CN206646081U - A kind of multistage cascade membrane separation device of marsh gas purifying - Google Patents
A kind of multistage cascade membrane separation device of marsh gas purifying Download PDFInfo
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- CN206646081U CN206646081U CN201621092235.9U CN201621092235U CN206646081U CN 206646081 U CN206646081 U CN 206646081U CN 201621092235 U CN201621092235 U CN 201621092235U CN 206646081 U CN206646081 U CN 206646081U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The utility model provides a kind of multistage cascade membrane separation device of marsh gas purifying, biogas storage tank, booster fan, U-shaped drier, desulphurization system, distributor and film separation system including passing sequentially through pipeline communication, described film separation system is provided with two outlets, vent outlet and impermeable gas outlet are respectively oozed, oozes vent outlet and CO2Retracting device is connected, and impermeable gas outlet is connected with product gas storage tank, and product gas storage tank is connected with ring pumping unit.After first the biogas for enrichment of being fermented in biogas storage tank is pressurizeed by booster fan, after removing oil drying into U-shaped drier dehumidification, then by desulphurization system removing H2S, then entered biogas distribution in film separation system pipeline by distributor, vacuumized by ring pumping unit, mass transfer enhancement separative efficiency and raising CH4Permeability, reach the purpose for efficiently separating purifying marsh gas, while hollow-fibre membrane passes through multiple anti-plastics processing, prolonging service lifetime of film, reduces energy consumption, reduces investment outlay.
Description
Technical field
The utility model belongs to marsh gas purifying purification technique field, and in particular to a kind of multistage cascade UF membrane of marsh gas purifying
Device.
Background technology
Biogas refers to a kind of mixed gas caused by organic matter anaerobic degradation, its main component be methane (account for 40~
70%) and carbon dioxide (about 30~60%), in addition also containing a small amount of hydrogen sulfide, moisture, ammonia, siloxanes, nitrogen, oxygen and
The compositions such as dust.
Carbon dioxide content in biogas is high, not only reduces the calorific value and combustion potential of biogas, and to natural gas line
Corrosiveness, therefore, the separation of carbon dioxide in methane and methane is realized, be the key that biogas is converted into bio-natural gas.
The conventional CO in methane purification field2/CH4Isolation technics includes pressure swing adsorption method (PSA), WATER-WASHING METHOD, chemical absorbing
Method, separation by deep refrigeration and membrane separation process, wherein pressure swing adsorption method, WATER-WASHING METHOD, chemical absorption method are due to equipment and technical matters
Comparative maturity, the market share in methane purification field is larger, but because pressure swing adsorption method separates CO2/CH4Technological process compared with
It is larger for complexity, equipment investment；WATER-WASHING METHOD and chemical absorption method and separation by deep refrigeration are for equipment corrosion resistance etc.
Technical requirements are high, and equipment and technology requirement and investment are higher.
Chinese patent CN101884871A discloses a kind of apparatus and method for of purifying carbon dioxide and fire damp separation,
The patent separates CO using pressure swing adsorption method2/CH4, this method is to drive carbon dioxide under stress on honeycomb filler
Adsorbed, filler is not to be adsorbed by modified activated carbon and modified zeolite, methane, obtains more pure methane gas
Body, negative pressure of vacuum withdrawing carbon dioxide desorption is recycled, reproducing adsorbent, the technological process of this method is complex, multi-tower continuous
Continuous operation, equipment investment and construction land are larger, and valve is frequently closed and opened, and maintenance cost is high, in terms of saving with environmental protection
Have much room for improvement.
