CN105879577A - Coalbed methane deoxidation and concentration method and device based on nitrogen displacement - Google Patents
Coalbed methane deoxidation and concentration method and device based on nitrogen displacement Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0454—Controlling adsorption
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- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40007—Controlling pressure or temperature swing adsorption
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Abstract
The invention relates to the technical field of pressure swing adsorption gas separation, and provides a coalbed methane deoxidation and concentration method based on nitrogen displacement. The method comprises the steps of 1 adsorption, wherein oxygen in coalbed methane is removed in an adsorption tower by adopting an adsorption method, and enriched product gas is obtained; 2 nitrogen displacement, wherein after adsorption is conducted, methane in the adsorption tower is displaced out by adopting a nitrogen displacement method; 3 desorption under reduced pressure, wherein the concentration of oxygen in the enriched product gas is 0.5% or below, and the concentration of methane in desorption gas obtained after nitrogen displacement is 5% or below. The invention further provides a device for conducting coalbed methane deoxidation and concentration through the method. The method and device have the advantages that the coalbed methane is extracted and concentrated through a pressure swing adsorption method, the effect is good, the investment and operation cost is low, and operation is flexible and convenient; part of methane in the adsorption tower is displaced out of the adsorption tower by adopting nitrogen displacement in the separation process, and therefore the methane recycling rate is increased; meanwhile, the concentration of methane in the desorption gas is lower than 5%, and therefore the security of the desorption process is guaranteed.
Description
Technical field
The present invention relates to PSA Gas Separation Technology field, particularly to a kind of coal bed gas based on nitrogen displacement
Deoxidation method for concentration and device.
Background technology
In coal bed gas, the content of methane is generally 20～45%, the shallow-layer Coal bed gas project within 2000 meters of China
It is about 36 tcms, similar with the total resources of natural gas, occupy third place in the world.At present, China
Every year because the coal bed gas of discharge of mining is more than 200 billion cubic meters, account for world's coal mining discharge coal bed gas total amount
1/3, rank first in the world.This not only pollutes environment, more causes the waste of mass energy resource.
The main cause that China's gas utilization rate is low is that coal bed gas concentration is low, has been mixed into big during extraction
The air of amount causes in coal bed gas containing substantial amounts of oxygen, brings some potential safety hazards to the utilization of coal bed gas, from
And constrain the utilization of coal bed gas.According to statistics, in 2013, coal bed gas extraction amount is 156 billion cubic meters, profit
Consumption is 66 billion cubic meters；By coal bed gas separating and concentrating, it is to improve gas utilization efficiency and benefit, reduces temperature
Room gas discharge and a kind of effective means of reasonable energy utilization resource.
Pressure-variable adsorption is little due to investment, and the advantages such as operating cost is low are closed in terms of gas separation field widely
Note.As patent CN85103557A describes the technology of a kind of pressure-swing adsorption concentration coal bed gas, with activated carbon for absorption
Agent, can be by methane concentration to more than 95% under conditions of adsorptive pressure is 0.5-1.0MPa.Use this technology
Build up China's first set processing coal bed gas tolerance in Jiaozhuo, Henan mineral bureau is 1.2 ten thousand m3The concentration commerical test in/sky
Device, successfully by the CH in coal bed gas4Volume fraction brings up to 63.9% from 30.4%, increases displacement step
After, can further improve 99.4%.Owing to adsorptive pressure is big, and in adsorption process, there is potential safety hazard, should
Technology is not promoted.Patent CN200780049073.8, CN200780048061.3,
CN200910058352.1、CN200910058351.7、CN200910062527.6、CN201320085124.5
Etc. being proposed the method for adsorbed methane to the methane being enriched with in coal bed gas, but use the method for adsorbed methane in absorption
During the problem that methane concentration is lowered into methane explosion limit cannot occur with avoiding.
Patent CN201310128860.9, CN201310128552.6,201510404258.2 propose employing nitrogen
The method of gas inerting, reduces the concentration of oxygen in unstripped gas by being mixed into nitrogen in unstripped gas, it is to avoid adsorption process enters
Explosion limit.But the method in use needs to be mixed into substantial amounts of nitrogen, this increases methane-rich undoubtedly
During separate difficulty, increase the energy consumption of methane separation.
