CN101096606A - Coal mine mash gas low-pressure concentration method - Google Patents
Coal mine mash gas low-pressure concentration method Download PDFInfo
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- CN101096606A CN101096606A CNA2006100281763A CN200610028176A CN101096606A CN 101096606 A CN101096606 A CN 101096606A CN A2006100281763 A CNA2006100281763 A CN A2006100281763A CN 200610028176 A CN200610028176 A CN 200610028176A CN 101096606 A CN101096606 A CN 101096606A
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Abstract
The invention discloses a safe low-pressure extracting method of coal mine gas, which comprises the following steps: adopting 2-5 adsorbing towers to load 2-3 high-effective CH4 gas adsorbents to adsorb CH4 from coal mine gas with pressure less than 0.05MPa. G; passing the saturated CH4 into one voltage equalizing course to improve the density of gas; extracting the adsorbed CH4 from adsorbent through vacuum extracting pattern; obtaining high-density CH4 product with density over 60%.
Description
Technical field
What the present invention relates to is under low pressure a kind of, and the low concentration gas gas that can't use is put forward the technology that dense one-tenth is convenient to reclaim the high concentration gas of use.
Background technology
At present, in disclosed at home and abroad patent documentation or the report data, still do not have any technology and can under low pressure CH4 concentration be lower than 30% lower concentration coal mine mash gas and carry dense safely to more than 30%.
And the present coal mine associated coal mine gas of China has and all belongs to concentration more than 35% and be lower than 30% low concentration gas, and this part coal mine gas is because CH
4Gas concentration is low, and the oxygen level height is in close proximity to CH
4The explosion ratio scope of gas or just at CH
4In the explosion ratio scope of gas, therefore be difficult to direct utilization.China is as big coal country, gas resources is very abundant, 2000 meters degree of depth are contained the gas amount that 35 tcms are arranged in the above coal seam, natural gas source amount basic and China is suitable, is equivalent to 42,000,000,000 tons of mark coals, at present more than annual firedamp drainage 190 billion cubic meters of China, wherein gas drainage amount is about 15 billion cubic meters, the low concentration gas amount of pump drainage surpasses 5 billion cubic meters, and this has not only caused the waste of a large amount of energy, and because CH
4Gas is a kind of strong greenhouse gas, therefore also causes serious environmental issue.
So press for a kind of technology that can safely low concentration gas gas be carried dense one-tenth high concentration gas, in a single day the concentration of coal mine gas carried dense to just being used for methane electrical generation efficiently more than 30%.
Summary of the invention
A kind of coal mine mash gas low-pressure concentration method is characterized in that, the extracting and concentrating technology process for absorption, drop pressure, vacuumize; Adopt 2～5 adsorption towers, adorn 2～3 kinds of CH efficiently in the adsorption tower
4The gas sorbent material;
A. adsorption process
From the coal mine gas of coal-mine gas extracting device, temperature is a normal temperature, and pressure directly under low pressure enters in the adsorption tower of low pressure gas concentration unit multiple therein CH less than 0.05MPa.G
4Under the selection absorption of gas sorbent material, the H in the coal mine gas
20 and CH
4Be adsorbed agent and absorb etc. component, the constituent of air that is not adsorbed then flows out from cat head, the CH in the emptying gas
4Gas content is less than 5%;
As the CH that is adsorbed
4When gas mass transfer zone forward position arrives the bed outlet, stop absorption;
B. drop pressure process
After adsorption process finishes, along the CH of absorption direction with the elevated pressures in the tower
4Gas is put into other and has been finished regenerated lower pressure adsorption tower;
C. vacuum
After pressure equalizing finishes, will be adsorbed the CH of agent absorption against the absorption direction
4Gas is released, the products C H that releases
4Send the product surge tank, products C H
4The maximum concentration of gas can reach 60%.
Technological core of the present invention is: be lower than under the 0.05MPa.G pressure, just utilizing the natural outlet pressure of coal-mine gas extracting device to carry out CH
4The purification of gas does not need the coal mine gas supercharging equipment, therefore the potential safety hazard of just having avoided coal mine gas to boost and brought.In the present invention, utilize efficient CH
4Sorbent material is the CH in the adsorption gas gas under low pressure
4Gas is at last by vacuumizing the CH that has obtained having carried dense in adsorption tower
4The gas product.
