Study on Fusion Characteristics of Ash Produced by Co-combustion Biomass and High-sulfur Low Grade Coal

The study about co-combustion characteristics of biomass and coal has been paid more attention by the domestic and foreign scholars.Fusion characteristics of ash produced by co-combustion biomass and high-sulfur low grade coal were researched.Ash melting point temperature was measured.The process of ash melting was studied by the method of thermogravimetry-differential scanning calorimetry(TG-DSC).The results of experiments show that ash melting point temperature drop when co-firing biomass.With the increase of biomass co-combustion ratio,ash melting point temperature drop more obviously.Because the ash content of biomass is much less than high-sulfur low grade coal,ash melting point temperature of co-combustion ash is mainly affected by coal ash.Because the differences of constituent parts and contents of ash,the TG-DSC curves of coal ash and biomass ash in the experimental temperature range are quite different.When biomass co-combustion ratio is low,TG-DSC curves basically reflect fusion characteristics of coal ash.With the increase of biomass co-combustion proportion,the influence of biomass on TG-DSC curves become obviously.