化工建筑设备用的微孔保温毯性能测定及应用

摘要

The chemical construction equipment with microporous insulation blanket has an important effect on the product.A new kind of microporous insulation material was developed with SiO2,MgO and SiC as the main components,the particle size of the inorganic aggregation in the structure of the insulation material was 10～35 nm,forming a semi-closed convection space in nanometer grade,in which the heat loss caused by the convection process was reduced efficiently.The thermal conductivity of the microporous insulation material was tested,and the insulation properties were characterized and compared with the common ceramic fiber.At the same temperature,the thermal conductivity of the microporous insulation material was lower than that of the common ceramic fiber,and with the same insulating thickness,the lower heat loss and cold face temperature of the microporous insulation material indicating the better insulating capacity.Then the microporous insulation material was used as the inner insulation of a fumace instead of the common ceramic fiber,the optimum insulation thickness of the microporous insulation material was calculated at 40 mm,just half of that of the common ceramic fiber,and the cold temperature was 49℃,12℃ lower than that of the common ceramic fiber,and 37％ heat loss was reduced.%化工建筑设备用的微孔保温毯对产品有着重要影响.新开发出一种新型微孔保温毯,主要成份为SiO2,MgO和SiC,粒子直径为10～35nm,粒子之间的空隙能够形成一个纳米级的半封闭的热对流场所,可以有效抵消热对流方式导致的热能损失.对该新型微孔保温毯的导热系数进行了测试,并且与之前一直使用的普通硅酸铝陶瓷纤维毯的保温性能进行了对比测试,在相同的温度下,新型微孔保温毯的导热系数明显低于普通陶瓷纤维毯,显示出更加优良的阻热性能.然后将两种保温材料应用于砖砌高温窑炉的内层保温铺敷,以期得到实际应用下的保温性能对比.由系统计算的最优保温厚度和冷面温度分别为40mm和49℃,仅为原有普通陶瓷纤维棉厚度的一半,而冷面温度却可以降低12℃,并且全年间可减少37％的热能损失.