초록 ▼

The generation of heat from the fossil fuels coal, oil and gas is possible nearly free from nitric oxide if the materials are burned in a multi-stage combustion process. The fuel, which, in some cases, contains ash, is admixed with highly heated air and steam and reacted to fuel gas in a ceramically

The generation of heat from the fossil fuels coal, oil and gas is possible nearly free from nitric oxide if the materials are burned in a multi-stage combustion process. The fuel, which, in some cases, contains ash, is admixed with highly heated air and steam and reacted to fuel gas in a ceramically fully lined melting chamber. The resulting fuel gas is cooled for the preheating of the air and steam generation, purified from solids and hydrogen sulfide, and fed into a flameless catalytic or noncatalytic combustion stage. In the combustion stage, because of the low caloric value of the admitted gas, only a temperature clearly below 1300°C. is reached in the ceramic combustion unit, so that the combustion takes place nearly free from nitric oxide.

대표청구항 ▼

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 improveme

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.