In this study, thermal history of the particles spouted from each stage burner was investigated, and deposit behavior of char and ash particles to the radiant heat recovery section were discussed by CCSEM analysis and FactSage calculation. A bituminous coal was gasified by a bench scale of atmospheric oxygen blown two-stage gasifier. Char and ashes sample were collected chemical analyses of the samples were carried out by XRD, CCSEM and ICP-AES, etc. The melting behavior of ash was good coincided between TMA results and FactSage calculation. Fine particles taken from upper side of heat recovery section and cyclone collector were almost molten. This result was explained by phase diagram.
