FAF23.7-13.3-1 Maintenance of rotor of adjustable axial flow forced draft fan with movable blades
Supply fan: provides secondary air, after passing through the air preheater, part of the burner provides perimeter wind, sandwich wind, etc., which affects the flame at the burner and can cool the burner at the same time. The other part provides the oxygen needed for the boiler to burn. Finally, there is one that provides SOFA and COFA wind to adjust the use of combustion.
SOFA is called separation of exhaust air, which is a technology to reduce the emission of nitrogen oxide from power plant boilers.
COFA is called the compact burnout wind
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