CN102389685B - 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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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 PSA 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 the strong absorbed component gas such as methane, carbon dioxide.
Background technology
China has 18,000,000,000 m every year
3above pure methane is sneaked in mine air emptying by weary wind, 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, the destruction of discharge of methane to atmospheric environment, has become the great environmental problem of whole world facing.China Shi Yige coal big country, 2000m be take interior coal bed gas reserves as 36 tcms according to statistics, accounts for 12.5% of whole world coal bed gas reserves, occupies third place in the world, but the methane gas because of the discharge of mining accounts for 1/3 of world's coal mining discharge coal bed gas total amount every year, ranks first in the world.It is mainly because concentration of methane gas is lower that a large amount of methane gas enter in atmosphere.In the methane gas being discharged, mine air-lack mash gas accounts for 80%-90%, and its mean concentration is about 0.25%.So the methane gas of low concentration utilizes difficulty larger, current ventilation air methane oxidized apparatus General Requirements methane concentration just can maintain steady operation afterwards higher than 0.3%, when methane concentration surpasses 0.5% after gas oxidation unit, generating could be used for, after 0.8%, lean-burn gas turbine power generation can be utilized.Therefore, the ventilation air gas gas of low methane concentrations is carried out to enrichment, and be used and there is very great meaning.
In all gas separating methods, pressure swing adsorption method is little with its investment, and operating cost is low etc., and advantage is being paid close attention to aspect gas separation field widely.In reclaiming the adsorption separation process of heavy constituent gas, for guaranteeing the general concentration of all controlling strong absorbed component gas in discharge gas of the rate of recovery, certainly will cause like this mass-transfer zone also to rest in adsorption tower, affect the concentration of product gas.In the situation that adsorptive pressure is high, generally the method by forward step-down shifts out adsorption tower by mass-transfer zone, improve gas product concentration, as patent CN85103557A enrichment coal mine gas gas, CN101422683A recovery CO gas etc. all adds forward depressurization step.But when adsorptive pressure is lower, cannot realize forward step-down, or forward the amplitude of step-down is smaller.
In patent CN101503335A, CN101502740A, utilize the flow process of having announced a kind of multistage adsorbing separation coal mine gas, methane is adsorbed as heavy constituent gas, obtains the gas product of high concentration methane by vacuumizing the method for desorb.In first order adsorption process, controlling methane concentration in discharge gas is a higher value, so mass-transfer zone can be shifted out to adsorption tower, the discharge gas of higher concentration enters other one-level adsorption separation device and carries out separation, and the separated rear gas obtaining turns back to unstripped gas arrival end again and carries out separation.Although such flow process can improve concentration in the situation that of higher yields, system is more complicated, the investment that has also increased equipment simultaneously.
Summary of the invention
Improve the concentration of device in Gas in pressure-variable adsorption separation process, the invention provides a kind of adsorption separating method of adsorption tower exhaust end pump drainage.The method can improve the concentration of gas product methane.
With a coal mine wind-lack gas enrichment method for adsorption tower exhaust end pump drainage step, by the method for Vacuum Pressure Swing Adsorption, realize the enrichment of low-concentration methane gas.In described vacuum pressure swing absorption process, methane gas is strong absorbed component, and the gas product that is rich in methane obtains in depressurization desorption process.The gas partial discharge vacuumizing in the method for described raising pressure-changed adsorption concentrating coal mine wind-lack gas concentration.The adsorbent using in described pressure swing adsorption method, for methane being had to the adsorbent of selective adsorption capacity, can be zeolite molecular sieve, active carbon, MOF(metal-organic framework materials) etc.
Described pressure-variable adsorption separator comprises at least 2 adsorption towers, can be also any adsorption towers more than 2 towers.The technological process of described pressure swing adsorption method mainly comprise boost, adsorb, all pressure drops, vacuumize discharge, vacuumize, equal these six steps of voltage rise.Described pressure swing adsorption technique parameter is as follows: within adsorptive pressure is controlled at absolute pressure 0.1MPa～0.16MPa, within depressurization desorption pressure is controlled at absolute pressure 0.01MPa～0.08MPa.In described pressure-swing absorption process, after equal pressure drop finishes, first from adsorption tower upper end, vacuumize, the portion gas of extraction is emitted.Can avoid so the relatively low gas of methane volume fraction that the desorb starting stage flows out to enter in gas product, can improve the concentration of Vacuum Pressure Swing Adsorption enrichment coal mine wind-lack gas gas.
