CN107261755A - A kind of vacuum pressure swing adsorption system for oxygen production and its method for producing oxygen through with product gas transition tank - Google Patents
A kind of vacuum pressure swing adsorption system for oxygen production and its method for producing oxygen through with product gas transition tank Download PDFInfo
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- CN107261755A CN107261755A CN201710659126.3A CN201710659126A CN107261755A CN 107261755 A CN107261755 A CN 107261755A CN 201710659126 A CN201710659126 A CN 201710659126A CN 107261755 A CN107261755 A CN 107261755A
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- 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
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Abstract
The invention discloses a kind of vacuum pressure swing adsorption system for oxygen production with product gas transition tank, the present invention corresponds to each adsorption tower and sets corresponding product gas transition tank, adsorption tower adsorb every time production oxygen process output product gas sequentially through after product gas transition tank enter product gas surge tank, product gas leading portion high oxygen concentration part is used as oxygen generation system product gas into product gas surge tank, kept in product gas transition tank according to the oxygen concentration gradients of its output the dense part of back segment hypoxemia, corresponding adsorption tower is transferred to when vacuumizing flushing regeneration and product gas boosting, the dense product gas backflow adsorption tower of the temporary hypoxemia in the part is used as flushing regeneration gas and product gas boosting gas.It also discloses method for producing oxygen through.Effect of the present invention：Adsorbent service efficiency is improved, system oxygen recovery rate is improved, saves system energy consumption, system cost is reduced.
Description
Technical field
The present invention relates to PSA Gas Separation Technology, particularly a kind of Vacuum Pressure Swing with product gas transition tank is inhaled
Attached oxygen generation system 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.
When adsorbent progressivelyes reach adsorption saturation in adsorption tower, adsorption tower is in highest adsorptive pressure state, adsorption tower
Interior pressure is generally between 120 ~ 160kpa.A, and oxygen concentration gradients are in adsorption tower：Bottom of towe is that air oxygen concentration 21% is left
The right side is gradually transitions tower top 60 ~ 90%（Adsorb end prod oxygen concentration）.In order to improve adsorption efficiency and increase system production oxygen energy
Power, using the absorption end high pressure gas in adsorption tower after adsorption saturation as calming the anger, enters to be in system through switching valve and takes out
Another adsorption tower in vacuum latter stage is reclaimed, and forward reduces adsorption column pressure, and this process is to go out pressure reduction.
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.
Vacuum rinses regenerative process, in order to strengthen adsorbent reactivation, and the process has used storage in a small amount of product gas surge tank
The final products gas deposited is as flushing gas out of adsorption tower overhead reflux adsorption tower.Partial flushing gas quilt after adsorbent is rinsed
Vavuum pump is all taken away and drains into air, wastes high oxygen concentration product gas, reduces oxygen recovery rate.
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
Variation Features are spent, improve Application way, is realized and is reduced product oxygen loss, improves adsorbent utilization rate and system oxygen recovery
Rate；Using the partial pressure and vacuum energy in adsorption tower adsorption process, make the emptying of adsorption tower bottom self and self-priming air, drop
Low air blower and vavuum pump load, reduction system energy consumption, and realize that one kind of the continuous air feed of air blower has product gas mistake
Cross the vacuum pressure swing adsorption system for oxygen production and its method for producing oxygen through of tank.
