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将模糊数学综合评判法应用于蒸汽管道保温结构优化上,从保温材料本身特性及工况条件改变两个方面对保温结构稳定性进行综合评价。材料特性主要考虑力学特征,包括容重、抗拉强度、抗压强度、抗热震性和线收缩率;工况条件分别考虑正常条件下、管线振动、外力冲击和浸水时热流密度。此方法避免了单一因素分析评价的不全面性及不准确性。评价过程中利用层次分析法(AHP)可得到各因素对保温效果影响的重要程度,最后依据最大隶属度原则评价保温结构的优劣。计算结果与现场试验结论相符合,体现出该方法对保温结构稳定性的评价具有一定指导意义。
The fuzzy mathematics comprehensive evaluation method is applied to optimize the heat preservation structure of the steam pipe. The stability of the heat preservation structure is comprehensively evaluated from the characteristics of the heat preservation material and the change of working conditions. Material properties mainly consider the mechanical characteristics, including bulk density, tensile strength, compressive strength, thermal shock resistance and linear shrinkage; working conditions were considered under normal conditions, pipeline vibration, external impact and heat flux density. This method avoids the incompleteness and inaccuracy of single factor analysis and evaluation. In the process of evaluation, AHP is used to get the degree of importance of each factor on the heat preservation effect. Finally, the advantages and disadvantages of heat preservation structure are evaluated according to the principle of maximum membership degree. The calculation results are consistent with the field test results, which shows that the method is of guiding significance for the evaluation of the stability of thermal insulation structure.