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国家自然科学基金(51276181)

作品数:4 被引量:7H指数:2
相关作者:周小明段彦军淮秀兰李勋锋更多>>
相关机构:中国科学院更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:化学工程动力工程及工程热物理更多>>

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3D CFD modeling of acetone hydrogenation in fixed bed reactor with spherical particles被引量:7
2013年
Acetone hydrogenation in a fixed bed reactor packed with spherical catalyst particles was simulated to study the effects of inlet gas velocity and particle diameter on hydrogenation reaction. Computational results show that the catalyst particles in the reactor are almost isothermal, and the high isopropanol concentration appears at the lee of the particles. With the increase of inlet velocity, the outlet isopropanol mole fraction decreases, and the total pressure drop increases drastically. Small diameter catalyst particles are favorable for acetone hydrogenation, but result in large pressure drop.
Xiaoming ZhouYanjun DuanXiulan HuaiXunfeng Li
Acetone hydrogenation in exothermic reactor of an isopropanol–acetone–hydrogen chemical heat pump: effect of intra-particle mass and heat transfer
2014年
Intra-particle mass and heat transfer plays an important role in performance of the exothermic fixed-bed reactor for an isopropanol–acetone–hydrogen chemical heat pump. In this work, an exothermic fixed-bed reactor model, taking into account the actual packing structure, is established in the commercial software Fluent. A 120°segment of a tube with tube-to-particle diameter ratio(n) of4, where realistic particles are packed and set to porous media, is used to simulate the 3D external flow, concentration and temperature fields in the exothermic packed-bed reactor. The influence of catalyst particle diameter(dp) and micropore diameter(d0) on the intra-particle temperature,species distribution, reaction rate and selectivity is discussed. The appropriate dpand d0 are obtained. Simulation results showed that intra-particle temperature gradient is not obvious. Large dpand small d0 lead to remarkable gradient of reaction rate inside the catalyst particle and the decrease in the catalyst efficiency and reduce the acetone conversion and the selectivity in isopropanol. The optimal results reveal that the spherical catalyst with dpof 1 mm and dporeof 10 nm is appropriate for high-temperature acetone hydrogenation.
Yanjun DuanMin XuXiulan HuaiXunfeng Li
关键词:化学热泵
A structured packed-bed reactor designed for exothermic hydrogenation of acetone被引量:2
2014年
Fixed-bed reactors randomly packed with catalysts have many disadvantages that may adversely affect the desired chemical reaction.The increasingly used monolithic reactor,in contrast,has many operational advantages;however,for a kinetically-controlled reaction,it does not contain sufficient catalyst to sustain the reaction.To address the problems associated with both randomly packed-bed reactor and the monolithic reactor,a structured packed-bed reactor was proposed and mathematical models were built for randomly packed-bed reactor and structured packed-bed reactor.Their respective performances were compared when applied to the exothermic reaction of the isopropanol-acetone-hydrogen chemical heat pump system.The results showed that the structured packed-bed reactor performed better in terms of pressure drop and heat transfer capacity,and had a lower radial temperature gradient,indicating that this reactor had a higher effective heat conductivity.Isopropanol on the catalyst particle surfaces was more concentrated near the tube wall because a wall effect existed in the boundary layer around the particle-wall contact points.
Yanjun DuanMin XuXiaoming ZhouXiulan Huai
催化剂颗粒布置方式对丙酮加氢反应的影响
2013年
对固定床反应器中丙酮加氢放热反应进行了二维数值模拟,研究了催化剂颗粒布置方式对丙酮加氢反应、流动及传热特性的影响。结果显示,催化剂颗粒布置方式的变化能够改变反应器内流场、温度场和浓度场的分布;当催化剂颗粒轴线与反应器轴线的夹角θ=0°时反应器内异丙醇的质量分数最大,且随着夹角的增大异丙醇质量分数的最大值逐渐减小;反应器内温度最大值出现在夹角θ=0°,而最小值则出现在θ=60°。通过催化剂颗粒布置角度的变化,增大流场的扰动可以提高反应器壁面温度,从而提高反应器性能。
周小明段彦军淮秀兰李勋锋
关键词:化学热泵固定床反应器
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