Numerical Simulation And Experiment Of Cyclone Internal Flow Field

Dust collector cyclone is the equipment by means of the rotational motion of gas-solid two phase flow. It can separate solid particles from the air flow under the centrifugal force.Because of its simple structure, no relative motion of parts inside, easy to manufacturing, low cost , low operating cost, easy to operate and maintain, and satisfy special requirements under different production conditions, it is widely used in chemical industry, energy, mining , oil refining, food, building materials, environmental protection and many other industries since produced, and now become the most commonly used equipment in separation and dust-cleaning.At this moment, increasingly serious energy crisis and environmental issues make the dust collector develop to the direction of highly efficient filter to the low resistance. But the performance of various forms of dust collector cyclone which have extensive use in the actual operation process is still far away to the requirements, especially the application area in dealing with low dust content and small particle size. Based on two phase flow basic theory, this paper do a deep study and analysis on the internal flow field. It ensures the numerical simulation methods for dust collector cyclone by FLUENT software, including the choice of theoretical models, computational domain grid division, and the choice of calculation method and so on. In this paper, the author does a numerical simulation on typical Stairmand dust collector cyclone for analyzing 3-direction velocity distributing, pressure field distributing and structural characteristics of turbulent flow field. Then, based on the study of gas flow field, it simulates the particle trajectories, and ensures the ability to trap particles of different sizes of the cyclone by the particle trajectories. The results show that the trapping capacity of Stairmand cyclone dust collector on less than 10mm particle is less desirable. Therefore, this paper advances a new structure of cyclone dust collector in order to meet the practical needs of industry. The flow field and performance of improved model are compared with previous model by simulation. At the same time, conduct a relevant experiment in the laboratory. The improved program is feasible.The results indicate that the efficiency of dust collection raise up to 3.28% and pressure loss maximum reduction of 40% or more after amelioration of dust collector cyclone. The results of paper have great significance for understanding the separation mechanism and the internal complex flow field of dust collector cyclone, enhancing efficiency of dust collection and improving and optimizing the structure.