CN102389685A - Coal mine methane gas enriching method comprising step of pumping at exhaust end of adsorption tower - Google Patents
Coal mine methane gas enriching method comprising step of pumping at exhaust end of adsorption tower Download PDFInfo
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- CN102389685A CN102389685A CN2011103057281A CN201110305728A CN102389685A CN 102389685 A CN102389685 A CN 102389685A CN 2011103057281 A CN2011103057281 A CN 2011103057281A CN 201110305728 A CN201110305728 A CN 201110305728A CN 102389685 A CN102389685 A CN 102389685A
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Abstract
The invention provides a method for promoting a concentration of a coal mine methane gas which is subjected to vacuum pressure-swing adsorption and enrichment. According to the method, a vacuumizing process is used for acquiring a gas product from a desorption stage. In order to promote a volume fraction of the methane gas in the gas product, the gas is pumped from an exhaust end of an adsorption tower in a vacuumizing initial stage and the pumped gas is returned to a feed gas. An adsorbent which has a function of selectively absorbing the methane is taken as the adsorbent used in the adsorption tower. An activated carbon, a zeolite molecular sieve or a MOF (metal organic framework) can be taken as the adsorbent. According to the method, an absorption pressure is controlled within 0.16MPa, thereby being capable of enriching the methane in the coal mine methane gas with lower energy consumption, utilizing the methane gas in the coal mine methane gas and reducing emission of greenhouse gas. The method can be used for enriching and concentrating other high-absorption component gases rich in methane, carbon dioxide, carbon monoxide, and the like.
Description
Technical field
[0001] the invention belongs to transformation adsorbed gas separation field, relate to a kind of method of Vacuum Pressure Swing Adsorption enrichment coal mine wind-lack gas, can be used for the enrichment of strong absorbed component gas such as methane, carbon dioxide.
Background technology
There is 18,000,000,000 m every year in China
3Above pure methane is sneaked into and is passed through weary wind emptying in the mine air, and this is equivalent to more than 3,600 ten thousand tons of coals and is wasted.Moreover, methane is to be only second to CO
2Second largest greenhouse gases, discharge of methane has become the great environmental problem that the whole world faces jointly to the destruction of atmospheric environment.China is a coal big country; 2000m is 36 tcms with interior coal bed gas reserves according to statistics, accounts for 12.5% of whole world coal bed gas reserves, occupies the third place in the world; But annual methane gas because of the discharging of mining accounts for 1/3 of world's coal mining discharging coal bed gas total amount, ranks first in the world.It mainly is because concentration of methane gas is lower that a large amount of methane gas enter in the atmosphere.Mine air-lack mash gas accounts for 80%-90% in the methane gas that is discharged, and its mean concentration is about 0.25%.So the methane gas of low concentration utilizes difficulty bigger; Present ventilation air methane oxidized apparatus just can be kept steady operation after generally requiring methane concentration to be higher than 0.3%; Just can be used for generating when methane concentration surpasses 0.5% after gas oxidation unit, after 0.8%, can utilize the lean-burn gas turbine power generation.Therefore, the ventilation air gas gas of low methane concentrations is carried out enrichment, and be used and have very significant meaning.
In all gas separating methods, advantage such as pressure swing adsorption method is little with its investment, and operating cost is low is paid close attention to receiving aspect the gas separation field widely.In the adsorption separation process that reclaims heavy ends gas, generally all control the concentration of strong absorbed component gas in the discharging gas for guaranteeing the rate of recovery, certainly will cause mass-transfer zone also to rest in the adsorption tower like this, influence the concentration of product gas.General method through forward step-down shifts out adsorption tower with mass-transfer zone under the high situation of adsorptive pressure; Improve product gas concentration; Like patent CN85103557A enrichment coal mine gas gas, CN101422683A recovery CO gas etc. all adds forward depressurization step.But when adsorptive pressure is low, then can't realize forward step-down, perhaps forward the amplitude of step-down is smaller.
Utilize the flow process of having announced a kind of multistage adsorbing separation coal mine gas among patent CN101503335A, the CN101502740A, methane is adsorbed as heavy ends gas, obtains the product gas of high concentration methane through the method that vacuumizes desorb.In first order adsorption process; Methane concentration is a higher value in the control discharging gas; So then can mass-transfer zone be shifted out adsorption tower, the discharging gas of higher concentration gets into other one-level adsorption separation device to be separated, and the gas that separates the back acquisition turns back to the unstripped gas arrival end again to be separated.Though such flow process can improve concentration under the situation of higher yields, system is complicated, has also increased investment of devices simultaneously.
