CN113041782B - Gas pressure swing adsorption separation and purification system and separation and purification method thereof - Google Patents

Gas pressure swing adsorption separation and purification system and separation and purification method thereof Download PDF

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CN113041782B
CN113041782B CN202110275195.0A CN202110275195A CN113041782B CN 113041782 B CN113041782 B CN 113041782B CN 202110275195 A CN202110275195 A CN 202110275195A CN 113041782 B CN113041782 B CN 113041782B
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adsorption tower
adsorption
pressure
pressure equalizing
control valve
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CN113041782A (en
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陈健
卜令兵
王键
张宏宇
吴巍
周晓烽
李小荣
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Southwest Research and Desigin Institute of Chemical Industry
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0454—Controlling adsorption
    • 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
    • B01D53/0407—Constructional details of adsorbing systems
    • 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

Abstract

The invention discloses a gas pressure swing adsorption separation and purification system and a separation and purification method thereof, wherein the separation and purification system comprises an adsorption tower, a first program control valve 10X, a raw material gas conveying pipeline, a second program control valve 20X, a reverse-release flushing pipeline, a third program control valve 30X, a second/third pressure equalizing pipeline at the inlet end of the adsorption tower, a fourth program control valve 40X, a second/third pressure equalizing pipeline at the outlet end of the adsorption tower, a fifth program control valve 50X, a first pressure equalizing and final boosting pipeline, a sixth program control valve 60X, a product gas external conveying pipeline, a regeneration pipeline, a first pipeline and a final boosting regulating valve. The separation and purification method is that the adsorption tower is repeatedly subjected to an adsorption step, a pressure reduction step comprising a composite pressure equalizing and reducing step, a regeneration step, a pressure increasing step comprising a composite pressure equalizing and increasing step and a final pressure increasing step to carry out gas pressure swing adsorption separation and purification. The invention can effectively improve the dynamic adsorption capacity of the adsorbent, and improve the recovery rate and the separation and purification efficiency of the system.

Description

Gas pressure swing adsorption separation and purification system and separation and purification method thereof
Technical Field
The invention belongs to the technical field of pressure swing adsorption gas separation, and particularly relates to a gas pressure swing adsorption separation and purification system and a separation and purification method thereof.
Background
The pressure swing adsorption purification technology utilizes the difference of adsorption capacity of an adsorbent to different gases, and the characteristics that the adsorption capacity is increased along with the increase of adsorption pressure and is reduced along with the reduction of the adsorption pressure, so that the gases are adsorbed under high pressure and desorbed and regenerated under low pressure, thereby realizing the separation and purification of the gases. The gas with weak adsorption capacity flows out from the outlet end of the adsorption tower, so that non-adsorption phase products, such as purified hydrogen, nitrogen and the like, can be obtained; the gas with strong adsorption capacity flows out from the inlet end of the adsorption tower in the desorption process of the adsorbent, and adsorption phase products, such as purified carbon monoxide, carbon dioxide, hydrocarbons and the like, can be obtained.
The pressure swing adsorption process consists of a series of adsorption steps, depressurization steps and desorption regeneration steps, and is improved mainly by optimizing the steps constituting the pressure swing adsorption cycle and optimizing the combination of the steps. The simplest pressure swing adsorption process is a single-tower process, a double-tower process, a three-tower process, a four-tower process and the like are sequentially arranged along with the increase of the number of adsorption towers, the number of the adsorption towers required is more along with the increase of the scale of the device, the total circulating steps of the multi-tower process are more, and the types of the steps are more.
Generally, the most important performance index of the pressure swing adsorption process is the recovery rate of a target product, while the important process step influencing the recovery rate is a pressure equalizing step, the pressure equalizing step has various types, an outlet end pressure equalizing step is provided, namely outlet ends of two adsorption towers in the pressure equalizing step are communicated for pressure equalization, as shown in fig. 5, an inlet end pressure equalizing step is provided, namely inlet ends of the two adsorption towers in the pressure equalizing step are communicated for pressure equalization, as shown in fig. 6; the method comprises a step of equalizing pressure at two ends, namely a step of respectively communicating the inlet end and the outlet end of an adsorption tower for pressure equalization, as shown in FIG. 7; patents CN100434139C and CN100493671C introduce a two-end pressure equalizing step in a conventional pressure swing adsorption cycle, and the two-end pressure equalizing step is described in detail; there is also a series pressure equalizing step, i.e. the outlet end of the adsorption tower is communicated with the inlet end of the adsorption tower for pressure equalization, as shown in fig. 8; patent CN102091501A refers to the series pressure equalization as the upper and lower pressure equalization, and introduces the pressure equalization step into the pressure swing adsorption process; yanyan steel (Nanjing university of Industrial university, 2012, vol. 34, No. 4, P79-83) simulates the influence of different pressure equalizing modes on the oxygen making effect of two pressure swing adsorption towers, and research results show that the effect of series pressure equalizing is superior to that of pressure equalizing at two ends, and the effect of pressure equalizing at two ends is superior to that of pressure equalizing at the outlet end.
How to further improve the efficiency and optimize the cycle steps is still a problem to be researched and solved for large industrial devices.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: compared with the prior art, the gas pressure swing adsorption separation and purification system and the separation and purification method thereof can further improve the gas pressure swing adsorption separation efficiency and optimize the gas pressure swing adsorption separation cycle steps.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a gas pressure swing adsorption separation purification system comprises at least four adsorption towers, a raw material gas conveying pipeline which is connected into the adsorption towers and is provided with a first program control valve 10X, a reverse-discharge flushing pipeline provided with a second program control valve 20X, a second/third pressure equalizing pipeline provided with an inlet end of the adsorption tower provided with a third program control valve 30X, a second/third pressure equalizing pipeline at an outlet end of the adsorption towers, which is connected out of the adsorption towers and is provided with a fourth program control valve 40X, a first pressure equalizing and final boosting pipeline provided with a fifth program control valve 50X, a product gas outward conveying pipeline provided with a sixth program control valve 60X, and a regeneration pipeline connected into the adsorption towers or connected out of the adsorption towers, wherein a first pipeline is communicated between the second/third pressure equalizing pipeline at the inlet end of the adsorption towers and the second/third pressure equalizing pipeline at the outlet end of the adsorption towers, and the first pressure equalizing and final boosting pipeline is communicated with the product gas outward conveying pipeline through a final pressure boosting regulating valve, and a flushing pipeline provided with a seventh program control valve 70X is connected into the adsorption tower, and the pressure of the raw material gas in the raw material gas conveying pipeline is 1.0-7.0 MPa.
Furthermore, the regeneration pipeline comprises a flushing inlet pipeline which is connected out of the adsorption tower and is provided with an eighth program control valve 80X, and a forward discharge pipeline which is provided with a ninth program control valve 90X, and the flushing inlet pipeline and the forward discharge pipeline are communicated through a forward discharge regulating valve.
Further, the regeneration pipeline comprises an evacuation pipeline which is connected into the adsorption tower and is provided with a tenth program control valve 100X, and a vacuum pump is arranged on the evacuation pipeline.
Furthermore, the number of the vacuum pumps is at least two, and the vacuum pumps are connected to the evacuation pipeline in parallel.
Furthermore, a fourth/fifth pressure equalizing pipeline at the inlet end of the adsorption tower provided with an eleventh program control valve 110X is connected into the adsorption tower, a fourth/fifth pressure equalizing pipeline at the outlet end of the adsorption tower provided with a twelfth program control valve 120X is connected into the adsorption tower, and a second pipeline is communicated between the fourth/fifth pressure equalizing pipeline at the inlet end of the adsorption tower and the fourth/fifth pressure equalizing pipeline at the outlet end of the adsorption tower.
A separation and purification method of a gas pressure swing adsorption separation and purification system adopts at least four adsorption towers to respectively carry out gas pressure swing adsorption separation and purification through repeated circulation steps; each adsorption tower undergoes repeated circulation steps of adsorption, conventional pressure equalizing and reducing, composite pressure equalizing and reducing, forward discharging, reverse discharging, regeneration, composite pressure equalizing and boosting, conventional pressure equalizing and boosting and final boosting;
or, the repeated circulation steps of each adsorption tower are sequentially an adsorption step, a conventional pressure equalizing and reducing step, a composite pressure equalizing and reducing step, a reverse releasing step, a vacuumizing and regenerating step, a composite pressure equalizing and boosting step, a conventional pressure equalizing and boosting step and a final boosting step.
