Abstract:

Hydrogen is an indispensable feedstock for petrochemical production. To recover hydrogen from CO-containing desorption gas and enhance the plant-wide hydrogen utilization efficiency, the process flow of the existing pressure swing adsorption (PSA) unit for CH₄ impurity removal was to be optimized. Based on the fundamental PSA theory and the current operational data, the unit's CO adsorption capacity was calculated, and the theoretical calculation formula for the adsorption time of the modified unit was derived. The results technically demonstrated the unit's capability to process CO-containing gas sources. An analysis of the additional costs and economic benefits after the modification shows that the modified unit could recover 17.9 million kg of hydrogen annually, generating a direct economic benefit of 40.9147 million yuan for the enterprise. The results demonstrate that this modification scheme is technically and economically feasible. It provides a reliable optimization approach for refining and petrochemical enterprises to maximize hydrogen resource utilization during initial operation stages, which is conducive to the green and low-carbon development of enterprises.

Key words: desorption gas')">

desorption gas, pressure swing adsorption, optimization and renovation, adsorption capacity