CN100358609C - Coalbed gas condensation method - Google Patents
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- CN100358609C CN100358609C CNB200510047624XA CN200510047624A CN100358609C CN 100358609 C CN100358609 C CN 100358609C CN B200510047624X A CNB200510047624X A CN B200510047624XA CN 200510047624 A CN200510047624 A CN 200510047624A CN 100358609 C CN100358609 C CN 100358609C
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Abstract
The present invention relates to a concentration method of coal seam gas, more specifically, the present invention relates to a method for concentrating CH4 in coal seam gas and recovering N2 for comprehensive utilization by pressure swing adsorption and membrane separation. The method comprises pressure swing adsorption and membrane separation, wherein the pressure swing adsorption comprises the following technological parameters: the pressure of pressurization adsorption is in the range from 0.8 to 2.4MPa, the pressure of pressure reduction desorption is in the range from 0.1 to 0.02MPa, and the temperature is from 4 to 25 DEG C; the membrane separation comprises the following technological parameters: hole diameters of membranes are smaller than 0.01 mu m, a ratio of high pressure to low pressure is larger than 4, the raw gas pressure is higher than 200Pa, and the raw gas temperature is below 25 DEG C. Through the steps, CH4 in the purity from 50 to 95% can be obtained. The present invention combines pressure swing adsorption and membrane separation, CH4 is concentrated, N2 is recovered, and comprehensive utilization of pumping and exhausting coal seam gas in low concentration is realized. The present invention can realize the comprehensive utilization of resources of the coal seam gas, and has important economic and environmental significance of improving and optimizing energy structures, ensuring safety production of coal mines, lowering production cost of coal mines and reducing atmospheric pollution.
Description
Technical field
The present invention relates to a kind of method for concentration of coal bed gas, be specially, realize that coal bed gas concentrates CH by adopting transformation absorption and membrane separation technique
4With recovery N
2Comprehensive utilization method.
Background technology
China's coal bed gas (claiming coal mine gas again) total resources is 35 tcms, and is about the same with the reserves of natural gas, occupies the third place in the world.Coal bed gas is a kind of energy, is again a kind of main greenhouse gases.The coal bed gas resource comprehensive utilization is for improvement and optimize energy resource structure, ensure Safety of Coal Mine Production, reduce the Coal Production cost, reduce atmosphere pollution has important economy and Significance for Environment.
Coal bed gas mainly consists of methane as a kind of energy of high-quality cleaning.The calorific value of methane is 33.5-33.7J (8000-9000kcal/m
3).By calorific value calculation, roughly 1000m
3Methane is equivalent to the 1t standard coal.In the disposable energy deficiency of current China, the exploitation coal bed gas resource is significant.China's gas utilization is to be used for civilian to methane concentration in the coal bed gas more than 35% basically at present.Coal bed gas for low-concentration methane mainly is in the discharging atmosphere.
Coal bed gas is as a kind of greenhouse gases, also is serious to the infringement of environment.At present be higher than the utilization that can directly act as a fuel of 35% coal bed gas for methane concentration.But be lower than 30% partial discharge in atmosphere for methane concentration.Not only waste a large amount of energy, also polluted atmospheric environment.The methane gas temperature effect is bigger 20 times than carbon dioxide.Methane enters atmosphere, not only because of its greenhouse effects cause unusual weather conditions, also consumes the ozone in the atmospheric advection layer, is 7 times of carbon dioxide to the depletion of the ozone layer ability.China accounts for world's coal mining discharging methane total amount 1/3 because of coal mining to the methane content of airborne release every year, occupies first place in the world.Stipulated the reduction of greenhouse gas discharge amount of various countries in " Kyodo Protocol book ".The obligation of oneself will conscientiously be fulfiled as signatory state by China.Obviously, will face urgent and huge pressure to the coal bed gas control emission.
The coal bed gas comprehensive utilization value is very high, except that civilian, can be used for gas turbine power generation, heat supply, the fuel that is used as power after compressing and liquefying, and also can do chemical products such as methyl alcohol, synthetic ammonia, also is the basic material of organic chemical industry's products such as agricultural chemicals, medicine, dyestuff.
