CN108031240A - A kind of device based on HEU type zeolite molecular sieve separation of methane and nitrogen - Google Patents
A kind of device based on HEU type zeolite molecular sieve separation of methane and nitrogen Download PDFInfo
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- CN108031240A CN108031240A CN201711361073.3A CN201711361073A CN108031240A CN 108031240 A CN108031240 A CN 108031240A CN 201711361073 A CN201711361073 A CN 201711361073A CN 108031240 A CN108031240 A CN 108031240A
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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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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- 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
- C10L3/105—Removal of contaminants of nitrogen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
- B01D2253/108—Zeolites
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
Invention describes a kind of device based on HEU type zeolite molecular sieve separation of methane and nitrogen；Delay including compressor, air inlet fill tank, product gas is delayed and fills tank, vacuum pump, first group of adsorbing mechanism, second group of adsorbing mechanism；First group of adsorbing mechanism includes the first air intake control valve, the true control valve of the first pumping, the first adsorption tower, the first product gas control valve, the first Pressure and Control valve, the first purge control valve；Second group of adsorbing mechanism includes the second air intake control valve, the true control valve of the second pumping, the second adsorption tower, the second product gas control valve, the second Pressure and Control valve, the second purge control valve.The present invention is by the Methods For Purification methane of pressure-variable adsorption, its initial cost is low, and operating cost is low, flexible and convenient operation, and purification efficiency is high, and adsorbent separating property is stablized, and can effectively save the energy.
Description
Technical field
The present invention relates to a kind of separation of gas and purifier field technology, particularly one kind to be based on HEU type zeolite molecules
The device of sieve separation methane and nitrogen.
Background technology
Natural gas is a kind of clean energy resource based on methane, recently as expanding economy and people's living standard
Improve, more and more people's concern for the environment problem, is increasingly taken seriously using natural gas as primary energy, the institute in primary energy
Accounting example is also higher and higher.
Natural gas is mainly supplied in the form of pipeline, generally requires heating value of natural gas in more than 31.4MJ（Methane concentration exists
More than 95%）.But current conventional gas and Unconventional gas（Coal bed gas, shale gas）Deng often containing in gatherer process
There are substantial amounts of foreign gas, such as nitrogen, carbon dioxide, hydrogen sulfide.
Pressure-variable adsorption is small due to investing, and the advantages such as operating cost is low are widely paid close attention in terms of gas separation field.
Patent CN85103557A describes a kind of technology of pressure-swing adsorption concentration coal mine gas, using activated carbon as adsorbent, in adsorption pressure
Power can be by methane concentrate to more than 95% under conditions of being 0.5-1.0 MPa.Built up using the technology in Henan Jiaozhuo mineral bureau
First set processing coal bed gas tolerance in China is the 1.2 ten thousand concentration commerical test devices of m3/ days, successfully by the CH4 in coal bed gas
Volume fraction brings up to 63.9% from 30.4%, after increasing displacement step, can further improve to 99.4%.But the transformation is inhaled
Attached partition method is existed using the method for adsorbed methane, and the methane gas of high concentration is obtained in low-pressure side.Using this method to methane into
Row purification, can cause product atmospheric pressure low, it is necessary to which additional boost ensures further conveying and utilizes, and boosts in adsorption process
Energy afterwards really wastes.For the relatively low high concentration methane feed gas of foreign gas nitrogen, such as using the side of adsorbed methane
Method is enriched with, and needs adsorbent to have larger adsorption capacity.
It is a kind of very good to carry out enrichment using the method for the absorption nitrogen methane-containing gas higher to methane concentration
Method, just can realize that methane is purified in high-pressure side with this method, consequently facilitating further compression and utilization, reduce running cost
With.But the kinetics radius of N2, CH4 are respectively closely 3.64,3.82, and boiling point is also sufficiently close to, and is nonpolar
Gas, it is always in pressure-variable adsorption separation process to use the method adsorbing separation nitrogen of absorption nitrogen and methane based on above reason
A difficult point.
