Urea Conversion for Low-Temperature Selective Catalytic Reduction in a Swirled Diesel Exhaust Gas Configuration,Chemical Engineering & Technology

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Urea Conversion for Low-Temperature Selective Catalytic Reduction in a Swirled Diesel Exhaust Gas Configuration
Chemical Engineering & Technology ( IF 1.8 ) Pub Date : 2022-01-20 , DOI: 10.1002/ceat.202100571
Sandro Gierth ₁ , Sandra Hartl ₁ , Martin Pollack ₁ , Christian Hasse ₁ , Uwe Hofmann ₂ , Gennadi Zikoridse ₂ , Helge Rautenberg ₃ , Frank Will ₃ , Christoph Hahn ₄ , Sven Kureti ₄

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A novel design of an AdBlue mixing unit to reduce urea deposits at low temperatures in diesel exhaust is described. The main principle of the mixer includes the injection of AdBlue in an axisymmetric swirling flow, which is achieved by splitting the exhaust stream and off-centred introduction of the sub-flows. Crucial geometric parameters were analyzed by computational fluid dynamics (CFD) simulations towards pressure loss, flow field, and spray morphology. Deposit formation was experimentally investigated on three upscaling levels implying an optical test bench, a diesel engine test bench, and a hydraulic excavator. In particular, the studies with the hydraulic excavator showed neither deposits nor critical back pressure. Overall, the experiments substantiated the working principle of the AdBlue mixer.

中文翻译：

用于涡流柴油废气配置中低温选择性催化还原的尿素转化

描述了一种新型 AdBlue 混合装置设计，用于减少柴油机尾气中低温下的尿素沉积物。混合器的主要原理包括以轴对称涡流喷射 AdBlue，这是通过分离排气流和偏心引入子流来实现的。关键几何参数通过计算流体动力学 (CFD) 模拟对压力损失、流场和喷雾形态进行了分析。沉积物形成在三个升级级别上进行了实验研究，这意味着光学测试台、柴油发动机测试台和液压挖掘机。特别是，对液压挖掘机的研究既没有显示沉积物，也没有显示临界背压。总体而言，实验证实了 AdBlue 混合器的工作原理。

更新日期：2022-01-20

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