摘要
随着温室气体CH_(4)与CO_(2)排放量的逐年增加,全球气温上升、全球变暖加剧。CH_(4)-CO_(2)重整(CRM)能够有效降低温室气体的排放量,且重整产物为合成气(CO和H_(2)),能提高碳资源的利用率。通过CRM装置完成了反应过程及产物分析,结合流体仿真软件Fluent与化工模拟软件Chemkin模拟揭示了等离子体作用下CRM制合成气反应过程中进料速率、进料比(n(CO_(2)):n(CH_(4)))及等离子体功率对反应器内部温度场与浓度场分布的影响规律。结果表明,随着进料速率提高,物流在反应器内涡流作用加剧,导致反应器底部温度变高,CH_(4)所参与副反应的平衡向正方向移动,参与主反应的CH_(4)减少,对CO、H_(2)的选择性降低。相同进料速率下,进料比越大,目标产物产量越高,过量的CO_(2)发生副反应,导致CO的增量大于H_(2)的增量。大功率等离子体提供的高温环境会促进CH_(4)和CO_(2)形成高能量自由基,瞬间发生自由基反应,加快反应进程。本研究可为等离子体活化CRM反应工艺技术的优化提供理论基础和应用指导。
With the annual increase of greenhouse gas CH_(4)and CO_(2)emissions,global temperature rises and global warming intensifies.CH_(4)-CO_(2)reforming(CRM)can effectively reduce greenhouse gas emissions,and the reforming product is synthesis gas(CO and H_(2)),which can improve the utilization rate of carbon resources.The reaction process and product analysis were completed through the CRM device.Combined with the fluid simulation software Fluent and the chemical simulation software Chemkin,the influence of the feed rate,feed ratio(n(CO_(2)):n(CH_(4)))and plasma power on the temperature field and concentration field distribution in the reactor during the reaction process of CRM to synthesis gas under plasma were revealed.The results show that,with the increase of feed rate,the eddy current effect of material flow in the reactor is intensified,which leads to the higher temperature at the bottom of the reactor,the balance of CH_(4)participating in the side reaction moves in the positive direction,the CH_(4)participating in the main reaction decreases,and the selectivity of CO and H_(2)decreases.At the same feed rate,the larger the feed ratio is,the higher the target product output will be,and excessive CO_(2)will cause side reaction,resulting in the increment of CO greater than that of H_(2).The high temperature environment provided by high-power plasma can promote the formation of high energy free radicals from CH_(4)and CO_(2),the free radical reaction can occur instantaneously and accelerate the reaction process.This study will provide theoretical basis and application guidance for the optimization of plasma activated CRM reaction technology.
作者
叶泽甫
朱路奇
孟献梁
李玉赛
YE Zefu;ZHU Luqi;MENG Xianliang;LI Yusai(Shanxi Gemeng US-China Clean Energy R&D Center Co.,Ltd.,Taiyuan 030031,Shanxi,China;School of Chemical Engineering&Technology,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)
出处
《低碳化学与化工》
CAS
北大核心
2023年第2期42-51,共10页
Low-Carbon Chemistry and Chemical Engineering
基金
国家重点研发计划(2019YFE0100100)
山西省科技重大专项资助项目(201811002017)。
