CN103205297A - Method for separating and purifying coal mine methane (CMM) in mine areas by using pressure swing adsorption (PSA) process - Google Patents
Method for separating and purifying coal mine methane (CMM) in mine areas by using pressure swing adsorption (PSA) process Download PDFInfo
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- CN103205297A CN103205297A CN2013101288609A CN201310128860A CN103205297A CN 103205297 A CN103205297 A CN 103205297A CN 2013101288609 A CN2013101288609 A CN 2013101288609A CN 201310128860 A CN201310128860 A CN 201310128860A CN 103205297 A CN103205297 A CN 103205297A
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Abstract
The invention provides a method for separating and purifying coal mine methane (CMM) in mine areas by using a pressure swing adsorption (PSA) process. The method for separating and purifying CMM in mine areas is implemented through adding a part of nitrogen into the CMM firstly, so that the oxygen content of the CMM is controlled below 12%. In the process of adsorption, the oxygen content is always kept to be less than the maximum explosion-allowable oxygen content. The nitrogen required by the method takes gas which is not absorbed by a device for separating and purifying methane through PSA as a gas source, namely that nitrogen is prepared by using the PSA process. By using the method, a methane gas with a purity of 90-95% can be obtained by using CMM containing 20-45% of methane.
Description
Technical field
The present invention relates to the gas delivery field in the chemical field, be specially a kind of method of utilizing transformation absorption (PSA) method to separate methane in the purification mine district coal-seam gas.
Background technology
Mine district coal-seam gas (CMM) is the gas that contains methane, usually methane content 30%～45%.But, still have a large amount of methane contents to be lower than 30% coal-seam gas.Generally can be directly as domestic fuel and generating, if will must bring up to methane concentration more than 90% as Application in Chemical Engineering or compressed natural gas (CNG).Because the domestic fuel usage quantity is limited, many coal-seam gas fail well to be utilized.Not only cause the ample resources waste, also cause environmental pollution, increased the weight of Greenhouse effect.
Southwest Chemical Research and Design Institute has been invented the technology (patent No. CN 85103557185103557B) of " with methane in the pressure swing adsorption process enrichment mine district coal mine gas ", and this method technology is simple, and maintenance cost is lower.But there is potential safety hazard in the enforcement of this method, will pass the limits of explosion of methane in the compression process.In adsorption process, along with methane is adsorbed the limits of explosion 5%～15% that also will pass methane, therefore do not set up industrialized unit so far equally.
Combustion explosion not only needs the existence of combustible gas and oxygen, also needs an essential condition: combustible gas and oxygen proper proportion.The maximum allowable oxygen content refers to make the inflammable gas of a certain concentration or the critical maximum oxygen concentration that liquid vapour is not just blasted when giving enough ignition energies, (ten thousand one-tenth slightly with inexplosive stagnation point in i.e. blast, Wang Li, " discussion of inflammable gas oxygen level danger threshold "; The safe and scientific journal of China, 1999,9(1) 3).If oxygen level is higher than this concentration, burning or blast just can take place.In other words, oxygen level be lower than this concentration just can not take place the burning or the blast (Zhang Zengliang, Cai Kangxu; " limits of explosion of inflammable gas (liquid vapour) and the maximum comparative study that allows oxygen level "; The safe and scientific journal of China, 2005,12(15)).Therefore in coal-seam gas, add a certain amount of rare gas element, to reduce its oxygen concn, make its oxygen concn control under the maximum allowable oxygen content, namely control outside explosive range.
The present invention adds nitrogen in coal-seam gas, the oxygen concn in the control coal-seam gas makes it in compression process and adsorption process, and oxygen concn is all less than the maximum allowable oxygen content.(chemical fertilizer department of former Ministry of Chemical Industry is presided over according to " chemical fertilizer safety technique handbook ", the chemical combined company in Wu river rising in Ningxia and flowing into central Shaanxi, Nanjing Chemical Industry Company compiles, nineteen eighty-three first version) Fig. 1 .1-12, the CH4 that the limits of explosion of hydrogen, carbon monoxide, methane and nitrogen, carbon dioxide mix gas (in the air) provides-N2 system explosive range, its stagnation point are oxygen level 12.3%.Oxygen level is below 12% among the control CMM, and its oxygen level is less than the maximum allowable oxygen content, namely outside explosive range.In fact, can select the different nitrogen amounts that adds according to the coal-seam gas of methane different concns, generally be advisable with 8%～12% oxygen concn.Improved the security of device so greatly.And produce not adsorbed gas that nitrogen can utilize pressure-changed adsorption concentrating methane device as source of the gas, disposing a making nitrogen by pressure swing adsorption device can obtain.
