Optimization of compact SCR Urea mixer to decompose the urea in Linear designed After treatment system for high power Dual Exhaust Diesel Engines

This study focuses on the optimization of a compact Selective Catalytic Reduction (SCR) urea mixer designed to efficiently decompose urea within a linear after-treatment system for high-power dual exhaust diesel engines. The primary objective is to enhance the performance of the SCR system by ensuring thorough mixing and complete decomposition of urea into ammonia (NH₃), which is essential for effective NOₓ reduction. A comprehensive parametric study was conducted using computational fluid dynamics (CFD) simulations to evaluate various mixer geometries, urea injection strategies, and airflow patterns. The research focused on identifying designs that promote optimal mixing efficiency and minimize pressure drop with compact design. Key performance indicators such as pressure drop, mixing quality, and ammonia uniformity were assessed to determine the optimal mixer configuration. The study also examined the impact of the decomposition pipe length on the residence time of urea, ensuring complete decomposition before reaching the catalyst to avoid ammonia slip and maximize NOₓ conversion. The optimized mixer design demonstrated significant improvements in mixing efficiency and pressure drop reduction, contributing to the development of more efficient and environmentally friendly high-power diesel engines. This study highlights the importance of decomposition of urea chamber in linear designed Aftertreatment system, providing valuable insights for future developments in SCR technology for off-road high-power diesel engines