CN102059032B - Method and device for separating gas from liquid - Google Patents
Method and device for separating gas from liquid Download PDFInfo
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- CN102059032B CN102059032B CN2010105697998A CN201010569799A CN102059032B CN 102059032 B CN102059032 B CN 102059032B CN 2010105697998 A CN2010105697998 A CN 2010105697998A CN 201010569799 A CN201010569799 A CN 201010569799A CN 102059032 B CN102059032 B CN 102059032B
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Abstract
The invention relates to a device for separating gas from liquid for refuse filling gas and other biogas. The invention is characterized in that low-pressure filling gas output by a blower is used as a working medium for jetting and lifting condensate liquid, and after the working medium is subjected to gas-liquid separation in a gas stripping medium separator, gas returns to a gas inlet of a settling chamber and is used as the filling gas of the working medium for completely recycling; after the low-pressure filling gas working medium is input into the settling chamber, the working medium can meet the requirement for one-time lifting height of the condensate liquid; and if the condensate liquid needs to be lifted once again, the low-pressure filling gas output by the blower is introduced into the gas stripping medium separator to pressurize the condensate liquid to realize secondary lifting. The method can be used for completely recovering the filling gas used as the working medium, thereby stopping the working medium from being directly exhausted to the atmosphere from an ejector.
Description
Technical field
The present invention relates to a kind of gas-liquid separation device for rubbish landfill gas and other biogas, under condition of similarity, also can be used for the gas-liquid separation device of general industry gas, the lifting that reaches gas-liquid separation, the capture of mist grit and condensate liquid is derived.
Background technology
In the prior art, its technique of landfill gas (LFG) gathering system is as follows both at home and abroad: LFG gas is extracted out by air blast from the underground gas well of refuse landfill, enter main after having compiled each gas well gas body, after gas-liquid separation, enter air blast, send landfill gas purifier or other use device after the pressurization.The landfill gas main generally is embedded in underground, especially in the north, is embedded in below the frost line, generally about-1.0m.Because the LFG gas temperature of extracting out from underground landfill gas well is higher, and saturated by steam institute, after the derivation, because environment temperature lower (particularly in the winter time) is carried water droplet and grit secretly therefore produce in a certain amount of condensed water and the gas phase.If do not remove the moisture among the LFG, enter the normal operating that air blast then has a strong impact on air blast.
At present, the gas-liquid separator that generally adopts both at home and abroad is foreign technology, its Separate System of Water-jet is structure as shown in Figure 2, LFG enters first cylindrical gas-liquid separator 15, derive into water sealed tank 16 at the bottom of its condensate liquid self-separation device, enter collecting tank 17 by water sealed tank again, and lime set is promoted to ground and enters sewer or ooze the drop liquid pool with pump 18.And separator gas out just can enter air blast owing to carrying water droplet secretly therefore need ad hoc dehydrator 19 further to remove water droplet.As shown in Figure 2, because that gas-liquid separator has been arranged at is semi-underground, the gravity flow of still needing successively of its lime set enters water sealed tank 16 and collecting tank 17, therefore the two need to be placed darker coagulation heatable adobe sleeping platform, as seen its process equipment is arranged all complicated.
Owing to being full of LFG in the separator, and about 55% being methane in this type of gas, is inflammable and explosive Class A gas, therefore should divide " 0 " district into by requirement of explosion proof in the separator.Because the motor of immersion pump there is no the product of satisfied " 0 " district requirement of explosion proof at present, so in the past LFG gas-liquid separator design both at home and abroad, the condensate liquid withdrawing device neither is set, and that does not also establish divided gas flow catches the foam device, but adopts 5 equipment shown in Figure 2 to finish gas-liquid separation.So both increased equipment investment, and need establish again darker concrete melt pit, and increased construction investment, and the operation of lower hole is also very inconvenient.
In June, 2006, Global Environment Facility (GEF) subsidizes " Anshan Landfill gas is produced the motor vehicle fuel demonstration project " of the patented technology that adopts independent development and goes into operation smoothly, the gas-liquid separator of the blower system of its process for purifying pre-treatment is good through running effect more than 2 years, has guaranteed the normal operation of air blast.Described gas-liquid separator gas collection liquid separates, mist captures, lime set is extracted out in one, and the equipment direct-burried is in semi-underground, and drawing liquid adopts steam jet ejector to place ground, has that equipment is simple, a reduced investment, the characteristics such as easy to operate.
