CN-121988130-A - Continuous gas separation adsorption system and method

CN121988130ACN 121988130 ACN121988130 ACN 121988130ACN-121988130-A

Abstract

A continuous gas separation adsorption system and method, the system includes that an adsorption tower adopts an adsorption bed to adsorb impurities in raw gas to generate purified gas, the temperature in the adsorption tower is less than or equal to a preset temperature threshold, a first conveying device conveys saturated adsorbent in the adsorption bed to a regeneration device, the regeneration device is arranged outside the adsorption tower and is used for carrying out regeneration treatment on the saturated adsorbent to obtain regenerated adsorbent, a second conveying device returns the regenerated adsorbent to the adsorption bed, only one adsorption tower is needed, the regeneration of the saturated adsorbent is realized through a regeneration device arranged outside the adsorption tower, and the regenerated adsorbent is returned to the adsorption tower, so that the dynamic cyclic utilization of the adsorbent is realized, the switching between the adsorption tower and the regeneration tower is not needed, the downtime is reduced, the investment construction cost and the operation cost of the gas adsorption system are reduced while the regeneration effect of the adsorbent is ensured, the continuous adsorption of the raw gas and the continuous regeneration of the adsorbent are realized, and the working efficiency is improved.

Inventors

HUANG JIAN
ZHANG ZHE
WANG CHUNYAN
ZHANG LEI
Chen Siding
Liang Yuejiu

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (10)

1. A continuous gas separation and adsorption system, comprising: the adsorption tower is used for adsorbing impurities in the raw material gas by adopting an adsorption bed to generate purified gas, wherein the temperature in the adsorption tower is less than or equal to a preset temperature threshold value; a first conveying device for conveying the saturated adsorbent in the adsorbent bed to a regeneration device; The regenerating device is arranged outside the adsorption tower and is used for regenerating the saturated adsorbent to obtain regenerated adsorbent; and a second conveying device for returning the regenerated adsorbent to the adsorbent bed.
2. The continuous gas separation adsorption system of claim 1, wherein the adsorption column comprises: The adsorbent discharging channel is arranged at the lower part of the adsorption tower and is used for discharging the saturated adsorbent to the first conveying device; And an adsorbent feed passage for conveying the regenerated adsorbent from the second conveying means to the top of the adsorbent bed.
3. The continuous gas separation adsorption system of claim 2, wherein the adsorption column further comprises: A heat exchanger disposed between an outlet of the adsorbent feed passage and a top of the adsorbent bed for cooling the returned regenerated adsorbent and reducing a temperature in the adsorption column; And the pressure control device is used for monitoring and adjusting the air pressure in the adsorption tower in real time.
4. The continuous gas separation and adsorption system of claim 2, wherein: the adsorbent feed passage is provided with a valve for adjusting the feed frequency of the regenerated adsorbent.
5. The continuous gas separation and adsorption system of claim 1, wherein the adsorption column comprises a feed gas channel and a gas distributor connected to an outlet of the feed gas channel; the feed gas channel is used for conveying the feed gas to the adsorption bed; The gas distributor is arranged in the adsorption bed and is used for uniformly distributing the raw gas into the adsorption bed, and the gas distributor is a porous plate distributor, a nozzle distributor or a porous pipe distributor.
6. The continuous gas separation and adsorption system of claim 1, wherein the regeneration device comprises a heating device and a depressurization device; the heating device is used for heating the saturated adsorbent to a regeneration temperature; The depressurization device is used for depressurizing the saturated adsorbent to a regeneration pressure.
7. The continuous gas separation and adsorption system of claim 1, wherein the adsorption column comprises a product gas channel and a gas-solid separator connected to an inlet of the product gas channel; The gas-solid separator is used for removing solid particles in the purified gas to generate product gas; The product gas channel is arranged at the top of the adsorption tower and is used for discharging the product gas.
8. The continuous gas separation and adsorption system of claim 1, wherein: The adsorbent in the adsorbent bed comprises at least one of alumina, molecular sieve, active carbon and silica gel.
9. The continuous gas separation and adsorption system of claim 1, wherein: the raw material gas is crude helium gas containing the impurities, and the impurities comprise nitrogen and oxygen; or the raw material gas is crude hydrogen containing the impurities, wherein the impurities comprise oxygen, nitrogen and carbon dioxide.
10. A continuous gas separation adsorption process, wherein the process is performed on the basis of a continuous gas separation adsorption system according to any one of claims 1-9, comprising: conveying raw material gas to an adsorption bed in an adsorption tower, and adsorbing impurities in the raw material gas to generate purified gas, wherein the temperature in the adsorption tower is less than or equal to a preset temperature threshold value; conveying the saturated adsorbent in the adsorption bed to a regeneration device arranged outside the adsorption tower through a first conveying device; regenerating the saturated adsorbent by a regenerating device to obtain a regenerated adsorbent; The regenerated adsorbent is returned to the adsorbent bed by a second transport means.

