Numerical Simulation Study on Plasma Rapid Heater of Methane

IF 2.6 3区物理与天体物理 Q3 ENGINEERING, CHEMICAL

Plasma Chemistry and Plasma Processing Pub Date : 2023-12-27 DOI:10.1007/s11090-023-10433-9

Shaopeng Wang, Defu Kong, Xianhui Chen, Cheng Wang, Weidong Xia

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Abstract

In this paper, we present a plasma rapid heater (PRH) designed to uniformly heat methane with electric arc thermal plasma and reduce loss rate. Our model uses a simplified and detailed mechanism to analyze the rapid and intense mixing process between a plasma mainstream and circumferential cold jets of methane in a hydrogen environment. The research focuses on three areas: the plasma mainstream section, the circumferential jet mixing chamber, and the reaction chamber. We investigate the characteristics of the mainstream and explore the impact of the jet momentum ratio on the mixing process and the losses from methane heating. We explain these phenomena using Damkohler numbers to demonstrate the relationship from a time-scale perspective. The findings indicate that an increased momentum ratio improves mixing, reduces temperature and material non-uniformity, and minimizes losses from pyrolysis during methane heating. Additionally, we provide a formula for calculating the penetration depth of the jet. The examination of Damkohler numbers also suggests that the momentum ratio primarily reduces methane losses by extending the reaction time scale. This work offers guidance on extending the usage of plasma heaters and integrating them into other industry processes in the future.

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甲烷等离子体快速加热器的数值模拟研究

本文介绍了一种等离子体快速加热器（PRH），旨在利用电弧热等离子体均匀加热甲烷并降低损耗率。我们的模型采用简化和详细的机制来分析等离子体主流和甲烷圆周冷射流在氢环境中的快速和强烈混合过程。研究主要集中在三个方面：等离子体主流部分、圆周射流混合室和反应室。我们研究了主流的特性，并探讨了射流动量比对混合过程和甲烷加热损失的影响。我们使用达姆克勒数来解释这些现象，从时间尺度的角度来说明其中的关系。研究结果表明，增大动量比可以改善混合，减少温度和材料的不均匀性，并将甲烷加热过程中的热解损失降至最低。此外，我们还提供了计算射流穿透深度的公式。对达姆科勒数的研究还表明，动量比主要通过延长反应时间尺度来减少甲烷损失。这项研究为今后扩大等离子加热器的使用范围并将其融入其他工业流程提供了指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Plasma Chemistry and Plasma Processing 工程技术-工程：化工

CiteScore

5.90

自引率

8.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Publishing original papers on fundamental and applied research in plasma chemistry and plasma processing, the scope of this journal includes processing plasmas ranging from non-thermal plasmas to thermal plasmas, and fundamental plasma studies as well as studies of specific plasma applications. Such applications include but are not limited to plasma catalysis, environmental processing including treatment of liquids and gases, biological applications of plasmas including plasma medicine and agriculture, surface modification and deposition, powder and nanostructure synthesis, energy applications including plasma combustion and reforming, resource recovery, coupling of plasmas and electrochemistry, and plasma etching. Studies of chemical kinetics in plasmas, and the interactions of plasmas with surfaces are also solicited. It is essential that submissions include substantial consideration of the role of the plasma, for example, the relevant plasma chemistry, plasma physics or plasma–surface interactions; manuscripts that consider solely the properties of materials or substances processed using a plasma are not within the journal’s scope.