WATER-WASHING METHOD is using water as solvent, and according to carbon dioxide and methane, deliquescent difference separates to reach gas in water
Purpose, it is more preferable than the dissolubility of methane in low temperature, carbon dioxide at high pressure.On absorption tower, carbon dioxide solubility in water, and
Methane increases in phase concentrations, until being discharged into subsequent technique from absorbing tower top after reaching refined product standard, leaves suction
The water for receiving tower is sent to flash tank, after reclaiming the portion of methane being dissolved in water, is contacted into desorber with air inversion, dioxy
Change carbon to be released, water is regenerated, and the water circulation after regeneration goes back to absorption tower and continues absorption operation.Washing process, on a large scale
Project investment is less, but needs pre-desulfurization and post processing drying process；Regeneration technology increases energy consumption；Periodically have a certain amount of
Discharge of wastewater.As Chinese patent CN102101001A discloses a kind of water-soluble solution removing carbon dioxide in methane and hydrogen sulfide
Device and method, using the solubility of carbon dioxide and hydrogen sulfide in water be higher than solubility of the methane in water principle,
Under 0.8-1.2Mpa, absorbed, obtain methane；Decompression regeneration, air stripping, water reusable edible.This method is simpler
Single, methane yield is higher, is easy to engineering construction, but the hydrogen sulfide gas in regenerative process is not handled, and is easily caused secondary
Pollution.
Chemical absorption method is be used as absorbent using amine liquid (MEA MDEA), and carbon dioxide occurs chemical with the amine in liquid phase
Reaction, because selectivity of chemical equation is very strong, so methane losses can be less than 0.1%.Because of carbon dioxide and happens is that of amine
Bonding is learned, therefore wants thermal regeneration, absorbent thermal regeneration, high energy consumption；Organic absorbent is due to pyrolysis or thermal polymerization and original
It is costly using needing to change for a period of time that oxygen in material can accelerate it reason, the organic absorbent such as to decompose.Such as China specially
Sharp CN101108988B discloses a kind of biogas cleaning equipment and its purification technique, a variety of amine of the technique using MDEA as main solute
The aqueous solution for activator is absorbing liquid, using hot recycling absorbing liquid, methane recovery ＞ 96%, contains H in purified gas2S ＜
5mg/m3.The method purified gas purity is higher, but uses ordinary-pressure absorption, and equipment volume is larger, and investment is higher, and is consumed using hot recycling
Can be higher.
Chinese patent CN101428190A discloses a kind of biogas purification method and its system, by Stress control less than first
Under the pressure of alkane hydrate generation, carbon dioxide and hydrogen sulfide is set to generate hydrate, methane is separated, then by decompression and is risen
Temperature, respectively obtain carbon dioxide and hydrogen sulfide gas.This method is fairly simple, but refrigeration, compression energy consumption are higher, operating cost
It is high.
Membrane separation process is that the dissolving diffusion rate using each gas component in high molecular polymer is different, thus in film two
It is caused to penetrate through the speed of fiber membranous wall difference and separate in the presence of the partial pressure difference of side.Membrane separation technique technological process letter
It is single, compact arrangement of equipment, save construction land, easy to operate, m of e is simple, without add chemical reagent or
Other will not cause environmental pollution, therefore membrane separation technique is in following big-and-middle-sized biogas engineering to the disagreeableness solvent of environment
The very potential technology of purification bio-natural gas.
Over nearly twenty or thirty year, both at home and abroad on CO2/CH4The research of seperation film can be divided into gas separation according to separating mechanism
Film, faciliated diffusion film and film absorber, the separative efficiency and the rate of recovery of film absorber are very high, but need to use water or chemical reagent
As adsorbent, secondary pollution can be caused to environment；Gas membrane Seperation Technology is under the driving of pressure, by each group in gas
Difference (i.e. infiltration rate difference) in the adsorption capacity and film divided on polymeric membrane surface in dissolving-diffusion is come in gas
The process that is separated of component.Under the pressure differential effect of film both sides, the comparatively faster gas of infiltration rate such as water steams gas
Gas, hydrogen, helium, hydrogen sulfide, carbon dioxide etc. pass through film and the per-meate side in film is enriched with (infiltration gas), and infiltration rate
Relatively slow gas, the delay side in film if methane, nitrogen, carbon monoxide, argon gas etc. are enriched with (impermeable gas), so as to
Reach separation purpose.Being presently used for the polymeric membrane of gaseous jet simulation mainly has polyolefin, cellulose family, polysulfones, polyamides sub-
Amine, organosilicon material and polysilicates etc., wherein Polyimide Hollow Fiber are because with operating pressure is high, flux is big, separation
The advantages such as coefficient height and enjoy favor.