Carry out separation after being removed by oxygen again and can solve safety problem during Enriching Coalbed Methane, such as patent
The method that CN201010256294.6, CN200910083925.6, CN201110136093.7 propose to use oxidation
It is enriched with again after removing oxygen, but this method will increase system complexity undoubtedly, and shine into the damage of methane
Consumption.
Patent CN200910312874.X proposes the method using pressure-variable adsorption removing oxygen, yet with absorption
Agent primary attachment oxygen, and adsorbent a small amount of methane, adsorbent gap also can leave portion of methane gas,
So it is likely to result in that oxygen concentration in stripping gas is higher and methane concentration is reduced to the situation of methane explosion limit, exists
Certain potential safety hazard.
Summary of the invention
The purpose of the present invention overcomes the deficiencies in the prior art exactly, it is provided that a kind of coal seam QI prostration based on nitrogen displacement
Oxygen method for concentration and device, the method replaced by nitrogen, use nitrogen from adsorption tower after adsorbent terminates
Inlet end injects adsorption tower, and the methane in adsorption tower displaces adsorption tower, reduces methane concentration in stripping gas, keeps away
Exempt to enter methane explosion limit, thus the deoxidation of application solutions coal bed gas concentrates.
A kind of coal bed gas deoxidation method for concentration based on nitrogen displacement of the present invention, comprises the following steps:
Step one, absorption；The method using pressure-variable adsorption removes the oxygen in coal bed gas in adsorption tower, obtains richness
Product gas after collection；
Step 2, nitrogen are replaced；After completing absorption, the method for nitrogen displacement is used to be put by the methane in adsorption tower
Swap out；
Step 3, depressurization desorption；
In product gas after described enrichment, oxygen concentration is below 0.5%；In stripping gas after nitrogen is replaced
The concentration of methane is below 5%.
Further, described coal bed gas deoxidation method for concentration based on nitrogen displacement includes boosting, absorption, nitrogen successively
Gas displacement, all pressure, five steps of depressurization desorption.
Further, the adsorptive pressure in described step one is 0.1MPa～0.9MPa, blood pressure lowering in described step 3
Desorption pressures is 0.01MPa～0.1MPa.
Further, the depressurization desorption step in described step 3 can be single depressurization desorption, it is also possible to for fall
Pressure and cleaning step common implementing complete desorbing.
Further, the displacement of the nitrogen of described step 2, after absorption terminates, nitrogen from adsorption tower inlet end to suction
Attached tower purges.
Further, in described step one, adsorbent is single adsorption agent or multiple adsorbent, in described adsorbent
At least one is oxygen selection type adsorbent.
Further, one or more during described adsorbent is carbon molecular sieve, zeolite molecular sieve, MOF.
Present invention also offers a kind of device for above-mentioned coal bed gas deoxidation method for concentration based on nitrogen displacement, bag
Include compressor, air inlet slow fill tank, the first air intake control valve, the second air intake control valve, the 3rd air intake control valve, the
One take out true control valve, second take out true control valve, the 3rd take out true control valve, the first adsorption tower, the second adsorption tower,
Three adsorption towers, the first product gas control valve, the second product gas control valve, three products gas control valve, first all press
Control valve, the second Pressure and Control valve, the 3rd Pressure and Control valve, the first nitrogen displacement control valve, the second nitrogen displacement
Control valve, the 3rd nitrogen displacement control valve, check valve, product gas is slow fills tank, product air-flow adjustable valve, vacuum
Pump；
Described air inlet is slow fills tank one end and is connected with described compressor, the other end pass through described first air intake control valve, the
Two air intake control valves, the 3rd air intake control valve respectively with described first adsorption tower, the second adsorption tower, the 3rd adsorption tower
Lower end connects；Described first adsorption tower, the second adsorption tower, the 3rd adsorption tower respectively by first take out true control valve,
Second take out true control valve, the 3rd take out true control valve and be connected with vacuum pump；
Described first Pressure and Control valve, the second Pressure and Control valve, the 3rd Pressure and Control valve, same pipeline is passed through in one end
Being interconnected, the other end is connected with described first adsorption tower, the second adsorption tower, the 3rd adsorption tower respectively；
Described first product gas control valve, the second product gas control valve and three products gas control valve one end respectively with institute
Stating the first adsorption tower, the second adsorption tower and the 3rd adsorption tower upper end to connect, the other end is all with described check valve one end even
Connect, the described check valve other end and described product gas is slow fill tank is connected, described product gas delay fill tank also with described product
Air-flow adjustable valve is connected；
Described first nitrogen displacement control valve, the second nitrogen displacement control valve, the 3rd nitrogen displacement control valve one end are divided
Not being connected with described first adsorption tower, the second adsorption tower and the 3rd adsorption tower lower end, the other end is connected to same nitrogen
Air supply pipe.