Summary of the invention
Improve the concentration of Device in Gas in the transformation adsorption separation process, the present invention provides a kind of adsorption separating method of adsorption tower exhaust end pump drainage.This method can improve the concentration of product gas methane.
A kind of coal mine wind-lack gas enrichment method with adsorption tower exhaust end pump drainage step is realized the enrichment of low-concentration methane gas through the method for Vacuum Pressure Swing Adsorption.Methane gas is strong absorbed component in the said vacuum pressure swing absorption process, and the product gas that is rich in methane obtains in the depressurization desorption process.The gas partial discharge that vacuumizes in the method for said raising pressure-changed adsorption concentrating coal mine wind-lack gas concentration.The adsorbent that uses in the said pressure swing adsorption method can be zeolite molecular sieve, active carbon, MOF (metal-organic framework materials) etc. for methane being had the adsorbent of selective adsorption capacity.
Said transformation adsorption separation device comprises at least 2 adsorption towers, also can be any adsorption tower more than 2 towers.The technological process of described pressure swing adsorption method mainly comprise boost, adsorb, all pressure drops, vacuumize discharging, vacuumize, equal these six steps of voltage rise.Said pressure swing adsorption technique parameter is following: adsorptive pressure is controlled within absolute pressure 0.1MPa～0.16MPa, and depressurization desorption pressure is controlled within absolute pressure 0.01MPa～0.08MPa.In the said pressure-swing absorption process, after all pressure drop finishes, vacuumize from the adsorption tower upper end earlier, the portion gas of extracting out is emitted.The relatively low gas of methane volume fraction that can avoid the desorb starting stage to flow out like this gets in the product gas, can improve the concentration of Vacuum Pressure Swing Adsorption enrichment coal mine wind-lack gas gas.
Native system is mainly by forming with the lower part: air blast-1, air inlet surge tank-2, the first air intake control valves-3A, second air intake control valve-3B; First takes out true control valve-4A, second takes out true control valve-4B, first adsorption tower-5A, second adsorption tower-5B, first discharging gas control valve-6A, the second discharging gas control valve 6B; First Pressure and Control valve-7A, second Pressure and Control valve-7B; The first pump drainage control valve-8, the second pump drainage control valve-13, the 3rd pump drainage control valve-14, check valve-9, discharging gas surge tank-10; Exhaust jet stream adjustable valve-11, vavuum pump-12.Air blast-1 through air inlet surge tank-2 through first air intake control valve-3A and second air intake control valve-3B respectively with first adsorption tower-5A and second adsorption tower-5B lower ends; First adsorption tower-5A takes out true control valve-4A through first and links to each other with vavuum pump-12, and second adsorption tower-5B takes out true control valve-4B through second and links to each other with vavuum pump-12.First adsorption tower-5A, the first pump drainage control valve, 8 one ends link to each other with the first Pressure and Control valve 7A, the second Pressure and Control valve 7B, and the other end links to each other with vavuum pump, realize the step that vacuumizes of adsorption tower exhaust end.The second pump drainage control valve 13 connects vavuum pump exhaust end and blower inlet end, is used for reclaiming the methane gas of pump drainage gas, and the 3rd pump drainage control valve 14 1 ends link to each other with vavuum pump, and the other end is as the output of product gas; The first discharging gas control valve 6A links to each other with second adsorption tower-5B upper end with first adsorption tower-5A respectively with the second discharging gas control valve 6B, one end, and the other end links to each other with discharging gas surge tank-10, exhaust jet stream adjustable valve-11 through check valve-9.
The invention has the beneficial effects as follows:
1) can improve the volume fraction of product gas methane in the Vacuum Pressure Swing Adsorption enrichment coal mine wind-lack gas;
2) through a certain gas in the method enrichment mist of transformation absorption, its initial cost is low, and operating cost is low, flexible and convenient operation;
3) the present invention can make the ventilation air gas gas of low concentration be fully utilized, and reduces the pollution of methane gas discharging to environment, has great economy and Significance for Environment.
4) the present invention also can also be used to reclaim the gas that other contain strong absorbed component such as methane, carbon dioxide, carbon monoxide.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is a process chart of the present invention;
Be labeled as among the figure: air blast-1, air inlet surge tank-2, the first air intake control valves-3A, second air intake control valve-3B; First takes out true control valve-4A, second takes out true control valve-4B, first adsorption tower-5A, second adsorption tower-5B, first discharging gas control valve-6A, second discharging gas control valve-6B; First Pressure and Control valve-7A, second Pressure and Control valve-7B; The first pump drainage control valve-8, the second pump drainage control valve-13, the 3rd pump drainage control valve-14, check valve-9, discharging gas surge tank-10; Exhaust jet stream adjustable valve-11, vavuum pump-12.