Further, the adsorption step is that the raw material gas enters the adsorption tower in the adsorption step from the inlet end of the adsorption tower in the adsorption step under the pressure of 1.0-7.0 MPa, strong adsorption components are adsorbed by the adsorbent, and weak adsorption components flow out from the outlet end of the adsorption tower in the adsorption step;
the pressure equalizing and reducing step and the pressure equalizing and increasing step correspond to each other, and the adsorption tower in the conventional pressure equalizing and reducing step is communicated with the outlet of the adsorption tower in the conventional pressure equalizing and increasing step to realize pressure balance;
the sequential release step is that the pressure of the adsorption tower in the pressure reduction step is reduced along the direction of the air flow during adsorption, and released gas provides regenerated gas for the adsorption tower in the regeneration stage or is discharged as waste gas;
the reverse discharging step is that the gas in the adsorption tower in the reverse discharging step flows out of the adsorption tower in the reverse discharging step against the flow direction of the gas during adsorption until the pressure in the adsorption tower in the reverse discharging step is reduced to normal pressure;
and in the final pressure boosting step, the pressure of the adsorption tower is boosted to the adsorption working pressure by using the product gas or the raw material gas in the adsorption tower completing the pressure equalizing and boosting step.
Further, the composite pressure equalizing and reducing step and the composite pressure equalizing and increasing step correspond to each other, the inlet and the outlet of the adsorption tower in the composite pressure equalizing and reducing step are simultaneously communicated with the inlet of the adsorption tower in the composite pressure equalizing and increasing step to realize pressure balance, and the ratio k of the gas outflow time from the inlet of the adsorption tower in the composite pressure equalizing and reducing step to the gas outflow time from the outlet of the adsorption tower in the composite pressure equalizing and reducing step meets the requirement that k is more than 0 and less than 1.
Further, during the step of composite pressure equalizing and reducing, the gas in the adsorption tower in the step of composite pressure equalizing and reducing flows out from the two ends of the outlet and the inlet to perform pressure reducing at the two ends, the gas flowing out from the inlet of the adsorption tower in the step of composite pressure equalizing and reducing flows into the adsorption tower in the step of composite pressure equalizing and reducing and flows into the adsorption tower in the step of composite pressure equalizing and reducing, the step times of the step of composite pressure equalizing and reducing are more than or equal to 1 and less than the total pressure equalizing step times, and the ratio k of the gas flowing-out time from the inlet direction of the adsorption tower in the step of composite pressure equalizing and reducing to the gas flowing-out time from the outlet direction of the adsorption tower is more than 0.2 and less than 0.7.
Further, the regeneration step is that the adsorption tower of the regeneration step finishes the desorption of the adsorbent under low pressure, and the adsorption tower of the regeneration step is flushed and regenerated along with the discharged gas from the outlet end of the adsorption tower of the regeneration step against the direction of the gas flow during the adsorption;
the evacuation regeneration step is that the adsorption tower in the evacuation regeneration step completes the desorption of the adsorbent under low pressure, and a vacuum pump vacuumizes the adsorption tower in the evacuation regeneration step from the inlet end of the adsorption tower in the evacuation regeneration step to regenerate the adsorbent.
Compared with the prior art, the invention has the following beneficial effects:
the invention has simple structure, scientific and reasonable design and convenient use, during the pressure equalizing process of pressure swing adsorption, the impurity front in the adsorption bed can be pushed to the outlet of the adsorption tower during the pressure equalizing and pressure reducing process at the outlet end, and for the pressure equalizing at both ends, the process that the impurity front in the adsorption bed moves forward during the pressure equalizing and pressure reducing process is weakened, therefore, the yield of the pressure equalizing at both ends is higher than the yield of the pressure equalizing at the outlet end, in addition, the pressure reducing gas at the outlet of the adsorption tower during the pressure equalizing and pressure reducing process contains partial impurities and can enter the adsorption bed for pressure equalizing and pressure increasing during the pressure equalizing and pressure increasing process at the outlet end, and the pressure reducing gas at the outlet of the adsorption tower can enter the upper part of the adsorption bed for pressure equalizing and pressure increasing, thereby influencing the adsorption capacity during the adsorption process, therefore, the pressure equalizing process in series, namely the pressure equalizing process at the outlet end and the pressure equalizing process of the pressure equalizing, thereby reducing the influence on the adsorption process, but the problem of impurity frontal surface migration in the adsorption bed in the pressure equalizing and reducing process is not solved by the series pressure equalizing. The invention carries out pressure equalization by a composite pressure equalization step, namely, the inlet and the outlet of the pressure equalization and depressurization adsorption tower are communicated with the inlet end of the pressure equalization and pressurization adsorption tower, thereby not only reducing the migration of impurity fronts in an adsorption bed in the pressure equalization and depressurization adsorption tower in the depressurization process, but also introducing the pressure equalization and depressurization gas into the inlet of the pressure equalization and pressurization adsorption bed, thereby improving the dynamic adsorption capacity of an adsorbent, obviously improving the recovery rate of a system and improving the separation and purification efficiency of a pressure swing adsorption system.
Drawings
FIG. 1 is a schematic system diagram of example 1 of the present invention.
FIG. 2 is a system diagram of example 2 of the present invention.
FIG. 3 is a system diagram of example 3 of the present invention.
Fig. 4 is a voltage-sharing diagram of the present invention.
Fig. 5 is a conventional outlet end pressure equalization schematic.
Fig. 6 is a schematic view of a conventional inlet end pressure equalization.
Fig. 7 is a schematic diagram of a conventional two-end voltage equalizing.
Fig. 8 is a schematic diagram of a conventional series voltage equalization.
Wherein, the names corresponding to the reference numbers are:
1-raw material gas conveying pipeline, 2-reverse discharge flushing pipeline, 3-second/third pressure equalizing pipeline at inlet end of adsorption tower, 4-second/third pressure equalizing pipeline at outlet end of adsorption tower, 5-first pressure equalizing and final boosting pipeline, 6-product gas external conveying pipeline, 7-flushing pipeline, 8-flushing inlet pipeline, 9-forward discharge pipeline, 10-evacuation pipeline, 11-fourth/fifth pressure equalizing pipeline at inlet end of adsorption tower, 12-fourth/fifth pressure equalizing pipeline at outlet end of adsorption tower, 13-adsorption tower, 14-first pipeline, 15-forward discharge regulating valve, 16-vacuum pump, 17-second pipeline and 18-final boosting regulating valve.
The first program control valve 10X, the second program control valve 20X, the third program control valve 30X, the fourth program control valve 40X, the fifth program control valve 50X, the sixth program control valve 60X, the seventh program control valve 70X, the eighth program control valve 80X, the ninth program control valve 90X, the tenth program control valve 100X, the eleventh program control valve 110X, and the twelfth program control valve 120X. Wherein, X of 10X, 20X, 30X, 40X, 50X, 60X, 70X, 80X, 90X, 100X, 110X and 120X is the number of the adsorption tower, and correspondingly, 10X, 20X, 30X, 40X, 50X, 60X, 70X, 80X, 90X, 100X, 110X and 120X are the numbers of the program control valves, as shown in fig. 3, T03 adsorption tower corresponds to 10X, 20X, 30X, 40X, 50X, 60X, 70X, 80X, 90X, 110X and 120X are respectively 103, 203, 303, 403, 503, 603, 703, 803, 903, 1103, 1203, T10 adsorption tower corresponds to 10X, 20X, 30X, 40X, 50X, 60X, 70X, 80X, 90X, 110X and 120X are respectively 110, 210, 310, 410, 510, 610, 1110, 1210, and so on the other similar.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and thus, it should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; of course, mechanical connection and electrical connection are also possible; alternatively, they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1-4, the present invention provides a gas pressure swing adsorption separation purification system, which comprises at least four adsorption towers 13, a mixed raw material gas delivery pipeline 1 connected to the adsorption tower 13 and provided with a first program control valve 10X, a reverse-discharge flushing pipeline 2 provided with a second program control valve 20X, an adsorption tower inlet end second/third pressure equalizing pipeline 3 provided with a third program control valve 30X, an adsorption tower outlet end second/third pressure equalizing pipeline 4 connected to the adsorption tower 13 and provided with a fourth program control valve 40X, a first pressure equalizing and final boosting pipeline 5 provided with a fifth program control valve 50X, a product gas output pipeline 6 provided with a sixth program control valve 60X, and a regeneration pipeline connected to the adsorption tower 13 or connected to the adsorption tower 13, wherein a first pipeline 14 is connected between the adsorption tower inlet end second/third pressure equalizing pipeline 3 and the adsorption tower outlet end second/third pressure equalizing pipeline 4, the first pressure equalizing and final boosting pipeline 5 is communicated with the product gas output pipeline 6 through a final boosting regulating valve 18. A flushing outlet pipeline 7 provided with a seventh program control valve 70X is also connected into the adsorption tower 13, and the pressure of the raw material gas in the raw material gas conveying pipeline 1 is 1.0-7.0 MPa. An adsorption tower inlet end fourth/fifth pressure equalizing pipeline 11 provided with an eleventh program control valve 110X is connected into the adsorption tower 13, an adsorption tower outlet end fourth/fifth pressure equalizing pipeline 12 provided with a twelfth program control valve 120X is connected into the adsorption tower 13, and a second pipeline 17 is communicated between the adsorption tower inlet end fourth/fifth pressure equalizing pipeline 11 and the adsorption tower outlet end fourth/fifth pressure equalizing pipeline 12.
