CN1583220A - Pressure swing adsorption process for adsorbing separated multiple component from multicomponent mixed gas - Google Patents
Pressure swing adsorption process for adsorbing separated multiple component from multicomponent mixed gas Download PDFInfo
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- CN1583220A CN1583220A CN 03135616 CN03135616A CN1583220A CN 1583220 A CN1583220 A CN 1583220A CN 03135616 CN03135616 CN 03135616 CN 03135616 A CN03135616 A CN 03135616A CN 1583220 A CN1583220 A CN 1583220A
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Abstract
A variable-pressure adsorption process for separating major component from multi-element gas mixture by adsorption is disclosed. Each adsorber performs such steps as adsorption, pressure balance (lowering pressure), vacuum desorption, and pressure balance (raising up ressure). In the adsorber, there is a reverse conic barrel to divide the adsorbent into two parts. The raw gas mixture flows upward through the space outside said reverse conic barrel and then downward through the barrel. The resultant gas is outptted from the bottom of adsorber.
Description
The invention belongs to chemical process and manufacturing field of equipment.
Need the gaseous mixture of a large amount of components of absorption being widely used in recent years with pressure swing adsorption method (calling the PSA method in the following text) separating binary and above the containing of binary, except from air, producing oxygen, also applicable to from formaldehyde tail gas, extracting hydrogen or from the natural gas that contains great amount of carbon dioxide, removing in the system such as carbon dioxide.Be that example is launched narration of the present invention from air, to produce oxygen below.
From air, produce oxygen, become the main alternative method of Deep Cooling Method, at 5000Nm
3When needing 93% oxygen below the/h, the PSA method is enough to compete with Deep Cooling Method.Because the PSA method is produced the technological progress of oxygen, its investment and energy consumption reduce gradually.The oxygen of its production has been widely used in fields such as metallurgy, glass furnace, sewage disposal.
The process that PSA legal system commonly used is got oxygen is an example with two towers, and as shown in Figure 1, each absorber need be through absorption (A), pressure balance (step-down ED), desorb of finding time (VC) and pressure balance steps such as (ER boost).The pressure swing adsorption technique order is shown in Fig. 2 tabulation.With the A tower is example, and compressed air enters absorber from absorber A bottom, and by the suction-operated of adsorbent, product oxygen is sent by the absorber top.After absorption phase finishes, close A tower terminal valve 1A, 3A, open valve 4, residual gas among the absorber A is carried out pressure balance (absorber A step-down) with the absorber B that has found time, valve-off 4 then, open valve 2A absorber A is found time (this moment, the B tower adsorbed), find time to finish, carry out pressure balance (absorber A boosts) to absorber A by the absorber B that stops to adsorb.After pressure balance was intact, absorber A entered absorption again.
Absorber in the existing flow process generally is more satisfactory vertical vessel.But pressure swing adsorption method is produced oxygen, need absorption to fall a large amount of nitrogen (nitrogenous in the air is 79% by volume), for the long-pending absorber of uiform section, along with the carrying out of absorption, gas is too big by the change in flow of absorber.As produce the oxygen device of 93% purity, and the oxygen yield gets 50%, and then by the gas flow rate of absorber, absorption ends (product gas) for adsorbing 1/9 of beginning (air).Obviously, diffusion is disadvantageous to so low gas speed to gas.Simultaneously, because the influence of longitudinal diffusion is also unfavorable to improving product purity, thereby the utilization rate of adsorbent is reduced.Secondly, because the regeneration of adsorbent is to adopt to vacuumize desorb, thus the vacuum of having relatively high expectations, and wish that the energy consumption of vavuum pump is lower, so the adsorbent height can not be too high, generally be limited in 2～3m.Like this,, need long absorption path, thereby require the adsorbent layer height enough high from the utilization rate of adsorbent, and can not be too high with the efficient adsorbent layer height that obtains condition of high vacuum degree from the energy consumption of vavuum pump.This has caused many difficulties for the design technology condition, often is difficult to take into account.
In view of the above shortcoming of prior art, the objective of the invention is to explore a kind of more rational from multi component mixed gas gas the pressure swing adsorption technique of adsorbing separation volume component, make it can overcome the above shortcoming of prior art.
The objective of the invention is to realize by following means.
The pressure swing adsorption technique of adsorbing separation volume component from multi component mixed gas, adopt pressure swing adsorption method, gas componant with two or more absorber separating binaries or the above gaseous mixture of binary, each absorber is through absorption, pressure balance (boosting), desorb and pressure balance processing steps such as (step-downs) the realization transformation of finding time adsorption operations, absorber is built-in with a back taper inner core, and this back taper inner core is the adsorbent separated into two parts in the absorber; Material mixed gas enters the space outside the back taper inner core in the absorber from the absorber lower end, downward in the invagination taper inner core behind the arrival absorber epicoele, product gas is also exported from the absorber lower end; Adsorbent reactivation is vacuumized by cat head.
After adopting technology as above, reduce the variation of material mixed gas gas flow rate in adsorption process, improved the utilization rate of adsorbent; Reduce the resistance of finding time during desorb, helped the raising of vacuum, reduced the energy consumption of vavuum pump.
Description of drawings is as follows:
Fig. 1 is that existing transformation is adsorbed two tower PSA schematic flow sheets.
Fig. 2 is the pressure swing adsorption technique sequential list.
Fig. 3 is two tower PSA schematic flow sheets of the present invention.
Do more detailed narration below in conjunction with 3 pairs of technologies of the present invention of accompanying drawing.
