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An experimental study on the removal of submicron fly ash and black carbon in a gravitational wet scrubber with electrostatic enhancement

机译：用静电增强去除引力湿式洗涤器中亚微米粉煤灰和黑碳的实验研究

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摘要

It is of great significance to adopt a cost-effective and highly efficient method to capture submicron particles produced by small-scale industrial boilers. In this study, a middle-scale wet electrostatic scrubbing (WES) setup was built to investigate its performance in the removal of both fly ash particles and black carbon, with special attention to the submicron size range. Major factors including the particle properties and charging conditions were expatiated in detail to popularize this method. The results showed that the efficiency increase in black carbon is significantly higher than that of fly ash particles at the charging condition. For the case of droplet charging, the highest efficiency increase in black carbon in the submicron size range is up to 60%, while that of fly ash is only 40% under same conditions. In comparison with particle charging, droplet charging plays a more significant role in removing both fly ash particles and black carbon, which is beneficial for reforming conventional wet scrubbers. Moreover, more small particles could adhere to the surface of large fly ash particles after scavenging while this phenomenon was not found for black carbon due to the characteristic of fractal agglomerates.
机译：采用具有成本效益和高效的方法来捕获小型工业锅炉生产的亚微米粒子是具有重要意义。在这项研究中，建立了一种中间湿静电擦洗（WES）设置，以研究其在去除粉煤灰颗粒和黑碳中的性能，特别注意亚微米尺寸范围。详细阐述了包括颗粒性能和充电条件的主要因素以推广该方法。结果表明，黑炭效率增加明显高于充电条件下粉煤灰颗粒的效率。对于液滴充电的情况，亚微米尺寸范围内的黑碳的最高效率增加高达60％，而粉煤灰的含量仅为40％，在相同条件下。与颗粒充电相比，液滴充电在去除粉煤灰颗粒和黑碳中起着更大的作用，这是有利于改造常规湿式洗涤器的有益。此外，在清除后，更多的小颗粒可以粘附到大型粉煤灰颗粒的表面，而由于分形附聚物的特征，未发现这种现象。

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