substances 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 15
- 239000004642 Polyimide Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000012510 hollow fiber Substances 0.000 claims description 12
- 229920001721 polyimide Polymers 0.000 claims description 12
- 230000018044 dehydration Effects 0.000 claims description 9
- 238000006297 dehydration reaction Methods 0.000 claims description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 8
- 239000004745 nonwoven fabric Substances 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 6
- 235000012255 calcium oxide Nutrition 0.000 claims description 4
- 239000000292 calcium oxide Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 208000005156 Dehydration Diseases 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 8
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 6
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 235000011089 carbon dioxide Nutrition 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Drying Of Gases (AREA)
Abstract
The utility model discloses a landfill gas purification system, which comprises a gas-liquid separation system, an oil removal device, a compressor, a buffer tank group, a filtering system, a drying unit, a heater group, a separation membrane group, a carbon dioxide recovery system and a natural gas product using system; the liquid separation system, the oil removal device, the compressor, the buffer tank group, the filtering system, the drying unit, the heater group, the separation membrane group and the natural gas product using system are sequentially communicated, the separation membrane group is connected with the carbon dioxide recovery system, the filtering system comprises a first filter group and a second filter group, and the drying unit is arranged between the first filter group and the second filter group; the utility model has the advantages that: the method can improve the operation stability and the methane recovery rate, reduce the energy consumption of the system, and is suitable for filtering out complex components in the landfill gas to improve the methane purity.
Description
Technical Field
The utility model relates to a renewable energy recovery device, specifically speaking are landfill gas purification system belongs to renewable energy recovery device field.
Background
The landfill gas is generated in a sanitary landfill site of the garbage, is a product obtained by degrading organic components in the garbage, mainly comprises methane and carbon dioxide, wherein the content of the methane is about 55-70%, the content of the carbon dioxide is about 25-45%, and the balance is a small amount of air, hydrogen sulfide, ammonia gas, VOCs, water vapor, dust and other trace gases, so that the landfill gas is a renewable clean energy source. The main uses of landfill gas utilization are three: as boiler fuel, power generation and natural gas production; wherein the natural gas is obtained by purifying the landfill gas, and has the most economic benefit and social value; the purified and purified compressed natural gas (GB 18047-2000) for vehicles, which can meet the national standard, can replace the conventional natural gas to be used as the natural gas for vehicles, and can also enter a medium-pressure pipe network through pressure regulation to be used as a supplementary gas source;
at present, most landfill gas treatment systems are mainly suitable for being used as boiler fuel and power generation, although hydrogen sulfide in landfill gas can be removed, the hydrogen sulfide is simply purified and filtered, complex trace components in the landfill gas are difficult to remove, and the problems that the landfill gas treatment efficiency is rapidly reduced, the methane purity is reduced and the like are caused; the purity standard of prepared natural gas for methane in landfill gas is higher than that of the prepared natural gas used as boiler fuel and power generation, and most landfill gas treatment systems which need to be purified cannot meet the requirements of the prepared natural gas.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model discloses a landfill gas purification system can improve operating stability and methane rate of recovery, has reduced the system energy consumption, is fit for filtering the complicated composition improvement methane purity of landfill gas.
The technical scheme of the utility model is that:
a landfill gas purification system comprises a gas-liquid separation system, an oil removal device, a compressor, a buffer tank group, a filtering system, a drying unit, a heater group, a separation membrane group, a carbon dioxide recovery system and a natural gas product using system; liquid separation system, deoiling device, compressor, buffer tank group, filtration system, drying unit, heater group, separation membrane group and natural gas product use system be linked together in proper order, the separation membrane group links to each other with carbon dioxide recovery system, filtration system includes first filter group and second filter group, drying unit sets up first filter group and second filter group between.
