Furnaces – Utilizing powdered fuel
Patent
1987-06-26
1988-04-26
Favors, Edward G.
Furnaces
Utilizing powdered fuel
110204, 110345, 110347, 431 10, F23D 100
Patent
active
047397136
ABSTRACT:
A method for reducing the NO.sub.x content of effluent gas in a coal-dust-fired combustion system comprising establishing at least two vertically adjacent burner planes, in which the burner flame cores are fed with primary air in the core zones in a substoichiometric ratio to the coal dust feed stream and are additionally fed with secondary air comprising recycled flue gas in optional combination with preheated fresh air, and in which the burner mantle zones are fed with tertiary air comprising recycle flue gas and optional fresh air, so that, overall, a substantially stoichiometric combustion air ratio is established in the region of the lower burner plane and, overall, a highly substoichiometric combustion air ratio is established in the region of the upper burner plane. The apparatus employed is an economical primary measure requiring little space and minimal loss of energy, and is easily retrofitted in existing plants.
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Baumgart Heinz
Michalke Robert
Vier Fritz
Wiese Dietrich
Favors Edward G.
Henkel Kommanditgesellschaft auf Aktien
Millson Jr. Henry E.
Szoke Ernest G.
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