化工学报 ›› 2022, Vol. 73 ›› Issue (10): 4551-4564.DOI: 10.11949/0438-1157.20220753

• 过程系统工程 • 上一篇    下一篇

乙炔加氢串联反应器全周期乙炔转化率最优分配研究

王峥(), 许锋, 罗雄麟()   

  1. 中国石油大学(北京)信息科学与工程学院自动化系,北京 102249
  • 收稿日期:2022-05-27 修回日期:2022-06-27 出版日期:2022-10-05 发布日期:2022-11-02
  • 通讯作者: 罗雄麟
  • 作者简介:王峥(1996—),男,硕士研究生,wangzheng_pcx@163.com
  • 基金资助:
    国家自然科学基金项目(21676295)

Full-cycle optimization of acetylene conversion distribution for acetylene hydrogenation beds-in-series reactor

Zheng WANG(), Feng XU, Xionglin LUO()   

  1. Department of Automation, College of Information Science and Engineering, China University of Petroleum, Beijing 102249, China
  • Received:2022-05-27 Revised:2022-06-27 Online:2022-10-05 Published:2022-11-02
  • Contact: Xionglin LUO

摘要:

在乙炔加氢反应器的实际生产运行过程中,乙炔加氢反应大部分在第一床层,加氢反应放出的大量热量使得床层内温度高于最佳反应温度范围,致使乙烯选择性降低,乙烯产量下降,而在进行全周期操作优化时并未考虑到此问题。因此,首先考虑温度对绿油累积的影响,修正了催化剂失活动力学方程;其次,为保证反应器各床层内温度都在最佳反应温度范围,从化学反应工程理论和实际生产过程中的安全性两个角度出发,给出两种反应器各床层乙炔转化率分配方案;最后,在常规全周期操作优化模型中添加乙炔转化率约束,建立全周期乙炔转化率分配操作优化模型,并对两种乙炔转化率分配方案进行全周期操作优化。优化结果表明,两种乙炔转化率分配方案操作优化的乙烯产量要远远高于常规操作优化,且乙炔转化率方案为33∶33∶33时,乙烯产量最高,而考虑实际生产过程中的安全性,乙炔转化率分配方案为43∶47∶10时具有更好的效果。

关键词: 过程系统, 过程优化, 乙炔加氢反应器, 乙炔转化率分配, 催化剂失活

Abstract:

During the commercial operation of acetylene hydrogenation three-beds-in-series reactor, most of acetylene hydrogenation reaction is in the first bed, the large amount of heat released by the hydrogenation reaction makes the temperature in the bed higher than the optimal reaction temperature range,which leads to the decrease of ethylene selectivity and the decrease of ethylene yield. This problem was not taken into account in the whole cycle operation optimization. Therefore, this paper first considers the effect of temperature on the accumulation of green oil, and corrects the kinetic equation of catalyst deactivation. Secondly, in order to ensure that the temperature in each bed of the reactor is within the most suitable temperature range for reaction, two schemes of acetylene conversion rate distribution in each bed of the reactor are given from the perspectives of chemical reaction engineering theory and safety in actual production process. Finally, the constraint of acetylene conversion rate is added to the conventional full-cycle operation optimization model, and the full-cycle operation optimization model of acetylene conversion rate distribution is established, and two schemes of acetylene conversion rate distribution are optimized. The optimization results show that the ethylene yield optimized by the two acetylene conversion distribution schemes is much higher than that optimized by the conventional operation, and the ethylene yield is the highest when the acetylene conversion scheme is 33∶33∶33. Considering the safety in the actual production process, the acetylene conversion distribution scheme is 43∶47∶10, which has a better result.

Key words: process system, process optimization, acetylene hydrogenation reactor, acetylene conversion distribution, catalyst deactivation

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