CN112041264A - Method of movable pressure swing adsorption oxygen production device - Google Patents

Method of movable pressure swing adsorption oxygen production device Download PDF

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Publication number
CN112041264A
CN112041264A CN202080001896.9A CN202080001896A CN112041264A CN 112041264 A CN112041264 A CN 112041264A CN 202080001896 A CN202080001896 A CN 202080001896A CN 112041264 A CN112041264 A CN 112041264A
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China
Prior art keywords
adsorption
pressure swing
oxygen
swing adsorption
section
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Chinese (zh)
Inventor
宋宇文
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Chengdu Yingchen Technology Co ltd
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Chengdu Yingchen Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/02Preparation of oxygen
    • C01B13/0229Purification or separation processes
    • C01B13/0248Physical processing only
    • C01B13/0259Physical processing only by adsorption on solids
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/02Separation 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
    • B01D53/04Separation 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
    • B01D53/047Pressure swing adsorption
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/26Drying gases or vapours
    • B01D53/261Drying gases or vapours by adsorption
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2256/00Main component in the product gas stream after treatment
    • B01D2256/12Oxygen
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/80Water
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2259/00Type of treatment
    • B01D2259/40Further details for adsorption processes and devices
    • B01D2259/40011Methods relating to the process cycle in pressure or temperature swing adsorption
    • B01D2259/40058Number of sequence steps, including sub-steps, per cycle
    • B01D2259/40062Four

Abstract

The invention provides a method of a movable pressure swing adsorption oxygen production device, which comprises a first pressure swing adsorption section and a second pressure swing adsorption section which are operated in series, wherein most of nitrogen in dry raw material air is adsorbed by a nitrogen balance selection type adsorbent bed layer of the first pressure swing adsorption section, oxygen-enriched mixed gas flows into a speed selection type adsorbent bed layer of the second pressure swing adsorption section, so that oxygen is adsorbed by the speed selection type adsorbent bed layer, and high-concentration oxygen is analyzed by the second pressure swing adsorption section; the adsorption tower of the first pressure swing adsorption section at least sequentially undergoes four steps of adsorption A, uniform pressure drop ED, reverse discharging BD or vacuumizing VC and uniform pressure rise ER in one cycle period; the adsorption tower of the second pressure swing adsorption section at least sequentially undergoes the steps of adsorption A, product oxygen replacement P, vacuumizing VC and series adsorption A1 in one cycle period. The pressure swing adsorption device adopting the method of the invention has small volume, light weight, convenient use and low pressure, greatly reduces the cost of oxygen consumption and obviously improves the safety of oxygen consumption.

Description

Method of movable pressure swing adsorption oxygen production device
Technical Field
The invention relates to the field of oxygen generation by pressure swing adsorption technology, in particular to a method of a movable pressure swing adsorption oxygen production device.
Background
At present, pure oxygen used in the gas cutting process is prepared by adopting a deep cooling device, then the pure oxygen is compressed to more than 12.5MPa by a compressor and is filled into a special 40-liter steel cylinder, and then the pure oxygen is transported to each user, and the using pressure of the user is lower than 0.95MPa, so that a large amount of manpower and material resources are consumed, the oxygen cost is high, and the safety is poor.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method for a mobile pressure swing adsorption oxygen production device with small volume, light weight, convenient use and low pressure, which can be started and stopped at any time, and can greatly reduce the cost and greatly improve the safety of oxygen. The purpose of the invention is realized by the following technical scheme:
a method for a movable pressure swing adsorption oxygen production device adopts two sections of pressure swing adsorption series operation, raw air without gaseous water firstly enters a nitrogen balance selection type adsorbent bed layer from the bottom of an adsorption tower of a first pressure swing adsorption section, most nitrogen in the raw air is adsorbed by the nitrogen balance selection type adsorbent bed layer, most oxygen and argon flow out from an outlet of the adsorption tower and enter a speed selection type adsorbent bed layer from the bottom of the adsorption tower of a second pressure swing adsorption section, oxygen enrichment is adsorbed by the speed selection type adsorbent bed layer, nitrogen, argon and a small amount of oxygen flow out from an outlet of the adsorption tower, and the analyzed mixed gas is high-concentration oxygen. The adsorption tower of the first pressure swing adsorption section sequentially undergoes four pressure swing adsorption process steps of adsorption A, uniform pressure drop ED, reverse discharging BD or vacuumizing VC and uniform pressure rise ER in one cycle period; the adsorption tower of the second pressure swing adsorption section sequentially undergoes the pressure swing adsorption process steps of adsorption A, product oxygen replacement P, vacuumizing VC and series adsorption A1 in a cycle period.
Further, the adsorption tower of the second pressure swing adsorption section is added with a series replacement P1 step after the adsorption A step, and replacement gas of the series replacement step comes from mixed gas discharged from the outlet of another adsorption tower in the product oxygen replacement P step.
Further, the adsorption tower of the first pressure swing adsorption section is added with a final pressure boosting FR step after the step of equalizing pressure and boosting ER, and the pressure boosting gas of the step comes from the outlet oxygen-enriched mixed gas of the step A of the adsorption tower of the first section.
Considering the situation that the raw air may contain gaseous water, in order to ensure the adsorption effect of the nitrogen balance selective adsorbent bed layer of the first pressure swing adsorption section, the raw air needs to be dried, and for this purpose, the invention provides two solutions:
scheme 1: the bottom of first section adsorption tower loads the drier, nitrogen balance selection type adsorbent bed is loaded on upper portion, when passing through from first section adsorption tower bottom in the raw materials air, its gaseous water is mostly adsorbed by the drier bed, most nitrogen gas is adsorbed by nitrogen balance selection type adsorbent bed, most oxygen and argon gas from the adsorption tower export flow out from the adsorption tower bottom entering speed selection type adsorbent bed of second pressure swing adsorption section, the oxygen boosting is adsorbed by speed selection type adsorbent bed, nitrogen gas and argon gas and a small amount of oxygen flow out from the adsorption tower export, the gas mixture of resolving out is high concentration oxygen.
Scheme 2: the pressure swing adsorption drying section is additionally arranged in front of the first pressure swing adsorption section and is used for removing gaseous water in the air so as to meet the requirement of the adsorption tower entering the first pressure swing adsorption section on moisture. The pressure swing adsorption drying section sequentially undergoes two pressure swing adsorption process steps of adsorption A and purging P in a cycle period, and gas in the purging P step is from vent gas at the outlet of the adsorption step A of an adsorption tower of the first pressure swing adsorption section and vent gas analyzed by an adsorption tower of the second pressure swing adsorption section. Active alumina is filled in the drying section to be used as a drying agent; a 5A type molecular sieve or an X type lithium molecular sieve is filled in the adsorption tower of the first pressure swing adsorption section to be used as a nitrogen balance selective adsorbent; the adsorption tower of the second pressure swing adsorption section is filled with a carbon molecular sieve as a velocity selective adsorbent.