As shown in Figure 3, the process modification part that the present invention produces oxygen to transformation absorption commonly used is: put into a concentric back taper inner core in absorber, processing step is identical with common PSA technology (Fig. 1), promptly through absorption, pressure balance (step-down), find time pressure balance (boosting) four-stage.Different is, one during for absorption compressed air through the annular space adsorbent of 1A valve from the absorber lower end enters the taper inner core outside, arrive the absorber top after, be folded to the adsorbent in the taper inner core, product oxygen is also exported through the 3A valve bottom absorber.As can be seen, along with the carrying out of adsorption process, gas flow is less and less, and the adsorbent sectional area that gas flow through is also more and more little, and the variation of gas speed has just reduced like this, thereby can improve the utilization rate of adsorbent; It is found time through the 2A valve from cat head two when the desorb, for common technology, finds time with regard to being equivalent to from the middle part of adsorption tower, has reduced the resistance of finding time, and helps the raising of vacuum, has reduced the energy consumption of vavuum pump.
Described generally speaking back taper inner core can with the concentricity axle of the body of the tower of absorber.From the angle of mass balance, the sectional area of taper inner core upper port equates with the area of this position by the ring section of absorber body of the tower and the encirclement of taper inner core upper port outer; Product tolerance and import air-fuel mixture amount are than the desirable ratio that equals lower port sectional area and annular cross-sectional area.
Embodiment 1
Oxygenerator two tower flow processs, its raw air amount is 3800Nm
3/ h, product tolerance 500Nm
3/ h adopts Fig. 1 flow process: tower diameter Φ=2600mm, adsorbent floor height 4100mm.Adopt the technology of Fig. 3 of the present invention, adsorption tower diameter of phi=3000mm, garden Taper Pipe upper end diameter Φ=2100mm, lower end diameter Φ=1000mm.Adopt the adsorbent of same amount, adsorbent floor height 3080mm.Compare with prior art Fig. 1 flow process, the absorption path increases 2060mm, improve adsorber structure and vacuumized a position, gas void tower velocity variations in adsorption process is reduced and the reduction of adsorbent total height, help the regeneration of finding time of adsorbent, thereby improved the adsorbent utilization rate, reduced the adsorbent consumption.
Though technology of the present invention is the example narration to produce oxygen with air, but its basic skills can be used for the pressure swing adsorption technique that other gaseous mixture need be removed a large amount of components with being equal to, concentrates methane etc. as the natural gas that extracts hydrogen from formaldehyde tail gas, contain up to 70% above carbon dioxide.Same reason, the scope of application of technology of the present invention also are applicable to the multitower flow process fully.
Claims (4)
1, a kind of from multi component mixed gas the pressure swing adsorption technique of adsorbing separation volume component, adopt pressure swing adsorption method, gas component with two or more absorber separating binaries or the above gaseous mixture of binary, each absorber is through absorption, pressure balance (step-down), desorb and the pressure balance processing steps such as (boosting) of finding time is realized the transformation adsorption operations, it is characterized in that, absorber is built-in with a back taper inner core, and this back taper inner core is the adsorbent separated into two parts in the absorber; The space of material mixed gas outside the absorber lower end enters absorber back taper inner core, downward in the invagination taper inner core behind the arrival absorber epicoele, product gas is also exported from the absorber lower end; Adsorbent reactivation is vacuumized by cat head.
2, according to claim 1 described from multi component mixed gas the pressure swing adsorption technique of adsorbing separation volume component, it is characterized in that the body of the tower of described back taper inner core and absorber is concentricity axle.
3, according to claim 1 or 2 described from multi component mixed gas the pressure swing adsorption technique of adsorbing separation volume component, it is characterized in that the sectional area of taper inner core upper port equates with the area of this position by the ring section of absorber body of the tower and the encirclement of taper inner core upper port outer.
4, according to claim 3 described from multi component mixed gas the pressure swing adsorption technique of adsorbing separation volume component, it is characterized in that taper inner core lower port sectional area and the ratio of annular cross-sectional area be desirable to equal the ratio of product tolerance and import air-fuel mixture amount.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031356168A CN1325143C (en) | 2003-08-18 | 2003-08-18 | Pressure swing adsorption process for adsorbing separated multiple component from multicomponent mixed gas |
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| CNB031356168A CN1325143C (en) | 2003-08-18 | 2003-08-18 | Pressure swing adsorption process for adsorbing separated multiple component from multicomponent mixed gas |
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| CN1583220A true CN1583220A (en) | 2005-02-23 |
| CN1325143C CN1325143C (en) | 2007-07-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112456445A (en) * | 2020-11-16 | 2021-03-09 | 尚铁军 | Efficient medical oxygen generator and oxygen generation method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4496376A (en) * | 1978-01-26 | 1985-01-29 | Litton Systems, Inc. | Variable area molecular sieve container having a thermal control system |
| US4194891A (en) * | 1978-12-27 | 1980-03-25 | Union Carbide Corporation | Multiple bed rapid pressure swing adsorption for oxygen |
| JPS62500641A (en) * | 1984-09-25 | 1987-03-19 | ユニオン カ−バイド コ−ポレ−シヨン | Enhanced performance in rapid pressure swing adsorption processing |
| CN1142006C (en) * | 2002-04-29 | 2004-03-17 | 成都天立化工科技有限公司 | Process for enriching oxygen in air by two-stage pressure swing adsorption |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112456445A (en) * | 2020-11-16 | 2021-03-09 | 尚铁军 | Efficient medical oxygen generator and oxygen generation method |
| CN112456445B (en) * | 2020-11-16 | 2022-05-31 | 河北金利康科技集团有限公司 | Efficient medical oxygen generator and oxygen generation method |
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Granted publication date: 20070711 |