The purpose of the present invention is achieved through the following technical solutions：A kind of Vacuum Pressure Swing Adsorption system with product gas transition tank
Oxygen system, 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 for keeping product gas turnover One-Dimensional flows
VS2B, product gas transition tank VS2C；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 respectively with
Adsorption tower A, adsorption tower B, adsorption tower C bottom connection；The port of export of the air blower AC is connected with inlet manifold P2, and air inlet is total
The pipe 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
Bottom of 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；It is described
Emptying house steward P3 arrival end be parallel with emptying switching valve V3A, emptying switching valve V3B and emptying switching valve V3C, emptying switching
Valve V3A, emptying switching valve V3B and emptying switching valve the V3C other end respectively with adsorption tower A, adsorption tower B, adsorption tower C bottom
Connection；Described vavuum pump VP arrival end is connected with vacuum manifold P4, and the vacuum manifold P4 other ends are parallel with vacuum switching valve
V4A, vacuum switching valve V4B and vacuum switching valve V4C, vacuum switching valve V4A, vacuum switching valve V4B and vacuum switching valve V4C's
Bottom of the other end respectively with adsorption tower A, adsorption tower B, adsorption tower C is connected；Described product surge tank VS1 arrival end connection
There is product gas main valve V8, the product gas main valve V8 other end is connected with product gas house steward P5, and the product gas house steward P5 other end is simultaneously
Product gas transition switching valve V7A, product gas transition switching valve V7B, product gas transition switching valve V7C are associated with, product gas transition is cut
Change 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 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 switching valve the V5C other end respectively with suction
Attached tower A, adsorption tower B, adsorption tower C top connection；The adsorption tower A, adsorption tower B, it is connected at the top of adsorption tower C
Press switching valve V6A, pressure switching valve V6B and press switching valve V6C, press switching valve V6A, pressure switching valve V6B and equal crush-cutting
The other end for changing valve V6C is interconnected.
Product gas transition tank includes tank body, the air distributor A being arranged in tank body, air distributor B and vertically divided
The bundle pipes of cloth, air distributor A is arranged between product gas transition tank entrance and bundle pipes, and air distributor B is arranged at production
Product gas transition tank is exported between bundle pipes, and described bundle pipes inner space is formed with gas channel A；Outside described bundle pipes
Gas channel B is formed between wall and inner tank wall；In described bundle pipes gas channel is formed between adjacent channel outer wall
C。
The method for producing oxygen through of the described vacuum pressure swing adsorption system for oxygen production with product gas transition tank, it includes following step
Suddenly：
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, after air blower AC boosts raw air, absorption is delivered to through air inlet switching valve V2A
Water, carbon dioxide and nitrogen in tower A, raw air are gradually adsorbed activated alumina, zeolite and the lithium of filling in tower A respectively
Based molecular sieve is adsorbed, and oxygen rich gas flows out as product gas from adsorption tower A tower tops and successively through product gas switching valve V5A, product
Gas transition tank VS2A, product gas transition switching valve V7A, product gas main valve V8 are flow in product surge tank VS1；
S2, adsorption tower A go out decompression：When the adsorbent loaded in adsorption tower A reaches adsorption saturation, air inlet switching valve is closed
V2A, air blower AC 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, open pressure switching valve V6A and press switching valve V6C, now adsorption tower C is in and vacuumizes latter stage, inhales
Absorption end high pressure gas in attached tower A is as calming the anger successively through pressing switching valve V6A, pressure switching valve V6C to enter in taking out
The adsorption tower C in vacuum latter stage, realization forward goes out to reduce adsorption tower A pressure, and reclaiming adsorption tower A with adsorption tower C adsorbs end height
Calm the anger；
S3, the emptying of adsorption tower A bottoms：2 ~ 4s before step S2 terminates, adsorption tower A pressure is still higher than environment atmospheric pressure, protects
Hold pressure switching valve V6A and press switching valve V6C openings, open emptying switching valve V3A, adsorption tower A bottom airs are through putting
