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Impacts of solid physical properties on the performances of a slurry external airlift loop reactor integrating mixing and separation

引用

Chinese Journal of Chemical Engineering 2023年第3期55卷 1-12页

作者： Tian Zhang Qingshan Huang Shujun Geng Aqiang Chen Yan Liu Haidong Zhang School of Chemical Engineering Hebei University of TechnologyTianjin 300130China Key Laboratory of Biofuels Qingdao Institute of Bioenergy and Bioprocess Technology(QIBEBT)Chinese Academy of Sciences(CAS)Qingdao 266101China Dalian National Laboratory for Clean Energy(DNL) Dalian 116023China Innovation Academy for Green Manufacture Institute of Process EngineeringCASBeijing 100190China Synthetic Biology Technology Innovation Center of Shandong Province Qingdao 266101China Shandong Energy Institute Qingdao 266101China

solid physical properties are vital for the design, optimization, and scale-up of gas–liquid–solid multiphase reactors. The complex and interactional effects of the solid physical properties, including particle diameter, density, wettability, and sphericity, on the hydrodynamic behaviors in a new external airlift loop reactor(EALR) integrating mixing and separation are decoupled in this work. Two semi-empirical equations are proposed and validated to predict the overall gas holdup and liquid circulating velocity satisfactorily, and then the individual influence of such solid physical properties is further investigated. The results demonstrate that both the overall gas holdup in the riser and the liquid circulating velocity in the downcomer increase with the contact angle, but decrease with particle size, density, and ***, the impact of the particle size on the liquid circulating velocity is also profoundly revealed on a micro-level considering the particle size distribution. Moreover, the axial solid concentration distribution is discussed, and the uniformity of the slurry is described by the mixing index of the solid particles. The results show that a more homogeneous mixture can be achieved by adding finer particles other than attaining violent turbulence. Therefore, this work lays a foundation for the design, scale-up, and industrialization of the EALRs.

关键词： Slurry reactor Hydrodynamics Particle Mixing solid physical property

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