Patent ID: 8240259

Claim:
A method of cooling hot crude gas and slag from entrained flow gasification of liquid and solid combustibles at crude gas temperatures ranging from 1,200 to 1,800 degrees C. and at pressures of up to 80 bar, the method comprising: providing an entrained flow gasification reactor having a cooling chamber configured to be a free space disposed downstream; providing a metal apron forming an annular channel with a cooling chamber wall, said apron protecting said pressure-carrying cooling chamber wall; providing nozzles in said apron for dispersing cooling water in a free space of said cooling chamber; feeding a first portion of cooling water through a nozzle of said nozzles into the cooling chamber so as to be finely dispersed; and feeding a second portion of cooling water into a bottom of said annular channel, so that said second portion of the cooling water flows upward in said annular channel; spilling said second portion of said cooling water over a top of said metal apron wherein the top of said metal apron forming a spillover dam, so that said second portion of cooling water trickles down an inner side of said metal apron in a form of a water film completely coating the inner side of said metal apron; monitoring a height of water spilling over the spillover dam so that the operability of said metal apron is monitored and so that the metal apron can be cooled by the cooling water and thus be protected; and cooling down the crude gas by injecting water down to vapor saturation at temperatures between 180 degrees C. and 240 degrees C.