Carbon molecular sieve can control the mass transfer velocity in gas access holes road by adjustment aperture, so as to fulfill separation.But due to
Carbon molecular sieve surface polarity is relatively low and has stronger hydrophobic performance, has stronger absorption property to methane, causes adsorbent to nitrogen
The selectivity of gas substantially reduces.Researcher has carried out Separation Research using bi-component gas of the carbon molecular sieve for N2/CH4, refers to
Go out the rates of adsorption of N2 on the sorbent and be much larger than CH4, but the equilibrium adsorption capacity of adsorbent is the big N2 of CH4, from
And it have impact on the separating capacity of CH4/N2 mixed gas.From the point of view of result of study, the methane that its equilibrium separation performance goes out is put down
Weighing apparatus separating capacity is much higher than dynamics separating capacity, directly affects its separating property to nitrogen and methane binary composition.
HEU type zeolite molecular sieves are the adsorbents for being quite suitable for methane nitrogen always, can by the adjusting of pore size
Zeolite molecular sieve is adjusted to the adsorbent of nitrogen balance selection type and nitrogen selection of kinetics type.Clinoptilolite is in transformation at present
Research in terms of adsorbing separation methane nitrogen is based primarily upon natural zeolite and carbon molecular sieve.The present invention is by using HEU type zeolites
Molecular sieve carries out absorption purification to the methane-rich gas containing a small amount of foreign gas nitrogen.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of based on HEU type zeolite molecular sieve separation of methane and nitrogen
Device, flexible and convenient operation, performance are stablized, and the separation of methane nitrogen binary composition is realized by the method for pressure-variable adsorption, adsorb
The adsorbent of filling be novel artificial clinoptilolite in tower, in novel artificial synthesis zeolite cation be Li, Na, K,
The combination of one or more cations in Mg, Sr, Ce, has nitrogen selective absorption characteristic, energy Preferential adsorption nitrogen can
To be the nitrogenous Natural Gas Enrichment of 20-80% to more than 95% by methane concentration, and the rate of recovery is more than 70%.
In order to realize the purpose for solving above-mentioned technical problem, present invention employs following technical solution：
A kind of device based on HEU type zeolite molecular sieve separation of methane and nitrogen, including compressor, air inlet delay and fill tank, product gas
It is slow to fill tank, vacuum pump, first group of adsorbing mechanism, second group of adsorbing mechanism；
First group of adsorbing mechanism includes the first air intake control valve, the true control valve of the first pumping, the first adsorption tower, the control of the first product gas
Valve, the first Pressure and Control valve, the first purge control valve；
Second group of adsorbing mechanism includes the second air intake control valve, the true control valve of the second pumping, the second adsorption tower, the control of the second product gas
Valve, the second Pressure and Control valve, the second purge control valve；
The air inlet, which is delayed, fills tank one end and is connected with compressor, and the other end passes through the first air intake control valve, the second air intake control valve point
It is not connected with the first adsorption tower, the second adsorption tower lower end, the first adsorption tower, the lower end of the second adsorption tower are respectively the first absorption
The inlet end of tower, the second adsorption tower；First adsorption tower, the inlet end of the second adsorption tower take out true control by first respectively
Valve, second take out true control valve and are connected with vacuum pump；When the first air intake control valve is opening, the second air intake control valve is pass
Closed state；When the second air intake control valve is opening, the first air intake control valve is in off state；When the first true control valve of pumping
For opening when, second, which takes out true control valve, is in off state；When it is opening that second, which takes out true control valve, first takes out true control
Valve processed is in off state；
The first Pressure and Control valve, the second Pressure and Control valve, one end are interconnected by same pipeline, and the other end is respectively with
The upper end connection of one adsorption tower, the second adsorption tower；First adsorption tower, the upper end of the second adsorption tower are respectively the first adsorption tower,
The outlet side of two adsorption towers；When the first Pressure and Control valve is in off state with the second Pressure and Control valve used time for unlatching or together；
The first product gas control valve, second product gas control valve one end respectively with the first adsorption tower, the second adsorption tower outlet
End connection, the other end fill tank and are connected with delaying with product gas；When the first product gas control valve is opening, the second product gas
Control valve is in off state；When the second product gas control valve is opening, the first product gas control valve is in off state；
First purge control valve, second purge control valve one end are connected with product gas surge tank respectively, the other end respectively with
The outlet side connection of first adsorption tower, the second adsorption tower；When the first purge control valve is opening, the second purge control valve
It is in off state；When the second purge control valve is opening, the first purge control valve is in off state.
