Process and device for the nitric oxide-free generation of steam with fossil fuels

Claim 1

In a process for the nitric oxide-poor reaction of fossil fuels with ash contents in a two-stage combustion process consisting of a first gasification stage with partial oxidation for producing fuel gas, and a second stage for the combustion of the fuel gas produced in the first stage, the improvement comprising: reacting the fossil fuels in a ceramically insulated first stage gasification chamber with air preheated to 300° to 700° C. cooling the resulting gasification gases first to 900° to 1000° C. in a radiation zone with fin-type tubes connected following the gasification chamber and then to low temperatures in a subsequently connected heat exchanger system and removing solids and hydrogen sulfide components carried along by said gases; and mixing said gases with the remaining combustion air and completely burning substantially free from nitric oxide at below 1300° C. in a second stage ceramic combustion unit consisting of structured ceramic layers having a length from 10 to 100 times their bore diameter, said second stage including a combustion catalyst which contains as an active substance 50 to 95% lanthanum and 5 to 50% cerium.