Effect of Phosphoric Acid Spray on Pressure Drop of Fabric Filter and Physical Property of Fly Ash in Solid Waste Incinerator = Effect of Phosphoric Acid Spray on Pressure Drop of Fabric Filter and Physical Property of Fly Ash in Solid Waste Incinerator

다국어 초록 (Multilingual Abstract)

Fabric filter is one of representative particulate matter collection device for flue gas treatment. Particulate matter captured on the fabric filter forms layer but it causes a pressure drop. It was reported that pressure drop of bag house had decreased significantly when wastewater including phosphoric acid was sprayed to incinerate. Phosphoric acid in wastewater was considered to influence the decrease of pressure drop in bag house. In this work, a bench scale of experimental apparatus simulating fabric filter was prepared to reveal the effect of phosphoric acid spray on pressure drop of fabric filter and physical property of fly ash as well. Pressure drop of fabric filter, the amount of fly ash discharged by pulse jet, air permeability coefficient of fly ash layer on fabric filter, and particle size distribution and circularity of fly ash were measured under the experiments of spraying different concentration of phosphoric acid solution to fabric filter. As the results, it was found that the increase of pressure drop was suppressed when phosphoric acid was sprayed by 3wt% as the weight ratio of phosphorus to fly ash. From the increases of air permeability coefficient of fly ash layer on fabric filter and of particle fraction > 200 μm with low circularity, the increase of pressure drop seemed to be suppressed by the change of physical property of fly ash. However, the effect of phosphoric acid spray on pressure drop of fabric filter was reduced as it continued for a long time. For the effective use of phosphoric acid solution, the intermittent spray method should be investigated in further study.