Further, the device of the zeolite molecular sieve separation of methane and nitrogen further includes check valve, and check valve is arranged on
Product gas, which is delayed, fills between tank and the first product gas control valve, the second product gas control valve.
Further, the device of the zeolite molecular sieve separation of methane and nitrogen further includes product gas flow control valve, production
Product air-flow adjustable valve is arranged on product gas and delays the outlet side for filling tank.
Further, first adsorption tower, the second adsorption tower are arranged to one or more.
Further, first adsorption tower, the second absorption tower bottom can add partially dehydrated according to the demand of unstripped gas
With the adsorbent of carbon dioxide removal.
Further, the device of the zeolite molecular sieve separation of methane and nitrogen further includes vacuum pump control valve, exhaust side
Road and By-pass vent valve；Vacuum pump control valve is arranged on vacuum pump front end, and first takes out true control valve, the second true control valve phase of pumping
Even；Discharge bypass is taken out from vacuum pump control valve and first and is drawn between true control valve, the second true control valve of pumping, and By-pass vent valve is set
Put in discharge bypass.Vacuum pump control valve, discharge bypass and By-pass vent valve are set；So that can also in depressurization desorption step
Without vacuumizing, directly open and take out true control valve and By-pass vent valve by the way that the gas of adsorption tower is discharged so that adsorption tower pressure
Power reduces, so as to carry out depressurization desorption.
The device used includes two groups of adsorbing mechanisms, and causes two groups of adsorbing mechanisms to be respectively at different working statuses,
When first group of adsorbing mechanism carries out boosting step, adsorption step, second group of adsorbing mechanism carries out depressurization desorption step, cleaning step
Suddenly；Then first group of adsorbing mechanism and second group of adsorbing mechanism respectively enter decompression pressure step and boosting and press step at the same time,
First group of adsorbing mechanism, which obtains being depressured, presses, and second group of adsorbing mechanism, which obtains boosting, presses；Then first group of adsorbing mechanism carries out
Depressurization desorption step, cleaning step；Second group of adsorbing mechanism carries out boosting step, adsorption step；Then first group of adsorbing mechanism
Respectively enteing boosting at the same time with second group of adsorbing mechanism presses step and decompression to press step, and first group of adsorbing mechanism is boosted
Press, second group of adsorbing mechanism, which obtains being depressured, presses；Adsorbing mechanism after boosting is pressed enters boosting step, is depressured the suction pressed
Random structure enters depressurization desorption step；Such cycle operation.
The working method of wherein first group adsorbing mechanism is：Unstripped gas is delayed through air inlet by compressor compresses and is filled tank and first
Air intake control valve flows into the first adsorption tower, is boosting step；The strong suction in adsorbent absorption unstripped gas in first adsorption tower
After attached component nitrogen, methane-rich gas is flowed out as product gas from the exhaust end of the first adsorption tower through the first product gas control valve to be led to
Cross check valve into product gas surge tank be adsorption step；；Terminate adsorption step before adsorbent adsorption saturation；Adsorption step
After close the first product gas control valve, open the first Pressure and Control valve and the first adsorption tower pressed, as decompression is
Press step；The second Pressure and Control valve is opened at the same time, is boosted and presses step, until the first adsorption tower and the second adsorption column pressure
Balance；For first adsorption tower after equal pressure drop, residual gas, that is, exhaust gas of the first adsorption tower takes out true control valve by vacuum pump through first
Extracted out from the first adsorption tower, be depressurization desorption step；Enter cleaning step after depressurization desorption step, open the first cleaning control
Valve processed, product gas flow into the first adsorption tower from product gas surge tank through the exhaust end of the first purge control valve and the first adsorption tower,
True control valve is taken out by first to flow out from the first adsorption tower inlet end, and the first adsorption tower is cleaned；After cleaning step,
Close first and take out true control valve, the first purge control valve, then the first adsorption tower presses step into boosting, opens first and presses
Control valve, while the second Pressure and Control valve is opened, the second adsorption tower presses step into decompression, until the first adsorption tower and second
Adsorption column pressure balances；Then the first adsorption tower enters boosting step, and the second adsorption tower enters depressurization desorption step；So follow
Ring.