Further, the pressure of the adsorption column in the step A of the first pressure swing adsorption section and the second pressure swing adsorption section is 0.005-0.2MPa (gauge pressure).
Further, the concentration of oxygen in the outlet gas at the end of the step A of adsorption by the adsorption tower of the first pressure swing adsorption section is 70-80% (V).
Further, the adsorption tower of the first pressure swing adsorption section is filled with a 5A type molecular sieve or an X type lithium molecular sieve; the adsorption tower of the second pressure swing adsorption section is filled with carbon molecular sieves.
The mobile pressure swing adsorption pure oxygen production device provided by the method greatly reduces the oxygen cost and greatly improves the safety, and the mobile pressure swing adsorption pure oxygen production device has small volume, light weight, convenient use and the highest pressure of only 1.2MPa, and can be started and stopped along with the start.
Drawings
FIG. 1 is a timing chart of the operation steps of each section of the adsorption tower and the on-off of the programmable valve in example 1 of the present invention.
FIG. 2 is a process flow diagram of example 1 of the present invention.
FIG. 3 is a timing chart of the operation steps of each section of the adsorption tower and the on-off of the programmable valve in example 2 of the present invention.
FIG. 4 is a process flow diagram of example 2 of the present invention.
FIG. 5 is a timing chart of the operation steps of each section of the adsorption tower and the on-off of the programmable valve in example 3 of the present invention.
FIG. 6 is a process flow diagram of example 3 of the present invention.
FIG. 7 is a timing chart of the operation steps of each section of the adsorption tower and the on-off of the programmable valve in example 4 of the present invention.
FIG. 8 is a process flow diagram of example 4 of the present invention.
Best mode for carrying out the invention
The following preferred embodiments of the present invention are described with reference to the accompanying drawings, and the following preferred embodiments are only provided to facilitate understanding of the technical solutions of the present invention, and should not be construed as limiting the scope of the claims of the present invention.
Example 1:
FIG. 1 is a timing chart of the operation steps of each section of the adsorption tower and the on-off of the programmable valve in example 1 of the present invention.
FIG. 2 is a process flow diagram of example 1 of the present invention.
The raw material air composition of this example is as follows:
composition of O2 N2 Ar CO2 Others
Concentration (%) (V) 20.93 78.03 0.932 0.03 0.078 100
Temperature: not more than 40 DEG C
Pressure: 0.05MPa (G)
As shown in fig. 2, a vacuum pump P0101, a vacuum buffer tank V0101, a programmable valve, a PLC control system, an instrument, a process pipeline fitting, an adsorption tower T0101A and a adsorption tower T0101B form a first pressure swing adsorption section, an adsorbent filled in the adsorption tower is a 5A molecular sieve or a lithium molecular sieve, and a single-tower adsorption, pressure equalization and vacuum pumping procedure is performed; the pure oxygen vacuum pump P0201, the pure oxygen compressor C0201, the oxygen-enriched buffer tank V0201, the compressor buffer tank V0202, the product pure oxygen buffer tank V0203, the program control valve, the PLC control system, instruments and meters, process pipeline pipe fittings, the adsorption tower T0201A, T0201B, T0201C and T0201D form a second pressure swing adsorption section, an adsorbent filled in the adsorption tower is a carbon molecular sieve, and a single-tower adsorption, replacement and vacuum-pumping program is operated. In this embodiment, the two pressure swing adsorption stages are operated in series, the first pressure swing adsorption stage adsorbs nitrogen in the air, and the second pressure swing adsorption stage is used to adsorb oxygen in the oxygen-enriched mixed gas obtained in the step a by the adsorption tower of the first pressure swing adsorption stage, and to increase the oxygen content to 99.5% (V) or more.
Dry air with the pressure greater than 5KPa enters an adsorption tower of a first pressure swing adsorption section in the adsorption step, an adsorbent in the adsorption tower selectively adsorbs components such as nitrogen in the air, components such as oxygen and argon which are difficult to adsorb are discharged from an outlet end and enter an adsorption tower which is adsorbing in the second pressure swing adsorption section, the adsorbent in the adsorption tower selectively adsorbs components such as oxygen in oxygen-enriched mixed gas, the components such as nitrogen and argon which are difficult to adsorb flow out from the outlet end and enter a second section of adsorption tower which is vacuumized to perform pressure boosting and oxygen adsorption, the pressure boosting is performed to the adsorption pressure, the oxygen is adsorbed and then the air is discharged. After the adsorption tower of first pressure swing adsorption section adsorbs, carries out the voltage-sharing earlier and evacuation again, and nitrogen gas and a small amount of oxygen evacuation that the vacuum pump extracted, after the adsorption tower of second pressure swing adsorption section adsorbs, replaces with product oxygen earlier, and after the replacement, carries out the evacuation, and the high concentration oxygen that extracts gets out gets into product pure oxygen buffer tank after the product process is compressed as product, and another part goes to replace the adsorbent bed after adsorbing. The concentration of oxygen in outlet gas in the adsorption process of an adsorption tower of the first pressure swing adsorption section is controlled to be more than 70 percent (V), and the adsorption tower sequentially undergoes four pressure swing adsorption process steps of adsorption A, pressure equalizing drop ED, vacuumizing VC and pressure equalizing rise in a cycle period; after the adsorption of the adsorption tower of the second pressure swing adsorption section is finished, the oxygen concentration in the outlet gas is controlled to be more than 60-70% (V), and the adsorption tower sequentially undergoes four pressure swing adsorption process steps of adsorption A, product oxygen replacement P, vacuumizing VC and series adsorption A1 in one cycle period. The total recovery rate of oxygen is about 60%, the two-stage circulation time is generally 20-80 seconds, the first stage vacuum degree is-0.07 MPa, and the air flow of a blower, the empty tower speed of two-stage adsorption towers, the air extraction amount of a vacuum pump, the dosage of an adsorbent, the diameter of the adsorption tower and other design parameters are designed according to the common conditions in the technical field of pressure swing adsorption.
Each adsorption column of each stage of the present invention is subjected to the following steps in sequence in one cycle.
The adsorption tower of the first pressure swing adsorption section: each adsorption column of the first stage is subjected to the following steps in sequence in one cycle:
first adsorption A
Opening the program control valve KV1A-1, allowing dry air with the pressure increased to 5KPa to enter an adsorption tower T0101A for pressure increase, opening the program control valve KV2A-1 when the pressure is increased to the adsorption pressure, allowing the adsorbent in the adsorption tower to selectively and sequentially adsorb components such as nitrogen in the air, allowing the components such as oxygen and argon which are not easy to adsorb to open the program control valve KV2A-1, discharging the components from an outlet end to enter an oxygen-enriched buffer tank V0201, controlling the concentration of the oxygen-enriched gas to be more than 70%, continuously increasing the total amount of nitrogen adsorbed by the adsorbent with the passage of time, stopping air intake when the adsorbent is saturated with the nitrogen, and ending the adsorption at the moment.