The gas-liquid separation system is used for removing moisture and solid particles in the landfill gas and consists of a condensate tank group, a filtering pipeline system, a booster fan group, a steam-water separator system, a cooler group, a desulfurizing tower and an adsorption tower; the condensate tank group consists of a first condensate tank, a second condensate tank and a third condensate tank, the first condensate tank, the second condensate tank and the third condensate tank are consistent in structure, and an inlet, a condensate outlet and a condensate gas outlet are arranged; the condensate tank is used for removing liquid particles and solid particles in the landfill gas to obtain condensate and condensate gas, so that the damage of the leachate in the landfill gas to equipment in the system can be prevented; an inlet of the first condensate tank is connected with the landfill gas transmission pipeline, and a condensate gas outlet of the first condensate tank is connected with an inlet of the first filtering pipeline; an inlet of the second condensate tank is connected with an outlet of the first filtering pipeline, and a condensed gas outlet of the second condensate tank is connected with an inlet of the second filtering pipeline; an inlet of the third condensate tank is connected with an outlet of a third filtering pipeline, and a condensate gas outlet of the third condensate tank is connected with an inlet of a second booster fan through a gas pipeline;
the filtering pipeline system is used for assisting the system in dewatering and impurity removing and comprises a first filtering pipeline, a second filtering pipeline and a third filtering pipeline; the first filtering pipeline is internally provided with coarse-pore sponge filtering layers at equal intervals for assisting in removing water and impurities, the front and the back of each coarse-pore sponge filtering layer are PVC transverse grids, and coarse-pore sponge is clamped in the middle of each coarse-pore sponge filtering layer; the pipeline of the second filtering pipeline is internally provided with semicircular filtering plates which are inclined backwards at equal intervals, the inclination angle is 30-90 degrees, the effect of auxiliary filtering is achieved, meanwhile, the gas passing speed is not hindered, the semicircular filtering plates are provided with a plurality of round holes, two sides of each semicircular filtering plate are adhered with mesoporous activated carbon non-woven fabrics, and the aperture is 2-50 nm and used for auxiliary drying and impurity removal; a filtering partition is equidistantly arranged in the third filtering pipeline, blade-shaped vertical bars are equidistantly arranged on the filtering partition, a microporous activated carbon non-woven fabric is adhered to one side of each blade-shaped vertical bar, and the pore diameter is smaller than 2 nm; a middle-hole sponge layer is stuck on the other side, and the aperture is between 25 and 35 ppi; for assisting in drying and removing particulate impurities; the first filtering pipeline is connected between a condensed gas outlet of the first condensed liquid tank and an inlet of the second condensed liquid tank; the second filtering pipeline is connected between a condensed gas outlet of the second condensed liquid tank and an inlet of the first booster fan; the third filtering pipeline is connected between the outlet of the adsorption tower and the inlet of the third condensate tank;
the booster fan set consists of a first booster fan and a second booster fan; the first booster fan and the second booster fan have the same structure and are provided with inlets and outlets; used for boosting and heating the condensed gas; the inlet of the first booster fan is connected with the outlet of the second filtering pipeline, and the outlet of the first booster fan is connected with the inlet of the first cooler through a gas transmission pipeline; an inlet of the second booster fan is connected with a condensed gas outlet of the third condensed liquid tank through a gas transmission pipeline, and an outlet of the second booster fan is connected with an inlet of the second cooler;
the steam-water separator system is used for dehydrating and drying and discharging water in landfill gas and comprises a first steam-water separator, a second steam-water separator and a third steam-water separator; the first steam-water separator, the second steam-water separator and the third steam-water separator are respectively provided with an inlet, a gas outlet and a water outlet, and the gas outlet is used for discharging dehydrated dry gas; the water outlet is used for discharging the separated water; the inlet of the first steam-water separator is communicated with the outlet of the first cooler through a gas pipeline; the gas outlet of the first steam-water separator is communicated with the inlet of the second steam-water separator through a gas transmission pipeline; the gas outlet of the second steam-water separator is connected with the inlet of the vulcanizing tower through a gas pipeline; an inlet of the third steam-water separator is communicated with an outlet of the second cooler through a gas transmission pipeline; the gas outlet of the third steam-water separator is communicated with the inlet of the oil removal device through a gas transmission pipeline; the water outlets of the first steam-water separator, the second steam-water separator and the third steam-water separator are respectively connected with an external drainage pipeline; the first steam-water separator is a baffle type separator and is suitable for large gas velocity fluctuation; the second steam-water separator is an adsorption type separator and is suitable for medium gas velocity fluctuation; the third steam-water separator is a cyclone separator and is suitable for gas velocity fluctuation below the medium level;
the cooler group is used for cooling landfill gas and consists of a first air cooler and a second cooler, the first air cooler and the second cooler have the same structure and are provided with inlets and outlets; the inlet of the first cooler is connected with the outlet of the first booster fan, the outlet of the first cooler is connected with the inlet of the first steam-water separator, the inlet of the second cooler is connected with the outlet of the second booster fan, and the outlet of the second cooler is connected with the inlet of the third steam-water separator;
the desulfurizing tower comprises any one of a dry desulfurizing tower, a wet desulfurizing tower, a biological desulfurizing tower and a complex iron desulfurizing tower; the inlet of the desulfurizing tower is connected with the gas outlet of the second water-vapor separator, and the outlet of the desulfurizing tower is communicated with the inlet of the adsorption tower;
the adsorption tower is an activated carbon adsorption tower, and quicklime is put in the adsorption tower, and can remove acid penetrating fluid in landfill gas; the outlet of the adsorption tower is communicated with the inlet of the third filtering pipeline;
the oil removing device is used for removing grease in the landfill gas and is provided with an inlet and an outlet; an inlet of the oil removing device is communicated with a gas outlet of the third steam-water separator through a gas transmission pipeline, and an outlet of the oil removing device is communicated with an inlet of the compressor;
