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污染控制技术及原理

Thermogravimetric studies on the heterogeneous reaction kinetics of petroleum coke char with nitrous oxide under temperature range of fluidized bed

摘要：采用升温热重方法研究了流化床温度条件下N₂O与石油焦焦炭的多相反应动力学特性,实验中设置升温范围为973～1273K,升温速率为5K·min^-1.估算及灰色关联分析的结果表明,在流化床工况下,N₂O与石油焦焦炭间的多相反应由内扩散过程控制,尤其是气体在石油焦焦炭中孔中的扩散对于多相反应的进行具有重要作用.同时,采用Coats-Redfern法对升温热重数据进行了分析,得到了4种不同石油焦焦炭(JMchar、ZHchar、WHchar和GHchar)的动力学机理及动力学参数,JMchar、ZHchar、WHchar和GHchar的活化能分别为128.9、113.8、154·1和127.3kJ·mol^-1.

Abstract：The global kinetics of the heterogeneous reaction between N₂O and petroleum coke char in the combustion temperature range of fluidized bed were studied using a programmed-temperature thermogravimetric system. The temperature range was from 973Kto 1273K, and the heating rate was 5K·min^-1. The results of estimation and grey relation analysis indicated that the heterogeneous reaction of N₂O with petroleum coke char was governed by the internal diffusion in the pore of petroleum coke char, especially in meso- pore in metioned temperature range. The kinetic mechanism and kinetic parameters of four types of petroleum coke chars were determined using Coats-Redfern method. The heterogeneous reaction mechanism of GHchar、ZHchar and WHchar can be described by -ln(1-X), and the reaction mechanism function of JMchar is [ln(1-X)]^1/2. The activation energy of JMchar、ZHchar、WHchar and GHchar are 128.9、113.8、154.1 and 127.3 kJ·mol^-1, respectively.