However, containing certain impurity in most of unstripped gas, these impurity can be to the steady of film when carrying out UF membrane
Qualitative to have an impact, so that membrane module exists after a period of time is run, pressure drop is significantly increased, flux is substantially reduced, separation is imitated
The problems such as rate substantially reduces, and the film under long-term use of state is unable to reach expected service life substantially.
Utility model content
The defects of the purpose of this utility model is exactly to overcome present in prior art, there is provided a kind of marsh gas purifying is more
Class joins membrane separation device, it is characterised in that：Biogas storage tank, booster fan, U-shaped drying including passing sequentially through pipeline communication
Device, desulphurization system, distributor and film separation system, described film separation system are provided with two outlets, respectively permeate gas and go out
Mouth and impermeable gas outlet, described oozes vent outlet and CO2Retracting device is connected, impermeable gas outlet and product gas storage tank phase
Even, described product gas storage tank is connected with ring pumping unit.
Described ring pumping unit includes ring pump, compensator and heat exchanger, the output end of described ring pump and compensator it is defeated
Entering end to be connected, the output end of compensator is connected with the input of heat exchanger, and the output end of heat exchanger is connected with the input of ring pump,
And ring pump is connected with product gas storage tank.
Described heat exchanger is connected by pipeline with circulating cooling water inlet, and ring pump passes through pipeline and circulating cooling water out
It is connected.
Described film separation system includes multigroup membrane separation assemblies, and multigroup membrane separation assemblies are using series, parallel or go here and there simultaneously
Join a variety of cascading modes to set.
Described membrane separation assemblies are made up of multiple hollow-fibre membranes being connected in parallel, and described hollow-fibre membrane is using anti-
Plastify crosslinking Treatment.
The outlet pressure of described booster fan is not less than 0.2-0.35MPa.
The vacuum of described ring pump is 80-160mmHg or lower.
The abhiseca of described biogas storage tank is provided with temperature controller, pressure gauge, and described pressure gauge and flowmeter are all connected to
Detect on controller.
Flowmeter is provided between described biogas storage tank and booster fan, is provided between described biogas storage tank and flowmeter
Regulating valve.
Described temperature controller is connected on detection controller.
The utility model has the advantages that：
1st, the utility model (can also use other polymeric membrane materials) by taking Polyimide Hollow Fiber as an example, polyimides
After hollow fiber film is by the high temperature crosslinking Treatment such as high temperature, high pressure or vacuum, there is good thermostabilization, chemical stability, machine
Outside tool performance, filming performance, can selectivity reduction CO2Permeability, improve CO2/CH4Separation, strengthen membrane module
Service life.
2nd, the utility model membrane separation assemblies front end is pressurizeed using booster fan, is set in membrane separation assemblies rear end using ring pump
Standby to vacuumize, membrane separation assemblies avoid traditional pressure-variable adsorption while the efficiency and product yield of mass transfer separation is ensured
When method uses compressor the problem of system pressure big high energy consumption, equipment energy consumption is reduced, saves expense.
3rd, CH in product gas can obtain using multistage cascade UF membrane experiment4Content be not less than 98vol%, yield is not low
In 97%；The CO obtained simultaneously from second order film separation system side outlet2Content is not less than 99.9vol%, at low temperature recovery
Food-grade carbon-dioxide standard can be reached after reason.
Brief description of the drawings
Fig. 1 is the utility model polyimides hollow fiber membrane molecule structure chart；
Fig. 2 is structural representation of the present utility model；
Fig. 3 is the membrane module structure schematic diagram of second order tandem UF membrane of the present utility model experiment；
Fig. 4 is the membrane module structure schematic diagram of the multistage cascade UF membrane experiment of the present utility model.