The specific embodiment
Embodiment: with the methane volume fraction is that 0.2% weary general mood body is concentrated to more than 0.5%.
As shown in Figure 1; A kind of coal mine wind-lack gas enrichment method with adsorption tower exhaust end pump drainage step; Unstripped gas flows into the first adsorption tower 5A, the second adsorption tower 5B by air blast 1 pressurization through air inlet surge tank 2 and the first air intake control valve 3A, the second air intake control valve 3B.Behind the strong absorbed component methane and part nitrogen and oxygen in the adsorbents adsorb unstripped gas in the first adsorption tower 5A and the second adsorption tower 5B, the remaining gaseous mixture that contains trace methane gas is crossed check valve-9 through the first discharging gas control valve 6A, the second discharging gas control valve 6B and is flowed out through discharging gas surge tank-10, exhaust jet stream adjustable valve-11.Adsorption tower after absorption finishes is through after the equal pressure drop, and product gas is taken out true control valve 4A, second by vavuum pump 12 through first and taken out true control valve 4B, from the first adsorption tower 5A, the second adsorption tower 5B, extracts out.Pressure equalizing is realized through the first Pressure and Control valve 7A, the second Pressure and Control valve 7B.The first pump drainage control valve, 8 one ends link to each other with the first Pressure and Control valve 7A, the second Pressure and Control valve 7B, and the other end links to each other with vavuum pump, realize the step that vacuumizes of adsorption tower exhaust end.The second pump drainage control valve 13 connects vavuum pump exhaust end and blower inlet end.Its circulation sequential is as shown in table 1, is that example describes separation process with the first adsorption tower 5A below.
(1) unstripped gas gets into the first adsorption tower 5A through air blast 1 pressurization through the air inlet surge tank 2 and the first air intake control valve 3A, accomplishes the pressurising step;
(2) pressurising finishes the back unstripped gas and continues to get into the first adsorption tower 5A, and this moment, the first gas exhausting valve 6A opened, and gas methane in flow process is adsorbed, and the gas that contains low methane volume fraction that is not adsorbed is discharged through the first gas exhausting valve 6A;
(3) after methane penetrates, close the first gas exhausting valve 6A from the first adsorption tower 5A, open the first Pressure and Control valve 7A and the second Pressure and Control valve 7B all presses adsorption tower, this moment, the first adsorption tower 5A internal pressure reduced, and the second adsorption tower 5B pressure raises;
(4) completion is closed the second Pressure and Control valve 7B and the first air intake control valve 3A after all pressing; Opening 8 couples first adsorption tower 5A of the first pump drainage control valve vacuumizes; The gases methane volume fraction that extract out this moment is relatively low, and this part gas returns in the unstripped gas through the second pump drainage control valve 13;
(5) close the first pump drainage control valve 8 after pump drainage finishes and open first with the second pump drainage control valve 13 and take out true control valve 4A and the 3rd pump drainage control valve 14, this moment, the gas of extraction was the product gas that contains higher methane volume fraction;
(6) vacuumize end after, close first and take out true control valve 4A, open the first Pressure and Control valve 7A and the second Pressure and Control valve 7B, the first adsorption tower 5A is carried out equal voltage rise;
(7) repeating step (1)-(6).
So then accomplished a circulation.
Table 1 circulation time-scale
The methane volume fraction of ventilation air gas gas is 0.2% in this embodiment.The adsorbent that loads in this embodiment is a cocoanut active charcoal.Technological parameter is following in this embodiment: unstripped gas adsorptive pressure after air blast boosts is up to 150kPa (absolute pressure), minimum parsing pressure 20 kPa (absolute pressure).In the present embodiment in the product gas volume fraction of methane greater than 0.5%.
Claims (3)
1.
A kind ofThe coal mine wind-lack gas enrichment method that attaches tower exhaust end pump drainage step is characterized in that realizing through the method for Vacuum Pressure Swing Adsorption the enrichment of low-concentration methane gas, and in adsorption process, introduces the processing step that vacuumizes discharging; Methane gas is strong absorbed component in the said vacuum pressure swing absorption process, and the product gas that is rich in methane obtains in the depressurization desorption process, the gas partial discharge that vacuumizes in the Vacuum Pressure Swing Adsorption; The adsorbent that uses in the said vacuum pressure swing absorption process is included as zeolite molecular sieve, active carbon, metal-organic framework materials for methane being had the adsorbent of selective adsorption capacity;
Wherein the transformation adsorption separation device comprises at least 2 adsorption towers, or is the above any adsorption towers of 2 towers; The technological process of vacuum pressure swing adsorption process mainly comprise boost, adsorb, all pressure drops, vacuumize discharging, vacuumize, equal these six steps of voltage rise; Said change vacuum pressure absorbing process parameter is following: adsorptive pressure is controlled within absolute pressure 0.1MPa～0.16MPa, and depressurization desorption pressure is controlled within absolute pressure 0.01MPa～0.08MPa; The adsorption tower of accomplishing adsorption process utilizes vavuum pump to bleed from the adsorption tower exhaust end earlier after equal pressure drop terminal procedure, and this portion gas does not get in the product gas.
