CN107200307A - A kind of three tower vacuum pressure swing adsorption system for oxygen production and its method for producing oxygen through - Google Patents
A kind of three tower vacuum pressure swing adsorption system for oxygen production and its method for producing oxygen through Download PDFInfo
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- CN107200307A CN107200307A CN201710659064.6A CN201710659064A CN107200307A CN 107200307 A CN107200307 A CN 107200307A CN 201710659064 A CN201710659064 A CN 201710659064A CN 107200307 A CN107200307 A CN 107200307A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/02—Preparation of oxygen
- C01B13/0229—Purification or separation processes
- C01B13/0248—Physical processing only
- C01B13/0259—Physical processing only by adsorption on solids
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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
- B01D53/0476—Vacuum 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
- B01D53/047—Pressure swing adsorption
- B01D53/053—Pressure swing adsorption with storage or buffer vessel
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/02—Preparation of oxygen
- C01B13/0229—Purification or separation processes
- C01B13/0248—Physical processing only
- C01B13/0259—Physical processing only by adsorption on solids
- C01B13/0262—Physical processing only by adsorption on solids characterised by the adsorbent
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- C01B2210/0014—Physical processing by adsorption in solids
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- C—CHEMISTRY; METALLURGY
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2210/00—Purification or separation of specific gases
- C01B2210/0001—Separation or purification processing
- C01B2210/0009—Physical processing
- C01B2210/0014—Physical processing by adsorption in solids
- C01B2210/0015—Physical processing by adsorption in solids characterised by the adsorbent
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Abstract
The invention discloses a kind of three towers vacuum pressure swing adsorption system for oxygen production, the present invention corresponds to each adsorption tower and sets corresponding product gas transition tank, the product gas leading portion high oxygen concentration part that adsorption tower adsorbs production oxygen process output every time enters product gas surge tank as oxygen generation system product gas, it is resident in product gas transition tank according to the oxygen concentration gradients of its output the dense part of back segment hypoxemia, when corresponding adsorption tower is transferred to product gas boosting step, product gas boosting gas backflow adsorption tower boosting is used as；The present invention also sets up an independent bundle pipes equalizer tank, adsorption tower goes out the oxygen concentration gradients gone out according to it of calming the anger that pressure reduction goes out and kept in bundle pipes equalizer tank, adsorption tower is transferred to when entering recycling step, is reclaimed as gas is entered, it also discloses method for producing oxygen through.Effect of the present invention：Product gas oxygen concentration, adsorbent service efficiency, system oxygen recovery rate, reduction air blower and vavuum pump load, reduction system energy consumption and investment are improved, the continuous air feed of air blower is realized.
Description
Technical field
The present invention relates to PSA Gas Separation Technology, particularly a kind of three towers vacuum pressure swing adsorption system for oxygen production and its
Method for producing oxygen through.
Background technology
Vacuum pressure swing adsorption system for oxygen production is using air blower boosting raw air and is sent to adsorption tower, utilizes suction
The different adsorbents loaded in attached tower are under high pressure to the water in raw air（H2O）, carbon dioxide（CO2）And nitrogen（N2）Enter
Row selective absorption, and oxygen not to be adsorbed（O2）The product gas produced as system；In adsorbent adsorption saturation, use
Vavuum pump vacuumizes decompression to adsorption tower, makes the water being adsorbed by adsorbent（H2O）, carbon dioxide（CO2）And nitrogen（N2）Solved
Inhale, adsorbent is regenerated, higher oxygen concentration is obtained using multitower circulation（60~93%）Oxygen rich air product.
Existing vacuum pressure swing adsorption system for oxygen production, is generally adsorbed by air blower, vavuum pump, switching valve, two identicals
Tower（A、B）, product gas surge tank, control device and pipeline etc. constitute.Absorption is gradually filled with adsorption tower from bottom to top
Water（H2O）Adsorbent（Such as activated alumina, silica gel, zeolite）, absorbing carbon dioxide（CO2）Adsorbent（Such as activated carbon, silicon
Glue, zeolite）And absorption nitrogen（N2）Adsorbent（Such as lithium based molecular sieve Li-X）.
In order that raw air is even into the uniform mass transfer absorption of adsorbent loaded in adsorption bed and bed and bed
In oxygen not to be adsorbed（O2）It is uniform to be flowed out from adsorption bed, generally in adsorption tower（A、B）Construction in, absorption tower bottom and
Top is equipped with gas distributor, and corresponding gas distributor occupies certain empty volume；Adsorbent is loaded in adsorption tower
There is certain empty volume during accumulation, between absorbent particles.
Raw air from air, after removing the solid particles such as dust through air cleaner, is risen into air blower
Pressure, the raw air after boosting is circulated feeding adsorption tower by switching valve respectively（A、B）, the water in raw air（H2O）, titanium dioxide
Carbon（CO2）And nitrogen（N2）In adsorption tower（A、B）It is interior gradually to be adsorbed by corresponding adsorbent, the oxygen in raw air（O2）Make
It is non-adsorbed component from adsorption tower（A、B）Tower top flows out, and enters product gas surge tank through switching valve, the product produced as system
Gas, this process is absorption production oxygen process.
Existing vacuum pressure swing adsorption system for oxygen production, in order to improve adsorption efficiency and increase system production oxygen ability, will inhale
Absorption end high pressure gas after attached tower adsorption saturation in adsorption tower is entered as calming the anger using the adsorption tower for vacuumizing end to it
Row enters to reclaim, and is recycled to calming the anger for the adsorption tower that vacuumizes end, wherein a small amount of take row away as rinsing gas by vavuum pump
To air, remaining retained mostly as displacement gas in tower is reclaimed, and displaces the dense waste gas of hypoxemia for vacuumizing tower bottom, specifically
Implement generally to use following 3 kinds of methods：
（1）, product gas flushing regeneration+ push back receiving method：When adsorption tower B vacuumizes the preceding 2 ~ 6s of end, a small amount of product gas is used
In surge tank or the product gas of adsorption tower A outputs carries out in 2 ~ 3s back flush, reinforcing adsorption tower B adsorbent again to adsorption tower B
It is raw, and the dense waste gas of part hypoxemia of adsorption tower B bottoms is displaced, adsorption tower B pressure is held essentially constant, and this process is product gas
Rinse regenerative process；Adsorption tower A is in adsorption saturation state at the end of adsorption tower B back flush, now passes through air inlet switching valve
Adsorption tower A air blower air intakes are closed, being vented switching valve by air blower makes air blower be in emptying state（Now adsorption tower B is still
So state is vacuumized in vavuum pump）, by pressing switching valve directly to be connected with adsorption tower B tops at the top of adsorption tower A, adsorb
Tower A is pressed to adsorption tower B, sharp using the absorption end high pressure gas in adsorption tower after adsorption tower A adsorption saturations as calming the anger
It is entered to reclaim with the adsorption tower B of end is vacuumized, calming the anger for the adsorption tower B that vacuumizes end is recycled to, wherein
A small amount of taken away as flushing gas by vavuum pump drains into air, remaining to retain adsorption tower B recovery mostly as displacement gas, and replaces
Go out the dense waste gas of hypoxemia of adsorption tower B bottoms, this process is to press removal process.
