Correlative analysis of coal ash composition and ash fusion

In order to study the influence of coal ash composition on ash fusion in Ordos,the effect of total acid,total alkalinity,acid-base ratio,melt index FI and coal ash content on ash fusion were analyzed.The regression equation of coal ash melting temperature was obtained by combining the MATLAB simulation.The results show that with the increase of acid-base ratio,the melting temperature of coal ash gradually increases,likewise,the melting temperature of coal ash increases significantly with the acid-base ratio over 3. 65. According to the gray melting temperature regression formula,the minimum FI value of the melt index is 35. 67%,and the prediction formula of the melt index could not reflect the trend of the FT.In gasification coal,the ash melting temperature is determined by many kinds of minerals. When the Si/Al ratio is less than 3 and the CaO content is less than 30%,the coal ash has a lower melting temperature.When the content of CaO exceeds 30% and the content of Fe_2O_3 exceeds 20%,monomeric CaO and FeO are usually produced,while the monomer CaO and FeO have higher melting temperature,so that the melting temperature of coal ash also increases accordingly.