Based On The ESP Dust Particles Collection Mechanism Modeling Study

Along with the improvement of national standards for air quality, research on dust collection theory and innovative design of electrostatic precipitator need to be put forward. Improving the collection efficiency and reducing the outlet dust concentration become the focus of the ESP study. Study of dust collection theory needs to be verified by many experiments. There are many problems such as the accurate measurement of experiments, constraint by study equipment and long test cycle, and it is difficult to grasp the overall optimization design. Dust collection simulation can effectively provide the analysis conditions of reality and verification, and simplify the theoretical verification and debugging process, provide important parameters for the design and operation of electrostatic precipitator. The provision of social, economic, environmental benefits widely. Nowadays the combination of collection theory analysis, numerical simulation and experimental verification has become the mainstream of the current research in the field of dust collection.This paper researches on the mathematical modeling of space electric field, dust transport and concentration distribution, accumulation of dust layer and formation of layer charge. The result of numerical simulation analysis the effect factors on the collection efficiency to get the mathematical model of higher precision and wider applicability. There are the main work and innovations as follows:1. Study on the mechanism of dust collection based on electrostatic precipitator, and propose mathematical model of the dust layer and the formation and dissipation of layer charge. Through the analysis of the transport concentration distributing equations for the flow field and electric field, and establish a numerical algorithm simulation of the mathematical model. Using fluid simulation software FLUENT solved the convection velocity and pressure distribution. Using the finite difference numerical solution solved the space electric field and dust transport equation, and analyzed regional boundary conditions. Finally get iterative numerical calculation through the Matlab software in the compete rapping cycle. 2. The impact of dust deposition charge reduces the dust collection efficiency. The dust collecting efficiency of ESP is numerical unsteady in the rapping cycle. The numerical results discussed the influence of deposition charge layer to the space electric field, dust migration, dust layer deposition and charge accumulation rate of weakened in a vibration cycle. Puts forward the rapping time to keep ideal collection efficiency, and provide a reference basis for dust collection.3. Research on the electric field and dust concentration distribution in the electrostatic precipitator. Plate and wire distance ratio has a great influence on the distribution of electric field intensity, the result shows it need to control the ratio within0.5-1to get an uniform electric field. The narrow plate dust collector needs to increase the distance between plates. At the same time analyzed the influence of electrode surface turbulence flow field, and analyzed the relationship between spatial concentration distribution of dust, dust accumulation, charge deposition process and collection efficiency.This paper establishes an accurate mathematical model to describe the process of dust collection, and provides a theoretical calculation model for innovation design of electrostatic precipitator. This paper provides the parameter optimization direction for the working ESP operation, and it will improve overall dust precipitator efficiency to achieve environmental protection and increase social benefits.