The regeneration pipeline comprises a flushing inlet pipeline 8 which is connected from the interior of the adsorption tower 13 and is provided with an eighth program control valve 80X, and a forward discharge pipeline 9 which is provided with a ninth program control valve 90X, wherein the flushing inlet pipeline 8 is communicated with the forward discharge pipeline 9 through a forward discharge regulating valve 15. Or, the regeneration pipeline comprises an evacuation pipeline 10 which is connected into the adsorption tower 13 and is provided with a tenth program control valve 100X, and a vacuum pump 16 is arranged on the evacuation pipeline 10; at least two vacuum pumps 16 are provided, and the vacuum pumps 16 are connected in parallel to the evacuation line 10.
The invention provides a separation and purification method of a gas pressure swing adsorption separation and purification system, which adopts at least four adsorption towers to respectively carry out gas pressure swing adsorption separation and purification through repeated circulation steps; the repeated circulation steps of each adsorption tower are an adsorption step, a conventional pressure equalizing and reducing step, a composite pressure equalizing and reducing step, a forward discharging step, a reverse discharging step, a regeneration step, a composite pressure equalizing and boosting step, a conventional pressure equalizing and boosting step and a final boosting step in sequence. Or, the repeated circulation steps of each adsorption tower are sequentially an adsorption step, a conventional pressure equalizing and reducing step, a composite pressure equalizing and reducing step, a reverse releasing step, a vacuumizing and regenerating step, a composite pressure equalizing and boosting step, a conventional pressure equalizing and boosting step and a final boosting step.
In the adsorption step, the raw material gas enters the adsorption tower in the adsorption step from the inlet end of the adsorption tower in the adsorption step under the pressure of 1.0-7.0 MPa, strong adsorption components are adsorbed by the adsorbent, and weak adsorption components flow out from the outlet end of the adsorption tower in the adsorption step to form product gas. The pressure equalizing and reducing step and the pressure equalizing and increasing step correspond to each other, and the pressure equalizing and reducing step is realized by communicating an adsorption tower in the conventional pressure equalizing and reducing step with an outlet of an adsorption tower in the conventional pressure equalizing and increasing step. The sequential discharging step is a pressure reduction step, wherein the pressure of the adsorption tower is reduced along the direction of air flow during adsorption, and discharged gas is used for providing regeneration gas for the adsorption tower in a regeneration stage or is discharged as waste gas. The reverse discharging step is that the gas in the adsorption tower in the reverse discharging step flows out of the adsorption tower in the reverse discharging step against the gas flow direction during adsorption until the pressure in the adsorption tower in the reverse discharging step is reduced to normal pressure. And in the final pressure boosting step, the pressure of the adsorption tower is boosted to the adsorption working pressure by using the product gas or the raw material gas in the adsorption tower completing the pressure equalizing and boosting step.
The invention relates to a composite pressure equalizing and reducing step and a composite pressure equalizing and increasing step, which correspond to each other, and realize pressure balance by simultaneously communicating an inlet and an outlet of an adsorption tower in the composite pressure equalizing and reducing step with an inlet of the adsorption tower in the composite pressure equalizing and increasing step, wherein the ratio k of the gas outflow time from the inlet of the adsorption tower in the composite pressure equalizing and reducing step to the gas outflow time from the outlet of the adsorption tower in the composite pressure equalizing and reducing step is more than 0 and less than k < 1.
In the composite pressure equalizing and reducing step, gas in the adsorption tower in the composite pressure equalizing and reducing step flows out from two ends of an outlet and an inlet to perform pressure reduction at two ends, the gas flowing out of the adsorption tower in the composite pressure equalizing and reducing step flows into the adsorption tower in the composite pressure equalizing and increasing step to increase the pressure, the step number of the composite pressure equalizing and reducing step is more than or equal to 1 and less than the total pressure equalizing step number, and the ratio k of the gas flowing out time from the inlet of the adsorption tower in the composite pressure equalizing and reducing step to the gas flowing out time from the outlet of the adsorption tower in the composite pressure equalizing and reducing step is 0.2< k < 0.7.
The regeneration step of the invention is that the adsorption tower in the regeneration step finishes the desorption of the adsorbent under low pressure, and the adsorption tower in the regeneration step is flushed and regenerated along with the discharged gas from the outlet end of the adsorption tower in the regeneration step against the direction of the gas flow during adsorption; the evacuation regeneration step is that the adsorption tower in the evacuation regeneration step completes the desorption of the adsorbent under low pressure, and a vacuum pump vacuumizes the adsorption tower in the evacuation regeneration step from the inlet end of the adsorption tower in the evacuation regeneration step to regenerate the adsorbent.
When the invention carries out gas pressure swing adsorption separation and purification, more than four adsorption towers respectively pass through the repeated circulation step, each adsorption tower is filled with at least one adsorbent for selectively adsorbing the components which are easy to adsorb, and the repeated circulation steps which each adsorption tower passes through sequentially comprise (a) an adsorption step, (b) a pressure reduction step comprising a composite pressure equalizing and reducing step, (c) a regeneration step, (d) a pressure boosting step comprising a composite pressure equalizing and boosting step, and (e) a final pressure boosting step. Wherein:
(a) an adsorption step: the raw material gas enters the adsorption tower from the inlet end of the adsorption tower under the pressure of 1.0-7.0 MPa, the strong adsorption component is adsorbed by the adsorbent, and the weak adsorption component flows out from the outlet end of the adsorption tower.
(b) The pressure reduction step comprises a composite pressure equalizing and reducing step: the step of gradually reducing the pressure in the adsorption tower comprises a conventional pressure equalizing and reducing step (outlet end pressure equalizing and reducing step), a composite pressure equalizing and reducing step, a forward releasing step, a reverse releasing step or a conventional pressure equalizing and reducing step (outlet end pressure equalizing and reducing step), a composite pressure equalizing and reducing step and a reverse releasing step. The conventional pressure equalizing and reducing step corresponds to the conventional pressure equalizing and increasing step and is a process of realizing pressure balance by communicating a pressure equalizing and reducing adsorption tower with an outlet of the pressure equalizing and increasing adsorption tower, and the conventional pressure equalizing and reducing step is marked as nD; the composite pressure equalizing and reducing step corresponds to the composite pressure equalizing and increasing step and is a process that the inlet and the outlet of the pressure equalizing and reducing adsorption tower are simultaneously communicated with the inlet end of the composite pressure equalizing and increasing adsorption tower to realize pressure balance, and the composite pressure equalizing and reducing step is recorded as nFD; the sequential releasing step is that the pressure of the pressure reduction adsorption tower is reduced along the direction of air flow during adsorption, released gas provides regenerated gas for the adsorption tower in a regeneration stage, and the sequential releasing step is marked as PP; the reverse discharging step is a process in which the gas in the adsorption tower flows out of the adsorption tower against the flow of the gas during adsorption, and the pressure in the adsorption tower is reduced to normal pressure, and is marked as D.
(c) A regeneration step: and (3) finishing the step of desorbing the adsorbent by the adsorption tower under low pressure, flushing and regenerating the adsorption tower along with the discharged gas from the outlet end of the adsorption tower against the direction of the gas flow during adsorption, or vacuumizing the adsorption tower from the inlet end of the adsorption tower by a vacuum pump to regenerate the adsorbent, wherein the flushing step is marked as P, and the vacuumizing step is marked as V.
(d) The boosting step comprises a composite voltage-equalizing boosting step: accomplish the adsorption tower behind the regeneration and carry out pressure balance's step with the adsorption tower UNICOM that is in voltage-sharing step down, voltage-sharing step up is corresponding with voltage-sharing step down, step up and compound voltage-sharing step up including conventional voltage-sharing, wherein conventional voltage-sharing step up corresponds with conventional voltage-sharing step down, it is voltage-sharing step down adsorption tower and voltage-sharing step up the process that the adsorption tower export intercommunication realized pressure balance, conventional voltage-sharing step up is very nR, compound voltage-sharing step up is corresponding with compound voltage-sharing step down, it advances to be the adsorption tower of voltage-sharing step down, the export is linked together with the entry end of compound voltage-sharing step up adsorption tower simultaneously and realizes pressure balance's process, compound voltage-sharing step up is marked as nFR.
(e) And a final boosting step: and (3) the adsorption tower completing the pressure equalizing and boosting step, namely, the step of boosting the pressure of the adsorption tower to the adsorption pressure by utilizing product gas or raw material gas, and finally, the boosting step is recorded as FR.
In the composite pressure equalizing step, the ratio of the gas flowing time from the inlet end of the adsorption tower to the gas flowing time from the outlet end of the adsorption tower in the composite pressure equalizing and depressurizing adsorption tower is k, wherein k is more than 0 and less than 1, and preferably, k is more than 0.2 and less than 0.7. The number of times of the composite pressure equalizing and reducing step is more than or equal to 1 and less than the total number of times of the pressure equalizing and reducing step, the number of times of the composite pressure equalizing and reducing step is preferably 1-5, and the composite pressure equalizing and reducing step is after the conventional pressure equalizing step.
