Optimization of particle removal characteristics and efficiency of two-fluid nozzle based on CFD-DEM
Fogging dust removal technology is an important means to effectively prevent and control atmospheric disasters,and is important for dust reduction in cities,mines and other places.Two-fluid atomization nozzles have become a popular research object in the field of atomization and dust removal based on their good atomization performance.In two-fluid atomization nozzle dust removal,the adhesion of the droplets to the soot particles after atomization and the dust reduction process are important steps.Therefore,it is of great theoretical significance to study the adhesion and settling characteristics of fog droplets and soot particles for improving the dust removal efficiency of two-fluid nozzles,and further research is needed.In this paper,the computational fluid dynamics-discrete element method(CFD-DEM)is used to compute the coupling of two-fluid nozzles by using 3D design software and discrete element simulation software ANSYS and EDEM,to study the mutual collision and adhesion between particles and obtains the velocity distribution law of droplet particles under different gas-liquid pressure ratios and different droplet parti-cle sizes,and uses orthogonal numerical simulation method to study the dust reduction efficiency of two-fluid atomi-zation nozzle,and obtains the influence law of each operating parameter on dust reduction efficiency.The results show that the maximum velocity of droplet particles tends to increase with the increase of gas-liquid pressure ratio;the smaller the particle size of droplet particles,the larger the maximum velocity of droplet particles,and the shor-ter the acceleration time to the maximum velocity.The extreme difference analysis shows that the factors affecting the dust reduction efficiency among the operating parameters are droplet particle size B,gas-liquid pressure ratio A,soot particle size D,and soot particle velocity C in descending order,and the optimal level combination is A3B1C3D1.This study can provide some reference for the study of dust reduction characteristics of two-fluid atomi-zing nozzles.
atomized dust removaltwo-fluid nozzleremoval characteristiccomputational fluid dynamics-discrete element method(CFD-DEM)coupling simulation
万方数据
维普