Empty switching valve V3A is emptied from adsorption tower A bottoms；
S4, adsorption tower A are vacuumized：After step S3 terminates, adsorption tower A pressure closes emptying switching close to environment atmospheric pressure
Valve V3A, pressure switching valve V6A and pressure switching valve V6C, open vacuum switching valve V4A, vavuum pump VP is vacuumized to adsorption tower A,
Adsorption tower A pressure progressivelyes reach adsorbent vacuum regeneration pressure, and adsorbent water, carbon dioxide and nitrogen are gradually desorbed,
Adsorbent gradually regenerates；
S5, adsorption tower A product gas flushings：In 4 ~ 8s before step S4 terminates, vacuum switching valve V4A openings, vacuum are kept
Pump VP continues to vacuumize adsorption tower A, opens the product gas in product gas switching valve V5A, product gas transition tank VS2A through product
Gas switching valve V5A backflow adsorption tower A, adsorbent reactivation in product gas flushing, reinforcing adsorption tower A, whole punching are carried out to adsorption tower A
The pressure for washing journey adsorption tower A is held essentially constant；
S6, adsorption tower A enter to reclaim：After S5 steps terminate, and in 2 ~ 4s before step S4 terminates, vacuum switching valve is kept
V4A openings, vavuum pump VP continues to vacuumize adsorption tower A, closes product gas switching valve V5A, opens pressure switching valve V6A
Press switching valve V6B, now adsorption tower B is in absorption end, the absorption end high pressure gas in adsorption tower B as calm the anger according to
It is secondary through pressing switching valve V6B, pressure switching valve V6A to enter adsorption tower A, reclaim adsorption tower B absorption end high pressure gas, and use this
Portion gas displaces the dense waste gas of hypoxemia of adsorption tower A bottoms；
S7, the boosting of adsorption tower A first stage product gas：After step S6 terminates, close vacuum switching valve V4A, press switching valve
V6A and pressure switching valve V6B, the product gas opened in product gas switching valve V5A, product gas transition tank VS2A switch through product gas
Valve V5A backflow adsorption tower A, first stage product gas boosting is carried out to adsorption tower A；
S8, 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；
S9, 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 produces oxygen process product gas oxygen concentration Variation Features according to absorption, improves and utilizes
Method, increases raw air oxygen yield 5% or so on existing vacuum pressure swing adsorption system for oxygen production；By using adsorption tower overbottom pressure
State bottom is deflated, and reduces vavuum pump extraction flow, and system can be made to reduce energy consumption 5% or so；Pass through adsorption tower negative pressure state self-priming
Air and air blower circulation are continuous to adsorption tower air feed, and reduction air blower air feed flow is lost with emptying, and system can be made to reduce energy
Consumption 5% or so.Raw material air blower circulation simultaneously is continuous to improve the running stability of raw air air blower to adsorption tower air feed,
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 oxygen cycle timing diagram processed of the invention；
Fig. 5 is the system structure diagram of embodiment two；
In figure, the outlet of 1- product gas transition tank, 2- air distributors B, 3- tank body, 4- bundle pipes, 5- air distributors A, 6- production
Product gas transition tank entrance, 7- gas channels A, 8- gas channel B, 9- gas channel C.
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：
Embodiment one：As shown in figure 1, a kind of vacuum pressure swing adsorption system for oxygen production with product gas transition tank, it includes absorption
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 product gas transition tank VS2A, product gas transition tank VS2B, the product gas transition tank of One-Dimensional flows
VS2C。
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.
As shown in figure 1, being connected to pressure switching valve V6A, at the top of the adsorption tower A, adsorption tower B, adsorption tower C
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
It is interconnected.
As shown in Figure 1, Figure 2, Figure 3 shows, product gas transition tank include tank body 3, be arranged in tank body 3 air distributor A5,
Air distributor B2 and the bundle pipes 4 being vertically distributed, air distributor A5 are arranged at product gas transition tank entrance 6 and bundle pipes 4
Between, air distributor B2 is arranged between product gas transition tank outlet 1 and bundle pipes 4, the described inner space shape of bundle pipes 4
Into there is gas channel A7；Gas channel B8 is formed between the described outer wall of bundle pipes 4 and the inwall of tank body 3；Described bundle pipes 4
Gas channel C9 is formed between middle adjacent channel outer wall.
