变恢复系数下纤维过滤捕集效率的数值模拟热能工程专业论文.docxVIP

Numerical Numerical Simulation on Fiber Collection Efficiency with Variable Coef丘cient of Restitution Abstract With the speeding up of the industrialization and the increase of energy demand，the emission problem of fine particulate matter has been received more and more attention．Bag type dust collector is the most widely used equipment of dust collector．By using fiber-filtering technology，it Call efficiently filter the micro-sized particles in airflow．But as the increasing of the fine particulate roarer emission regulation，improving the existing fiber technology has become the top priority． In this paper,based on the mechanism of particle collision，considering the effect of variable restitution coefficient to the particle deposition and fiber capture coefficient，a particle deposition model and a deposited particle tree structure iS established．Then the process of the particle deposited on the single／multi fiber structure is simulated to make references to the design and improvement of the bag type dust filter． First，from the aspects of the particle size and the filtration velocity，the effects on the particle deposition and collection efficiency are discussed．The result shows that in the aspect of particle deposition，when the filtering speed is relatively small，particle will evenly deposit around the fiber．With the increase of the filtering speed，particle deposition area gradually focuses on fiber windward side．When the filtering exceeding the critical capture speed， particles collision’IⅣim the center of the fiber windward begins to rebound，and the deposited particles on this area started to decrease．When the filtering speed is constant，埘m the increasing particle diameter，the effect of the inertia becomes lager．Particle deposition area goes to the two flanks of the windward side，and the stack height as well as the layer number of the deposited particle rise rapidly．On the aspects of the collection efficiency，when the filtering speed makes the St number equal to 1