Further, in described device, the quantity of adsorption tower is more than 3.
The invention have the benefit that
(1) in separation process, methane is as weakly stable phase component, and product gas can make the pressure conveying of the methane product band of gas
It is easy to utilize；
(2) separation process uses nitrogen to replace adsorption tower, it can be ensured that in stripping gas, methane concentration is less than 5%
Guarantee the safety of desorption process；
(3) separation process uses nitrogen displacement portion of methane in adsorption tower can be displaced adsorption tower, can improve
Methane recovery；
(4) by the method concentration coal bed gas of pressure-variable adsorption, its initial cost is low, and operating cost is low, flexible operation
Convenient；
The present invention can make coal bed gas be fully utilized, and improves coal mining enterprise's economy to gas utilization,
Reduce CBM Drainage to be rivals in a contest the pollution of environment, there is great economy and Significance for Environment.
Accompanying drawing explanation
Fig. 1 show the apparatus structure of a kind of coal bed gas deoxidation method for concentration based on nitrogen displacement of the embodiment of the present invention
Schematic diagram.
In figure: 1-compressor, 2-air inlet be slow fill tank, 31-the first air intake control valve, 32-the second air intake control valve,
33-the 3rd air intake control valve, 41-first take out true control valve, 42-second takes out true control valve, 43-the 3rd takes out true control
Valve, 51-the first adsorption tower, 52-the second adsorption tower, 53-the 3rd adsorption tower, 61-the first product gas control valve,
62-the second product gas control valve, 63-three products gas control valve, 71-the first Pressure and Control valve, 72-second all press
Control valve, 73-the 3rd Pressure and Control valve, 81-the first nitrogen displacement control valve, the displacement of 82-the second nitrogen control
Valve, 83-the 3rd nitrogen displacement control valve, 9-check valve, 10-product gas are slow fills tank, the regulation of 11-product throughput
Valve, 12-vacuum pump.
Detailed description of the invention
The specific embodiment of the invention is described in detail below in conjunction with concrete accompanying drawing.It should be noted that, following embodiment
Described in technical characteristic or the combination of technical characteristic be not construed as isolating, they can be by mutual group
Close thus reach superior technique effect.In the accompanying drawing of following embodiment, the identical label generation that each accompanying drawing is occurred
Feature that table is identical or parts, can be applicable in different embodiment.
As it is shown in figure 1, the embodiment of the present invention a kind of based on nitrogen displacement coal bed gas deoxidation method for concentration, including with
Lower step:
Step one, absorption；The method using absorption removes the oxygen in coal bed gas, after being enriched with in adsorption tower
Product gas；
Step 2, nitrogen are replaced；After completing absorption, the method for nitrogen displacement is used to be put by the methane in adsorption tower
Swap out；
Step 3, depressurization desorption；
In product gas after described enrichment, oxygen concentration is below 0.5%；In stripping gas after nitrogen is replaced
The concentration of methane is below 5%.
In the present embodiment, described coal bed gas deoxidation method for concentration based on nitrogen displacement includes boosting successively, inhales
Attached, nitrogen displacement, all pressure, five steps of depressurization desorption.
Adsorptive pressure in described step one is 0.1MPa～0.9MPa, and in described step 3, depressurization desorption pressure is
0.01MPa～0.1MPa.
Depressurization desorption step in described step 3 can be single depressurization desorption, it is also possible to for blood pressure lowering and cleaning step
Rapid common implementing completes desorbing.
The nitrogen displacement of described step 2, after absorption terminates, adsorption tower is blown by nitrogen from adsorption tower inlet end
Sweep.
In described step one, adsorbent is single adsorption agent or multiple adsorbent, at least a kind of in described adsorbent
For oxygen selection type adsorbent.
Described adsorbent can select one or more in carbon molecular sieve, zeolite molecular sieve, MOF.