Do all pressure drop ED
And after the step A of adsorption is finished, opening the program control valve KV3A-1, discharging the gas in the dead space of the adsorption tower T0101A from the outlet of the adsorption tower, and allowing the gas to enter the adsorption tower T0101B which finishes the step VC of vacuumizing to be boosted, so that the pressures of the two towers are equal to each other as much as possible.
Vacuum pumping VC
And after the step of uniform pressure drop ED of the adsorption tower T0101A is finished, opening the program control valve KV4A-1, and extracting the nitrogen adsorbed in the adsorption tower T0101A for emptying.
All-round voltage sharing ER
After the step of vacuumizing VC of the adsorption tower T0101A is finished, opening the program control valve KV3A-1, and utilizing the uniform pressure drop ED step of the adsorption tower T0101B to discharge gas, wherein the gas enters the adsorption tower T0101A from the outlet end of the adsorption tower T0101A, so that the pressure of the adsorption tower T0101A is increased, and the pressures of the adsorption towers T0101A and T0101B are equal to each other as much as possible.
After the above steps, the adsorption tower T0101A completes one cycle and enters the raw material gas adsorption again, and the steps and sequence of the other adsorption tower are identical to those of the adsorption tower T0101A, but are staggered in time.
Second pressure swing adsorption stage
First adsorption A
Simultaneously opening program control valves KV1A-2 and KV4A-2 of the second pressure swing adsorption section, enabling the oxygen-rich mixed gas obtained in the step A to be adsorbed by the adsorption tower of the first pressure swing adsorption section to enter an adsorption bed layer of the adsorption tower T0201A from the bottom, enabling the adsorbent in the adsorption tower T0201A to selectively contain components such as oxygen in the oxygen-rich mixed gas, enabling unadsorbed partial oxygen and tail gas such as nitrogen and argon which are difficult to adsorb to flow out from an outlet end to enter the bottom of the adsorption tower T0201B to be boosted, opening the program control valve KV2B-2 when the adsorption pressure is increased, emptying the unadsorbed nitrogen and argon from an outlet of the adsorption tower T0201B, increasing the total amount of oxygen adsorbed by the adsorbent continuously along with the passage of time, stopping air intake when the adsorption tower T0201A is saturated with oxygen, and ending adsorption. After the step A of adsorption in the adsorption tower is finished, the concentration of oxygen in the outlet gas is controlled to be 60-70% (V).
Product of oxygen replacement P
And after the step A of adsorption is finished, closing the program control valves KV1A-2, KV4A-2 and KV2B-2, opening the program control valves KV3A-2 and KV6A-2, enabling product oxygen to enter the top of the adsorbent bed layer from the bottom of the adsorption tower T0201A and flow out, returning mixed gas flowing out from the top to an inlet of the first pressure swing adsorption section, mixing the mixed gas with the oxygen-enriched mixed gas obtained in the step A of adsorption of the adsorption tower of the first pressure swing adsorption section, and enabling the mixed gas to enter the adsorption tower of the second pressure swing adsorption section as raw material gas for adsorption. After the step of replacing the product oxygen of the adsorption tower by P is finished, the concentration of the oxygen in the outlet gas is controlled to be more than 98 percent (V).
Vacuum pumping VC
And after the product oxygen replacement P of the adsorption tower T0201A is finished, closing the program control valves KV3A-2 and KV6A-2, opening the program control valve KV5A-2, pumping out the oxygen adsorbed by the adsorbent from the bottom of the adsorption tower by using a vacuum pump, sending one part of the oxygen out as product oxygen, and returning the other part of the oxygen to replace the adsorbent bed as replacement gas.
Four series adsorption A1
After the adsorption tower T0201A finishes vacuumizing VC, closing the program control valve KV5A-2, opening the program control valves KV1D-2, KV4D-2 and KV2A-2, mixing oxygen-enriched raw material gas with tail gas flowing out from the top after oxygen replacement of products of the adsorption tower T0201C, then feeding the mixture into an adsorption tower T0201D adsorbent bed layer to adsorb oxygen, feeding the tail gas into the adsorption tower T0201A through the program control valve KV4D-2 to increase the pressure and adsorb oxygen, discharging nitrogen, argon and a small amount of oxygen which are difficult to adsorb through the program control valve KV2A-2, adsorbing the adsorption tower T0201D and the T1 0201A after serial adsorption is finished, and closing the program control valves KV1D-2, KV4D-2 and KV 2A-2. During the step of serially adsorbing A1 by the adsorption tower, the oxygen concentration in the outlet gas is controlled at 20-40% (V).
After the steps, the adsorption tower T0201A completes one cycle and enters the oxygen-enriched feed gas again for adsorption, and the steps and the sequence of the other three adsorption towers are completely the same as those of the adsorption tower T0201A and are only staggered in time.
Example 2:
FIG. 3 is a timing chart of the operation steps of each section of the adsorption tower and the on-off of the programmable valve in example 2 of the present invention.
FIG. 4 is a process flow diagram of example 2 of the present invention.
The raw material air composition of this example is as follows:
composition of O2 N2 Ar CO2 Others
Concentration (%) (V) 20.93 78.03 0.932 0.03 0.078 100
Temperature: not more than 40 DEG C
Pressure: 0.05MPa (G)
As shown in fig. 4, a vacuum pump P0101, a vacuum buffer tank V0101, a programmable valve, a PLC control system, an instrument, a process pipeline fitting, an adsorption tower T0101A and a adsorption tower T0101B form a first pressure swing adsorption section, an adsorbent filled in the adsorption tower is a 5A molecular sieve or a lithium molecular sieve, and a single-tower adsorption, pressure equalization and vacuum pumping procedure is performed; the pure oxygen vacuum pump P0201, the pure oxygen compressor C0201, the oxygen-enriched buffer tank V0201, the compressor buffer tank V0202, the product pure oxygen buffer tank V0203, the program control valve, the PLC control system, instruments and meters, process pipeline pipe fittings, the adsorption tower T0201A, T0201B, T0201C, T0201D and T0201E form a second pressure swing adsorption section, an adsorbent filled in the adsorption tower is a carbon molecular sieve, and single-tower series adsorption, series replacement and vacuum pumping procedures are operated. In this embodiment, the two pressure swing adsorption stages are operated in series, the first pressure swing adsorption stage adsorbs nitrogen in the air, and the second pressure swing adsorption stage is used to adsorb oxygen in the oxygen-enriched mixed gas obtained in the step a by the adsorption tower of the first pressure swing adsorption stage, and to increase the oxygen content to 99.5% (V) or more.
