新型多腔孔陶瓷复合绝热材料保温性能测试

Thermal Insulation Performance Testing on New Composite Ceramic Insulation Materials

热力设备和管道保温对降低机组能耗有重要意义。将新型多腔孔陶瓷复合保温材料用于华能丹东电厂350 MW机组的部分设备和管道上,并测试了该新型保温材料的保温层表面温度、表面散热损失、实际使用厚度等;同时,将实际测试结果与实验室中热流密度、保温材料温度随厚度的变化测试结果分析比较,并利用扫描电子显微图片分析了材料结构对材料保温性能的影响。实验结果表明,新型多腔孔陶瓷复合保温材料的孔隙尺寸小、导热路径长并具有多级配结构,因而保温效果好;使用该新型保温材料的设备(如燃烧器)外表面温度低于国家标准规定值;该复合保温材料热流密度值小,仅为158 W/m2,远低于国标规定的最大散热损失266 W/m2;与硅酸铝棉保温材料相比,达到同样保温效果时,使用厚度可降低65%。

The insulation of thermal equipments and pipes is of great importance to reduce the energy consumption. In this paper, a new type of ceramic composite insulation material is applied in some of the equipment and piping ofa 350-MW unit in Huaneng Dandong Power Plant 350 MW and corresponding testing is conducted regarding the surface temperature, surface heat losses and actual thickness, etc. In addition, the testing results are compared with the laboratory testing result data such as heat flux and material temperature change with respect to thickness variations. Then by virtue of the scanning electron microscopy images the impact of the material structure on the thermal insulation properties is analyzed. The experiment results show that the novel material has outstanding insulation performance due to its smaller pore size and longer heat conduction path with multilevel structure. With this novel thermal insulation material the outer surface temperature of the equipment （such as the burner） is lower than the limit specified in the national standard. The heat flow density value is only about 158 W/m^2, which is far below the maximum limit of 266 W/m^2 in the national standard. Compared with the aluminum silicate cotton insulation material, the material thickness can also be reduced by 65% for the same heat preservation effect.