（2）, calm the anger flushing regeneration recovery method：When adsorption tower B vacuumizes the preceding 2 ~ 6s of end, adsorption tower A, which is in, to be inhaled
Attached saturation state, now closes adsorption tower A air blower air intakes by air inlet switching valve, and being vented switching valve by air blower makes air blast
Machine is in emptying state（Now adsorption tower B is still within vavuum pump and vacuumizes state）, by pressing switching valve to push up adsorption tower A
Portion is directly connected with adsorption tower B tops, and adsorption tower A is pressed to adsorption tower B, by adsorption tower after adsorption tower A adsorption saturations
Absorption end high pressure gas as calming the anger, it is entered to reclaim using the adsorption tower B of end is vacuumized, is recycled to and takes out true
The adsorption tower B's of empty tip calms the anger, wherein a small amount of drain into air as rinsing gas and taken away by vavuum pump, it is remaining mostly as
Displacement gas is retained adsorption tower B and reclaimed, and displaces the dense waste gas of hypoxemia of adsorption tower B bottoms, and this process is flushing regeneration of calming the anger
Removal process.
（3）, disclose a kind of vacuum pressure swing adsorption system for oxygen production and its control in Chinese patent CN201310007058.4
Method：Increase by the first and second two equalizer tanks, in adsorption tower A adsorption saturations, pass through air inlet switching valve and close adsorption tower A drums
Blower fan air intake, being vented switching valve by air blower makes air blower be in emptying state（Now adsorption tower B is still within vacuum pumping
Vacuum state）.First passing through pressure switching valve will directly connect at the top of adsorption tower A with the first equalizer tank, by adsorption tower A adsorption saturations
The leading portion high oxygen concentration part that the part is calmed the anger forward is put into by the absorption end high pressure gas in adsorption tower as calming the anger afterwards
Temporarily deposited in one equalizer tank；Then again by pressing switching valve directly to be connected with the second equalizer tank at the top of adsorption tower A, the portion
The dense part of the back segment hypoxemia calmed the anger is divided to continue forward to be put into the second equalizer tank temporarily to deposit.Adsorption tower A vacuumizes latter stage, leads to
Crossing pressure switching valve will directly connect at the top of adsorption tower A with the second equalizer tank, is forward put into the second equalizer tank with adsorption tower A
Temporary calm the anger (the dense part of back segment hypoxemia of calming the anger) carries out back flush to adsorption tower A, and end suction is vacuumized while displacing
The dense waste gas of hypoxemia of attached tower A bottoms, adsorption tower B is vacuumized after end, by pressing switching valve will be equal with first at the top of adsorption tower B
Pressure tank is directly connected, and be forward put into adsorption tower A in the first equalizer tank temporary calms the anger (leading portion high oxygen concentration part of calming the anger)
Adsorption tower B is boosted, realized to the absorption end high pressure gas high oxygen concentration part in adsorption tower after adsorption tower A adsorption saturations
Reclaim, this process is to press removal process.
Adsorption tower goes out after decompression, and adsorption tower is vacuumized with vavuum pump, continues to reduce in adsorption column pressure, adsorbent and inhales
Attached water（H2O）, carbon dioxide（CO2）And nitrogen（N2）Gradually desorb, air is drained into by vacuum pumped through switching valve, adsorb
Agent gradually regenerates, and this process is vacuum regeneration process.
The middle and later periods is vacuumized in adsorption tower, in order to strengthen adsorbent reactivation, with the production stored in a small amount of product gas surge tank
Product gas is rinsed through switching valve out of adsorption tower overhead reflux adsorption tower to adsorbent, adsorbent is obtained thorough regeneration, this
Process is that vacuum rinses regenerative process.
Absorption end high pressure gas in another adsorption tower that adsorption tower vacuumizes in absorption end in latter stage, system
As calming the anger, the adsorption tower is entered through switching valve, the part is reclaimed and calms the anger, and is calmed the anger with the part and displaces adsorption tower
The dense waste gas of hypoxemia of bottom, this process is to enter removal process.
By entering the adsorption tower of removal process, Cheng Qian is crossed being transferred to absorption production oxygen, in addition it is also necessary to in product gas surge tank
The product gas of storage carries out product gas boosting from adsorption tower overhead reflux adsorption tower through switching valve to adsorption tower, works as adsorption column pressure
When rising to absorption production oxygen pressure, adsorption tower can just be transferred to absorption production oxygen process, and this process is product gas boost process.
In a word, each adsorption tower in vacuum pressure swing adsorption system for oxygen production can be through in an oxygen generation system oxygen cycle
Go through procedure below：Raw air absorption production oxygen --- goes out decompression --- to vacuumize regeneration and --- enter to reclaim --- product gas lift
Press five technical process, the continuous misphase step operation of multitower.Under Controlled by Programmable Controller, realized certainly by switching valve system
Dynamic circular flow.
Existing vacuum pressure swing adsorption system for oxygen production has the following disadvantages：
Absorption production oxygen process, terminates since the adsorbent adsorption saturation in air feed to adsorption tower raw material air blower is to adsorption tower,
The raw air that whole absorption production oxygen process air blower is continuously sent into after pressurization from adsorption tower bottom of towe to adsorption tower.Continuously enter suction
Water in the raw air of attached tower（H2O）, carbon dioxide（CO2）And nitrogen（N2）Adsorbent in adsorbed tower is gradually adsorbed, and
Built up from the bottom of adsorbent to top layer up to adsorption saturation, continuously enter the oxygen in the raw air of adsorption tower（O2）
Turn into product gas from the outflow of adsorption tower tower top, be directly entered product gas surge tank, make in product gas surge tank after buffer reservoir
Used for the final products air lift supply subsequent user that vacuum pressure swing adsorption system for oxygen production is produced.Due to the absorption of whole adsorption process
Adsorbent gradually adsorbs accumulation up to the process of adsorption saturation for one in tower, therefore flows out the oxygen concentration of the product gas of adsorption tower
In the process gradually reduced from high to low, the product gas oxygen ranges of the process are generally by whole vacuum pressure swing adsorption system
The final products gas oxygen concentration of system output determines, i.e. the high oxygen concentration product gas at absorption production oxygen initial stage and absorption production oxygen latter stage absorption
Agent is mixed to get the production of average oxygen concentration close to low oxygen concentration product gas during saturation in product gas surge tank during buffer reservoir
Product gas, the mixed average oxygen concentration product gas turns into the final products gas that whole vacuum pressure swing adsorption system for oxygen production is produced,
Reduce final products gas oxygen concentration.
Product gas flushing regeneration+ push back receiving method：Due to having used portioned product gas in regenerative process adsorption tower
Adsorbent is rinsed, and makes the adsorbent reactivation in adsorption tower more thorough, the dense waste gas discharge of hypoxemia of regenerative adsorption tower bottom
It is more abundant.But the overwhelming majority is rinsed gas and can taken away by vavuum pump, have lost the portioned product gas of flushing, not only makes vacuum
The increase of pump load, the energy expenditure increase of system, and device gas production is accordingly reduced.
Flushing of calming the anger regenerates recovery method：During adsorption tower A adsorption saturations, in adsorption tower A pressure be generally in 120 ~
Between 160kpa.A, and oxygen concentration gradients are in adsorption tower A：Bottom of towe is that air oxygen concentration 21% or so is gradually transitions tower top
60~90%（Adsorb end prod oxygen concentration）.Now, adsorption tower B is just approaching or at vacuumizing end, adsorption tower B internal pressures
Power is generally between 40 ~ 60kpa.A, and oxygen concentration gradients are in adsorption tower B：Bottom of towe be 8 ~ 11% be gradually transitions tower top 60 ~
90%（Adsorb end prod oxygen concentration）.Because absorption tower bottom and top are equipped with gas distributor, and occupy certain vacant
Volume；When adsorbent loads accumulation in adsorption tower, there is certain empty volume between absorbent particles.At the top of adsorption tower A with
When connection is pressed at the top of adsorption tower B（Now adsorption tower A has stopped air intake and adsorption tower B also is continuing to vacuumize）, from
The oxygen concentration oxygen concentration gradients of calming the anger that adsorption tower A goes out to flow into adsorption tower B are：60~90%（Adsorb end gas oxygen concentration）
To air oxygen concentration 21% or so, i.e., the oxygen concentration at initial stage of calming the anger for going out adsorption tower A is 60 ~ 90%（Adsorb end prod oxygen
Concentration）, latter stage oxygen concentration is 21% or so, and the oxygen concentration at initial stage of calming the anger for accordingly flowing into adsorption tower B is 60 ~ 90%（Absorption end
Hold product oxygen concentration）, latter stage oxygen concentration is 21% or so.This pressure equalizing produce result be necessarily：What is be recovered calms the anger
High oxygen concentration, which is partially filled in, will carry out the absorption tower bottom of next absorption, and the low oxygen concentration part of calming the anger being recovered is filled out
Fill at the top of the adsorption tower that will carry out next absorption.It is unfavorable for adsorption operations, reduction adsorption efficiency and oxygen recovery rate.