The invention provides a gas pressure swing adsorption separation and purification system, which adopts a combined pressure equalizing process combining a composite pressure equalizing step and a conventional pressure equalizing step to separate weak adsorbates and strong adsorbates from various mixed gases, wherein the product gas can be the weak adsorbates or the strong adsorbates, and each adsorption tower in the separation process sequentially goes through the following steps:
1. an adsorption step: the method comprises the following steps that a raw material gas enters an adsorption tower from the inlet end of the adsorption tower under the pressure of 1.0-7.0 MPa, strong adsorption components are adsorbed by an adsorbent, weak adsorption components flow out from the outlet end of the adsorption tower, and the adsorption step is marked as A.
2. And (3) a conventional pressure equalizing and reducing step: the conventional pressure equalizing and reducing step corresponds to the conventional pressure equalizing and increasing step and is a process for realizing pressure balance by communicating the pressure equalizing and reducing adsorption tower with the outlet of the pressure equalizing and increasing adsorption tower, and the conventional pressure equalizing and reducing step is recorded as nD.
3. And (3) compound pressure equalizing and reducing step: the composite pressure equalizing and reducing step corresponds to the composite pressure equalizing and increasing step and is a process that the inlet and the outlet of the pressure equalizing and reducing adsorption tower are simultaneously communicated with the inlet end of the composite pressure equalizing and increasing adsorption tower to realize pressure balance, and the composite pressure equalizing and reducing step is recorded as nFD; and in the step of composite pressure equalizing and reducing, gas in the adsorption tower flows out from two ends of the outlet and the inlet, namely pressure reducing at two ends, and flows in from the inlet of the composite pressure equalizing and boosting adsorption tower, namely pressure boosting at the inlet end. The composite pressure equalizing and reducing step is carried out after the conventional pressure equalizing and reducing step, and the number of the composite pressure reducing steps is more than 1. The ratio of the time of gas flowing out from the inlet end of the adsorption column to the time of gas flowing out from the outlet end of the adsorption column is k, 0< k <1, preferably 0.2< k <0.7, i.e., the time of depressurization from the inlet of the adsorption column is shorter than the time of depressurization from the outlet of the adsorption column.
4. Sequentially placing: the pressure reduction adsorption tower reduces the pressure along the direction of the air flow during adsorption, the discharged gas provides regeneration gas for the adsorption tower in the regeneration stage or is discharged as waste gas, the sequential step is marked as PP, and the process of evacuation regeneration can be free of the step.
5. Reverse amplification step: and D, the gas in the adsorption tower flows out of the adsorption tower against the gas flow during adsorption, the pressure in the adsorption tower is reduced to the normal pressure, and the reverse step is marked as D.
6. A regeneration step: and (3) finishing the step of desorbing the adsorbent by the adsorption tower under low pressure, flushing and regenerating the adsorption tower along with the discharged gas from the outlet end of the adsorption tower against the direction of the gas flow during adsorption, or vacuumizing the adsorption tower from the inlet end of the adsorption tower by a vacuum pump to regenerate the adsorbent, wherein the flushing step is marked as P, and the vacuumizing step is marked as V.
7. A step of compound voltage equalizing and boosting: the step of composite pressure equalizing and boosting corresponds to the step of composite pressure equalizing and reducing, and is a process that the inlet and the outlet of the adsorption tower for pressure equalizing and reducing are communicated with the inlet end of the adsorption tower for pressure equalizing and boosting simultaneously to realize pressure balance, and the step of composite pressure equalizing and boosting is recorded as nFR.
8. And (3) a conventional voltage equalizing and boosting step: the conventional pressure equalizing and boosting step corresponds to the conventional pressure equalizing and boosting, and is a process for realizing pressure balance by communicating a pressure equalizing and depressurizing adsorption tower with an outlet of a pressure equalizing and boosting adsorption tower, the conventional pressure equalizing and boosting step is nR, and the conventional pressure equalizing and boosting step is carried out after the composite pressure equalizing and boosting step and in a reverse direction.
9. And a final boosting step: and (3) the adsorption tower completing the pressure equalizing and boosting step, namely, the step of boosting the pressure of the adsorption tower to the adsorption pressure by utilizing product gas or raw material gas, and finally, the boosting step is recorded as FR.
In the pressure equalizing process of pressure swing adsorption, for the pressure equalizing step at the outlet end, in the pressure equalizing and pressure reducing process, the impurity front surface in the adsorption bed can be pushed towards the outlet of the adsorption tower, for the pressure equalizing at the two ends, the process that the impurity front surface in the adsorption bed moves forwards in the pressure equalizing and pressure reducing process becomes weaker, therefore, the yield of the pressure equalizing at the two ends is higher than the yield of the pressure equalizing at the outlet end, in addition, the pressure reducing gas at the outlet of the adsorption tower in the pressure equalizing and pressure reducing process contains partial impurities and can enter the adsorption bed with pressure equalizing and pressure increasing in the pressure equalizing and pressure increasing process, for the pressure equalizing process at the outlet end and the pressure equalizing process at the two ends, the pressure reducing gas at the outlet of the adsorption tower can enter the upper part of the pressure equalizing and pressure increasing adsorption bed, thereby the adsorption capacity in the adsorption process is influenced, therefore, the pressure equalizing process in series, namely the pressure equalizing process that the pressure equalizing process at the outlet end and the pressure equalizing process are both ends and the pressure equalizing process are introduced into the bottom of the pressure equalizing and pressure equalizing adsorption tower, but the series pressure equalizing does not solve the problem of impurity frontal surface migration in the adsorption bed in the pressure equalizing and reducing process. The invention carries out pressure equalization by a composite pressure equalization step, namely, the inlet and the outlet of the pressure equalization and depressurization adsorption tower are communicated with the inlet end of the pressure equalization and pressurization adsorption tower, thereby not only reducing the migration of impurity fronts in an adsorption bed in the pressure equalization and depressurization adsorption tower in the depressurization process, but also introducing the pressure equalization and depressurization gas into the inlet of the pressure equalization and pressurization adsorption bed, thereby improving the dynamic adsorption capacity of an adsorbent, obviously improving the recovery rate of a system and improving the separation and purification efficiency of a pressure swing adsorption system.
In order to make the technical solution better understood by those skilled in the art, the following three examples are provided for illustration.
Example 1: 5, washing the tower to regenerate the pressure swing adsorption process.
As shown in FIG. 1, 5-1-2/P process, i.e., 5 adsorption columns and 2 pressure equalizing flushing process were used, and the process sequence is shown in Table 2. The whole process consists of 15 steps, the adsorption tower sequentially goes through 3 adsorption steps, 2 pressure equalizing and depressurizing steps, 2 forward releasing steps, 2 reverse releasing steps, 2 flushing steps, 2 pressure equalizing and boosting steps and 2 final boosting steps, wherein the first pressure equalizing and depressurizing step in the pressure equalizing and depressurizing steps is a conventional pressure equalizing and depressurizing step, the second pressure equalizing and depressurizing step is a composite pressure equalizing and depressurizing step, the first pressure equalizing and boosting step in the pressure equalizing and boosting steps is a conventional pressure equalizing and depressurizing step, the second pressure equalizing and depressurizing step is a composite pressure equalizing and depressurizing step, and the second/third pressure equalizing pipeline 4 at the outlet end of the adsorption tower is communicated with the second/third pressure equalizing pipeline 3 at the inlet end of the adsorption tower through a first pipeline 14.
Each adsorption tower is sequentially subjected to the following steps (taking the adsorption tower T01 as an example, for convenience of description, the adsorption tower 13 will be described below using specific tower numbers, that is, the adsorption tower 13 will be described as an adsorption tower T01, an adsorption tower T02, an adsorption tower T03, an adsorption tower T04 and an adsorption tower T05 according to the specific involved adsorption towers):
1. an adsorption step A: raw material gas enters an adsorption tower T01 from the inlet end of the adsorption tower through a raw material gas conveying pipeline 1 and a first program control valve 101 (raw material gas program control valve), strong adsorption components are adsorbed by an adsorbent, weak adsorption components flow out from the outlet end of the adsorption tower, and weak adsorption product gas is taken as weak adsorption product gas to be sent out of the system through a sixth program control valve 601 (product gas program control valve) and a product gas outward conveying pipeline 6.
2. A first voltage equalizing and reducing step 1D: close first program control valve 101 (feed gas program control valve) and sixth program control valve 601 (product gas program control valve) of import and export of T01, open fifth program control valve 501 (first pressure equalization and final pressure boost program control valve) and fifth program control valve 503 (first pressure equalization and final pressure boost program control valve), adsorption tower T01 and adsorption tower T03's exit end UNICOM, adsorption tower T01 carries out the pressure equalization with adsorption tower T03, T01 carries out first pressure equalization step-down, adsorption tower T03 carries out first pressure equalization step-up.