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, 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 ~ 4, the method for producing oxygen through of the described vacuum pressure swing adsorption system for oxygen production with product gas transition tank, it
Comprise the following steps：
（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, after air blower AC boosts raw air, through air inlet switching valve V2A continuous conveyings extremely
Adsorption tower A, continuously enters the water in adsorption tower A raw air（H2O）, carbon dioxide（CO2）And nitrogen（N2）Gradually respectively by
Water in adsorption tower A in the activated alumina of filling, zeolite and the absorption of lithium based molecular sieve, raw air（H2O）, carbon dioxide
（CO2）And nitrogen（N2）Built up in adsorption tower from the bottom of adsorbent to top layer up to adsorption saturation, continuously enter absorption
Oxygen in tower A raw air（O2）Turn into product gas from the outflow of adsorption tower A tower tops, due to whole absorption production oxygen process absorption
Adsorbent gradually adsorbs accumulation up to the process of adsorption saturation, therefore absorption produce oxygen process and flow out adsorption tower A's for one in tower A
The oxygen concentration of product gas is in the process gradually reduced from high to low.The oxygen rich gas that oxygen concentration changes in gradient as product gas from
Adsorption tower A tower tops flow out and successively through product gas switching valve V5A, product gas transition tank entrance 6, air distributor A5, into production
Gas channel A7, gas channel B8, gas channel C9 in product gas transition tank.Due to the gas set in product gas transition tank VS2A
Flow distributor A5, gas channel A7, gas channel B8, gas channel C9, air distributor B2 effect, into product gas transition
Tank VS2 interior air-flow passages A7, gas channel B8, gas channel C9 product gas can be in One-Dimensional flows in its gas channel, no
Leading portion gas residence and back segment gas mixing phenomenon can be produced, therefore enters gas channel A7, gas channel B8, gas channel C9
Product gas will necessarily keep its oxygen concentration gradient, from gas channel A7, gas channel B8, gas channel C9 through air distributor
B2, product gas transition tank outlet 1, product gas transition switching valve V7A, product gas main valve V8 enter product surge tank VS1, so that real
Now absorption production oxygen process leading portion high oxygen concentration product gas enters product gas surge tank VS1 as adsorption oxygen-preparation system end product gas,
And adsorb the gas channel that the production dense product gas of oxygen process back segment hypoxemia keeps its oxygen concentration gradient to reside in product gas transition tank VS1
A7, gas channel B8, in gas channel C9, it is used as the product gas flushing gas and product gas lift of adsorption tower A product gas rinsing steps
Press through the product gas boosting gas of journey.
S2, adsorption tower A go out decompression：When the adsorbent loaded in adsorption tower A reaches adsorption saturation, air inlet switching is closed
Valve V2A, air blower AC switch to adsorption tower B air inlets, close product gas switching valve V5A, product gas transition switching valve V7A, absorption
Tower A stops production product gas, opens pressure switching valve V6A and presses switching valve V6C, now adsorption tower C is in and vacuumizes latter stage,
Absorption end high pressure gas in adsorption tower A is as calming the anger successively through pressing switching valve V6A, pressure switching valve V6C to enter to be in
The adsorption tower C in latter stage is vacuumized, realization forward goes out to reduce adsorption tower A pressure, reclaiming adsorption tower A with adsorption tower C adsorbs end
High pressure gas.
S3, the emptying of adsorption tower A bottoms：2 ~ 4s before step S2 terminates, adsorption tower A pressure is still higher than ambient atmosphere pressure
Power, 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, to be vacuumized again
Raw continue to reduce pressure, adsorption tower A bottoms are higher than ambient atmosphere pressure part material air, if making it to adsorption tower A tower tops
Diffusion, the part material air is not but not the adsorbent in adsorbed bed adsorbs utilization, and in adsorption bed
Adsorbent is polluted, as in the invalid gas residence adsorption tower.Pressure switching valve V6A and pressure switching valve V6C is kept to open
State is opened, emptying switching valve V3A is opened, makes the part material air of adsorption tower A bottoms through being vented switching valve V3A directly from suction
Attached tower A bottoms emptying, adsorption tower A pressure is down to close to environment atmospheric pressure, while reducing vavuum pump extraction flow, is reduced
Oxygen generation system energy consumption.
S4, adsorption tower A are vacuumized：After step S3 terminates, adsorption tower A pressure closes emptying close to environment atmospheric pressure
Switching valve V3A, presses switching valve V6A and presses switching valve V6C, open vacuum switching valve V4A, vavuum pump VP takes out to adsorption tower A
Vacuum, 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 product gas flushings：In 4 ~ 8s before step S4 terminates, vacuum switching valve V4A openings are kept,
Vavuum pump VP continues to vacuumize adsorption tower A, unlatching product gas switching valve V5A, product gas transition tank VS2A interior air-flow passages A7,
The absorption production oxygen dense product gas of process hindfoot portion hypoxemia being resident in gas channel B8, gas channel C9 is rinsed as adsorption tower A
Gas flows back through inlet air flow distributor A5, product gas transition tank entrance 6, product gas switching valve V5A successively under the effect of its pressure
Into adsorption tower A.Due to the air distributor A5, gas channel A7, gas channel B8, the gas that are set in product gas transition tank VS2A
Circulation road C9 effect, outflow 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.The flushing gas
Backflow order be：Continuously adsorption tower A is rinsed from low oxygen concentration to high oxygen concentration according to oxygen concentration gradient.Adsorbed during flushing
Tower A, which is still carried out, to be vacuumized, and whole flushing process adsorption tower A pressure is held essentially constant, so as to realize with absorption production
Hyperoxia has been saved in minimum oxygen concentration part as adsorption tower A product gas flushing gas in oxygen process back segment low oxygen concentration product gas
Strength products gas, improves oxygen recovery rate.
