CN107858184A - A kind of landfill gas purification produces the method and system of natural gas - Google Patents
A kind of landfill gas purification produces the method and system of natural gas Download PDFInfo
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- CN107858184A CN107858184A CN201711329380.3A CN201711329380A CN107858184A CN 107858184 A CN107858184 A CN 107858184A CN 201711329380 A CN201711329380 A CN 201711329380A CN 107858184 A CN107858184 A CN 107858184A
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- 239000007789 gas Substances 0.000 title claims abstract description 156
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000000746 purification Methods 0.000 title claims abstract description 14
- 239000003345 natural gas Substances 0.000 title claims abstract description 12
- 238000001914 filtration Methods 0.000 claims abstract description 37
- 239000012535 impurity Substances 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 25
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 239000004642 Polyimide Substances 0.000 claims abstract description 17
- 239000012510 hollow fiber Substances 0.000 claims abstract description 17
- 229920001721 polyimide Polymers 0.000 claims abstract description 17
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims abstract description 15
- 229920002521 macromolecule Polymers 0.000 claims abstract description 14
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 12
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 11
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 11
- 239000004571 lime Substances 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims abstract description 4
- 238000001556 precipitation Methods 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 29
- 230000003009 desulfurizing effect Effects 0.000 claims description 26
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 22
- 238000004891 communication Methods 0.000 claims description 21
- 239000012530 fluid Substances 0.000 claims description 18
- 238000001179 sorption measurement Methods 0.000 claims description 12
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 11
- 239000001569 carbon dioxide Substances 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 235000009508 confectionery Nutrition 0.000 claims description 8
- 230000009615 deamination Effects 0.000 claims description 8
- 238000006481 deamination reaction Methods 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 230000008595 infiltration Effects 0.000 claims description 5
- 238000001764 infiltration Methods 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 239000003463 adsorbent Substances 0.000 claims description 4
- 239000003054 catalyst Substances 0.000 claims description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 4
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical group O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 4
- 238000011175 product filtration Methods 0.000 claims description 2
- 239000004952 Polyamide Substances 0.000 claims 1
- 150000001412 amines Chemical class 0.000 claims 1
- 239000000835 fiber Substances 0.000 claims 1
- 239000012528 membrane Substances 0.000 claims 1
- 229920002647 polyamide Polymers 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000003139 buffering effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000010813 municipal solid waste Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 101100369074 Tuber dryophilum TDF-1 gene Proteins 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical class ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 150000003949 imides Chemical class 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920002627 poly(phosphazenes) Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- -1 siloxanes Chemical class 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/102—Removal of contaminants of acid contaminants
- C10L3/103—Sulfur containing contaminants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/102—Removal of contaminants of acid contaminants
- C10L3/104—Carbon dioxide
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/106—Removal of contaminants of water
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
- C10L2290/547—Filtration for separating fractions, components or impurities during preparation or upgrading of a fuel
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
- C10L2290/548—Membrane- or permeation-treatment for separating fractions, components or impurities during preparation or upgrading of a fuel
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention discloses the method and system that a kind of landfill gas purification produces natural gas, this method includes：Will landfill pneumatic transmission lime set tank carry out precipitation removal of impurities processing, boosting, heating, cooling, drying, removing hydrogen sulfide, cooling, drying, removing ammonia, the first filtering, buffering, boosting, the second filtering, cooling, dry, the 3rd filtering, heating, the separation of macromolecule Polyimide Hollow Fiber group, obtain gas product.The method and system of the present invention adapts to the complicated composition of landfill gas, it is possible to increase operation stability and methane recovery, reduces system energy consumption.
Description
Technical field
The present invention relates to regenerative resource recovery technology field, and in particular to a kind of landfill gas purification produces natural gas
Method and system.
Background technology
Landfill gas results from garbage sanitary filling field, is the product in rubbish after organic principle degraded, and its composition mainly wraps
Include CH4And CO2, wherein methane content about 55% or so carbon dioxide content about 35% or so, is both a kind of greenhouse gases, is again
A kind of reproducible clean energy resource.The major way of current utilization of LFG is used as boiler oil, generates electricity, produces the side such as natural gas
Formula, wherein producing gas product most social benefit, environmental benefit and economic benefit.
