Abstract
In this paper, the internal flow field and external spray characteristics of the spray gun were simulated and analyzed by establishing a coupling model of the gas-liquid two-phase flow of the spray gun. The spray particle size and cone angle under different gas path pressures were mainly studied. The calculation results showed that the spray particle size distribution had a large span, but the overall spray particle size was small. The liquid flow and the air pressure had a little influence on the spray cone angle. The spray SMD was tested by a three-dimensional particle dynamic analyzer (PDA), and the spray cone angle was photographed with a high-speed camera. The test data was basically consistent with the simulation results. The experimental results showed that the model can accurately simulate the internal flow field of the spray gun and the atomization process of urea. It can be used to analyze the characteristics of urea spray and provide a theoretical basis for the optimal design of urea spray gun.
Highlights
With emission regulations increasingly stricter on pollutant emissions, Selective Catalytic Reduction (SCR) has become an important emission reduction technology that meets national V and above emission regulations [1] [2] [3]
The spray SMD was tested by a three-dimensional particle dynamic analyzer (PDA), and the spray cone angle was photographed with a high-speed camera
The experimental results showed that the model can accurately simulate the internal flow field of the spray gun and the atomization process of urea
Summary
With emission regulations increasingly stricter on pollutant emissions, Selective Catalytic Reduction (SCR) has become an important emission reduction technology that meets national V and above emission regulations [1] [2] [3]. A large number of scholars have carried out modeling analysis and experimental research on the mixing uniformity of SCR, pyrolysis hydrolysis of urea, catalyst performance and flow field distribution. N.S. et al used CFD code, Fire v8.3 to study urea spray, theoretically studied the evaporation of individual urea droplets, and used Lagrangian method to track droplet trajectories, and they simulated in different exhaust gas temperatures and injection position, at last the accuracy of the model was verified by experiments [6]. A large number of studies on urea injection and spray have shown that the urea spray characteristics have an important impact on the overall performance of the SCR, but there are relatively few studies on the gas-liquid two-phase flow inside the spray gun. The flow field changes are simulated, and studied the spray characteristics under different gas path pressure. By comparing the simulation results and experimental results, the accuracy of the model is verified, and it could be used as a simulation platform for the performance optimization of the SCR system
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