In general, the coal bed gas concentration of extracting out from the goaf of mine main is lower, and contains more impurity, and good in coal bed gas concentration height, the quality of unminding the production of area employing ground drilling.The coal bed gas of mean quality is fit to local civilian or confession well head gas power plant.High-quality coal seam is fit to enter the natural gas line system, is transported to distant place user, supplies other big cities resident, high-power station, chemical fertilizer factory and chemical plant and uses.
The gas utilization system generally is made up of gas pump, gas jar, voltage regulating station and gas pipeline.China has two class coal bed gas supply systems at present; One class is a low pressure one-level supply system, and coal bed gas pressure maintains more than the 2000Pa; Another kind of be in, the low pressure feed system, middle pressure is 35000Pa, low-pressure 2000Pa.In the ordinary course of things, the air pressure in the gas jar is 5000-6000Pa.
1, the civilian primary condition of coal bed gas is:
-enough sources of the gas, stable air pressure, when being used for cooking, air pressure should be greater than 2000Pa; Methane concentration 35-40%.
There is not objectionable impurities in the-admixture of gas;
-perfect gas storage and conveying facility.
2, generating
Coal bed gas replaces the coal power generation heat supply can not only alleviate environmental pollution, and can improve the thermal efficiency.
3, motor vehicle fuel (gas)
Automobile is the important pollution sources that cause atmosphere pollution, and they discharge CO, hydrocarbon and nitrogen oxide.
Diesel vehicle is discharged particle also.Along with vehicle constantly increases, as the shortage that will become of the oil of main fuel.Natural gas is very favourable to environment, because it can reduce the discharging of all contaminants of vehicle discharge.Therefore, economy and the environmental benefit of using methane to act as a fuel is fairly obvious.
Technological parameter as the compressed natural gas of motor vehicle fuel is: methane concentration is 90-100%; The above hydrocarbon content of ethane is no more than 6-5%.Because methane is the main component of coal bed gas, through enrichment, methane concentration rises to 95%, and the hydrocarbon content more than the ethane is very little.Therefore coal bed gas extremely is suitable for producing compressed natural gas as motor vehicle fuel.
The methane concentration of the low concentration coal bed gas of iron coal group discharging is between 10-30%.Annual discharge capacity 5000 ten thousand steres of the low concentration coal bed gas of extraction at present (pressing pure methane calculates), can use every year for 250,000 residents.Iron coal group coal bed gas reserves are 293 billion cubic meters, calculate by 30% sucrose extraction, can be for about 90 billion cubic meters of coal bed gas that utilize (pressing pure methane calculates).The iron processes mining area can utilize coal bed gas to be equivalent to 1,350 ten thousand tons of coals.Simultaneously, the gas that also can fully utilize has nitrogen.At present, coal bed gas 8000 ten thousand steres (pressing pure methane calculates) are extracted in annual down-hole, iron processes mining area, and the ratio that methane concentration reaches more than 40% only accounts for 40%.Low concentration extraction coal bed gas concentrates, recycles is the unique channel that solves the air feed deficiency.Whole nation colliery extraction coal bed gas discharge capacity reaches more than tens billion cubic meters.The demand of the energy and environment requirement make the utilization of low concentration coal bed gas very urgent.
Main in the world concentrated extraction coal bed gas technology has at present:
(1) with N
2With CH
4The prior art of separating adopts low temperature process usually, and infrastructure investment is big, and economy (millions of m just when separating mass air flow only
3/ d).Yet many process of enriching are in the different research and development stages, and they can be used to handle 300,000 m economically
3The following gas of/d, so these technologies can be used in the colliery.Some of them technology is special in the N that removes in the natural gas
2, but at O
2Under the condition that exists, their functions or unknown number.
(2) Mehra technology utilization hydrocarbon solvent is removed N
2This technology is verified at the scene, it is reported that its operating cost is than low temperature process low 15%.If this technology can be handled O
2, it can handle 4200-8500m economically so
3The medium CH of/d
4The coal bed gas of concentration.
