Numerical Analysis of Urea Decomposition with Static Mixers in Marine SCR System

A numerical simulation for urea decomposition into ammonia with static mixers was performed for marine selective catalytic reduction.Three types of mixer were considered to improve urea into ammonia conversion rate.The effect of each mixer such as pressure drop, particle residence time, and uniform distribution of urea water solution was investigated using three dimensional CFD code.Using mixer regardless of a type was improved urea decomposition.Engine performance could be affected by high pressure drop caused by mixer.Therefore, the proper mixer should be chosen in permissible level of pressure drop as well as ammonia conversion rate.