CN203990238U - Rubbish landfill gas separating-purifying device - Google Patents

Rubbish landfill gas separating-purifying device Download PDF

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Publication number
CN203990238U
CN203990238U CN201420485397.3U CN201420485397U CN203990238U CN 203990238 U CN203990238 U CN 203990238U CN 201420485397 U CN201420485397 U CN 201420485397U CN 203990238 U CN203990238 U CN 203990238U
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gas
flash column
carbon dioxide
methane
pressure
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CN201420485397.3U
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郗春满
朱云华
李辉
郭正军
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Suzhou Sujing Protective Atmosphere Co ltd
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Suzhou Sujing Protective Atmosphere Co ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/151Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

The utility model relates to a kind of rubbish landfill gas separating-purifying device, comprises the absorption tower, methane dewater unit, methane pressure-swing absorption apparatus, flash column, carbon dioxide dehydration device, the carbon dioxide pressure-swing absorption apparatus that are provided with methyldiethanolamine solution; The air inlet of absorption tower hypomere is connected with raw material source of the gas, and the gas outlet of absorption tower epimere connects methane dewater unit and methane pressure-swing absorption apparatus successively; The liquid outlet of absorption tower hypomere connects flash column, carbon dioxide dehydration device, carbon dioxide pressure-swing absorption apparatus successively.Device of the present utility model can carry out separating-purifying to rubbish landfill gas, reclaims carbon dioxide and methane simultaneously, thereby reduces on the one hand discharge, the protection of the environment of greenhouse gases, can improve on the other hand the purity of gas, is conducive to the utilization to it.

