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Air separation purification pressure equalizing system and control method

A control method and air separation technology, applied in separation methods, chemical instruments and methods, liquefaction, etc., can solve the problems of fluctuating gas conditions, affecting the air separation rectification process, and interfering with the process conditions of the air separation cold box, so as to reduce disturbances. , The effect of stabilizing process conditions and reducing equipment investment

Inactive Publication Date: 2020-02-14
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the technical scheme of using dry nitrogen in the pressure equalization step of the adsorber proposed by US2017276428 still has the problem of affecting the air separation rectification process. This is because the adsorber after the pressure equalization step is about to enter the adsorption stage. The gas composition of the air separation cold box is gradually converted from dry nitrogen to dry air, so that the conditions of the gas participating in the rectification in the downstream air separation cold box (especially the rectification tower) fluctuate, which interferes with the process conditions of the air separation cold box

Method used

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  • Air separation purification pressure equalizing system and control method

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Embodiment 1

[0037] The working process of the present invention will be described in detail below with the first adsorber in the adsorption stage and the second adsorber equalizing pressure (regeneration stage).

[0038] When the first adsorber R01 is in the adsorption stage and the second adsorber R02 is in the regeneration stage, the first air inlet valve 01 and the first air outlet valve 03 are open, and the other valves are closed. When the program controlled by the DCS switches the running time to the pressure equalization step of the second adsorber R02, the DCS slowly opens (slope control) the pressure equalization valve 05, and sends part of the dry air from the first adsorber R01 through the pressure equalization valve 05 to The second adsorber R02 increases the pressure of the second adsorber R02; DCS opens the switch valve 08 on the pressurized gas pipeline Lc at the same time; The flow loss of the dry air of the cold box, and adjust the opening degree of the control valve 07 o...

Embodiment 2

[0040] The working process of the present invention will be described in detail below with the first adsorber equalizing pressure (regeneration stage) and the second adsorber being in the adsorption stage.

[0041] When the first adsorber R01 is in the regeneration stage and the second adsorber R02 is in the adsorption stage, the second air inlet valve 02 and the second air outlet valve 04 are open, and other valves are closed. When the program controlled by the DCS switches the running time to the pressure equalization step of the first adsorber R01, the DCS slowly opens (slope control) the pressure equalization valve 05, and sends part of the dry air from the second adsorber R02 through the pressure equalization valve 05 to The first adsorber R01 increases the pressure of the first adsorber R01; DCS opens the switch valve 08 on the pressurized gas pipeline Lc at the same time; The flow loss of the dry air of the cold box, and adjust the opening degree of the control valve 07...

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Abstract

The invention discloses an air separation purification pressure equalizing system and a control method. The air separation purification pressure equalizing system comprises a first air main pipe; a pressurized gas pipeline which is connected with the first air main pipe and is used for receiving pressurized gas and conveying the pressurized gas to the first air main pipe; and a control valve whichis positioned on the pressurized gas pipeline, wherein the opening degree of the control valve is regulated and controlled by a flow regulator, so that the gas inflow of the pressurized gas pipelineis regulated and controlled. According to the air separation purification pressure equalizing system, the problem that the air separation rectification process is influenced when dry nitrogen is usedfor equalizing the pressure of an adsorber is solved; in the conversion process from a regeneration stage to an adsorption stage, pressurized dry nitrogen used in the previous pressure equalizing stepis mixed with wet air from a main air compressor and then an obtained mixture is introduced into the adsorber, the gas component flowing to an air separation cold box is basically kept unchanged, sothat disturbance to the condition of gas entering the rectifying tower and participating in rectification due to the fact that the gas component is gradually converted into dry air from dry nitrogen in the prior art is reduced, and the process condition of the air separation cold box is stabilized.

Description

technical field [0001] The invention belongs to the technical field of air separation, and in particular relates to an air separation purification and pressure equalization system and a control method. Background technique [0002] The air separation plant purifies the feed air (wet air containing impurities) from the main air compressor through two adsorbers arranged in parallel. The two adsorbers operate in an alternate switching mode, that is, when the first adsorber absorbs impurities in the raw air until its adsorbent is saturated, the second adsorber is in the regeneration stage, and once the adsorbent of the first adsorber is saturated, it is switched to The second adsorber adsorbs the impurities in the feed air, while the first adsorber starts its regeneration stage, and this alternates and repeats to produce the dry air required for air separation rectification. [0003] The adsorption stage refers to the process in which water, carbon dioxide, acetylene and other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/04B01D53/26
CPCB01D53/0407B01D53/0454B01D53/261B01D2257/80F25J3/04181F25J2205/72F25J3/04775F25J2245/40F25J2245/42F25J2245/50F25J2245/58F25J2210/04B01D53/047B01D2256/10B01D2256/12B01D2259/40007B01D2259/40035B01D2259/402Y02C20/40F25J3/04B01D53/0446
Inventor 埃里克·戴
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE