喷淋洗涤条件下水汽饱和度分布特性

为在脱硫喷淋塔中借助蒸汽相变原理促进PM_2.5凝结长大，需要在塔内建立适宜的过饱和水汽环境。基于此，建立喷淋洗涤条件下气液两相热质传递模型，系统研究了操作参数对塔内饱和度分布特性的影响规律。结果显示，通过降低喷淋液温度、增加塔进口烟气含湿量，以及在喷淋区上方添加蒸汽均能够在塔内建立过饱和水汽环境；采用较大的液气比、较小的喷淋液滴直径有利于水汽饱和度的提高。获得了改变操作参数在脱硫喷淋塔内建立过饱和水汽环境的措施，对实际的脱硫除尘工艺的设计和运行具有指导意义。

Properties of water vapor supersaturation under spray scrubbing conditions

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.