Dry air with the pressure greater than 5KPa enters an adsorption tower of a first pressure swing adsorption section in the adsorption step, an adsorbent in the adsorption tower selectively adsorbs components such as nitrogen in the air, components such as oxygen and argon which are difficult to adsorb are discharged from an outlet end and enter an adsorption tower which is adsorbing in the second pressure swing adsorption section, the adsorbent in the adsorption tower selectively adsorbs components such as oxygen in oxygen-enriched mixed gas, the components such as nitrogen and argon which are difficult to adsorb flow out from the outlet end and enter a second section of adsorption tower which is vacuumized to perform pressure boosting and oxygen adsorption, the pressure boosting is performed to the adsorption pressure, the oxygen is adsorbed and then the air is discharged. After adsorption of an adsorption tower of the first pressure swing adsorption section is finished, pressure equalization and vacuum pumping are firstly carried out, nitrogen and a small amount of oxygen pumped by a vacuum pump are discharged, the concentration of oxygen in outlet gas in the adsorption process of the adsorption tower is controlled to be more than 70 percent (V), and the adsorption tower sequentially undergoes four pressure swing adsorption process steps of adsorption A, pressure equalization ED, vacuum pumping VC and pressure equalization rising in a cycle period; the oxygen concentration of the outlet gas of the adsorption tower of the second pressure swing adsorption section in the adsorption step is controlled to be close to the oxygen concentration of the raw material gas, and the adsorption tower sequentially undergoes five pressure swing adsorption process steps of adsorption A, serial replacement P1, product oxygen replacement P, vacuumizing VC and serial adsorption A1 in one cycle period. The total recovery rate of oxygen is about 60%, the two-stage circulation time is generally 20-80 seconds, the first stage vacuum degree is-0.07 MPa, and the air flow of a blower, the empty tower speed of two-stage adsorption towers, the air extraction amount of a vacuum pump, the dosage of an adsorbent, the diameter of the adsorption tower and other design parameters are designed according to the common conditions in the technical field of pressure swing adsorption.
Each adsorption column of each stage of the present invention is subjected to the following steps in sequence in one cycle.
The adsorption tower of the first pressure swing adsorption section: each adsorption column of the first stage is subjected to the following steps in sequence in one cycle:
first adsorption A
Opening the program control valve KV1A-1, allowing dry air with the pressure increased to 5KPa to enter an adsorption tower T0101A for pressure increase, opening the program control valve KV2A-1 when the pressure is increased to the adsorption pressure, allowing the adsorbent in the adsorption tower to selectively and sequentially adsorb components such as nitrogen in the air, allowing the components such as oxygen and argon which are not easy to adsorb to open the program control valve KV2A-1, discharging the components from an outlet end to enter an oxygen-enriched buffer tank V0201, controlling the concentration of the oxygen-enriched gas to be more than 70%, continuously increasing the total amount of nitrogen adsorbed by the adsorbent with the passage of time, stopping air intake when the adsorbent is saturated with the nitrogen, and ending the adsorption at the moment.
Do all pressure drop ED
And after the step A of adsorption is finished, opening the program control valve KV3A-1, discharging the gas in the dead space of the adsorption tower T0101A from the outlet of the adsorption tower, and allowing the gas to enter the adsorption tower T0101B which finishes the step VC of vacuumizing to be boosted, so that the pressures of the two towers are equal to each other as much as possible.
Vacuum pumping VC
And after the step of uniform pressure drop ED of the adsorption tower T0101A is finished, opening the program control valve KV4A-1, and extracting the nitrogen adsorbed in the adsorption tower T0101A for emptying.
All-round voltage sharing ER
After the step of vacuumizing VC of the adsorption tower T0101A is finished, opening the program control valve KV3A-1, and utilizing the uniform pressure drop ED step of the adsorption tower T0101B to discharge gas, wherein the gas enters the adsorption tower T0101A from the outlet end of the adsorption tower T0101A, so that the pressure of the adsorption tower T0101A is increased, and the pressures of the adsorption towers T0101A and T0101B are equal to each other as much as possible.
After the above steps, the adsorption tower T0101A completes one cycle and enters the raw material gas adsorption again, and the steps and sequence of the other adsorption tower are identical to those of the adsorption tower T0101A, but are staggered in time.
Second pressure swing adsorption stage
First adsorption A
Simultaneously opening program control valves KV1A-2 and KV4A-2 of the second pressure swing adsorption section, enabling the oxygen-rich mixed gas obtained in the step A to be adsorbed by the adsorption tower of the first pressure swing adsorption section to enter an adsorption bed layer of the adsorption tower T0201A from the bottom, enabling the adsorbent in the adsorption tower T0201A to selectively contain components such as oxygen in the oxygen-rich mixed gas, enabling unadsorbed partial oxygen and tail gas such as nitrogen and argon which are difficult to adsorb to flow out from an outlet end to enter the bottom of the adsorption tower T0201B to be boosted, opening the program control valve KV2B-2 when the adsorption pressure is increased, emptying the unadsorbed nitrogen and argon from an outlet of the adsorption tower T0201B, increasing the total amount of the adsorbed oxygen of the adsorbent continuously along with the passage of time, stopping air intake when the adsorption tower T020 0201A is saturated with the oxygen, and ending the adsorption. After the step A of adsorption in the adsorption tower is finished, the concentration of oxygen in the outlet gas is controlled to be 60-70% (V).
The series replacement of P1
And after the step A of adsorption is finished, closing the program control valves KV1A-2, KV4A-2 and KV2B-2, opening the program control valves KV6E-2, KV3E-2 and KV2A-2, enabling product oxygen to enter an adsorbent bed from the bottom of the adsorption tower T0201E for replacing nitrogen and argon, then enabling the product oxygen to flow out from the top, enabling replacement tail gas flowing out from the top to enter from the bottom of the adsorption tower T0201A, adsorbing oxygen through the adsorbent bed of the adsorption tower T0201A, and returning to a second section inlet through the program control valve KV2A-2 to be mixed with oxygen-enriched gas obtained in the adsorption step of the adsorption tower in the first pressure swing adsorption section. After the adsorption tower serial replacement P1 step is finished, the oxygen concentration in the outlet gas is controlled to be 60-80% (V).
Oxygen replacement of the product of the three-step process P
After the step of serial replacement P1 is finished, closing the program control valves KV6E-2, KV3E-2 and KV2A-2, opening the program control valves KV3A-2 and KV6A-2, enabling product oxygen to enter an adsorbent bed from the bottom of the adsorption tower T0201A for replacement of nitrogen and argon, then enabling the product oxygen to flow out from the top, enabling replacement tail gas flowing out from the top to enter from the bottom of the adsorption tower T0201B, adsorbing oxygen through the adsorbent bed of the adsorption tower T0201B, and then emptying through the program control valve KV 2B-2. After the step of replacing the product oxygen of the adsorption tower by P is finished, the concentration of the oxygen in the outlet gas is controlled to be more than 98 percent (V).
Vacuumizing VC
And after the product oxygen replacement P of the adsorption tower T0201A is finished, closing the program control valves KV3A-2 and KV6A-2, opening the program control valve KV5A-2, pumping out the oxygen adsorbed by the adsorbent from the bottom of the adsorption tower by using a vacuum pump, sending one part of the oxygen out as product oxygen, and returning the other part of the oxygen to replace the adsorbent bed as replacement gas.
