Method and apparatus for decreasing nitrogen oxides and unburnt hydrocarbons when burning hydrocarbon fuels

摘要

Fuel is burned in two chambers, the first with excessive air to produce combustion gases containing oxygen and the second using cooled combustion gases from the first to constitute the oxidizing medium. Preferably the proportions of fuel in the two chambers are equal and the combustion gases are cooled to about 800 DEG C.