the compressor is a methane compressor and is used for improving the phenomenon of insufficient landfill gas pressure so as to ensure that methane is combusted more fully; the inlet of the compressor is communicated with the outlet of the oil removing device through a gas transmission pipeline, and the outlet of the compressor is connected with the inlet of the buffer tank group through a three-way gas transmission pipeline;
the buffer tank group is formed by connecting two buffer tanks in parallel left and right; the buffer tank is provided with an inlet and an outlet; the inlet of the buffer tank group is connected with the outlet of the compressor through a three-way gas transmission pipeline; outlets of a left buffer tank and a right buffer tank of the buffer tank group are respectively connected with inlets of a left filter and a right filter of the first filter group through gas transmission pipelines; the buffer tank is a diaphragm type buffer tank;
the filter system consists of a first filter group and a second filter group, and the first filter group and the second filter group consist of filters which are connected in parallel left and right; the first filter group consists of two high-efficiency filters and is used for trapping particle dust and various suspended matters above 0.5 um; the second filter group consists of two ultra-high efficiency filters and is used for trapping particle dust and various suspended matters below 0.5um, and the purification rate is 99.9995%;
the drying unit is formed by connecting two drying machines in parallel left and right and is used for drying landfill gas; inlets of a left drier and a right drier of the drier unit are respectively connected with outlets of a left filter and a right filter of the first filter unit through gas transmission pipelines; the outlets of the left drier and the right drier of the drier unit are respectively connected with the inlets of the left filter and the right filter of the second filter unit through gas transmission pipelines; the dryer is an adsorption dryer;
the heater group consists of heaters which are connected in parallel at left and right, is provided with an inlet and an outlet and is used for heating; the left and right heater inlets of the heater group are respectively connected with the outlets of the left and right filters of the second filter unit; the outlets of the left and right heaters of the heater group are connected with the separation membrane group through Y-shaped gas transmission pipelines;
the separation membrane module is a polyimide hollow fiber membrane module, and carbon dioxide, a small amount of oxygen and nitrogen can be removed by the polyimide hollow fiber membrane module to obtain a natural gas product; the polyimide hollow fiber membrane component is provided with an inlet, a natural gas outlet and a miscellaneous gas outlet; the natural gas outlet is communicated with a natural gas main pipeline;
the carbon dioxide recovery system is a carbon dioxide recovery device, and is used for purifying, liquefying, filling and preparing dry ice for the carbon dioxide removed by the separation membrane group; and the inlet of the carbon dioxide recovery device is connected with the miscellaneous gas outlet of the separation membrane group through a gas transmission pipeline.
The natural gas product using system consists of an odorizing machine, a pressure regulating metering station and a natural gas storage system; the odorizing machine is used for odorizing natural gas and ensuring the safety of transportation and use; the odorizing machine is connected with the natural gas pipeline; the pressure regulating metering station is a station for regulating the pressure of a natural gas pipeline and metering the gas flow, and is used for receiving the natural gas obtained by the separation membrane group, conveying the natural gas to a main pipeline of an urban natural gas medium-pressure pipe network through a pipeline and supplying gas to the urban natural gas medium-pressure pipe network;
the natural gas storage system consists of a natural gas compressor and a natural gas storage tank; the inlet of the natural gas compressor is connected with the natural gas outlet of the separation membrane group through the natural gas main pipeline; the outlet of the compressor is connected with the natural gas storage tank and used for storing natural gas.
In addition, gas transmission switches are arranged on gas transmission pipelines among the gas-liquid separation system, the oil removal device, the compressor, the buffer tank group, the filtering system, the drying unit, the heater group, the separation membrane group, the carbon dioxide recovery system and the natural gas product.
The working process is as follows:
the landfill gas enters a first condensate tank through a gas transmission pipeline to be dehydrated and impurity-removed to form condensate and condensate gas, the condensate is discharged along a condensate outlet of the first condensate tank, the condensate gas enters a first filtering pipeline 1 to be filtered and dried, and then the condensate gas enters a second condensate tank to be dehydrated and impurity-removed for the second time; the condensed gas after the secondary dehydration and impurity removal enters a second filtering pipeline for filtering and drying, and then the condensed gas after the secondary dehydration and impurity removal enters a first booster fan for boosting pressure and heating to obtain boosted pressure gas; the obtained boosted gas is cooled and dried sequentially through the first cooler and the first steam-water separator to obtain dry gas; the obtained dry gas is subjected to secondary drying through the second steam-water separator, the obtained secondary dry gas is sent to a vulcanizing tower to remove hydrogen sulfide to obtain desulfurized gas, the desulfurized gas is sent to an adsorption tower to remove ammonia gas to obtain ammonia gas, the deaminated gas is dried and decontaminated through a third filtering pipeline and then enters a third condensate tank to be subjected to third dehydration and impurity removal to obtain condensed gas, the condensed gas is subjected to secondary pressurization and temperature increase through a second booster fan to obtain secondary pressurized gas, the obtained secondary pressurized gas is subjected to third temperature reduction and drying through the second cooler and a third steam-water separator in sequence to obtain tertiary dry gas, the tertiary dry gas is deoiled through a deoiling device and then sent to a compressor set and a buffer tank set to be pressurized to obtain tertiary pressurized gas, the tertiary pressurized gas is sent to a first filter set to be filtered to obtain filtered gas, sending the filter into the drying unit for fourth drying to obtain fourth drying gas, sending the fourth drying gas into a second filter group for secondary filtering to obtain secondary filtered gas, and sending the secondary filtered gas into a heater for heating to obtain heating gas; feeding the heated gas into a polyimide hollow fiber membrane module for separation, wherein the polyimide hollow fiber membrane module can remove carbon dioxide, a small amount of oxygen and nitrogen to obtain natural gas; odorizing the obtained natural gas by an odorizing device; the odorized natural gas has two use modes, one mode is that the pressure is increased through a natural gas compressor and then the odorized natural gas is stored in a natural gas storage tank; the other is that natural gas is input into a natural gas medium-pressure pipeline network through a natural gas pipeline and a fuel gas pressure regulating metering device; the separated carbon dioxide is input into a carbon dioxide recovery device for recycling.
