The purpose of this study is to improve the operation of a pulse-jet baghouse by the modification of the design of its compressed air injection pipe. The base injection pipe has all the nozzles of constant diameter (9.7 mm). To characterise the injection pipe, experimental measurements and three dimensional CFD simulations were carried out. The impact of the geometry of the injection pipe on the behaviour of an instrumented filter bag moved under the nozzles has been assessed from experimental measurements. Once the design of a new injection pipe has been defined by three dimensional CFD simulation and assessed by measurements, the performances of a semi-industrial pulse-jet baghouse has been measured with both the base and the modified injection pipes. The main conclusion of our study is that in order to ensure that cleaning of filter bags belonging to the same injection pipe is more homogeneous, it is not enough to assess the injection pipe (by measurements and/or calculation) but it is also necessary to characterize the behaviour of a filter bag moved under and along the nozzles of the injection pipe. The results of our study show that a new injection pipe geometry with decreasing nozzle diameter (from 10.5 mm at the inlet to 8.0 mm at the bottom of the pipe) allows a more uniform behaviour of the instrumented filter bag moved under and along the pipe. This better uniformity is characterized by both the average peak pressure and the average root mean square acceleration averaged along the height of the filter bag. Finally, when operated with the modified injection pipes, the semi-industrial pulse-jet baghouse shows better performances characterized by lower residual pressure drop after cleaning (−8 %), longer filtration cycles (+70 %) and lower particle emissions (−5 % for PM₁, −15 % for PM_2.5 and −18 % for PM₁₀).

本研究的目的是通过修改其压缩空气喷射管的设计来改进脉冲喷射袋式除尘器的运行。基础喷射管具有所有恒定直径（9.7 毫米）的喷嘴。为了表征注入管，进行了实验测量和三维 CFD 模拟。注射管的几何形状对在喷嘴下方移动的仪表化过滤袋的行为的影响已通过实验测量进行了评估。一旦通过三维 CFD 模拟定义了新注入管的设计并通过测量进行了评估，就使用基础和改进的注入管测量了半工业脉冲喷射布袋除尘器的性能。我们研究的主要结论是，为了确保属于同一注入管的过滤袋的清洁更均匀，仅评估注入管（通过测量和/或计算）是不够的，但还需要表征过滤袋在注射管喷嘴下方和沿喷嘴移动的行为。我们的研究结果表明，随着喷嘴直径的减小（从入口处的 10.5 毫米到管道底部的 8.0 毫米），新的喷射管几何形状允许在管道下方和沿管道移动的仪表化过滤袋的行为更加均匀。这种更好的均匀性的特点是平均峰值压力和平均均方根 仅评估注入管（通过测量和/或计算）是不够的，还需要表征过滤袋在注入管的喷嘴下方和沿其喷嘴移动的行为。我们的研究结果表明，随着喷嘴直径的减小（从入口处的 10.5 毫米到管道底部的 8.0 毫米），新的喷射管几何形状允许仪表化过滤袋在管道下方和沿管道移动时的行为更加均匀。这种更好的均匀性的特点是平均峰值压力和平均均方根 仅评估注入管（通过测量和/或计算）是不够的，还需要表征过滤袋在注入管的喷嘴下方和沿其喷嘴移动的行为。我们的研究结果表明，随着喷嘴直径的减小（从入口处的 10.5 毫米到管道底部的 8.0 毫米），新的喷射管几何形状允许仪表化过滤袋在管道下方和沿管道移动时的行为更加均匀。这种更好的均匀性的特点是平均峰值压力和平均均方根 0 mm 在管道底部）允许仪表化过滤袋在管道下方和沿管道移动的行为更加一致。这种更好的均匀性的特点是平均峰值压力和平均均方根 0 mm 在管道底部）允许仪表化过滤袋在管道下方和沿管道移动的行为更加一致。这种更好的均匀性的特点是平均峰值压力和平均均方根沿滤袋高度的平均加速度。最后，当与改进的喷射管一起运行时，半工业脉冲喷射袋式除尘器表现出更好的性能，其特点是清洁后残余压降更低 (-8 %)、过滤周期更长 (+70 %) 和颗粒排放更低 (-5 PM _{1的百分比，PM 2.5}的 -15 %_{和 PM 10}的 -18 %）。