干气提浓乙烯装置加工重整变压吸附解吸气的技术改造

为了加工重整变压吸附（PSA）解吸气，中国石油四川石化公司对30 000 m3/h 干气提浓乙烯装置进行了技术改造。重整PSA解吸气中C3及C3以上重组分的体积分数为13.52%，远高于设计值（3%），使该装置产生的凝液较多，凝液主要为C3~C5组分以及少量水分。改造中增设了管线将凝液送至催化裂化装置，并将凝液管线增加伴热设施，及时将凝液排出回收利用。改造后装置运行效果良好，能将富含重组分的重整PSA解吸气中的C2及C2以上组分高效回收，并有效脱除 H2S, CO2, O2等杂质，为蒸汽裂解制乙烯装置提供合格的原料气，经济效益可提高 5 063 万元/a。

TECHNICAL TRANSFORMATION OF ETHYLENE ENRICHMENT UNIT FOR PROCESSING CATALYTIC REFORMING PSA DESORPTION GAS

The technical transformation of ethylene enrichment unit for dry gas with a capacity of 30,000 m3/h in PetroChina Sichuan Petrochemical Co., was conducted to process PSA desorption gas of catalytic reforming unit. The heavy component (≥C3) in the desorption gas is up to 13.52%, far more than the design value of 3%, that makes more condensate in the ethylene enrichment unit. The condensate is mainly composed of C3-C5 components and a small amount of water. An additional pipeline with heat tracer was set for delivering the condensate to the catalytic cracking unit for recycling. The results after revamping show that C2 and C2 above components in the gas can effectively be recovered, and at the same time the impurities of H2S，CO2 and O2 were removed. The ethylene enriched gas is a qualified feed for ethylene unit, and the net profit reaches 50.63 million Yuan/a after transformation.