Patent ID: 7404891

Claim:
A process for recovering heat from a high temperature effluent stream from a catalyst regenerator, wherein the process comprises the steps of: (a) passing the effluent stream from a catalyst regenerator through a heat exchanger associated with a steam generator fed with liquid preheated boiler feed water to produce high pressure steam and partially cool the effluent stream; (b) passing the partially cooled effluent stream through a heat exchanger associated with a high pressure boiler feed water preheater to provide preheated boiler feed water and further cool the effluent stream; and (c) passing the preheated boiler feed water to the steam generator, wherein the preheated boiler feed water and the high pressure steam from the steam generator are mixed in a steam drum and liquid preheated boiler feed water is passed from the steam drum to the steam generator, wherein the high temperature effluent stream has a temperature of at least about 650° C., the partially cooled effluent stream has a temperature not greater than about 262° C., and the further cooled effluent stream has a temperature not greater than about 127° C., and wherein high pressure steam is taken from the steam drum.