By a 200 kW fouling test furnace

fouling and slagging characteristics of coal in south mine of Huolinhe coalfield was investigated.Results show that

coal in south mine has serious slagging and fouling tendency.The fouling is caused by calcium compound and sodium salt

while the compounds such as Fe2O3-CaO with low melting point

silicate or composite silicate which formed during the combustion is the main reason for slagging.Thus

to ensure the normal operation of the boiler

proper thermal loading parameters should be adopted

and different soot blowers should be arranged reasonably inside the furnace to prevent the heating surface from fouling and slagging.