热风炉格子砖内气体的传热参数

Heat Transfer Parameters of Gas in Checker Bricks of Hot Stove

建立了热风炉蓄热室格子砖二维温度场数学模型,研究了不同类型格子砖内气体的传热参数.结果表明,使用高效小孔格子砖可同时提高加热面积和对流换热系数,37孔格子砖的换热速度是19孔格子砖的1.8倍,19孔格子砖的换热速度是7孔格子砖的1.6倍.但随格孔直径减小,压力损失明显提高.当格孔直径为30mm、活面积为0.36时,风温可达1206℃,且压力损失处于激变区和缓变区之间.因此,在新建和改造的热风炉上可采用19孔格子砖获得良好的热工指标.

A two-dimensional mathematical model of checker bricks in hot stove was established. The influences of different types of checker brick on the heat transfer parameters of gas were studied. Efficient microporous checker brick can improve the heating area and heat convection coefficient. 37 hole checker brick has about 1.8 times of the average heat exchange of 19 hole checker brick, 19 hole checker brick about 1.6 times of the average heat exchange of 7 hole checker brick. As the hole diameter decreases, the pressure loss increases. When the hole diameter and void area are 30 mm and 0.36, respectively, the blast temperature can reach 1206 ℃ and the pressure loss is between drastic and gradual regions. A good thermotechnical index can be achieved by using 19 hole checker brick in the newly built and reconstructed hot stove.