Compared with the prior art the art of this patent is the security that has improved the device operation, makes pressure swing adsorption separate in the purification coal-seam gas methane and is implemented.And the nitrogen raw material is its not adsorbed gas, saves pressure process.
Summary of the invention
The present invention just is being based on above technical problem, provides the safe pressure swing adsorption process that utilizes to separate the method for methane in the purification mine district coal-seam gas.
Technical scheme of the present invention is:
A kind of method of utilizing pressure swing adsorption process to separate methane in the purification mine district coal-seam gas, in this method in the original coal-seam gas the shared volumn concentration of methane only be 30%～45%, in coal-seam gas, add a certain amount of nitrogen then, make that oxygen level remains on below 12% in the coal-seam gas, be pressurized to 0.4 MPa～0.7MPa(G) then, adopt the method for transformation absorption again, remove nitrogen and oxygen in the coal-seam gas.Obtain product gas with vacuum pumping method mutually from absorption.
The shared volumn concentration of methane is 90%～95% in the product gas.Adding the nitrogen in the coal-seam gas, is to utilize the gas that adsorbs in the pressure-changed adsorption concentrating methane device as source of the gas, adopts pressure swing adsorption process to produce the nitrogen that obtains.Two-stage pressure-swing absorption apparatus concentrate methane, the first step makes volumn concentration concentrate to 40%～50% of methane, enters second stage pressure-swing absorption apparatus then, and the second stage makes volumn concentration concentrate to 90%～95% of methane.
Coal-seam gas is after preliminary compression, and from making nitrogen by pressure swing adsorption gas (PSA-N
2) nitrogen that obtains in the device mixes, and the percentage composition of its oxygen is reduced to below 12%, further is pressurized to 0.4 MPa～0.7 MPa then, enters pressure-swing absorption apparatus.Under the fractionation by adsorption effect of sorbent material, from adsorbing the product gas of methane more than 90% of finding time mutually to obtain containing.(PSA is pressure swing adsorption)
Technical scheme among the application can also for:
At first coal-seam gas is compressed through compressor earlier, be compressed to 0.15 MPa～0.18MPa, mix with nitrogen then.Mixed gas further compresses, and is compressed to 0.5 MPa～0.55 MPa, enters transformation absorption methane device one (PSA-CH processed then
4I), discharges not adsorbed gas, enter making nitrogen by pressure swing adsorption device (PSA-N
2), the output pure nitrogen gas.The methane gas that another part finds time tentatively to be concentrated through vacuum pump is sent into the methane rich gas holder.High methane gas mixes with displacement gas, enters compressor compresses to 0.65 MPa～0.7 MPa by pipeline 9, enters transformation absorption methane device two (PSA-CH processed by pipeline 10
4II).Adsorbed gas is not discharged from suitable venting, and adsorbed gas enters vacuum pump and finds time, and is divided into two strands by pipeline then, one is exported as methane product gas, another strand enters compressor and pressurizes, and sends into pressure-swing absorption apparatus as displacement gas by pipeline, discharges from pressure-swing absorption apparatus.
In arbitrary cycle of transformation absorption, each adsorption tower will experience absorption, all press, and forward decompression, displacement, reverse decompression vacuumizes, a pressurising, steps such as secondary pressurising.Technical process and multitower operation steps about pressure swing adsorption process have been done sufficient introduction in patent CN 85103557B.
Compared with prior art, beneficial effect of the present invention is:
Compared with the prior art the art of this patent is the security that has improved the complete assembly operation, makes pressure swing adsorption separate in the purification coal-seam gas methane and is implemented.And get not adsorbed gas that nitrogen can utilize pressure-changed adsorption concentrating methane device as source of the gas, and dispose a making nitrogen by pressure swing adsorption device can obtain, save pressure process.
