Serious problems of slagging and low thermal efficiency occurred on a W-shaped flame high-sulfur coal fired boiler.Thus

several countermeasures were taken to carry out optimization adjustment for this boiler

such as properly increasing the operation oxygen content

reducing the coal fineness

closing down the exhaust air damper

opening up the " B" air damper and closing down the " F" air damper.After that

the exhaust temperature dropped from 148.9 ℃to 145.4 ℃

the CO concentration reduced from 675μL/L to37μL/L

the carbon content in fly ash decreased from 5.00%to 2.87%

the unburned carbon loss declined from 2.49%to 1.74%

and the boiler thermal efficiency increased from 89.82%to 90.93%.Furthermore

the slagging amount around the fire hole decreased dramatically

while that at the slag-dredger increased sharply.The slagging problem in furnace was significantly improved.