Landfill gas is different from general biogas, in addition to containing vapor, hydrogen sulfide impurities gas, while also containing micro
Carbon monoxide, ammonia, mercaptan, siloxanes, vinyl chloride, toluene, chloromethanes, dimethylbenzene etc. and the impurity such as dust, different geographical
The landfill gas composition of Different climate condition also has difference.Though conventional biogas piece-rate system can remove the sulphur in biogas at present
Change hydrogen, but be difficult to remove micro constitutent complicated in landfill gas, cause piece-rate system separative efficiency to decay rapidly, methane purity drop
Low, the problems such as system operation is unstable, so as to limit application of the technology in landfill gas field.Though in addition, prior art energy
Methane in sewage gas is separated with carbon dioxide, but portion of methane is diffused with carbon dioxide in separation process, system
Methane recovery is not high, causes the waste in resource.
The content of the invention
It is of the invention it is an object of the invention to provide the method and system that a kind of landfill gas purification produces natural gas
Method and system adapts to the complicated composition of landfill gas, it is possible to increase operation stability and methane recovery, reduces system energy consumption.
To achieve the above object, the present invention provides a kind of method that landfill gas purification produces natural gas, this method bag
Include：
Landfill pneumatic transmission lime set tank is subjected to precipitation removal of impurities processing, to remove mixed solid-state and liquid impurities in landfill gas,
Obtain condensate liquid and condensing gas；Wherein, the pressure of the landfill gas is -30-4kPa, and temperature is -20-45 DEG C, and methane content is
45-60 volume %, carbon dioxide content are 30-40 volume %, and oxygen content is 0-2 volume %, hydrogen sulfide content 0-
1000mg/m3, ammonia level 0-500mg/m3, vapor content is 0-9.8 volume %, preferably 6.0-9.8 volumes %, impurity
For solia particle and liquid particle (particulate refers to that particle diameter is more than or equal to 1 micron of particle), impurity content 0-50g/m3；It is described
The vapor content of condensing gas is 0-8.1 volume %, preferably 5.0-8.1 volumes %, impurity content 0-5g/m3；Landfill gas passes through
The solid-state and liquid impurities crossed in lime set tank removal landfill gas, can also effectively prevent landfill gas from surprisingly causing to ooze drip during collecting
Liquid, which enters in system, causes device damage；
Gained condensing gas feeding blower fan is boosted and heated up, obtains the first boosting gas；Wherein, the temperature of the first boosting gas
Spend for -10-85 DEG C, pressure 0-15kPa；
Gained boosting gas is passed sequentially through into cooler and gas-liquid separator carries out drop gently dried, obtains the first drying gas；
Wherein, the described first temperature for drying gas is -10-50 DEG C, and vapor content is 0-7.5 volume %, preferably 4.4-7.5 bodies
Product %；
Gained drying pneumatic transmission is entered into desulfurizing tower and carries out removing hydrogen sulfide, obtains sweet gas, wherein, the hydrogen sulfide of sweet gas contains
Amount is less than 3mg/m3；
Gained sweet gas is sent into the first cooling driers and carries out drop gently dried, obtains the second drying gas, wherein, described second
The temperature for drying gas is -10-37 DEG C, and vapor content is 0-5.8 volume %, preferably 2.7-5.8 volumes %；Landfill gas water content
Greatly, humidity is high, if the moisture that can reliably remove in landfill gas is the key of system stable operation.Invention is using multistage dry
Dry water removal, it can effectively avoid, because the water removal of some link is not smooth, damaging equipment, influenceing system stable operation.