The utility model has the advantages that: the landfill gas has large water content and high humidity, and simultaneously contains liquid and solid particle impurities, and the removal of water is the key of stable operation of the system. The utility model adopts the multi-stage circulation purification and drying technology, removes impurities through triple dehydration in the gas-liquid separation system, and removes the water, liquid and solid particle impurities of the landfill gas; removing oil from the landfill gas by an oil removing device, and then removing hydrogen sulfide and acidic penetrating fluid. The problems of system energy consumption increase, substandard gas quality and the like caused by the performance attenuation of the membrane group are prevented.
The utility model discloses to the unstable characteristics of landfill gas, carry out multiple dehydration and remove the impurity, realized the stability of going and improved the methane rate of recovery.
The present invention will be further explained with reference to the drawings and examples.
Drawings
FIG. 1 is a schematic structural view of a landfill gas purification system of the present invention;
FIG. 2 is a schematic structural diagram of a first filtering pipe in the filtering pipe system of the present invention;
FIG. 3 is a schematic structural view of a second filtering conduit in the filtering conduit system of the present invention;
FIG. 4 is a schematic structural view of a third filtering conduit in the filtering conduit system of the present invention;
in the figure: 1 first filter tube way, 11 coarse pore sponge filter layers, 12 PVC horizontal graticule mesh, 2 second filter tube ways, 21 semi-circular filter, 22 mesopore activated carbon non-woven fabrics, 3 third filter tube ways, 31 blade form vertical retort, 32 micropore activated carbon non-woven fabrics, 33 mesopore sponge layers.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is not intended to limit the invention.
Example 1
As shown in fig. 1, a landfill gas purification system includes a gas-liquid separation system, an oil removal device, a compressor, a buffer tank set, a filtration system, a drying unit, a heater set, a separation membrane set, a carbon dioxide recovery system, and a natural gas product use system; liquid separation system, deoiling device, compressor, buffer tank group, filtration system, drying unit, heater group, separation membrane group and natural gas product use system be linked together in proper order, the separation membrane group links to each other with carbon dioxide recovery system, filtration system includes first filter group and second filter group, drying unit sets up first filter group and second filter group between.
The gas-liquid separation system is used for removing moisture and solid particles in the landfill gas and consists of a condensate tank group, a filtering pipeline system, a booster fan group, a steam-water separator system, a cooler group, a desulfurizing tower and an adsorption tower; the condensate tank group consists of a first condensate tank, a second condensate tank and a third condensate tank, the first condensate tank, the second condensate tank and the third condensate tank are consistent in structure, and an inlet, a condensate outlet and a condensate gas outlet are arranged; the condensate tank is used for removing liquid particles and solid particles in the landfill gas to obtain condensate and condensate gas, so that the damage of the leachate in the landfill gas to equipment in the system can be prevented; an inlet of the first condensate tank is connected with the landfill gas transmission pipeline, and a condensate gas outlet of the first condensate tank is connected with an inlet of the first filtering pipeline 1; an inlet of the second condensate tank is connected with an outlet of the first filtering pipeline 1, and a condensate gas outlet of the second condensate tank is connected with an inlet of the second filtering pipeline 2; an inlet of the third condensate tank is connected with an outlet of the third filtering pipeline 3, and a condensate gas outlet of the third condensate tank is connected with an inlet of the second booster fan through a gas pipeline;
the filtering pipeline system is used for assisting a system to dehydrate and remove impurities and comprises a first filtering pipeline 1, a second filtering pipeline 2 and a third filtering pipeline 3; the first filtering pipeline 1 is internally provided with coarse-pore sponge filtering layers 11 at equal intervals for assisting in removing water and impurities, the front and the back of each coarse-pore sponge filtering layer 11 are PVC cross-grid meshes 12, and coarse-pore sponge is clamped in the middle; the pipeline inside of the second filtering pipeline 2 is equidistantly provided with semicircular filtering plates 21 which are inclined backwards, the inclination angle is 30-90 degrees, the function of auxiliary filtering is achieved, meanwhile, the gas passing speed is not hindered, a plurality of circular holes are formed in each semicircular filtering plate, two sides of each semicircular filtering plate are adhered with mesoporous activated carbon non-woven fabrics 22, the pore diameter is 2-50 nm, and the pore diameter is used for assisting in drying and removing impurities; a filtering partition is equidistantly arranged in the third filtering pipeline 3, blade-shaped vertical bars 31 are equidistantly arranged on the filtering partition, a microporous activated carbon non-woven fabric 32 is adhered to one side of each blade-shaped vertical bar 31, and the pore diameter is smaller than 2 nm; a middle-hole sponge layer 33 is stuck on the other side, and the aperture is between 25 and 35 ppi; for assisting in drying and removing particulate impurities; the first filtering pipeline 1 is connected between a condensed gas outlet of the first condensate tank and an inlet of the second condensate tank; the second filtering pipeline 2 is connected between a condensed gas outlet of the second condensed liquid tank and an inlet of the first booster fan; the third filtering pipeline 3 is connected between the outlet of the adsorption tower and the inlet of the third condensate tank;
