摘要
建立了一维滑动弧裂解CO_(2)的反应机理模型.利用对流冷却的特征频率计算横向气流对流引起的等离子体组分损失.将等离子体密度和温度的数值模拟结果与文献中滑动电弧等离子体反应器的实验数据进行了对比,吻合较好.模拟结果表明,滑动弧裂解CO_(2)会产生大量O和O_(2)等活性助燃粒子以及可燃的CO.随着对流冷却特征频率的增加,放电过程中最大电子数密度和电子温度减小,CO_(2)转化率下降.在整个CO_(2)裂解机制中e+CO_(2)→e+CO+O的贡献最大,准稳态中贡献率为90.63%,瞬态中贡献率为98.43%.反应CO+O+M→CO_(2)+M对CO_(2)生成的贡献率最大.在实际应用中,为提高CO_(2)转化率,可以通过增大放电电流,增大e+CO_(2)→e+CO+O的反应速率,同时选择合适的气体流量,避免过大的速度引起CO_(2)转化率下降.
In this paper,a one-dimensional gliding arc model and the detailed mechanism of CO_(2) cracking reaction were established.The characteristic frequency of convection cooling was used to calculate the plasma component loss caused by cross flow convection.The calculated plasma density and plasma temperature were compared with the experimental data of gliding arc plasma reactor in the literature.The calculation results show that a large number of active combustion supporting particles such as O and O_(2) and combustible CO gas will be produced during CO_(2) cracking by gliding arc.With the increase of the characteristic frequency of convection cooling,the maximum electron number density and electron temperature decrease,and the CO_(2) conversion rate decreases.The contribution rate of e+CO_(2)→e+CO+O is the largest in the whole mechanism of CO_(2) cracking,which is 90.63%in quasi steady state and 98.43%in transient state.The contribution rate of CO+O+M→CO_(2)+M to CO_(2) generation is the largest.In practical application,in order to improve the conversion rate of CO_(2),the discharge current and the reaction rate of e+CO_(2)→e+CO+O should be appropriately increased.The gas flow rate should be appropriately selected to avoid the decline of CO_(2) conversion rate caused by excessive speed.
作者
杨锐
游滨川
刘潇
杨家龙
郑洪涛
马彪
YANG Rui;YOU Bin-chuan;LIU Xiao;YANG Jia-long;ZHENG Hong-tao;MA Biao(College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China;Longjiang GH TURBINE Co. Ltd, Harbin 150001, China)
出处
《气体物理》
2022年第1期53-62,共10页
Physics of Gases
基金
黑龙江省博士后资助经费(LBH-Z18049)。
作者简介
第一作者:杨锐(1995-)男,硕士,主要研究方向为等离子体裂解燃料应用,E-mail:1501710726@qq.com;通信作者:刘潇(1988-)男,副教授,研究等离子点火和助燃、燃气轮机低排放燃烧特性,E-mail:liuxiao_heu@163.com。