S6, adsorption tower A enter to reclaim：After S5 steps terminate, and in 2 ~ 4s before step S4 terminates, vacuum switching is kept
Valve V4A openings, vavuum pump VP continues to vacuumize adsorption tower A, closes product gas switching valve V5A, and switching valve is pressed in unlatching
V6A and switching valve V6B is pressed, now adsorption tower B is in absorption end, the absorption end high pressure gas in adsorption tower B is as pressing
Gas through pressing switching valve V6B, pressure switching valve V6A to enter adsorption tower A, reclaims adsorption tower B absorption end high pressure gas successively, and
The dense waste gas of hypoxemia of adsorption tower A bottoms is displaced with the portion gas.
S7, the boosting of adsorption tower A first stage product gas：After step S6 terminates, vacuum switching valve V4A, equal crush-cutting are closed
Change valve V6A and press switching valve V6B, open product gas switching valve V5A, product gas transition tank VS2A interior air-flow passages A7, air-flow
The absorption production oxygen dense product gas of process back segment hypoxemia being resident in passage B8, gas channel C9 boosts gas in its pressure as adsorption tower A
Absorption is flowed back under power effect through inlet air flow distributor A5, product gas transition tank entrance 6, product gas switching valve V5A successively
Tower A.Due to the air distributor A5, gas channel A7, gas channel B8, the gas channel C9 that are set in product gas transition tank VS2A
Effect, outflow product gas transition tank VS2 interior air-flow passages A7, gas channel B8, gas channel C9 product gas can be in its gas
It is in One-Dimensional flows in circulation road, leading portion gas residence and back segment gas mixing phenomenon will not be produced.The backflow order of the boosting gas
For：From low oxygen concentration to high oxygen concentration according to oxygen concentration gradient continuous backflow adsorption tower A, first stage production is carried out to adsorption tower A
Product gas lift pressure.
S8, the boosting of adsorption tower A second stage product gas and adsorption tower A bottoms self-priming air：Remain in that product gas switches
Valve V5A openings, now adsorption tower A pressure still be below environment atmospheric pressure, open self-priming switching valve V1A, air pass through from
Inhale switching valve V1A self-primings and enter adsorption tower A bottoms, product gas is carried out to adsorption tower A and self-priming air boosts jointly, makes adsorption tower
A pressure is gradually increased to environment atmospheric pressure.
S9, the boosting of adsorption tower A phase IIIs product gas：When adsorption tower A pressure reaches environment atmospheric pressure, remain in that
Product gas switching valve V5A openings, close self-priming switching valve V1A, open product gas transition switching valve V7A, product surge tank
Product gas in VS1 exports 1, air distributor B2 through product gas transition switching valve V7A, product gas transition tank, is back to air-flow
Passage A7, gas channel B8, gas channel C9, gas channel A7, gas channel B8, remaining absorption production oxygen in gas channel C9
The dense product gas of process back segment 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 what is set in product gas transition tank VS2A
Air distributor A5, gas channel A7, gas channel B8, gas channel C9, air distributor B2 effect, effluent stream passage
A7, gas channel 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
Body is resident and back segment gas mixing phenomenon.The boosting gas backflow order be：From hypoxemia it is dense to high oxygen concentration according to oxygen concentration gradient
Continuous backflow adsorption tower A, phase III product gas boosting is carried out to adsorption tower A, until reaching adsorptive pressure, product gas has been boosted
Into so as to realize the product gas lift with the dense part of higher oxygen in the absorption production dense product gas of oxygen process back segment hypoxemia as adsorption tower A
Calm the anger, and keep boosting gas from hypoxemia it is dense to high oxygen concentration according to oxygen concentration gradient continuous backflow adsorption tower A so that realize backflow inhale
Attached tower A boosting gas is dense in continuously distributed from low to high from bottom of towe to tower top oxygen in adsorption tower A.High oxygen concentration product is saved
Gas, improves oxygen recovery 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 as corresponding adsorption tower product gas rinsing step product gas flushing gas and product gas boost process
Product gas boosting gas, vacuumized using vavuum pump VP, go out after decompression to adsorb tower bottom overbottom pressure voluntarily using adsorption tower
Emptying, adsorption tower bottom vacuum state self-priming air after being boosted using adsorption tower first stage product gas.
