用差热分析技术研究煤/煤焦的加压气化动力学

本文建立了一套适合于多种气体使用的高温高压差热分析装置,并用其考察了四种典型的不同煤化程度煤或煤焦,分别将它们在CO_2和水蒸气中进行加压气化.结果表明,试样的气化反应性随煤化程度的加深而降低;气化剂压力对反应性的影响分别为g(p_(co_2))=p_(co_2)/(1+k_(co_2)p_(co_2)和g(p_(H_2O)=p_(H_2O)/(k_(H_2O)+p_(H_2O)).在建立了近似的差热分析数据处理方法的基础上,得到用不同参数值描述不同煤种在不同气体中的加压气化动力学通用方程.与热重分析等传统方法相比,差热分析技术用于煤/煤焦气化动力学的研究不但减少了实验工作量,而且可以得到较准确的结果.

Pressurized Gasification Kinetics of Coal/Char Using Differential Thermal Analyzer Technique

A differential thermal analyzer system able to work at 1500K(maximum) under 3.0 MPa in different gas atmosphere was built up and used to investigate the reaction kinetics of pressurized gasification of four typical coal or coal samples of different ranks by CO2 or steam. The results show that: 1 ) gasification of coal/char increases with the decrease of coal rank; 2 ) the influence of gasification pressure on reactivity can be expressed by for CO2 and for steam. A general model describing the reaction kinetics of pressurized gasification of coal/char by CO2 or steam was obtained as follows Compared with thermogravimetric analysis, this technique yields more accurate results.