Chinese patent CN201310007058.4 is disclosed in a kind of vacuum pressure swing adsorption system for oxygen production and its control method, right
The shortcoming of existing procedure has been fully described, and its solution provided is：Increase by the first and second two equalizer tanks, inhaling
During attached tower A adsorption saturations, adsorption tower A air blower air intakes are closed by air inlet switching valve, being vented switching valve by air blower makes drum
Blower fan is in emptying state（Now adsorption tower B is still within vavuum pump and vacuumizes state）.First passing through pressure switching valve will adsorb
Directly connected with the first equalizer tank at the top of tower A, using the absorption end high pressure gas in adsorption tower after adsorption tower A adsorption saturations as equal
Calm the anger, and the leading portion high oxygen concentration part that the part is calmed the anger forward is put into the first equalizer tank temporarily deposited；Then pass through again
Pressure switching valve will directly be connected at the top of adsorption tower A with the second equalizer tank, and the dense part of the back segment hypoxemia that the part is calmed the anger is continued
Forward it is put into the second equalizer tank and temporarily deposits.Adsorption tower A vacuumizes latter stage, by press switching valve by the top of adsorption tower A with
Second equalizer tank is directly connected, and be forward put into adsorption tower A in the second equalizer tank temporary calms the anger that (back segment hypoxemia of calming the anger is dense
Part) back flush is carried out to adsorption tower A, while displacing the dense waste gas of hypoxemia for vacuumizing end-attachment tower A bottoms, adsorption tower
B is vacuumized after end, by pressing switching valve directly to be connected with the first equalizer tank at the top of adsorption tower B, is forward put with adsorption tower A
Temporary calm the anger (the leading portion high oxygen concentration part of calming the anger) entered in the first equalizer tank is boosted to adsorption tower B, is realized to absorption
The recovery of absorption end high pressure gas high oxygen concentration part after tower A adsorption saturations in adsorption tower.This method essence is will to calm the anger point
Used into two parts, leading portion high oxygen concentration part of calming the anger be introduced into first calm the anger tank keep in, back segment low oxygen concentration of calming the anger
Part enters back into the second tank of calming the anger and kept in, and the temporary back segment low oxygen concentration part of calming the anger of tank that second is calmed the anger is used for again
The flushing regeneration of raw adsorption tower, and the temporary leading portion high oxygen concentration part of calming the anger of tank that first is calmed the anger be used for regenerate after suction
The boosting gas of attached tower is reclaimed.Although this method has certain technological progress, but still exists following not enough：（1）Back segment is low
Oxygen concentration part is calmed the anger after being mixed into average oxygen concentration in the second equalizer tank, and the adsorption tower in regeneration is rushed
Displacement is washed, the oxygen concentration of the flushing gas stayed in adsorption tower can be in be evenly distributed；（2）Calm the anger together leading portion high oxygen concentration part
Sample can calm the anger in-tank mixing into the recovery of the adsorption tower after regeneration after average oxygen concentration, is refilled first, be recovered to again
The oxygen concentration in adsorption tower after life is equally in be evenly distributed.Still it is unfavorable for adsorption operations, adsorption efficiency can not fully be sent out
Wave, oxygen recovery rate improves limited.
Product gas boost process, same process has used the final products gas of storage in product gas surge tank as product
Gas lift is calmed the anger out of adsorption tower overhead reflux adsorption tower, will not be wasted although the portioned product gas lift is calmed the anger, in adsorption tower
Interior is in the dense distribution of averaged oxygen, is unfavorable for adsorption operations, adsorption efficiency can not give full play to, and reduce oxygen recovery rate.
In existing vacuum pressure swing adsorption system for oxygen production, it goes out pressure reduction, can make the absorption in absorption end
The high pressure feedstock air for the empty volume memory storage that the empty volume and corresponding pipeline that tower bottom gas distributor occupies are occupied exists
Go out at the top of the adsorption tower when calming the anger, into the adsorption bed of the adsorption tower, and now the adsorption bed is in and was depressured
Journey, the water into the raw air of the adsorption bed（H2O）, carbon dioxide（CO2）And nitrogen（N2）, bed will not be adsorbed
In adsorbent adsorbed, as in the invalid gas residence adsorption tower, its pressure energy is wasted, and treats that the adsorption tower is transferred to and takes out
During vacuum state, the portion gas can be taken away after extended volume by vavuum pump under vacuum conditions.Not only add oxygen generation system
The energy expenditure of vavuum pump, is also polluted to the adsorbent in adsorption bed.
In existing vacuum pressure swing adsorption system for oxygen production, adsorption tower is after entering removal process, and adsorption column pressure is still
Less than environment atmospheric pressure, Cheng Qian is crossed being transferred to absorption production oxygen, it can only be boosted with product gas, its vacuum energy fails
It is utilized effectively, adds system energy consumption.
In existing vacuum pressure swing adsorption system for oxygen production, due in the presence of going out decompression and entering removal process, necessarily making
Raw air air blower in an absorption regeneration cyclic process, exist pass twice through air blower emptying switching valve be vented,
The running stability of raw air air blower is not only reduced, the energy expenditure of oxygen generation system is also add, emptying is generated and makes an uproar
Sound.
The content of the invention
It is an object of the invention to overcome the shortcoming of prior art dense according to absorption production oxygen process product gas oxygen there is provided one kind
Degree, pressure equalizing are calmed the anger oxygen concentration Variation Features, improve Application way, are realized and are reduced product oxygen loss, improve adsorbent
Utilization rate and system oxygen recovery rate；Using the partial pressure and vacuum energy in adsorption tower adsorption process, make absorption tower bottom
Voluntarily emptying and self-priming air, reduce air blower and vavuum pump load, reduction system energy consumption, and realize that air blower is continuously supplied
A kind of three towers vacuum pressure swing adsorption system for oxygen production and its method for producing oxygen through of wind.
