Pulverized fuel combustion burner

Details Pulverized fuel combustion burner Pulverized fuel combustion burner

1998-03-31

2000-11-14

Price, Carl D.

Furnaces

Including fluid fuel burner

Powdered solid fuel

110263, 110347, 2395874, 2395905, F23C 100, F23D 100

Patent

active

061454494

ABSTRACT:
A pulverized fuel combustion burner and furnace arrangement has a plurality of air nozzles arranged on a side wall of the furnace for injecting a mixed flow of pulverized fuel and carrier air to establish a flame into the furnace. The plurality of nozzles includes a primary nozzle for injecting the mixed flow into the furnace and a secondary nozzle positioned around the primary nozzle for feeding combustion auxiliary air around the primary nozzle. A pulverized fuel supply pipe feeds the mixed flow to the primary nozzle. The primary nozzle and the pulverized fuel supply pipe are joined at a jointed portion at which the primary nozzle can be pivoted to change a direction for injecting the mixed flow into the furnace. The pulverized fuel supply pipe extends through a windbox, the windbox forming a combustion auxiliary air supply passage around the pulverized fuel supply pipe. A rich/lean flow separator is disposed in a middle portion of the pulverized fuel supply pipe spaced from opposite inner walls of the pulverized fuel supply pipe such that when the mixed flow flows around the rich/lean flow separator, a rich/lean flow concentration distribution is established in which a fuel-rich flow is created at an outer part inside of the pulverized fuel supply pipe and adjacent to the opposite inner walls and a fuel-lean flow is created at an inner part inside of the rich flow and along a center line of the pulverized fuel supply pipe. Flow straightening plates are disposed and positioned in the primary nozzle and the pulverized fuel supply pipe downstream of the rich/lean flow separator so as to maintain the rich/lean flow concentration distribution established by the rich/lean flow separator to the exit of the primary nozzle.

REFERENCES:
patent: 4252069 (1981-02-01), McCartney
patent: 4539918 (1985-09-01), Beer et al.
patent: 4611543 (1986-09-01), Collette
patent: 4930430 (1990-06-01), Allen et al.
patent: 5090339 (1992-02-01), Okiura et al.
patent: 5215259 (1993-06-01), Wark
patent: 5392720 (1995-02-01), Briggs et al.
patent: 5483906 (1996-01-01), Hufton
patent: 5535686 (1996-07-01), Chung
patent: 5605103 (1997-02-01), LaRue
patent: 5842426 (1998-12-01), Ohta et al.

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