Abstract
In this work the ash sintering behaviors and effects of aluminum silicates based additives (kaolin, zeolite 24A, and zeolite Y) during combustion of wheat straw and barley husk were investigated. The sintering degrees of fuel ashes and corresponding mixtures with additives were evaluated by performing standard ash fusion tests and laboratory scale sintering tests. The ash chemistry and microstructures were investigated by a combination of X-ray diffraction (XRD) and SEM-EDX analyses. It was found that the wheat straw and barley husk ashes have high sintering and melting tendencies. At elevated temperatures, formation and fusion of low temperature melting potassium salts and potassium silicates contributed to severe sintering of the two fuel ashes. Sintering of the barley husk ash is also associated with the presence of low melting points potassium phosphates with high K/Ca ratios. The experimental results from investigating the reactions between additives and KCl showed that kaolin and zeolite 24A can bot...
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