[1]王梦华,刘星宇,鲍建军,等.Urea-SCR系统尿素沉积特性及混合器优化[J].内燃机学报,2023,(01):86-95.
　Wang Menghua,Liu Xingyu,Bao Jianjun,et al.Urea Deposition Characteristic in a Urea-SCR System and Optimization of the Mixer[J].,2023,(01):86-95.
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Urea-SCR系统尿素沉积特性及混合器优化
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《内燃机学报》[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2023年01
页码:
86-95
栏目:
出版日期:
2023-01-25

文章信息/Info

Title:
Urea Deposition Characteristic in a Urea-SCR System and Optimization of the Mixer
作者:
王梦华; 刘星宇; 鲍建军; 胡杰
1. 拖拉机动力系统国家重点实验室，河南 洛阳 471039；2. 西安交通大学 能源与动力工程学院， 陕西 西安 710049；3. 武汉理工大学 现代汽车零部件技术湖北省重点实验室，湖北 武汉 430070
Author(s):
Wang Menghua; Liu Xingyu; Bao Jianjun; Hu Jie
1. State Key Laboratory of Power System of Tractor，Luoyang 471039，China；2. School of Energy and Power Engineering，Xi’an Jiaotong University，Xi’an 710049，China；3. Hubei Key Laboratory of Advanced Technology for Automotive Components，Wuhan University of Tec
关键词:
柴油机; 选择性催化还原; 集成式后处理装置; 尿素结晶; 数值仿真; 均匀性
Keywords:
diesel engine; selective catalytic reduction; integrated after-treatment device; urea deposit; numerical simulation; uniformity
分类号:
TK427
文献标志码:
A
摘要:
搭建了快速尿素结晶试验平台，并基于Converge 流体仿真软件耦合12 步尿素详细分解机理搭建了目标柴 油机集成式后处理装置模型，通过试验验证了模型的有效性．对现有混合器结构和喷射压力进行了优化，利用液 膜和尿素分解过程中产生的3 种主要副产物(缩二脲、三聚氰酸和三聚氰酸一酰胺)的分布与质量、选择性催化还 原(SCR)催化器前端截面NH3 的体积分数与质量、混合器背压和各均匀性系数等指标评价了优化前、后混合器的 性能．结果表明：液膜和3 种副产物主要分布在混合器外层套筒的球形底部和内层套筒的内侧，优化方案可以减 少液膜和3 种副产物的累积质量，降低尿素结晶风险；优化方案还可以增加混合区域的湍流强度从而提高SCR 前 端截面NH3的体积分数、质量和均匀性，但其结构会在一定程度上阻碍排气的流动从而使混合器背压稍有提高．
Abstract:
A test platform for rapid urea crystallization was built and an integrated after-treatment device model of the target diesel engine was established based on the Converge fluid simulation software coupled with detailed urea decomposition mechanism. After the effectiveness of the model was verified，the structure and injection pressure of the existing mixer were optimized. The performance of the optimized mixer was evaluated by the distribution and mass of three main by-products of biuret，cyanuric acid and ammelide during the urea decomposition，the concentration and mass of NH3 at the front-end section of selective catalytic reduction(SCR) catalyst，the back pressure and the uniformity coefficients of the mixer. The results show that the film and three by-products are mainly distributed on the spherical shell area of the outer sleeve and the inner side of the inner sleeve，and the optimized mixer decreases the mass of film and by-products. The optimized mixer also increases the turbulence intensity in the mixing area and thereby improves the concentration，mass and uniformity of NH3 at the SCR inlet. But its structure hinders the flow of exhaust，thus slightly increases the back pressure of the mixer.

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更新日期/Last Update: 2023-01-25