以1250 ℃轧钢加热炉和1600 ℃隧道窑2种典型的连续热工窑炉为例,通过对不同炉衬耐火材料结构组合的综合传热系数、热流密度和炉墙温度场的传热学计算,结合耐火纤维、耐火浇注料、轻质耐火砖、Al_3O_2空心球砖及镁砖等炉衬材料的几种炉衬结构的传热分析,给出了相应窑衬结构的热导率改变对热流密度和炉墙外壁温度的影响,表明采用轻质绝热耐火材料和耐火纤维的复合窑衬结构其炉墙热流密度大大降低.计算结果显示体现工业窑炉炉衬耐火节能一体化优势的窑衬结构为:1250 ℃轧钢加热炉采用105 mm纤维板+230 mm JM23绝热保温砖+115 mm轻质莫来石耐火砖的窑衬结构;1600 ℃隧道窑采用110 mm纤维板+115 mm JM23绝热保温砖+115 mm轻质莫来石耐火砖+160 mm Al_3O_2空心球砖的窑衬结构.
Heat transfer computation of complex heat transfer coefficient, heat flux and temperature field of furnace wall are discussed for different furnace lining structure of two types of continuous heating furnace, namely steel rolling furnace(1250 ℃) and tunnel kiln (1600℃). The influence of thermal conductivity on heat flux and surface temperature is given with furnace wall of several material refractories, such as fibre, castable, light brick,alumina bubble brick,magnesia brick and composite lining, and the results show that heat flux is greatly reduced using light-weight refractory. In the result of calculation the furnace lining structures integrated both with advantages of high-temperature protection and energy saving are: 1250 ℃ steel rolling furnace with 105 mm fiberboard, 230 mm JM23 insulating brick and 115 mm light mullite firebrick; 1600 ℃ tunnel kiln with 110 mm fiberboard , 115 mm JM23 insulating brick, 115 mm light mullite firebrick and 160 alumina bubble brick.
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