关键词: 液硫管道, 可拆卸, 夹套管伴热, PT伴热技术, 散热损失, 壁面热阻, 温度分布

Abstract:

Liquid sulfur pipelines in sulfur recovery units usually use steam jacket for thermal maintenance. However, the long manufacturing cycle of steam jacket, high construction difficulty, and easy occurrence of leakage points during use, which has brought great difficulties to users. This article introduces a new type of detachable thermal maintenance technology developed by a certain company, and explores the application of this technology in liquid sulfur pipelines through heat tracing test, theoretical calculation of tracing heat, fluid dynamics simulation calculation. The heat tracing test shows that the ambient temperature liquid sulfur can reach 130 ℃ rapidly by placing proper heat tracing tubes on the liquid sulfur pipeline, which can meet the requirements of the heat tracing performance and cold start-up performance of the liquid sulfur pipeline. On the basis of the heat tracing test, the feasibility of this technique in the application of large caliber liquid sulfur pipelines is further proved by the heat tracing theory calculation and the fluid dynamics simulation calculation. The comparison with steam jacket shows that this technology is superior to steam jacket in safety, convenience and economy, while meeting the demand of heat tracing for liquid sulfur pipelines, therefore, it can be considered as an alternative heat tracing technology for liquid sulfur pipelines.

Key words: liquid sulfur pipeline, detachable, jacket tracing heat, PT heat tracing technology, heat loss, wall thermal resistance, temperature distribution