Native system is mainly comprised of following part: air blast-1, air inlet surge tank-2, the first air intake control valve-3A, the second air intake control valve-3B, first takes out true control valve-4A, second takes out true control valve-4B, the first adsorption tower-5A, the second adsorption tower-5B, first row venting control valve-6A, second row venting 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, discharge gas surge tank-10, exhaust jet stream adjustable valve-11, vavuum pump-12.Air blast-1 is connected with the second adsorption tower-5B lower end with the first adsorption tower-5A respectively with the second air intake control valve-3B by the first air intake control valve-3A through air inlet surge tank-2, the first adsorption tower-5A takes out true control valve-4A by first and is connected with vavuum pump-12, and the second adsorption tower-5B takes out true control valve-4B by second and is connected with vavuum pump-12.The first adsorption tower-5A, first pump drainage control valve 8 one end are connected with the first Pressure and Control valve 7A, the second Pressure and Control valve 7B, and the other end is connected with vavuum pump, 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, and for reclaiming the methane gas of exhaust, the 3rd pump drainage control valve 14 one end are connected with vavuum pump, and the other end is as the output of gas product; First row venting control valve 6A is connected with the second adsorption tower-5B upper end with the first adsorption tower-5A respectively with second row venting control valve 6B one end, and the other end is connected with discharge 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 gas product methane in Vacuum Pressure Swing Adsorption enrichment coal mine wind-lack gas;
2) by a certain gas in the method enrichment mist of pressure-variable adsorption, 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 discharge to environment, has great economy and environment meaning.
4) gas that the present invention also can also contain the strong absorbed component such as methane, carbon dioxide, carbon monoxide for reclaiming other.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is process chart of the present invention;
In figure, be labeled as: air blast-1, air inlet surge tank-2, the first air intake control valve-3A, the second air intake control valve-3B, first takes out true control valve-4A, second takes out true control valve-4B, the first adsorption tower-5A, the second adsorption tower-5B, first row venting control valve-6A, second row venting 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, discharge gas surge tank-10, exhaust jet stream adjustable valve-11, vavuum pump-12.
The specific embodiment
Embodiment: the weary general mood body that is 0.2% by methane volume fraction 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 is pressurizeed by air blast 1, through air inlet surge tank 2 and the first air intake control valve 3A, the second air intake control valve 3B, flows into the first adsorption tower 5A, the second adsorption tower 5B.After strong absorbed component methane and part nitrogen and oxygen in adsorbent absorption 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 and is flowed out by discharge gas surge tank-10, exhaust jet stream adjustable valve-11 through first row venting control valve 6A, second row venting control valve 6B.Adsorption tower after absorption finishes is after equal pressure drop, and gas product 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 by the first Pressure and Control valve 7A, the second Pressure and Control valve 7B.First pump drainage control valve 8 one end are connected with the first Pressure and Control valve 7A, the second Pressure and Control valve 7B, and the other end is connected with vavuum pump, 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.Its circulation sequential is as shown in table 1, and the first adsorption tower 5A of take below describes separation process as example.
(1) unstripped gas, through air blast 1 pressurization, enters the first adsorption tower 5A through air inlet surge tank 2 and the first air intake control valve 3A, completes pressurising step;
(2) pressurising finishes rear unstripped gas and continues to enter the first adsorption tower 5A, and now first row gas control valve 6A opens, and gas methane in flow process is adsorbed, and the gas that contains lower methane volume fraction not being adsorbed is discharged by first row gas control valve 6A;
(3) after methane penetrates from the first adsorption tower 5A, close first row gas control valve 6A, open the first Pressure and Control valve 7A and the second Pressure and Control valve 7B all presses adsorption tower, now the first adsorption tower 5A internal pressure reduces, and the second adsorption tower 5B pressure raises;
(4) complete all and close the second Pressure and Control valve 7B and the first air intake control valve 3A after pressure, opening 8 couples of the first adsorption tower 5A of the first pump drainage control valve vacuumizes, the gases methane volume fraction of now extracting out is relatively low, and this part gas returns in unstripped gas through the second pump drainage control valve 13;
(5) pump drainage is closed the first pump drainage control valve 8 and the second pump drainage control valve 13 and is opened first and take out true control valve 4A and the 3rd pump drainage control valve 14 after finishing, and the gas of now extracting out is the gas product that contains higher methane volume fraction;
(6) vacuumize after end, 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 to equal voltage rise;
(7) repeating step (1)-(6).