(3) Bend research institution adopts the Metal Substrate liquid-absorbant to remove CH
4In N
2According to experimental result, CH
4The processing cost of mist is 19 dollars/km
3, and estimate to drop to 11 dollars/km
3But this technology is not carried out field trial as yet at present.
(4) Nitrotec engineering company has developed pressure swing adsorption technique.This technology utilization carbon molecular sieve is from N
2And O
2Middle absorption CH
4, utilize natural zeolite with CH
4N in the mixture
2And O
2Adsorb.China PSA concentrates CH
4Technology is patented technology (patent No. 85103557.4), and this technology can be with coal mine mash gas CH
4Concentration is brought up to 50-95% from 20%.CH after concentrating
4Calorific value obviously improves, and can be used as high-grade fuel and industrial chemicals.
Transformation adsorbed gas isolation technics is compared with the cryogenic refrigeration method, has small investment, easy and simple to handle, the energy is economized, cost is low advantage: compare with membrane separation process, and the gas purity height of extraction, energy consumption is low.The pressure swing adsorption advantage: the one, cheap gas can be provided, the 2nd, can utilize waste gas, turn waste into wealth, eliminate and the minimizing environmental pollution.
(5) gas membrane Seperation Technology is a kind of emerging chemical separation technology.Micro-filtration, dialysis, electrodialysis, artificial kidney, counter-infiltration, ultrafiltration, gas separation, inoranic membrane, infiltration evaporation, liquid film, control release and film contact, film are selected technology such as answering device and are widely used in fields such as oil, chemical industry, environmental protection, the energy, electronics, food, medicine and bioengineering at present.Film is as a kind of advanced person's isolation technics, have that separation accuracy height, permeability height, selectivity are strong, normal temperature down the no phase-state change of operation, energy consumption is low, pollution is little.Be applicable to from gaseous mixture and separate and concentrated gas.Adopt membrane technology exploitation N
2And CH
4The diffusion barrier aspect does not also have the report of success, must further further investigate.
In sum, the utilization for low concentration extraction coal bed gas still is in the primary research stage.
Summary of the invention
The object of the present invention is to provide a kind of coalbed gas condensation method, adopt transformation absorption and membrane separation technique, realize that low concentration extraction coal bed gas concentrates CH
4With recovery N
2Comprehensive utilization, realized also simultaneously that the mining area coal bed gas is efficient to utilize and environmental protection.
Technical scheme of the present invention is:
A kind of coalbed gas condensation method comprises that transformation absorption separates with film;
Described pressure swing adsorption technique parameter is as follows: the pressure of pressurization absorption is controlled in the 0.8-2.4MPa scope, and the pressure of depressurization desorption is controlled in the 0.1-0.02MPa range of negative pressure, temperature 4-25 ℃; Adsorb N by transformation
2Separate;
Described membrane separation process parameter is as follows: membrane aperture is＜0.01 μ m, and high pressure and low-pressure ratio are＞4, raw gas pressure＞200Pa, unstripped gas temperature＜25 ℃; Separate CH by film
4, CO
2, O
2O in three kinds of gas
2Separate, remove CO by chemical method again
2
Described transformation absorption separates sequentially with film to be carried out; By above-mentioned steps, obtain CH
4Purity reach 50-95%.
It is as follows that described film separates preferable technological parameter: membrane aperture is 0.01-0.001 μ m, and high pressure is 0.8-2.4MPa, and low pressure is 0.2-0.6MPa, raw gas pressure 200Pa-2000Pa, 4-25 ℃ of unstripped gas temperature.
Described film separates the film that adopts and comprises doughnut or rolled film, diameter range: 20-300mm, length range: 150-3000mm.
The adsorbent of described transformation absorption is zeolite molecular sieve or carbon molecular sieve.
Described carbon molecular sieve is the carbon molecular sieve of macropore, excessive hole, micropore or ultramicropore.
