Minimizing coke buildup in transfer line heat exchangers

Details Minimizing coke buildup in transfer line heat exchangers Minimizing coke buildup in transfer line heat exchangers

1986-06-13

1987-11-03

Davis, Jr., Albert W.

Heat exchange

Regenerator

Checker brick structure

1651341, 165 95, 165907, 134 2211, 201 2, F28F 1900

Patent

active

047037938

ABSTRACT:
Shell-and-tube transfer line heat exchangers having heat exchange tubes contained within an outer shell and a primary tubesheet, to minimize inlet end fouling, are disclosed. The exchanger includes: a secondary porous tubesheet, through which a reactive gas, e.g., an oxidizing gas such as air, oxygen, steam or mixtures thereof or a reducing gas such as hydrogen, carbon monoxide or mixtures thereof, can diffuse in amounts sufficient to react with coke deposits on the porous tubesheets process gas inlet side; the porous tubesheet is positioned preferably, but not necessarily, substantially parallel to the heat exchanger's process gas inlet end primary tubesheet nearer the inlet ends of the heat exchange tubes than the primary tubesheet and is, like the primary tubesheet, perforated by the heat exchange tubes, thus creating, with the heat exchanger's outer shell and the primary tubesheet, an enclosed space, and at least one gas inlet communicating with the enclosed space through which the reactive gas is fed. Methods of quenching high temperature gases while recovering useable heat therefrom using these transfer line heat exchangers are also disclosed.

REFERENCES:
patent: 3416598 (1968-12-01), Dozn
patent: 4097544 (1978-06-01), Hengstebeck
patent: 4366003 (1982-12-01), Kozte et al.
patent: 4551181 (1985-11-01), Stearman

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