目的 针对某含炸药组合件遭遇意外火灾事故时发生爆炸的问题，提出在药柱端加装防火隔热结构，以便延缓炸药温升，避免炸药发生爆炸反应。方法 采用有限元热分析方法，建立包含炸药热分解反应的数学模型，通过分析该组合件在火灾环境下热量传递的关键环节及响应规律，基于经济性、轻便性、可操作性等原则，采取针对性热控措施，在药柱端设计三层夹心防火隔热结构，并将内层钢壳壁面进行磨光处理，以降低表面热辐射率，同时，取消对接法兰间螺栓连接方式，以避免热“短路”。结论 数值分析和试验研究结果均表明，该结构有效延缓了组合件内炸药的温升，可避免其在意外火灾事故环境下的热爆炸反应，有助于提升组合件的储运安全性。

The work aims to put forward a fireproof thermal insulation structure to be fixed on the grain end against the blast of explosive-containing assembly in an accidental fire in order to lower the explosive part’s temperature rise and avoid explosive blast. The mathematical model involving explosive thermal decomposition reaction was established by finite element thermal analysis. The crucial process in the course of heat transfer and general laws of thermal responses of the assembly in fire accident were analyzed. In view of the economical, portable and operable design principle, a lot of very pertinent thermal control measures were adopted to design a three-layer fireproof thermal insulation on the grain end. The inlayer steel shell surface was polished so as to reduce surface thermal radiation. Meanwhile bolted connection among butt flanges was canceled to avoid thermal short circuit. In conclusion, the numerical analysis and experimental results show that the structure can effectively delay the explosive part’s temperature rise, prevent explosive reaction in accidental fire and help improve the safety of the containing explosive assembly.