The invention has the beneficial effects as follows:
(1) the present invention adopts transformation absorption and membrane separation technique to be used in combination, and concentrates CH
4And recovery N
2, realize the comprehensive utilization of low concentration extraction coal bed gas.Adopt pressure swing adsorption, can make in the coal bed gas methane concentration bring up to 50-95% by 10-25%; Adopt membrane separation technique, methane concentration is brought up to more than 50% by 10-25%.
(2) the present invention fully utilizes coal bed gas resource, has important economy and Significance for Environment for improvement and optimization energy resource structure, guarantee Safety of Coal Mine Production, reduction Coal Production cost, minimizing atmosphere pollution.
Description of drawings
Fig. 1 is CH in the coal bed gas
4, O
2, N
2And CO
2The Line Chart of four kinds of main gas contents (volume ratio).
Fig. 2 is CH in the coal bed gas
4, O
2, N
2And CO
2The pie chart of four kinds of main gas contents (volume ratio).
Fig. 3 is CH in the coal bed gas
4, O
2, N
2And CO
2The correlation of four kinds of main gas contents (volume ratio).
Fig. 4 is CH in the coal bed gas
4, N
2The correlation of gas content (volume ratio).
Fig. 5 arranges general precedence diagram for the principle and the infiltration rate of air penetrating film.
Fig. 6 separates the groundwork schematic diagram for film.
The specific embodiment
Except that special indicating, content, concentration, purity are percent by volume among the present invention.
The gas composition analysis of coal bed gas:
The coal bed gas main component that goaf or stope are extracted out under the big grand mine is: CH
4, CO
2, CO, C
2H
4, C
2H
6, N
2, O
2, wherein CO, C
2H
4, C
2H
6Content is seldom in coal bed gas for three kinds of gas.
The main gas of coal bed gas is CH
4, O
2, N
2And CO
2, analyzing by the coal seam that big Long Kuang is extracted out, the result learns from above analysis shown in Fig. 1-4, from total body burden, N
2Content accounts for main body, CH
4Average content compares O
2High slightly, CO
2Minimum.
From correlation, N
2And CH
4Relation linear, i.e. N
2Content is during from the 0-78% left and right sides, CH
4Content be even distribution basically from 80%-0, concentrated relatively when having only 0-25%, O
2Content mainly concentrate on this scope of 0-20%, not with N
2, CH
4Content big relatively variation is arranged.
Therefore, in concentrated coal bed gas process, as long as the N in the mist
2Separate CH
4Concentration will be linearity and increase.
At the composition and the character of iron coal group extraction coal bed gas, the present invention is a research contents with transformation absorption and membrane separation technique, carries out transformation absorption earlier, carries out film again and separates, and realizes concentrating CH
4---reclaim N
2The target of comprehensive utilization.
(1) transformation absorption concentrates
(1) research performance of the adsorbent mainly carries out the absorption of gas isothermal, molecular sieve composite construction, antipollution, anti-efflorescence research to zeolite molecular sieve, carbon molecular sieve.
Transformation adsorbed gas isolation technics is the new gas isolation technics of a certain gas of separation and Extraction or some gas component of enrichment from admixture of gas, adsorption cleaning is to utilize different component different solubility or adsorbent generation selection chemical reaction in adsorbent in the admixture of gas, a kind of component or various ingredients surface quality are adsorbed on the surface of solids, and the key of adsorption cleaning need be determined effective adsorbent.Adopt activated carbon, activated alumina, silica gel, zeolite molecular sieve etc. at present.Adsorbent of the present invention mainly adopts zeolite molecular sieve or carbon molecular sieve.
Zeolite molecular sieve is artificial synthetic aluminium silicate salt crystal, loses the crystallization water after being heated to it to a certain degree, forms very big specific area.This adsorbent is made of ion hole and the electronegative key institute of sial, and polar molecule and unsaturated bond molecule are had very high selectivity; To N
2Have higher suction-operated, the hole size is 0.3 * 10
-9-1 * 10
-9M, specific area is 200-750m
2/ gram.