3. Cis 1 step PP 1: after the first pressure equalizing and reducing step is finished, the fifth program control valve 501 (the first pressure equalizing and final pressure increasing program control valve) of the adsorption tower T01 is closed, the ninth program control valve 901 and the eighth program control valve 804 (the flushing program control valve) are opened, the pressure of the adsorption tower T01 is reduced along the air flow direction during adsorption, the released gas enters the adsorption tower from the outlet of the adsorption tower T04 through the forward release pipeline 9, the forward release regulating valve 15 and the flushing pipeline 8, and the eighth program control valve 804 (the flushing program control valve) and is used for flushing regeneration of the adsorption tower T04, the adsorption tower T01 performs the forward release step, and the adsorption tower T04 performs the flushing regeneration step.
4. A second composite pressure equalizing and reducing step 2 FD: after the sequential discharging step 1 is finished, a ninth program control valve 901 of the adsorption tower T01 is closed, a fourth program control valve 401, a third program control valve 301 and a third program control valve 304 corresponding to the adsorption tower T04 are opened, the outlet and inlet of the adsorption tower T01 are communicated with the inlet of the adsorption tower T04 for pressure balance, gas in the adsorption tower T01 flows out from the two ends of the adsorption tower and enters the adsorption tower from the inlet of the adsorption tower T04, the adsorption tower T01 performs a second compound pressure equalizing and reducing step, and the adsorption tower T04 performs a second compound pressure equalizing and increasing step.
5. Cis 2 step PP 2: after the second composite pressure equalizing and reducing step is finished, the fourth program control valve 401 and the third program control valve 301 of the adsorption tower T01 are closed, the ninth program control valve 901 and the eighth program control valve 805 (flushing program control valves) are opened, the pressure of the adsorption tower T01 is reduced along the air flow direction during adsorption, the discharged gas enters the adsorption tower T05 from the outlet of the adsorption tower T01 through the forward discharging pipeline 9, the forward discharging regulating valve 15, the flushing pipeline 8 and the eighth program control valve 805 (flushing program control valves) for flushing regeneration of the adsorption tower T05, the adsorption tower T01 performs the forward discharging step, and the adsorption tower T05 performs the flushing regeneration step.
6. And D, reverse amplification: after the forward release step is finished, the ninth program control valve 901 at the outlet of the adsorption tower T01 is closed, the second program control valve 201 at the inlet is opened, the gas in the adsorption tower flows out of the adsorption tower T01 in the direction opposite to the gas flow during adsorption, and the gas passes through the second program control valve 201 (reverse release flushing program control valve) and the reverse release flushing pipeline 2 to be taken as desorption gas to be sent out of the system, so that the pressure in the adsorption tower is reduced to the normal pressure.
7. Rinse regeneration 2 step P2: after the reverse-releasing step is finished, the eighth program control valve 801 (flushing inlet program control valve) at the outlet of the adsorption tower T01 is opened, the ninth program control valve 902 is opened, the forward release gas flowing out of the outlet of the adsorption tower T02 enters the adsorption tower T01 from the outlet of the adsorption tower T01 through the regulating valve 15 and the flushing inlet pipeline 8, the adsorption tower T01 is flushed and regenerated, and the regenerated waste gas is used as desorption gas to be sent out of the system through the second program control valve 201 (reverse-releasing flushing program control valve) and the reverse-releasing flushing pipeline 2.
8. Flush regeneration 1 step P1: after the step 2 of flushing regeneration is finished, the ninth programmable valve 902 is closed, the ninth programmable valve 903 is opened, the forward exhaust gas flowing out of the outlet of the adsorption tower T03 enters the adsorption tower T01 from the outlet of the adsorption tower T01 through the regulating valve 15 and the flushing inlet pipeline 8, the adsorption tower T01 is flushed and regenerated, and the regenerated waste gas is taken as desorption gas to be sent out of the system through the second programmable valve 201 (reverse-release flushing programmable valve) and the reverse-release flushing pipeline 2.
9. A second composite voltage-equalizing and boosting step 2 FR: after the step 1 of flushing regeneration is finished, closing an eighth program control valve 801 (flushing inlet program control valve) and a second program control valve 201 (reverse flushing program control valve) of an adsorption tower T01, opening a third program control valve 301 and a third program control valve 303 and a fourth program control valve 403 corresponding to an adsorption tower T03, communicating an inlet of an adsorption tower T01 with an outlet and an inlet of an adsorption tower T03 in the second composite pressure equalizing and reducing step for pressure equalization, allowing pressure equalizing and reducing gas of the adsorption tower T03 to flow out from two ends and enter from an inlet of an adsorption tower T01, and allowing an adsorption tower T01 to perform the second composite pressure equalizing and increasing step;
10. first voltage-equalizing and boosting step 1R: after the second composite pressure equalizing and boosting step is finished, the third programmable valve 301 at the inlet of the adsorption tower T01 is closed, the fifth programmable valve 501 (the first pressure equalizing and final boosting programmable valve) and the fifth programmable valve 504 (the first pressure equalizing and final boosting programmable valve) are opened, and the adsorption tower T01 and the outlet of the adsorption tower T04 in the first pressure equalizing and reducing step are communicated through the fifth programmable valve 501 (the first pressure equalizing and final boosting programmable valve) and the first pressure equalizing and final boosting pipeline 5 to perform pressure balance.
11. Final boosting step FR: after the first pressure equalizing and boosting step is completed, the final pressure-boosting regulating valve 18 is opened, and the product gas enters the adsorption tower T01 through the final pressure-boosting regulating valve 18, the first pressure equalizing and final pressure-boosting pipeline 5 and the fifth program control valve 501 (the first pressure equalizing and final pressure-boosting program control valve) to boost the pressure of the adsorption tower T01 until the pressure of the adsorption tower T01 is balanced with the pressure of the product gas.
Examples experiments
5 tower washing process simulation experiment device has been built in the experiment, contrasts different voltage-sharing modes, has carried out the contrast of conventional adsorption tower outlet voltage-sharing, both ends voltage-sharing simultaneously, series connection voltage-sharing and compound voltage-sharing respectively promptly to the second step voltage-sharing. The experiment adopts a molecular sieve adsorption bed, the adsorption pressure is 1.0MPaG, the regeneration pressure is 0.02MPaG, and the feed gas composition is as follows: v (H2): v (N2): v (CH 4): v (co) = 80: 7: 10: and 3, the purity of the product hydrogen is 99.9%, the time sequence is shown in table 2, the operation data of different pressure equalizing modes are shown in table 1, and as can be seen from table 1, the hydrogen recovery rate and the feed gas processing capacity after the composite pressure equalizing are increased are obviously higher than the upper pressure equalizing, the pressure equalizing at two ends and the series pressure equalizing.
Table 1 experimental simulation experiment results of different voltage equalizing modes
Working conditions 2 uniform pressure equalizing mode Hydrogen recovery rate/%) Raw gas treatment capacity/relative value
1 Upper pressure equalizing 80.2 100
2 Both ends pressure equalizing 80.6 104
3 Series voltage sharing 81.2 109
4 Composite pressure equalizing device 82 116
Table 2 example 1 timing sequence
Step (ii) of 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
T01 A A A 1D PP1 2FD PP2 D D P2 P1 2FR 1R FR FR
T02 1R FR FR A A A 1D PP1 2FD PP2 D D P2 P1 2FR
T03 P2 P1 2FR 1R FR FR A A A 1D PP1 2FD PP2 D D
T04 PP D D P2 P1 2FR 1R FR FR A A A 1D PP 2FD
T05 1D PP 2FD PP D D P2 P1 2FR 1R FR FR A A A
Note: a: adsorption step, 1D: a first pressure equalizing and reducing step, PP 1: step 1, 2 FD: a second composite pressure equalizing and reducing step, namely PP 2: step 2, placing in sequence, D: reverse playback step, P2: washing 2 step, P1: rinse 1 step, 2 FR: a second composite voltage-equalizing and boosting step, 1R: a first voltage equalizing and boosting step, FR: and finally, a pressure rising step.
Example 2: 6 tower is pumped out to regenerate the pressure swing adsorption process.
As shown in FIG. 2, the process sequence is shown in Table 3 using a 6-1-3/V process, i.e., 6 adsorbers with 3 equal pressure evacuation regenerations. The whole process consists of 18 steps, the adsorption tower sequentially goes through 3 adsorption steps, 3 pressure equalizing and pressure reducing steps, 1 reverse releasing step, 4 evacuation steps, 3 pressure equalizing and pressure boosting steps, 2 isolation steps and 2 final pressure boosting steps, wherein the first pressure equalizing and pressure reducing step in the pressure equalizing and pressure reducing steps is a conventional pressure equalizing and pressure reducing step, the second pressure equalizing and pressure reducing step and the third pressure equalizing and pressure reducing step are composite pressure equalizing and pressure reducing steps, the first pressure equalizing and pressure boosting step in the pressure equalizing and pressure boosting steps is a conventional pressure equalizing and pressure reducing step, the second pressure equalizing and pressure reducing step and the third pressure equalizing and pressure boosting step are composite pressure equalizing and pressure boosting steps, and the second/third pressure equalizing pipeline 4 at the outlet end of the adsorption tower is communicated with the second/third pressure equalizing pipeline 3 at the inlet end of the adsorption tower through a first pipeline 14.
