Abstract The filter cleaning performance of different air injection nozzles installed in a pulse-jet bag filter dust collector were compared. The examined nozzles were a hole nozzle, a nipple nozzle, and a dual-slit injector. The latter is an air injection nozzle with two circumferential slits, which was newly designed in this study to introduce large volumes of cleaning air with a small amount of compressed air, thereby significantly improving the filter cleaning efficiency. When the dual-slit injector was applied under a 2.0 m/min filtration velocity, superior filter cleaning performance and lower dust emission were observed compared to those for the hole and nipple nozzles. In addition, there was little difference in filter cleaning efficiency according to pulsing air pressure, indicating that low and high pulse pressures can yield similar levels of filter cleaning performance when the dual-slit injector is employed; thus, the pulsing energy for filter regeneration can be reduced. Under a 4.0 m/min filtration velocity, neither the hole nor nipple nozzle yielded effective filter cleaning, generating a higher pressure drop and a significantly reduced pulse-jet cleaning interval. On the other hand, the dual-slit injector applied to the pulse-jet bag filter maintained stable filter cleaning performance, even under the high filtration velocity.

中文翻译：

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喷气喷嘴对脉冲喷射袋式除尘器过滤器清洗性能的影响

摘要 比较了脉冲喷射布袋除尘器中安装的不同喷气喷嘴的过滤器清洁性能。检查的喷嘴是孔喷嘴、乳头喷嘴和双缝喷射器。后者是具有两个圆周狭缝的空气喷射喷嘴，这是本研究新设计的，以少量压缩空气引入大量清洁空气，从而显着提高过滤器清洁效率。当在 2.0 m/min 的过滤速度下应用双缝喷射器时，与孔喷嘴和短节喷嘴相比，观察到更好的过滤器清洁性能和更低的粉尘排放。此外，根据脉冲气压，过滤器清洁效率几乎没有差异，表明当采用双缝喷射器时，低脉冲压力和高脉冲压力可以产生相似水平的过滤器清洁性能；因此，可以减少用于过滤器再生的脉冲能量。在 4.0 m/min 的过滤速度下，无论是孔还是喷嘴都不能产生有效的过滤器清洁，从而产生更高的压降和显着缩短的脉冲喷射清洁间隔。另一方面，应用于脉冲喷射袋式过滤器的双缝喷射器即使在高过滤速度下也能保持稳定的过滤器清洁性能。产生更高的压降和显着缩短的脉冲喷射清洁间隔。另一方面，应用于脉冲喷射袋式过滤器的双缝喷射器即使在高过滤速度下也能保持稳定的过滤器清洁性能。产生更高的压降和显着缩短的脉冲喷射清洁间隔。另一方面，应用于脉冲喷射袋式过滤器的双缝喷射器即使在高过滤速度下也能保持稳定的过滤器清洁性能。