Carbon molecular sieve is processed by coal.By a series of activities such as oxidation of coal, dry coal pulverizing, charings, be processed into have macropore, the excessive carbon molecular sieve of hole, micropore and ultramicropore, the pore size of large pore molecular sieve is respectively 10
-7-10
-5M, excessively the pore size of porous molecular sieve is respectively 2 * 10
-9-10
-7M, the pore size of micro porous molecular sieve is respectively 10
-9-2 * 10
-9M, the pore size of super micro porous molecular sieve is respectively less than 0.7 * 10
-9M; Specific area is 1800-2345m
2/ gram.The macropore carbon molecular sieve shows that to the isothermal absorption current experiments of gas with various carbon molecular sieve is to CO
2, CH
4Suction-operated apparently higher than N
2, the micropore that nitrogen molecular passes carbon molecular sieve is adsorbed and needs the long period.
(2) pressure swing adsorption technique is selected
The principle of transformation absorption is to implement cyclic process by pressurization absorption, depressurization desorption, adopts the multitower blocked operation, the implementation procedure serialization.Need study the process conditions of pressurization absorption, depressurization desorption, to obtain from the extraction coal bed gas, concentrating CH
4Appropraite condition.Realize the CH of mist
4Concentration is more than 50%.Study special airflow diffuser, the molecular sieve powder phenomenon-tion of having avoided the high gas flow high speed impact to cause.Molecular sieve multiple-hearth structure, the protection molecular sieve is not subjected to the pollution of little oil and moisture, helps the service life in later stage of molecular sieve.Concrete technological parameter is as follows:
The pressure of pressurization absorption is controlled in the 0.8-2.4MPa scope, and the pressure of depressurization desorption is controlled in the 0.1-0.02MPa scope, and temperature 4-25 ℃, the unstripped gas oil content is less than 0.5ppm.
(2) concentrate CH
4Film separates
1, membrane technology is exactly that selection by film sees through the purpose that reaches separating mixture.Technically, mixed flow enters the two kinds of logistics of can coming out behind the membrane separator, i.e. osmotic flow and concentrate stream, osmotic flow contain the more easily chemical constituent by film, contains the more chemical constituent that is difficult for by film and concentrate stream.
The advantage of membrane separation technique is: obvious energy conservation, environmental friendliness, easy and simple to handle, flexible design, saving space, operation are economical.
Utilizing membrane separation technique is exactly the N in the coal bed gas
2Separate, improve CH in the mist
4Content, can be if re-use membrane technology CH
4, CO
2, O
3O in three kinds of gases
2Separate, eliminate a spot of CO by chemical method
2, then can obtain high-purity C H
4, be with a wide range of applications after coal bed gas is concentrated.
Adopting the membrane technology key influence factor is the aperture of film.The membrane separator reason has two aspects: the one, and sieving actoion, promptly film sees through fenestra to filtration gas molecule littler than membrane aperture under pressure differential promotes of component.Gas molecule greater than membrane aperture then is trapped.The size and shape of fenestra determines its separating property.The 2nd, sorption, different membrane materials is to middle particle rejection difference.Thereby to study the performance parameter of film divided gas flow, comprise temperature, pressure, membrane area, thickness and selectivity.Membrane module of the present invention has model film kinds such as rolling and hollow-fibre membrane can satisfy project demand; Diameter range: 20-300mm is as 30mm, 50mm, 100mm, 200mm, 250mm; Length range: 150-3000mm is as 200mm, 500mm, 1000mm.
The polymeric membrane basic principle of separating as shown in Figure 5, the high-pressure side and the low-pressure side that are the polymeric membrane both sides must have pressure differential, so two kinds of modes of operation of malleation and negative pressure are arranged, require the high voltage/low voltage ratio generally greater than 4 (high pressure is 0.8-2.4MPa, and low pressure is 0.2-0.6MPa).Membrane aperture is＜0.01 μ m (being preferably 0.01-0.001 μ m), raw gas pressure＞200Pa (being preferably 200Pa-2000Pa), unstripped gas temperature＜25 ℃ (being preferably 4-25 ℃), raw gas flow 0-8890m
3/ h, product gas and exhaust gas flow are 0-4000m
3/ h, gas separates by dissolving, diffusion, desorb.Enter film gas requirement particulate less than 0.1 μ m, oil content is less than below the 0.5ppm, and dew-point temperature is lower more than 25 degrees centigrade than atmospheric temperature.By infiltration rate to arranging general order slowly be: H by fast
2O, H
2, CO
2, O
2, Ar, CO, CH
4, N
2
The general technology step is as follows: unstripped gas enters the film system through filtration system elimination particulate etc. to be separated, and a part is a product gas, and another part is a waste gas, and according to product and environmental requirement, product gas can also separate with waste gas or circulation etc. again.