The working method of second group of adsorbing mechanism is：Unstripped gas is delayed through air inlet by compressor compresses and is filled tank and the second air inlet
Control valve flows into the second adsorption tower, is boosting step；Then the strong suction in the adsorbent absorption unstripped gas in the second adsorption tower
After attached component nitrogen, methane-rich gas is flowed out as product gas from the exhaust end of the second adsorption tower through the second product gas control valve to be led to
Cross check valve into product gas surge tank be adsorption step；Terminate adsorption step before adsorbent adsorption saturation；Adsorption step
After close the second product gas control valve, open the second Pressure and Control valve and the second adsorption tower pressed, as decompression is
Press step；The first Pressure and Control valve is opened at the same time, is boosted and presses step, until the second adsorption tower and the first adsorption column pressure
Balance；For second adsorption tower after equal pressure drop, residual gas, that is, exhaust gas of the second adsorption tower takes out true control valve by vacuum pump through second
Extracted out from the second adsorption tower, be depressurization desorption step；Enter cleaning step after depressurization desorption step, open the second cleaning control
Valve processed, product gas flow into the second adsorption tower from product gas surge tank through the exhaust end of the second purge control valve and the second adsorption tower,
True control valve is taken out by second to flow out from the second adsorption tower inlet end, and the second adsorption tower is cleaned；After cleaning step,
Close second and vacuumize control valve, the second purge control valve, then the second adsorption tower presses step into boosting, and it is equal to open second
Pressure control valve, while the first Pressure and Control valve is opened, the first adsorption tower presses step into decompression, until the second adsorption tower and the
One adsorption column pressure balances；Then the second adsorption tower enters boosting step, and the first adsorption tower enters depressurization desorption step；So follow
Ring.
By using above-mentioned technical proposal, the present invention has following beneficial effect：
1st, the crystallinity and cation of adsorbent can be effectively controlled as adsorbent using novel artificial synthesis zeolite
Composition is consistent, it is ensured that adsorbent separating property is stablized.
2nd, methane is purified using the method for absorption nitrogen, it is possible to achieve methane is having pressure side enrichment, can be effective
The energy is saved, easy to further pressurize or directly transport and utilize.
3rd, by the Methods For Purification methane of pressure-variable adsorption, due to first group of adsorbing mechanism and second group of adsorbing mechanism same time-division
It Jin Ru not boost and press step and decompression to press step, an adsorption tower obtains boosting while press, another adsorption tower obtains
Pressed to decompression；Also the product gas for the adsorption tower for pressing step into boosting is allowd to be again introduced into adsorption step.It is just thrown
Provide low, operating cost is low, flexible and convenient operation, is more removed nitrogen therein, and purification efficiency is high.
4th, by setting vacuum pump control valve, discharge bypass and By-pass vent valve；So that can also in depressurization desorption step
Without vacuumizing, directly open and take out true control valve and By-pass vent valve by the way that the gas of adsorption tower is discharged so that adsorption tower pressure
Power reduces, so as to carry out depressurization desorption.
Brief description of the drawings
Fig. 1 is the overall schematic of this patent.
Fig. 2 is the schematic diagram that Fig. 1 adds vacuum pump control valve, discharge bypass and By-pass vent valve.
In figure：1- compressors, 2- air inlets, which are delayed, fills tank, the first air intake control valves of 31-, the second air intake control valves of 32-, 41-
One takes out true control valve, and 42- second takes out true control valve, the first adsorption towers of 51-, the second adsorption towers of 52-, the control of the first product gas of 61-
Valve, 62- the second product gas control valves, 71- the first Pressure and Control valves, 72- the second Pressure and Control valves, the first purge control valves of 81-,
The second purge control valves of 82-, 9- check valves, 10- product gas, which is delayed, fills tank, 11- product gas flow control valves, 12- vacuum pumps, 13-
Vacuum pump control valve, 14- By-pass vent valves.
