Method and arrangement for reducing NO.sub.x emissions from furn

Details Method and arrangement for reducing NO.sub.x emissions from furn Method and arrangement for reducing NO.sub.x emissions from furn

1981-07-08

1983-07-19

Yuen, Henry C.

Combustion

Process of combustion or burner operation

Feeding flame modifying additive

431190, 110215, F23J 700

Patent

active

043941184

ABSTRACT:
A combustion apparatus has a combustion chamber which is divided into combustion zones respectively communicating with individual mixing zones in a mixing chamber. Combustion air enters the mixing zones and then flows into the combustion zones. The concentration of NO.sub.x in the combustion products of each of the combustion zones is measured and water vapor is fed into each mixing zone in an amount which depends upon the NO.sub.x concentration for the corresponding combustion zone. The amount of water vapor fed into a mixing zone is such as to maintain the combustion temperature below a value at which substantial quantities of NO.sub.x are formed. The water vapor is fed into the mixing zones generally countercurrent to the combustion air entering the combustion zones and the water vapor and combustion air flow into the combustion zones together.

REFERENCES:
patent: 1159862 (1915-11-01), Ostergren
patent: 1291175 (1919-01-01), Sargent et al.
patent: 3183864 (1965-05-01), Stengel
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patent: 3530807 (1970-09-01), Zalman
patent: 3785304 (1974-01-01), Stookey
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patent: 4144015 (1979-03-01), Berthiaume
patent: 4162140 (1979-07-01), Reed
patent: 4173450 (1979-11-01), Schrank
patent: 4244684 (1981-01-01), Sperry et al.

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