The purpose of the present invention is achieved through the following technical solutions：A kind of three tower vacuum pressure swing adsorption system for oxygen production, it includes
Adsorption tower A, adsorption tower B, adsorption tower C, suction air house steward P1, emptying house steward P3, air blower AC, vavuum pump VP, product surge tank
VS1 and product gas transition tank VS2A, product gas transition tank VS2B, product gas transition for keeping product gas turnover One-Dimensional flows
Tank VS2C, the bundle pipes equalizer tank VS3 of One-Dimensional flows is passed in and out for keeping calming the anger；The described port of export for inhaling air house steward P1
It is parallel with self-priming switching valve V1A, self-priming switching valve V1B and self-priming switching valve V1C, self-priming switching valve V1A, self-priming switching valve V1B
Bottom with the self-priming switching valve V1C other end respectively with adsorption tower A, adsorption tower B, adsorption tower C is connected；The air blower AC's
The port of export is connected with inlet manifold P2, and inlet manifold's P2 other ends are parallel with air inlet switching valve V2A, air inlet switching valve V2B and entered
Gas switching valve V2C, air inlet switching valve V2A, air inlet switching valve V2B and air inlet switching valve the V2C other end respectively with adsorption tower A,
Adsorption tower B, adsorption tower C bottom connection；Described emptying house steward P3 arrival end is parallel with emptying switching valve V3A, emptying and cut
Change valve V3B and emptying switching valve V3C, emptying switching valve V3A, emptying switching valve V3B and emptying switching valve V3C other end difference
It is connected with adsorption tower A, adsorption tower B, adsorption tower C bottom；Described vavuum pump VP arrival end is connected with vacuum manifold P4, very
The empty house steward P4 other ends are parallel with vacuum switching valve V4A, vacuum switching valve V4B and vacuum switching valve V4C, vacuum switching valve V4A,
Bottom of vacuum switching valve V4B and vacuum switching valve the V4C other end respectively with adsorption tower A, adsorption tower B, adsorption tower C is connected；
Described product surge tank VS1 arrival end is connected with product gas main valve V8, and the product gas main valve V8 other end is connected with product
Gas house steward P5, product gas house steward the P5 other end are parallel with product gas transition switching valve V7A, product gas transition switching valve V7B, production
Product gas transition switching valve V7C, product gas transition switching valve V7A, product gas transition switching valve V7B, product gas transition switching valve V7C
Outlet of the other end respectively with product gas transition tank VS2A, product gas transition tank VS2B, product gas transition tank VS2C be connected, produce
Product gas transition tank VS2A, product gas transition tank VS2B, product gas transition tank VS2C import are connected to product gas switching valve
V5A, product gas switching valve V5B and product gas switching valve V5C, product gas switching valve V5A, product gas switching valve V5B and product gas
Top of the switching valve V5C other end respectively with adsorption tower A, adsorption tower B, adsorption tower C is connected；Described bundle pipes equalizer tank
It is connected with the top of VS3 and enters switching valve V10, the other end for entering switching valve V10 is connected with the house steward P6 that calms the anger, calms the anger total
The pipe P6 other end is parallel with pressure switching valve V6A, pressure switching valve V6B and presses switching valve V6C, presses switching valve V6A,
Pressure switching valve V6B and top of the pressure switching valve V6C other end respectively with adsorption tower A, adsorption tower B and adsorption tower C are connected；Institute
It is also associated with going out switching valve V11 at the top of the bundle pipes equalizer tank VS3 stated, goes out the switching valve V11 other end with calming the anger
House steward P6 connections.
Product gas transition tank includes tank body A, the air distributor A being arranged in tank body A, air distributor B and vertically divided
The bundle pipes A of cloth, air distributor A are arranged between product gas transition tank entrance and bundle pipes A, and air distributor B is arranged at
Product gas transition tank is exported between bundle pipes A, and described bundle pipes A inner spaces are formed with gas channel A；Described boundling
Gas channel B is formed between pipe A outer walls and tank body A inwalls；In described bundle pipes A gas is formed between adjacent channel outer wall
Circulation road C.
Described bundle pipes equalizer tank VS3 includes tank body B, the turnover air distributor C being arranged in tank body B and vertical point
The bundle pipes B of cloth, turnover air distributor C is arranged at the top of tank body B and at bundle pipes B entrance ends, described boundling
Pipe B inner spaces are formed with gas channel D；Gas channel E is formed between described bundle pipes B outer walls and tank body B inwalls；Institute
In the bundle pipes B stated gas channel F is formed between adjacent channel outer wall.
Described goes out switching valve V11 for regulating valve.
A kind of method for producing oxygen through of three towers vacuum pressure swing adsorption system for oxygen production, it comprises the following steps：
S1, air blower AC enter raw air to adsorption tower A, and adsorption tower A goes out product gas：Open air inlet switching valve V2A, product autogenous cutting
Change valve V5A, product gas transition switching valve V7A and product gas main valve V8, close self-priming switching valve V1A, emptying switching valve V3A, true
Empty switching valve V4A, pressure switching valve V6A, enter switching valve V10, go out switching valve V11, air blower AC boosts raw air
Afterwards, water, carbon dioxide and the nitrogen being delivered to through air inlet switching valve V2A in adsorption tower A, raw air are gradually adsorbed tower respectively
The activated alumina of filling, zeolite and the absorption of lithium based molecular sieve in A, oxygen rich gas flow out as product gas from adsorption tower A tower tops
And flow to successively through product gas switching valve V5A, product gas transition tank VS2A, product gas transition switching valve V7A, product gas main valve V8
In product surge tank VS1；
S2, adsorption tower A and bundle pipes equalizer tank VS3 are pressed：When the adsorbent loaded in adsorption tower A reaches adsorption saturation, close
Close air inlet switching valve V2A, air blower AC and switch to adsorption tower B air inlets, close product gas switching valve V5A and product gas transition switching
Valve V7A, adsorption tower A stop production product gas, open pressure switching valve V6A and enter the absorption in switching valve V10, adsorption tower A
End high pressure gas enters in bundle pipes equalizer tank VS3 through pressing switching valve V6A, entering switching valve V10 successively as calming the anger, real
Now forward go out to reduce adsorption tower A pressure, and adsorption tower A absorption end high pressure gas is temporarily stored into bundle pipes equalizer tank VS3；
S3, the emptying of adsorption tower A bottoms：After step S2 terminates, adsorption tower A pressure is still higher than environment atmospheric pressure, closes equal
Pressure switching valve V6A and enter switching valve V10, open emptying switching valve V3A, adsorption tower A bottom airs through emptying switching valve V3A from
Adsorption tower A bottoms are emptied；
S4, adsorption tower A are vacuumized：After step S3 terminates, adsorption tower A pressure closes emptying switching close to environment atmospheric pressure
Valve V3A, opens vacuum switching valve V4A, and vavuum pump VP is vacuumized to adsorption tower A, and adsorption tower A pressure progressivelyes reach adsorbent vacuum
Regeneration pressure, adsorbent water, carbon dioxide and nitrogen desorption, adsorbent is regenerated；
S5, adsorption tower A enter to reclaim：In 2 ~ 4s before step S4 terminates, unlatching goes out switching valve V11, presses switching valve V6A,
That is kept in bundle pipes equalizer tank VS3 calms the anger under the effect of its pressure successively through going out switching valve V11, pressure switching valve V6A
Adsorption tower A is flowed back into, the absorption end high pressure gas in bundle pipes equalizer tank VS3 is temporarily stored into the S2 steps for reclaiming adsorption tower B,
And the dense waste gas of hypoxemia of adsorption tower A bottoms is displaced with the portion gas, enter adsorption tower A when reclaiming and still carry out to vacuumize；
S6, the boosting of adsorption tower A first stage product gas：After step S5 terminates, close vacuum switching valve V4A, press switching valve
V6A and go out switching valve V11, the product gas opened in product gas switching valve V5A, product gas transition tank VS2A switches through product gas
Valve V5A backflow adsorption tower A, first stage product gas boosting is carried out to adsorption tower A；
S7, the boosting of adsorption tower A second stage product gas and adsorption tower A bottoms self-priming air：Remain in that product gas switching valve V5A
Opening, now adsorption tower A pressure still be below environment atmospheric pressure, open self-priming switching valve V1A, air switches through self-priming
Valve V1A self-primings enter adsorption tower A bottoms, adsorption tower A pressure is gradually increased to environment atmospheric pressure；
S8, the boosting of adsorption tower A phase IIIs product gas：When adsorption tower A pressure reaches environment atmospheric pressure, product is remained in that
Gas switching valve V5A openings, close self-priming switching valve V1A, open in product gas transition switching valve V7A, product surge tank VS1
Product gas through the product gas in product gas transition switching valve V7A return products gas transition tank VS2A, product gas transition tank VS2A
Through product gas switching valve V5A backflow adsorption tower A, proceed boosting to adsorption tower A, until reaching adsorptive pressure, product gas lift
Pressure is completed.
