In order to deal with the chloride ions enriched in FGD wastewater which arises from the control of SO2 emissions, ZLD technology is widely applied in coal-fired power plants. One of the technologies to achieve ZLD is spraying atomized FGD wastewater into the duct between the air preheater and ESP, and the purpose of this study is to figure out the evaporation characteristics of FGD wastewater for greater efficiency. According to the calculating results with variable parameters of atomized droplet particles, it could be concluded that increasing the original temperature, reducing the injection velocity, or reducing the original diameter of the FGD wastewater droplet particles is beneficial to improve evaporation efficiency. Of these three measures, the last one is the most effective due to the quickly-finished preheating process which accelerates the evaporation.
Keywords FGD wastewater, evaporation efficiency, duct, droplet particles