Gained second is dried into pneumatic transmission enter adsorption tower and carry out removing ammonia, obtain deamination gas, wherein, ammonia in the deamination gas
Content is less than 1mg/m3；
Gained deamination pneumatic transmission is entered into first filter and carries out the first filtering, first is obtained and crosses air filtration, wherein, first filter
Filtering accuracy is not more than 3 μm；
Gained is crossed into air filtration and passes sequentially through surge tank and compressor boosting, obtains the second boosting gas, the second boosting gas
Pressure be 1.2-1.6MPa；
The gas that boosts of gained second is subjected to the second filtering into the second filter, second is obtained and crosses air filtration, wherein, described the
The filtering accuracy of tow filtrator is not more than 1 μm；
The pneumatic transmission that boosts of gained second is entered the second cooling driers and carries out drop gently dried, obtains the 3rd drying gas, wherein, it is described
3rd temperature for drying gas is 0-25 DEG C, and vapor content is 0-0.1 volumes %；
The drying pneumatic transmission of gained the 3rd is entered into the 3rd filter and carries out the 3rd filtering, the 3rd is obtained and crosses air filtration, wherein, described the
The filtering accuracy of three filters is not more than 0.01 μm；
The filtering pneumatic transmission of gained the 3rd is entered into heater to be heated up, obtains the gas that heats up；Wherein, the temperature of the heating gas is
40-65℃；
Gained heating pneumatic transmission is entered into the separation of macromolecule Polyimide Hollow Fiber group, obtains gas product and infiltration
Gas.Macromolecule Polyimide Hollow Fiber group can carbon dioxide removal, a small amount of oxygen, nitrogen, obtain gas product, carry
Natural gas high calorific power is not less than 31.4MJ/m after pure3, total sulfur content is not more than 60mg/m3, hydrogen sulfide content is not more than 6mg/
m3, carbon dioxide content is no more than 2%.
Optionally, methods described also includes：Will part products obtained therefrom gas and part gained heating gas return the desulfurizing tower,
And part gained infiltration gas is returned into the surge tank.
Optionally, the condition of the desulfurizing tower includes：Temperature is -30-70 DEG C, air speed 20-1000h-1, pressure 0-
0.02MPa, catalyst are ferric oxide desulfurizer.
Optionally, the adsorbent in the adsorption tower is activated carbon.
The present invention also provides the system that a kind of landfill gas purification produces natural gas, and the system includes：
Lime set tank, it is provided with landfill gas entrance, condensate outlet and condensing gas outlet；
Blower fan, it is provided with air inlet and air outlet, the condensing gas communication of the air inlet and lime set tank；
Cooler, is provided with entrance and exit, and the air outlet of the entrance of the cooler and the blower fan is in fluid communication；
Gas-liquid separator, is provided with entrance, gas vent and liquid outlet, the entrance of the gas-liquid separator with it is described cold
But device communication；
Desulfurizing tower, it is provided with entrance and exit, the gas outlet stream of the desulfurizing tower entrance and the gas-liquid separator
Connection；
First cooling driers, it is provided with entrance and exit, the entrance of first cooling driers and the outlet stream of the desulfurizing tower
Body connects；
Adsorption tower, is provided with entrance and exit, and the outlet fluid of the entrance of the adsorption tower and first cooling driers connects
It is logical；
First filter, it is provided with entrance and exit, the outlet stream of the entrance of the first filter and the adsorption tower
Body connects, and the first filter filtering accuracy is not more than 3 μm；
Surge tank, is provided with entrance and exit, and the entrance of the surge tank and the outlet fluid of the first filter connect
It is logical；
Compressor, it is provided with entrance and exit, the communication of the entrance of the compressor and the surge tank；
Second filter, it is provided with entrance and exit, the entrance of second filter and the outlet stream of the compressor
Body connects, and the filtering accuracy of second filter is not more than 1 μm；
Second cooling driers, it is provided with entrance and exit, the entrance of second cooling driers and going out for second filter
Mouth is in fluid communication；
3rd filter, it is provided with entrance and exit, the 3rd entrance of filter and going out for second cooling driers
Mouth is in fluid communication, and the filtering accuracy of the 3rd filter is not more than 0.01 μm；
Heater, is provided with entrance and exit, and the outlet fluid of the entrance of the heater and the 3rd filter connects
It is logical；
Macromolecule Polyimide Hollow Fiber group, it is provided with entrance, gas product outlet and oozes vent outlet, it is described
Macromolecule Polyimide Hollow Fiber group entrance is in fluid communication with the heater outlet.