Each adsorption column is sequentially subjected to the following steps (taking the adsorption column T01 as an example, for convenience of description, the adsorption column 13 will be described below using specific column numbers, that is, the adsorption column 13 will be described as adsorption column T01, adsorption column T02, adsorption column T03, adsorption column T04, adsorption column T05 and adsorption column T06 according to the specific adsorption column concerned):
1. an adsorption step A: raw material gas enters an adsorption tower T01 from the inlet end of an adsorption tower T01 through a raw material gas conveying pipeline 1 and a first program control valve 101, strong adsorption components are adsorbed by an adsorbent, weak adsorption components flow out from the outlet end of the adsorption tower T01, and weak adsorption product gas serves as weak adsorption product gas to be sent out of the system through a sixth program control valve 601 and a product gas external conveying pipeline 6.
2. A first voltage equalizing and reducing step 1D: closing a first programmable valve 101 and a sixth programmable valve 601 at the inlet and outlet of the T01, opening a fifth programmable valve 501 (a first pressure equalizing and final boosting programmable valve) and a fifth programmable valve 503 (a first pressure equalizing and final boosting programmable valve), communicating the outlet ends of an adsorption tower T01 and an adsorption tower T03, equalizing the pressure of the adsorption tower T01 and an adsorption tower T03, depressurizing the adsorption tower T01 at a first pressure equalizing pressure, and boosting the pressure of the adsorption tower T03 at a first pressure equalizing pressure.
3. A second composite pressure equalizing and reducing step 2 FD: after the first pressure equalizing and reducing step is finished, the fifth program control valve 501 (the first pressure equalizing and final pressure increasing program control valve) is closed, the third program control valve 304 corresponding to the fourth program control valve 401, the third program control valve 301 and the adsorption tower T04 is opened, the outlet of the adsorption tower T01 and the inlet of the adsorption tower T04 are communicated for pressure balance, the gas in the adsorption tower T01 flows out from the two ends of the adsorption tower and enters the adsorption tower from the inlet of the adsorption tower T04, the adsorption tower T01 is subjected to a second composite pressure equalizing and reducing step, and the adsorption tower T04 is subjected to a second composite pressure equalizing and reducing step.
4. A third composite pressure equalizing and reducing step 3 FD: after the second composite pressure-equalizing and pressure-reducing step is finished, the third program control valve 304 is closed, the third program control valve 305 is opened, the outlet and inlet of the adsorption tower T01 are communicated with the inlet of the adsorption tower T05 for pressure balance, gas in the adsorption tower T01 flows out from the two ends of the adsorption tower and enters the adsorption tower from the inlet of the adsorption tower T05, the adsorption tower T01 performs a third composite pressure-equalizing and pressure-reducing step, and the adsorption tower T05 performs a third composite pressure-equalizing and pressure-increasing step.
5. And D, reverse amplification: after the third composite pressure equalizing and reducing step is finished, closing a fourth program control valve 401 and a third program control valve 301 of an adsorption tower T01, opening a second program control valve 201 (reverse release program control valve) at an inlet, enabling gas in the adsorption tower to flow out of the adsorption tower against the gas flow during adsorption, sending the gas out of the system as reverse release gas through the second program control valve 201 and a reverse release flushing pipeline 2, and reducing the pressure in the adsorption tower to the normal pressure;
6. evacuation regeneration step V: after the reverse discharging step is finished, the second programmable valve 201 (reverse discharging programmable valve) of the adsorption tower T01 is closed, the tenth programmable valve 1001 (evacuation programmable valve) is opened, the vacuum pump 16 evacuates and regenerates the adsorption tower T01, and the evacuated air is sent out of the system as the evacuated air through the evacuation pipeline 10.
7. A third composite voltage-equalizing and boosting step 3 FR: after the evacuation step is finished, closing a tenth program control valve 1001 (evacuation program control valve) of the adsorption tower T01, opening a third program control valve 301, a third program control valve 303 and a fourth program control valve 403 of the adsorption tower T03, communicating the inlet of the adsorption tower T01 with the inlet and the outlet of the adsorption tower T03 in the third composite pressure equalizing and reducing step for pressure balancing, allowing pressure equalizing and reducing gas of the adsorption tower T03 to flow out from the two ends and enter from the inlet of the adsorption tower T01, and allowing the adsorption tower T01 to perform the third composite pressure equalizing and increasing step;
8. a second composite voltage-equalizing and boosting step 2 FR: after the third composite pressure equalizing and boosting step is completed, the third program control valve 303 and the fourth program control valve 403 are closed, after an isolation step, the third program control valve 304 and the fourth program control valve 404 are opened, the inlet of the adsorption tower T01 is communicated with the inlet and the outlet of the adsorption tower T04 in the second composite pressure equalizing and boosting step for pressure balance, pressure equalizing and depressurizing gas of the adsorption tower T04 flows out from the two ends and enters from the inlet of the adsorption tower T01, and the adsorption tower T01 is subjected to the second composite pressure equalizing and boosting step;
9. first voltage-equalizing and boosting step 1R: after the second composite pressure equalizing and boosting step is completed, the third program control valve 301, the third program control valve 304 and the fourth program control valve 404 are closed, after an isolation step, the fifth program control valve 501 (the first pressure equalizing and final boosting program control valve) and the fifth program control valve 505 (the first pressure equalizing and final boosting program control valve) are opened, and the adsorption tower T01 and the outlet of the T05 in the first pressure equalizing and reducing step are communicated through the fifth program control valve 501 (the first pressure equalizing and final boosting program control valve) and the first pressure equalizing and final boosting pipeline 5 to perform pressure balance.
10. Final boosting step FR: after the first pressure equalizing and boosting step is completed, the final pressure-boosting regulating valve 18 is opened, and the product gas enters the adsorption tower through the final pressure-boosting regulating valve 18, the first pressure equalizing and final pressure-boosting pipeline 5 and the fifth program control valve 501 (the first pressure equalizing and final pressure-boosting program control valve) to boost the pressure of the adsorption tower T01 until the pressure of the adsorption tower T01 is balanced with the pressure of the product gas.
Table 3 example 2 timing sequence chart
Step (ii) of 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
T01 A A A 1D 2FD 3FD D V V V V 3FR IS 2FR IS 1R FR FR
T02 1R FR FR A A A 1D 2FD 3FD D V V V V 3FR IS 2FR IS
T03 IS 2FR IS 1R FR FR A A A 1D 2FD 3FD D V V V V 3FR
T04 V V 3FR IS 2FR IS 1R FR FR A A A 1D 2FD 3FD D V V
T05 D V V V V 3FR IS 2FR IS 1R FR FR A A A 1D 2FD 3FD
T06 1D 2FD 3FD D V V V V 3FR IS 2FR IS 1R FR FR A A A
Note: a: adsorption step, 1D: a first pressure equalizing and reducing step, 2 FD: a second composite pressure equalizing and reducing step, 3 FD: a third composite pressure equalizing and reducing step D: reverse amplification step, V: evacuation step, 3 FR: a third composite voltage-equalizing and boosting step, IS: an isolation step; 2 FR: a second composite voltage-equalizing and boosting step, 1R: a first voltage equalizing and boosting step, FR: and finally, a pressure rising step.
Example 3: the pressure swing adsorption process is regenerated by flushing 10 towers.
As shown in FIG. 3, the process sequence is shown in Table 4 using a 10-2-4/P process, i.e., 10 adsorbers with 4 pressure-equalizing flushing processes. The whole process consists of 20 steps, the adsorption tower sequentially goes through 4 adsorption steps, 4 pressure equalizing and depressurizing steps, 2 forward releasing steps, 2 reverse releasing steps, 4 flushing steps, 4 pressure equalizing and boosting steps and 1 final boosting step, wherein the first pressure equalizing and depressurizing step in the pressure equalizing and depressurizing steps is a conventional pressure equalizing and depressurizing step, the second pressure equalizing and depressurizing step, the third pressure equalizing and depressurizing step and the fourth pressure equalizing and depressurizing step are composite pressure equalizing and depressurizing steps, the first pressure equalizing and boosting step in the pressure equalizing and boosting steps is a conventional pressure equalizing and depressurizing step, the second pressure equalizing and depressurizing step, the third pressure equalizing and boosting step and the fourth pressure equalizing and boosting step are composite pressure equalizing and depressurizing steps, the second/third pressure equalizing pipeline 4 at the outlet end of the adsorption tower is communicated with the second/third pressure equalizing pipeline 3 at the inlet end of the adsorption tower through a first pipeline 14, the fourth/fifth pressure equalizing pipeline 12 at the outlet end of the adsorption tower is communicated with the fourth/fifth pressure equalizing pipeline 11 at the inlet end of the adsorption tower through a second pipeline 14 The line 17 is continuous.