Description of reference numerals：
1- biogas storage tank, 2- temperature control meters, 3- pressure gauges, 4- regulating valves, 5- flowmeters, 6- booster fans, 7-U types are dried
Device, 8- desulphurization systems, 9- distributors, 10- film separation systems, 11- products gas storage tank, 12- rings pump, 13- compensators, 14- heat exchange
Device, 15-CO2Retracting device, 16- circulating cooling water inlets, 17- circulating cooling water outs, 18- detection controllers.
Embodiment
Embodiment 1：
A kind of multistage cascade membrane separation device of marsh gas purifying, including pass sequentially through the biogas storage tank 1 of pipeline communication, supercharging wind
Machine 6, U-shaped drier 7, desulphurization system 8, distributor 9 and film separation system 10, described film separation system 10 are provided with two and gone out
Mouthful, vent outlet and impermeable gas outlet are respectively oozed, described oozes vent outlet and CO2Retracting device 15 is connected, impermeable
Gas outlet is connected with product gas storage tank 11, and product gas storage tank 11 is connected with ring pumping unit.
The experiment of single-order UF membrane is illustrated in figure 2, can be used alone in this experimental program with single membrane separation plant, also
Can 3 increase treating capacities in parallel, in this programme, first the biogas by enrichment of being fermented in biogas storage tank 1 is pressurizeed by booster fan 6
Afterwards, after removing oil drying into the U-shaped dehumidification of drier 7, the impurity such as moisture, oil and a small amount of inorganic solid particles are removed, then pass through
Cross the effective adsorbing and removing H of desulphurization system 82S, then entered biogas distribution in single-order film separation system pipeline by distributor 9, mixing
After gas enters film separation system, by CO2、CH4In adsorption capacity and film on polymeric membrane surface in dissolving-diffusion
Difference (i.e. infiltration rate difference), the comparatively faster carbon dioxide of infiltration rate passes through film and the per-meate side in film is enriched with
(infiltration gas), the carbon dioxide of gained high-purity can pass through pipe influx to CO2Being recycled in retracting device 15 can also be discharged into
Air；And the relatively slow methane of infiltration rate is enriched with (impermeable gas) in the delay side of film, methane gas is then in ring pumping unit
In the presence of enter product gas storage tank 11, obtained CH4Content is not less than 95.3vol% product gas, wherein CH4The rate of recovery
Between 65-80%, CH4Earning rate it is relatively low.
Embodiment 2：
On the basis of embodiment 1, a kind of multistage cascade membrane separation device of marsh gas purifying, including pass sequentially through pipeline communication
Biogas storage tank 1, booster fan 6, U-shaped drier 7, desulphurization system 8, distributor 9 and film separation system 10, described UF membrane
System 10 is provided with two outlets, respectively oozes vent outlet and impermeable gas outlet, described oozes vent outlet and CO2Recovery
Device 15 is connected, and impermeable gas outlet is connected with product gas storage tank 11, and product gas storage tank 11 is connected with ring pumping unit, described ring
Pumping unit includes ring pump 12, compensator 13 and heat exchanger 14, the output end of described ring pump 12 and the input phase of compensator 13
Even, the output end of compensator 13 is connected with the input of heat exchanger 14, the output end of heat exchanger 14 and the input phase of ring pump 12
Even, and ring pump 12 is connected with product gas storage tank 11.Described heat exchanger 14 is connected by pipeline with circulating cooling water inlet 16, ring
Pump 12 is connected by pipeline with circulating cooling water out 17.
The outlet pressure of described booster fan 6 is not less than 0.2-0.35MPa.
The vacuum of described ring pump 12 is 80-160mmHg or lower.