the booster fan set consists of a first booster fan and a second booster fan; the first booster fan and the second booster fan have the same structure and are provided with inlets and outlets; used for boosting and heating the condensed gas; the inlet of the first booster fan is connected with the outlet of the second filtering pipeline, and the outlet of the first booster fan is connected with the inlet of the first cooler through a gas transmission pipeline; an inlet of the second booster fan is connected with a condensed gas outlet of the third condensed liquid tank through a gas transmission pipeline, and an outlet of the second booster fan is connected with an inlet of the second cooler;
the steam-water separator system is used for dehydrating and drying and discharging water in landfill gas and comprises a first steam-water separator, a second steam-water separator and a third steam-water separator; the first steam-water separator, the second steam-water separator and the third steam-water separator are respectively provided with an inlet, a gas outlet and a water outlet, and the gas outlet is used for discharging dehydrated dry gas; the water outlet is used for discharging the separated water; the inlet of the first steam-water separator is communicated with the outlet of the first cooler through a gas pipeline; the gas outlet of the first steam-water separator is communicated with the inlet of the second steam-water separator through a gas transmission pipeline; the gas outlet of the second steam-water separator is connected with the inlet of the vulcanizing tower through a gas pipeline; an inlet of the third steam-water separator is communicated with an outlet of the second cooler through a gas transmission pipeline; the gas outlet of the third steam-water separator is communicated with the inlet of the oil removal device through a gas transmission pipeline; the water outlets of the first steam-water separator, the second steam-water separator and the third steam-water separator are respectively connected with an external drainage pipeline; the first steam-water separator is a baffle type separator and is suitable for large gas velocity fluctuation; the second steam-water separator is an adsorption type separator and is suitable for medium gas velocity fluctuation; the third steam-water separator is a cyclone separator and is suitable for gas velocity fluctuation below the medium level;
the cooler group is used for cooling landfill gas and consists of a first air cooler and a second cooler, the first air cooler and the second cooler have the same structure and are provided with inlets and outlets; the inlet of the first cooler is connected with the outlet of the first booster fan, the outlet of the first cooler is connected with the inlet of the first steam-water separator, the inlet of the second cooler is connected with the outlet of the second booster fan, and the outlet of the second cooler is connected with the inlet of the third steam-water separator;
the desulfurizing tower comprises any one of a dry desulfurizing tower, a wet desulfurizing tower, a biological desulfurizing tower and a complex iron desulfurizing tower; the inlet of the desulfurizing tower is connected with the gas outlet of the second water-vapor separator, and the outlet of the desulfurizing tower is communicated with the inlet of the adsorption tower;
the adsorption tower is an activated carbon adsorption tower, and quicklime is properly put in the activated carbon adsorption tower, and the quicklime can remove acid penetrating fluid in landfill gas. The outlet of the adsorption tower is communicated with the inlet of the third filtering pipeline 3;
the oil removing device is used for removing grease in the landfill gas and is provided with an inlet and an outlet; an inlet of the oil removing device is communicated with a gas outlet of the third steam-water separator through a gas transmission pipeline, and an outlet of the oil removing device is communicated with an inlet of the compressor;
the compressor is a methane compressor and is used for improving the phenomenon of insufficient landfill gas pressure so as to ensure that methane is combusted more fully; the inlet of the compressor is communicated with the outlet of the oil removing device through a gas transmission pipeline, and the outlet of the compressor is connected with the inlet of the buffer tank group through a three-way gas transmission pipeline;
the buffer tank group is formed by connecting two buffer tanks in parallel left and right; the buffer tank is provided with an inlet and an outlet; the inlet of the buffer tank group is connected with the outlet of the compressor through a three-way gas transmission pipeline; outlets of a left buffer tank and a right buffer tank of the buffer tank group are respectively connected with inlets of a left filter and a right filter of the first filter group through gas transmission pipelines; the buffer tank is a diaphragm type buffer tank;
the filter system consists of a first filter group and a second filter group, and the first filter group and the second filter group consist of filters which are connected in parallel left and right; the first filter group consists of two high-efficiency filters and is used for trapping particle dust and various suspended matters above 0.5 um; the second filter group consists of two ultra-high efficiency filters and is used for trapping particle dust and various suspended matters below 0.5um, and the purification rate is 99.9995%;