Fifth adsorption A1 in series
After the adsorption tower T0201A finishes vacuumizing VC, closing the program control valve KV5A-2, opening the program control valves KV1E-2, KV4E-2 and KV7A-2, enabling the oxygen-enriched raw material gas to firstly enter an adsorbent bed layer of the adsorption tower T0201E to adsorb oxygen, enabling tail gas to further enter the adsorption tower T0201A through the program control valve KV4E-2 to boost pressure and adsorb oxygen, and after the adsorption tower T0201E oxygen-enriched adsorption and T0201A serial adsorption are finished, closing the program control valves KV1E-2, KV4E-2 and KV 7A-2.
After the steps, the adsorption tower T0201A completes one cycle and enters the oxygen-enriched feed gas again for adsorption, and the steps and the sequence of the other four adsorption towers are completely the same as those of the adsorption tower T0201A and are only staggered in time.
Example 3:
FIG. 5 is a timing chart of the operation steps of each section of the adsorption tower and the on-off of the programmable valve in example 3 of the present invention.
FIG. 6 is a process flow diagram of example 3 of the present invention.
The raw material air composition of this example is as follows:
composition of O2 N2 Ar CO2 Others
Concentration (%) (V) 20.93 78.03 0.932 0.03 0.078 100
Temperature: not more than 40 DEG C
Pressure: 0.05MPa (G)
As shown in fig. 6, a vacuum pump P0101, a vacuum buffer tank V0101, a programmable valve, a PLC control system, an instrument, a process piping tube, an adsorption tower T0101A, a adsorption tower T0101B, and an adsorption tower T0101C form a first pressure swing adsorption section, an adsorbent filled in the adsorption tower is a 5A molecular sieve or a lithium molecular sieve, and a single-tower adsorption, pressure equalization and vacuum pumping procedure is performed; the pure oxygen vacuum pump P0201, the pure oxygen compressor C0201, the compressor buffer tank V0202, the product pure oxygen buffer tank V0203, the program control valve, the PLC control system, the instruments and meters, the process pipeline pipe fittings, the adsorption towers T0201A, T0201B, T0201C and T0201D form a second pressure swing adsorption section, an adsorbent filled in the adsorption towers is a carbon molecular sieve, and a single-tower adsorption, replacement and vacuum-pumping procedure is operated. In this embodiment, the two pressure swing adsorption stages are operated in series, the first pressure swing adsorption stage adsorbs nitrogen in the air, and the second pressure swing adsorption stage is used to adsorb oxygen in the oxygen-enriched mixed gas obtained in the step a by the adsorption tower of the first pressure swing adsorption stage, and to increase the oxygen content to 99.5% (V) or more.
Dry air with the pressure greater than 5KPa enters an adsorption tower of a first pressure swing adsorption section in the adsorption step, an adsorbent in the adsorption tower selectively adsorbs components such as nitrogen in the air, components such as oxygen and argon which are difficult to adsorb are discharged from an outlet end and enter an adsorption tower which is adsorbing in the second pressure swing adsorption section, the adsorbent in the adsorption tower selectively adsorbs components such as oxygen in oxygen-enriched mixed gas, the components such as nitrogen and argon which are difficult to adsorb flow out from the outlet end and enter a second section of adsorption tower which is vacuumized to perform pressure boosting and oxygen adsorption, the pressure boosting is performed to the adsorption pressure, the oxygen is adsorbed and then the air is discharged. After the adsorption tower of first pressure swing adsorption section adsorbs, carries out the voltage-sharing earlier and evacuation again, and nitrogen gas and a small amount of oxygen evacuation that the vacuum pump extracted, after the adsorption tower of second pressure swing adsorption section adsorbs, replaces with product oxygen earlier, and after the replacement, carries out the evacuation, and the high concentration oxygen that extracts gets out gets into product pure oxygen buffer tank after the product process is compressed as product, and another part goes to replace the adsorbent bed after adsorbing. The concentration of oxygen in outlet gas in the adsorption process of an adsorption tower of the first pressure swing adsorption section is controlled to be more than 70 percent (V), and the adsorption tower sequentially undergoes five pressure swing adsorption process steps of adsorption A, pressure equalizing drop ED, vacuumizing VC, pressure equalizing rise ER and repressurization FR in a cycle period; after the adsorption of the adsorption tower of the second pressure swing adsorption section is finished, the oxygen concentration in the outlet gas is controlled to be more than 60-70% (V), and the adsorption tower sequentially undergoes four pressure swing adsorption process steps of adsorption A, product oxygen replacement P, vacuumizing VC and series adsorption A1 in one cycle period. The total recovery rate of oxygen is about 60%, the two-stage circulation time is generally 20-80 seconds, the first stage vacuum degree is-0.07 MPa, and the air flow of a blower, the empty tower speed of two-stage adsorption towers, the air extraction amount of a vacuum pump, the dosage of an adsorbent, the diameter of the adsorption tower and other design parameters are designed according to the common conditions in the technical field of pressure swing adsorption.
Each adsorption column of each stage of the present invention is subjected to the following steps in sequence in one cycle.
The adsorption tower of the first pressure swing adsorption section: each adsorption column of the first stage is subjected to the following steps in sequence in one cycle:
first adsorption A
Opening program control valves KV1A-1 and KV2A-1 of the first pressure swing adsorption section, enabling dry air to enter an adsorption bed layer of the adsorption tower T0101A from the bottom, enabling an adsorbent in the adsorption tower T0101A to selectively contain components such as nitrogen, enabling unadsorbed part of nitrogen and oxygen and argon which are not easy to adsorb to flow out of an outlet end and enter the adsorption tower of the second pressure swing adsorption section in the adsorption step, enabling the total amount of the components such as nitrogen adsorbed by the adsorbent to be increased continuously along with the lapse of time, stopping air inflow when the adsorption tower T0101A adsorbs nitrogen to be saturated, and ending adsorption at the moment. During the step A of adsorption in the adsorption tower, the oxygen concentration in the outlet gas is controlled to be more than 70 percent (V).
Do all pressure drop ED
And after the step A of adsorption is finished, opening the program control valves KV3A-1 and KV3C-1, discharging the gas in the dead space of the adsorption tower T0101A from the outlet of the adsorption tower, and allowing the gas to enter the adsorption tower T0101C which finishes the step VC of vacuumizing to be pressurized, so that the pressures of the two towers are equal to each other as much as possible.
Vacuum pumping VC
And after the equal pressure drop ED of the adsorption tower T0101A is finished, opening the program control valve KV4A-1, extracting the nitrogen adsorbed in the adsorption tower T0101A for emptying, and regenerating the adsorbent.
All-round voltage sharing ER
After the step of vacuumizing VC of the adsorption tower T0101A is finished, opening program control valves KV3A-1 and KV3B-1, and utilizing the uniform pressure drop ED of the adsorption tower T0101B to discharge gas from the step of discharging gas into the adsorption tower from the outlet end of the adsorption tower T0101A so as to increase the pressure of the adsorption tower T0101A and ensure that the pressures of the adsorption towers T0101A and T0101B are equal to each other as much as possible.
Fifthly final step-up FR
And after the ER is increased in an equalizing mode, closing the program control valve KV3A-1, opening the program control valve KV2A-1, and increasing the pressure of the adsorption tower T0101A by using outlet gas in the adsorption process until the pressure is close to the adsorption pressure of the first pressure swing adsorption section.