In the present embodiment, the film separation system is made up of two level membrane separation assemblies, and every grade of membrane separation assemblies are according to gas
Body flow needs to be formed in parallel by multiple hollow-fibre membranes again, and membrane separation assemblies at different levels are to be in series.In this programme, biogas
After booster fan supercharging of the outlet pressure not less than 0.2-0.35MPa, after removing oil drying into the U-shaped dehumidification of drier 7,
The impurity such as moisture, oil and a small amount of inorganic solid particles are removed, then by the effective adsorbing and removing H of desulphurization system 82S, then by dividing
Biogas distribution is entered second order series connection film separation system by orchestration 9, as shown in figure 3, described second order is connected, film separation system is by one
Rank membrane separation assemblies are combined with second order membrane separation assemblies tandem, and single order membrane separation assemblies are composed in series by two film separation units,
The impermeable gas outlet of the single order membrane separation assemblies connects with product gas storage tank 11, the infiltration gas of the single order membrane separation assemblies
Outlet connects with the air inlet of the second order membrane separation assemblies, and the second order membrane separation assemblies ooze vent outlet and CO2Recovery
Device 15 connects；The impermeable gas of the second order membrane separation assemblies exports is back to pre- pumping entrance by pipeline, passes through supercharging
Continue to reclaim into single order membrane separation assemblies after blower fan supercharging, in this experimental program, ring pumping unit is evacuated to 80-
160mmHg or lower, the methane gas that content is not less than 97.5vol% can be obtained, and the rate of recovery of methane is between 85-90%
Between, the overall income rate of methane is not very high.
Embodiment 3：
On the basis of embodiment 1, a kind of multistage cascade membrane separation device of marsh gas purifying, including pass sequentially through pipeline communication
Biogas storage tank 1, booster fan 6, U-shaped drier 7, desulphurization system 8, distributor 9 and film separation system 10, described UF membrane
System 10 is provided with two outlets, respectively oozes vent outlet and impermeable gas outlet, described oozes vent outlet and CO2Recovery
Device 15 is connected, and impermeable gas outlet is connected with product gas storage tank 11, and product gas storage tank 11 is connected with ring pumping unit, described ring
Pumping unit includes ring pump 12, compensator 13 and heat exchanger 14, the output end of described ring pump 12 and the input phase of compensator 13
Even, the output end of compensator 13 is connected with the input of heat exchanger 14, the output end of heat exchanger 14 and the input phase of ring pump 12
Even, and ring pump 12 is connected with product gas storage tank 11.Described heat exchanger 14 is connected by pipeline with circulating cooling water inlet 16, ring
Pump 12 is connected by pipeline with circulating cooling water out 17.
The abhiseca of described biogas storage tank is provided with temperature controller, pressure gauge, and stream is provided between biogas storage tank and booster fan
Gauge, regulating valve is provided between described biogas storage tank and flowmeter.Described temperature controller, pressure gauge and flowmeter is all connected to
Detect on controller.Can be to the pressure into membrane separation assemblies gas, temperature and flow are controlled.
Described film separation system includes multigroup membrane separation assemblies, and multigroup membrane separation assemblies are using series, parallel or go here and there simultaneously
Join a variety of cascading modes to set.Described membrane separation assemblies are made up of multiple hollow-fibre membranes being connected in parallel, hollow fibre
It is actually the microporous pipe with identical internal-and external diameter to tie up film, and its structure is similar to tubular heat exchanger.Fibre bundle is separate,
Film group both ends are carried out close with epoxy resin, and hundreds thousand of fibers are tied together for providing required surface area.Gas is in film two
Under the pressure differential effect of side, the comparatively faster gas of infiltration rate such as vapor, hydrogen, helium, hydrogen sulfide, carbon dioxide etc. are saturating
Cross film and the per-meate side in film is enriched with and goes out film separation system as infiltration conductance, and the gas that infiltration rate is relatively slow
Body, the delay side in film if the impermeable gas such as methane, nitrogen, carbon monoxide, argon gas is enriched with, it is achieved thereby that mixed gas
Separation.
Described desulphurization system is to carry out desulfurization process to the unstripped gas, is less than the total sulfur content in the unstripped gas
10ppm, further, described desulphurization system are the conventional structure in this area or its combination.
