Patent ID: 8684070

Claim:
A synthesis gas cooler for extracting heat from synthesis gas produced by a gasification process, comprising: a shell having a synthesis gas inlet and a synthesis gas outlet; a fluid-cooled flue contained within the shell for receiving synthesis gas; a combination of at least one quench means and at least one convective heat transfer means, wherein the combination of the at least one quench means and the at least one convective heat transfer means extends from a position vertically above to a position adjacent the synthesis gas outlet, the combination of the at least one quench means and the at least one convective heat transfer means designed to form a quench zone designed to cool and humidify the synthesis gas prior to exit thereof through the synthesis gas outlet; fluid-cooled radiant heat transfer surface partially extending within the flue for cooling the synthesis gas; a dip tube, wherein the dip tube has an inner and outer surface; and means for conveying the synthesis gas from the flue to the synthesis gas outlet, wherein the combination of the dip tube, the at least one quench means and the at least one convective heat transfer means extends from a position vertically above the synthesis gas outlet through a position adjacent the synthesis gas outlet to a position vertically below the synthesis gas outlet, wherein the at least one convective heat transfer means is formed from a plurality of horizontally oriented tubes, wherein the plurality of horizontally oriented tubes are formed so as to surround the outer surface of the dip tube, wherein the at least one quench means is formed from a plurality of nozzles mounted to the inner surface of the dip tube, and wherein the fluid-cooled radiant heat transfer surface comprises at least two sets of platens, a first set of platens having a first radial length and a second set of platens having a second radial length where the first radial length is longer than the second radial length.