Abstract: The reforming hydrogen purification unit of a certain petrochemical company adopts pressure swing adsorption (PSA) technology to purify hydrogen gas. As the adsorbent usage time prolongs, the hydrogen content in the desorbed gas gradually increases, causing the compressor to surge and the desorbed gas to be intermittently discharged into the flare. Through optimizing the control scheme for desorption gas, the problem of large fluctuations in suction pressure has been solved, the environmental risks of torch emissions have been eliminated, and the steam consumption of the device has been reduced.

Key words: PSA, optimization of control scheme, energy saving, environment protection