一、引言在许多工业领域广泛应用的蒸汽或物料等输热管道的热损值，不仅是综合反映输热管道热设计、保温材料、施工工艺等总体水平的关键参数，而且是评估待改造管道或新建管道保温节能状况的主要依据。管道热损值还对由蒸汽加热的化工反应装置的工艺温度，从而对反应物的得率 I. INTRODUCTION The heat loss value of heat transfer pipes, such as steam or materials widely used in many industrial fields, is not only a key parameter that comprehensively reflects the overall level of thermal design, insulation materials and construction technology of heat transfer pipes, Or the main basis for the new pipeline insulation energy-saving conditions. The heat loss of the pipe also affects the process temperature of the chemical reaction unit heated by steam so that the yield of reactants