High-temperature coal gas cooling device

The utility model discloses a high-temperature coal gas cooling device. The device comprises a closed flue defined by a membrane type water cooling wall, the upper end of the flue is a high-temperature gas inlet; a first-stage superheater, a second-stage superheater, a first-stage evaporator, a second-stage evaporator and a coal economizer are sequentially arranged in the flue from top to bottom,feed water enters the coal economizer from a feed water inlet to be subjected to heat exchange, and a steam-water mixture obtained after heat exchange enters the boiler barrel through a drainage pipeand then enters the membrane wall through a descending pipe. A steam-water mixture passes through the membrane wall and the two-stage evaporator; saturated steam in the boiler barrel is led to the second-stage superheater through the saturated steam leading-out pipe and becomes superheated steam after heat exchange through the second-stage superheater, the water spraying desuperheater and the first-stage superheater in seq