Optionally, the drainer includes tank body, air compressor and pressure difference liquid level sensor, the landfill gas entrance and
Condensing gas outlet is arranged at tank body top, and the condensate outlet is arranged at tank base, and the condensate outlet is provided with gas
Dynamic stop valve, the pneumatic stopping valve provide origin by the air compressor, and the pressure difference liquid level sensor is arranged at described
Tank wall and it is connected with the pneumatic stopping valve signal.Lime set tank can set self-draining arrangement, can effectively prevent landfill gas
Surprisingly cause Leachate site to enter in system during collecting and cause device damage.Conventional Auto-drainage mode is ball float draining, is led to
Cross floater seal osculum, osculum typically circulates aperture all very littles, and after liquid level rise, ball float floats, and sewage is flowed by gap
Go out.Landfill gas contains more granule foreign, it is easy to blocks osculum, manual cleaning trouble, easily causes impeded drainage.This hair
Bright Auto-drainage uses compressed air as power, by pressure difference induction level height, realizes draining by pneumatic stopping valve, avoids
Because particle is more in water, the problems such as blocking osculum.
Optionally, the heater outlet is in fluid communication with the desulfurizing tower entrance, and the polyphosphazene polymer acid imide is hollow
Gas product outlet and the desulfurizing tower entrance of tunica fibrosa group are in fluid communication, the macromolecule Polyimide Hollow Fiber
The entrance for oozing vent outlet and the surge tank of group is in fluid communication.
Optionally, between the heater outlet and the desulfurizing tower entrance, macromolecule Polyimide Hollow Fiber group
Gas product outlet the desulfurizing tower entrance between and the macromolecule Polyimide Hollow Fiber group infiltration
Gas exports is provided with valve and gas composition sensor between the entrance of the surge tank, the gas composition sensor with
The valve signal connection.During landfill gas separating-purifying, portion of methane gas can be mixed with the carbon dioxide isolated
Body, such as directly discharge can cause the reduction of methane recovery.In addition, in first start process or during non-steady state,
Gas not up to standard directly discharge also results in the loss of methane.The present invention passes through before film group is entered, product gas outlet and film
Group oozes vent outlet and sets backflow at three, realizes that process gas returns automatically by the interlocking of gas composition sensor signal and valve
It is fluent to use, methane losses are effectively reduced, methane recovery brings up to more than 96%.
The invention has the advantages that：
The present invention use multistage purification technology, outside vulcanisation hydrogen, can also prevent various trace impurity removings in landfill gas
The problems such as system energy consumption caused by film group performance degradation raises, makings is not up to standard.
The present invention uses macromolecule Polyimide Hollow Fiber group purification technique, and system starts soon, in 10 minutes
Output qualified products gas, be suitable for the characteristics of fluctuation of landfill gas tolerance is big, automaticity is high, and trouble point is few, it is stable can
Lean on.
The present invention is directed to the characteristics of landfill gas makings is unstable, increases newly than traditional handicraft and is flowed back at two, in landfill gas makings
In the case of fluctuation, the stability of operation and higher methane recovery can be also realized.
The inventive method flow is succinct, and device integration is high, and noise is small, and compared to other techniques, it is small to be easy to implement equipment
Type, removableization.
The inventive method is applicable not only to rubbish landfill gas purification preparing natural gas, and other for being also applied for complicated component are various
Biogas.
Brief description of the drawings
Fig. 1 includes a kind of schematic flow sheet of embodiment of the inventive method, also including a kind of tool of present system
The structural representation of body embodiment.
Embodiment
Following examples are used to illustrate the present invention, but are not limited to the scope of the present invention.