Description of drawings
Fig. 1 is methane technology schematic flow sheet among the pressure-changed adsorption concentrating CMM among the embodiment 1 among the application;
Fig. 2 is methane technology schematic flow sheet among the pressure-changed adsorption concentrating CMM among the embodiment 2 among the application;
Fig. 3 is methane technology schematic flow sheet among the pressure-changed adsorption concentrating CMM among the embodiment 3 among the application.
Embodiment
Below in conjunction with embodiment the present invention is further described in detail, the embodiment that provides does not limit the scope of the invention, the present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Embodiment 1:
Coal-seam gas is formed (vol%): CH
445.00, O
211.55, N
243.45, tolerance 1000Nm
3Process flow diagram is seen Fig. 1.Coal-seam gas enters compressor by pipeline 1, is compressed to 0.18 MPa～0.2 MPa, by pipeline 2 output, and with 430 Nm from pipeline 13
3Nitrogen mixes.Mixed gas composition is: CH
431.5%, O
28.2%, N
260.3%, further be compressed to 0.65 MPa～0.7 MPa through pipeline 3, by pipeline 4 output, and mixes with compressed displacement gas to 0.65 MPa～0.7 MPa from pipeline 11, enter transformation through pipeline 5 and adsorb methane device (PSA-CH processed
4), adsorbed gas does not enter making nitrogen by pressure swing adsorption device (PSA-N by pipeline 12
2), obtain the nitrogen of purity 99.5%, by pipeline 13 outputs.Discharged by pipeline 14 along venting.Adsorbed gas enters vacuum pump by pipeline 6 and finds time.Draws air is discharged by pipeline 7, a part is exported by pipeline 8 as product gas, another part enters compressor as displacement gas by pipeline 9 and pressurizes, send into pressure-swing absorption apparatus displacement by pipeline 10 and finished gas along the adsorption tower sorbent material space of strideing rapid, reclaim to 0.65 MPa～0.7 MPa by pipeline 11 is compressed.This embodiment can contain product gas 436 Nm of methane 95%
3
Coal-seam gas is formed (vol%): CH
430.0, O
214.7, N
255.3, tolerance 1000Nm
3Process flow diagram is seen Fig. 2.Coal-seam gas enters compressor by pipeline 1, is compressed to 0.15 MPa～0.18MPa, by pipeline 2 output, and with 548 Nm from pipeline 19
3Nitrogen mixes.Mixed gas composition is: CH
414.9%, O
29.7%, N
270.9%, further be compressed to 0.5 MPa～0.55 MPa through pipeline 3, enter transformation absorption methane device one (PSA-CH processed by pipeline 4
4I), discharges not adsorbed gas by pipeline 18, enter making nitrogen by pressure swing adsorption device (PSA-N
2), by the nitrogen of pipeline 19 output purities 99.5%.Discharged by pipeline 5 along venting.By the methane gas that pipeline 6 finds time tentatively to be concentrated through vacuum pump, its methane content is 47.1%, sends into the methane rich gas holder by pipeline 7.High methane gas mixes with displacement gas from pipeline 15 through pipeline 8, enters compressor compresses to 0.65 MPa～0.7 MPa by pipeline 9, enters transformation absorption methane device two (PSA-CH processed by pipeline 10
4II).Adsorbed gas is not discharged by pipeline 16 with suitable venting, adsorbed gas enters vacuum pump by pipeline 11 and finds time, be divided into two strands by pipeline 12, one is exported by pipeline 17 as product gas, another strand enters compressor pressurizes by pipeline 13, send into pressure-swing absorption apparatus as displacement gas by pipeline 14, discharged from pressure-swing absorption apparatus by pipeline 15.This embodiment can contain product gas 300 Nm of methane 95%
3
Embodiment 3:
Coal-seam gas is formed (vol%): CH
425, O
215.8, N
259.2, tolerance 1000Nm
3Process flow diagram is seen Fig. 3.Coal-seam gas is through pipeline 1 and 591 Nm from pipeline 8
3Nitrogen mixes.Mixed gas composition is: CH
415.7%, O
210.1%,, N
274.2%, enter compressor by pipeline 2, be compressed to 0.4 MPa～0.5 MPa through two sections, enter transformation absorption methane device one (PSA-CH processed by pipeline 4
4I), adsorbed gas does not enter making nitrogen by pressure swing adsorption device (PSA-N by pipeline 7
2), obtain the nitrogen of purity 99.5%, by pipeline 8 outputs.Discharged by pipeline 9 along venting.Adsorbed gas enters vacuum pump by pipeline 5 and finds time, and obtains containing high methane gas 580.2 Nm of methane 42.2%
3Discharged by pipeline 6.This high methane gas (seeing that pipeline 8 is with the rear section in the process flow diagram 2) mixes with displacement gas from pipeline 15, enters compressor compresses to 0.65 MPa～0.7 MPa by pipeline 9, enters transformation absorption methane device two (PSA-CH processed by pipeline 10