Invention has advantages below：The present invention calms the anger oxygen according to absorption production oxygen process product gas oxygen concentration, pressure equalizing
Change in concentration feature, improves Application way, increases raw air oxygen yield 8% on existing vacuum pressure swing adsorption system for oxygen production left
It is right；Deflated by using adsorption tower overbottom pressure state bottom, reduce vavuum pump extraction flow, system can be made to reduce energy consumption 5% or so；
It is continuous to adsorption tower air feed by adsorption tower negative pressure state air self-suction and air blower circulation, reduce air blower air feed flow and put
Sky loss, can make system reduce energy consumption 5% or so.Raw material air blower circulation simultaneously is continuous to adsorption tower air feed, improves raw material empty
The running stability of enraged blower fan, it is to avoid emptying noise.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is product gas transition tank structural representation of the invention；
Fig. 3 is Fig. 2 A-A sectional views；
Fig. 4 is bundle pipes equalizer tank VS3 structural representations of the invention；
Fig. 5 is Fig. 4 A-A sectional views；
Fig. 6 is oxygen cycle timing diagram processed of the invention；
In figure, the outlet of 1- product gas transition tank, 2- air distributors B, 3- tank body A, 4- bundle pipes A, 5- air distributor A, 6-
Product gas transition tank entrance, 7- gas channels A, 8- gas channel B, 9- gas channel C, 10- tank body B, 11- air distributor C,
12- bundle pipes B, 13- gas channel D, 14- gas channel E, 15- gas channel F.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings, and protection scope of the present invention is not limited to as described below：
As shown in figure 1, a kind of three towers vacuum pressure swing adsorption system for oxygen production, it includes adsorption tower A, adsorption tower B, adsorption tower C, suction greatly
Gas house steward P1, emptying house steward P3, air blower AC, vavuum pump VP, product surge tank VS1 and for keeping product gas to pass in and out one dimensional flow
Dynamic product gas transition tank VS2A, product gas transition tank VS2B, product gas transition tank VS2C, it is one-dimensional for the turnover that keeps calming the anger
The bundle pipes equalizer tank VS3 of flowing.
As shown in figure 1, the described suction air house steward P1 port of export is parallel with self-priming switching valve V1A, self-priming switching valve V1B
With self-priming switching valve V1C, self-priming switching valve V1A, the self-priming switching valve V1B and self-priming switching valve V1C other end respectively with absorption
Tower A, adsorption tower B, adsorption tower C bottom connection.
As shown in figure 1, the port of export of the air blower AC is connected with inlet manifold P2, inlet manifold's P2 other ends are parallel with
Air inlet switching valve V2A, air inlet switching valve V2B and air inlet switching valve V2C, air inlet switching valve V2A, air inlet switching valve V2B and air inlet
Bottom of the switching valve V2C other end respectively with adsorption tower A, adsorption tower B, adsorption tower C is connected.
As shown in figure 1, described emptying house steward P3 arrival end be parallel with emptying switching valve V3A, emptying switching valve V3B and
Be vented switching valve V3C, emptying switching valve V3A, the emptying switching valve V3B and emptying switching valve V3C other end respectively with adsorption tower
A, adsorption tower B, adsorption tower C bottom connection.
As shown in figure 1, described vavuum pump VP arrival end is connected with vacuum manifold P4, the vacuum manifold P4 other ends are in parallel
There are vacuum switching valve V4A, vacuum switching valve V4B and a vacuum switching valve V4C, vacuum switching valve V4A, vacuum switching valve V4B and true
Bottom of the empty switching valve V4C other end respectively with adsorption tower A, adsorption tower B, adsorption tower C is connected.
As shown in figure 1, described product surge tank VS1 arrival end is connected with product gas main valve V8, product gas main valve V8
The other end be connected with product gas house steward P5, the product gas house steward P5 other end is parallel with product gas transition switching valve V7A, product
Gas transition switching valve V7B, product gas transition switching valve V7C, product gas transition switching valve V7A, product gas transition switching valve V7B,
The product gas transition switching valve V7C other end respectively with product gas transition tank VS2A, product gas transition tank VS2B, product gas transition
Tank VS2C is connected, and product gas transition tank VS2A, product gas transition tank VS2B, the product gas transition tank VS2C other end are connected respectively
There are product gas switching valve V5A, product gas switching valve V5B and product gas switching valve V5C, product gas switching valve V5A, product gas switching
Top of valve V5B and product gas switching valve the V5C other end respectively with adsorption tower A, adsorption tower B, adsorption tower C is connected.
Enter switching valve V10 as shown in figure 1, being connected with the top of described bundle pipes equalizer tank VS3, enter switching valve V10
The other end be connected with the calm the anger house steward P6 other ends of the house steward P6 that calms the anger and be parallel with pressure switching valve V6A, press switching valve
V6B and press switching valve V6C, press switching valve V6A, pressure switching valve V6B and the pressure switching valve V6C other end respectively with suction
Attached tower A, adsorption tower B and adsorption tower C top connection.
As shown in figure 1, being also associated with going out switching valve V11 at the top of described bundle pipes equalizer tank VS3, go out switching valve
V11 other end connection is connected with the house steward P6 that calms the anger.
As shown in Fig. 1 ~ 3, product gas transition tank includes tank body A3, air distributor A5, the air-flow being arranged in tank body A3
Distributor B2 and the bundle pipes A4 being vertically distributed, air distributor A5 be arranged at product gas transition tank entrance 6 and bundle pipes A4 it
Between, air distributor B2 is arranged between 1 and bundle pipes A4 of product gas transition tank outlet, described bundle pipes A4 inner spaces shape
Into there is gas channel A7；Gas channel B8 is formed between described bundle pipes A4 outer walls and tank body A3 inwalls；Described boundling
Gas channel C9 is formed with pipe A4 between adjacent channel outer wall.
As shown in Figure 1, Figure 4, Figure 5, described bundle pipes equalizer tank VS3 includes tank body B10, is arranged in tank body B10
The turnover air distributor C11 and bundle pipes B12 being vertically distributed, turnover air distributor C11 is arranged at the top of tank body B10 and position
At bundle pipes B12 entrance ends, described bundle pipes B12 inner spaces are formed with gas channel D13；Described bundle pipes
Gas channel E14 is formed between B12 outer walls and tank body B10 inwalls；Shape between adjacent channel outer wall in described bundle pipes B12
Into there is gas channel F15.
As shown in figure 1, described adsorption tower A, adsorption tower B, adsorption tower C bottoms are connected to for adsorption tower overbottom pressure shape
Emptying switching valve V3A, V3B, V3C of state bottom emptying.
As shown in figure 1, described adsorption tower A, adsorption tower B, adsorption tower C bottoms are connected to for adsorption tower negative pressure shape
Self-priming switching valve V1A, V1B, V1C of state bottom air self-suction.
As shown in figure 1, described go out switching valve V11 for regulating valve, gas is calmed the anger and rinses for adjust adsorption tower
Flow, pressure parameter.
As shown in figure 1, the suction nitrogen loaded in described adsorption tower A, adsorption tower B, adsorption tower C（N2）Molecular sieve is efficient
Li-X type lithium based molecular sieves.
