大型炼化装置电伴热设计总结

Summary of electrical heat tracing design for large refining and chemical plant

相比传统伴热方式,电伴热具有效率高、温控精确、节能、施工简单、费用低等优点。文中结合某大型炼油石化装置分析了电伴热在大型石化设计项目中的应用,介绍了电伴热系统的组成和基本原理。通过实际算例进行散热计算、电伴热带长度计算、伴热带选型、设计汇料,着重分析了自限温伴热带、恒功率伴热带在管道电伴热中的设计步骤;总结了电伴热设计流程以及设计中存在的安全系数过大、设计精度不高造成的投资过高等问题;最后展望了电伴热设计与三维管道设计进一步密切结合,以实现自动电伴热选型、自动汇料的更加高效、精确设计思路。期望能对同类项目的自限温、恒功率电伴热设计具有参考意义。

Compared with the traditional heat tracing method,the electrical heat tracing system has the advantages of high efficiency,accurate temperature control,energy saving,simple construction and low cost.Based on the analysis of the application of electrical heat tracing in a large petrochemical project,this paper introduces the composition and basic principle of the electrical heat tracing system.The calculation of heat dissipation,the calculation of the length of the electrical heat tracing band,the type selection of the heat tracing band and material computation are carried out through practical calculation examples.The design steps of the self-limiting heat tracing band and the constant power heat tracing band in the electrical heat tracing of pipelines are emphatically analyzed.The design process of electrical heat tracing and the problems of high investment caused by too large safety factor and low design accuracy in the design are also discussed.Finally,the further close combination of electrical heat tracing design and three-dimensional pipeline design is prospected to realize the more efficient and accurate design idea of automatic electrical heat tracing selection and automatic material computation.It has reference significance for the design of self-limiting temperature and constant power electrical heat tracing of similar projects.