Fifteen sets of low-temperature equipment and pipes surface of natural gas processing units in daqing petrochemical research center exists freezing phenomenon in different degree. While cold insulation effect of low-temperature equipment and pipes is good or bad, directly affects the unit energy consumption and light hydrocarbon production. So, analyzing the effect of moisture content on heat transfer of low-temperature pipes cold insulation structure can provide scientific basis for transformation of low-temperature equipment and pipes. The heat transfer model of low-temperature pipes cold insulation structure is established, the effect of moisture content on heat transfer of low-temperature pipes cold insulation structure in different insulating layer thickness and medium temperature are analyzed. The results show that, (1) with increase of moisture content in cold insulation structure, heat flux and cold loss increased in same diameter and medium temperature. Similarly, with increase of insulating layer thickness, heat flux and cold loss decreased. (2) with increase of moisture content in cold insulation structure, heat flux and cold loss increased in same diameter, insulating layer thickness and medium temperature. Similarly, when moisture content is the same, with decrease of medium temperature in pipes, heat flux and cold loss in creased.%大庆油田天然气分公司15套天然气处理装置低温设备及管道外表面,均不同程度地存在结冰现象.而低温设备及管道保冷效果的好坏,直接影响到装置的能耗以及轻烃产量.因此,分析含水对低温管道保冷结构传热的影响,能够为今后低温装置及管道保冷相关改造提供科学依据.通过建立含水低温管道保冷结构传热模型,分析不同保冷厚度、不同管道介质温度下含水对低温管道保冷结构传热的影响.研究结果表明:(1)同一管径及介质温度下,随着保冷结构中含水率的增大,热流密度变大,冷损失变大；同样,含水率相同时,随着保冷厚度的增大,热流密度减小,冷损失减小.(2)在管径、保冷厚度及介质温度相同情况下,随着保冷结构中含水率的增大,热流密度变大,冷损失变大；同样的,含水率相同时,随着管道中介质温度的降低,热流密度变大,冷损失变大.
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