环氧乙烷间歇进料系统的安全分析及设计优化

SAFETY ANALYSIS AND DESIGN OPTIMIZATION OF ETHYLENE OXIDE INTERMITTENT FEED SYSTEM

分别就某装置环氧乙烷输送及进料系统界区外和界区内的原始设计情况进行安全风险分析。对界区外环氧乙烷环管设置进行优化,避免了间断进料过程中造成的环氧乙烷死区,提高了装置操作的安全性。对界区内有蒸汽伴热的环氧乙烷进料系统管线传热进行了理论计算,定量计算出在切断阀紧急切断情况下,环氧乙烷管线能够忍受的热膨胀温升和加热时间;对界区内进料系统进行优化,避免了装置在紧急情况下因环氧乙烷受热超压、管线破裂而导致的环氧乙烷泄漏风险。

This paper makes safety risk analysis on the original design of ethylene oxide feed and transportation system inside and outside the boundary zone respectively. The ring tube arrangement of ethylene oxide outside the boundary zone is optimized to avoid the dead zone of ethylene oxide caused by intermittent feed and the safety of the plant operation is improved. The paper carries out theoretical calculation of the heat transfer of the ethylene oxide feed system with steam tracing within the boundary zone. The thermal expansion caused by temperature rise and the heating time are calculated quantitatively when the cut-off valve is shut down. The feed system within the boundary zone is optimized to avoid the risk of ethylene oxide leakage due to the overpressure caused by excessive heating and pipeline rupture in case of emergency.