The ring pump is water ring vacuum pump, is the water ring formed by impeller, the pump housing, suction and discharge disk, water in pump housing inwall, inhales
The compositions such as gas port, exhaust outlet, auxiliary exhaust valve, impeller is arranged in the pump housing by bias, starts water ring vacuum pump, pump internal lobe
Wheel rotation, the water into the water ring pump pump housing throw to surrounding by impeller, due to the effect of centrifugal force, form rotation water ring, impeller
Blade and water ring form closing space, and due to the effect of centrifugal force, water forms equal thickness similar to pump chamber shape
The water ring of closing.The upper inside surface of water ring is just tangent with impeller hub, the lower inner surface of water ring just with blade tip
Contact (in fact, blade has certain insertion depth in water ring).Now, formd between impeller hub and water ring one month
Thread form space, and this space is divided into several small chambers equal with lobe numbers by impeller.If with 0 ° of the top of impeller
For starting point, then impeller is before rotation at 180 °, and the volume of small chamber gradually changes from small to big, and pressure constantly reduces, and and suction
Air entry on gas disk communicates, and when the pressure in small cavity space is less than the pressure taken out in container, is balanced according to gas pressure intensity
Principle, the gas taken out constantly are drawn into small chamber, are now in breathing process.Completely cut off when air-breathing is completed with air entry,
The volume of small chamber is just gradually reduced, and pressure constantly increases, and is now in compression process, when the gas of compression reaches row in advance
During atmospheric pressure, from auxiliary exhaust valve prerelease.And the volume of the small chamber communicated with exhaust outlet further reduces pressure and enters one
The rise of step, when the pressure of gas is more than drain pressure, gas compressed is discharged from exhaust outlet, in continuously running for pump
During, air-breathing, compression, exhaust process are constantly carried out, so as to reach the purpose continuously vacuumized.
In the present embodiment, biogas is after booster fan supercharging of the outlet pressure not less than 0.2-0.35MPa, into U
After the dehumidification of type drier 7 removes oil drying, the impurity such as moisture, oil and a small amount of inorganic solid particles are removed, then by desulfurization system
Unite 8 effective adsorbing and removing H2S, then distributes biogas by distributor 9 and enter more class's film separation systems, as shown in figure 4, this experiment
In scheme, described more class's film separation systems are by single order membrane separation assemblies, second order membrane separation assemblies and three rank membrane separation assemblies
Separately positioned by three-level, the impermeable gas outlet of single order membrane separation assemblies is connected with the air inlet of second order membrane separation assemblies, second order
The impermeable gas outlet of membrane separation assemblies connects with product gas storage tank 11, and the product gas of single order membrane separation assemblies enters second order film point
After component, process isolated high concentration methane product gas again；Single order membrane separation assemblies ooze vent outlet and three rank films point
Air inlet from component connects, after further separating and recovering methane therein, retention gas backflow；Second order membrane separation assemblies ooze
Vent outlet connects with the air inlet of three rank membrane separation assemblies, and three rank membrane separation assemblies ooze vent outlet and second order UF membrane group
Part air inlet connection, second order membrane separation assemblies discharge gas and three-level film group retention gas mixing after, be back to it is pre- be pressurized into
Mouthful, you can to continue the methane that recovery wherein remains, and play a part of adjusting charge flow rate simultaneously；Three rank film membrane separation assemblies
Ooze vent outlet and CO2Retracting device 15 connects, in this experimental program, ring pumping unit be evacuated to 80-160mmHg or
Lower, the outlet of single order film separation system target gas and second order film separation system cascade arrangement, second order target gas exported product gas can
The methane gas that content is not less than 98.0vol% is obtained, second order film separation system side outlet product gas is recycled to single order UF membrane
System entrance improves the product purity and yield (CH in product gas of target gas by circulation mass transfer separation4Content be not less than
98vol%, yield is not less than 97%).Wherein single order film separation system side outlet discharge gas is recycled into next by air-introduced machine
Rank film separation system, in the CO after the separation of second order film separation system, obtained from second order film separation system side outlet2Content is not
Less than 99.9vol%, the side outlet can reach food-grade carbon-dioxide standard after low temperature recycles.
