Method of reducing NO.sub.x and SO.sub.x emission

Details Method of reducing NO.sub.x and SO.sub.x emission Method of reducing NO.sub.x and SO.sub.x emission

1983-03-21

1984-01-24

Yuen, Henry C.

Furnaces

Process

Burning pulverized fuel

110261, 110263, F23K 100, F23D 100

Patent

active

044269390

ABSTRACT:
The method of operating a furnace including the steps of conveying (30) pulverized coal in an air stream towards a furnace (10), separating (34) the stream into two portions (36,38), one being a fuel rich portion (38), and the other being a fuel lean portion (36), introducing (40) the fuel rich portion into the furnace in a first zone, introducing (42,44) air into the first zone in a quantity insufficient to support complete combustion of all of the fuel in the fuel rich portion, introducing (46) the fuel lean portion into the furnace in a second zone, introducing (48) air into the second zone in a quantity such that there is excess air over that required for combustion of all of the fuel within the furnace, and introducing (50) lime into the furnace simultaneously with the fuel, so as to minimize the peak temperature within the furnace, and also minimize the formation of NO.sub.x and SO.sub.x in the combustion gases.

REFERENCES:
patent: 4150631 (1979-04-01), Frey et al.
patent: 4173189 (1979-11-01), Cooper
patent: 4184456 (1980-01-01), Taylor et al.
patent: 4246853 (1981-01-01), Mehta
patent: 4249470 (1981-02-01), Vatsky
patent: 4252069 (1981-02-01), McCartney
patent: 4274343 (1981-06-01), Kokkinos
patent: 4294178 (1981-10-01), Borio et al.
patent: 4304196 (1981-12-01), Chadshay et al.
patent: 4316420 (1982-02-01), Kochey

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