Research On Key Technologies Of Pulse Jet Bag Filter

With the rapid development of China’s economy,the air quality problem has become increasingly serious.In particular,the impact of haze caused by coal combustion on people’s daily life and physical health has led to increasing attention on air purification equipment and waste removal equipment.The dust removal efficiency of bag filter makes it widely used.Therefore,this paper mainly studies the key technologies of pulse jet bag filter.The main research contents mainly include the numerical simulation of the internal flow field of the pulse jet bag filter,the design and optimization of the grooved baffle structure,and the pulse injection.Research on numerical simulation of cleaning process and evaluation of pulse jet cleaning effect.Air flow distribution is one of the key factors affecting the overall performance of the dust removal equipment and equipment safety.Through the FLUENT software for fluid analysis and multi-field internal simulation,the standard double equation model and SIMPLE algorithm are used to obtain the interior of the dust collector according to the calculation results.The distribution law of flow field can better understand the air flow inside the dust collector and facilitate the structure improvement and optimization in the next step.The air intake deflector is an important diverter and diversion part of the bag filter.The workbench and FLUENT software are used to calculate and analyze the structure,stress intensity and flow field distribution of the pulse jet bag filter deflector.Aiming at the problem of inlet airflow distribution caused by the existing structural defects of the current deflector,a new structural improvement scheme was proposed.Multi-objective integration optimization of multiple design variables was performed by the multi-disciplinary optimization software Isight,and deflection of the deflector was obtained.The relationship between the angle of the angle,the radius of the transition arc,and the length of the bend,and the pressure on the deflector and the filter wind speed.The full-response model and the neighborhood genetic algorithm were used to obtain the optimal design of the deflector.The pressure of the optimized deflector and the maximum flow velocity at the inlet of the precipitator are greatly reduced,which improves the working efficiency of the precipitator.The pulse injection process is related to the long-term efficient and economic operation of the dust collector.The rationality of its design is positively related to the life of the dust collector.The numerical simulation of the pulse jet cleaning process takes a single filter bag as the research object,and the FLUENT is used to treat the bag.The pulse jet cleaning process of the dust collector was simulated by numerical simulation.The distribution rule of flow velocity and pressure inside the filter bag at various times was obtained.The experiment was designed and the experimental data were collected.The comparison results of the two were more consistent and verified the calculation results.Correctness.The multi-disciplinary optimization software Isight is used to build the DOE model.The correlation coefficient of each input parameter to the target variable is obtained through the experimental design study.The maximum reverse acceleration of the filter bag and the length and the injection time of the filter bag are obtained by studying the mechanism of the cleaning mechanism.The functional relationship shows that the ratio of the peak pressure of the filter bag side wall peak pressure to the maximum reverse acceleration can better evaluate the cleaning effect,and the filter bag receives a larger reverse acceleration and is subjected to a smaller side wall pressure,ensuring good cleaning.The effect increases the life of the filter bag.