Multi-tower pressure swing adsorption grading flushing device and method

Abstract

The invention discloses a multi-tower pressure swing adsorption grading flushing device and a method. Two concurrent discharge vessels are connected with an adsorption tower; one vessel is a high-pressure concurrent discharge vessel for storing product gas in higher purity and the other vessel is a low-pressure concurrent discharge vessel for storing product gas in lower purity; adjusting valves for adjusting the flushing flux are arranged at an outlet of the high-pressure concurrent discharge vessel and at the outlet of the low-pressure concurrent discharge vessel; the product gas in lower purity in the low-pressure concurrent discharge vessel is firstly used for flushing and then the product gas in higher purity in the high-pressure concurrent discharge vessel is used for later flushing in the flushing process; the flushing time is adjusted according to the pressure of the high-pressure concurrent discharge vessel and the low-pressure concurrent discharge vessel, so that the complete gas exhausting in the flushing process is guaranteed; the practical running regenerating effect is excellent; and the impurity content in the product gas can be effectively controlled.

Description

technical field [0001] The invention belongs to the technical field of pressure swing adsorption technology, and in particular relates to a multi-tower pressure swing adsorption classification flushing device and method. Background technique [0002] For the regeneration of the adsorbent in the pressure swing adsorption process, the tower-to-tower flushing method was adopted in the early stage. The disadvantages of this regeneration method are: a. High pressure first and then low pressure, resulting in high-purity gas flushing first and then low-purity gas flushing, and the regeneration effect is not good; b. , The washing time is short. After improvement, the parallel release tank process is now commonly used. The improvement of this regeneration method is: put the forward release gas into the forward release tank, and the forward release tank will flush the adsorption tower. The advantages of this regeneration process are: a. The gas is mixed in the tank in the tank, and ...

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Problems solved by technology

[0002] For the regeneration of the adsorbent in the pressure swing adsorption process, the tower-to-tower flushing method was adopted in the early stage. The disadvantages of this regeneration method are: a. High pressure first and then low pressure, resulting in high-purity gas flushing first and then low-purity gas flushing, and the regeneration effect is not good; b. , short flushing time

[0003] However, when the product gas purity is high (such as hydrogen purity ≥ 99.99%) or the impurity is strict (such as CO+CO 2 ≤20PPm), the defects of this regeneration method are highlighted: a. The flushing gas is preferably low-purity gas in the early stage, and high-purity gas for regeneration in the later stage; b. The regeneration time is prolonged and the regeneration is cleaner

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