As shown in Fig. 1 ~ 6, a kind of method for producing oxygen through of described three towers vacuum pressure swing adsorption system for oxygen production, it includes following step
Suddenly：
（One）The job step of adsorption tower A single columns is as follows：
S1, air blower AC enter raw air to adsorption tower A, and adsorption tower A goes out product gas：Open air inlet switching valve V2A, product autogenous cutting
Change valve V5A, product gas transition switching valve V7A and product gas main valve V8, close self-priming switching valve V1A, emptying switching valve V3A, true
Empty switching valve V4A, pressure switching valve V6A, enter switching valve V10, go out switching valve V11, air blower AC boosts raw air
Afterwards, through air inlet switching valve V2A continuous conveyings to adsorption tower A, the water in adsorption tower A raw air is continuously entered（H2O）, dioxy
Change carbon（CO2）And nitrogen（N2）The activated alumina of filling in tower A, zeolite and the absorption of lithium based molecular sieve are gradually adsorbed respectively, it is former
Expect the water in air（H2O）, carbon dioxide（CO2）And nitrogen（N2）Gradually tire out from the bottom of adsorbent to top layer in adsorption tower
Product is until adsorption saturation, continuously enters the oxygen in adsorption tower A raw air（O2）Turn into product from the outflow of adsorption tower A tower tops
Gas, the process accumulated up to adsorption saturation is gradually adsorbed due to entirely adsorbing adsorbent in production oxygen process adsorption tower A for one, because
The oxygen concentration of this absorption production oxygen process outflow adsorption tower A product gas is in the process gradually reduced from high to low.Oxygen concentration is in ladder
The oxygen rich gas for spending change flows out as product gas from adsorption tower A tower tops and successively through product gas switching valve V5A, product gas transition
Tank entrance 6, air distributor A5, into the gas channel A7 in product gas transition tank, gas channel B8, gas channel C9.By
In the air distributor A5 set in product gas transition tank VS2A, gas channel A7, gas channel B8, gas channel C9, air-flow
Distributor B2 effect, into product gas transition tank VS2 interior air-flow passages A7, gas channel B8, gas channel C9 product gas
It can be in One-Dimensional flows in its gas channel, leading portion gas residence and back segment gas mixing phenomenon will not be produced, therefore enter gas
Circulation road A7, gas channel B8, gas channel C9 product gas will necessarily keep its oxygen concentration gradient, from gas channel A7, gas
Circulation road B8, gas channel C9 are through air distributor B2, product gas transition tank outlet 1, product gas transition switching valve V7A, product
Gas main valve V8 enters product surge tank VS1, so as to realize that absorption production oxygen process leading portion high oxygen concentration product gas is buffered into product gas
Tank VS1 adsorbs the production dense product gas of oxygen process back segment hypoxemia and keeps its oxygen concentration ladder as adsorption oxygen-preparation system end product gas
Degree is resided in product gas transition tank VS1 gas channel A7, gas channel B8, gas channel C9, is used as adsorption tower A product gas
The product gas boosting gas of boost process；
S2, adsorption tower A and bundle pipes equalizer tank VS3 are pressed；When the adsorbent loaded in adsorption tower A reaches adsorption saturation, close
Close air inlet switching valve V2A, air blower AC and switch to adsorption tower B air inlets, close product gas switching valve V5A, product gas transition switching
Valve V7A, adsorption tower A stop production product gas, and now adsorption tower A is in absorption end state, and adsorption tower A pressure adsorbs for highest
Pressure, empty volume shared by gas distributor, empty volume in corresponding pipeline at the top and bottom of adsorption tower A, absorbent particles it
Between the gases at high pressure oxygen concentration gradients of empty volume memory storage be：Bottom of towe is that air oxygen concentration 21% or so is gradually transitions tower
Top 60 ~ 90%（Adsorb end prod oxygen concentration）.Open pressure switching valve V6A and enter the suction in switching valve V10, adsorption tower A
Attached end high pressure gas is as calming the anger under the effect of its pressure successively through pressing switching valve V6A, entering switching valve V10, enter outlet
Flow distributor C11 enters gas channel D13, gas channel E14, in gas channel F15, and the elution order of calming the anger is：From height
Dense calm the anger to dense calm the anger of hypoxemia of oxygen flows continually out according to oxygen concentration gradient, and realization forward goes out to reduce adsorption tower A pressure, and
Adsorption tower A absorption end high pressure gas is temporarily stored into gas channel D13, gas channel E14, gas in bundle pipes equalizer tank VS3
In circulation road F15.Due to the turnover air distributor C11 and gas channel D13, gas channel that are set in bundle pipes equalizer tank
E14, gas channel F15 effect, into bundle pipes equalizer tank VS3 interior air-flow passages D13, gas channel E14, gas channel
Calming the anger for F15 can be in One-Dimensional flows in its gas channel, will not produce leading portion gas residence and back segment gas mixing phenomenon,
Therefore its oxygen concentration gradient will necessarily be kept into gas channel D13, gas channel E14, calming the anger for gas channel F15,
Bundle pipes equalizer tank VS3 gas channel D13, gas channel E14, gas channel F15 is continuously kept in（Adsorption tower A goes out to collection
That keeps in beam tube equalizer tank VS3 calms the anger, in latter oxygen generation system oxygen cycle, is used as adsorption tower C S5 processes
Enter to reclaim gas）；
S3, the emptying of adsorption tower A bottoms：After step S2 terminates, adsorption tower A pressure is still higher than environment atmospheric pressure, about 110
~ 115kpa.A, adsorption tower A are still within reducing press process, and Xia Yi Walk sequence adsorption towers A, which will be transferred to, vacuumizes regeneration continuation reduction
Pressure, the vacant body that the empty volume and adsorption tower A bottom inlet corresponding pipelines that adsorption tower A bottom gas distributors occupy are occupied
That accumulates memory storage is higher than ambient atmosphere pressure part material air, if making it be spread to adsorption tower A tower tops, the part material air
Not but not the adsorbent in adsorbed bed adsorbs utilization, and the adsorbent in adsorption bed is polluted, turned into
In the invalid gas residence adsorption tower.Now close pressure switching valve V6A and enter switching valve V10, open emptying switching valve
V3A, makes the part material air of adsorption tower A bottoms directly be emptied through being vented switching valve V3A from adsorption tower A bottoms, will adsorb
Tower A pressure is down to close to environment atmospheric pressure, while reducing vavuum pump extraction flow, reduces oxygen generation system energy consumption；
S4, adsorption tower A are vacuumized：After step S3 terminates, adsorption tower A pressure closes emptying switching close to environment atmospheric pressure
Valve V3A, opens vacuum switching valve V4A, and vavuum pump VP is vacuumized to adsorption tower A, and adsorption tower A pressure progressivelyes reach adsorbent vacuum
Regeneration pressure, makes adsorbent water（H2O）, carbon dioxide（CO2）And nitrogen（N2）Desorption, adsorbent is regenerated；
S5, adsorption tower A enter to reclaim：In 2 ~ 4s before step S4 terminates, unlatching goes out switching valve V11, presses switching valve V6A,