In actually used, coal bed gas under high pressure flows into adsorption tower, oxygen and part nitrogen and is adsorbed by adsorbent, not
The gas being adsorbed by adsorbent, as the methane product gas after enrichment, flows out from adsorption tower exhaust end；Adsorption process
After end, nitrogen is sent into from the adsorption tower inlet end just terminating adsorption process, now adsorption tower internal adsorption agent gap and
The methane of adsorption tower exhaust end is displaced adsorption tower；Before treating oxygen penetration, stop nitrogen air inlet, then adsorption tower
Blood pressure lowering also completes desorption procedure, it can be ensured that in stripping gas methane concentration less than 5% so that it is guaranteed that the peace of resolving
Entirely.
A kind of device for above-mentioned coal bed gas deoxidation method for concentration based on nitrogen displacement, including compressor 1, enters
Gas is slow fills tank the 2, first air intake control valve the 31, second air intake control valve the 32, the 3rd air intake control valve 33, first
Take out true control valve 41, second take out true control valve the 42, the 3rd and take out true control valve the 43, first adsorption tower 51, second and inhale
Attached tower the 52, the 3rd adsorption tower the 53, first product gas control valve the 61, second product gas control valve 62, three products
Gas control valve the 63, first Pressure and Control valve the 71, second Pressure and Control valve the 72, the 3rd Pressure and Control valve 73, first
Nitrogen displacement control valve the 81, second nitrogen displacement control valve the 82, the 3rd nitrogen displacement control valve 83, check valve
9, product gas is slow fills tank 10, product air-flow adjustable valve 11, vacuum pump 12；
Described air inlet is slow fills tank 2 one end and is connected with described compressor 1, and the other end is by described first air intake control valve
31, the second air intake control valve the 32, the 3rd air intake control valve 33 adsorbs with described first adsorption tower 51, second respectively
Tower the 52, the 3rd adsorption tower 53 lower end connects；Described first adsorption tower the 51, second adsorption tower the 52, the 3rd absorption
Tower 53 is respectively by first taking out true control valve 41, second taking out true control valve the 42, the 3rd and take out true control valve 43 with true
Empty pump 12 is connected；
Described first Pressure and Control valve the 71, second Pressure and Control valve the 72, the 3rd Pressure and Control valve 73, one end is passed through
Same pipeline is interconnected, and the other end adsorbs with described first adsorption tower the 51, second adsorption tower the 52, the 3rd respectively
Tower 53 connects；
Described first product gas control valve the 61, second product gas control valve 62 and three products gas control valve 63 1
End is connected with described first adsorption tower the 51, second adsorption tower 52 and the 3rd adsorption tower 53 upper end respectively, the other end
All be connected with described check valve 9 one end, described check valve 9 other end and described product gas is slow fill tank 10 be connected,
Described product gas is slow to be filled tank 10 and is also connected with described product air-flow adjustable valve 11；
Described first nitrogen displacement control valve the 81, second nitrogen displacement control valve the 82, the 3rd nitrogen displacement control valve
83 one end are connected with described first adsorption tower the 51, second adsorption tower 52 and the 3rd adsorption tower 53 inlet end respectively,
The other end is connected to same nitrogen air supply pipe.
In the present embodiment, the quantity of adsorption tower is 3, but the quantity of adsorption tower can be more than 3.
When utilizing the present embodiment device to carry out coal bed gas deoxidation concentration based on nitrogen displacement, unstripped gas is by compressor 1
Compression, delays through air inlet and fills tank 2 and air intake control valve 31,32,33 inflow adsorption tower 51,52,53；Adsorption tower
51, after the strong absorbed component oxygen in the adsorbent unstripped gas in 52,53 and part nitrogen, high methane gas
Body flows out from the exhaust end of adsorption tower 51,52,53 through product gas control valve 61,62,63 as product gas；Inhale
After attached end, nitrogen separately flows into adsorption tower 51,52,53 through nitrogen displacement control valve 81,82,83, replaced
Methane-rich gas flowed out from the exhaust end of adsorption tower 51,52,53 by product gas control valve 61,62,63；
Close replacement product gas control valve 61,62,63 after replacement completion, open Pressure and Control valve 71,72,73 to suction
Attached tower 51,52,53 is all pressed；Adsorption tower 51,52,53 is after equal pressure drop, and waste gas is by vacuum pump 12 warp
Take out true control valve 41,42,43 to extract out from adsorption tower 51,52,53；Pressure equalizing passes through Pressure and Control valve
71,72,73 realize；Nitrogen displacement control valve 81,82,83 controls the nitrogen of adsorption tower 51,52,53 respectively
Gas displacement step.
