Study on Particles Wetted by the Calcium-Based Slurries and the SlurriesViscosity with the Wetting Agents

摘要

Chemical agglomeration can reduce the particulates (including PM2.5) concentration emitted from fly ash particulatesand the wet flue gas desulfurization (WFGD) system. However, the calcium-based slurries affect the regulationof agglomeration compare to water, in particular, the wettability of the particulates and the viscosity of the calcium-basedslurry. The wettability and the viscosity are of the important factors affecting agglomeration, conversely. This manuscriptstudied the two factors in the calcium-based slurries. The sessile drop method was used to measure the contact angle. Fourkinds of calcium-based slurries (CaCO3, CaSO3, CaSO4, Ca(OH)2) respectively mixed with five kinds of wetting agentswet particles, and the wetting regulation was studied. The viscometer was used to measure the viscosity of the calciumbasedslurry with the wetting agents, and the variation of the viscosity was analysed as well. The results showed that thesmaller the particle size was, the more difficult to be wet, and the wetting agents could enhance the wettability greatly, butthe effect was related to the properties of the calcium-based material and the wetting agents. There were variable viscositiesfor different calcium-based slurries after adding the wetting agents. Overall, the Compound No. 3 had the optimalqualities in improving particle wettability and maintaining the calcium-based slurry with a high viscosity. Thereby theCompound No. 3 is optimal in facilitating chemical agglomeration.