The above-mentioned patent No. is the multifunctional gas-liquid separator of ZL200920012063.3, has been successfully applied to landfill yard, but also has certain limitation.Because domestic most landfill yard especially in south, does not have steam to be available for condensate liquid steam and sprays lifter at present, promote with blast injection and then do not meet safety requirements.Therefore promoting, LFG gas-liquid separator condensate liquid become the problem that landfill yard needs further solution.
Summary of the invention
The purpose of this invention is to provide a kind of gas-liquid separation device, the method reclaims the working media that promotes lime set through the low pressure landfill gas of air blast output as injection, and the lifting of the gas-liquid after promoting medium returns expansion chamber raw material landfill gas gas access after gas-liquid separation, recycle the landfill gas as working media fully, stopped directly to efflux atmosphere from injector.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of gas-liquid separation device, employing promotes the working media of condensate liquid as injection from the low pressure landfill gas of air blast output, this working media in the air lift dielectric separator after gas-liquid separation gas return the expansion chamber gas access, can recycle fully as the landfill gas of working media; Gas-liquid separation device comprises expansion chamber, gas inlet tube, baffle plate, mist eliminator, gas outlet tube, air lift dielectric separator, be provided with the condensate liquid riser in the expansion chamber, condensate liquid riser bottom is provided with the injection lifter, and the condensate liquid riser is connected with the low pressure landfill gas air inlet pipe of exporting from air blast by spraying lifter; Condensate liquid riser top exit is connected with the air lift dielectric separator, and described air lift dielectric separator is provided with the low pressure landfill gas air inlet from air blast output.
Described air lift dielectric separator is provided with gas vent, and gas vent is connected with expansion chamber raw material landfill gas gas inlet tube.
Be provided with condensate drain in the described air lift dielectric separator, the condensate drain end opening communicates with condensate liquid, the condensate drain air lift dielectric separator top that is positioned at suitable for reading.
Compared with prior art, the invention has the beneficial effects as follows:
1) lifting of adopting LFG not only to solve condensate liquid as the air lift working media, and working media can be in the air lift dielectric separator after gas-liquid separation, and LFG discharges from the device top and returns into LFG gas-liquid separator suction inlet and all recovery.
2) condensate liquid once promotes in expansion chamber and can satisfy condensate liquid by design and efflux requirement, if need further to promote, can import low pressure LFG in the air lift dielectric separator and again pressurize, and secondary promotes and meets design requirement.
3) adopt landfill gas to spray as condensate liquid and promote working media, saved the steam consumption that in the past adopts steam to spray, and stopped landfill gas and efflux, have the effect of energy-conserving and environment-protective.
Description of drawings
Fig. 1 is the structural representation of gas-liquid separator of the present invention;
Fig. 2 is the structure chart of gas-liquid separator in the background technology.
The specific embodiment
See Fig. 1, gas-liquid separation device, comprise expansion chamber 1, baffle plate 2, mist eliminator 3, LFG gas outlet tube 4, LFG gas inlet pipe 7, air lift dielectric separator 8, be provided with condensate liquid riser 6 and baffle plate 2 in the expansion chamber 1, top is provided with interface of the level gauge 10, condensate liquid riser 6 bottoms are provided with sprays lifter 11, and condensate liquid riser 6 is connected with the low pressure landfill gas air inlet pipe 5 of exporting from air blast by spraying lifter 11; Condensate liquid riser 6 top exits are connected with air lift dielectric separator 8.Air lift dielectric separator 8 is provided with the low pressure landfill gas air inlet 13 from air blast output, be provided with condensate drain 9 in the air lift dielectric separator 8, condensate drain 9 end openings communicate with condensate liquid, Great Gulch or sewer are removed to cut by the pipeline transport of condensate in condensate drain 9 air lift dielectric separator 8 tops that are positioned at suitable for reading.Air lift dielectric separator 8 is provided with gas vent 14, and gas vent 14 is connected with the raw material landfill gas gas inlet tube 7 of expansion chamber 1.
Adopt the separation method of described gas-liquid separator to be, by the injection lifter 11 that expansion chamber 1 bottom arranges condensate liquid is extracted out, adopt the low pressure landfill gas of air blast 12 outputs as spraying the working media that promotes condensate liquid condensate liquid to be promoted, gas-liquid after the lifting promotes medium gas after gas-liquid separation and returns expansion chamber unstrpped gas inlet tube 7, landfill gas as working media can be recycled fully, has stopped directly to efflux atmosphere from injector.Liquid level by expansion chamber base injcction lifter structure, condensate liquid and the amount that passes into base injcction device working media (LFG) can be guaranteed hoisting depth of condensate liquid, if this hoisting depth can not meet the demands, consider to import from air lift dielectric separator 8 again the low pressure landfill gas pressurization of air blast output, the condensate liquid second lift is entered to final desired height cut Great Gulch or garbage filter liquid pool or sewerage.