Each adsorption column was sequentially subjected to the following steps (taking adsorption column T01 as an example):
1. an adsorption step A: raw material gas enters an adsorption tower T01 from the inlet end of the adsorption tower through a raw material gas conveying pipeline 1 and a first program control valve 101 (raw material gas program control valve), strong adsorption components are adsorbed by an adsorbent, weak adsorption components flow out from the outlet end of the adsorption tower, and weak adsorption product gas is taken as weak adsorption product gas to be sent out of the system through a sixth program control valve 601 (product gas program control valve) and a product gas outward conveying pipeline 6.
2. A first voltage equalizing and reducing step 1D: close first program control valve 101 (feed gas program control valve) and sixth program control valve 601 (product gas program control valve) of import and export of T01, open fifth program control valve 501 (first pressure equalization and final pressure boost program control valve) and fifth program control valve 504 (first pressure equalization and final pressure boost program control valve), adsorption tower T01 and adsorption tower T04's exit end UNICOM, adsorption tower T01 carries out the pressure equalization with adsorption tower T04, T01 carries out first pressure equalization step-down, adsorption tower T04 carries out first pressure equalization step-up.
3. A second composite pressure equalizing and reducing step 2 FD: after the first pressure equalizing and reducing step is finished, the fifth program control valve 501 (the first pressure equalizing and final pressure increasing program control valve) is closed, the third program control valve 305 corresponding to the fourth program control valve 401, the third program control valve 301 and the adsorption tower T05 is opened, the outlet of the adsorption tower T01 and the inlet of the adsorption tower T05 are communicated for pressure balance, the gas in the adsorption tower T01 flows out from the two ends of the adsorption tower and enters the adsorption tower from the inlet of the adsorption tower T05, the adsorption tower T01 is subjected to a second composite pressure equalizing and reducing step, and the adsorption tower T05 is subjected to a second composite pressure equalizing and reducing step.
4. A third composite pressure equalizing and reducing step 3 FD: after the second composite pressure-equalizing and pressure-reducing step is finished, the third program control valve 305 is closed, the third program control valve 306 is opened, the outlet and inlet of the adsorption tower T01 are communicated with the inlet of the adsorption tower T06 to realize pressure balance, gas in the adsorption tower T01 flows out from the two ends of the adsorption tower and enters the adsorption tower from the inlet of the adsorption tower T06, the adsorption tower T01 performs a third composite pressure-equalizing and pressure-reducing step, and the adsorption tower T06 performs a third composite pressure-equalizing and pressure-increasing step.
5. A fourth step of composite pressure equalizing and reducing 4 FD: after the third composite pressure equalizing and reducing step is finished, the third program control valve 301, the third program control valve 306 and the fourth program control valve 401 are closed, the twelfth program control valve 1201, the eleventh program control valve 1101 and the eleventh program control valve 1107 are opened, the outlet and the inlet of the adsorption tower T01 are communicated with the inlet of the adsorption tower T07 for pressure balance, the gas in the adsorption tower T01 flows out from the two ends of the adsorption tower and enters the adsorption tower from the inlet of the adsorption tower T07, the adsorption tower T01 performs the fourth composite pressure equalizing and reducing step, and the adsorption tower T07 performs the fourth composite pressure equalizing and reducing step.
6. Cis 1 step PP 1: after the fourth composite pressure equalizing and reducing step is finished, closing a twelfth program control valve 1201 and an eleventh program control valve 1101 of the adsorption tower T01, opening a ninth program control valve 901, reducing the pressure of the adsorption tower T01 along the airflow direction during adsorption, allowing the released gas to enter the adsorption towers from the outlets of the adsorption towers T08 and T09 through a forward release pipeline 9, a forward release regulating valve 15, a flushing inlet pipeline 8, an eighth program control valve 808 and an eighth program control valve 809 to flush and regenerate the adsorption towers T08 and T09, allowing the adsorption tower T01 to perform a forward release step, and allowing the adsorption towers T08 and T09 to perform a flushing and regenerating step.
7. Cis 2 step PP 2: after the sequential release 1 step is finished, closing an eighth program control valve 808 of the adsorption tower T08, opening an eighth program control valve 810, enabling gas released from the adsorption tower T01 to enter the adsorption tower from outlets of the adsorption tower T09 and the adsorption tower T10 through a sequential release pipeline 9, a sequential release regulating valve 15, a flushing inlet pipeline 8, an eighth program control valve 809 and the eighth program control valve 810 to flush and regenerate the adsorption tower T09 and the adsorption tower T10, enabling the adsorption tower T01 to perform a sequential release step, and enabling the adsorption tower T09 and the adsorption tower T10 to perform a flushing regeneration step.
8. And D, reverse amplification: after the forward-releasing step is finished, the ninth program control valve 901 at the outlet of the adsorption tower T01 is closed, the second program control valve 201 at the inlet is opened, the gas in the adsorption tower flows out of the adsorption tower in the direction opposite to the gas flow during adsorption, the gas flows out of the adsorption tower through the second program control valve 201 (reverse-releasing flushing program control valve) and the reverse-releasing flushing pipeline 2 and serves as desorption gas to be sent out of the system, and the pressure in the adsorption tower is reduced to the normal pressure.
9. A washing regeneration step P: after the reverse discharging step is finished, the second program control valve 201 is closed, the eighth program control valve 801 (flushing inlet program control valve) and the seventh program control valve 701 (flushing outlet program control valve) at the outlet of the adsorption tower T01 are opened, the forward discharge gas flowing out of the outlets of other adsorption towers enters the adsorption tower T01 from the outlet of the adsorption tower through the forward discharge regulating valve 15 and the flushing inlet pipeline 8, the adsorption tower T01 is flushed and regenerated, and the regenerated waste gas is sent out of the system as desorption gas through the seventh program control valve 701 (flushing outlet program control valve) and the flushing outlet pipeline 7.
10. A fourth composite voltage-equalizing and boosting step 4 FR: after the flushing step is finished, the eighth program control valve 801 (flushing inlet program control valve) and the seventh program control valve 701 (flushing outlet program control valve) of the adsorption tower T01 are closed, the eleventh program control valve 1101, the eleventh program control valve 1105 and the twelfth program control valve 1205 are opened, the inlet of the adsorption tower T01 is communicated with the inlet and the outlet of the adsorption tower T05 in the fourth composite pressure equalizing and reducing step for pressure balancing, the pressure equalizing and reducing gas of the adsorption tower T05 flows out from the two ends and enters the adsorption tower T01 from the inlet, and the adsorption tower T01 is used for the fourth composite pressure equalizing and reducing step.
11. A third composite voltage-equalizing and boosting step 3 FR: after the fourth composite pressure equalizing and boosting step is completed, the eleventh program control valve 1101, the eleventh program control valve 1105 and the twelfth program control valve 1205 are closed, the third program control valve 301, the third program control valve 306 and the fourth program control valve 406 are opened, the inlet of the adsorption tower T01 is communicated with the inlet and the outlet of the adsorption tower T06 in the third composite pressure equalizing and boosting step for pressure balance, the pressure equalizing and depressurizing gas of the adsorption tower T06 flows out from the two ends and enters from the inlet of the adsorption tower T01, and the adsorption tower T01 performs the third composite pressure equalizing and boosting step.
12. A second composite voltage-equalizing and boosting step 2 FR: after the third composite pressure equalizing and boosting step is completed, the third program control valve 306 and the fourth program control valve 406 are closed, the third program control valve 307 and the fourth program control valve 407 are opened, the inlet of the adsorption tower T01 is communicated with the inlet and the outlet of the adsorption tower T07 in the second composite pressure equalizing and boosting step for pressure balance, pressure equalizing and depressurizing gas of the adsorption tower T07 flows out from the two ends and enters from the inlet of the adsorption tower T01, and the adsorption tower T01 performs the second composite pressure equalizing and boosting step;
13. first voltage-equalizing and boosting step 1R: after the second composite pressure equalizing and boosting step is completed, the third program control valve 301 at the inlet of the adsorption tower T01 is closed, the fifth program control valve 501 (the first pressure equalizing and final boosting program control valve) and the fifth program control valve 508 (the first pressure equalizing and final boosting program control valve) are opened, and the adsorption tower T01 and the outlet of the T08 in the first pressure equalizing and reducing step are communicated through the fifth program control valve 501 (the first pressure equalizing and final boosting program control valve) and the first pressure equalizing and final boosting pipeline 5 for pressure balancing.
14. Final boosting step FR: after the first pressure equalizing and boosting step is completed, the final pressure-boosting regulating valve 18 is opened, and the product gas enters the adsorption tower through the final pressure-boosting regulating valve 18, the first pressure equalizing and final pressure-boosting pipeline 5 and the fifth program control valve 501 (the first pressure equalizing and final pressure-boosting program control valve) to boost the pressure of the adsorption tower T01 until the pressure of the adsorption tower T01 is balanced with the pressure of the product gas.