Gas separation membrane that the present invention adopts and equipment source are in Dalian Inst of Chemicophysics, Chinese Academy of Sciences " membrane technology national project research center ", this center is one of company of main process gas diffusion barriers of global at present 4 families and equipment, and existing at present hundreds of covering devices at home and abroad come into operation.Its groundwork principle is as shown in Figure 6:
Concentrate index: original gas CH
4Concentration is at 10-25%, concentrated gas CH
4Concentration 50%.
(3) technical Analysis
1, gas membrane Seperation Technology is a kind of new separation technology, has that energy consumption is low, reduced investment, floor space is little and characteristics such as easy to use, is used widely in petrochemical industry industry.Present multiple polymeric membrane has bigger infiltration rate and stronger selection separation property to gas, is fit to separate and concentrated gas from gaseous mixture.Pressure swing adsorption (PSA) has been used for N always since 1%1 years realize industrialization
2Purify.It on technological requirement comparative maturity.Basic principle is to utilize gas to reach gas purification in the difference of the rate of adsorption or the difference of adsorption capacity.By selecting to be applicable to CH
4, N
2Molecular sieve realize to concentrate coal bed gas be feasible.There are zeolite molecular sieve, carbon molecular sieve etc. available in the market.8890m during an equipment air inlet
3/ h, CH
4Concentration 30%, product tolerance 4000m
3/ h, CH after the enrichment
4Concentration reaches 42%, and wherein power consumption 250kw takes up an area of less than 50m
3, film system (about membrane module ordinary life 10 years, the longest reaching 17 years also in operation, non-maintaining), about 4,000,000 yuan of price, setting height(from bottom) is estimated 540,000 yuan.
2, market analysis
Extraction coal bed gas in colliery is as a kind of high-quality clear energy sources, and recycling has good market prospects.Existing CH
4Concentration is to only accounting for 40% more than 40%.Concentration technique is to improve the unique channel that gas utilization is worth.China's not high main cause of extraction gas utilization technical merit is the technology shortcoming, causes a large amount of low concentration extraction coal bed gas to emit in vain.Whole nation low concentration coal bed gas concentration technique has vast market.As long as coal mining, the utilization of low concentration coal bed gas is permanent problem.Under the situation of the disposable energy deficiency of current China, the development and utilization of coal bed gas resource is significant for alleviating China's energy supply pressure.
3, Economic and Efficiency Analysis
In the iron processes mining area is example.At present ground, iron processes mining area coal bed gas extraction pumping plant is 11, surplus the extraction equipment 60, and actual extraction ability 4200m
3More than/the min, extraction 8,004 ten thousand m in 2004
3(scale) estimates 7,500 ten thousand m this year
3(scale), a year extraction ability reaches 5.2 hundred million m
3, can satisfy the needs that cbm development utilizes.The pipeline of ground air feed utilization networking at present 100km, air accumulator area 10.76 ten thousand m
3, nearly 100,000 families of gas utilization resident.
Realize civilian coal bed gas 600,000 m
3The requirement of/d is built the air guide of low concentration coal and is concentrated one at station, and 8 of thickeners are invested 3,600 ten thousand yuan.Other conveyance system comprises needs construction volume of gas storage tank 300,000 m
3, need 3,000 ten thousand yuan of infusion of financial resourcess.Need to lay pipeline 100km, need 1,000 ten thousand yuan of funds.About 1.16 hundred million yuan of gross investment.
