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Numerical analysis of NOx reduction for compact design in marine urea-SCR system

机译：船用尿素-SCR系统紧凑设计NO x 还原的数值分析

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In order to design a compact urea selective catalytic reduction system, numerical simulation was conducted by computational fluid dynamics tool. A swirl type static mixer and a mixing chamber were considered as mixing units in the system. It had great influence on flow characteristics and urea decomposition into ammonia. The mixer caused flow recirculation and high level of turbulence intensity, and the chamber increased residence time of urea-water-solution injected. Because of those effects, reaction rates of urea decomposition were enhanced in the region. When those mixing units were combined, it showed the maximum because the recirculation zone was significantly developed. NH3 conversion was maximized in the zone due to widely distributed turbulence intensity and high value of uniformity index. It caused improvement of NOx reduction efficiency of the system. It was possible to reduce 55% length of the chamber and connecting pipe without decrease of NOx reduction efficiency.
机译：为了设计紧凑的尿素选择性催化还原系统，利用计算流体力学工具进行了数值模拟。涡流式静态混合器和混合室被认为是系统中的混合单元。它对流动特性和尿素分解成氨的影响很大。混合器引起流动再循环和高水平的湍流强度，并且腔室增加了注入的尿素水溶液的停留时间。由于这些作用，该区域中尿素分解的反应速率提高了。当这些混合单元组合在一起时，它显示出最大值，因为再循环区显着发展了。由于湍流强度分布广泛且均匀度指数较高，因此该区域中的NH3转化最大化。这引起了系统NOx还原效率的提高。可以减少室和连接管的55％的长度而不会降低NO x的还原效率。

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