Furnaces – Including fluid fuel burner – Powdered solid fuel
Patent
1990-10-03
1992-09-15
Yuen, Henry C.
Furnaces
Including fluid fuel burner
Powdered solid fuel
110263, 110347, 110264, F23K 500, F23D 100
Patent
active
051468581
ABSTRACT:
A boiler furnace combustion system typically includes main burners disposed on side walls of or at corners of a square-barrel-shaped boiler furnace having a vertical axis, the burner axes being directed tangentially to an imaginary cylindrical surface coaxial to the furnace. Air nozzles are disposed in the boiler furnace at a level above the main burners, so that unburnt fuel left in a reducing atmosphere or a lower oxygen concentration atmosphere of a main burner combustion region can be perfectly burnt by additional air blown through the air nozzles. The present invention provides two groups of air nozzles disposed at higher and lower levels, respectively. The air nozzles at the lower level are provided at the corners of the boiler furnace with their axes directed tangentially to a second imaginary coaxial cylindrical surface having a larger diameter than the first imaginary coaxial cylindrical surface. And, the air nozzles at the higher level are provided at the centers of the side wall surfaces of the boiler furnace with their axes directed tangentially to a third imaginary coaxial cylindrical surface having a smaller diameter than the second imaginary coaxial cylindrical surface.
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Naito Shuzo
Oguri Masaharu
Tokuda Kimishiro
Mitsubishi Jukogyo Kabushiki Kaisha
Yuen Henry C.
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