CN201850251U - Oilfield associated gas membrane-process light hydrocarbon recovery system - Google Patents
Oilfield associated gas membrane-process light hydrocarbon recovery system Download PDFInfo
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- CN201850251U CN201850251U CN201020550532XU CN201020550532U CN201850251U CN 201850251 U CN201850251 U CN 201850251U CN 201020550532X U CN201020550532X U CN 201020550532XU CN 201020550532 U CN201020550532 U CN 201020550532U CN 201850251 U CN201850251 U CN 201850251U
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Abstract
The utility model relates to the treatment field of oilfield associated gas, in particular to an oilfield associated gas membrane-process light hydrocarbon recovery system which is characterized in that a gas-phase outlet of a low-temperature separator is communicated with the gas inlet of a membrane separation unit, the liquid-phase outlet of the low-temperature separator is communicated with the liquid inlet of a deethanizing column, a gas-phase outlet at the top of the deethanizing column is communicated with the gas inlet of the membrane separation unit, the liquid-phase outlet of the deethanizing column is communicated with the inlet of a liquefied gas column, and the membrane separation unit is provided with two gas outlets, i.e. a lean gas outlet and a rich gas outlet, wherein the lean gas outlet is communicated with a dry gas export pipe through a pipeline after lean gas is heat-exchanged through a multi-stream cold box and the rich gas outlet is communicated with a feed gas buffer tank through a pipeline. On the premise that few investment and few operating expense are increased, the further recovery of light hydrocarbon in dry gas can be realized, the problem that the content of the light hydrocarbon in the dry gas in the prior art is high can be solved, the process economy is improved, the dry gas quality is improved, the problem of black smoke during combustion can be solved, the environmental pollution is reduced, the problem of coking at a burner nozzle and the problem of pipeline blockage during dry gas delivery can also be solved, and the service life of the burner nozzle can be prolonged.
Description
Technical field
The utility model relates to the process field of associated gas, particularly by behind the shallow refrigeration technique recovery lighter hydrocarbons, and the further recovery system of the lighter hydrocarbons that still contain in its dry gas.
Background technology
The normal both at home and abroad at present associated gas methods of light hydrocarbon recovery that adopts can be divided into four kinds, that is: cold oil absorption process, outer circulation refrigeration partition method, swell refrigeration method, hybrid refrigeration partition method.Along with the continually developing and utilizing of new technology, the cold oil absorption process is eliminated, and the production method of swell refrigeration is rising year by year.The production method of hybrid refrigeration is also adopted by a lot of users, and the low pressure rich gases of high throughput especially are used to reclaim ethane and above component is more superior.The outer circulation refrigeration system, refrigerant adopts ammonia, propane etc. more, can outer circulation be set according to gas source condition and separation requirement, product yield can be given in advance, for the low pressure rich gas or do not wish to have the unstripped gas of the obvious pressure-losses to handle higher superiority is arranged, and system is simple, processing ease, and the adaptability that feed gas composition is changed is stronger.The swell refrigeration system, the size of cold depends on the pressure and the composition of unstripped gas itself, when than the heavy hydrocarbons too high levels, obtaining the higher yield of C3, C4+ is the comparison difficulty, and refrigeration and separation system unification, require in this system each major equipment efficient coupling, the making full use of of cold, optimum operation condition determine etc. that technical difficulty is bigger.Adopt the refrigeration system of this mode stronger, be used for lean gas more the poor adaptability of component change.Mixed refrigeration systems, this system are the combinations of above-mentioned two kinds of methods, and promptly cold is from two portions, have drawn the advantage of above-mentioned two kinds of methods aspect rationally the utilizing of energy, and therefore the adaptability of running is stronger.
A common feature of above-mentioned 4 kinds of associated gas lighter hydrocarbons recovery is, all is by cooling, produces phase transformation, carries out gas-liquid separation again, thereby realizes the recovery of lighter hydrocarbons.Two kinds of freezing degree of depth of general branch, a kind of is to be as cold as-30 ℃ ~-20 ℃ shallow cold technology, a kind of is the cryogenic technology that is as cold as below-80 ℃, for shallow cold technology, because freezing temp is higher, so lighter hydrocarbons content is higher in the dry gas, reclaims not exclusively; For cryogenic technology, although can realize the freezing of lesser temps, lighter hydrocarbons recovery is comparatively abundant,, plant investment is very expensive, and energy consumption is very high, lighter hydrocarbons recovery cost height.
