管式固定床反应器中Fe基费托合成的多物理场耦合数值分析

发布时间：2018-01-01 01:28

本文关键词：管式固定床反应器中Fe基费托合成的多物理场耦合数值分析　出处：《石油学报(石油加工)》2016年03期 　论文类型：期刊论文

【摘要】：通过构建包含动量、能量、质量传递以及化学反应动力学方程的多物理场耦合数值模型,计算了Fe基催化剂管式固定床反应器中的费托合成过程,分析了费托合成管式反应通道中的速度、压力与温度分布,以及温度、流速和反应物n(H_2)/n(CO)3个因素对产物选择性的影响,阐明了沿着气体流动方向的反应速率变化趋势。结果表明,催化剂段入口处存在"热点"区域;在费托合成烃类产物中,CH_4的碳原子选择性最高,其次是C5+类产物;C_(5+)产物的选择性随着温度、流速和n(H_2)/n(CO)的增大均有所降低。构建的数值模型及相关结论有助于从传递及反应过程的角度,为固定床反应器内费托合成操作工艺的优化提供理论参考。
[Abstract]:The Fischer synthesis process in a Fe-based catalyst tubular fixed-bed reactor was calculated by constructing a multi-physical field coupled numerical model with momentum, energy, mass transfer and chemical reaction kinetics equations. The effects of velocity, pressure and temperature distribution, temperature, flow rate and reactant nnco on the selectivity of the product were analyzed. The change trend of reaction rate along the direction of gas flow is clarified. The results show that there is a "hot spot" region at the entrance of the catalyst section. Among the hydrocarbon products synthesized by Fischer, CHS _ 4 has the highest selectivity for carbon atom, followed by C _ 5; The selectivity of Che _ 5) products decreased with the increase of temperature, flow rate and the increase of n _ (2 / n ~ (-1) C _ (O)). The established numerical model and related conclusions are helpful in terms of transport and reaction process. It provides a theoretical reference for the optimization of Fischer synthesis process in a fixed bed reactor.
【作者单位】：华东理工大学机械与动力工程学院;
【基金】：中央高校基本科研业务费探索基金项目(WG1414044)资助
【分类号】：TQ052;TQ529.2
【正文快照】： 费托合成(Fischer-Tropsch synthesis)是指合成气(CO和H2)在催化剂及一定的反应条件下转化生成烃类等的反应,其产物包括多种碳链长度不同的烷烃、烯烃、醇、醛和酸等有机化合物[1]。近年来,随着煤化工技术的不断发展,煤制合成气,再进一步通过费托合成反应转化为液体燃料的工艺

【相似文献】