Optimization of Slurry Loop Reactors by Understanding the Complex Mesoscale Structure of Liquid–Solid Flow,ACS Engineering Au

当前位置： X-MOL 学术 › ACS Eng. Au › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Optimization of Slurry Loop Reactors by Understanding the Complex Mesoscale Structure of Liquid–Solid Flow
ACS Engineering Au ( IF 4.3 ) Pub Date : 2022-01-21 , DOI: 10.1021/acsengineeringau.1c00032
Qiushi Xu _{1,

2} , Rongtao Zhou _{1,

2} , Ning Yang _{1,

2} , Alvaro Fernandez ₃ , Philippe Ricoux ₄

Affiliation

Slurry loop reactors have been extensively used in chemical industry, for example, ethylene copolymerization. A classical engineering problem is the timely removal of reaction heat which would otherwise cause particle swelling and aggregation, and thus reactor fouling, operation instability, or even blockage, imposing a high safety risk in production. Lack of knowledge on the mesoscale information of particle swelling and aggregation poses great challenge on the prediction of the macroscale behavior. A swelling-dependent two-fluid model was developed and applied for reactor optimization in this work to account for the evolution of mesoscale structures. The simulation resolves the particle aggregation and plug accumulation in the upstream of the pump and the upper horizontal pipe, revealing the fundamental of reactor blockage. The mesoscale structure, when developing to a certain extent, can cause a sharp increase of pump power consumption. This structure can be characterized by the growth and threshold of the plug volume. Based on this mesoscale understanding, a reactor optimization scheme was heuristically proposed to minimize or eliminate the plug regions by employing two pumps and two cycles.

中文翻译：

通过了解液-固流的复杂中尺度结构优化浆液环流反应器

浆液环管反应器已广泛用于化学工业，例如乙烯共聚。一个经典的工程问题是及时排除反应热，否则会导致颗粒膨胀和聚集，从而导致反应器结垢、运行不稳定甚至堵塞，给生产带来很高的安全风险。缺乏对粒子膨胀和聚集的中尺度信息的了解对宏观行为的预测提出了很大的挑战。在这项工作中开发了一个与膨胀相关的双流体模型并将其应用于反应器优化，以解释中尺度结构的演变。模拟解决了泵上游和上部水平管道的颗粒聚集和堵塞堆积，揭示了反应器堵塞的根本原因。中尺度结构发展到一定程度，会导致泵功耗急剧增加。这种结构可以通过塞体积的增长和阈值来表征。基于这种中尺度理解，启发式地提出了一种反应器优化方案，通过使用两个泵和两个循环来最小化或消除堵塞区域。

更新日期：2022-01-21

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文