4II).Adsorbed gas is not discharged by pipeline 16 with suitable venting, adsorbed gas enters vacuum pump by pipeline 11 and finds time, be divided into two strands by pipeline 12, one is exported by pipeline 17 as product gas, another strand enters compressor pressurizes by pipeline 13, send into pressure-swing absorption apparatus as displacement gas by pipeline 14, discharged from pressure-swing absorption apparatus by pipeline 15.This embodiment can contain product gas 258 Nm of methane 90%
3
Claims (5)
1. method of utilizing pressure swing adsorption process to separate methane in the purification mine district coal-seam gas, it is characterized in that: in coal-seam gas, add a certain amount of nitrogen, in volumn concentration, make that oxygen level remains on below 12% in the coal-seam gas, be pressurized to 0.4 MPa～0.7MPa then, adopt the method for transformation absorption again, remove nitrogen and oxygen in the coal-seam gas, obtain product gas with vacuum pumping method mutually from absorption.
2. the method for utilizing pressure swing adsorption process to separate methane in the purification mine district coal-seam gas according to claim 1, it is characterized in that: the shared volumn concentration of methane is 30%～45% in the described coal-seam gas.
3. the method for utilizing pressure swing adsorption process to separate methane in the purification mine district coal-seam gas according to claim 1, it is characterized in that: the nitrogen in the described adding coal-seam gas, be to utilize the gas that adsorbs in the pressure-changed adsorption concentrating methane device as source of the gas, adopt pressure swing adsorption process to produce nitrogen.
4. the method for utilizing pressure swing adsorption process to separate methane in the purification mine district coal-seam gas according to claim 1, it is characterized in that: the shared volumn concentration of methane is 90%～95% in the described product gas, adopt two-stage pressure-swing absorption apparatus concentrate methane, the first step is shared volumn concentration concentrate to 40%～50% of methane, enter second stage pressurizing device then, the second stage is carried the shared volume volumn concentration of methane and is got 90%～95%.
5. the method for utilizing pressure swing adsorption process to separate methane in the purification mine district coal-seam gas according to claim 1, it is characterized in that: adopting this method can make in coal-seam gas volumn concentration only is that 20%～30% methane carries out concentrate, earlier methane content is brought up to more than 30%, pressurization enters second stage pressure-swing absorption apparatus again, and concentrate is to more than the volumn concentration to 90% of methane.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105199798A (en) * | 2015-10-12 | 2015-12-30 | 宁波鲍斯能源装备股份有限公司 | Low-concentration coal bed gas enriching device |
| CN107164006A (en) * | 2016-03-08 | 2017-09-15 | 上海幼鲸科技发展有限公司 | Generate electricity the system and method produced with gas product for coal bed gas |
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| 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 |
| US5388643A (en) * | 1993-11-03 | 1995-02-14 | Amoco Corporation | Coalbed methane recovery using pressure swing adsorption separation |
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| CN101531561A (en) * | 2008-03-13 | 2009-09-16 | 中国科学院理化技术研究所 | Method for purifying and separating methane from oxygen-containing coal-bed gas |
| CN101555186A (en) * | 2009-05-27 | 2009-10-14 | 北京健坤伟华新能源科技有限公司 | Method for preparing methane by deeply purifying landfill gas |
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2013
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Patent Citations (9)
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| 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 |
| US5388643A (en) * | 1993-11-03 | 1995-02-14 | Amoco Corporation | Coalbed methane recovery using pressure swing adsorption separation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105199798A (en) * | 2015-10-12 | 2015-12-30 | 宁波鲍斯能源装备股份有限公司 | Low-concentration coal bed gas enriching device |
| CN107164006A (en) * | 2016-03-08 | 2017-09-15 | 上海幼鲸科技发展有限公司 | Generate electricity the system and method produced with gas product for coal bed gas |
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Application publication date: 20130717 |