脱硫废水烟道蒸发工艺影响因素实验研究

Experimental Research on Influencing Factors of Flue Evaporation Treatment for Desulfurization Wastewater

燃煤电厂湿法烟气脱硫后所产生的废水可采用烟道喷雾蒸发的方式进行处理以达到电厂废水零排放的目的。为获取脱硫废水喷雾蒸发处理工艺的最佳蒸发条件,重点研究了该过程中烟气温度、烟气流速、废水流量与废水初始温度、双流体喷嘴中压缩空气与废水混合的气液比等因素对脱硫废水蒸发性能的影响,实验结果表明:烟气温度升高有利于提高废水蒸发率,为实现烟道快速蒸发,将烟温控制在180℃左右为宜;同时,烟气流量越大则废水蒸发量越大;压缩空气量与脱硫废水量的气液比越大越有利于废水雾化蒸发,其中压缩空气的压强对雾化效果有着重要的影响;废水流量增大到某临界值后若继续增大则不利于废水蒸发;而废水初始温度对废水蒸发量的影响不大。该实验研究为该技术的工业化应用提供了基础数据。

Wet flue gas desulfurization wastewater in coal-fired power plants can be treated by the way of spray evaporation to achieve the goal of wastewater zero discharge. To obtain optimum evaporation conditions of spray evaporation for the desulfurization wastewater treatment process, this paper mainly studied the flue gas temperature, velocity of flue gas and wastewater flow rate and the initial temperature of wastewater, the two-fluid nozzle compressed air mixed with the wastewater of gas liquid ratio and other factors affect the performance of wastewater evaporation, the experimental results show that the flue gas temperature is beneficial to increase the rate of wastewater evaporation, for the realization of the evaporation quickly, to control the gas temperature about 180℃ advisable; At the same time, the greater the flue gas flow rate, the greater the wastewater evaporation; the vapor liquid ratio is good for the evaporation, The pressure of the compressed air has an important influence on atomization effect; when the wastewater flow rate increases to a certain critical value, if continued to increase, it may has bad effect on wastewater evaporation; The initial temperature of wastewater has little effect on evaporation.This study provides the basic data for the industrial application of this technology.