Embodiment 1
Landfill gas charge flow rate is 1440Nm3/ h, pressure are -10kPa, and temperature is 40 DEG C, and main component is：Methane 48.2
Volume %, the volume % of carbon dioxide 38.8, oxygen 0.9 volume %, hydrogen sulfide 720mg/m3, ammonia 280mg/m3, water content is
8.1 volume %, impurity are solia particle and liquid particle, impurity content 17g/m3。
Landfill pneumatic transmission lime set tank is subjected to condensation process, to remove the water and impurity in landfill gas, obtains condensate liquid and cold
Solidifying gas；The water content of the condensing gas is 7.9 volume %, impurity content 1g/m3；
After condensing gas is boosted into 12kPa by blower fan, temperature is increased to 60 DEG C, the 10kPa after cooler cools, 50 DEG C
Enter after gas-liquid separator isolates the first drying gas and enter desulfurizing tower, the first temperature for drying gas is 50 DEG C, and water content is 7.5 bodies
Product %.First dries gas after desulfurizing tower, and hydrogen sulfide content is reduced to 1mg/m3, the condition of desulfurizing tower includes：Temperature is 50
DEG C, air speed 167h-1, pressure 0.01MPa, catalyst is ferric oxide desulfurizer (commercial grades HD-1)；
Sweet gas enters the first cooling driers, and temperature is reduced to 36.7 DEG C, and water content is 5.7 volume %；Gas is dried by second
After adsorption tower (using activated carbon as adsorbent, commercial grades TDF-1) removal of impurities, ammonia level is reduced to 0.1mg/m3,
Gained deamination gas is entered into surge tank, surge tank gas pressure 5kPa, temperature after first filter (filtering accuracy is 3 μm) removal of impurities
37.6 DEG C of degree, for compressor by after gas compression to 1.43MPa, the boosting gas of gained second passes through the second filter (the second filter
Filtering accuracy be 1 μm) enter the second cooling driers, the second 24.1 DEG C of cooling driers outlet temperature, water content is 0.09 volume %, pass through
After 3rd filter (filtering accuracy of the 3rd filter is 0.01 μm) removal of impurities, landfill gas is heated to 45 DEG C and enters height by heater
Molecule Polyimide Hollow Fiber group.After the purification of film group, the volume % of methane purity 91.4 in gas product is obtained, two
Content of carbon oxide 1.7 volume %, total sulfur content 55mg/m3, hydrogen sulfide content 5mg/m3, methane recovery 96%.
Embodiment 2
Landfill gas charge flow rate is 860Nm3/ h, pressure are -15kPa, and temperature is 37 DEG C, and main component is：Methane 52.9
Weight %, the weight % of carbon dioxide 35.8, oxygen 0.4 weight %, hydrogen sulfide 560mg/m3, ammonia 130mg/m3, water content is
8.0 volume %, impurity are solia particle and liquid particle, impurity content 13g/m3。
Landfill pneumatic transmission lime set tank is subjected to condensation process, to remove the water and impurity in landfill gas, obtains condensate liquid and cold
Solidifying gas；The water content of the condensing gas is 7.7 volume %, impurity content 1g/m3；
After condensing gas is boosted into 12kPa by blower fan, temperature is increased to 57 DEG C, the 10kPa after cooler cools, 50 DEG C
Enter after gas-liquid separator isolates the first drying gas and enter desulfurizing tower, the first temperature for drying gas is 50 DEG C, and water content is 7.5 bodies
Product %.First dries gas after desulfurizing tower, and hydrogen sulfide content is reduced to 1mg/m3, the condition of desulfurizing tower includes：Temperature is 50
DEG C, air speed 100h-1, pressure 0.01MPa, catalyst is ferric oxide desulfurizer (commercial grades HD-1)；
Sweet gas enters the first cooling driers, and temperature is reduced to 36.7 DEG C, and water content is 5.7 volume %；Gas is dried by second
After adsorption tower (using activated carbon as adsorbent, commercial grades TDF-1) removal of impurities, ammonia level is reduced to 0.1mg/m3,
Gained deamination gas is entered into surge tank, surge tank gas pressure 6kPa, temperature after first filter (filtering accuracy is 3 μm) removal of impurities
34.5 DEG C of degree, for compressor by after gas compression to 1.41MPa, the boosting gas of gained second passes through the second filter (the second filter
Filtering accuracy be 1 μm) enter the second cooling driers, the second 22.1 DEG C of cooling driers outlet temperature, water content is 0.08 volume %, pass through
After 3rd filter (filtering accuracy of the 3rd filter is 0.01 μm) removal of impurities, landfill gas is heated to 45 DEG C and enters height by heater
Molecule Polyimide Hollow Fiber group.After the purification of film group, the volume % of methane purity 92.5, titanium dioxide in gas product
Carbon content 1.5 volume %, total sulfur content 40mg/m3, hydrogen sulfide content 4mg/m3, methane recovery 97%.
