Abstract: This paper proposes three typical selection of charge gas compressor interstage after-coolers for ethylene plant covering double segmental baffle exchanger, X-shell exchanger and heat changer with helical baffle. Combining with the process characteristics of the interstage after-coolers, fluid fouling characteristics, optimization design of heat transfer, mechanical cleaning requirements and investment economics, this paper carries out an analysis of the advantages and disadvantages of the three types of interstage after-coolers and comprehensive comparison. Meanwhile, the preferred recommended selection sequence is given based on actual engineering experience, which provides a theoretical basis for the selection of interstage after-coolers of this system for the ethylene plant.

Key words: charge gas compression, interstage after-coolers, corrosion, heat exchanger selection, ethylene plant