After the above steps, the adsorption tower T0101A completes one cycle and enters the raw material gas adsorption again, and the steps and sequence of the other adsorption tower are identical to those of the adsorption tower T0101A, but are staggered in time.
Second pressure swing adsorption stage
First adsorption A
Simultaneously opening program control valves KV1A-2 and KV4A-2 of the second pressure swing adsorption section, enabling the oxygen-rich mixed gas obtained in the step A to be adsorbed by the adsorption tower of the first pressure swing adsorption section to enter an adsorption bed layer of the adsorption tower T0201A from the bottom, enabling the adsorbent in the adsorption tower T0201A to selectively contain components such as oxygen in the oxygen-rich mixed gas, enabling unadsorbed partial oxygen and tail gas such as nitrogen and argon which are difficult to adsorb to flow out from an outlet end to enter the bottom of the adsorption tower T0201B to be boosted, opening the program control valve KV2B-2 when the adsorption pressure is increased, emptying the unadsorbed nitrogen and argon from an outlet of the adsorption tower T0201B, increasing the total amount of oxygen adsorbed by the adsorbent continuously along with the passage of time, stopping air intake when the adsorption tower T0201A is saturated with oxygen, and ending adsorption. After the step A of adsorption in the adsorption tower is finished, the concentration of oxygen in the outlet gas is controlled to be 60-70% (V).
Product of oxygen replacement P
And after the step A of adsorption is finished, closing the program control valves KV1A-2, KV4A-2 and KV2B-2, opening the program control valves KV3A-2 and KV6A-2, enabling product oxygen to enter the top of the adsorbent bed layer from the bottom of the adsorption tower T0201A and flow out, returning mixed gas flowing out from the top to an inlet of the first pressure swing adsorption section, mixing the mixed gas with the oxygen-enriched mixed gas obtained in the step A of adsorption of the adsorption tower of the first pressure swing adsorption section, and enabling the mixed gas to enter the adsorption tower of the second pressure swing adsorption section as raw material gas for adsorption. After the step of replacing the product oxygen of the adsorption tower by P is finished, the concentration of the oxygen in the outlet gas is controlled to be more than 98 percent (V).
Vacuum pumping VC
And after the product oxygen replacement P of the adsorption tower T0201A is finished, closing the program control valves KV3A-2 and KV6A-2, opening the program control valve KV5A-2, pumping out the oxygen adsorbed by the adsorbent from the bottom of the adsorption tower by using a vacuum pump, sending one part of the oxygen out as product oxygen, and returning the other part of the oxygen to replace the adsorbent bed as replacement gas.
Four series adsorption A1
After the adsorption tower T0201A finishes vacuumizing VC, closing the program control valve KV5A-2, opening the program control valves KV1D-2, KV4D-2 and KV2A-2, mixing oxygen-enriched raw material gas with tail gas flowing out from the top after oxygen replacement of products of the adsorption tower T0201C, then feeding the mixture into an adsorption tower T0201D adsorbent bed layer to adsorb oxygen, feeding the tail gas into the adsorption tower T0201A through the program control valve KV4D-2 to increase the pressure and adsorb oxygen, discharging nitrogen, argon and a small amount of oxygen which are difficult to adsorb through the program control valve KV2A-2, adsorbing the adsorption tower T0201D and the T1 0201A after serial adsorption is finished, and closing the program control valves KV1D-2, KV4D-2 and KV 2A-2. During the step of serially adsorbing A1 by the adsorption tower, the oxygen concentration in the outlet gas is controlled at 20-40% (V).
After the steps, the adsorption tower T0201A completes one cycle and enters the oxygen-enriched feed gas again for adsorption, and the steps and the sequence of the other three adsorption towers are completely the same as those of the adsorption tower T0201A and are only staggered in time.
Example 4:
FIG. 7 is a timing chart of the operation steps of each section of the adsorption tower and the on-off of the programmable valve in example 4 of the present invention.
FIG. 8 is a process flow diagram of example 4 of the present invention.
The raw material air composition of this example is as follows:
composition of O2 N2 Ar CO2 Others
Concentration (%) (V) 20.93 78.03 0.932 0.03 0.078 100
Temperature: not more than 40 DEG C
Pressure: 0.05MPa (G)
As shown in fig. 8, a drying section pressure swing adsorption is composed of a blower C0100, a programmable valve, a PLC control system, an instrument, a process pipe fitting, an adsorption tower T0100A and an adsorption tower T0100B, an adsorbent filled in the adsorption tower is an activated alumina desiccant, and a single-tower adsorption and purging regeneration procedure is performed; a vacuum pump P0101, a vacuum buffer tank V0101, a program control valve, a PLC control system, instruments, process pipeline fittings, an adsorption tower T0101A and an adsorption tower T0101B form a first pressure swing adsorption section, an adsorbent filled in the adsorption tower is a 5A molecular sieve or a lithium molecular sieve, and a single-tower adsorption, pressure equalizing and vacuumizing procedure is operated; the pure oxygen vacuum pump P0201, the pure oxygen compressor C0201, the oxygen-enriched buffer tank V0201, the compressor buffer tank V0202, the product pure oxygen buffer tank V0203, the program control valve, the PLC control system, instruments and meters, process pipeline pipe fittings, the adsorption tower T0201A, T0201B, T0201C and T0201D form a second pressure swing adsorption section, an adsorbent filled in the adsorption tower is a carbon molecular sieve, and a single-tower adsorption, replacement and vacuum-pumping program is operated. In this embodiment, the three pressure swing adsorption stages are connected in series, the drying stage is used to adsorb gaseous water in the air, so as to meet the requirement of the pressure swing adsorption oxygen production adsorbent on water, the first pressure swing adsorption stage adsorbs nitrogen in the air, and the second pressure swing adsorption stage is used to adsorb oxygen in the oxygen-enriched mixed gas obtained in the step a by the first pressure swing adsorption stage adsorption tower, and to increase the oxygen content to more than 99.5% (V).