Accompanying drawing 1 is seen by the system that advanced at present associated gas reclaims lighter hydrocarbons: the incoming stock gas surge tank of unstripped gas, enter the one-level compressor behind the separatory, boost, after water cooling plant is cooled to 40 ℃, extract Sweet natural gas out into one-level discharge knockout drum, enter two stage compressor behind the separatory and boost, be cooled to 40 ℃ through air cooling device; Separate cooled Sweet natural gas and enter the separation of compressor secondary discharge knockout drum, isolated liquid phase decontaminated water treatment system enters the multiple flow ice chest behind the injection ethylene glycol antifreeze after gas phase and the liquid-phase mixing.After changing the gas-liquid mixture cooling after cold, enter ammonia evaporator, enter low-temperature separator again and reclaim wherein ethylene glycol, reuse.Isolated gas phase enters ice chest through decompression, cooling, and is defeated outward as dry gas after the heat exchange.Isolated liquid phase enters deethanizing column after ice chest heats up.Deethanizer overhead is established internal reflux ammonia vaporizer-condenser, establishes reboiler at the bottom of the tower, and deethanizing cat head gas enters ice chest through step-down, cooling, utilizes behind its cold outer defeated.Liquid phase enters the liquefied gas tower at the bottom of the deethanizing column, the liquefied gas column overhead is established the internal reflux condenser, establish reboiler at the bottom of the tower, liquefied gas column overhead gas enters liquid gas storage tank after the air cooling device cooling, emit a small amount of non-condensable gas, enter LPG cyoinders after metering, the stable light oil of output enters the light oil storage tank at the bottom of the tower after the air cooling device cooling.
Yet the dry gas in the present this technology still contains 6% ~ 10% lighter hydrocarbons can't be obtained reclaiming, because lighter hydrocarbons content is higher in the dry gas, the component that this part value content is very high can not be efficiently recovered, can cause the huge wasting of resources, and lighter hydrocarbons are in some combustion processes, can produce a large amount of black smokes, contaminate environment is also stopped up burner noz(zle) easily; Simultaneously, the dry gas dew point is higher, long apart from course of conveying in, the resistance of ducting is bigger, increases conveying energy consumption, when when envrionment temperature is low, has liquid and ice produces, and stops up management, influence is carried.Therefore, how both economical in the shallow cold recovery technology of solution, the problem that dry gas lighter hydrocarbons content is high has important practical significance.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned not enough problem, and a kind of associated gas embrane method light hydrocarbon recovery system is provided, and shallow cold oil field associated gas lighter hydrocarbons recovery technology and membrane separation technique organically combine, and system layout is reasonable, and cost is low, the efficient height.
The technical scheme that the utility model is adopted for achieving the above object is: associated gas embrane method light hydrocarbon recovery system, comprise unstripped gas surge tank, compressor, refrigerating unit, low-temperature separator, deethanizing column and liquefied gas tower, the gaseous phase outlet of low-temperature separator is connected the inlet mouth of film separation unit, the liquid phase outlet is communicated with the deethanizing column fluid inlet, the gaseous phase outlet of deethanizer overhead is connected the inlet mouth of film separation unit, and the liquid phase outlet is communicated with the import of liquefied gas tower; Two strands of pneumatic outlets of film separation unit wherein, one stingy export pipeline are communicated with outside the dry gas defeated after the heat exchange of multiple flow ice chest; The outlet of another strand rich gas is communicated with the unstripped gas surge tank by the road.