Description

Rubbish landfill gas separating-purifying device
Technical field
The utility model relates to one rubbish landfill gas is carried out to separating-purifying, is convenient to obtain methane gas and the carbon dioxide that purity is higher the rubbish landfill gas separating-purifying device utilizing.
Background technology
In today of 21 century, the mankind are faced with two serious environmental problem challenges, are waste management problems on the one hand, are greenhouse effects aggravation problem on the other hand.
Conventional domestic rubbish disposal mode has: (1) sanitary landfills; (2) Composting treatment; (3) burning disposal.Wherein sanitary landfills is the major way of processing domestic waste.At present, China has more than 80% house refuse to take the processing of sanitary landfills mode.The constituent of the rubbish landfill gas that garbage loading embeading produces is carbon dioxide, methane, nitrogen, oxygen, ammonia, hydrogen sulfide and other organic gas.This rubbish landfill gas is a kind of potential clean energy resource, and its calorific value is generally 7450 ~ 22350KJ/m 3, CO is removed in dehydration 2after impurity composition, calorific value further can be improved, reach or approach the calorific value of natural gas.In typical rubbish landfill gas, methane content is about 45% ~ 55%, and carbon dioxide content is about 40% ~ 55%.If directly discharging, rubbish landfill gas can produce stronger greenhouse effects.According to statistics, in some developed countries such as the U.S., Germany, refuse landfill has become first greenhouse gas emission source.But current most of cleaning equipment is only purified to the methane in rubbish landfill gas, and carbon dioxide is treated as waste gas and is drained in atmosphere, aggravation greenhouse effects.
The patent of invention that for example patent No. is ZL200410081272.5, it has adopted the integrated technique of desulfurization, freezing separatory, Temp .-changing adsorption, the pressure-variable adsorption methane of purifying from rubbish landfill gas, this process using low-temperature operation, energy consumption is high, investment is large, and cannot further remove the O in rubbish landfill gas 2, cause gas product methane purity low, be only 80%~90%.The patent No. is the patent of invention of ZL200510004873.0, it compresses landfill gas, freeze drying, multistage filtering, after adsorption dry, then carries out High Pressure Absorption, co-current and pressure equalization, the pressure-variable adsorption circulation technology of normal pressure regeneration, gas product methane purity 96% left and right, but it remains only for methane gas.The patent No. is the patent of invention of ZL200910085020.2, and it carries out desulfurization, one-level pressure-variable adsorption, Temp .-changing adsorption, secondary pressure-variable adsorption to rubbish landfill gas and produces methane, but cannot obtain highly purified CO 2.
If rubbish landfill gas is carried out to separating-purifying, can reclaim carbon dioxide and methane, thereby protection of the environment realizes utilization of waste as resource simultaneously simultaneously, this is at energy growing tension, advocate thriftiness and especially have today of type society realistic meaning energetically.
Summary of the invention
The purpose of this utility model is to provide one and can purifies simultaneously and reclaim carbon dioxide and methane, thereby is convenient to the rubbish landfill gas separating-purifying device of its utilization.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of rubbish landfill gas separating-purifying device, comprises the absorption tower, methane dewater unit, methane pressure-swing absorption apparatus, flash column, carbon dioxide dehydration device, the carbon dioxide pressure-swing absorption apparatus that are provided with methyldiethanolamine solution;
Described absorption tower comprises absorption tower epimere and absorption tower hypomere; The air inlet of described absorption tower hypomere is connected with raw material source of the gas, the air inlet of described methane dewater unit is connected with the gas outlet that described absorption tower epimere pushes up, and the gas outlet of described methane dewater unit is connected with the air inlet of described methane pressure-swing absorption apparatus; Described methane pressure-swing absorption apparatus has methane product gas gas outlet and tail gas gas outlet;
Described flash column comprises flash column epimere and flash column hypomere; Liquid outlet at the bottom of described absorption tower hypomere is connected with the inlet of described flash column hypomere, liquid outlet at the bottom of described flash column hypomere is connected with the inlet of described flash column epimere, and the liquid outlet at the bottom of described flash column epimere is connected with the inlet that described absorption tower hypomere pushes up; Described flash column hypomere top has waste gas outlet, the gas outlet that described flash column epimere pushes up is connected with the air inlet of described carbon dioxide dehydration device, the gas outlet of described carbon dioxide dehydration device is connected with the air inlet of described carbon dioxide pressure-swing absorption apparatus, and described carbon dioxide pressure-swing absorption apparatus has gas product gas outlet and tail gas gas outlet.
Preferably, it also comprises regenerator, liquid outlet at the bottom of described flash column epimere is also connected with the inlet of described regenerator, liquid outlet at the bottom of described regenerator is connected with the inlet on the described absorption section of costing top, and the gas outlet of described regeneration overhead is connected with the air inlet at the bottom of described flash column epimere.
Preferably, the liquid outlet at the bottom of described regenerator is connected with the inlet that the described absorption section of costing is pushed up after cooler.
Preferably, the gas outlet on described flash column epimere top is connected with the air inlet of described carbon dioxide dehydration device after cooling driers, and the condensation-water drain of described cooling driers returns and is connected to described flash column epimere top and described flash column hypomere pushes up.
Preferably, it also comprises desulfurizing tower, and the air inlet of described desulfurizing tower is connected with raw material source of the gas, and the gas outlet of described desulfurizing tower is connected with the air inlet of described absorption tower hypomere.
