Abstract:

Higher thermal insulation requirements are proposed for long-distance liquid sulfur transport pipelines due to factors such as the transport medium and the environment etc.The insulation of the pipeline is optimized from the aspects of insulation material and insulation structure. The composite material of aluminum silicate and glass wool is selected, and the maximum use temperature of the material is at least 100 ℃ lower than that of relevant materials listed in GB 50264—2013 or relevant national standards. The energy-saving composite insulation pipe shell is adopted, and the modular design of pipeline construction and installation is carried out to improve the insulation effect. The heat transfer efficiency is improved by combining external heat tracing with heat conducting mastic of three heat tracing pipes. The liquid sulfur pipeline optimally designed has been running stably for more than two years after it was put into use. Compared with the external temperature of the ordinary jacket insulation, that of new pipe insulation is reduced by 8～12 ℃. The heat loss of the pipeline is reduced, and the expected thermal insulation effect is achieved.

Key words: liquid sulphur transport pipelines, insulation design, insulation materials, insulation structure, heat loss, heat tracing

摘要：

长距离液硫输送管线因其输送介质和环境等因素对保温方案提出了更高的要求，因此从保温材料、保温结构等方面对该管线的保温方案进行了优化设计。选用硅酸铝和玻璃棉复合型材料，该材料最高使用温度比GB 50264—2013《工业设备及管道绝热工程设计规范》或者相关国家标准所列的相关材料的最高使用温度至少低100℃;采用节能型复合保温管壳，并对管线施工安装进行模块化设计，提高了保温效果；采用3根伴热管外伴热与导热胶泥相结合的措施，提高了传热效率。新建的长距离液硫输送管道投用后，稳定运行超过2 a,与普通夹套保温层相比，其外侧温度降低了8～12℃,减少了管道热量损失，达到了预期的保温隔热效果。

关键词: 液硫输送管线, 保温设计, 保温材料, 保温结构, 热损失, 伴热