Computational Fluid Dynamics Modeling of NOx Reduction Mechanism in Oxy-Fuel Combustion†
Computational Fluid Dynamics Modeling of NOx Reduction Mechanism in Oxy-Fuel Combustion†
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DOI：
10.1021/ef900524b
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发表时间：
2010-01
期刊：
影响因子：
5.3
通讯作者：
Huali Cao;Shaozeng Sun;Yinghui Liu;T. Wall
中科院分区：
文献类型：
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作者：
Huali Cao;Shaozeng Sun;Yinghui Liu;T. Wall
富氧燃烧是一种很有前途的碳捕集技术，它通过将燃料氮转化为NO和还原回收的NO来降低燃煤系统最终排放的NO。在中试规模的试验装置上对澳大利亚亚烟煤的空气和富氧燃烧特性进行了数值研究。在De Soete机理的基础上，利用用户自定义函数（UDF），将燃料NO生成和回收NO还原的附加反应加入到计算流体力学（CFD）程序中。在空气和氧燃料燃烧的NOx预测进行了比较，实验数据。在氧燃料条件下的NO排放量预计将显着低于空气燃烧，即使没有回收NO。挥发分和焦炭之间的氮分配比对NOx排放的影响也进行了研究。
Oxy-fuel combustion is a promising carbon capture technology in which both the conversion of fuel-N to NO and the reduction of recycled NO contribute to lowering of final NO exhausted from the coal combustion system. Combustion characteristics for both air and oxy-fuel conditions were numerically investigated in a pilot scale test facility for an Australian sub-bituminous coal. On the basis of De Soete’s mechanism, the additional reactions for formation of fuel-NO and reduction of recycled NO were added into computational fluid dynamics (CFD) codes, using user-defined functions (UDFs). The NOx predictions in air and oxy-fuel combustion were compared to experimental data. The NO emission in oxy-fuel condition is predicted to be significantly lower than that in air combustion, even without recycled NO. The effect of the nitrogen partitioning ratio between volatile and char on the NOx emission was also investigated.