Air is pressurized to 5KPa through a blower C0100 and then enters a drying section pressure swing adsorption, an adsorbent in an adsorption tower selectively adsorbs components such as gaseous water in wet air, components such as oxygen, nitrogen and argon which are difficult to adsorb enter the adsorption tower in the adsorption step of a first pressure swing adsorption section from an outlet end, the adsorbent in the adsorption tower selectively adsorbs components such as nitrogen in the air, the components such as oxygen and argon which are difficult to adsorb are discharged from an outlet end and enter the adsorption tower which is being adsorbed in a second pressure swing adsorption section, the adsorbent in the adsorption tower selectively adsorbs components such as oxygen in oxygen-enriched mixed gas, the components such as nitrogen and argon which are difficult to adsorb flow out from the outlet end and enter a second section of adsorption tower which is vacuumized to be pressurized and adsorb oxygen, and the pressurized components are pressurized to adsorption pressure and are exhausted after adsorbing oxygen. After the adsorption tower of first pressure swing adsorption section adsorbs, carries out the voltage-sharing earlier and evacuation again, and nitrogen gas and a small amount of oxygen evacuation that the vacuum pump extracted, after the adsorption tower of second pressure swing adsorption section adsorbs, replaces with product oxygen earlier, and after the replacement, carries out the evacuation, and the high concentration oxygen that extracts gets out gets into product pure oxygen buffer tank after the product process is compressed as product, and another part goes to replace the adsorbent bed after adsorbing. The drying section pressure swing adsorption is used for controlling the dew point of the wet air to be more than 50 ℃ below zero, and the adsorption tower of the drying section pressure swing adsorption sequentially undergoes two pressure swing adsorption process steps of adsorption A and purging P in a cycle period; the concentration of oxygen in outlet gas in the adsorption process of an adsorption tower of the first pressure swing adsorption section is controlled to be more than 70 percent (V), and the adsorption tower sequentially undergoes four pressure swing adsorption process steps of adsorption A, pressure equalizing drop ED, vacuumizing VC and pressure equalizing rise in a cycle period; after the adsorption of the adsorption tower of the second pressure swing adsorption section is finished, the oxygen concentration in the outlet gas is controlled to be more than 60-70% (V), and the adsorption tower sequentially undergoes four pressure swing adsorption process steps of adsorption A, product oxygen replacement P, vacuumizing VC and series adsorption A1 in one cycle period. The total recovery rate of oxygen is about 60 percent, the three-section circulation time is generally 20-80 seconds, the first section vacuum degree is-0.07 MPa, and the air flow of a blower, the empty tower speed of the three-section adsorption tower, the air extraction amount of a vacuum pump, the using amount of an adsorbent, the diameter of the adsorption tower and other design parameters are designed according to the common conditions in the technical field of pressure swing adsorption.
Each adsorption column of each stage of the present invention is subjected to the following steps in sequence in one cycle.
Pressure swing adsorption drying section
First adsorption A
Opening program control valves KV1A-0 and KV2A-0, boosting raw material air to 5KPa (G) through a blower (C0101), then entering an active alumina bed layer from the bottom of an adsorption tower T0100A, adsorbing gaseous water in the air, discharging components such as oxygen, nitrogen and argon which are difficult to adsorb from an outlet end, entering the bottom of the adsorption tower of a first pressure swing adsorption section, increasing the total amount of the gaseous water adsorbed by the active alumina continuously along with the lapse of time, stopping air intake when the active alumina is saturated with the gaseous water, finishing adsorption at the moment, and controlling the dew point of the outlet mixed gas in the step A to be about-50 ℃ again in the pressure swing adsorption drying section.
Well sweep
After adsorption of the adsorption tower T0100A is finished, the program control valves KV3A-0 and KV4A-0 are opened, the vent gas in the step A of adsorption tower adsorption of the first pressure swing adsorption section and the step A1 of tail gas adsorption and the vent gas in the step A2 of adsorption tower air adsorption of the second pressure swing adsorption section enter the adsorption tower from the outlet end of the adsorption tower T0100A through the program control valve KV3A-0, then the vent gas is discharged from the bottom of the adsorption tower T0100A through the program control valve KV4A-0, and after purging P is finished, the program control valves KV3A-0 and KV4A-0 are closed.
After the above steps, the adsorption tower T0100A completes one cycle and re-enters the dry air adsorption, and the steps and sequence of the other adsorption tower are identical to those of the adsorption tower T0100A, but are staggered in time.
The adsorption tower of the first pressure swing adsorption section: each adsorption column of the first stage is subjected to the following steps in sequence in one cycle:
first adsorption A
Opening the program control valve KV1A-1, allowing dry air with the pressure increased to 5KPa to enter an adsorption tower T0101A for pressure increase, opening the program control valve KV2A-1 when the pressure is increased to the adsorption pressure, allowing the adsorbent in the adsorption tower to selectively and sequentially adsorb components such as nitrogen in the air, allowing the components such as oxygen and argon which are not easy to adsorb to open the program control valve KV2A-1, discharging the components from an outlet end to enter an oxygen-enriched buffer tank V0201, controlling the concentration of the oxygen-enriched gas to be more than 70%, continuously increasing the total amount of nitrogen adsorbed by the adsorbent with the passage of time, stopping air intake when the adsorbent is saturated with the nitrogen, and ending the adsorption at the moment.
Do all pressure drop ED
And after the step A of adsorption is finished, opening the program control valve KV3A-1, discharging the gas in the dead space of the adsorption tower T0101A from the outlet of the adsorption tower, and allowing the gas to enter the adsorption tower T0101B which finishes the step VC of vacuumizing to be boosted, so that the pressures of the two towers are equal to each other as much as possible.
Vacuum pumping VC
And after the step of uniform pressure drop ED of the adsorption tower T0101A is finished, opening the program control valve KV4A-1, and extracting the nitrogen adsorbed in the adsorption tower T0101A for emptying.
All-round voltage sharing ER
After the step of vacuumizing VC of the adsorption tower T0101A is finished, opening the program control valve KV3A-1, and utilizing the uniform pressure drop ED step of the adsorption tower T0101B to discharge gas, wherein the gas enters the adsorption tower T0101A from the outlet end of the adsorption tower T0101A, so that the pressure of the adsorption tower T0101A is increased, and the pressures of the adsorption towers T0101A and T0101B are equal to each other as much as possible.
After the above steps, the adsorption tower T0101A completes one cycle and enters the raw material gas adsorption again, and the steps and sequence of the other adsorption tower are identical to those of the adsorption tower T0101A, but are staggered in time.
Second pressure swing adsorption stage
First adsorption A
Simultaneously opening program control valves KV1A-2 and KV4A-2 of the second pressure swing adsorption section, enabling the oxygen-rich mixed gas obtained in the step A to be adsorbed by the adsorption tower of the first pressure swing adsorption section to enter an adsorption bed layer of the adsorption tower T0201A from the bottom, enabling the adsorbent in the adsorption tower T0201A to selectively contain components such as oxygen in the oxygen-rich mixed gas, enabling unadsorbed partial oxygen and tail gas such as nitrogen and argon which are difficult to adsorb to flow out from an outlet end to enter the bottom of the adsorption tower T0201B to be boosted, opening the program control valve KV2B-2 when the adsorption pressure is increased, emptying the unadsorbed nitrogen and argon from an outlet of the adsorption tower T0201B, increasing the total amount of oxygen adsorbed by the adsorbent continuously along with the passage of time, stopping air intake when the adsorption tower T0201A is saturated with oxygen, and ending adsorption. After the step A of adsorption in the adsorption tower is finished, the concentration of oxygen in the outlet gas is controlled to be 60-70% (V).
