| abstract |
A cooler for process gas of temperatures in excess of 750* C in which the gas passes through tubes, the cooling length of which is subdivided into three sections. The sections comprise; first, a hot or inlet section where the tubes are surrounded by a vaporizing liquid; secondly, a medium temperature or intermediate section where the tubes are arranged in a steam space and cooled by the saturated steam produced; and, thirdly, a cool discharge section where the tubes are surrounded by the vaporizing liquid. The tubes are of inverted U-shape and preferably are of serpentine form where one arm of the U has portions overlapping the other arm for greater heat exchange. Vaporizing liquid is recirculated, added to, and cooled by feedwater. |