火电厂脱硫废水高温雾化蒸发实验研究

EXPERIMENTAL RESEARCH ON HIGH TEMPERATURE ATOMIZING EVAPORATION FOR DESULFURIZATION WASTEWATER TREATMENT IN THERMAL POWER PLANT

采用现行常规方法处理的火电厂脱硫废水,存在设备故障率高、难以去除重金属离子和无法除去氯离子等诸多缺点。模拟火电厂运行的实际情况,利用省煤器和除尘器之间的高温烟气,将雾化的脱硫废水瞬间蒸发成固体颗粒物,通过除尘器除去蒸发的固体颗粒物,从而解决常规方法难以除去的部分重金属离子和氯离子问题。实验对温度、pH、蒸发速率、固体颗粒物吸湿性、高温雾化后SEM图片分析等关键问题进行讨论,分析高温雾化蒸发的可行性,实验结果表明,温度在170℃以上,pH调整到中性时雾化效果最好,颗粒物雾化后比表面积大,水分瞬间蒸发,不会有凝结水等现象发生,从而实现了脱硫废水的零排放。

The current conventional method for treatment of thermal power plant desulfurization wastewater exists many disadvantages including the equipment failure rate high,heavy metal removed difficulty and unable to eliminate chlorine ion and so on. By simulating actual situation of power plant running,useing high temperature flue gas between the economizer and dust collector make the atomized desulfurization wastewater vaporised into solid particles,and then solid particles were evaporatel by the dust remover. The key problem of experiment,such as temperature,pH,evaporation rate,solid particle hygroscopicity,SEM image after solid particle atomized by high temperature are discussed in this paper,and it analyzed the feasibility of high temperature atomization and evaporation. The experimental results show that,when the temperature was over170 ℃,the best pH adjusted to neutral,the atomizing effect was best,which after atomizated,its surface area was laryer,moisture was evaporatied in a instant,so that no condensation water,thus achieving zero discharge of desulfurized wastewater.