隔热耐火材

强制通风冷却的情况下。从炉体表面向周围环境散失的热量:Q散=自然对流散热Qc+辐射散热QrQ散= Qc+Qr=(hc+hr)(t0-ta)式中hc-自然对流传热系数,W/(m·K);hr-辐射传热系数,W/(m·K);t0-炉墙外表面(冷面)的温度,K;ta-外界环境的温度,K。自然对流传热系数(hc)与炉墙的方位有关,垂直炉壁:401.5c ah t t? ?炉顶:402c ah t t? ?炉底:401.1c ah t t? ?4 4002 7 32 7 34 . 8 8 ( ) ( )1 0 0 1 0 0ratt aht t??? ?? ?? ?? ???辐射传热系数(hr)与炉壁外表面(冷面)的黑度?第六章隔热耐火材料-概述炉墙材料的黑体,?0.500.500.480.490.610.80隔热粘土砖0.370.350.320.330.380.56镁砖0.370.340.280.310.370.45氧化铝砖0.220.250.310.330.440.74氧化锆砖0.650.670.680.700.800.98硅砖0.850.880.900.920.930.95碳化硅砖139913161092871649538427温度,℃第六章隔热耐火材料-概述