Although above with general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention, belong to the scope of protection of present invention.
Claims (8)
1. a kind of method that landfill gas purification produces natural gas, it is characterised in that this method includes：
Landfill pneumatic transmission lime set tank is subjected to precipitation removal of impurities processing, to remove mixed solid-state and liquid impurities in landfill gas, obtained
Condensate liquid and condensing gas；Wherein, the pressure of the landfill gas is -30-4kPa, and temperature is -20-45 DEG C, methane content 45-60
Volume %, carbon dioxide content are 30-40 volume %, and oxygen content is 0-2 volume %, hydrogen sulfide content 0-1000mg/m3,
Ammonia level is 0-500mg/m3, vapor content is 0-9.8 volume %, and impurity is solia particle and liquid particle, impurity content
For 0-50g/m3；The vapor content of the condensing gas is 0-8.1 volume %, impurity content 0-5g/m3；
Gained condensing gas feeding blower fan is boosted and heated up, obtains the first boosting gas；Wherein, the temperature of the first boosting gas
For -10-85 DEG C, pressure 0-15kPa；
Gained boosting gas is passed sequentially through into cooler and gas-liquid separator carries out drop gently dried, obtains the first drying gas；Wherein,
Described first temperature for drying gas is -10-50 DEG C, and vapor content is 0-7.5 volumes %；
Gained drying pneumatic transmission is entered into desulfurizing tower and carries out removing hydrogen sulfide, obtains sweet gas, wherein, the hydrogen sulfide content of sweet gas is small
In 3mg/m3；
Gained sweet gas is sent into the first cooling driers and carries out drop gently dried, obtains the second drying gas, wherein, described second dries
The temperature of gas is-10-37 DEG C, and vapor content is 0-5.8 volumes %；
Gained second is dried into pneumatic transmission enter adsorption tower and carry out removing ammonia, obtain deamination gas, wherein, ammonia content in the deamination gas
Less than 1mg/m3；
Gained deamination pneumatic transmission is entered into first filter and carries out the first filtering, first is obtained and crosses air filtration, wherein, first filter filtering
Precision is not more than 3 μm；
Gained is crossed into air filtration and passes sequentially through surge tank and compressor boosting, obtains the second boosting gas, the pressure of the second boosting gas
Power is 1.2-1.6MPa；
By gained second boost gas into the second filter carry out second filtering, obtain second cross air filtration, wherein, second mistake
The filtering accuracy of filter is not more than 1 μm；
The pneumatic transmission that boosts of gained second is entered the second cooling driers and carries out drop gently dried, obtains the 3rd drying gas, wherein, the described 3rd
The temperature for drying gas is 0-25 DEG C, and vapor content is 0-0.1 volumes %；
The drying pneumatic transmission of gained the 3rd is entered into the 3rd filter and carries out the 3rd filtering, the 3rd is obtained and crosses air filtration, wherein, the 3rd mistake
The filtering accuracy of filter is not more than 0.01 μm；
The filtering pneumatic transmission of gained the 3rd is entered into heater to be heated up, obtains the gas that heats up；Wherein, the temperature of the heating gas is 40-
65℃；
Gained heating pneumatic transmission is entered into the separation of macromolecule Polyimide Hollow Fiber group, obtains gas product and infiltration gas.