In the front end of multistage membrane separation device using booster fan pressurization mass transfer enhancement barometric gradient, in multistage film point
From ring pumping unit is set between the rear end of device and product gas storage tank, the resistance to mass tranfer of film rear end gas phase separation is reduced, enhancing is situated between
Plasma membrane mass transfer efficiency and permeability, and seperation film takes multiple anti-plastifying technology processing, effectively prevent the modeling of seperation film
Change, add the service life of membrane separation assemblies.
The utility model can be used for biomass producing methane, rubbish landfill gas, sewage treatment plant, food processing fermentation waste,
Methane purification caused by the fermentation such as agricultural wastes, the treatment scale of biogas can be from tens cubic metres to tens thousand of cubes per hour
Rice, after multistage cascade UF membrane purification, obtained CO2Content is not less than 99.9vol%, can be with after low temperature recycles
Reach food-grade carbon-dioxide standard；Methane content of bilogas >=95.7vol% (reaches as high as 98vol%, yield reaches
97%) two class natural gas standards, are can reach, municipal gas ductwork is incorporated to and substitutes petrochemical industry natural gas, also can cogeneration of heat and power biogas hair
Electricity.
Embodiment 4：
On the basis of above-described embodiment, described film separation system 10 includes multigroup membrane separation assemblies, multigroup UF membrane
Component is set using series, parallel or a variety of cascading modes of connection in series-parallel.Described membrane separation assemblies are connected in parallel by multiple
Hollow-fibre membrane composition, the hollow-fibre membrane can be Polyimide Hollow Fiber, cellulose acetate hollow-fibre membrane,
Dimethyl silicone polymer hollow-fibre membrane, ps hollow fiber uf membrane, PEI hollow-fibre membrane, polyphenylene oxide doughnut
Film, makrolon hollow-fibre membrane etc..
Polymer is in CO2/CH4Plasticizing phenomenon, i.e. CO under specified temp in separation process be present2Partial pressure reach certain value
Afterwards, CO2Molecule can adsorb dissolving, the CO of absorption in polymer film2The accumulation of macromolecular chain in polymer film will be destroyed, make to gather
Swelling (as shown in Figure 1), CO occur for compound film2And CH4All significantly improved, caused by the permeability of hollow-fibre membrane after plasticizing
The CO of film2/CH4Separation reduces, and the purity and yield of product can all be greatly reduced.Hollow fiber described in the utility model
Film uses anti-plasticizing crosslinking Treatment, including is not limited to extension and the extension of method mentioned below, the anti-plasticizing of hollow fiber film
Processing can be one or more kinds of combinations of following methods：
Method one：10-15min of high-temperature process, temperature range are 280-360 to polyimides hollow fiber film in atmosphere
DEG C or at higher temperature be preferred；
Method two：Polyimides hollow fiber film 20-40min of high-temperature process under vacuum, temperature range 200-
320 DEG C or lower temperature are preferred；
Method three：Polyimides hollow fiber film under argon gas or other atmosphere of inert gases high-temperature process 10-
25min, temperature range are that 180-280 DEG C or higher temperature are preferred；
Method four：Polyimides hollow fiber film penetrates 10-24h by UV illumination or the longer time is preferred；
It the above is only preferred embodiment of the present utility model, the scope of protection of the utility model is not limited merely to above-mentioned
Embodiment, all technical schemes belonged under the utility model thinking belong to the scope of protection of the utility model.It should be pointed out that pair
For those skilled in the art, some improvements and modifications under the premise of the utility model principle is not departed from,
It should be regarded as the scope of protection of the utility model.
Claims (10)
- A kind of 1. multistage cascade membrane separation device of marsh gas purifying, it is characterised in that：Biogas including passing sequentially through pipeline communication stores up Tank (1), booster fan (6), U-shaped drier (7), desulphurization system (8), distributor (9) and film separation system (10), described film Piece-rate system (10) is provided with two outlets, respectively oozes vent outlet and impermeable gas outlet, it is described ooze vent outlet with CO2Retracting device (15) is connected, and impermeable gas outlet is connected with product gas storage tank (11), described product gas storage tank (11) and ring Pumping unit is connected.