Described associated gas embrane method recovery system, unstripped gas surge tank inlet mouth is communicated with the associated gas inlet, the outlet of unstripped gas surge tank bottom liquid is communicated with the liquefied gas tower by the road, the outlet of unstripped gas surge tank top gas divides the flow container inlet through the pipeline connection one-level that a stage compressor and water cooler are installed, the one-level separatory tank top pipeline connection secondary of pneumatic outlet through two stage compressor and air cooler are installed divides flow container, secondary separating tank bottom sewage outlet is communicated with Sewage treatment systems, top gaseous phase outlet and liquid phase outlet and feed liquor pipeline connection multiple flow ice chest fluid inlet, have the frostproofer inlet on the feed liquor pipeline, the frostproofer inlet is communicated with the ethylene glycol antifreeze feeder system, the outlet of multiple flow ice chest dry gas is communicated with the low-temperature separator inlet mouth, the ethylene glycol outlet of low-temperature separator bottom connects the ethylene glycol regeneration system rapidly, the low-temperature separator air outlet is communicated with the film separation unit inlet mouth, the stingy outlet of film separation unit discharges communication system outside the dry gas behind the multiple flow ice chest, the rich gas outlet of low-temperature separator is by the associated gas inlet of pipeline connection unstripped gas surge tank, the liquid phase outlet of low-temperature separator is communicated with the deethanizing column fluid inlet behind the multiple flow ice chest, deethanizing Tata item air outlet is through being equipped with the pipeline connection film separation unit of condenser, the stingy outlet of film separation unit tower discharges communication system outside the dry gas behind the multiple flow ice chest, the rich gas outlet of low-temperature separator is by the associated gas inlet of pipeline connection unstripped gas surge tank, reboiler is established in the deethanizing column bottom, heavy fluorine device export pipeline is communicated with liquefied gas tower fluid inlet, the liquefied gas column overhead is established the internal reflux condenser, establish reboiler at the bottom of the tower, the outlet of liquefied gas column overhead gas is through being equipped with the pipeline connection liquid gas storage tank of air cooling device, and stablizing the light oil outlet at the bottom of the tower has pipeline connection light oil storage tank through air cooling device is housed.
Described film separation unit comprises pretreatment unit and membrane separation apparatus.
The utility model associated gas embrane method light hydrocarbon recovery system, unstripped gas surge tank inlet mouth is communicated with the associated gas inlet, the outlet of unstripped gas surge tank bottom liquid is communicated with the liquefied gas tower by the road, the outlet of unstripped gas surge tank top gas divides the flow container inlet through the pipeline connection one-level that a stage compressor and water cooler are installed, the one-level separatory tank top pipeline connection secondary of pneumatic outlet through two stage compressor and air cooler are installed divides flow container, secondary separating tank bottom sewage outlet is communicated with Sewage treatment systems, top gaseous phase outlet and liquid phase outlet and feed liquor pipeline connection multiple flow ice chest fluid inlet, have the frostproofer inlet on the feed liquor pipeline, the frostproofer inlet is communicated with the ethylene glycol antifreeze feeder system, the outlet of multiple flow ice chest dry gas is communicated with the low-temperature separator inlet mouth, the ethylene glycol outlet of low-temperature separator bottom connects the ethylene glycol regeneration system rapidly, the low-temperature separator air outlet is communicated with the film separation unit inlet mouth, the stingy outlet of film separation unit discharges communication system outside the dry gas behind the multiple flow ice chest, the rich gas outlet of low-temperature separator is by the associated gas inlet of pipeline connection unstripped gas surge tank, the liquid phase outlet of low-temperature separator is communicated with the deethanizing column fluid inlet behind the multiple flow ice chest, deethanizing Tata item air outlet is through being equipped with the pipeline connection film separation unit of condenser, the stingy outlet of film separation unit tower discharges communication system outside the dry gas behind the multiple flow ice chest, the rich gas outlet of low-temperature separator is by the associated gas inlet of pipeline connection unstripped gas surge tank, reboiler is established in the deethanizing column bottom, heavy fluorine device export pipeline is communicated with liquefied gas tower fluid inlet, the liquefied gas column overhead is established the internal reflux condenser, establish reboiler at the bottom of the tower, the outlet of liquefied gas column overhead gas is through being equipped with the pipeline connection liquid gas storage tank of air cooling device, and stablizing the light oil outlet at the bottom of the tower has pipeline connection light oil storage tank through air cooling device is housed.
