Pulverized fuel combustion burner

Details Pulverized fuel combustion burner Pulverized fuel combustion burner

1997-06-03

2000-02-15

Bennett, Henry A.

Furnaces

Including fluid fuel burner

Powdered solid fuel

110104B, 110265, 110264, F23L 700

Patent

active

06024030&

ABSTRACT:
A burner for combustion of a pulverized coal mixture having two kinds of rich and lean concentration has a height of a burner panel reduced and the overall burner simplified. A rich/lean separator (10, 20, 30) is provided within a pulverized coal conduit (2) so that a high concentration mixture is formed in an outer peripheral portion and a low concentration mixture is formed in a central portion within a single pulverized coal conduit. Thus, a rich mixture burner and a lean mixture burner, which have been conventionally provided separately, may be formed into a single burner. Recirculation of air is accelerated by a cutaway slit (20d, 30d) provided in a central portion of the rich/lean separator to make the air flow rate distribution uniform in a pulverized coal nozzle. Also, a duct and an air blow box for the combustion air to be supplied to the pulverized coal flame are not integrally formed continuous in the height direction, but are divided into a plurality of discontinuous units.

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J. Piepho et al., "Seven Different Low-NO.sub.x Strategies Move from Demonstration to Commercial Status," Power-Gen '92, Nov. 19, 1992.
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T.F. Wall, Principles of Combustion Engineering for Boilers, pp. 262, 263 and 296 (1987).

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