PROCESS FOR SEPARATING AND RECYCLING REFINERY DRY GAS

摘要

A process for separating and recycling refinery dry gas. At least a one-stage pressure swing adsorption unit is provided; at least two adsorption beds filled with an adsorbent are disposed in the one-stage pressure swing adsorption unit; the adsorption beds operate alternately according to set time sequence steps; each adsorption bed at least sequentially undergoes process steps such as adsorption, reduced pressure equalization, concentration, reverse exhaust, vacuumizing, pre-adsorption, increased pressure equalization, and final charging. Two material flows, i.e., C₂+ component product gas and hydrogen-rich product gas having a C₂+ component concentration of greater than 92v% and a recovery rate of greater than 92%, can be obtained after dry feed gas is separated by a pressure swing adsorption unit. Compared with the prior art, the process has simpler procedures, lower investment and operation cost, and higher yield of C₂+ components and product purity; if necessary, the dry feed gas can be separated by the one-stage pressure swing adsorption unit and a two-stage pressure swing adsorption unit to obtain three material flows, i.e., C₂+ component product gas, hydrogen product gas, and fuel gas.