Existing researches showed that the slagging of Zhundong coal will be prevented to a certain extent by adding kaolin. However

most of the existing studies are conducted under laboratory conditions

the combustion characteristics in the laboratory are very different to the actual boilers. To reveal the anti slagging effect of kaolin on an actual boiler

a field experiment was carried out on a boiler burning Zhundong coal. A slagging probe was put into the furnace to simulate the water wall of the boiler. The pulverized kaolin was transported by the air and jet onto the surface of the slagging probe to verify the effect of anti slagging. The results show that

the anti slagging effect depends on the component of kaolin itself directly. The slagging of Zhundong coal will not be prevented by adding kaolin if the alkali metal content in the kaolin is too high.