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.
Embodiment two：The present embodiment and the difference of embodiment one are：As shown in figure 5, product gas main valve V8 and product gas
Transition tank VS2A, product gas transition tank VS2B, at the top of product gas transition tank VS2C between do not have product gas transition switching valve V7A,
Product gas transition switching valve V7B, product gas transition switching valve V7C.
Claims (3)
1. a kind of vacuum pressure swing adsorption system for oxygen production with product gas transition tank, it is characterised in that：It includes adsorption tower A, inhaled
Attached 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 protecting
Hold product gas transition tank VS2A, product gas transition tank VS2B, product gas transition tank VS2C that product gas passes in and out One-Dimensional flows；It is described
The suction air house steward P1 port of export be parallel with self-priming switching valve V1A, self-priming switching valve V1B and self-priming switching valve V1C, self-priming is cut
Change valve V1A, the self-priming switching valve V1B and self-priming switching valve V1C other end respectively with adsorption tower A, adsorption tower B, adsorption tower C bottom
Portion is connected；The port of export of the air blower AC 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 air inlet switching valve V2C, air inlet switching valve V2A, air inlet switching valve V2B and air inlet switching valve V2C's
Bottom of the 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
It is vented switching valve V3A, emptying switching valve V3B and emptying switching valve V3C, emptying switching valve V3A, emptying switching valve V3B and emptying
Bottom of the switching valve V3C other end respectively with adsorption tower A, adsorption tower B, adsorption tower C is connected；Described vavuum pump VP entrance
End is connected with vacuum manifold P4, and the vacuum manifold P4 other ends are parallel with vacuum switching valve V4A, vacuum switching valve V4B and vacuum and cut
Change valve V4C, vacuum switching valve V4A, the vacuum switching valve V4B and vacuum switching valve V4C other end respectively with adsorption tower A, absorption
Tower B, adsorption tower C bottom connection；Described product surge tank VS1 arrival end is connected with product gas main valve V8, and product gas is total
The valve V8 other end is connected with product gas house steward P5, the product gas house steward P5 other end be 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 is connected, product gas transition tank VS2A, product gas transition tank VS2B, product gas transition tank VS2C import
It is connected to product gas switching valve V5A, product gas switching valve V5B and product gas switching valve V5C, product gas switching valve V5A, production
Product gas switching valve V5B and product gas switching valve the V5C other end at the top of adsorption tower A, adsorption tower B, adsorption tower C respectively with connecting
Connect；The adsorption tower A, adsorption tower B, pressure switching valve V6A, pressure switching valve V6B and is connected at the top of adsorption tower C
Switching valve V6C is pressed, presses switching valve V6A, pressure switching valve V6B and the pressure switching valve V6C other end to be interconnected.
2. a kind of vacuum pressure swing adsorption system for oxygen production with product gas transition tank according to claim 1, its feature exists
In：Product gas transition tank includes tank body, the air distributor A being arranged in tank body, air distributor B and the boundling being vertically distributed
Pipe, air distributor A is arranged between product gas transition tank entrance and bundle pipes, and air distributor B is arranged at product gas transition
Tank is exported between bundle pipes, and described bundle pipes inner space is formed with gas channel A；Described boundling pipe outer wall and tank body
Gas channel B is formed between inwall；Gas channel C is formed with described bundle pipes between adjacent channel outer wall.