Preferably, between described carbon dioxide dehydration device and described carbon dioxide pressure-swing absorption apparatus, between described methane dewater unit and described methane pressure-swing absorption apparatus, be respectively arranged with surge tank.
Preferably, described methane pressure-swing absorption apparatus is the pressure-swing absorption apparatus of at least four towers; Described carbon dioxide pressure-swing absorption apparatus is the pressure-swing absorption apparatus of at least two towers.
Because technique scheme is used; the utility model compared with prior art has following advantages: device of the present utility model can carry out separating-purifying to rubbish landfill gas; reclaim carbon dioxide and methane simultaneously; thereby reduce on the one hand discharge, the protection of the environment of greenhouse gases; the purity that can improve on the other hand gas, is conducive to the utilization to it.
Brief description of the drawings
Accompanying drawing 1 is the schematic diagram of rubbish landfill gas separating-purifying device of the present utility model.
The flow chart of the technique that accompanying drawing 2 adopts for rubbish landfill gas separating-purifying device of the present utility model.
In above accompanying drawing: 1, compressor; 2, desulfurizing tower; 3, absorption tower; 4, flash column; 5, cooling driers; 6, regenerator; 7, cooler; 8, carbon dioxide dehydration device; 9, surge tank; 10, carbon dioxide pressure-swing absorption apparatus; 11, methane dewater unit; 12, methane pressure-swing absorption apparatus; 13, the tail gas outlet of carbon dioxide dehydration device; 14, the tail gas of methane dewater unit outlet; 15, the tail gas gas outlet of carbon dioxide pressure-swing absorption apparatus; 16, the tail gas gas outlet of methane pressure-swing absorption apparatus; 17, carbon dioxide product gas; 18, methane product gas.
Detailed description of the invention
Below in conjunction with embodiment shown in the drawings, the utility model is further described.
Embodiment mono-: shown in accompanying drawing 1, the path of wider threads bar express liquid in this accompanying drawing, and narrower lines represent the path of gas.A kind of rubbish landfill gas separating-purifying device, comprises desulfurizing tower 2, is provided with absorption tower 3, methane dewater unit 11, methane pressure-swing absorption apparatus 12, flash column 4, regenerator 6, carbon dioxide dehydration device 8, the carbon dioxide pressure-swing absorption apparatus 10 of methyldiethanolamine solution.
Raw material source of the gas is connected with the air inlet of desulfurizing tower 2 bottoms through compressor 1, is provided with desulfurizing agent in desulfurizing tower 2, and desulfurizing agent is that active carbon and iron oxide meet desulfurizing agent, and wherein the volume ratio of active carbon and iron oxide is 1:2 ~ 1:11.
Absorption tower 3 comprises absorption tower epimere and absorption tower hypomere, and it adopts material filling type structure, and absorption tower epimere top and absorption tower hypomere top are respectively arranged with inlet, are provided with liquid outlet and air inlet at the bottom of the hypomere of absorption tower, and epimere top in absorption tower is provided with gas outlet.The gas outlet at desulfurizing tower 2 tops is connected with the air inlet at the bottom of the hypomere of absorption tower, thereby realizes and being connected of raw material source of the gas by desulfurizing tower 2.The air inlet of methane dewater unit 11 is connected with the gas outlet on absorption tower epimere top, this methane dewater unit 11 also has gas outlet and tail gas outlet 14, and the gas outlet of methane dewater unit 11 is connected with the air inlet of methane pressure-swing absorption apparatus 12 through surge tank 9.Wherein, methane dewater unit 11 adopts two dehydrating tower structures, and it can and filter gas dewatering.Methane pressure-swing absorption apparatus 12 is the pressure-swing absorption apparatus of employing at least four towers, in the present embodiment, adopts the pressure-swing absorption apparatus of four towers.This methane pressure-swing absorption apparatus 12 has methane product gas gas outlet and tail gas gas outlet 16, and methane product gas 18, after surge tank 9, is exported in its gas product gas outlet.
Flash column 4 comprises flash column epimere and flash column hypomere, and flash column epimere top has air inlet, gas outlet and inlet, has liquid outlet and air inlet at the bottom of flash column epimere; Flash column hypomere top has inlet, air inlet and waste gas outlet, at the bottom of flash column hypomere, has liquid outlet.The bottom of regenerator 6 has liquid outlet, and the top of regenerator 6 has inlet and gas outlet, and the bottom of regenerator 6 has liquid outlet.Liquid outlet at the bottom of the hypomere of absorption tower is connected with the inlet of flash column hypomere through pump, liquid outlet at the bottom of flash column hypomere is connected with the inlet of flash column epimere, liquid outlet at the bottom of flash column epimere is connected with the inlet at regenerator 6 tops with the inlet on absorption tower hypomere top respectively, the liquid outlet at 6 ends of regenerator is connected with the inlet on the absorption section of costing top after cooler 7, and entering the liquid line of regenerator 6 and the liquid line of being drawn by regenerator 6 can be realized and be connected and control flow direction by reversal valve.The gas outlet that regenerator 6 pushes up is connected with the air inlet at the bottom of flash column epimere, the gas outlet on flash column epimere top is connected with the air inlet of carbon dioxide dehydration device 8 after cooling driers 5, and the condensation-water drain of cooling driers 5 is connected to flash column epimere top and flash column hypomere top through backflow blowback.Carbon dioxide dehydration device 8 adopts two dehydrating tower structures, it has gas outlet and tail gas outlet 13, the gas outlet of carbon dioxide dehydration device 8 is connected with the air inlet of carbon dioxide pressure-swing absorption apparatus 10 through surge tank 9, carbon dioxide pressure-swing absorption apparatus 10 is the pressure-swing absorption apparatus of employing at least two towers, carbon dioxide pressure-swing absorption apparatus 10 has gas product gas outlet and tail gas gas outlet 15, carbon dioxide product gas 17, after surge tank 9, is exported in its gas product gas outlet.
