苯乙烯热聚合搅拌反应器的数值模拟  

Numerical simulation of thermal polymerization of styrene in stirred reactor

作　　者：周丹[1] 江佳佳[1] 蒋军成[1] 喻源[1] 姚俊[1] 

机构地区：[1]南京工业大学城市建设与安全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,江苏南京210009

出　　处：《化学工程》2015年第12期67-72,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(21436006);江苏省自然科学基金资助项目(BK20141457);中国博士后基金资助项目(2014M561639);江苏省博士后基金资助项目(1401103C);江苏省高校自然科学研究面上项目(15KJB620002)

摘　　要：为了解聚合反应过程的传热规律和反应现象,以苯乙烯热聚合搅拌反应器为研究对象,通过计算流体力学(CFD)方法对苯乙烯热聚合反应的动力学模型进行耦合,建立该反应器的三维非稳态模型。通过UDF添加组分输运方程源项和能量方程源项,研究强放热反应体系热点分布及发展历程。重点考察物料黏度、搅拌速度对聚合反应器内速度场和温度场分布的影响。结果表明:物料黏度的增加,阻碍了远离搅拌桨区域内物料的对流传热,易在反应器顶部形成局部高温;提高搅拌速度可以使反应器内温度分布更加均匀,但会加剧聚合反应,造成反应器内平均温度升高。研究结果为揭示典型化工过程系统热失控的演化机理,预防热失控反应的发生提供了理论依据。In order to obtain the real temperature distribution of the polymerization stirred reactor, the Computational Fluid Dynamics （CFD） method was used to establish a three-dimensional model of the stirred reactor of thermal polymerization of styrene. Adding the sources of component transport equation and energy equation through the UDF （ User Defined Functions）, the hot-spot distribution and development process of highly exothermic reaction system were investigated. The effects of the reaction mass viscosity and stirring speed on the velocity and temperature fields of reactor were studied. The results present that the increase of viscosity obstructs the convective heat transfer of reaction mass away from the impeller, which leads to uneven distribution of temperature in the reactor. The increase of the stirring speed makes the temperature distribution more uniform in the reactor. On the other hand, it exacerbates the polymerization and increases the average temperature in the reactor. This research provides a theoretical basis for revealing the evolution mechanism of thermal runaway reaction and preventing it.

关 键 词：苯乙烯聚合 计算流体力学 物料黏度 搅拌速度 

分 类 号：TQ027.2[化学工程] TQ316.311