The utility model combines shallow cold oil field associated gas lighter hydrocarbons recovery technology and membrane separation technique, organic steam embrane method recovery technology is the new membrane isolation technique that the nineties is risen, and has been widely used in the recovery of liquefied gas (LPG), natural gas condensate (LPG) in the recovery of ethene in the petrochemical industry, propylene, vinylchlorid and other alkane alkene and the big gas holder etc.Its principle is: there is the dissolving diffusion process in the gas with various molecule in film, and solubleness, velocity of diffusion there are differences, thereby causes the gas with various molecule can there are differences by the speed of film, and this difference can realize the separation and the purification of gas.The characteristics of organic steam film are, can the higher molecules of penetrated preferably dew point, and in the associated gas sepn process, the heavy hydrocarbon penetrated preferably that dew point is higher, penetration speeds such as the C1 that dew point is lower, C2 are lower.According to these characteristics, theoretically, the organic steam film can be cut in the present associated gas process for recovering light hydrocarbon, improve the rate of recovery of lighter hydrocarbons, heavy hydrocarbon.
The utility model is under the situation that increases seldom investment and working cost, can realize the further recovery of lighter hydrocarbons in the dry gas, thereby solve the high problem of dry gas lighter hydrocarbons content in the former technology, improve the economy of technology, and the quality of dry gas, avoid over-emitting black exhaust problem in the combustion processes, reduce pollution to environment, also solve simultaneously blocking pipeline problem in nozzle knot charcoal problem and the dry gas course of conveying, prolonged the work-ing life of burner noz(zle).
Detect through experiment: use shallow cold+membrane separation technique reclaims associated gas technology and reclaims associated gas technology than simple shallow refrigeration technique, every 1000NM3/day associated gas, can reclaim 1 ton/day left and right sides lighter hydrocarbons more, power consumption increases about 500 degree/day, about 4500 yuan/day of direct economic benefit, about plant investment 500,000, the payback period was less than 4 months more than 3 years work-ing life for film.Can reduce dew point that associated gas handles the back dry gas more than 15 ℃ by this technology, reduce the generation of the resistance of ducting in the gas delivery process and hydrops, the phenomenon of freezing.
Description of drawings:
Fig. 1 is the utility model system architecture synoptic diagram.
Embodiment:
Below in conjunction with specific embodiment the utility model is described in further detail.
Associated gas embrane method light hydrocarbon recovery system as shown in Figure 1, unstripped gas surge tank 1 inlet mouth is communicated with associated gas inlet 17, the outlet of unstripped gas surge tank bottom liquid is communicated with liquefied gas tower 13 by the road, the outlet of unstripped gas surge tank top gas divides flow container 3 inlets through the pipeline connection one-level that a stage compressor 2 and water cooler 21 are installed, the one-level separatory tank top pipeline connection secondary of pneumatic outlet through two stage compressor 4 and air cooler 22 are installed divides flow container 5, secondary separating tank 5 bottom sewage outlets are communicated with Sewage treatment systems, top gaseous phase outlet and liquid phase outlet and feed liquor pipeline connection multiple flow ice chest 6 fluid inlets, have the frostproofer inlet on the feed liquor pipeline, frostproofer inlet 23 is communicated with the ethylene glycol antifreeze feeder system, multiple flow ice chest 6 dry gas export pipelines are communicated with low-temperature separator 8 inlet mouths behind ammonia evaporator 7, low-temperature separator bottom ethylene glycol outlet 18 connects the ethylene glycol regeneration system rapidly, the low-temperature separator air outlet is communicated with film separation unit 9 inlet mouths, the stingy outlet of film separation unit discharges communication system 19 outside the dry gas behind the multiple flow ice chest, the rich gas outlet of low-temperature separator is by the associated gas inlet 17 of pipeline connection unstripped gas surge tank, the liquid phase outlet of low-temperature separator is communicated with deethanizing column 10 fluid inlets behind the multiple flow ice chest, deethanizing Tata item air outlet is through being equipped with the pipeline connection film separation unit 12 of condenser, the stingy outlet of film separation unit tower discharges communication system 19 outside the dry gas behind the multiple flow ice chest, the rich gas outlet of low-temperature separator is by the associated gas inlet 17 of pipeline connection unstripped gas surge tank, reboiler 11 is established in the deethanizing column bottom, heavy fluorine device export pipeline is communicated with liquefied gas tower 13 fluid inlets, the liquefied gas column overhead is established the internal reflux condenser, establish reboiler 15 at the bottom of the tower, the outlet of liquefied gas column overhead gas is through being equipped with the pipeline connection liquid gas storage tank 16 of air cooling device 14, and stablizing the light oil outlet at the bottom of the tower has pipeline connection light oil storage tank 20 through air cooling device is housed.