2. a kind of coal mine wind-lack gas enrichment method as claimed in claim 1 with adsorption tower exhaust end pump drainage step, the enriching apparatus that it is characterized in that adopting is by forming with the lower part: air blast-(1), air inlet surge tank-(2), first air intake control valve-(3A), second air intake control valve-(3B), first are taken out true control valve-(4A), second and are taken out true control valve-(4B), first adsorption tower-(5A), second adsorption tower-(5B), the first discharging gas control valve-(6A), the second discharging gas control valve-(6B), the first Pressure and Control valve-(7A), the second Pressure and Control valve-(7B), the first pump drainage control valve-(8), the second pump drainage control valve-(13), the 3rd pump drainage control valve-(14), check valve-(9), discharging gas surge tank-(10), exhaust jet stream adjustable valve-(11), vavuum pump-(12); Air blast-(1) through air inlet surge tank-(2) through first air intake control valve-(3A) and second air intake control valve-(3B) respectively with the lower ends of first adsorption tower-(5A) and second adsorption tower-(5B); First adsorption tower-(5A) is taken out true control valve-(4A) link to each other with vavuum pump-(12) through first, and second adsorption tower-(5B) is taken out true control valve-(4B) link to each other with vavuum pump-(12) through second; First adsorption tower-(5A), the first pump drainage control valve-(a 8) end and the first Pressure and Control valve-(7A), the second Pressure and Control valve-(7B) link to each other, the other end links to each other with vavuum pump (12), realizes the step that vacuumizes of adsorption tower exhaust end; The second pump drainage control valve (13) connects vavuum pump exhaust end and blower inlet end; The 3rd pump drainage control valve-(a 14) end links to each other with vavuum pump, and the other end is as the output of product gas; The end of the first discharging gas control valve-(6A) and the second discharging gas control valve-(6B) links to each other respectively with on first adsorption tower-(5A) and second adsorption tower-(5B), the other end through check valve-(9) with discharge gas surge tank-(10), exhaust jet stream adjustable valve-(11) link to each other.
3. a kind of coal mine wind-lack gas enrichment method with adsorption tower exhaust end pump drainage step according to claim 1 and 2 is characterized in that: said coal mine wind-lack gas methane volume fraction is 0.2%; Said adsorbent adopts cocoanut active charcoal; Said adsorptive pressure is up to 150kPa, and said depressurization desorption pressure is minimum to be 20kPa; The product gas methane volume fraction that obtains at last is greater than 0.5%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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) |
| CN108031240A (en) * | 2017-12-18 | 2018-05-15 | 洛阳健阳科技有限公司 | A kind of device based on HEU type zeolite molecular sieve separation of methane and nitrogen |
| CN108096995A (en) * | 2017-12-18 | 2018-06-01 | 洛阳健阳科技有限公司 | A kind of method based on new HEU types zeolite molecular sieve separation of methane and nitrogen |
| CN111773882A (en) * | 2020-07-28 | 2020-10-16 | 中国矿业大学 | Micro-positive pressure vacuum pressure swing adsorption system and method for safely concentrating low-concentration gas |
| CN113797704A (en) * | 2021-10-20 | 2021-12-17 | 中国矿业大学 | Safe and efficient step purification method and system for preparing natural gas from low-concentration gas |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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) |
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| CN108096995A (en) * | 2017-12-18 | 2018-06-01 | 洛阳健阳科技有限公司 | A kind of method based on new HEU types zeolite molecular sieve separation of methane and nitrogen |
| CN111773882A (en) * | 2020-07-28 | 2020-10-16 | 中国矿业大学 | Micro-positive pressure vacuum pressure swing adsorption system and method for safely concentrating low-concentration gas |
| CN111773882B (en) * | 2020-07-28 | 2021-08-20 | 中国矿业大学 | Micro-positive pressure vacuum pressure swing adsorption system and method for safely concentrating low-concentration gas |
| CN113797704A (en) * | 2021-10-20 | 2021-12-17 | 中国矿业大学 | Safe and efficient step purification method and system for preparing natural gas from low-concentration gas |
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