Apparatus and method to improve pulverizer and reduce NO.sub.x e

Details Apparatus and method to improve pulverizer and reduce NO.sub.x e Apparatus and method to improve pulverizer and reduce NO.sub.x e

1992-08-10

1993-09-07

Favors, Edward G.

Furnaces

Process

Burning pulverized fuel

110232, F23K 100

Patent

active

052419150

ABSTRACT:
An apparatus and method to improve pulverizer operation and reduce nitrogen oxide emissions from furnaces which burn pulverized coal from at least one pulverizer. A duct type burner burns a fuel in the primary air which heats the primary air supplied to the pulverizers. The combustion increases the primary air temperature and improves the drying of the coal, thus improving the pulverizer throughput and/or the fineness of the pulverized coal. Operation of the duct burner also reduces the oxygen in the primary air. The reduction in oxygen reduces the propensity of the coal to ignite in the pulverizers and cause fires or even explosions. The reduced oxygen in the primary air also reduces NO.sub.x formation.

REFERENCES:
patent: 3868211 (1975-02-01), La Haye et al.
patent: 4442783 (1984-04-01), Williams
patent: 4597342 (1986-07-01), Green et al.
patent: 4599954 (1986-07-01), Williams
patent: 4790743 (1988-12-01), Leikert et al.

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