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乙烯氧化固定床反应器温度场模拟研究 被引量:2

Numerical simulations of temperature field in fixed bed reactor of epoxidation of ethylene over silver catalyst
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摘要 针对乙烯氧化制环氧乙烷固定床反应器,利用YS-7型银催化剂的宏观反应动力学模型和固定床反应器拟均相二维数学模型方法,建立了催化剂床层的质量、热量平衡方程组,并采用Crank-Nicholson差分法对该偏微分方程组进行了数值计算。在模拟计算中,通过改变反应器汽包温度、反应器入口原料气温度、空速以及反应器入口原料气中乙烯、氧气、1,2-二氯乙烷的摩尔分数等工艺条件,系统地研究了以上各工艺条件单因素变化时对整个银催化剂床层温度场的影响。结果表明:随着固定床反应器汽包温度、入口原料气中乙烯、氧气摩尔分数的升高,以及固定床反应器中空速、入口原料气的温度及1,2-二氯乙烷摩尔分数的降低,银催化剂床层温度均有所升高,特别是床层"热点"区域的温度升高较明显。 Aiming at the tubular packed-bed reactor of epoxidation of ethylene, based on the macro-kinetic model of epoxidation of ethylene to form ethylene oxide over a commercial silver catalyst, YS-7, coupled with the mass transport and the heat transport of catalyst bed in industrial reactor for epoxidation of ethylene, the oxidation process was simulated and analyzed by pseudo-homogeneous two-dimensional mathematic model. The distribution of temperature field along the centre axis of tubular packed-bed reactor was studied by changing the normal operation variables respectively, including coolant temperature, feed gas temperature, space velocity, and the concentration of C2 H4, O2 and ethylene dichloride (EDC) inhibitor. The results show that the catalytic bed temperatures, especially the hot-spot temperatures in the bed, are increased with the conditions of the rise of the coolant temperature, the mole fraction of C2H4 and 02, as well as the fall of the feed gas temperature, space velocity, and the mole fraction of EDC.
出处 《化学工程》 CAS CSCD 北大核心 2014年第4期73-78,共6页 Chemical Engineering(China)
关键词 银催化剂 宏观动力学 拟均相 二维数学模型 温度场 silver catalyst macro-kinetic model pseudo-homogeneous two-dimensional mathematic model temperature field
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