Description of drawings
Accompanying drawing 1 is the schema that the present invention uses on 2 adsorption towers;
Accompanying drawing 2 is schemas that the present invention uses on 3 adsorption towers;
Accompanying drawing 3 is schemas that the present invention uses on 4 adsorption towers;
Accompanying drawing 4 is schemas that the present invention uses on 5 adsorption towers.
Adsorption tower A, adsorption tower B, adsorption tower C, adsorption tower D, adsorption tower E, intermediate buffering jar V01, vacuum buffer tank V02, vacuum pump P01.
Adsorption tower A has 1A, 2A, 3A, 4A valve.
Adsorption tower B has 1B, 2B, 3B, 4B valve.
Adsorption tower C has 1C, 2C, 3C, 4C valve.
Adsorption tower D has 1D, 2D, 3D, 4D valve.
Adsorption tower E has 1E, 2E, 3E, 4E valve.
Specific embodiment
See accompanying drawing 1～4.
Equipment of the present invention is filled with CH by 2～5
4The adsorption tower of gas sorbent material, 1～2 surge tank, vacuum pump and some sequencing valves that is used for switching controls are formed.Concrete technological process by absorption, drop pressure, vacuumize, a boost pressure and step such as finally boost form.Sorbent material in the described adsorption tower is silica type, activated carbon class or molecular sieve sorbent material.
A. adsorption process
From the coal mine gas of coal-mine gas extracting device (being generally water-ring vacuum pump), temperature is a normal temperature, and pressure directly under low pressure enters the adsorption tower A interior (is that example is described with adsorption tower A) of low pressure gas concentration unit less than 0.05MPa.G.Coal mine gas at first enters adsorption tower A through sequencing valve 1A, multiple therein CH
4Under the selection absorption of gas sorbent material, the H in the coal mine gas
2O and CH
4Be adsorbed agent and absorb etc. component, the constituent of air that is not adsorbed then flows out from adsorption tower A top, directly high some emptying after sequencing valve 2A and pressure regulator valve PV01 voltage stabilizing.CH in the emptying gas
4Gas content is less than 5%.
As the CH that is adsorbed
4When gas mass transfer zone forward position (being called absorb leading-edge) arrives the bed outlet, turn off the intake valve and the outlet valve of this adsorption tower, stop absorption.
B. drop pressure process
This is after adsorption process finishes, open the 3A valve and finished No. 3 valves (3B or 3C or 3D or 3E) of the low pressure adsorption tower that vacuumizes regenerative process with other, adsorption tower A that is in elevated pressures and the adsorption tower that is in vacuum pressure condition are connected, thereby naturally with the CH in the high pressure adsorption tower
4Gas is put into other and has been finished regenerated lower pressure adsorption tower, realizes the step-down process of high pressure adsorption tower, reaches simultaneously to reclaim bed dead space CH
4The purpose of gas.Sometimes in order to make adsorption process more continuous, also can open 3A valve and KV5 valve earlier, with the CH in the high pressure adsorption tower
4Gas reclaims intermediate buffering jar V01 earlier, and then opens the KV5 valve of intermediate buffering jar and No. 3 valves (3B or 3C or 3D or 3E) of low pressure adsorption tower, with the CH that reclaims in the intermediate buffering jar V01
4Gas reclaims into low pressure adsorption tower.
Intermediate buffering jar V01 effect in this course is: use as the transfer hold-up vessel that all pushes back getter, no matter have or not this intermediate buffering jar all not influence the substantial process process of this patent in concrete flow scheme design.
C. vacuum
This is behind the drop pressure end of processing, opens the 4A valve, will be adsorbed the CH of agent absorption against the absorption direction
4The process of releasing.The products C H that releases
4Gas is directly sent the battery limit (BL) and is removed products C H
4The storage tank of gas or directly use, products C H
4The maximum concentration of gas can reach 60%.
Vacuum pump P01 is by alternately extracting CH out from each adsorption tower
4Gas obtains successive CH
4The gas product; For the adsorption tower comparatively small amt, so that the discontinuous situation of the vacuum of each adsorption tower, in the device vacuum buffer tank V02 can be set, the vacuum rest periods when being in vacuum without any adsorption tower, can open KV6, vacuumize surge tank, thereby make products C H with vacuum pump
4Gas is more continuous.
Vacuum buffer tank V02 effect in this course is: use as the vacuum buffer between the adsorption tower vacuum rest periods, no matter have or not this vacuum buffer tank all not influence the substantial process process of this patent in concrete flow scheme design.