So completed a circulation.
Table 1 circulation time-scale
In the present embodiment, the methane volume fraction of ventilation air gas gas is 0.2%.The adsorbent loading in the present embodiment is cocoanut active charcoal.In the present embodiment, technological parameter is as follows: unstripped gas adsorptive pressure after air blast boosts is up to 150kPa(absolute pressure), minimum parsing pressure 20 kPa(absolute pressures).In the present embodiment, in gas product, the volume fraction of methane is greater than 0.5%.
Claims (2)
1. with a coal mine wind-lack gas enrichment method for adsorption tower exhaust end pump drainage step, it is characterized in that the method by Vacuum Pressure Swing Adsorption realizes the enrichment of low-concentration methane gas, and introduce the processing step that vacuumizes discharge in adsorption process; In described vacuum pressure swing absorption process, methane gas is strong absorbed component, and the gas product that is rich in methane obtains in depressurization desorption process, the gas partial discharge vacuumizing in Vacuum Pressure Swing Adsorption; The adsorbent using in described vacuum pressure swing absorption process is for having the adsorbent of selective adsorption capacity to methane, adsorbent is zeolite molecular sieve, active carbon or metal-organic framework materials;
Wherein, pressure-variable adsorption separator comprises 2 adsorption towers, the technological process of vacuum pressure swing adsorption process mainly comprise boost, adsorb, all pressure drops, vacuumize discharge, vacuumize, equal these six steps of voltage rise, described Vacuum Pressure Swing Adsorption technological parameter is as follows: within adsorptive pressure is controlled at absolute pressure 0.1MPa～0.16MPa, within depressurization desorption pressure is controlled at absolute pressure 0.01MPa～0.08MPa, complete the adsorption tower of adsorption process after all pressure drop finishes, first utilize vavuum pump to bleed from adsorption tower exhaust end, this portion gas does not enter in gas product, the enriching apparatus adopting is comprised of following part: air blast (1), air inlet surge tank (2), the first air intake control valve (3A), the second air intake control valve (3B), first takes out true control valve (4A), second takes out true control valve (4B), the first adsorption tower (5A), the second adsorption tower (5B), first row venting control valve (6A), second row venting 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), discharge gas surge tank (10), exhaust jet stream adjustable valve (11), vavuum pump (12), air blast (1) is connected with the second adsorption tower (5B) lower end with the first adsorption tower (5A) respectively with the second air intake control valve (3B) by the first air intake control valve (3A) through air inlet surge tank (2), the first adsorption tower (5A) is taken out true control valve (4A) by first and is connected with vavuum pump (12), and the second adsorption tower (5B) is taken out true control valve (4B) by second and is connected with vavuum pump (12), the first adsorption tower (5A), first pump drainage control valve (8) one end are connected with the first Pressure and Control valve (7A), the second Pressure and Control valve (7B), and the other end is connected 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 (14) one end is connected with vavuum pump, and the other end is as the output of gas product, first row venting control valve (6A) is connected with the second adsorption tower (5B) upper end with the first adsorption tower (5A) respectively with second row venting control valve (6B) one end, and the other end is connected with discharge gas surge tank (10), exhaust jet stream adjustable valve (11) through check valve (9).
2. a kind of coal mine wind-lack gas enrichment method with adsorption tower exhaust end pump drainage step according to claim 1, is characterized in that: described coal mine wind-lack gas methane volume fraction is 0.2%; Described adsorbent adopts cocoanut active charcoal; Described adsorptive pressure is up to absolute pressure 150kPa, and described depressurization desorption pressure is minimum is absolute pressure 20kPa; The gas product methane volume fraction finally obtaining is greater than 0.5%.
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Families Citing this family (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) |
| 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 |
| 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 |
| 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 |
| CN113797704B (en) * | 2021-10-20 | 2022-07-12 | 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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