Abstract:

In order to achieve growth of PM_2.5 fine particles by water vapor condensation using a flue gas desulfurization (FGD) spray scrubber, it is necessary to create a supersaturated water vapor atmosphere in the scrubber.Based on this, heat and mass transfer models between gas and liquid phase under spray scrubbing conditions were established, and the influences of operation parameters on water vapor supersaturation were investigated.The results showed that supersaturated water vapor atmosphere can be produced by lowering the spray liquid temperature, increasing the moisture content of the flue gas, as well as adding steam in the top of the scrubber above the spray liquid inlet.A higher liquid-to-gas ratio and smaller spray droplets favored the formation of supersaturated water vapor atmosphere.The measures for creating a suitable degree of water vapor supersaturation through changing the operation parameters were obtained.The research results are helpful to guiding practical design and operation of the desulfurization and dust removal process.