Adopt above-mentioned associated gas embrane method light hydrocarbon recovery system to carry out oil field association device lighter hydrocarbons recovery, concrete technology is as follows:
The shallow cold reduction of the first step: the associated gas of pressure-fired enters the unstripped gas surge tank after measuring, enter the one-level compressor behind the separatory, boost to about 0.6MPa, temperature reaches about 120 ℃, after about cooling water condensation to 40 ℃, entering one-level divides and enters two stage compressor behind the flow container separatory and boost to about 2.2MPa, temperature reaches about 120 ℃, be cooled to about 40 ℃ through air cooling, enter secondary and divide flow container, sewage decontaminated water treatment system is injected ethylene glycol antifreeze after gas phase and the liquid-phase mixing;
The second step low ternperature separation process: the mixture that injects ethylene glycol antifreeze after gas phase and the liquid-phase mixing enters the multiple flow ice chest, and temperature drops to about 10 ℃, enters ammonia evaporator then and is cooled to about-25 ℃.Enter low-temperature separator recovery ethylene glycol wherein again, reuse.Isolated gas phase enters the organic steam film separating system, and the rich gas after the separation, pressure are pressure-fired, mixes with associated gas, reclaims lighter hydrocarbons wherein; Lean gas after the separation is decompressed to about 0.72MPa, is cooled to about-34 ℃ and enters ice chest, and is defeated outward as dry gas after the heat exchange;
The 3rd step deethanizing column is handled: the isolated liquid phase of low-temperature separator enters deethanizing column after ice chest is warming up to about 20 ℃, deethanizing cat head working pressure is controlled at about 1.7MPa, cat head is established internal reflux ammonia vaporizer-condenser, tower top temperature is controlled at about-15 ℃, establish reboiler at the bottom of the tower, column bottom temperature is controlled at about 67 ℃.Deethanizing cat head gas is gone into the organic steam film separating system, and the rich gas after the separation, pressure are pressure-fired, mixes with associated gas, reclaims lighter hydrocarbons wherein; Lean gas after the separation is decompressed to about 0.72MPa, is cooled to about-28 ℃ and enters ice chest, utilizes behind its cold outer defeated;
The 4th step liquefied gas tower is handled: liquid phase enters the liquefied gas tower at the bottom of the deethanizing column, liquefied gas column overhead working pressure is controlled at about 1.4MPa, and cat head is established the internal reflux condenser, and tower top temperature is controlled at about 80 ℃, establish reboiler at the bottom of the tower, temperature is controlled at about 145 ℃.Liquefied gas column overhead gas enters liquid gas storage tank after air cooling is cooled to 40 ℃, emit a small amount of non-condensable gas, enters LPG cyoinders after metering, and the stable light oil of output enters the light oil storage tank at the bottom of the tower after air cooling is cooled to 40 ℃.
Claims (3)
1. associated gas embrane method light hydrocarbon recovery system, comprise unstripped gas surge tank, compressor, refrigerating unit, low-temperature separator, deethanizing column and liquefied gas tower, it is characterized in that: the gaseous phase outlet of low-temperature separator is connected the inlet mouth of film separation unit, the liquid phase outlet is communicated with the deethanizing column fluid inlet, the gaseous phase outlet of deethanizer overhead is connected the inlet mouth of film separation unit, and the liquid phase outlet is communicated with the import of liquefied gas tower; Two strands of pneumatic outlets of film separation unit wherein, one stingy export pipeline are communicated with outside the dry gas defeated after the heat exchange of multiple flow ice chest; The outlet of another strand rich gas is communicated with the unstripped gas surge tank by the road.