2. according to the method for claim 1, it is characterised in that methods described also includes：By part products obtained therefrom gas and portion
Heating gas obtained by point returns to the desulfurizing tower and will return to the surge tank by infiltration gas obtained by part.
3. according to the method for claim 1, it is characterised in that the condition of the desulfurizing tower includes：Temperature is -30-70 DEG C,
Air speed is 20-1000h-1, pressure 0-0.02MPa, catalyst is ferric oxide desulfurizer.
4. according to the method for claim 1, it is characterised in that the adsorbent in the adsorption tower is activated carbon.
5. the system that a kind of landfill gas purification produces natural gas, it is characterised in that the system includes：
Lime set tank, it is provided with landfill gas entrance, condensate outlet and condensing gas outlet；
Blower fan, it is provided with air inlet and air outlet, the condensing gas communication of the air inlet and lime set tank；
Cooler, is provided with entrance and exit, and the air outlet of the entrance of the cooler and the blower fan is in fluid communication；
Gas-liquid separator, it is provided with entrance, gas vent and liquid outlet, the entrance of the gas-liquid separator and the cooler
Communication；
Desulfurizing tower, is provided with entrance and exit, and the desulfurizing tower entrance connects with the gas outlet stream of the gas-liquid separator；
First cooling driers, are provided with entrance and exit, and the entrance of first cooling driers connects with the outlet fluid of the desulfurizing tower
It is logical；
Adsorption tower, it is provided with entrance and exit, the communication of the entrance of the adsorption tower and first cooling driers；
First filter, is provided with entrance and exit, and the outlet fluid of the entrance of the first filter and the adsorption tower connects
Logical, the first filter filtering accuracy is not more than 3 μm；
Surge tank, it is provided with entrance and exit, the entrance of the surge tank and the communication of the first filter；
Compressor, it is provided with entrance and exit, the communication of the entrance of the compressor and the surge tank；
Second filter, is provided with entrance and exit, and the entrance of second filter connects with the outlet fluid of the compressor
Logical, the filtering accuracy of second filter is not more than 1 μm；
Second cooling driers, it is provided with entrance and exit, the outlet stream of the entrance of second cooling driers and second filter
Body connects；
3rd filter, it is provided with entrance and exit, the entrance of the 3rd filter and the outlet stream of second cooling driers
Body connects, and the filtering accuracy of the 3rd filter is not more than 0.01 μm；
Heater, it is provided with entrance and exit, the communication of the entrance of the heater and the 3rd filter；
Macromolecule Polyimide Hollow Fiber group, it is provided with entrance, gas product outlet and oozes vent outlet, the high score
Sub- Polyimide Hollow Fiber group entrance is in fluid communication with the heater outlet.
6. system according to claim 5, wherein, the drainer includes tank body, air compressor and pressure difference liquid level and passed
Sensor, landfill gas entrance and the condensing gas outlet are arranged at tank body top, and the condensate outlet is arranged at tank base, institute
State condensate outlet and be provided with pneumatic stopping valve, the pneumatic stopping valve provides origin, the pressure difference by the air compressor
Liquid level sensor is arranged at the tank wall and is connected with the pneumatic diaphragm valve signal.
7. system according to claim 5, wherein, the heater outlet is in fluid communication with the desulfurizing tower entrance, institute
The gas product outlet for stating macromolecule Polyimide Hollow Fiber group is in fluid communication with the desulfurizing tower entrance, the high score
The entrance for oozing vent outlet and the surge tank of sub- Polyimide Hollow Fiber group is in fluid communication.
8. system according to claim 7, wherein, between the heater outlet and the desulfurizing tower entrance, macromolecule
Between the gas product outlet of Polyimide Hollow Fiber group and the desulfurizing tower entrance and the macromolecule polyamides is sub-
Valve and gas composition sensor are provided between the entrance for oozing vent outlet and the surge tank of amine hollow-fibre membrane group,
The gas composition sensor is connected with the valve signal.
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