As a example by the first adsorption tower 51, separation process is illustrated below:
(1) unstripped gas through compressor 1, air inlet is slow fills tank 2, enters the first absorption from the first air intake control valve 31
Tower 51, completes the boosting step of the first adsorption tower 51；
(2), after boosting step terminates, the first product gas control valve 61 is opened, and gas not to be adsorbed is (predominantly
Methane and nitrogen) through check valve 9, product gas is slow fills tank 10, enters product gas after product air-flow adjustable valve 11
Pipeline；
(3) after the first adsorption tower 51 absorption terminates, close the first air intake control valve 31, open the first nitrogen
Displacement control valve 81, nitrogen flows into the first adsorption tower 51 and replaces；
(4) treat to stop before oxygen penetration nitrogen displacement step, now close the first nitrogen displacement valve 81, close the
One product gas control valve 61；Afterwards, the first Pressure and Control valve 71 and the 3rd Pressure and Control valve 73 is opened, by first
Adsorption tower 51 connects with the 3rd adsorption tower 53, it is achieved the first adsorption tower 51 and all pressures of the 3rd adsorption tower 53；
(5), after all pressure terminates, close the first Pressure and Control valve 71 and the 3rd Pressure and Control valve 73, open first
Taking out true control valve 41 to the first adsorption tower 51 evacuation, the gas now extracted out is waste gas；
(6), after evacuation terminates, the first adsorption tower 51 is carried out all by the second adsorption tower 52 completing replacement process
Pressure rises, and now opens the first Pressure and Control valve 71 and the second Pressure and Control valve 72；
(7) step (1) is repeated back to.
The circulation sequential of this flow process is as shown in table 1.
Table 1 three tower circulation time-scale
In the present embodiment, coal bed gas methane volumetric mark is 35%, and remaining part is dry air；The present embodiment fills
Filling out adsorbent is carbon molecular sieve；In the present embodiment, technological parameter is as follows, adsorptive pressure 350kPa, lower desorption pressure
Power 50kPa；In the present embodiment, the product gas methane volumetric mark after enrichment is more than 55%, and oxygen concentration is less than 0.5%,
The response rate is more than 90%.
The invention have the benefit that
(1) in separation process, methane is as weakly stable phase component, and product gas can make the pressure conveying of the methane product band of gas
It is easy to utilize；
(2) separation process uses nitrogen to replace adsorption tower, it can be ensured that in stripping gas, methane concentration is less than
5%, so that it is guaranteed that the safety of desorption process；
(3) separation process uses nitrogen displacement portion of methane in adsorption tower can be displaced adsorption tower, can improve
Methane recovery；
(4) by the method concentration coal bed gas of pressure-variable adsorption, its initial cost is low, and operating cost is low, flexible operation
Convenient.
The present invention can make coal bed gas be fully utilized, and improves coal mining enterprise's economy to gas utilization,
Reduce CBM Drainage to be rivals in a contest the pollution of environment, there is great economy and Significance for Environment.
Although having been presented for several embodiments of the present invention herein, it will be appreciated by those of skill in the art that
Without departing from the spirit of the invention, the embodiments herein can be changed.Above-described embodiment simply shows
Example, should be using the embodiments herein as the restriction of interest field of the present invention.
Claims (9)
1. a coal bed gas deoxidation method for concentration based on nitrogen displacement, it is characterised in that comprise the following steps:
Step one, absorption；The method using absorption removes the oxygen in coal bed gas in adsorption tower, the product gas after being enriched with；
Step 2, nitrogen are replaced；After completing absorption, the method for nitrogen displacement is used to be displaced by the methane in adsorption tower；
Step 3, depressurization desorption；
In product gas after described enrichment, oxygen concentration is below 0.5%；In stripping gas after nitrogen is replaced, the concentration of methane is below 5%.
2. as claimed in claim 1 coal bed gas deoxidation method for concentration based on nitrogen displacement, it is characterised in that described coal bed gas deoxidation method for concentration based on nitrogen displacement includes boosting, absorption, nitrogen displacement, all pressure, five steps of depressurization desorption successively.
3. the coal bed gas deoxidation method for concentration replaced based on nitrogen as claimed in claim 1, it is characterised in that the adsorptive pressure in described step one is 0.1MPa～0.9MPa, and in described step 3, depressurization desorption pressure is 0.01MPa～0.1MPa.