Shown in accompanying drawing 2, above-mentioned separating-purifying device adopts following technique to realize the separating-purifying to rubbish landfill gas: first, adopt methyl diethanolamine method (MDEA) that rubbish landfill gas is separated into the gas that is rich in methane and the solution that is absorbed with carbon dioxide; Then, separate through pressure-variable adsorption and obtain methane product gas being rich in after the gas dewatering of methane; Carry out flash distillation and make it discharge the gas that contains carbon dioxide being absorbed with the solution of carbon dioxide, will after the gas dewatering that contain carbon dioxide, separate through pressure-variable adsorption and obtain carbon dioxide product gas.
Concrete, extract unstripped gas, rubbish landfill gas is supplied with separating-purifying device by raw material source of the gas, and first unstripped gas is pressurized to 1.2Mpa to 2MPa through compressor 1, and the gas after compression passes into desulfurization in desulfurizing tower 2, and in the gas after desulfurization, sulfur content is down to 10mg/m 3, make it meet the standard of pipe natural gas.Gas after desulfurization is passed into by bottom in the material filling type absorption tower 3 that methyldiethanolamine solution is housed, in this absorption tower 3, carbon dioxide in rubbish landfill gas react with methyldiethanolamine solution and be absorbed form be absorbed with the liquid of carbon dioxide and discharged by the liquid outlet of 3 bottoms, absorption tower, other are mainly the gas of methane, and the gas that is rich in methane is discharged by the gas outlet at 3 tops, absorption tower.
Be rich in the gas pressure of methane at 1.2Mpa to 2MPa, it enters cooling driers by 3 tops, absorption tower and is refrigerated to 5 DEG C to 8 DEG C, remove most of moisture, then in methane dewater unit 11, carry out adsorption dry with activated alumina, further remove residual steam, water dew point under normal pressure is reduced to below 5 DEG C; The gas after deep dehydration is filtered, filtering particle and impurity wherein, finally passes in the methane pressure-swing absorption apparatus 12 that is at least 4 towers again.In each adsorption tower, carry out successively: 1, High Pressure Absorption, adsorptive pressure is 1.2 to 1.5MPa, adsorption time is 30 to 120s; 2, along putting, slowly open unstripped gas outlet valve, recycle the higher gas product of purity, economize in raw materials, improve yield; 3, co-current and pressure equalization, after first adsorption tower absorption finishes, adsorbent starts to enter the regeneration stage, along absorption direction, gas higher purity in tower is put into the adsorption tower (this process is not only step-down process, reclaims especially the process of bed dead space available gas) of the lower pressure of having regenerated; 4, inverse put, along absorption direction opposite direction adsorption column pressure is down to and is approached normal pressure; 5, resolve, at adsorption tower inlet end, vavuum pump is installed, vacuumize parsing, adsorbent is resolved more thorough.
Be absorbed with the liquid of carbon dioxide, rich solution goes out from absorption tower 3 underflows, is sent by pumping to flash column hypomere, higher than entering unstripped gas CO 2flash distillation under the condition of dividing potential drop, discharges out the gas such as hydrogen, nitrogen of dissolving and is discharged by the gas outlet of flash column hypomere at this, and liquid discharges out most of CO under normal pressure to flash column epimere 2and discharged by the gas outlet of flash column epimere.Solution after flash regeneration is semi lean solution, and its major part is returned absorption tower hypomere with pump, and fraction is pumped to regenerator 6 thermal regenerations.Lean solution after steam stripping regeneration is driven into absorption tower epimere after heat exchanger, water cooler are cooling, is entered the bottom of flash column epimere from regenerator 6 stripping gas out by the gas outlet at regenerator 6 tops, makes low pressure flash section solution temperature increase.From the out steam-laden CO of flash column epimere of low pressure 2gas, cooling through cooling driers 5, remove most of water, condensed water is delivered to flash column 4 with reflux pump, and gas after dewatering dewaters by the carbon dioxide activated alumina degree of depth in device 8 of dewatering again; Gas after the degree of depth dewaters passes into the carbon dioxide pressure-swing absorption apparatus 10 of another set of at least 2 towers again, and adsorptive pressure is 1.2 to 1.5MPa, and adsorption time is 30 to 120s.In each adsorption tower, boost respectively, adsorb, equal process continuous gas generations such as pressure, inverse put, parsing, and make CO 2purity reaches more than 99%.
First said apparatus and technique adopt methyl diethanolamine method separating carbon dioxide and methane, and MDEA solution enters from 3 tops, absorption tower, absorb CO 2after rich solution flash distillation under flash column hypomere intermediate pressure condition, the solution after flash distillation is decompressed to normal pressure in the flash distillation of flash column epimere after heating, after flash distillation, solvent is returned to the circulation of absorption tower hypomere with pump.This method is applicable to CO 2the raw material gas purifying that dividing potential drop is high, therefore, for rubbish landfill gas, its CO 2content accounts for 40% to 55%, adopts methyl diethanolamine can save cost of investment.And pressure-variable adsorption to show equipment aspect gas processed simple separating, operate, easy maintenance, energy saving economy, flexible adjustment, the advantage such as equipment is safe and reliable to operation, is a kind of gas producing technology of maturation.It mainly comprises the power supply equipment (as compressor) of a set of unstripped gas, and two towers are equipped with the adsorption tower of adsorbent above, a set of programme-control automatic switchover valve and a set of instrumentation.By program, adsorption time can be set, regulate automatic switchover time switch, realize and adsorb simultaneously and resolve, reach the object of continuous gas generation.Unstripped gas, after pretreatment, enters pressure-swing absorption apparatus, by boosting, adsorb, all press, along putting, the process such as inverse put and parsing, obtain highly purified gas product.
Above-described embodiment is only explanation technical conceive of the present utility model and feature, and its object is to allow person skilled in the art can understand content of the present utility model and implement according to this, can not limit protection domain of the present utility model with this.All equivalences of doing according to the utility model Spirit Essence change or modify, within all should being encompassed in protection domain of the present utility model.

