Low emission and low excess air steam generating system and meth

Details Low emission and low excess air steam generating system and meth Low emission and low excess air steam generating system and meth

1994-10-13

1996-02-06

Denion, Thomas E.

Furnaces

Process

Burning pulverized fuel

110345, 110186, F23D 100

Patent

active

054889162

ABSTRACT:
A pulverized coal steam generator employing tangential, concentric firing with oxidizing conditions adjacent the furnace walls and using overfire air and low NO.sub.x firing methods is operated at very low excess air levels. This is possible because the unburned carbon in the flyash is measured and the pulverizers are adjusted to control the particles size of the pulverized coal and maintain a desired carbon level. The slagging and corrosion associated with deep staging is overcome by the concentric firing. Overall plant efficiency is obtained while still meeting performance objectives and emissions controls.

REFERENCES:
patent: 4332207 (1982-06-01), Biaskowski et al.
patent: 4518123 (1985-05-01), Tanaka et al.
patent: 4622922 (1986-11-01), Miyagaki
patent: 4969408 (1990-11-01), Archer et al.
patent: 5155047 (1992-10-01), Cioni et al.
patent: 5158024 (1992-10-01), Tanaka et al.

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