Abstract
An industrial waste incineration facility reported that the pressure drop in a bag filter (BF) was reduced by spraying phosphoric acid wastewater (PAW) into an incinerator. In order to investigate the effect of PAW spraying on reducing BF pressure drops, 1)the past operation data of the above incineration plant was analyzed and 2)PAW spraying experiments were carried out at the same incineration plant. From the analysis of past operation data, the reproducibility of BF pressure drop reduction by PAW spraying was confirmed. Furthermore, the phosphoric acid contained in PAW was considered to cause the BF pressure drop reduction. From the results of PAW spraying experiments, it was found that the pressure drop reduction was caused by improving the gas permeability of the dust layer on the fabric as well as increasing the amount of fly ash dislodged from the BF by spraying PAW. Phosphoric acid might contribute to increasing the particles size and the aggregation of fly ash. A decrease in electric power consumption at the induced draft fan was also confirmed during PAW spraying. PAW spraying is expected to be an effective method for reducing the operating costsof waste incineration facilities.