Embodiment
This patent is further explained below in conjunction with the accompanying drawings.But the protection domain of this patent is not limited to specifically implement
Mode.
Embodiment 1
Unstripped gas is that the gaseous mixture methane volumetric fraction of methane and nitrogen is 30-80% in the present embodiment, and remaining part is nitrogen；
It is novel artificial synthesis zeolite that adsorbent is loaded in the present embodiment；Technological parameter is in the present embodiment：Highest is inhaled
Enclosure pressure 200kPa, minimum desorption pressures 10kPa；Product gas methane volumetric fraction after being enriched with the present embodiment is more than 95%, returns
Yield is more than 70%.
As shown in the figure, a kind of device based on HEU type zeolite molecular sieve separation of methane and nitrogen of this patent, including compression
Machine 1, air inlet delay fill tank 2, product gas is delayed and fills 9, first groups of tank 10, product gas flow control valve 11, vacuum pump 12, check valve absorption
Mechanism, second group of adsorbing mechanism；
First group of adsorbing mechanism includes the first air intake control valve 31, first and takes out true control valve 41, the first adsorption tower 51, the first product
Gas control valve 61, the first Pressure and Control valve 71, the first purge control valve 81；
Second group of adsorbing mechanism includes the second air intake control valve 32, second and takes out true control valve 42, the second adsorption tower 52, the second product
Gas control valve 62, the second Pressure and Control valve 72, the second purge control valve 82；
First adsorption tower 51, the second adsorption tower 52 respectively set one, bottom according to the demand of unstripped gas can add it is partially dehydrated and
The adsorbent of carbon dioxide removal.
Air inlet, which is delayed, fills 2 one end of tank and is connected with compressor 1, and the other end passes through the first air intake control valve 31, the second air inlet controls
Valve 32 is connected with the first adsorption tower 51,52 lower end of the second adsorption tower respectively, the first adsorption tower 51, the lower end point of the second adsorption tower 52
Wei not the first adsorption tower 51, the inlet end of the second adsorption tower 52；First adsorption tower 51, the inlet end of the second adsorption tower 52 lead to respectively
The true control valve 42 of the true pumping of control valve 41, second of the first pumping is crossed with vacuum pump 12 to be connected；When the first air intake control valve 31 is opening state
During state, the second air intake control valve 32 is in off state；When the second air intake control valve 32 is opening, the first air intake control valve
31 are in off state；When it is opening that first, which takes out true control valve 41, second, which takes out true control valve 42, is in off state；When second
When to take out true control valve 42 be opening, first, which takes out true control valve 41, is in off state；
First Pressure and Control valve 71, the second Pressure and Control valve 72, one end are interconnected by same pipeline, and the other end is respectively with
The upper end connection of one adsorption tower 51, the second adsorption tower 52；First adsorption tower 51, the upper end of the second adsorption tower 52 are respectively the first suction
The outlet side of attached tower 51, the second adsorption tower 52；When the first Pressure and Control valve 71 and 72 used time of the second Pressure and Control valve to open or
It is same to be in off state；
First product gas control valve 61,62 one end of the second product gas control valve respectively with the first adsorption tower 51, the second adsorption tower 52
Outlet side connects, and the other end is connected with 9 one end of check valve, 9 other end of check valve delay with product gas fill tank 10 be connected, product gas
It is slow to fill tank 10 and be also connected with product gas flow control valve 11；When the first product gas control valve 61 is opening, the second product
Gas control valve 62 is in off state；When the second product gas control valve 62 is opening, the first product gas control valve 61 is pass
Closed state；
First purge control valve 81,82 one end of the second purge control valve are connected with product gas surge tank respectively, the other end respectively with
The outlet side connection of first adsorption tower 51, the second adsorption tower 52；When the first purge control valve 81 is opening, the second cleaning
Control valve 82 is in off state；When the second purge control valve 82 is opening, the first purge control valve 81 is in off state.