4. the coal bed gas deoxidation method for concentration replaced based on nitrogen as claimed in claim 1, it is characterised in that the depressurization desorption step in described step 3 is single depressurization desorption or completes desorbing for blood pressure lowering and cleaning step common implementing.
5. the coal bed gas deoxidation method for concentration replaced based on nitrogen as claimed in claim 1, it is characterised in that the nitrogen displacement of described step 2, after absorption terminates, adsorption tower is purged by nitrogen from adsorption tower inlet end.
6. the coal bed gas deoxidation method for concentration replaced based on nitrogen as claimed in claim 1, it is characterised in that in described step one, adsorbent is single adsorption agent or multiple adsorbent, and in described adsorbent, at least one is oxygen selection type adsorbent.
7. the coal bed gas deoxidation method for concentration replaced based on nitrogen as claimed in claim 6, it is characterised in that described adsorbent is one or more in carbon molecular sieve, zeolite molecular sieve, MOF.
8. the device for coal bed gas deoxidation method for concentration based on nitrogen displacement as described in any one of claim 1-7, it is characterized in that, including compressor, air inlet is slow fills tank, first air intake control valve, second air intake control valve, 3rd air intake control valve, first takes out true control valve, second takes out true control valve, 3rd takes out true control valve, first adsorption tower, second adsorption tower, 3rd adsorption tower, first product gas control valve, second product gas control valve, three products gas control valve, first Pressure and Control valve, second Pressure and Control valve, 3rd Pressure and Control valve, first nitrogen displacement control valve, second nitrogen displacement control valve, 3rd nitrogen displacement control valve, check valve, product gas is slow fills tank, product air-flow adjustable valve, vacuum pump；
Described air inlet is slow fills tank one end and is connected with described compressor, and the other end passes through described first air intake control valve, the second air intake control valve, the 3rd air intake control valve are connected with described first adsorption tower, the second adsorption tower, the 3rd adsorption tower inlet end respectively；Described first adsorption tower, the second adsorption tower, the 3rd adsorption tower are respectively by first taking out true control valve, second taking out true control valve, the 3rd take out true control valve and be connected with vacuum pump；
Described first Pressure and Control valve, the second Pressure and Control valve, the 3rd Pressure and Control valve, one end is interconnected by same pipeline, and the other end is connected with described first adsorption tower, the second adsorption tower, the 3rd adsorption tower respectively；
Described first product gas control valve, the second product gas control valve and three products gas control valve one end are connected with described first adsorption tower, the second adsorption tower and the 3rd adsorption tower upper end respectively, the other end is all connected with described check valve one end, and the described check valve other end and described product gas is slow fills that tank is connected, described product gas delays and fills tank and be also connected with described product air-flow adjustable valve；
Described first nitrogen displacement control valve, the second nitrogen displacement control valve, the 3rd nitrogen displacement control valve one end are connected with described first adsorption tower, the second adsorption tower and the 3rd adsorption tower lower end respectively, and the other end is connected to same nitrogen air supply pipe.
9. the device for coal bed gas deoxidation method for concentration based on nitrogen displacement as claimed in claim 7, it is characterised in that in described device, the quantity of adsorption tower is more than 3.
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| CN106823686A (en) * | 2017-01-20 | 2017-06-13 | 山东恒业石油新技术应用有限公司 | Closed cycle type molecular sieve performance test machine |
| CN108043172A (en) * | 2017-12-18 | 2018-05-18 | 洛阳健阳科技有限公司 | A kind of method of zeolite molecular sieve separation of methane and nitrogen |
| CN108441273A (en) * | 2018-04-02 | 2018-08-24 | 东北大学 | Oxygen-containing low concentration combustible gas method of deoxidation and deoxygenation system |
| CN109126381A (en) * | 2018-09-13 | 2019-01-04 | 北京北大先锋科技有限公司 | A kind of method that pressure-variable adsorption removes carbon dioxide in industrial gasses |
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| CN109173568B (en) * | 2018-09-26 | 2020-11-27 | 南京兆博环保科技有限公司 | Active carbon level difference adsorption safe concentration method |
| CN112742170A (en) * | 2019-10-31 | 2021-05-04 | 中国石油化工股份有限公司 | Method for purifying high-nitrogen-content energy gas |
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