the drying unit is formed by connecting two drying machines in parallel left and right and is used for drying landfill gas; inlets of a left drier and a right drier of the drier unit are respectively connected with outlets of a left filter and a right filter of the first filter unit through gas transmission pipelines; the outlets of the left drier and the right drier of the drier unit are respectively connected with the inlets of the left filter and the right filter of the second filter unit through gas transmission pipelines; the dryer is an adsorption dryer;
the heater group consists of heaters which are connected in parallel at left and right, is provided with an inlet and an outlet and is used for heating; the left and right heater inlets of the heater group are respectively connected with the outlets of the left and right filters of the second filter unit; the outlets of the left and right heaters of the heater group are connected with the separation membrane group through Y-shaped gas transmission pipelines;
the separation membrane module is a polyimide hollow fiber membrane module, and carbon dioxide, a small amount of oxygen and nitrogen can be removed by the polyimide hollow fiber membrane module to obtain a natural gas product; the polyimide hollow fiber membrane component is provided with an inlet, a natural gas outlet and a miscellaneous gas outlet; the natural gas outlet is communicated with a natural gas main pipeline;
the carbon dioxide recovery system is a carbon dioxide recovery device, and is used for purifying, liquefying, filling and preparing dry ice for the carbon dioxide removed by the separation membrane group; and the inlet of the carbon dioxide recovery device is connected with the miscellaneous gas outlet of the separation membrane group through a gas transmission pipeline.
The natural gas product using system consists of an odorizing machine, a pressure regulating metering station and a natural gas storage system; the odorizing machine is used for odorizing natural gas and ensuring the safety of transportation and use; the odorizing machine is connected with the natural gas pipeline; the pressure regulating metering station is a station for regulating the pressure of a natural gas pipeline and metering the gas flow, and is used for receiving the natural gas obtained by the separation membrane group, conveying the natural gas to a main pipeline of an urban natural gas medium-pressure pipe network through a pipeline and supplying gas to the urban natural gas medium-pressure pipe network;
the natural gas storage system consists of a natural gas compressor and a natural gas storage tank; the inlet of the natural gas compressor is connected with the natural gas outlet of the separation membrane group through the natural gas main pipeline; the outlet of the compressor is connected with the natural gas storage tank and used for storing natural gas.
In addition, gas transmission switches are arranged on gas transmission pipelines among the gas-liquid separation system, the oil removal device, the compressor, the buffer tank group, the filtering system, the drying unit, the heater group, the separation membrane group, the carbon dioxide recovery system and the natural gas product.
The working process is as follows:
the landfill gas enters a first condensate tank through a gas transmission pipeline to be dehydrated and impurity-removed to form condensate and condensate gas, the condensate is discharged along a condensate outlet of the first condensate tank, the condensate gas enters a first filtering pipeline 1 to be filtered and dried, and then the condensate gas enters a second condensate tank to be dehydrated and impurity-removed for the second time; the condensed gas after the secondary dehydration and impurity removal enters a second filtering pipeline 2 for filtering and drying, and then the condensed gas after the secondary dehydration and impurity removal enters a first booster fan for boosting pressure and heating to obtain boosted pressure gas; the obtained boosted gas is cooled and dried sequentially through the first cooler and the first steam-water separator to obtain dry gas; the obtained dry gas is subjected to secondary drying through the second steam-water separator, the obtained secondary dry gas is sent to a vulcanizing tower to remove hydrogen sulfide to obtain desulfurized gas, the desulfurized gas is sent to an adsorption tower to remove ammonia gas to obtain ammonia gas, the deaminated gas is dried and decontaminated through a third filtering pipeline 3 and then enters a third condensate tank to be subjected to third dehydration and impurity removal to obtain condensed gas, the condensed gas is subjected to secondary pressurization and temperature increase through a second booster fan to obtain secondary pressurized gas, the obtained secondary pressurized gas is subjected to third temperature reduction and drying through a second cooler and a third steam-water separator in sequence to obtain tertiary dry gas, the tertiary dry gas is deoiled through a deoiling device and then sent to a compressor unit and a buffer tank unit to be pressurized to obtain tertiary pressurized gas, the tertiary pressurized gas is sent to a first filter unit to be filtered to obtain filtered gas, sending the filter into the drying unit for fourth drying to obtain fourth drying gas, sending the fourth drying gas into a second filter group for secondary filtering to obtain secondary filtered gas, and sending the secondary filtered gas into a heater for heating to obtain heating gas; feeding the heated gas into a polyimide hollow fiber membrane module for separation, wherein the polyimide hollow fiber membrane module can remove carbon dioxide, a small amount of oxygen and nitrogen to obtain natural gas; odorizing the obtained natural gas by an odorizing device; the odorized natural gas has two use modes, one mode is that the pressure is increased through a natural gas compressor and then the odorized natural gas is stored in a natural gas storage tank; the other is that natural gas is input into a natural gas medium-pressure pipeline network through a natural gas pipeline and a fuel gas pressure regulating metering device; the separated carbon dioxide is input into a carbon dioxide recovery device for recycling.
