To solve the fouling and slagging problems of a 260 t/h coal-fired boiler

composite ceramic coating was prepared on the heating surfaces of the boiler. According to the slagging position and by use of thermodynamic calculation method

the best spraying area was obtained

namely the water wall which covers 12 meters along furnace height from the bottom nozzles of the secondary air and has an area of 400 m~2. The boiler statistical running results after three months' service show that

the fouling and slagging situation of this boiler has significant improvement. The furnace temperature is significantly decreased. The monthly blowing frequency of soot blowers is decreased by 95.5%

and the quantity of desurperheater water is reduced by 34.5%. However

this boiler exists the problem that the carbon contents of fly ash and furnace slag are increased after spraying job. The problem can be improved by reducing the coal fineness and other methods. The composite ceramic coating technology provides a better way to solve the problem of boiler slagging.