Flow characteristics in a horizontal reactor for continuous preparation of carbon nanotubes

IF 3.8 3区 工程技术 Q3 ENERGY & FUELS Chemical Engineering and Processing - Process Intensification Pub Date : 2024-10-02 DOI:10.1016/j.cep.2024.110013
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Abstract

This study focuses on a sophisticated horizontal reactor designed to facilitate the continuous growth of carbon nanotubes (CNTs) through chemical vapor deposition (CVD). Experimental observations reveal that carbon production varies at different locations within the reactor, with higher yields typically found in the middle and rear zones. The flow dynamics within the reactor play a pivotal role in CNT growth, prompting a detailed simulation of the flow field using Computational Fluid Dynamics (CFD). This simulation leverages fluid dynamics principles to assess the impact of various parameters on the flow field, ultimately identifying the optimal operating conditions. Findings indicate that temperature-induced density contrasts create cyclic flow patterns that can negatively affect CNT growth rates. However, the gas flow inside the horizontal continuous preparation reactor can be improved and optimized by adjusting and controlling the preparation parameters. Appropriately lowering the heating temperature and the mole fraction of propylene in inlet 2, within the range of conditions suitable for the growth of CNTs, while minimizing the perturbation of the flow field by the shape of the carriers, can promote more favorable CNTs growth.

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用于连续制备碳纳米管的水平反应器中的流动特性
本研究的重点是一个复杂的水平反应器,其设计目的是通过化学气相沉积(CVD)促进碳纳米管(CNT)的连续生长。实验观察表明,反应器内不同位置的碳产量各不相同,通常中间和后部区域的碳产量较高。反应器内的流动动力学对碳纳米管的生长起着至关重要的作用,这促使我们使用计算流体动力学(CFD)对流场进行了详细模拟。该模拟利用流体动力学原理评估各种参数对流场的影响,最终确定最佳操作条件。研究结果表明,由温度引起的密度对比会产生循环流动模式,从而对碳纳米管的生长率产生负面影响。然而,通过调整和控制制备参数,可以改善和优化水平连续制备反应器内的气体流动。在适合 CNT 生长的条件范围内,适当降低加热温度和入口 2 中丙烯的分子分数,同时尽量减少载流子形状对流场的干扰,可以促进更有利的 CNT 生长。
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来源期刊
CiteScore
7.80
自引率
9.30%
发文量
408
审稿时长
49 days
期刊介绍: Chemical Engineering and Processing: Process Intensification is intended for practicing researchers in industry and academia, working in the field of Process Engineering and related to the subject of Process Intensification.Articles published in the Journal demonstrate how novel discoveries, developments and theories in the field of Process Engineering and in particular Process Intensification may be used for analysis and design of innovative equipment and processing methods with substantially improved sustainability, efficiency and environmental performance.
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