Pulverized coal burner and method of using same

Details Pulverized coal burner and method of using same Pulverized coal burner and method of using same

1995-06-05

1998-09-15

Kwon, John T.

Furnaces

Including fluid fuel burner

Powdered solid fuel

110264, 110265, F23C 112

Patent

active

058064435

ABSTRACT:
To provide a pulverized coal burner capable of reducing the NOx concentration at the time of a low load, a pulverized coal burner includes a secondary air nozzle and a tertiary air nozzle concentrically positioned about the outer periphery of a fuel nozzle carrying a pulverized coal with a primary air, and two swirling flow generators are included at least one of these nozzles with a positional relation parallel to a flow of air. One of the swirling flow of the two swirling flow generators can be set strongly. And, under a condition of low air flow rate, air can be supplied from one swirling flow generator alone. Since the swirling strength of the combustion air can be increased, the concentration of NOx produced by the combustion of the pulverized coal can be reduced. Also, because the swirling strength at the time of low load can be increased, the NOx concentration can be reduced by keeping the pulverized coal flame stable.

REFERENCES:
patent: 2911034 (1959-11-01), Webb
patent: 4702180 (1987-10-01), Kiga
patent: 4748919 (1988-06-01), Campobenedetto et al.
patent: 4915619 (1990-04-01), LaRue
patent: 5011400 (1991-04-01), Vatsky
patent: 5231937 (1993-08-01), Kobayashi et al.
Patent Abstracts of Japan, vol. 008, No. 080 (M-289), 12 Apr. 1984.

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