中文摘要：

在现有过热蒸汽输送管线保温措施基础上,通过设计不同实验方案,对600℃过热蒸汽输送管道保温特性、保温结构以及保温材料选择进行研究,揭示了各层温度随时间变化规律。实验结果表明：在距离输气管外壁一定范围内,设计保温结构必须考虑管壁的辐射传热;在保温层厚度84—200 mm范围内,相同保温层厚度下,相比于无铝箔保温结构（仅泡沫石棉）,覆有7—10层铝箔保温结构（泡沫石棉＋铝箔）可减少热流量30%—70%;稳定阶段,在保温层厚度120 mm处,覆有10层铝箔保温结构比无铝箔保温结构温差高48—102℃,温度梯度高0.41—0.85℃/mm,热流密度前者仅是后者的30%—50%;保温层温度与厚度之间满足四次方多项式关系。最后给出了选择保温材料和优化保温结构参考建议。

英文摘要：

On the basis of the existing insulation measures for the pipeline of superheated steam,the insulation characteristics,insulation structure and selecting insulation materials of 600 ℃ superheated steam pipeline were studied by designing different experimental program,the temperature variation of layers with time was revealed. The results show that the design of wall insulation should consider the radiative heat transfer within a certain range of distance to pipeline outer wall. In the range of 84-200 mm of insulation layer thickness,under the same insulation thickness,the insulation（ foam asbestos ＋ aluminum foil） covered with aluminum foil 7-10 layer can reduce heat flow 30%-70% compared with the non-foil insulation（ foam asbestos only）. In the temperature stabilization phase,the temperature differential of the insulation with aluminum foil is 48-102 ℃ higher than non-foil insulation at the insulation layer thickness of 120 mm,and the temperature gradient of former is 0. 41-0. 85 ℃ / mm higher than the latter,the heat flux of former is only 30%-50% of the latter. It conforms to the fourth polynomial relation between the thickness and the temperature of the insulation layer. Finally,the proposals of selecting insulation materials and optimizing the insulation structure were provided.