| Quantitative Evaluation of Urea-SCR System Hardware Anti-deposition Capability |
| Tiantian Wang1, Gang Chen2,3, Xianju Yuan1, Mahmoud Mabrouk1 |
1Hubei Key Laboratory of Automotive Power Transmission and Electronic Control (Hubei University of Automotive Technology), Shiyan, 442002, Hubei, China
2School of Advanced Manufacturing, Guangdong University of Technology, Guangzhou, 510006, China
3School of Naval Architecture Ocean and Energy Power Engineering, Wuhan University of Technology, Wuhan, 430063, China |
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Received: May 9, 2025; Revised: August 20, 2025 Accepted: August 20, 2025. Published online: January 5, 2026. |
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| ABSTRACT |
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Urea deposition is a common failure mode in diesel Urea Selective Catalytic Reduction (Urea-SCR) systems. The increased urea injection required under low-temperature conditions driven by stricter emission regulations, along with the trend toward close-coupled after-treatment system (ATS) arrangements, has led to a higher risk of urea deposit formation. This study proposes a quantitative method to assess the inherent anti-deposition capability (ADC) of Urea-SCR hardware. Steady-state urea deposit risk tests and simulation analyses of the deposit processes were conducted using the same diesel engine and after-treatment system equipped with different injection and mixing systems. This method facilitates the quantitative evaluation of hardware anti-deposition capability (HADC) and identifies the distinct contributions of injection and mixing systems to deposit formation, thereby providing clear guidance for optimizing ATS hardware selection to enhance HADC. |
| Key Words:
Urea-SCR system · Anti-deposition capability · Deposit risk · Quantitative evaluation · Experimental validation |
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Corresponding Author.
Gang Chen , Email. 
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