Bundle pipes equalizer tank VS3 interior air-flow passages D13, gas channel E14, gas channel F15 are temporary to calm the anger（Calm the anger the part
Come from previous oxygen generation system oxygen cycle, i.e., adsorption tower B S2 processes go out logical to bundle pipes equalizer tank VS3 interior air-flows
Road D13, gas channel E14, gas channel F15 are temporary to calm the anger）Successively through passing in and out air distributor under the effect of its pressure
C11, go out switching valve V11, pressure switching valve V6A flow back into adsorption tower A, this calm the anger backflow order be：It is dense from hypoxemia
Calm the anger to high oxygen concentration and calm the anger according to oxygen concentration gradient continuous backflow.Due to the turnover air-flow set in bundle pipes equalizer tank VS3
Gas in distributor C11 and gas channel D13, gas channel E14, gas channel F15 effect, outflow bundle pipes equalizer tank VS3
Circulation road D13, gas channel E14, calming the anger for gas channel F15 can be in One-Dimensional flows in its gas channel, will not produce
Leading portion gas residence and back segment gas mixing phenomenon, therefore effluent stream passage D13, gas channel E14, gas channel F15
Calming the anger will necessarily keep its oxygen concentration gradient to continuously enter in adsorption tower A, the low oxygen concentration that bundle pipes equalizer tank VS3 first goes out
Part, which is calmed the anger, is introduced into adsorption tower A as gas is rinsed, and is taken away by vavuum pump, the high oxygen concentration gone out after bundle pipes equalizer tank VS3
Degree part enters adsorption tower A as displacement gas after calming the anger, retain in adsorption tower A and reclaim, and partially recycled the calming the anger is being inhaled
It is dense in continuously distributed from low to high from bottom of towe to tower top oxygen in attached tower A；
In this S5 Walk sequence, by being controlled regulation to the aperture for going out switching valve V11, adsorption tower A inversely can be entered back
Flow of calming the anger, the pressure parameter of receipts process are adjusted, while realizing to the adsorption tower A in S2 Walk sequences and bundle pipes equalizer tank
Flow of calming the anger, the pressure parameter of VS3 pressure equalizings are adjusted；
S6, the boosting of adsorption tower A first stage product gas：After step S5 terminates, close vacuum switching valve V4A, press switching valve
V6A, opens product gas switching valve V5A, product gas transition tank VS2A interior air-flow passages A7, gas channel B8, in gas channel C9
The resident absorption production oxygen dense product gas of process back segment hypoxemia as adsorption tower A boost gas under the effect of its pressure successively through entering implication
Flow distributor A5, product gas transition tank entrance 6, product gas switching valve V5A flow back into adsorption tower A.Due to product gas transition tank
The air distributor A5 of setting, gas channel A7, gas channel B8, gas channel C9 effect in VS2A, flow out product gas mistake
It can be in One-Dimensional flows in its gas channel to cross tank VS2 interior air-flow passages A7, gas channel B8, gas channel C9 product gas,
Leading portion gas residence and back segment gas mixing phenomenon will not be produced.The boosting gas backflow order be：From low oxygen concentration to hyperoxia
Concentration carries out first stage product gas boosting according to oxygen concentration gradient continuous backflow adsorption tower A to adsorption tower A；
S7, the boosting of adsorption tower A second stage product gas and adsorption tower A bottoms self-priming air：Remain in that product gas switching valve V5A
Opening, now adsorption tower A pressure still be below environment atmospheric pressure, open self-priming switching valve V1A, air switches through self-priming
Valve V1A self-primings enter adsorption tower A bottoms, carry out product gas to adsorption tower A and self-priming air boosts jointly, make adsorption tower A pressure
It is gradually increased to environment atmospheric pressure；
S8, the boosting of adsorption tower A phase IIIs product gas：When adsorption tower A pressure reaches environment atmospheric pressure, product is remained in that
Gas switching valve V5A openings, close self-priming switching valve V1A, open in product gas transition switching valve V7A, product surge tank VS1
Product gas through product gas transition switching valve V7A, product gas transition tank outlet 1, air distributor B2 be back to gas channel A7,
Gas channel B8, gas channel C9, gas channel A7, gas channel B8, in gas channel C9 after remaining absorption production oxygen process
The section dense product gas of hypoxemia is under the promotion of product surge tank VS1 return product gas, successively through air distributor A5, product gas transition
Tank entrance 6, product gas switching valve V5A all flow back into adsorption tower A.Due to the air-flow point set in product gas transition tank VS2A
Cloth device A5, gas channel A7, gas channel B8, gas channel C9, air distributor B2 effect, effluent stream passage A7, gas
Circulation road B8, the remaining product gas of gas channel C9 can be in One-Dimensional flows in its gas channel, will not produce leading portion gas and stay
Stay and back segment gas mixing phenomenon.The boosting gas backflow order be：It is dense continuous according to oxygen concentration gradient to high oxygen concentration from hypoxemia
Flowed back adsorption tower A, and phase III product gas boosting is carried out to adsorption tower A, until reaching adsorptive pressure, product gas boosting is completed,
So as to realize the product gas boosting gas with the absorption production oxygen dense product gas of process back segment hypoxemia as adsorption tower A, and keep the gas that boosts
From hypoxemia it is dense to high oxygen concentration according to oxygen concentration gradient continuous backflow adsorption tower A, so as to realize that backflow adsorption tower A boosting gas is being inhaled
It is dense in continuously distributed from low to high from bottom of towe to tower top oxygen in attached tower A.High oxygen concentration product gas has been saved, oxygen recovery is improved
Rate.
（Two）Oxygen generation system oxygen cycle job step：
As shown in figure 4, the single column work of the adsorption tower B, adsorption tower C operation principle and single column job step with adsorption tower A
Make step identical, be all to carry out raw air air feed absorption aerogenesis using air blower AC, using product gas transition tank VS2B,
The back segment low oxygen concentration product gas that product gas transition tank VS2C adsorbs production oxygen process to corresponding adsorption tower respectively is resident, and will
The resident portioned product gas utilizes bundle pipes equalizer tank as the product gas boosting gas of corresponding adsorption tower product gas boost process
VS2, which is forward gone out decompression and inversely enters to reclaim, to calm the anger, and is vacuumized, is gone out using adsorption tower using vavuum pump VP
Adsorb tower bottom overbottom pressure after decompression to be voluntarily vented, adsorption tower bottom vacuum state after boosting using adsorption tower first stage product gas
Self-priming air.
As shown in figure 4, the continuous misorientation step operation of described adsorption tower A, adsorption tower B, adsorption tower C, realizes oxygen generation system
Circulation work continuously produces oxygen.
As shown in figure 4, air blower AC is respectively to adsorption tower A, adsorption tower B, the continuous misorientation step air feeds of adsorption tower C.
As shown in figure 4, vavuum pump VP is vacuumized to adsorption tower A, adsorption tower B, the continuous misorientation steps of adsorption tower C respectively.
