In view of serious slagging phenomena frequently occurred in boilers of Zhujiang Power Plant in recent years

various factors leading to slagging in boilers have been analysed from aspect of coal sorts

emphatically coal ash being analysed from components and fusion point of ash

having calculated the correlating parameters between ash components and ash fusion point

summing up four methods for judging tendency of slagging for coals used in power industry

and using the said methods to judge tendency of slagging for coals fired in Zhujiang Power Plant. The results show that the conclusion of judgement is in conformity with the actual slagging situation in Zhujiang Power Plant

providing basis for mixed firing of coal sorts and coal management in power plants.