- A kind of 2. multistage cascade membrane separation device of marsh gas purifying according to claim 1, it is characterised in that：Described ring pump Equipment includes ring pump (12), compensator (13) and heat exchanger (14), and product gas storage tank (11) is connected with ring pump (12), described ring The output end of pump (12) is connected with the input of compensator (13), the output end of compensator (13) and the input of heat exchanger (14) It is connected, the output end of heat exchanger (14) is connected with the input of ring pump (12).
- A kind of 3. multistage cascade membrane separation device of marsh gas purifying according to claim 2, it is characterised in that：Described heat exchange Device (14) is connected by pipeline with circulating cooling water inlet (16), and ring pump (12) passes through pipeline and circulating cooling water out (17) phase Even.
- A kind of 4. multistage cascade membrane separation device of marsh gas purifying according to claim 1, it is characterised in that：Described film point Include multigroup membrane separation assemblies from system (10), multigroup membrane separation assemblies use series, parallel or a variety of cascadings of connection in series-parallel Mode is set.
- A kind of 5. multistage cascade membrane separation device of marsh gas purifying according to claim 4, it is characterised in that：Described film point It is made up of from component multiple hollow-fibre membranes being connected in parallel, described hollow-fibre membrane uses anti-plasticizing crosslinking Treatment.
- A kind of 6. multistage cascade membrane separation device of marsh gas purifying according to claim 1, it is characterised in that：Described supercharging The outlet pressure of blower fan (6) is not less than 0.2-0.35MPa.
- A kind of 7. multistage cascade membrane separation device of marsh gas purifying according to claim 2, it is characterised in that：Described ring pump (12) vacuum is 80-160mmHg or lower.
- A kind of 8. multistage cascade membrane separation device of marsh gas purifying according to claim 1, it is characterised in that：Described biogas The abhiseca of storage tank (1) is provided with temperature controller (2), pressure gauge (3), and described temperature controller (2) and pressure gauge (3) are all connected to detect On controller (18).
- A kind of 9. multistage cascade membrane separation device of marsh gas purifying according to claim 1, it is characterised in that：Described biogas Flowmeter (5) is provided between storage tank (1) and booster fan (6), is provided with and adjusts between described biogas storage tank (1) and flowmeter (5) Save valve (4).
- A kind of 10. multistage cascade membrane separation device of marsh gas purifying according to claim 9, it is characterised in that：Described stream Gauge (5) is connected on detection controller (18).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110394056A (en) * | 2019-08-30 | 2019-11-01 | 华能国际电力股份有限公司 | Industrial boiler flue gas dehumidification, desulfurization and denitrification system and method |
| CN111974175A (en) * | 2020-05-20 | 2020-11-24 | 迈特尔膜技术有限公司 | Method and equipment for extracting helium from natural gas by membrane method |
| CN115608119A (en) * | 2021-07-12 | 2023-01-17 | 中国科学院大连化学物理研究所 | Biological methane decarburization integrated device and method thereof |
-
2016
- 2016-09-29 CN CN201621092235.9U patent/CN206646081U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110394056A (en) * | 2019-08-30 | 2019-11-01 | 华能国际电力股份有限公司 | Industrial boiler flue gas dehumidification, desulfurization and denitrification system and method |
| CN110394056B (en) * | 2019-08-30 | 2024-06-07 | 华能国际电力股份有限公司 | Industrial boiler flue gas dehumidification, desulfurization and denitrification system and method |
| CN111974175A (en) * | 2020-05-20 | 2020-11-24 | 迈特尔膜技术有限公司 | Method and equipment for extracting helium from natural gas by membrane method |
| CN115608119A (en) * | 2021-07-12 | 2023-01-17 | 中国科学院大连化学物理研究所 | Biological methane decarburization integrated device and method thereof |
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