Abstract: The PSA unit status and retrofit in Luoyang Company were introduced. The PSA program was changed from 10-2-4 flow mode to 8-1-4 flow mode, raw materials pretreatment tank was added, and a simple revamping for the process scheme was conducted, the adsorbent was partially replaced. The hydrogen-rich gas can now directly enter the PSA unit for purification. The industrial calibration indicated that the recovery rate of hydrogen is 81.6% in the case of hydrogen-rich gas (hydrogen purity, 71.88%). The average content of CO in hydrogen product is less than 1μL / L, CO2 is less than 5μL / L, and the average purity of hydrogen product is 99.52%, meeting the requirement of the company.

Key words: PSA, hydrogen, pretreating tank