SCR系统高效混合器的研究

IF 1.2 4区工程技术 Q3 ENGINEERING, MECHANICAL

Mechanics & Industry Pub Date : 2021-01-01 DOI:10.1051/MECA/2020101

K. Lu, Dewen Liu, Yan Wu, Shusen Liu, Shuzhan Bai

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引用次数: 7

摘要

为满足国六排放标准的要求，研制了一种新型柴油机后处理混合器。至于混合器的结构，采用螺旋叶片环绕，中心错开小叶片，有利于粉碎尿素液滴，并能使液滴与空气充分混合，提高氮氧化物(NOx)的转化效率，减少氨泄漏。对配备新型混合器的后处理系统进行了数值分析、发动机台架试验和车辆道路试验。数值计算结果表明，选择性催化还原(SCR)载体的速度均匀性指数可达0.98，氨均匀性可达0.95，同时低壁膜高度表现出优异的抗结晶性能。发动机台架试验结果与数值结果吻合较好。车辆耐久性试验后的混合器结晶状态可接受，性能良好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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A study on the high-efficiency mixer of the SCR system

A new mixer for a diesel engine after-treatment system is developed to meet the requirements of China VI emission regulation. As for the structure of the mixer, it is surrounded by spiral blades, and the center is staggered with small blades, which is conducive to the crushing of urea droplets and can make the droplets fully mixed with air, improve the conversion efficiency of nitrogen oxides (NOx) and reduce ammonia leakage. The numerical analysis, engine bench test, and vehicle road test were carried out on the after-treatment system equipped with the new mixer. The numerical calculation results show that the velocity uniformity index of the selective catalytic reduction (SCR) carrier can reach 0.98, as well as the ammonia uniformity can reach 0.95, meanwhile, the low wall film height shows excellent anti-crystallization properties. engine bench test results are consistent with numerical results. The crystallization status of the mixer after the vehicle durability test is acceptable and well performed.

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来源期刊

Mechanics & Industry ENGINEERING, MECHANICAL-MECHANICS

CiteScore

2.80

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： An International Journal on Mechanical Sciences and Engineering Applications With papers from industry, Research and Development departments and academic institutions, this journal acts as an interface between research and industry, coordinating and disseminating scientific and technical mechanical research in relation to industrial activities. Targeted readers are technicians, engineers, executives, researchers, and teachers who are working in industrial companies as managers or in Research and Development departments, technical centres, laboratories, universities, technical and engineering schools. The journal is an AFM (Association Française de Mécanique) publication.