Product of oxygen replacement P
And after the step A of adsorption is finished, closing the program control valves KV1A-2, KV4A-2 and KV2B-2, opening the program control valves KV3A-2 and KV6A-2, enabling product oxygen to enter the top of the adsorbent bed layer from the bottom of the adsorption tower T0201A and flow out, returning mixed gas flowing out from the top to an inlet of the first pressure swing adsorption section, mixing the mixed gas with the oxygen-enriched mixed gas obtained in the step A of adsorption of the adsorption tower of the first pressure swing adsorption section, and enabling the mixed gas to enter the adsorption tower of the second pressure swing adsorption section as raw material gas for adsorption. After the step of replacing the product oxygen of the adsorption tower by P is finished, the concentration of the oxygen in the outlet gas is controlled to be more than 98 percent (V).
Vacuum pumping VC
And after the product oxygen replacement P of the adsorption tower T0201A is finished, closing the program control valves KV3A-2 and KV6A-2, opening the program control valve KV5A-2, pumping out the oxygen adsorbed by the adsorbent from the bottom of the adsorption tower by using a vacuum pump, sending one part of the oxygen out as product oxygen, and returning the other part of the oxygen to replace the adsorbent bed as replacement gas.
Four series adsorption A1
After the adsorption tower T0201A finishes vacuumizing VC, closing the program control valve KV5A-2, opening the program control valves KV1D-2, KV4D-2 and KV2A-2, mixing oxygen-enriched raw material gas with tail gas flowing out from the top after oxygen replacement of products of the adsorption tower T0201C, then feeding the mixture into an adsorption tower T0201D adsorbent bed layer to adsorb oxygen, feeding the tail gas into the adsorption tower T0201A through the program control valve KV4D-2 to increase the pressure and adsorb oxygen, discharging nitrogen, argon and a small amount of oxygen which are difficult to adsorb through the program control valve KV2A-2, adsorbing the adsorption tower T0201D and the T1 0201A after serial adsorption is finished, and closing the program control valves KV1D-2, KV4D-2 and KV 2A-2. During the step of serially adsorbing A1 by the adsorption tower, the oxygen concentration in the outlet gas is controlled at 20-40% (V).
After the steps, the adsorption tower T0201A completes one cycle and enters the oxygen-enriched feed gas again for adsorption, and the steps and the sequence of the other three adsorption towers are completely the same as those of the adsorption tower T0201A and are only staggered in time.

Claims (9)

1. A method for a movable pressure swing adsorption oxygen production device is characterized by comprising a first pressure swing adsorption section and a second pressure swing adsorption section which are operated in series, dry raw air firstly enters a nitrogen balance selection type adsorbent bed layer in an adsorption tower of the first pressure swing adsorption section, so that most of nitrogen is adsorbed by the nitrogen balance selection type adsorbent bed layer, most of oxygen and argon flow into the adsorption tower of the second pressure swing adsorption section from an outlet of the adsorption tower and pass through the speed selection type adsorbent bed layer of the second pressure swing adsorption section, oxygen in oxygen-rich mixed gas is adsorbed by the speed selection type adsorbent bed layer of the second pressure swing adsorption section, nitrogen, argon and a small amount of oxygen flow out from the outlet of the adsorption tower, and mixed gas analyzed by the second pressure swing adsorption section is high-concentration oxygen; the adsorption tower of the first pressure swing adsorption section at least sequentially undergoes four pressure swing adsorption process steps of adsorption A, pressure equalizing drop ED, reverse discharging BD or vacuumizing VC and pressure equalizing rise ER in a cycle period; the adsorption tower of the second pressure swing adsorption section at least sequentially undergoes the pressure swing adsorption process steps of adsorption A, product oxygen replacement P, vacuumizing VC and series adsorption A1 in one cycle period.
2. The process of claim 1, wherein the adsorption column of the second pressure swing adsorption stage is supplemented with a series displacement P1 step after the adsorption step A, and the displacement gas of the series displacement P1 step is derived from the mixed gas discharged from the outlet of another adsorption column in the product oxygen displacement P step.
3. The method of claim 1 or 2, wherein the adsorption column of the first pressure swing adsorption stage is added with a final pressure raising FR step after the step of pressure equalizing and raising ER, and the pressure raising gas of the final pressure raising FR step is from the outlet oxygen-enriched mixture of the adsorption A step of the first stage adsorption column.
4. The method of moving PSA oxygen production apparatus according to any one of claims 1 to 3, wherein the bottom of the adsorption column of the first PSA section is filled with a desiccant, the top thereof is filled with a nitrogen equilibrium-selective adsorbent bed, the raw air containing gaseous water is introduced from the bottom of the adsorption column of the first PSA section and sequentially passes through the desiccant bed and the nitrogen equilibrium-selective adsorbent bed, most of the gaseous water in the raw air is adsorbed by the desiccant bed, most of the nitrogen is adsorbed by the nitrogen equilibrium-selective adsorbent bed, most of the oxygen and argon are discharged from the outlet of the adsorption column and introduced into the velocity-selective adsorbent bed of the second PSA section from the bottom of the adsorption column, the oxygen in the oxygen-rich gas is adsorbed by the velocity-selective adsorbent bed, and nitrogen and argon and a small amount of oxygen are discharged from the outlet of the adsorption column, the mixed gas obtained by desorption is high-concentration oxygen.
5. The process for a mobile pressure swing adsorption oxygen production plant according to any one of claims 1 to 4 wherein the pressure in the adsorption column adsorption step A of the first pressure swing adsorption section and the second pressure swing adsorption section is 0.005 to 0.2MPa (gauge).
6. The process for the mobile pressure swing adsorption oxygen production plant of any one of claims 1 to 5 wherein the concentration of oxygen in the off-gas at the end of adsorption step A of the adsorption column of the first pressure swing adsorption section is 70 to 80% (V).
7. The method of a mobile pressure swing adsorption oxygen production plant of any one of claims 1 to 3 wherein the adsorption column of the first pressure swing adsorption stage is packed with a type 5A molecular sieve or a type X lithium molecular sieve as a nitrogen equilibrium selective adsorbent; the adsorption tower of the second pressure swing adsorption section is filled with a carbon molecular sieve as a velocity selective adsorbent.
8. The method of any one of claims 1 to 3 and 5 to 7, wherein a pressure swing adsorption drying section is added before the first pressure swing adsorption section for removing gaseous water from the feed air to meet the moisture requirement of the adsorption tower entering the first pressure swing adsorption section; the pressure swing adsorption drying section at least sequentially undergoes two pressure swing adsorption process steps of adsorption A and purging P in a cycle period, and gas in the purging P step is from vent gas at the outlet of the adsorption step A of an adsorption tower of a first pressure swing adsorption section and vent gas analyzed by an adsorption tower of a second pressure swing adsorption section.
9. The method of claim 8, wherein the drying section is filled with activated alumina as a desiccant; a 5A type molecular sieve or an X type lithium molecular sieve is filled in the adsorption tower of the first pressure swing adsorption section to be used as a nitrogen balance selective adsorbent; the adsorption tower of the second pressure swing adsorption section is filled with a carbon molecular sieve as a velocity selective adsorbent.
CN202080001896.9A 2020-04-14 2020-04-14 Method of movable pressure swing adsorption oxygen production device Pending CN112041264A (en)

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