Investigation of Additives to Control Ash Adhesion at High Temperatures

Abstract

Ash particle adhesion at high temperatures is a serious problem in commercial combustion plants. Melting of compounds containing alkali metals is one of the causes of particle adhesion at high temperatures. In this study, an additive has been developed to control ash adhesion at high temperatures. An Al-based additive has been used to suppress the formation of compounds with low melting points in ashes. Furthermore, it has been expected that gases released from the additive during elevating temperatures can form voids in the ash powder bed, resulting in a decrease in the tensile strength of the powder bed. It has been found that the use of aluminum sulfate as an additive effectively decreased adhesion through composition control and void formation.