3. the vacuum pressure swing adsorption system for oxygen production with product gas transition tank according to any one in claim 1 ~ 2
Method for producing oxygen through, it is characterised in that：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, after air blower AC boosts raw air, absorption is delivered to through air inlet switching valve V2A
Water, carbon dioxide and nitrogen in tower A, raw air are gradually adsorbed activated alumina, zeolite and the lithium of filling in tower A respectively
Based molecular sieve is adsorbed, and oxygen rich gas flows out as product gas from adsorption tower A tower tops and successively through product gas switching valve V5A, product
Gas transition tank VS2A, product gas transition switching valve V7A, product gas main valve V8 are flow in product surge tank VS1；
S2, adsorption tower A go out decompression：When the adsorbent loaded in adsorption tower A reaches adsorption saturation, air inlet switching valve is closed
V2A, air blower AC 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, open pressure switching valve V6A and press switching valve V6C, now adsorption tower C is in and vacuumizes latter stage, inhales
Absorption end high pressure gas in attached tower A is as calming the anger successively through pressing switching valve V6A, pressure switching valve V6C to enter in taking out
The adsorption tower C in vacuum latter stage, realization forward goes out to reduce adsorption tower A pressure, and reclaiming adsorption tower A with adsorption tower C adsorbs end height
Calm the anger；
S3, the emptying of adsorption tower A bottoms：2 ~ 4s before step S2 terminates, adsorption tower A pressure is still higher than environment atmospheric pressure, protects
Hold pressure switching valve V6A and press switching valve V6C openings, open emptying switching valve V3A, adsorption tower A bottom airs are through putting
Empty switching valve V3A is emptied from adsorption tower A bottoms；
S4, adsorption tower A are vacuumized：After step S3 terminates, adsorption tower A pressure closes emptying switching close to environment atmospheric pressure
Valve V3A, pressure switching valve V6A and pressure switching valve V6C, open vacuum switching valve V4A, vavuum pump VP is vacuumized to adsorption tower A,
Adsorption tower A pressure progressivelyes reach adsorbent vacuum regeneration pressure, and adsorbent water, carbon dioxide and nitrogen are gradually desorbed,
Adsorbent gradually regenerates；
S5, adsorption tower A product gas flushings：In 4 ~ 8s before step S4 terminates, vacuum switching valve V4A openings, vacuum are kept
Pump VP continues to vacuumize adsorption tower A, opens the product gas in product gas switching valve V5A, product gas transition tank VS2A through product
Gas switching valve V5A backflow adsorption tower A, adsorbent reactivation in product gas flushing, reinforcing adsorption tower A, whole punching are carried out to adsorption tower A
The pressure for washing journey adsorption tower A is held essentially constant；
S6, adsorption tower A enter to reclaim：After S5 steps terminate, and in 2 ~ 4s before step S4 terminates, vacuum switching valve is kept
V4A openings, vavuum pump VP continues to vacuumize adsorption tower A, closes product gas switching valve V5A, opens pressure switching valve V6A
Press switching valve V6B, now adsorption tower B is in absorption end, the absorption end high pressure gas in adsorption tower B as calm the anger according to
It is secondary through pressing switching valve V6B, pressure switching valve V6A to enter adsorption tower A, reclaim adsorption tower B absorption end high pressure gas, and use this
Portion gas displaces the dense waste gas of hypoxemia of adsorption tower A bottoms；
S7, the boosting of adsorption tower A first stage product gas：After step S6 terminates, close vacuum switching valve V4A, press switching valve
V6A and pressure switching valve V6B, the product gas opened in product gas switching valve V5A, product gas transition tank VS2A switch through product gas
Valve V5A backflow adsorption tower A, first stage product gas boosting is carried out to adsorption tower A；
S8, 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；
S9, 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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| CN110627022A (en) * | 2019-10-22 | 2019-12-31 | 湖南泰瑞医疗科技有限公司 | Three-tower oxygen generation system |
| CN113251699A (en) * | 2021-05-12 | 2021-08-13 | 成都绿建工程技术有限公司 | Heat recovery type heat pump oxygen-making air conditioning unit |
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| CN107261755B (en) | 2023-07-04 |
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