Abstract
Publisher Summary This chapter discusses a new process to produce a heat insulator from pressurized fluidized bed coal combustor (PFBC) ash. The density of the heat insulator produced is larger than that of B1 brick; its thermal conductivity is considerably smaller and also the compressive strength is better than that of B1 brick. To utilize the PFBC ash, various materials are tried to be produced. However, most of them could not economically succeed to develop the industrial process. PFBC ash consists of the fly ash collected from the cyclones and the filter and of the boiler ash discharged from the combustor. The fly ash contains mainly SiO 2 , Al 2 O 3, and Fe 2 O 3 . The boiler ash contains more calcium compounds, such as CaSO 4 , unreacted CaO, and CaCO 3 .
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