Applied Research Of Numerical Simulation Method For Gas Flow Distribution Of Straight-through Bag Filter

Air distribution is one of the key technical issues of impact running resistance and the bag design life of large-scale bag filter. Baghouse airflow rational model of research methods are mainly two kinds of experiments and numerical simulation. Numerical simulation method can be precipitator flow field within the whole of the numerical solution, but for the analysis of specific issues precipitator, the simulation results of the expression is not accurate.In this paper, CFD method used straight-through bag filter internal flow field, the windward side of a bag filter unit speed and uniformity of flow distribution as an index to optimize the structure of the dust collector. Research, summarize the results of numerical simulation approach, so that the output airflow organization with a reasonable evaluation of the comparison. Take 30 m~2 of a sintering machine to power the tail bag filter as an example, the adoption rate of the value of the windward side of bag, bags as well as the deviation of flow distribution modules within ESP flow statements and other post-processing methods, a clear air flow, and the guidance of the designer structural optimization of the collector.Finally, the 220MW power plant units of a single straight-through bag filter internal flow field simulation, simulation results of the post-treatment, indicating the existence of unreasonable air distribution, the guide to carry out structural optimization precipitator. The following conclusions:(1) Direct numerical simulation shows that dust collector can be any cross-section of the internal flow velocity distribution, such as the ash bucket wind board layout and structure of the form of bags at the end of the distribution of regional air bag module and the flow distribution downstream of the air bag filter unit, such as the issue of erosion.(2) In the ESP ash bucket with a suitable wind board layout can significantly ease the ash bucket spoiler.(3) Pathline chart can show the air flow in the collector tracks to help the designer to master the local airflow disturbance occurred in the location and angle, to provide a basis for structural adjustment.