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| Effects of Porous Pipe Structure on Flow Field and Catalytic Characteristics of a Diesel SCR System |
| DOI： |
| Key Words:diesel engine simulation selective catalytic reduction(SCR) porous tubes uniformity conversion rate NOx |
| Author Name | Affiliation | | CHENG Dongkang,ZHENG Qingping,JIAO Yunjing,JIA Xinying,LIU Jiaxin | 1.School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China；
2.North China Institute of Aerospace Engineering, Langfang 065000, China；
3.Tianjin Lovol Engine Co., Ltd., Tianjin 300402, China |
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| Abstract:A CFD numerical calculation model was established to simulate the flow and purifying effect of a diesel urea selective catalytic reduction (SCR) system with different porous tubes at the front end of the catalytic converter. Effects of different porous pipe structures on pressure distribution and loss, flow field distribution, ammonia uniformity and NOx conversion rate were analyzed under the conditions of A25 and rated load respectively. Results show that the influence of the addition of porous tubes and different porous tube structures on the flow field and catalytic characteristics of the SCR system is different, in which the porous tube Ⅱ has the most obvious influence on the flow field distribution and pressure loss, ammonia uniformity and NOx conversion rate, resulting in a pressure loss of 1.2 kPa and NOx conversion rate increase of about 8% .The numerical error between the test result and the simulation calculation is in a reasonable range, which verifies the accuracy of the simulation calculation and the rationality of the structure design. |
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