Method and apparatus for efficient recovery of heat from hot gases that tend to foul heat exchanger tubes
AssigneeExxon Research & Engineering Co.
InventorMorey E. Oldweiler
Life of this patent
Estimating the term…
Abstract
A method, together with suitable apparatus therefor, is provided useful in recovering heat from a high temperature cracked hydrocarbon gas, in which a liquid wash is injected into the tubes of a vertically oriented multitube transfer line heat exchanger to minimize deposition of coke. The wash liquid is introduced into a plenum chamber located above the top tube sheet and it then flows through a perforated plate. This distributes the liquid uniformly over the plate where it flows into the tubes to dissolve and/or flux condensates and coke.
Claims11
In recovering heat from a high temperature cracked hydrocarbon gas, a method of injecting a liquid wash into the tubes of a vertically oriented multitube shell-and-tube transfer line heat exchanger (TLE) comprising more than one heat exchange tube and a top tube sheet to prevent deposition of condensable components and coke which comprises introducing the liquid wash into a plenum chamber adjoining and on top of the shell side of the exchanger and defined by the top tube sheet of the exchanger, a horizontal distributor plate thereabove, an outer wall section of the shell of the exchanger therebetween and the wall portion of the tubes between the top tube sheet and the distributor plate;
- and causing the liquid wash to overflow the plenum chamber through holes in the distributor plate and flow downwardly within the tubes with the cracked gas.
In recovering heat from a high temperture cracked hydrocarbon gas, a method of injecting a liquid wash into the tubes of a vertically oriented multitube double pipe transfer line heat exchanger (TLE) comprising more than one double pipe heat exchange tube and top steam outlet header pipes to prevent deposition of condensable components and coke which comprises introducing the liquid wash into a plenum chamber located adjoining and on top of the top steam outlet header pipes and defined by said top steam outlet header pipes, a horizontal distributor plate thereabove, an outer wall section therebetween and the wall portion of the tubes between the top steam outlet header pipes and the distributor plate;
- and causing the liquid wash to overflow the plenum chamber through holes in the distributor plate and flow downwardly within the tubes with the cracked gas.
Dependencies are inferred from the claim text.