Claims (7)

1. a rubbish landfill gas separating-purifying device, is characterized in that: it comprises the absorption tower, methane dewater unit, methane pressure-swing absorption apparatus, flash column, carbon dioxide dehydration device, the carbon dioxide pressure-swing absorption apparatus that are provided with methyldiethanolamine solution;
Described absorption tower comprises absorption tower epimere and absorption tower hypomere; The air inlet of described absorption tower hypomere is connected with raw material source of the gas, the air inlet of described methane dewater unit is connected with the gas outlet that described absorption tower epimere pushes up, and the gas outlet of described methane dewater unit is connected with the air inlet of described methane pressure-swing absorption apparatus; Described methane pressure-swing absorption apparatus has methane product gas gas outlet and tail gas gas outlet;
Described flash column comprises flash column epimere and flash column hypomere; Liquid outlet at the bottom of described absorption tower hypomere is connected with the inlet of described flash column hypomere, liquid outlet at the bottom of described flash column hypomere is connected with the inlet of described flash column epimere, and the liquid outlet at the bottom of described flash column epimere is connected with the inlet that described absorption tower hypomere pushes up; Described flash column hypomere top has waste gas outlet, the gas outlet that described flash column epimere pushes up is connected with the air inlet of described carbon dioxide dehydration device, the gas outlet of described carbon dioxide dehydration device is connected with the air inlet of described carbon dioxide pressure-swing absorption apparatus, and described carbon dioxide pressure-swing absorption apparatus has gas product gas outlet and tail gas gas outlet.
2. rubbish landfill gas separating-purifying device according to claim 1, it is characterized in that: it also comprises regenerator, liquid outlet at the bottom of described flash column epimere is also connected with the inlet of described regenerator, liquid outlet at the bottom of described regenerator is connected with the inlet on the described absorption section of costing top, and the gas outlet of described regeneration overhead is connected with the air inlet at the bottom of described flash column epimere.
3. rubbish landfill gas separating-purifying device according to claim 2, is characterized in that: the liquid outlet at the bottom of described regenerator is connected with the inlet that the described absorption section of costing is pushed up after cooler.
4. rubbish landfill gas separating-purifying device according to claim 1, it is characterized in that: the gas outlet on described flash column epimere top is connected with the air inlet of described carbon dioxide dehydration device after cooling driers, the condensation-water drain of described cooling driers returns and is connected to described flash column epimere top and described flash column hypomere pushes up.
5. rubbish landfill gas separating-purifying device according to claim 1, it is characterized in that: it also comprises desulfurizing tower, the air inlet of described desulfurizing tower is connected with raw material source of the gas, and the gas outlet of described desulfurizing tower is connected with the air inlet of described absorption tower hypomere.
6. rubbish landfill gas separating-purifying device according to claim 1, is characterized in that: between described carbon dioxide dehydration device and described carbon dioxide pressure-swing absorption apparatus, be respectively arranged with surge tank between described methane dewater unit and described methane pressure-swing absorption apparatus.
7. rubbish landfill gas separating-purifying device according to claim 1, is characterized in that: described methane pressure-swing absorption apparatus is the pressure-swing absorption apparatus of at least four towers; Described carbon dioxide pressure-swing absorption apparatus is the pressure-swing absorption apparatus of at least two towers.
CN201420485397.3U 2014-08-27 2014-08-27 Rubbish landfill gas separating-purifying device Active CN203990238U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105368518A (en) * 2015-11-26 2016-03-02 同济大学 System for garbage landfill gas purification and energy utilization and use method thereof
CN109777544A (en) * 2019-03-19 2019-05-21 山东京博石油化工有限公司 A kind of processing system of torch gas

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105368518A (en) * 2015-11-26 2016-03-02 同济大学 System for garbage landfill gas purification and energy utilization and use method thereof
CN109777544A (en) * 2019-03-19 2019-05-21 山东京博石油化工有限公司 A kind of processing system of torch gas

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