基于Aspen Plus的煤焦油化学链热解反应模拟研究

摘要

为了得到煤焦油化学链热解生产炭黑的最优工况,本文利用流程模拟软件Aspen Plus对该过程进行模拟,并对化学反应动力学进行分析.选择Fe2O3作为载氧体,根据已知的动力学参数,利用Aspen Plus中的全混釜反应器模块进行模拟,主要研究了反应温度、反应时间以及煤焦油与载氧体进料比值对炭黑产率及反应能量转换效率的影响.分析表明,随着温度的升高,炭黑产率呈先上升后下降的趋势,在900℃左右达到最大值;该反应温度下,当反应时间为2 s,载氧体与煤焦油进料摩尔比为2.5∶1时,炭黑产率最大;此时煤焦油反应率为95％以上.该研究对煤焦油化学链热解反应实验具有参考价值.%In order to obtain the optimal conditions for the production of carbon black by pyrolysis of coal tar,this process is simulated by flow simulation software Aspen Plus,and the chemical reaction kinetics is analyzed.In this paper,Fe2O3 was selected as the oxygen carrier and simulated according to the known kinetic parameters using the RCSTR reactor in Aspen Plus.The effects of reaction temperature,reaction time and the ratio of oxygen carrier to coal tar on black carbon yield and reaction energy conversion efficiency were studied.The results show that the yield of carbon black increases first and then decreases with the increase of temperature,and reaches the maximum at about 900 ℃.At this reaction temperature,when the reaction time is 2 s,and the molar ratio of carrier oxygen to coal tar is 2.5 ∶ 1,the yield of carbon black is largest;coal tar reaction rate is more than 95 ％.The results of the study have reference value for the experiment of chemical looping pyrolysis of coal tar.