Structural Determination of Silica-Based Fire-Proof Heat Insulation

摘要

Many power plants need fire prevention measures that protect electric cables from fire incidents until the rescue from the fire department arrives. The purpose of this research is to verify performances of laminated fire-proof insulation developed by Imae Industry Co. Ltd. in Japan. The insulation includes sequential stacking of silica mats, aluminum foils, and aluminized glass-fiber woven fabrics that are placed all together inside the outermost layer of silica cloth. This research also aims to apply expanded graphite sheets and aerogel papers to make the structure more efficient. The optimum stacking sequence is verified with aids of combustion experiments and heat conduction simulations by 3D-FEM analysis. It is revealed that the graphite layer positioned near the fire can disperse and transfer heat effectively to the whole area of silica mats which generate more condensation reaction. The heat is further insulated by the aerogel layer which has the lowest thermal conductivity among incombustible materials.