Based on extensive field test

performance test and theoretical calculations

the author found out the excessive large resistance of air supply net was the main reason for the insufficient output of boiler forced draft fans in the two 125 MW units of Jiayuguan Hongsheng Electric Company

and too large resistance of the wing-type air flow measurement device was the key factor.Thus

energy-saving renovation on the fans was conducted.Such as

changing the secondary air nozzle on the lower layer of the burner

enlarging the flow area of duct for the nozzle refered

adding dampers in the bifurcation of air ducts leading to the No.1 and No.2 corners

as well as No.3 and No.4 corners

separately

and installing arc baffles in elbows that lead to the four corners simultaneously.Results show that

the above modification measures not only can efficiently enhance the output of boiler blower

but also could reduce its power dissipationt.