Year is utilized coal bed gas (CH
4Concentration 50% is calculated) 200,000,000 m
3, a year sale is received and is reached 200,000,000 yuan (1 yuan/m
3Coal bed gas, CH
4Concentration 50%), 2-3 payoff period of fund.
Claims (5)
1, a kind of coalbed gas condensation method is characterized in that: comprise that transformation absorption separates with film;
Described pressure swing adsorption technique parameter is as follows: the pressure of pressurization absorption is controlled in the 0.8-2.4MPa scope, and the pressure of depressurization desorption is controlled in the 0.1-0.02MPa range of negative pressure, temperature 4-25 ℃; Adopt zeolite molecular sieve absorption and carbon molecular sieve to carry out transformation absorption respectively, adsorb N by transformation
2Separate;
Described membrane separation process parameter is as follows: membrane aperture is＜0.01 μ m, and high pressure and low-pressure ratio are＞4, raw gas pressure＞200Pa, unstripped gas temperature＜25 ℃; Separate CH by film
4, CO
2, O
2O in three kinds of gas
2Separate, remove CO by chemical method again
2
2, according to the described coalbed gas condensation method of claim 1, it is characterized in that: described transformation absorption separates sequentially with film to be carried out; By above-mentioned steps, obtain CH
4Purity reach 50-95%.
3, according to the described coalbed gas condensation method of claim 1, it is characterized in that described membrane separation process parameter is as follows: membrane aperture is 0.01-0.001 μ m, and high pressure is 0.8-2.4MPa, and low pressure is 0.2-0.6MPa, raw gas pressure 200Pa-2000Pa, 4-25 ℃ of unstripped gas temperature.
4,, it is characterized in that described film separates the film that adopts and comprises doughnut or rolled film, diameter range: 20-300mm, length range: 150-3000mm according to claim 1 or 3 described coalbed gas condensation methods.
5, according to the described coalbed gas condensation method of claim 1, it is characterized in that: described carbon molecular sieve is the carbon molecular sieve of macropore, excessive hole, micropore or ultramicropore.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102897797B (en) * | 2012-04-27 | 2015-10-07 | 李宽义 | Coal-seam gas is utilized to produce the environment-friendly clean process method of prussic acid derivative |
| CN104100366B (en) * | 2014-06-09 | 2016-04-27 | 西安交通大学 | The System and method for that a kind of low concentration coal-bed gas is purified, generate electricity and compress/liquefy |
| CN105038884B (en) * | 2015-07-13 | 2017-12-12 | 中煤科工集团重庆研究院有限公司 | The separation method of low concentration coalbed methane containing oxygen concentrate methane |
| EP3255126A1 (en) * | 2016-06-09 | 2017-12-13 | Linde Aktiengesellschaft | Method of processing a coal seam gas |
| EP3255127A1 (en) * | 2016-06-09 | 2017-12-13 | Linde Aktiengesellschaft | Method of processing a coal seam gas |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4238204A (en) * | 1979-06-18 | 1980-12-09 | Monsanto Company | Selective adsorption process |
| CN85103557A (en) * | 1985-04-29 | 1986-10-29 | 化学工业部西南化工研究院 | Methane in the pressure swing adsorption method enrichment coal mine mash gas |
| JPS62109890A (en) * | 1985-11-06 | 1987-05-21 | Toho Gas Co Ltd | Production of fuel gas |
| CN1042312A (en) * | 1987-10-22 | 1990-05-23 | 联合碳化公司 | Integrated pressure swing adsorption/membrane separation |
-
2005
- 2005-11-03 CN CNB200510047624XA patent/CN100358609C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4238204A (en) * | 1979-06-18 | 1980-12-09 | Monsanto Company | Selective adsorption process |
| CN85103557A (en) * | 1985-04-29 | 1986-10-29 | 化学工业部西南化工研究院 | Methane in the pressure swing adsorption method enrichment coal mine mash gas |
| JPS62109890A (en) * | 1985-11-06 | 1987-05-21 | Toho Gas Co Ltd | Production of fuel gas |
| CN1042312A (en) * | 1987-10-22 | 1990-05-23 | 联合碳化公司 | Integrated pressure swing adsorption/membrane separation |
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