Optimisation design of SCR mixer for improving deposit performance at low temperatures
| Autor: | Chaofeng Zhang, Meiping Wu, Sun Chuan, Kai Lu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Diesel exhaust
business.industry 020209 energy General Chemical Engineering Organic Chemistry Energy Engineering and Power Technology Exhaust gas Selective catalytic reduction 02 engineering and technology Computational fluid dynamics Fuel Technology 020401 chemical engineering 0202 electrical engineering electronic engineering information engineering Environmental science Performance indicator 0204 chemical engineering Process engineering business After treatment |
| Zdroj: | Fuel. 237:465-474 |
| ISSN: | 0016-2361 |
| DOI: | 10.1016/j.fuel.2018.10.025 |
| Popis: | Owing to the increasing stringent regulations on diesel exhaust emissions, the performance requirements of exhaust gas treatment devices are becoming increasingly higher. However, the performance of after treatment systems efficiency at low temperatures still requires improvement. Herein, a new mixer is designed based on the traditional mixer to improve the performance of the engine at low speeds. The performance indicators such as the velocity uniformity, distribution of the uniformity of ammonia, wall-film temperature, and thickness distribution at the downstream pipe are studied. The exhaust backpressure of the traditional mixer and that of the new mixer are first compared based on computational fluid dynamics. Subsequently, the simulation results are verified by the experiments on the crystallisation area of different mixers at low speeds. The results show that the experimental and simulation results are consistent. The new mixer can effectively reduce the risk of crystallisation and improve exhaust emissions while ensuring a higher distribution of reducing agents. It provides an effective reference for the optimisation design of SCR (Selective catalytic reduction) structures. |
| Databáze: | OpenAIRE |
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