Numerical Simulation Analysis And Experimental Research Of Energy Consumption Causing By Dusty Airflow In Bag Filter

With government’s requirement to environmental protection getting stricter and air pollution problem is becaming more and more highlighted, which improve the technical requirement for dedusting. A number of electrostatic dust collectors for coal-fired unitsare are confronted with transforming into bag filter. In addition, fan performance and system reliability improve the technical requirement for bag filter. High operation energy consumption and working life are the main problems which limit promotion of bag filter. The mechanism of bag filter is removal particls by filtration trap with filter materials which is kernel component and effect on filtration resistance and failure. The research of filtration resistance focuses on resistance changing after trapping particles by filter materials, but there is barely researches on operation energy consumption. The formation mechanism of operation energy consumption should be analyzed further more. In this project, we analyzed forming reason from perspective of airflow containing dust and built evaluation methodology which has been applied to structure design and project cases base on the relations with airflow-particles removing-energy consumption. The main works have been done as follows:(1) Established energy loss model of bag filter and analyzed the causes of high-energy loss. The investigation by analysis of movement for particles containing in air-flow found that the increasing concentration of particles in filter bag is major cause of formation of high-energy loss and is main way of effect on energy loss.(2) Build mathematical model of gas flow of bag filter. It can be divided into3areas by analysis of air-flow states in bag filter. We confirmed mathematical model, reasonable boundary layer and simplifications of simulation method by comparative analysis of experimental and simulation result to meet demands of industry.(3) Established evaluation methodology of energy loss by analysis of effect of air distribution on energy loss of bag filter. We determined the evaluation index of direct energy loss of bag filter including calculated resistance, ratio of backmixing and characteristics of filter material structure. The evaluation index of indirect energy loss of bag filter are erosion and treatment load of filter bag.(4) Established evaluation methodology of energy loss by analysis of effect of filter materials on energy loss of bag filter. Build evaluation methodology of filter materials chosen by fitting analysis of experimental results of12filter materials resistance from the point of energy loss. Meanwhile, we analyze of effect of filter material structure on energy loss.(5) Applied evaluation methodology to analyze effect of Structural parameters of equipment on energy loss. Significant factors and influencing rule which effect on energy loss of bag filter were obtained by factor analysis of Structural parameters of equipment.(6) Applied evaluation methodology to predictive analysis of engineering reform projects. We found the problems and differences among the projects by comparing of evaluation index of4reform projects. Finally, we demonstrate the forecasted results of evaluation methodology corresponded to running station of reform projects.