Release and transformation of potassium during corn straw and coal co-combustion

This paper studies the influence of temperature and corn straw content on release and transformation of potassium during coal and corn straw co-combustion. The results indicate when the corn straw content was lower, released K decreased due to the reactions of KCl with Fe and Ti forming K2O·Fe2O3 and K2TiO3. When the corn straw content was 80 wt%, from 600°C to 1100°C, the release of KCl(g) improved. K existed in ashes as K2SO4 or alumina-silicates. With temperature increasing, the K2SO4 decreased, and the KAlSiO4, KAlSi3O8, and KAlSiO6 increased especially between 900 and 1100°C.