堇青石基质混合装置消除选择性催化还原（SCR）加料系统中沉积能力的光学研究

2019/08/19   下载量： 0 次

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应用领域 环保
检测样本 其他
检测项目 其他>其它
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采用LaVision公司的高速阴影成像测试系统和Artium Technologies的 PDI-200相位多普勒粒子干涉仪，对堇青石基质混合装置中的液滴喷射形态和液滴粒径速度进行了测量，并研究了堇青石基质混合装置消除选择性催化还原（SCR）加料系统中沉积的能力。

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    Selective catalytic reduction (SCR) has become the mainstream approach for removing heavy-duty (HD) diesel engine NOx emissions. Highly efficient SCR systems are a key enabling technology allowing engines to be calibrated for very high NOx output with a resultant gain in fuel consumption while still maintaining NOx emissions compliance. One key to the successful implementation of high efficiency SCR at elevated engine out NOx levels is the ability to introduce significantly more AdBlue into the exhaust flow while still ensuring complete ammonia production and avoiding the formation of deposits.
    This paper presents a body of experimental work conducted on an exhaust test bench using optical techniques including high-speed imaging and phase Doppler interferometry (PDI), applied under representative exhaust conditions to a HD diesel engine aftertreatment
system with optical access inside the mixer tube.
    Two different sprays were used to dose AdBlue onto the mixing device. A three-hole injector and a single-hole pressure-swirl injector were characterised in ambient and heated exhaust flow conditions. A metallic two-stage mixer and an uncoated cordierite ceramic substrate mixer were compared and demonstrated the ability of the substrate mixer to reduce deposit formation at higher dosing rates inside the mixer tube when used with the correct spray type. High-speed imaging revealed the ability of the substrate to absorb injected
AdBlue spray at cooler exhaust temperatures. However, using the incorrect spray can lead to liquid saturation inside the substrate channels, which is detrimental due to the formation of deposits on the rear face of the substrate.

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北京欧兰科技发展有限公司
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