The Nitrogen Oxide Formation Studying at Natural Gas Combustion in Non-circular Profile Furnaces of Fire-tube Boilers

The chemical reactions and mathematical model accompanying the thermal, prompt and fuel nitrogen oxides emergence are presented in the paper. The furnace profile changing is a type of passive methods making it possible to decrease NOx concentration by means of gas flow velocity increasing, average temperature of gas mixture in the furnace decreasing and through the recirculation processes. The graphical study results in the form of variables characterizing ecological efficiency are represented.