Description

Continuous gas separation adsorption system and method Technical Field The present invention relates to the field of gas processing, and more particularly to a continuous gas separation and adsorption system and method. Background The low-temperature adsorption technology realizes the high-efficiency separation of gas by utilizing the selective adsorption capability of different gas components on adsorbents under low-temperature conditions, at present, a low-temperature adsorption system on the market generally adopts a multi-adsorption tower structure, gas separation and purification are realized through alternate work among a plurality of adsorption towers, for example, when two adsorption towers are adopted, when the adsorbents in the first adsorption tower reach a saturated state, raw gas is switched into the second adsorption tower to carry out low-temperature adsorption, the first adsorption tower is converted into a regeneration tower to carry out regeneration treatment on the saturated adsorbents, after the adsorbents in the second adsorption tower reach the saturated state, the raw gas is switched into the first adsorption tower to carry out low-temperature adsorption after the regeneration of the first adsorption tower is completed, but the multi-adsorption tower structure has the following problems that the first adsorption tower structure has high equipment investment, at least two adsorption towers are required to be configured in general, so that the economic burden is increased, and the problem is particularly prominent in industrial scale application; secondly, because the adsorbent needs to be depressurized and heated during each regeneration treatment, and then needs to be pressurized and cooled after entering a low-temperature adsorption stage, the whole system has very high operation energy consumption, further increases the economic cost and reduces the economic benefit. Disclosure of Invention The embodiment of the application provides a continuous gas separation adsorption system and a continuous gas separation adsorption method, which realize dynamic circulation of an adsorbent through an external regeneration device of an adsorption tower, reduce investment construction cost and operation cost of a gas adsorption system, realize continuous adsorption of raw gas and continuous regeneration of the adsorbent, and improve working efficiency. In one aspect, embodiments of the present application provide a continuous gas separation adsorption system, comprising: the adsorption tower is used for adsorbing impurities in the raw material gas by adopting an adsorption bed to generate purified gas, wherein the temperature in the adsorption tower is less than or equal to a preset temperature threshold value; a first conveying device for conveying the saturated adsorbent in the adsorbent bed to a regeneration device; The regenerating device is arranged outside the adsorption tower and is used for regenerating the saturated adsorbent to obtain regenerated adsorbent; and a second conveying device for returning the regenerated adsorbent to the adsorbent bed. In another aspect, an embodiment of the present application further provides a continuous gas separation and adsorption method, which is performed by using the continuous gas separation and adsorption system according to the above embodiment, including: conveying raw material gas to an adsorption bed in an adsorption tower, and adsorbing impurities in the raw material gas to generate purified gas, wherein the temperature in the adsorption tower is less than or equal to a preset temperature threshold value; conveying the saturated adsorbent in the adsorption bed to a regeneration device arranged outside the adsorption tower through a first conveying device; regenerating the saturated adsorbent by a regenerating device to obtain a regenerated adsorbent; The regenerated adsorbent is returned to the adsorbent bed by a second transport means. Compared with the prior art, the continuous gas separation adsorption system and the continuous gas separation adsorption method can realize continuous low-temperature adsorption separation of raw gas by only one adsorption tower, can realize regeneration of saturated adsorbent by the regeneration device arranged outside the adsorption tower, and returns the regenerated adsorbent to the adsorption tower to be continuously applied to low-temperature adsorption of the raw gas, so that dynamic recycling of the adsorbent is realized, switching between the adsorption tower and the regeneration tower is not needed, the downtime is reduced, the regeneration effect of the adsorbent is ensured, the investment construction cost and the operation cost of the gas adsorption system are reduced, the continuous adsorption of the raw gas and the continuous regeneration of the adsorbent are realized, and the working efficiency of the continuous gas separation adsorption system is improved. Additional features and advantages of