Recovery of hydrogen and liquefied gas components in gas after the overhaul of refinery

After a refinery was overhauled in 2019, the contents of hydrogen and liquefied gas above C₃ in gas system changed greatly. The hydrogen and hydrocarbon enriched components were sent to high pressure gas system. The hydrogen and liquefied gas components were not fully recovered and used as fuel gas of heating furnace, which caused the waste of hydrogen and liquefied gas resources. By optimizing the flow and operation parameters of the feed gas and the flow of the light hydrocarbon recovery, adjusting initial distillation tower pressure of atmospheric vacuum unit, the monthly total economic benefit increased 1.27 million yuan, which achieved good economic. At the same time, the optimization directions at the next step were put forward: (1) The hydrogen-rich gas flow of S Zorb was further optimized; (2) The adsorbent of aromatic and hydrogen production PSA was replaced to increase processing load and increase output of hydrogen; (3) Optimal operation of diesel hydrotreating unit to decrease the emission of hydrocarbon-rich gas; (4) The gas compressor of coking unit in high load was operated to increase the recovery of hydrocarbon-rich gas and increase the yield of liquefied gas.