基于燃料选择性分布的铁矿烧结NOx减排研究

项目名称： 基于燃料选择性分布的铁矿烧结NOx减排研究

项目编号： No.51304245

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 矿业工程

项目作者： 甘敏

作者单位： 中南大学

项目金额： 25万元

中文摘要： 铁矿烧结是钢铁工业NOx排放的主要发生源。本项目提出抑制生成和催化降解协同控制烧结NOx排放的思想。其关键是构建燃料选择性分布在内层的双层结构制粒小球，使内层燃料低空气过剩系数燃烧而抑制NOx的生成，并利用燃烧产生的还原气体实现NOx的降解，同时使内层不完全燃烧生成的CO在小球外层充分二次燃烧。项目综合应用高温冶金学、燃烧学等原理，结合铁矿制粒技术，通过研究燃烧气氛对NOx产生的影响，以及NOx在还原气体和烧结混合料催化作用下的降解行为，揭示烧结过程抑制NOx产生及催化NOx降解的机理，建立协同控制NOx排放的烧结理论；通过研究小球内层燃料构成、小球化学成分分布和结构参数等对制粒小球径向气体组成及烧结成矿的影响，构建合理的双层结构制粒小球，开发烧结NOx高效减排的关键技术，为钢铁工业的绿色健康发展作出贡献。

中文关键词： 铁矿烧结；NOx排放；燃料分布；燃烧控制；清洁生产

英文摘要： Iron ore sintering is the main source of NOx emission in iron&steel industry. The idea of controlling NOx emission by combination of suppressing generation and catalytic degradation is proposed in this project, which is expected to be achieved by building granulation balls of double-layer with fuels selectively distributed in the inner layer. Fuels distributed inside can combust under low excess air coefficient, which not only facilitates suppressing generation of NOx, but helps to degrade NOx by reducing gases produced during combusting process. Meanwhile, CO generated form incomplete combustion in the inner layer can get secondary complete combustion with O2 in the outer layer. By researching the influences of combustion atmosphere on NOx formation and its degradation behaviors with reducing gases and mixtures as catalysts, the mechanism of NOx's generation inhibition and catalytic degradation during sintering is revealed, the theory of cooperative control of NOx emissions is established, as well with integrated application of pyrometallurgy, combustion theory, iron ore pelletizing technology etc.. By studying the influences of fuel constitution of inner layer, chemical composition distribution, granule structural parameters, etc. of granulation balls on its radial gas composition and sintering mineralization,

英文关键词： Iron ore sintering；NOx emission；Fuel distribution；Combustion controlling；Cleaner production