Abstract.Stringent emissions regulations require further reducing NOx emissions, selective catalytic reduction (SCR) technology is the mainstream technology to remove NOx at euro V and euro VI stage. First This article introduces the chemical reaction mechanism of Urea-SCR technology that could reduce NOx emissions from diesel engine. Then it points out research actuality of Urea-SCR from the urea storage device, urea supply system, catalystic converter and control unit separately. Finally it analyzed development trend of SCR technology based on research that we have today.
Abstract. Ammonia production technology of urea-SCR system for vehicle is mainly used in pyrolysis. The reaction is complex, and there are some side effects. So a kind of urea hydrolysis device for vehicle is designed. Based on the in-depth analysis of ammonia production technology's mechanism of urea hydrolysis for vehicle, the modified extended UNIQUAC equation and PHS equation of state were used to solve the thermodynamic model, and the experimental verification was carried out on the JX493ZLQ3 diesel engine. The results show that the design of urea hydrolysis reactor is in agreement with the experimental results. In the environment of urea hydrolysis, the higher the hydrolysis temperature, the faster the urea hydrolysis and the faster the production of ammonia. Under the same conditions, the hydrolysis rate of urea was the same, the higher the initial quality, the more ammonia produced. The method is suitable for the ammonia production technology of urea hydrolysis for vehicle and can be used for the formation of urea hydrolysis SCR system.
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