D. boost pressure process
After the vacuum regeneration process is finished, open the 3A valve once more and just finished No. 3 valves (3B or 3C or 3D or 3E) of the high pressure adsorption tower of adsorption process, use elevated pressures CH from other adsorption tower with other
4Gas boosts to this adsorption tower, and this process is corresponding with the drop pressure process, is not only the process of boosting, and reclaims the bed dead space CH of other tower especially
4The process of gas.
If be provided with intermediate buffering jar V01 in the flow process, then be to open 3A and KV5 valve simultaneously this moment, with what store in the intermediate buffering jar V01, from the CH of other adsorption tower drop pressure process recovery
4Gas carries out boost pressure to adsorption tower A.
E. the process of finally boosting
After the boost pressure process is finished, in order adsorption tower can be switched to reposefully adsorb and to guarantee that product purity does not fluctuate in this course next time, open the 2A valve, with discharging gas adsorption column pressure is risen to adsorptive pressure.
Adsorption tower A has just finished complete " adsorption-regeneration " circulation after this process, gets ready for absorption next time again.
The above operation that hockets of 2-5 adsorption tower can obtain successive high density CH
4The gas product.The working process of all adsorption towers and above be that the process described of example is identical with the A tower.
The present invention can be applied to flow processs such as 2 towers, 3 towers, 4 towers, 5 towers in actual applications.During various flow operations, the specific embodiment of each adsorption tower is all the same as mentioned above, and the flow process of different tower numbers is varying in size of processing power.
Claims (4)
1, a kind of coal mine mash gas low-pressure concentration method is characterized in that, the extracting and concentrating technology process for absorption, drop pressure, vacuumize; Adopt 2～5 adsorption towers, in adorn 2～3 kinds of CH efficiently
4The gas sorbent material;
A. adsorption process
From the coal mine gas of coal-mine gas extracting device, temperature is a normal temperature, and pressure directly under low pressure enters in the adsorption tower of low pressure gas concentration unit multiple therein CH less than 0.05MPa.G
4Under the selection absorption of gas sorbent material, the H in the coal mine gas
2O and CH
4Components such as gas are adsorbed agent and absorb, and the constituent of air that is not adsorbed then flows out from cat head, the CH in the emptying gas
4Gas content is less than 5%;
As the CH that is adsorbed
4When gas mass transfer zone forward position arrives the bed outlet, stop absorption;
B. drop pressure process
After adsorption process finishes, along the CH of absorption direction with the elevated pressures in the tower
4Gas is put into other and has been finished regenerated lower pressure adsorption tower;
C. vacuum
After pressure equalizing finishes, will be adsorbed the CH of agent absorption against the absorption direction
4Gas is released, the products C H that releases
4Pneumatic transmission product surge tank, products C H
4The maximum concentration of gas can reach 60%.
2, according to the described a kind of coal mine mash gas low-pressure concentration method of claim 1, it is characterized in that, also have
D. boost pressure process
After vacuum is finished, use elevated pressures CH from other adsorption tower
4Gas boosts to this adsorption tower;
E. the process of finally boosting
After the boost pressure process is finished, adsorption column pressure is risen to adsorptive pressure with discharging gas;
Adsorption tower has just been finished complete " adsorption-regeneration " circulation after this process, gets ready for absorption next time again;
The above operation that hockets of 2-5 adsorption tower can obtain successive high density CH
4The gas product.
According to claim 1 or 2 described a kind of coal mine mash gas low-pressure concentration methods, it is characterized in that 3, the sorbent material in the described adsorption tower is silica type, activated carbon class or molecular sieve sorbent material.
