The Formation of Nitric (Nitrogen) Oxides in Firebox Processes during Gas Combustion,

The conditions of nitric oxide formation in the combustion of fuel in boiler fireboxes were examined and equations were obtained for the evaluational determination of the NO output in the combustion zone. It was demonstrated, that under the conditions characteristic for a firebox process, the synthesis of nitric oxide takes place during combustion in the section from the beginning of the combustion zone up to the region of maximum temperature. The concentration of nitric oxide in the combustion products depends on the level and the distribution of the maximum temperatures in the firebox and the concentration of free oxygen in the zone of these temperatures. The final NO output in the flame tongue processes is indirectly connected with the process of hydrocarbon fuel combustion.