2. associated gas embrane method light hydrocarbon recovery system according to claim 1, it is characterized in that: unstripped gas surge tank inlet mouth is communicated with the associated gas inlet, the outlet of unstripped gas surge tank bottom liquid is communicated with the liquefied gas tower by the road, the outlet of unstripped gas surge tank top gas divides the flow container inlet through the pipeline connection one-level that a stage compressor and water cooler are installed, the one-level separatory tank top pipeline connection secondary of pneumatic outlet through two stage compressor and air cooler are installed divides flow container, secondary separating tank bottom sewage outlet is communicated with Sewage treatment systems, top gaseous phase outlet and liquid phase outlet and feed liquor pipeline connection multiple flow ice chest fluid inlet, have the frostproofer inlet on the feed liquor pipeline, the frostproofer inlet is communicated with the ethylene glycol antifreeze feeder system, the outlet of multiple flow ice chest dry gas is communicated with the low-temperature separator inlet mouth, the ethylene glycol outlet of low-temperature separator bottom connects the ethylene glycol regeneration system rapidly, the low-temperature separator air outlet is communicated with the film separation unit inlet mouth, the stingy outlet of film separation unit discharges communication system outside the dry gas behind the multiple flow ice chest, the rich gas outlet of low-temperature separator is by the associated gas inlet of pipeline connection unstripped gas surge tank, the liquid phase outlet of low-temperature separator is communicated with the deethanizing column fluid inlet behind the multiple flow ice chest, deethanizing Tata item air outlet is through being equipped with the pipeline connection film separation unit of condenser, the stingy outlet of film separation unit tower discharges communication system outside the dry gas behind the multiple flow ice chest, the rich gas outlet of low-temperature separator is by the associated gas inlet of pipeline connection unstripped gas surge tank, reboiler is established in the deethanizing column bottom, heavy fluorine device export pipeline is communicated with liquefied gas tower fluid inlet, the liquefied gas column overhead is established the internal reflux condenser, establish reboiler at the bottom of the tower, the outlet of liquefied gas column overhead gas is through being equipped with the pipeline connection liquid gas storage tank of air cooling device, and stablizing the light oil outlet at the bottom of the tower has pipeline connection light oil storage tank through air cooling device is housed.
3. associated gas embrane method light hydrocarbon recovery system according to claim 1 and 2, it is characterized in that: film separation unit comprises pretreatment unit and membrane separation apparatus.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201020550532XU CN201850251U (en) | 2010-09-30 | 2010-09-30 | Oilfield associated gas membrane-process light hydrocarbon recovery system |
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| CN201020550532XU CN201850251U (en) | 2010-09-30 | 2010-09-30 | Oilfield associated gas membrane-process light hydrocarbon recovery system |
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| CN201850251U true CN201850251U (en) | 2011-06-01 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101985567A (en) * | 2010-09-30 | 2011-03-16 | 大连海奥膜技术有限公司 | Method and system for recovering light hydrocarbon by oil field associated gas membrane method |
| CN105909216A (en) * | 2016-06-21 | 2016-08-31 | 辽宁鹤恒科技有限公司 | Oil field associated gas conveying device and process |
| CN108587711A (en) * | 2018-04-24 | 2018-09-28 | 辽宁石油化工大学 | A kind of method and device of the associated gas removal of impurities of level Four one pattern |
-
2010
- 2010-09-30 CN CN201020550532XU patent/CN201850251U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101985567A (en) * | 2010-09-30 | 2011-03-16 | 大连海奥膜技术有限公司 | Method and system for recovering light hydrocarbon by oil field associated gas membrane method |
| CN105909216A (en) * | 2016-06-21 | 2016-08-31 | 辽宁鹤恒科技有限公司 | Oil field associated gas conveying device and process |
| CN108587711A (en) * | 2018-04-24 | 2018-09-28 | 辽宁石油化工大学 | A kind of method and device of the associated gas removal of impurities of level Four one pattern |
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