Claims (10)
1. A landfill gas purification system, its characterized in that: the system comprises a gas-liquid separation system, an oil removal device, a compressor, a buffer tank group, a filtering system, a drying unit, a heater group, a separation membrane group, a carbon dioxide recovery system and a natural gas product using system; liquid separation system, deoiling device, compressor, buffer tank group, filtration system, drying unit, heater group, separation membrane group and natural gas product use system be linked together in proper order, the separation membrane group links to each other with carbon dioxide recovery system, filtration system includes first filter group and second filter group, drying unit sets up first filter group and second filter group between.
2. The landfill gas purification system of claim 1, wherein: the gas-liquid separation system is used for removing moisture and solid particles in the landfill gas and consists of a condensate tank group, a filtering pipeline system, a booster fan group, a steam-water separator system, a cooler group, a desulfurizing tower and an adsorption tower; the condensate tank group consists of a first condensate tank, a second condensate tank and a third condensate tank, the first condensate tank, the second condensate tank and the third condensate tank are consistent in structure, and an inlet, a condensate outlet and a condensate gas outlet are arranged; an inlet of the first condensate tank is connected with the landfill gas transmission pipeline, and a condensate gas outlet of the first condensate tank is connected with an inlet of the first filtering pipeline; an inlet of the second condensate tank is connected with an outlet of the first filtering pipeline, and a condensed gas outlet of the second condensate tank is connected with an inlet of the second filtering pipeline; an inlet of the third condensate tank is connected with an outlet of a third filtering pipeline, and a condensate gas outlet of the third condensate tank is connected with an inlet of a second booster fan through a gas pipeline;
the filtering pipeline system is used for assisting the system in dewatering and impurity removing and comprises a second filtering pipeline, a second filtering pipeline and a third filtering pipeline; the second filtering pipeline is internally provided with coarse-pore sponge filtering layers at equal intervals for assisting in removing water and impurities, the front and the back of each coarse-pore sponge filtering layer are PVC transverse grids, and coarse-pore sponge is clamped in the middle of each coarse-pore sponge filtering layer; the pipeline of the second filtering pipeline is internally provided with semicircular filtering plates which are inclined backwards at equal intervals, the inclination angle is 30-90 degrees, the semicircular filtering plates are provided with a plurality of round holes, two sides of each semicircular filtering plate are adhered with mesoporous activated carbon non-woven fabrics, and the aperture is 2-50 nm and is used for assisting in drying and impurity removal; a filtering partition is equidistantly arranged in the third filtering pipeline, blade-shaped vertical bars are equidistantly arranged on the filtering partition, a microporous activated carbon non-woven fabric is adhered to one side of each blade-shaped vertical bar, and the pore diameter is smaller than 2 nm; a middle-hole sponge layer is stuck on the other side, and the aperture is between 25 and 35 ppi; for assisting in drying and removing particulate impurities; the first filtering pipeline is connected between a condensed gas outlet of the first condensed liquid tank and an inlet of the second condensed liquid tank; the second filtering pipeline is connected between a condensed gas outlet of the second condensed liquid tank and an inlet of the first booster fan; the third filtering pipeline is connected between the outlet of the adsorption tower and the inlet of the third condensate tank;
the booster fan set consists of a first booster fan and a second booster fan; the first booster fan and the second booster fan have the same structure and are provided with inlets and outlets; used for boosting and heating the condensed gas; the inlet of the first booster fan is connected with the outlet of the second filtering pipeline, and the outlet of the first booster fan is connected with the inlet of the first cooler through a gas transmission pipeline; an inlet of the second booster fan is connected with a condensed gas outlet of the third condensed liquid tank through a gas transmission pipeline, and an outlet of the second booster fan is connected with an inlet of a second cooler;
the steam-water separator system is used for dehydration and drying and comprises a first steam-water separator, a second steam-water separator and a third steam-water separator; the first steam-water separator, the second steam-water separator and the third steam-water separator are respectively provided with an inlet, a gas outlet and a water outlet, and the gas outlet is used for discharging dehydrated dry gas; the water outlet is used for discharging the separated water; the inlet of the first steam-water separator is communicated with the outlet of the first cooler through a gas pipeline; the gas outlet of the first steam-water separator is communicated with the inlet of the second steam-water separator through a gas transmission pipeline; the gas outlet of the second steam-water separator is connected with the inlet of the vulcanizing tower through a gas pipeline; an inlet of the third steam-water separator is communicated with an outlet of the second cooler through a gas transmission pipeline; the gas outlet of the third steam-water separator is communicated with the inlet of the oil removal device through a gas transmission pipeline; the water outlets of the first steam-water separator, the second steam-water separator and the third steam-water separator are respectively connected with an external drainage pipeline; the first steam-water separator is a baffle type separator and is suitable for large gas velocity fluctuation; the second steam-water separator is an adsorption type separator and is suitable for medium gas velocity fluctuation; the third steam-water separator is a cyclone separator and is suitable for gas velocity fluctuation below the medium level;
the cooler group is used for cooling landfill gas and consists of a first air cooler and a second cooler, the first air cooler and the second cooler have the same structure and are provided with inlets and outlets; the inlet of the first cooler is connected with the outlet of the first booster fan, the outlet of the first cooler is connected with the inlet of the first steam-water separator, the inlet of the second cooler is connected with the outlet of the second booster fan, and the outlet of the second cooler is connected with the inlet of the third steam-water separator;
the desulfurizing tower comprises any one of a dry desulfurizing tower, a wet desulfurizing tower, a biological desulfurizing tower and a complex iron desulfurizing tower; the inlet of the desulfurizing tower is connected with the gas outlet of the second water-vapor separator, and the outlet of the desulfurizing tower is communicated with the inlet of the adsorption tower;
the adsorption tower is an activated carbon adsorption tower, and quicklime is put in the adsorption tower, and can remove acid penetrating fluid in landfill gas; and the outlet of the adsorption tower is communicated with the inlet of the third filtering pipeline.
