苯乙烯聚合反应热失控及其紧急抑制的数值模拟

发布时间：2018-04-11 09:48

本文选题：苯乙烯聚合 + 计算流体力学　；参考：《高校化学工程学报》2016年03期

【摘要】：为实现对反应热失控行为的在线监控与紧急抑制,采用计算流体力学方法(CFD)结合苯乙烯热引发本体聚合反应的热动力学模型,建立苯乙烯热聚合反应的三维非稳态模型,并对该反应体系热点分布及发展历程进行研究,分析冷却稀释剂注入位置对反应热失控的抑制效果及热点消除的影响规律。结果表明:随着苯乙烯聚合反应的进行,物料黏度迅速增加,减缓了远离搅拌桨区域内物料的对流传热,造成该区域内热点集聚。反应抑制方面,在桨叶区注入冷却稀释剂时反应器内平均温度最低,而在热点集聚区域注入可以更加有效地控制热点的形成,减缓失控速率。研究通过反应器内温度分布与系统散度判据相结合的方法,为反应器传感器的优化布置、热失控反应的预防与控制提供了理论依据。
[Abstract]:In order to realize the on-line monitoring and emergency suppression of the reaction heat runaway behavior, a three-dimensional unsteady model of styrene thermal polymerization was established by using the computational fluid dynamics (CFD) method and the thermodynamics model of styrene thermal initiated bulk polymerization.The hot spot distribution and development process of the reaction system were studied, and the effect of the injection position of the cooling diluent on the reaction heat runaway and the hot spot elimination was analyzed.The results show that with the polymerization of styrene, the viscosity of the materials increases rapidly, which slows the convection heat transfer of the materials far away from the impeller, resulting in the hot spots in the region.In reaction inhibition, the average temperature in the reactor is the lowest when the cooling diluent is injected into the blade area, but the hot spot formation can be more effectively controlled and the runaway rate can be slowed down by the injection in the hot spot concentration area.By combining the temperature distribution in the reactor with the criterion of system divergence, this paper provides a theoretical basis for the optimal arrangement of the reactor sensor and the prevention and control of the thermal runaway reaction.
【作者单位】：南京工业大学安全科学与工程学院江苏省危险化学品本质安全与控制技术重点实验室;
【基金】：国家自然科学重点基金(21436006) 江苏省自然科学基金(BK20141457、BK20150953) 江苏省高校自然科学研究面上项目(15KJB620002) 中国博士后基金(2014M561639) 江苏省博士后基金(1401103C)
【分类号】：O631.5

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