高碱煤热利用过程中碱金属释放特性的研究进展  

Research progress of alkali metals release characteristics during thermal utilization of high-alkali coals

作　　者：李腾[1] 赵京[1] 魏小林[1] LI Teng;ZHAO Jing;WEI Xiaolin(State Key Laboratory of High-Temperature Gas Kinetics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]中国科学院力学研究所高温气体动力学国家重点实验室,北京100190

出　　处：《华中科技大学学报（自然科学版）》2023年第1期92-100,共9页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金重点资助项目(51736010)。

摘　　要：鉴于高碱煤燃烧过程中碱金属释放机制及影响NO生成的详细机理缺乏系统讨论,在综述前人工作基础上,结合最新的研究成果,通过实验和化学反应计算探讨了碱金属盐的释放特性及其对NO生成的影响机制.结果表明:碱金属的释放速率及释放量会受到反应温度、升温速率、反应气氛及其他矿物元素等因素的影响,并且在释放过程中还伴随着不同赋存形式碱金属之间的相互转化.计算分析发现:释放的NaCl等碱金属盐能够通过影响H,O和OH自由基的重组来影响NO的生成,各种基元反应之间的竞争性关系决定了NaCl对NO最终的影响.The detailed mechanism of alkali metal release and its influence on NO production during high alkali coal combustion was not systematically discussed.Based on the review of previous work and the latest research results of the research group,the release of alkali metals and its influence on the NO formation were discussed in detail through experiments and chemical reaction calculations.The results showed that the release rate and release amount of alkali metals will be affected by the reaction temperature,heating rate,reaction atmosphere and other mineral elements,and the release process is also accompanied by the mutual conversion of different occurrence forms of alkali metal.It is found that the released alkali metal salts such as NaCl can affect the production of NO by influencing the recombination of H,O and OH radicals according to the kinetic calculation.The competitive relationships among various elementary reactions determine the final results.

关 键 词：高碱煤 碱金属 释放特性 NOx 基元反应 竞争关系 

分 类 号：X511[环境科学与工程—环境工程]