Temperature swing adsorption gas purification system and purification process

Abstract

The invention discloses a temperature swing adsorption gas purification system and a temperature swing adsorption gas purification process. The temperature swing adsorption gas purification system comprises a raw material gas inlet main pipe, an adsorption purification device, a product gas discharge main pipe, a regeneration heater, a regeneration vacuum pump and a regeneration liquid separationtank. The system operates according to the following mode: when the system is controlled to operate, the adsorbent regeneration mode is vacuum negative pressure regeneration; after the vacuum negativepressure regeneration operation is carried out for several months, the temperature-changing washing regeneration is switched once only when the control index of the device has a rising trend; carrying out vacuum negative-pressure regeneration for several months after the primary variable-temperature washing regeneration until the next variable-temperature washing regeneration; in such a way, thesystem performs cyclic regeneration operations. By adopting the cyclic regeneration mode, regenerated gas, steam consumption and circulating cooling water consumption required by constant-temperatureflushing regeneration can be saved; and the total investment of the device is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of temperature swing adsorption adsorption towers and adsorbent regeneration, in particular to a temperature swing adsorption gas purification system and a purification process. Background technique [0002] Temperature swing adsorption is mainly used for the removal of trace impurity components that are difficult to desorb under normal temperature and pressure after adsorption. The regeneration of the adsorbent is carried out under normal pressure and high temperature. The regeneration is divided into two steps: high temperature flushing regeneration and low temperature flushing regeneration. The regeneration gas source is generally the product gas purified by temperature swing adsorption or other gases from the boundary area that do not contain impurities and have no effect on the performance of the adsorbent. During high-temperature flushing and regeneration, use steam to heat up the regeneration gas sour...

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Problems solved by technology

[0006] ①Temperature swing adsorption regeneration requires a large amount of regeneration gas, steam and cooling water consumption is also large, and the operating cost is high

[0007] ② Long regeneration time (the total time of high-temperature flushing regeneration and low-temperature flushing regeneration is about 10 hours) leads to a large amount of adsorbent loading, which also increases the weight of the adsorption tower equipment, and the total investment of the device is relatively large

[0008] ③Frequent high-temperature flushing regeneration makes the performance of the adsorbent significantly attenuated, which affects the service life of the adsorbent and the performance indicators of the device

Or in order to solve the problem caused by the attenuation of adsorbent performance, it is necessary to increase the amount of adsorbent additionally, thereby increasing the investment of the device

[0009] ④ When the product gas purified by the device is used as the regeneration gas source, it is necessary to increase the processing load of the device, thereby increasing investment and consumption

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