Diminishing nitrogen oxides content in combustion gases - during sintering of preheated mixt. of ore, flux and solid fuel

摘要

Sintering of mixts. contg. ores, fluxes and solid fuels is improved by preliminarily heating the mixt. before ignition of the fuel, whereby the formation of nitrogen oxides (NOx) in the combustion gases is greatly reduced. The preheating is pref. carried out with a reducing gas. The redn. of NOx content to the admissible value (from e.g. 310 ppm to 100 ppm or less) is carried out economically.