Formation and Motion of Transversal Hot Zones in Packed Bed Reactors

在商业填充床反应器中可能会形成横向热区，并且可能是有害的，因为它们可能会降低所需产品的产量，使催化剂失活并引发失控反应，最终可能导致爆炸。PI计划对热区形成和动力学进行实验和理论数值研究。这个问题在学术上和工程上都很重要，因为目标不仅仅是观察、分析和描述这些热区，而是获得预测和控制它们的能力。PI计划使用红外成像仪对两个测试反应进行热区形成和运动的实验研究：一氧化碳氧化和乙炔氢化。这些实验将用于确定在什么条件下形成热区及其特征运动是什么。三维两相模型的数值模拟将用于了解均匀填充床反应器中影响热区形成的临界速率过程和参数。该模型将为实验研究和实验观测的组织提供有趣区域的指导。影响：热点和热点区是填料床反应器的一个长期问题。从第一负责人那里提供如何避免或控制它们的指导，将对化学制造系统的工业操作具有重大的安全效益。

Transversal hot zones can form in commercial packed-bed reactors and may be deleterious because they may decrease the yield of the desired products, deactivate the catalyst and initiate runaway reactions that may ultimately result in explosions. The PI plans to conduct experiments and theoretical numerical studies on hot zone formation and dynamics. The problem is of both academic interest and engineering importance as the goal is not just to observe, analyze and characterize such hot zones, but to gain the ability to predict and control them. The PI plans experimental studies using an infrared imager of hot zone formation and motion for two test reactions: the oxidation of carbon monoxide and acetylene hydrogenation. These experiments will be used to determine under what conditions hot zones form and what are their characteristic motions. Numerical simulations of a three-dimensional two-phase model will be used to gain an understanding of the critical rate processes and parameters affecting hot zone formation in a uniform packed bed reactor. The model will provide guidance about interesting regions for experimental study and for the organization of experimental observations.Impact:Hot spots and hot zones are a perennial problem of packed bed reactors. Providing guidance from first principals on how to avoid or control them would have significant safety benefits for the industrial operation of chemical manufacturing systems.