Abstract Pleated cartridge filters are widely used to remove dust in industrial processes. However, pulse-jet cleaning is not uniform between filter cartridges. This is due to uneven transient pressure below the injection holes leading to the increase of operating resistance and decline in the cleaning cycle, both of which are detrimental to pleated cartridge filter operation. Therefore, the injection pipe plays an important role in pulse-jet cleaning. In order to provide guidance for injection pipe design, a pulse-jet cleaning experimental system was designed. Experiments involved a constant total filtration area under four working conditions; the effects of the injection hole diameter, the number of injection holes, the jet distance, and the tank pressure on pulse-jet cleaning were studied by testing the static pressure on the inner wall of the cartridge. This also allowed optimization of the jet distance, orifice ratio, injection hole diameter, and internal cartridge volume. The results showed that 1) the transient pressure below the injection holes increased gradually along the airflow direction of the injection pipe, and 2) the peak positive pressures on the corresponding cartridge inner surfaces also increased. Both of these pressure values increased with increasing tank pressure. Peak positive pressure on the inner wall of the cartridges first increased, and then decreased with increasing jet distance. The injection hole diameter and the optimum jet distance can be described by mathematical models developed from this study. The optimum jet distance decreased with increasing injection hole diameter. The optimum orifice ratio range was 0.6–0.8 under the optimum jet distance, adoption of which improved the pulse-jet intensity significantly. Injection hole optimization resulted in gradually decreasing injection hole diameter along the airflow direction of the injection pipe and increased the pulse-jet uniformity by a factor of 5–8. The internal volume of the cartridge influenced pulse jet cleaning under constant filtration area.

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注射管特性对折叠筒式过滤器脉冲喷射清洗均匀性的影响

摘要 褶皱筒式过滤器广泛用于工业过程中的除尘。然而，脉冲喷射清洁在滤芯之间并不均匀。这是由于注入孔下方瞬态压力不均匀导致运行阻力增加和清洗周期下降，这两种情况都不利于折叠滤芯的运行。因此，喷射管在脉冲喷射清洗中起着重要的作用。为为喷射管设计提供指导，设计了脉冲喷射清洗实验系统。实验涉及在四种工作条件下恒定的总过滤面积；喷孔直径、喷孔数量、射流距离的影响，通过测试滤筒内壁的静压，研究了脉冲喷射清洗时的储罐压力。这也允许优化射流距离、孔口比、注射孔直径和内部墨盒体积。结果表明：1）喷射孔下方的瞬态压力沿喷射管的气流方向逐渐增加，2）相应筒内表面的峰值正压也增加。这两个压力值都随着罐压力的增加而增加。随着射流距离的增加，药筒内壁的峰值正压先升高后降低。喷射孔直径和最佳射流距离可以通过本研究开发的数学模型来描述。最佳射流距离随着喷孔直径的增加而减小。在最佳射流距离下，最佳孔口比范围为0.6-0.8，采用该范围可显着提高脉冲射流强度。喷射孔优化导致喷射孔直径沿喷射管的气流方向逐渐减小，脉冲喷射均匀性增加了 5-8 倍。在恒定过滤面积下，滤芯的内部容积影响脉冲喷射清洁。喷射孔优化导致喷射孔直径沿喷射管的气流方向逐渐减小，脉冲喷射均匀性增加了 5-8 倍。在恒定过滤面积下，滤芯的内部容积影响脉冲喷射清洁。喷射孔优化导致喷射孔直径沿喷射管的气流方向逐渐减小，脉冲喷射均匀性增加了 5-8 倍。在恒定过滤面积下，滤芯的内部容积影响脉冲喷射清洁。