Table 4 example 3 timing sequence chart
Step (ii) of 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
T01 A A A A 1D 2FD 3FD 4FD PP1 PP2 D P P P P 4FR 3FR 2FR 1R FR
T02 1R FR A A A A 1D 2FD 3FD 4FD PP1 PP2 D P P P P 4FR 3FR 2FR
T03 3FR 2FR 1R FR A A A A 1D 2FD 3FD 4FD PP1 PP2 D P P P P 4FR
T04 P 4FR 3FR 2FR 1R FR A A A A 1D 2FD 3FD 4FD PP1 PP2 D P P P
T05 P P P 4FR 3FR 2FR 1R FR A A A A 1D 2FD 3FD 4FD PP1 PP2 D P
T06 D P P P P 4FR 3FR 2FR 1R FR A A A A 1D 2FD 3FD 4FD PP1 PP2
T07 PP1 PP2 D P P P P 4FR 3FR 2FR 1R FR A A A A 1D 2FD 3FD 4FD
T08 3FD 4FD PP1 PP2 D P P P P 4FR 3FR 2FR 1R FR A A A A 1D 2FD
T09 1D 2FD 3FD 4FD PP1 PP2 D P P P P 4FR 3FR 2FR 1R FR A A A A
T10 A A 1D 2FD 3FD 4FD PP1 PP2 D P P P P 4FR 3FR 2FR 1R FR A A
Note: a: adsorption step, 1D: a first pressure equalizing and reducing step, 2 FD: a second composite pressure equalizing and reducing step, 3 FD: a third composite pressure equalizing and reducing step, 4 FD: a fourth step of composite pressure equalizing and reducing, namely PP 1: step 1, PP 2: step 2, placing in sequence, D: reverse amplification step, P: washing step, 4 FR: a fourth composite voltage-equalizing and boosting step, 3 FR: a third composite voltage-equalizing and boosting step, 2 FR: a second composite voltage-equalizing and boosting step, 1R: a first voltage equalizing and boosting step, FR: and finally, a pressure rising step.
Finally, it should be noted that: the above embodiments are only preferred embodiments of the present invention to illustrate the technical solutions of the present invention, but not to limit the technical solutions, and certainly not to limit the patent scope of the present invention; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention; that is, the technical problems to be solved by the present invention, which are not substantially changed or supplemented by the spirit and the concept of the main body of the present invention, are still consistent with the present invention and shall be included in the scope of the present invention; in addition, the technical scheme of the invention is directly or indirectly applied to other related technical fields, and the technical scheme is included in the patent protection scope of the invention.

Claims (8)

1. The separation and purification method of the gas pressure swing adsorption separation and purification system is characterized in that the gas pressure swing adsorption separation and purification system comprises at least four adsorption towers (13), a raw material gas conveying pipeline (1) connected into the adsorption towers (13) and provided with a first program control valve 10X, a reverse-discharge flushing pipeline (2) provided with a second program control valve 20X, an adsorption tower inlet end second/third pressure equalizing pipeline (3) provided with a third program control valve 30X, an adsorption tower outlet end second/third pressure equalizing pipeline (4) connected out of the adsorption towers (13) and provided with a fourth program control valve 40X, a first pressure equalizing and final boosting pipeline (5) provided with a fifth program control valve 50X, a product gas external conveying pipeline (6) provided with a sixth program control valve 60X, and a regeneration pipeline connected into the adsorption towers (13) or connected out of the adsorption towers (13), the adsorption tower inlet end second/third pressure equalizing pipeline (3) and the adsorption tower outlet end second/third pressure equalizing pipeline (4) A first pipeline (14) is communicated between the first pressure equalizing and final boosting pipeline (5) and the product gas output pipeline (6) and is communicated through a final boosting adjusting valve (18), a flushing pipeline (7) provided with a seventh program control valve 70X is connected into the adsorption tower (13), and the pressure of the raw material gas in the mixed raw material gas conveying pipeline (1) is 1.0-7.0 MPa;
performing gas pressure swing adsorption separation and purification by adopting at least four adsorption towers through repeated circulation steps; each adsorption tower undergoes repeated circulation steps of adsorption, conventional pressure equalizing and reducing, composite pressure equalizing and reducing, forward discharging, reverse discharging, regeneration, composite pressure equalizing and boosting, conventional pressure equalizing and boosting and final boosting;
or, each adsorption tower undergoes repeated circulation steps of adsorption, conventional pressure equalizing and reducing, composite pressure equalizing and reducing, reverse releasing, evacuation and regeneration, composite pressure equalizing and boosting, conventional pressure equalizing and boosting and final boosting in sequence;
the pressure equalizing and reducing step and the pressure equalizing and increasing step correspond to each other, the pressure balance is realized by communicating the inlet and the outlet of the adsorption tower in the pressure equalizing and reducing step with the inlet of the adsorption tower in the pressure equalizing and increasing step, and the ratio k of the gas outflow time from the inlet of the adsorption tower to the gas outflow time from the outlet of the adsorption tower in the pressure equalizing and reducing step is 0< k < 1.
2. The separation and purification method according to claim 1, wherein the regeneration line comprises a flushing inlet line (8) connected to the adsorption tower (13) and provided with an eighth program control valve 80X, and a forward discharge line (9) provided with a ninth program control valve 90X, and the flushing inlet line (8) and the forward discharge line (9) are communicated with each other through a forward discharge regulating valve (15).
3. The separation and purification method according to claim 1, wherein the regeneration line comprises an evacuation line (10) connected to the adsorption tower (13) and provided with a tenth programmable valve 100X, and a vacuum pump (16) is provided on the evacuation line (10).
4. The separation and purification method according to claim 3, wherein at least two vacuum pumps (16) are provided, and the vacuum pumps (16) are connected in parallel to the evacuation line (10).
5. The separation and purification method according to claim 1, wherein a fourth/fifth pressure equalizing line (11) at the inlet end of the adsorption tower provided with an eleventh program control valve 110X is connected into the adsorption tower (13), a fourth/fifth pressure equalizing line (12) at the outlet end of the adsorption tower provided with a twelfth program control valve 120X is connected into the adsorption tower (13), and a second line (17) is communicated between the fourth/fifth pressure equalizing line (11) at the inlet end of the adsorption tower and the fourth/fifth pressure equalizing line (12) at the outlet end of the adsorption tower.
6. The separation and purification method according to claim 1, wherein the adsorption step is that the feed gas enters the adsorption tower from the inlet end of the adsorption tower in the adsorption step under the pressure of 1.0MPa to 7.0MPa, the strong adsorption component is adsorbed by the adsorbent, and the weak adsorption component flows out from the outlet end of the adsorption tower in the adsorption step;
the pressure equalizing and reducing step and the pressure equalizing and increasing step correspond to each other, and the adsorption tower in the conventional pressure equalizing and reducing step is communicated with the outlet of the adsorption tower in the conventional pressure equalizing and increasing step to realize pressure balance;
the sequential release step is that the pressure of the adsorption tower in the pressure reduction step is reduced along the direction of the air flow during adsorption, and released gas provides regenerated gas for the adsorption tower in the regeneration stage or is discharged as waste gas;
the reverse discharging step is that the gas in the adsorption tower in the reverse discharging step flows out of the adsorption tower in the reverse discharging step against the flow direction of the gas during adsorption until the pressure in the adsorption tower in the reverse discharging step is reduced to normal pressure;
and in the final pressure boosting step, the pressure of the adsorption tower is boosted to the adsorption working pressure by using the product gas or the raw material gas in the adsorption tower completing the pressure equalizing and boosting step.
7. The separation and purification process according to claim 1, wherein in the composite pressure equalizing and reducing step, the gas in the adsorption column in the composite pressure equalizing and reducing step flows out from both the outlet and inlet to perform pressure reduction at both ends, the gas flowing out from the adsorption column in the composite pressure equalizing and reducing step flows into the adsorption column from the inlet of the adsorption column in the composite pressure equalizing and reducing step to increase the pressure, the number of steps in the composite pressure equalizing and reducing step is 1 or more and less than the total number of pressure equalizing steps, and the ratio k of the gas flowing-out time from the inlet of the adsorption column to the gas flowing-out time from the outlet of the adsorption column in the composite pressure equalizing and reducing step is 0.2< k < 0.7.
8. The separation and purification method according to claim 1, wherein the regeneration step is a step in which the adsorption tower is subjected to adsorbent desorption at a low pressure, and the adsorption tower is subjected to flushing regeneration with a purge gas from the outlet end of the adsorption tower against the gas flow during adsorption;
the evacuation regeneration step is that the adsorption tower in the evacuation regeneration step completes the desorption of the adsorbent under low pressure, and a vacuum pump vacuumizes the adsorption tower in the evacuation regeneration step from the inlet end of the adsorption tower in the evacuation regeneration step to regenerate the adsorbent.
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