The device used includes two groups of adsorbing mechanisms, and causes two groups of adsorbing mechanisms to be respectively at different working statuses,
When first group of adsorbing mechanism carries out boosting step, adsorption step, second group of adsorbing mechanism carries out depressurization desorption step, cleaning step
Suddenly；Then first group of adsorbing mechanism and second group of adsorbing mechanism respectively enter decompression pressure step and boosting and press step at the same time,
First group of adsorbing mechanism, which obtains being depressured, presses, and second group of adsorbing mechanism, which obtains boosting, presses；Then first group of adsorbing mechanism carries out
Depressurization desorption step, cleaning step；Second group of adsorbing mechanism carries out boosting step, adsorption step；Then first group of adsorbing mechanism
Respectively enteing boosting at the same time with second group of adsorbing mechanism presses step and decompression to press step, and first group of adsorbing mechanism is boosted
Press, second group of adsorbing mechanism, which obtains being depressured, presses；Adsorbing mechanism after boosting is pressed enters boosting step, is depressured the suction pressed
Random structure enters depressurization desorption step；Such cycle operation；
By taking the working method of first group of adsorbing mechanism as an example：Unstripped gas is compressed by compressor 1, delay through air inlet fill tank 2 and first into
Gas control valve 31 flows into the first adsorption tower 51, is boosting step；In adsorbent absorption unstripped gas in first adsorption tower 51
After strong absorbed component nitrogen, methane-rich gas is as product gas from the exhaust end of the first adsorption tower 51 through the first product gas control valve
61 flow out through check valve 9 enter product gas surge tank be adsorption step；；Terminate absorption step before adsorbent adsorption saturation
Suddenly；Close the first product gas control valve 61 after adsorption step, open the first Pressure and Control valve 71 to the first adsorption tower 51 into
Row is pressed, and is as depressured and is pressed step；The second Pressure and Control valve 72 is opened at the same time, is boosted and presses step, until first inhales
Attached 51 and second adsorption tower of tower, 52 pressure balance；After equal pressure drop, the residual gas of the first adsorption tower 51 is first adsorption tower 51
Exhaust gas is taken out true control valve 41 through first by vacuum pump 12 and is extracted out from the first adsorption tower 51, is depressurization desorption step；Decompression solution
Enter cleaning step after inhaling step, open the first purge control valve 81, product gas is controlled from product gas surge tank 10 through the first cleaning
The exhaust end of 81 and first adsorption tower 51 of valve processed flows into the first adsorption tower 51, and true control valve 41 is taken out from the first adsorption tower by first
51 inlet ends flow out, and the first adsorption tower 51 is cleaned；After cleaning step, close first and take out true control valve 41, first
Purge control valve 81, then the first adsorption tower 51 presses step into boosting, open the first Pressure and Control valve 71, while open the
Two Pressure and Control valves 72, the second adsorption tower 52 press step into decompression, until the first adsorption tower 51 and the second adsorption tower 52 are pressed
Dynamic balance；Then the first adsorption tower 51 enters boosting step, and the second adsorption tower 52 enters depressurization desorption step；So circulation.
The device of zeolite molecular sieve separation of methane and nitrogen can also include vacuum pump control valve 13, discharge bypass and bypass
Air bleeding valve 14；Vacuum pump control valve 13 is arranged on vacuum pump front end, and first takes out true 42 phase of control valve of the true pumping of control valve 41, second
Even；Discharge bypass is taken out between true control valve 41, second takes out true control valve 42 from vacuum pump control valve 13 and first and is drawn, bypass row
Air valve 14 is arranged in discharge bypass.Vacuum pump control valve 13, discharge bypass and By-pass vent valve 14 are set；So that solved in decompression
Step is inhaled can not also directly to be opened with vacuumizing and taken out true control valve and By-pass vent valve 14 by the way that the gas of adsorption tower is arranged
Go out so that adsorption column pressure reduces, so as to carry out depressurization desorption.
The circulation sequential of this flow is as shown in table 1.Tower one and tower two are respectively the first adsorption tower 51 and the second adsorption tower 52.
