Abstract: In the two expansions of an ethylene plant, the C₂ system of cold section was changed from the acetylene hydrogenation of the total deethanizer overhead effluent to the hydrogenation of the net C₂ product in the first stage, where only a few modification of the acetylene hydrogenation, green oil absorber and ethylene drying sections was required, and then to cascade hydrogenation of both total effluent and net product in the second stage to overcome the difficulty in refrigerant services. The plant capacity was increased twice by 60%, and the revamping work was reduced to some extent and the operation stability of system was improved.

摘要： 某乙烯装置的冷区C₂系统，在两轮改扩建中，先将全馏分加氢改造成产品加氢，使其中间的加氢、洗涤和干燥部分未做大改动；后又改造到全馏分和产品叠加加氢，解决了改造中制冷剂使用遇到的困难，两次改造使装置生产能力都提高60%以上。应用这一措施，一定程度减少了装置改造工作量，并有效地改善了系统操作的稳定性。