The course of work of the present invention is: gas-liquid enters expansion chamber 1, at first be subjected to the bump of baffle plate 2, enter expansion chamber 1 rear flow velocity by in the pipe time 4m/s and be down to about 0.25m/s, make the sedimentation such as free water and water droplet or suction-operated run underneath to expansion chamber 1 bottom along baffle plate 2 and wall and accumulate.Air-flow flows downward to baffle plate bottom baffling along baffle plate 2 and upwards flows, through expansion chamber 1; Because deceleration, sedimentation and be subjected to baffle plate bump absorption, gas-liquid is separated in stopping approximately 13～15s, but＜10 μ m water, mist and floating dust be difficult to sedimentation.Given this, at expansion chamber 1 gas outlet mist eliminator 3 with woven wire is set, can more thoroughly removes water droplet, mist and floating dust, make and remove efficient and reach 98～99%.Lodge in the condensate liquid of expansion chamber 1, derive through 6 liftings of condensate liquid riser again by injection lifter 11 suctions that are arranged at expansion chamber 1 bottom, enter air lift dielectric separator 8 and carry out the gas-liquid two-phase initial gross separation.
In air lift dielectric separator 8, the air lift medium stopped about 5 seconds, and gas-liquid two-phase can obtain effective separation, and 7 medium and comprehensive recovery of LFG gas inlet pipe of expansion chamber 1 can be discharged and be imported by air lift dielectric separator 8 top gas outlet 14 to LFG gas; Condensate liquid can further pressurize by the LFG gas that is imported by top air inlet 13 in air lift dielectric separator 8 bottoms (in advance closing first medium inlet and LFG recurrent canal valve), further promote about 3500mm, can discharge in garbage filter liquid pool higher, far away or section Great Gulch.Because condensate liquid is its CODcr value＜80mg/l by analysis, pH value 6～7 meets national grade one discharge standard, can directly enter corresponding drainage system.
Cylindrical structure is adopted in described sedimentation separation chamber, and the built-in radial baffle plate is when treatment scale is 10000m
3During/d, sedimentation separation chamber cylinder diameter is 1000mm, and gas is at expansion chamber flow velocity 0.25～0.3m/s, the time of staying 10～15s.
Described gas outlet arranges the mist eliminator with woven wire.Be 10000m processing the landfill gas scale
3During/d, the mist eliminator diameter is 180mm highly at 250～300mm, and maximum gas flow rate is 3.4m/s approximately, and operating gas velocity is 2.75m/s approximately.
Described mist eliminator adopts overall diameter type, upper mounted disc woven wire mist eliminator.Its woven wire adopts standard type or heavy duty detergent, and respective metal silk specification adopts respectively φ 0.23 or φ 0.19; Can adopt circle or flat stainless steel wire to be pressed into waveform and roll into the net piece, its eyelet number can be by in the 100mm 40 or 60.Its material should adopt 1Cr18Ni9Ti.
The condensate liquid of expansion chamber bottom adopts the injection lifter to promote from the expansion chamber bottom and extracts out.Spray working media and adopt the low pressure landfill gas of exporting from air blast.Spraying the lifter specification can be undertaken by spraying the lifter design according to the requirement such as hoisting depth of discharging lime set speed, working media flow, lime set.According to the requirement of lime set hoisting depth, the lime set liquid level should keep about 800mm at the bottom of the device.Promote every day to efflux once and calculate.Spraying lifter employing landfill gas is working media, once promoting height is about 1300mm, then design injection riser is φ 57 * 3.5, working media (LFG) pipe is φ 32 * 2, import department is reduced to φ 25 * 2.5 at the injection lifter, import for ease of lime set, the riser end is by 60 ° of enlargings.Because LFG forms high velocity stream and sprays into riser at the nozzle place, form suction and condensate liquid is sucked riser at jet expansion.In the riser because gas, liquid two-phase mix, and wherein gas liquid ratio can reach 3～4, even higher, and the condensate liquid fluid column is pressed law of connected vessels like this, condensate liquid severe two-phase mixture severe and lifting liquid is discharged in the riser.In addition, because jet-action also is conducive to gas-liquid mixture lifting discharge.
