Abstract
Abstract The kinetic mechanism of chemical reaction was used to calculate the coupling of the fluid kinetics with the urea decomposition reaction and the SCR reaction kinetics. Combined with the engine test and simulation, the distribution uniformity of the urea injection and ammonia gas was studied. Through numerical simulation on urea spray and exhaust flow in Urea-SCR system, the flow field characteristics in whole after-treatment system are gotten. By using numerical calculation in different urea injection angle and orifice sizes, the urea-crystallization and ammonia distribution have been studied and the optimal urea spray angle and nozzle size are given.
Highlights
With the improvement of national emission regulations, the control of NOX emission is becoming more and more stringent, and the after-treatment technology of diesel engine is facing new challenges [1, 2]
We find that the sauter diameter of the urea particle is larger when the nozzle is enlarged
The following conclusions are drawn: (1) The study was done about the variable parameters of urea injection
Summary
With the improvement of national emission regulations, the control of NOX emission is becoming more and more stringent, and the after-treatment technology of diesel engine is facing new challenges [1, 2]. Selective Catalytic Reduction (SCR) catalyst is one of the most promising technologies for controlling NOx emissions by using ammonia as an active intermediate for NOx reduction [3]. Based on the national condition, Urea-SCR technology will be the main technical direction of diesel engine emission in the future, because of its high efficiency, high selectivity, high economy and sulfur tolerance [4].
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