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The basic principle of pressure swing adsorption is as follows: it takes advantage of the selective adsorption property of adsorbents toward gases – that is, different gases (adsorbates) are adsorbed in varying amounts by the adsorbent – as well as the fact that the amount of a specific gas adsorbed on the adsorbent changes with pressure. This principle is used to separate gas mixtures and to regenerate the adsorbent. Pressure swing adsorption decarbonization technology utilizes the principle of pressure swing adsorption: under conditions that favor the selective adsorption by the adsorbent, impurity components such as CO2 in the feed gas are adsorbed at increased pressure, while components that are not easily adsorbed, such as hydrogen, nitrogen, and methane, pass through the adsorption bed and are discharged from the top of the adsorber. This process enables the separation of the gas mixture. By reducing the pressure in the adsorption bed, the adsorbed components like CO2 are desorbed, allowing the adsorbent to be regenerated. The adsorption of different components by the adsorbent in the adsorber is quantitative; once the adsorbent has absorbed a sufficient amount of the desired components, these components can be effectively desorbed from the adsorbent, allowing it to be reused. Only then does the adsorption separation process become practical. Therefore, each adsorber must go through adsorption and regeneration stages in the actual process. For each adsorber, the adsorption process is intermittent; multiple adsorbers must be operated in cycles to continuously produce product gas. The adsorption process has the following characteristics: ① The adsorbent exhibits selectivity in adsorbing gases, that is, different gases (adsorbates) are adsorbed in different amounts on the adsorbent ； ② The amount of a specific gas adsorbed on an adsorbent decreases as its partial pressure drops. The desorption process of \"vacuum depressurization\" can reduce the partial pressure of adsorbed components such as CO2, thereby enabling thorough regeneration of the adsorbent. The significance of multi-bed pressure swing adsorption is to ensure that an equal number of adsorption beds are in the adsorption state at all times, thereby enabling continuous and stable output of the product ； Ensure an appropriate number of voltage equalization cycles to achieve a high recovery rate for the product