3. The landfill gas purification system of claim 2, wherein: the oil removing device is used for removing grease in the landfill gas and is provided with an inlet and an outlet; an inlet of the oil removing device is communicated with a gas outlet of the third steam-water separator through a gas transmission pipeline, and an outlet of the oil removing device is communicated with an inlet of the compressor;
the compressor is a methane compressor; the inlet of the compressor is communicated with the outlet of the oil removing device through a gas transmission pipeline, and the outlet of the compressor is connected with the inlet of the buffer tank group through a three-way gas transmission pipeline.
4. The landfill gas purification system of claim 3, wherein: the buffer tank group is formed by connecting two buffer tanks in parallel left and right; the buffer tank is provided with an inlet and an outlet; the inlet of the buffer tank group is connected with the outlet of the compressor through a three-way gas transmission pipeline; outlets of a left buffer tank and a right buffer tank of the buffer tank group are respectively connected with inlets of a left filter and a right filter of the first filter group through gas transmission pipelines; the buffer tank is a diaphragm type buffer tank.
5. The landfill gas purification system of claim 4, wherein: the filter system consists of a first filter group and a second filter group, and the first filter group and the second filter group consist of filters which are connected in parallel left and right; the first filter group consists of two high-efficiency filters and is used for trapping particle dust and various suspended matters above 0.5 um; the second filter group consists of two ultra-efficient filters and is used for trapping particle dust and various suspended matters below 0.5 um.
6. The landfill gas purification system of claim 5, wherein: the drying unit is formed by connecting two drying machines in parallel left and right and is used for drying landfill gas; inlets of a left drier and a right drier of the drier unit are respectively connected with outlets of a left filter and a right filter of the first filter unit through gas transmission pipelines; the outlets of the left drier and the right drier of the drier unit are respectively connected with the inlets of the left filter and the right filter of the second filter unit through gas pipelines; the dryer is an adsorption dryer.
7. The landfill gas purification system of claim 6, wherein: the heater group consists of heaters which are connected in parallel at left and right, is provided with an inlet and an outlet and is used for heating; the left and right heater inlets of the heater group are respectively connected with the outlets of the left and right filters of the second filter unit; and the outlets of the left and right heaters of the heater group are connected with the separation membrane group through gas transmission pipelines.
8. The landfill gas purification system of claim 7, wherein: the separation membrane module is a polyimide hollow fiber membrane module; the polyimide hollow fiber membrane component is provided with an inlet, a natural gas outlet and a miscellaneous gas outlet; the natural gas outlet is communicated with a natural gas main pipeline.
9. The landfill gas purification system of claim 8, wherein: the carbon dioxide recovery system is a carbon dioxide recovery device; and the inlet of the carbon dioxide recovery device is connected with the miscellaneous gas outlet of the separation membrane group through a gas transmission pipeline.
10. The landfill gas purification system of claim 9, wherein: the natural gas storage system consists of a natural gas compressor and a natural gas storage tank; the inlet of the natural gas compressor is connected with the natural gas outlet of the separation membrane group through the natural gas main pipeline; the outlet of the compressor is connected with the natural gas storage tank and used for storing natural gas.
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| CN113513300A (en) * | 2021-08-20 | 2021-10-19 | 西南石油大学 | Gas filtering device for injection-production integrated wellhead |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113513300A (en) * | 2021-08-20 | 2021-10-19 | 西南石油大学 | Gas filtering device for injection-production integrated wellhead |
| CN113513300B (en) * | 2021-08-20 | 2022-12-13 | 西南石油大学 | Gas filtering device for injection-production integrated wellhead |
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