The air lift medium is after initial gross separation, and the working media landfill gas is all returned into described separator inlet and reclaimed.Consider that condensate liquid may enter and cut Great Gulch or a diafiltration liquid pool, therefore design adopts the landfill gas of air blast output to import separator to the condensate liquid second lift that pressurizes, it is discharged height and is determined by low pressure landfill gas pressure.Produce natural gas when LFG is used for purifying, then P 〉=38kPa is pressed in its output, and at this moment, its second lift height is 3500mm approximately.
The present invention can be applicable to that the lifting of liquid effluxes etc. at the bottom of gas-liquid separation, dedusting foam removal and the device of landfill gas and other gas.
Claims (3)
1. gas-liquid separation device, it is characterized in that, employing promotes the working media of condensate liquid as injection from the low pressure landfill gas of air blast output, this working media in the air lift dielectric separator after gas-liquid separation gas return the expansion chamber gas access, can recycle fully as the landfill gas of working media; Gas-liquid separation device comprises expansion chamber, gas inlet tube, baffle plate, mist eliminator, gas outlet tube, air lift dielectric separator, be provided with the condensate liquid riser in the expansion chamber, condensate liquid riser bottom is provided with the injection lifter, and the condensate liquid riser is connected with the low pressure landfill gas air inlet pipe of exporting from air blast by spraying lifter; Condensate liquid riser top exit is connected with the air lift dielectric separator, and described air lift dielectric separator is provided with the low pressure landfill gas air inlet from air blast output.
2. a kind of gas-liquid separation device according to claim 1 is characterized in that, described air lift dielectric separator is provided with gas vent, and gas vent is connected with expansion chamber raw material landfill gas gas inlet tube.
3. a kind of gas-liquid separation device according to claim 1 is characterized in that, is provided with condensate drain in the described air lift dielectric separator, and the condensate drain end opening communicates with condensate liquid, the condensate drain air lift dielectric separator top that is positioned at suitable for reading.
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| CN2010105697998A CN102059032B (en) | 2010-12-02 | 2010-12-02 | Method and device for separating gas from liquid |
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| CN2010105697998A CN102059032B (en) | 2010-12-02 | 2010-12-02 | Method and device for separating gas from liquid |
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| CN102059032B true CN102059032B (en) | 2013-01-23 |
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Citations (6)
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|---|---|---|---|---|
| GB2422159A (en) * | 2005-01-13 | 2006-07-19 | Helix Rds Ltd | Venturi removal of water in a gas wall |
| CN201001995Y (en) * | 2007-02-09 | 2008-01-09 | 山东十方新能源有限公司 | Landfill gas dewatering dust-cleaning device |
| CN101294499A (en) * | 2007-04-25 | 2008-10-29 | 张庆玉 | Double-function vacuum apparatus for extracting mash gas and lifting groundwater for coal mine safety |
| US20090221865A1 (en) * | 2008-02-28 | 2009-09-03 | Renaud Regis P | Method and apparatus for injecting enriched steam |
| CN201380025Y (en) * | 2009-03-19 | 2010-01-13 | 中冶焦耐工程技术有限公司 | Multi-function gas-liquid separator |
| CN201889141U (en) * | 2010-12-02 | 2011-07-06 | 中冶焦耐(大连)工程技术有限公司 | Gas-liquid separator |
-
2010
- 2010-12-02 CN CN2010105697998A patent/CN102059032B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2422159A (en) * | 2005-01-13 | 2006-07-19 | Helix Rds Ltd | Venturi removal of water in a gas wall |
| CN201001995Y (en) * | 2007-02-09 | 2008-01-09 | 山东十方新能源有限公司 | Landfill gas dewatering dust-cleaning device |
| CN101294499A (en) * | 2007-04-25 | 2008-10-29 | 张庆玉 | Double-function vacuum apparatus for extracting mash gas and lifting groundwater for coal mine safety |
| US20090221865A1 (en) * | 2008-02-28 | 2009-09-03 | Renaud Regis P | Method and apparatus for injecting enriched steam |
| CN201380025Y (en) * | 2009-03-19 | 2010-01-13 | 中冶焦耐工程技术有限公司 | Multi-function gas-liquid separator |
| CN201889141U (en) * | 2010-12-02 | 2011-07-06 | 中冶焦耐(大连)工程技术有限公司 | Gas-liquid separator |
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