Close-coupled transfer line heat exchanger unit

Details Close-coupled transfer line heat exchanger unit Close-coupled transfer line heat exchanger unit

F - Mech Eng,Light,Heat,Weapons

28

F

257/26, 23/400

F28F 9/00 (2006.01)

Patent

CA 1219254

ABSTRACT OF THE DISCLOSURE In thermal cracking of hydrocarbons, especially steam cracking to light olefins, a transfer line heat exchanger unit is provided in which cracked gas flows from a furnace into heat exchange tubes, which comprises a distributor having an inlet for said gas and two or three diverging branches forming with said distributor a wye or tri-piece for passage of gas, each branch having along its length a substantially uniform cross-sectional area and being in fluid flow communication with a respective cooling tube. Unfired residence time and pressure drop are reduced, thereby improving selectivity to ethylene.

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