The Numerical Simulation And Research On Pneumatic Mixing Process Of Cement Powder

In the process of cement production, the mixing is a very important operation, the effect of its mixing directly impact on the quality of the cement. Currently, in the process of cement production, the methods of mixing usually are mechanical means, especially in the mixing for the cement clinker and various additives. However, due to the methods of mechanical mixing can not meet the needs of a large number of cement production, and it has great energy consumption. Therefore, the way of pneumatic mixing could meet the needs of a large number of cement production, and also to be an important way of conserving resources.The flow is very complex in pneumatic homogenization storage, there are many factors to impact on the quality of the particles mixing. The simulation technology based on computational fluid dynamics can accurately predict and analyze the flow of fluid, multiple phase flow and so on. Some results are testified and applied in different kinds of industry field. With the rapid development of the simulation technology and applications in industrial field, it is also a good method to describe the process of pneumatic mixing and optimal design for the structure snd technology parameter.The article have analyzed the technology process of cement synthesis, and introduced the structure of the equipment and working principle in the process of cement mixing, discussed the mixing process and principle of fluidized particles. The results show that fluidization velocity is the key factor to impact flow state. On this basis, as the cement clinker for sample, have analyzed and calculated it's critical fluidization velocity, simulated the process of two-dimensional fluidized flow using Euler-Euler model, and obtained some useful information in different operation condition, such as fluidization height, flow state, volume fraction(concentration) of particles and the static pressure; Base on analysing the liquidity of cement powder and effect factor of mixing quality, have simulated the process of mixing for two powder particles with different properties, and analyzed different factors for mixing effect, include powder particle size, density, ratio of hight and diameter of equipment, accumulation height of powder particles and different aerated manners.The result of numerical simulation predicts the movement of the gas and particle phase, it provides useful informations for analyzing the mixing theory and evenness degree, and also provides important theoretical basis for technology parameter and optimization of structure.