1 liang of tower circulation time-scale of table
Claims (6)
1. a kind of device based on HEU type zeolite molecular sieve separation of methane and nitrogen, it is characterized in that：Delay including compressor, air inlet
Fill tank, product gas is delayed and fills tank, vacuum pump, first group of adsorbing mechanism, second group of adsorbing mechanism；
First group of adsorbing mechanism includes the first air intake control valve, the true control valve of the first pumping, the first adsorption tower, the control of the first product gas
Valve, the first Pressure and Control valve, the first purge control valve；
Second group of adsorbing mechanism includes the second air intake control valve, the true control valve of the second pumping, the second adsorption tower, the control of the second product gas
Valve, the second Pressure and Control valve, the second purge control valve；
The air inlet, which is delayed, fills tank one end and is connected with compressor, and the other end passes through the first air intake control valve, the second air intake control valve point
It is not connected with the first adsorption tower, the second adsorption tower lower end, the first adsorption tower, the lower end of the second adsorption tower are respectively the first absorption
The inlet end of tower, the second adsorption tower；First adsorption tower, the inlet end of the second adsorption tower take out true control by first respectively
Valve, second take out true control valve and are connected with vacuum pump；When the first air intake control valve is opening, the second air intake control valve is pass
Closed state；When the second air intake control valve is opening, the first air intake control valve is in off state；When the first true control valve of pumping
For opening when, second, which takes out true control valve, is in off state；When it is opening that second, which takes out true control valve, first takes out true control
Valve processed is in off state；
The first Pressure and Control valve, the second Pressure and Control valve, one end are interconnected by same pipeline, and the other end is respectively with
The upper end connection of one adsorption tower, the second adsorption tower；First adsorption tower, the upper end of the second adsorption tower are respectively the first adsorption tower,
The outlet side of two adsorption towers；When the first Pressure and Control valve is in off state with the second Pressure and Control valve used time for unlatching or together；
The first product gas control valve, second product gas control valve one end respectively with the first adsorption tower, the second adsorption tower outlet
End connection, the other end fill tank and are connected with delaying with product gas；When the first product gas control valve is opening, the second product gas
Control valve is in off state；When the second product gas control valve is opening, the first product gas control valve is in off state；
First purge control valve, second purge control valve one end are connected with product gas surge tank respectively, the other end respectively with
The outlet side connection of first adsorption tower, the second adsorption tower；When the first purge control valve is opening, the second purge control valve
It is in off state；When the second purge control valve is opening, the first purge control valve is in off state.
2. the device according to claim 1 based on HEU type zeolite molecular sieve separation of methane and nitrogen, it is characterized in that：Institute
The device for stating zeolite molecular sieve separation of methane and nitrogen further includes check valve, and check valve, which is arranged on product gas and delays, fills tank and the first production
Between product gas control valve, the second product gas control valve.
3. the device according to claim 1 based on HEU type zeolite molecular sieve separation of methane and nitrogen, it is characterized in that：Institute
The device for stating zeolite molecular sieve separation of methane and nitrogen further includes product gas flow control valve, and product gas flow control valve is arranged on
Product gas delays the outlet side for filling tank.
4. the device according to claim 1 based on HEU type zeolite molecular sieve separation of methane and nitrogen, it is characterized in that：Institute
State adsorption tower and set at least to two.
5. the device according to claim 1 based on HEU type zeolite molecular sieve separation of methane and nitrogen, it is characterized in that：Institute
Partially dehydrated and carbon dioxide removal adsorbent can be added according to the demand of unstripped gas by stating absorption tower bottom.
6. the device according to claim 1 based on HEU type zeolite molecular sieve separation of methane and nitrogen, it is characterized in that：Institute
The device for stating zeolite molecular sieve separation of methane and nitrogen further includes vacuum pump control valve, discharge bypass and By-pass vent valve；Vacuum
Pump control valve is arranged on vacuum pump front end, takes out true control valve with first, the second true control valve of pumping is connected；Discharge bypass is from vacuum pump
Drawn between control valve and the true control valve of the first pumping, the second true control valve of pumping, By-pass vent valve is arranged in discharge bypass.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113355143A (en) * | 2021-07-22 | 2021-09-07 | 中石化石油工程技术服务有限公司 | Natural gas nitrogen and carbon dioxide removing method and device based on controllable-aperture molecular sieve |
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Application publication date: 20180515 |