Effect of UWS spray angle and positioning of injector on ammonia concentration in Urea-SCR system

S. Sadashiva Prabhu, Kapilan Natesan, Nagaraj Shivappa Nayak

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


Compounds like Urea and Ammonium formate can be used to generate the reducing agent, NH3in De-NOxSelective Catalytic Reduction Systems (SCR). In Urea-SCR, optimized Urea-Water Solution (UWS) injection is a key factor for ammonia (NH3) distribution in SCR mixing chamber. The present simulation study emphasizes the effect of UWS injection strategies and positioning of the injector on NH3conversion efficiency through parametric studies at temperature range of 300-400°C using CFD code AVL FIRE. Simulations were carried out for three spray angles of UWS injection at two different UWS injector positions. For lower spray angles, the NH3concentration was low and it found to increase with an increase in spray angle. The optimized spray angle is necessary in balancing both NH3genartion and wall interaction. The 3D-simulations considering residence time for various spray angles determine the time to achieve maximum NH3concentration in SCR mixing domain. The shifting of injector position leads to variation in urea decomposition and distribution of NH3in the SCR chamber.

Original languageEnglish
Pages (from-to)8051-8055
Number of pages5
JournalMaterials Today: Proceedings
Publication statusPublished - 2021
Event3rd International Conference on Materials, Manufacturing and Modelling, ICMMM 2021 - Vellore, India
Duration: 19-03-202121-03-2021

All Science Journal Classification (ASJC) codes

  • Materials Science(all)


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