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耦合分级燃烧的大容积焦化过程仿真

, PP. 13-20

Keywords: 大容积焦炉,燃烧室,炭化室,分级燃烧,数值仿真

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Abstract:

基于焦炉大容积焦化、分级燃烧加热的过程特点和燃烧室-炭化室耦合的结构特点,建立描述其内部流动、燃烧、传热、传质的三维非稳态数理模型,开展数值仿真,并将模拟结果与实际数据进行对比验证。通过计算,获得到了相应的结焦时间、焦化过程中焦炭床层的温度变化以及废气出口NO含量的变化规律;考察了焦炭床层加热的均匀性,并与传统的下喷式单点燃烧加热焦炉进行对比;最后还分析了装炉煤水分含量、初始温度以及堆密度等操作参数的影响。研究结果表明,对于大容积焦炉,在提高焦炭产量的同时,采用分级燃烧加热方式,可以有效提高焦炭床层的加热均匀性,保证最终产品的质量,并有效减少NO的生成;而且,煤预热、煤调湿和煤料密实技术的应用有利于提高生产效率。该文工作可为焦炉大型化生产实际及设计提供基础理论和参考数据。

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