关于H-C-O体系析碳状态分布图的开发与应用  

Development and application of carbon deposition state diagram for H-C-O system

作　　者：沈峰满 丁智敏 王硕 张严 郑海燕 SHEN Fengman;DING Zhimin;WANG Shuo;ZHANG Yan;ZHENG Haiyan(School of Metallurgy,Northeastern University,Shengyang 110819,Liaoning,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819

出　　处：《钢铁》2024年第9期122-129,共8页Iron and Steel

基　　金：国家自然科学基金资助项目(52274322,51974073)。

摘　　要：针对冶金领域的富氢直接还原气体制备、竖炉直接还原过程、高炉煤气循环利用以及化工领域的天然气制氢等涉及CH_(4)-H_(2)-CO-H_(2)O-CO_(2)体系尤其是更具广泛代表性的H-C-O体系的析碳共性问题,建立一种便捷、快速、易操作、普适性强地判断体系是否析碳的方法十分必要。在“H-C-O体系质量与化学平衡衡算图”基础上,基于多相、多反应共存体系的平衡原理,确定了包括体系温度、总压、体系内n_(H_(2))/n_(CO)比值等各种操作条件下对应的临界析碳点坐标(nO/nC,nH/nC),连接相同参数的临界析碳点得到对应的临界析碳曲线,构建了“H-C-O体系析碳状态分布图”,开发了一种可准确把握生产状态、确定体系是否发生析碳的新方法,建立了H-C-O体系析碳状态分布理论,为选择控制析碳工艺参数提供了理论基础;为了解决制作“H-C-O体系析碳状态分布图”时存在计算较繁杂的不足,开发了“H-C-O体系析碳状态分布图”分析专用软件,并结合已知的生产实践以及文献数据,验证了“H-C-O体系析碳状态分布图”的合理性和实用性。研究表明,论文提出的确定体系是否发生析碳的新方法普适性广、包容性强,“H-C-O体系析碳状态分布图”不仅能简捷、快速、准确地判别某给定条件下体系是否会发生析碳问题,而且可以给出既能防止体系析碳又能最大限度降低天然气制氢工序能耗和成本的努力方向,为实际生产降本、降耗、稳定、顺行提供有效的指导。With regard to carbon deposition problems of hydrogen-rich direct reduction gas preparation,direct reduction process of shaft furnace,blast furnace gas recycling in the metallurgical field,and hydrogen production from natural gas in the chemical industry,it is necessary to establish a convenient,fast,easy to operate,and universally applicable method to determine whether carbon deposition has occurred in CH_(4)-H_(2)-CO-H_(2)O-CO_(2) system,especially the more widely representative H-C-O system.Based on the"mass balance and chemical equilibrium diagram of HC-O system"and the equilibrium principle of multi-phase and multi-reaction coexistence system,the critical carbon deposition point coordinates(nO/nC,nH/nC)corresponding to various operating conditions such as system temperature,total pressure,and n_(H_(2))/n_(CO) ratio in the system were determined,and the corresponding critical carbon deposition curves were obtained by connecting the critical carbon deposition points with the same parameters,a"carbon deposition state diagram for H-C-O system"was constructed.A new method was developed to accurately determine the production state and whether carbon deposition occurs in the system,and the H-C-O system carbon deposition state theory was established which provides a theoretical basis for selecting and controlling carbon evolution process parameters.In order to solve the problem of complicated calculation in the preparation of the"carbon deposition state diagram for H-C-O system",a specialized software for analyzing carbon deposition states in the H-C-O system was developed and the rationality and practicality of the"carbon deposition state diagram for H-C-O system"were verified by using data from production practice and literature.Based on the above investigation,the results show that the new method proposed in the paper for determining whether carbon deposition has occurred in the system is widely applicable and highly inclusive and"carbon deposition state diagram for H-C-O system"can not only simply,quickly,and ac

关 键 词：H-C-O体系质量与化学平衡衡算图 临界析碳曲线 H-C-O体系析碳状态分布图 析碳控制 分析专用软件 

分 类 号：TF55[冶金工程—钢铁冶金]