Claims (5)
1. a kind of three towers vacuum pressure swing adsorption system for oxygen production, it is characterised in that：It include adsorption tower A, adsorption tower B, adsorption tower C,
Inhale air house steward P1, emptying house steward P3, air blower AC, vavuum pump VP, product surge tank VS1 and for keeping product gas to pass in and out one
The product gas transition tank VS2A, product gas transition tank VS2B, product gas transition tank VS2C of flowing are tieed up, for keeping turnover of calming the anger
The bundle pipes equalizer tank VS3 of One-Dimensional flows；The described suction air house steward P1 port of export is parallel with self-priming switching valve V1A, self-priming
Switching valve V1B and self-priming switching valve V1C, self-priming switching valve V1A, self-priming switching valve V1B and self-priming switching valve the V1C other end point
Bottom not with adsorption tower A, adsorption tower B, adsorption tower C is connected；The port of export of the air blower AC is connected with inlet manifold P2, enters
Gas house steward's P2 other ends are parallel with air inlet switching valve V2A, air inlet switching valve V2B and air inlet switching valve V2C, air inlet switching valve V2A,
Bottom of air inlet switching valve V2B and air inlet switching valve the V2C other end respectively with adsorption tower A, adsorption tower B, adsorption tower C is connected；
Described emptying house steward P3 arrival end is parallel with emptying switching valve V3A, emptying switching valve V3B and emptying switching valve V3C, emptying
Switching valve V3A, the emptying switching valve V3B and emptying switching valve V3C other end respectively with adsorption tower A, adsorption tower B, adsorption tower C
Bottom is connected；Described vavuum pump VP arrival end is connected with vacuum manifold P4, and the vacuum manifold P4 other ends are parallel with vacuum and cut
Change valve V4A, vacuum switching valve V4B and vacuum switching valve V4C, vacuum switching valve V4A, vacuum switching valve V4B and vacuum switching valve
Bottom of the V4C other end respectively with adsorption tower A, adsorption tower B, adsorption tower C is connected；Described product surge tank VS1 entrance
End is connected with product gas main valve V8, and the product gas main valve V8 other end is connected with product gas house steward P5, and product gas house steward P5's is another
One end is parallel with product gas transition switching valve V7A, product gas transition switching valve V7B, product gas transition switching valve V7C, product gas
Transition switching valve V7A, product gas transition switching valve V7B, product gas transition switching valve V7C the other end respectively with product gas transition
Tank VS2A, product gas transition tank VS2B, product gas transition tank VS2C outlet are connected, product gas transition tank VS2A, product gas mistake
Cross tank VS2B, product gas transition tank VS2C import and be connected to product gas switching valve V5A, product gas switching valve V5B and production
Product gas switching valve V5C, product gas switching valve V5A, product gas switching valve V5B and product gas switching valve the V5C other end respectively with
Adsorption tower A, adsorption tower B, adsorption tower C top connection；It is connected with the top of described bundle pipes equalizer tank VS3 and enters switching valve
V10, the other end for entering switching valve V10 is connected with the house steward P6 that calms the anger, and the other end for the house steward P6 that calms the anger is parallel with equal crush-cutting
Change valve V6A, pressure switching valve V6B and press switching valve V6C, press switching valve V6A, pressure switching valve V6B and press switching valve
Top of the V6C other end respectively with adsorption tower A, adsorption tower B and adsorption tower C is connected；Described bundle pipes equalizer tank VS3 top
Portion is also associated with going out switching valve V11, goes out the switching valve V11 other end and is connected with the house steward P6 that calms the anger.
2. a kind of three towers vacuum pressure swing adsorption system for oxygen production according to claim 1, it is characterised in that：Product gas transition tank
Including tank body A, the air distributor A being arranged in tank body A, air distributor B and the bundle pipes A being vertically distributed, air flow method
Device A is arranged between product gas transition tank entrance and bundle pipes A, and air distributor B is arranged at the outlet of product gas transition tank and collected
Between beam tube A, described bundle pipes A inner spaces are formed with gas channel A；Described bundle pipes A outer walls and tank body A inwalls it
Between be formed with gas channel B；In described bundle pipes A gas channel C is formed between adjacent channel outer wall.
3. a kind of three towers vacuum pressure swing adsorption system for oxygen production according to claim 1, it is characterised in that：Described bundle pipes
Equalizer tank VS3 includes tank body B, the turnover air distributor C being arranged in tank body B and the bundle pipes B being vertically distributed, and passes in and out air-flow
Distributor C is arranged at the top of tank body B and at bundle pipes B entrance ends, and described bundle pipes B inner spaces are formed with air-flow
Passage D；Gas channel E is formed between described bundle pipes B outer walls and tank body B inwalls；Adjacent channel in described bundle pipes B
Gas channel F is formed between outer wall.
4. a kind of three towers vacuum pressure swing adsorption system for oxygen production according to claim 1, it is characterised in that：Described goes out to cut
Valve V11 is changed for regulating valve.
5. the method for producing oxygen through of three tower vacuum pressure swing adsorption system for oxygen production, its feature according to any one in claim 1 ~ 4
It is：It comprises the following steps：
S1, air blower AC enter raw air to adsorption tower A, and adsorption tower A goes out product gas：Open air inlet switching valve V2A, product autogenous cutting
Change valve V5A, product gas transition switching valve V7A and product gas main valve V8, close self-priming switching valve V1A, emptying switching valve V3A, true
Empty switching valve V4A, pressure switching valve V6A, enter switching valve V10, go out switching valve V11, air blower AC boosts raw air
Afterwards, water, carbon dioxide and the nitrogen being delivered to through air inlet switching valve V2A in adsorption tower A, raw air are gradually adsorbed tower respectively
The activated alumina of filling, zeolite and the absorption of lithium based molecular sieve in A, oxygen rich gas flow out as product gas from adsorption tower A tower tops
And flow to successively through product gas switching valve V5A, product gas transition tank VS2A, product gas transition switching valve V7A, product gas main valve V8
In product surge tank VS1；
S2, adsorption tower A and bundle pipes equalizer tank VS3 are pressed：When the adsorbent loaded in adsorption tower A reaches adsorption saturation, close
Close air inlet switching valve V2A, air blower AC and switch to adsorption tower B air inlets, close product gas switching valve V5A and product gas transition switching
Valve V7A, adsorption tower A stop production product gas, open pressure switching valve V6A and enter the absorption in switching valve V10, adsorption tower A
End high pressure gas enters in bundle pipes equalizer tank VS3 through pressing switching valve V6A, entering switching valve V10 successively as calming the anger, real
Now forward go out to reduce adsorption tower A pressure, and adsorption tower A absorption end high pressure gas is temporarily stored into bundle pipes equalizer tank VS3；
S3, the emptying of adsorption tower A bottoms：After step S2 terminates, adsorption tower A pressure is still higher than environment atmospheric pressure, closes equal
Pressure switching valve V6A and enter switching valve V10, open emptying switching valve V3A, adsorption tower A bottom airs through emptying switching valve V3A from
Adsorption tower A bottoms are emptied；
S4, adsorption tower A are vacuumized：After step S3 terminates, adsorption tower A pressure closes emptying switching close to environment atmospheric pressure
Valve V3A, opens vacuum switching valve V4A, and vavuum pump VP is vacuumized to adsorption tower A, and adsorption tower A pressure progressivelyes reach adsorbent vacuum
Regeneration pressure, adsorbent water, carbon dioxide and nitrogen desorption, adsorbent is regenerated；
S5, adsorption tower A enter to reclaim：In 2 ~ 4s before step S4 terminates, unlatching goes out switching valve V11, presses switching valve V6A,
That is kept in bundle pipes equalizer tank VS3 calms the anger under the effect of its pressure successively through going out switching valve V11, pressure switching valve V6A
Adsorption tower A is flowed back into, the absorption end high pressure gas in bundle pipes equalizer tank VS3 is temporarily stored into the S2 steps for reclaiming adsorption tower B,
And the dense waste gas of hypoxemia of adsorption tower A bottoms is displaced with the portion gas, enter adsorption tower A when reclaiming and still carry out to vacuumize；
S6, the boosting of adsorption tower A first stage product gas：After step S5 terminates, close vacuum switching valve V4A, press switching valve
V6A and go out switching valve V11, the product gas opened in product gas switching valve V5A, product gas transition tank VS2A switches through product gas
Valve V5A backflow adsorption tower A, first stage product gas boosting is carried out to adsorption tower A；
S7, the boosting of adsorption tower A second stage product gas and adsorption tower A bottoms self-priming air：Remain in that product gas switching valve V5A
Opening, now adsorption tower A pressure still be below environment atmospheric pressure, open self-priming switching valve V1A, air switches through self-priming
Valve V1A self-primings enter adsorption tower A bottoms, adsorption tower A pressure is gradually increased to environment atmospheric pressure；
S8, the boosting of adsorption tower A phase IIIs product gas：When adsorption tower A pressure reaches environment atmospheric pressure, product is remained in that
Gas switching valve V5A openings, close self-priming switching valve V1A, open in product gas transition switching valve V7A, product surge tank VS1
Product gas through the product gas in product gas transition switching valve V7A return products gas transition tank VS2A, product gas transition tank VS2A
Through product gas switching valve V5A backflow adsorption tower A, proceed boosting to adsorption tower A, until reaching adsorptive pressure, product gas lift
Pressure is completed.
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