4, according to the described a kind of coal mine mash gas low-pressure concentration method of claim 3, it is characterized in that concrete CH
4Gas extracting and concentrating technology process by absorption, drop pressure, vacuumize, a boost pressure and step such as finally boost form:
A. absorption
Temperature is a normal temperature, and pressure is less than the coal mine gas of 0.05MPa.G, directly under low pressure in inlet valve 1A enters adsorption tower A, at CH
4Under the selection absorption of gas sorbent material, the H in the coal mine gas
2O and CH
4Being adsorbed agent etc. component absorbs; As the CH that is adsorbed
4When gas mass transfer zone forward position arrives the bed outlet, turn off the intake valve and the outlet valve of this adsorption tower, stop absorption;
B. drop pressure
After adsorption process finishes, with the CH in the high pressure adsorption tower
4Reclaim intermediate buffering jar V01 earlier, and then open the KV5 valve of intermediate buffering jar and No. 3 valves of low pressure adsorption tower, with the CH that reclaims in the intermediate buffering jar V01
4Reclaim the low pressure adsorption tower; The constituent of air that is not adsorbed then flows out from adsorption tower A top;
C. vacuumize
Behind the drop pressure end of processing, open inlet valve 4A, by will be adsorbed the CH of agent absorption against the absorption direction to adsorption tower with vacuum pump P01
4Carry out vacuum pumping and obtain the CH of high density
4The gas product, products C H
4The maximum concentration of gas can reach 60%; For the adsorption tower comparatively small amt, so that the discontinuous situation of the vacuum of each adsorption tower, in the device vacuum buffer tank V02 can be set, the vacuum rest periods when being in vacuum without any adsorption tower, can open valve KV6, vacuumize surge tank, thereby make products C H with vacuum pump
4Gas is more continuous;
D. boost pressure
Vacuumizing after regenerative process finishes, opening outlet valve A3 once more and other has just finished No. 3 valves of outlet valve of the high pressure adsorption tower of adsorption process, using elevated pressures CH from other adsorption tower
4Gas boosts to this adsorption tower; If be provided with intermediate buffering jar V01 in the flow process, then be to open 3A and KV5 valve simultaneously this moment, with what store in the intermediate buffering jar V01, from the CH of other adsorption tower drop pressure process recovery
4Gas carries out boost pressure to adsorption tower A;
E. finally boost
After the boost pressure process is finished, open outlet valve 2A, with discharging gas adsorption column pressure is risen to adsorptive pressure;
As adopt two above adsorption towers, during various flow operations, the specific embodiment of each adsorption tower is all as mentioned above.
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|---|---|---|---|
| CN2006100281763A CN101096606B (en) | 2006-06-27 | 2006-06-27 | Coal mine mash gas low-pressure concentration method |
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|---|---|---|---|
| CN2006100281763A CN101096606B (en) | 2006-06-27 | 2006-06-27 | Coal mine mash gas low-pressure concentration method |
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| CN101096606B CN101096606B (en) | 2011-06-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103031170A (en) * | 2012-12-14 | 2013-04-10 | 贵州盘江煤层气开发利用有限责任公司 | Production method for concentrating low-concentration gas to prepare LNG (liquefied natural gas) |
| CN111928119A (en) * | 2020-08-06 | 2020-11-13 | 欧科能源技术(天津)有限公司 | Mine gas safety mixing system and gas mixing ratio control method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85103557B (en) * | 1985-04-29 | 1987-10-28 | 化学工业部西南化工研究院 | Methane in the pressure swing adsorption method enrichment coal mine mash gas |
| CN100478317C (en) * | 2004-07-09 | 2009-04-15 | 西南化工研究设计院 | Technology of low temperature separation and concentration coal layer gas to produce methane |
-
2006
- 2006-06-27 CN CN2006100281763A patent/CN101096606B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103031170A (en) * | 2012-12-14 | 2013-04-10 | 贵州盘江煤层气开发利用有限责任公司 | Production method for concentrating low-concentration gas to prepare LNG (liquefied natural gas) |
| CN111928119A (en) * | 2020-08-06 | 2020-11-13 | 欧科能源技术(天津)有限公司 | Mine gas safety mixing system and gas mixing ratio control method |
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| CN101096606B (en) | 2011-06-15 |
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Owner name: SHANGHAI HANXING ENERGY TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SHANGHAI BIAOQING GAS TECHNOLOGY CO., LTD. Effective date: 20110907 |
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Free format text: CORRECT: ADDRESS; FROM: 201315 NANHUI, SHANGHAI TO: 201204 PUDONG NEW AREA, SHANGHAI |
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Effective date of registration: 20110907 Address after: Pudong Peony Road 201204 Shanghai City Dongchen No. 60 building room 1406 Patentee after: Shanghai Hanxing Energy Technology Co., Ltd. Address before: 201315 Shanghai city Nanhui District Cambridge Zhenkang Shi Road No. 17 room 183 Patentee before: Shanghai Gas with Hydrogen Technology Co., Ltd. |
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Inventor after: Yin Dongmei Inventor before: Ao Yuan |
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Free format text: CORRECT: INVENTOR; FROM: AO YUAN TO: YIN DONGMEI |
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| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20080102 Assignee: Guizhou Pan Jiang cbm development utilizes Co., Ltd Assignor: Shanghai Hanxing Energy Technology Co., Ltd. Contract record no.: 2013520000001 Denomination of invention: Coal mine mash gas low-pressure concentration method Granted publication date: 20110615 License type: Common License Record date: 20130318 |
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