摘要
湿法脱硫是我国煤电行业的主导技术,由于湿法脱硫烟气排放过饱和,含有大量的水分,对SO_(2)的测定带来巨大的干扰。利用现有的SO_(2)测量方法,特别是针对超低排放的湿法脱硫技术,需要考虑烟气中水分的影响。石灰石-石膏湿法脱硫后烟气冷凝水的pH值为2,低于脱硫浆液,说明脱硫后烟气携带的水中溶解了部分SO_(2)。为了避免水的干扰,红外线在线连续排放监测系统(CEMS)配备了一个除水装置。采用传统的冷凝水脱除方法时,冷凝水溶解SO_(2),导致烟气中SO_(2)浓度相对较低。采用适当的除水方法,可有效避免因SO_(2)溶于凝析水而引起的测量误差。
Wet desulfurization is the dominant technology in my country’s coal power industry.Due to the over-saturation of wet desulfurization flue gas emissions and a large amount of moisture,it will cause great interference to the determination of SO_(2).The use of existing SO_(2)measurement methods,especially for ultra-low emission wet desulfurization technology,needs to consider the impact of moisture in the flue gas.The pH value of the flue gas condensate after limestone-gypsum wet desulfurization is 2,which is lower than the desulfurization slurry,indicating that some SO_(2)is dissolved in the water carried by the flue gas after desulfurization.In order to avoid water interference,the infrared on-line continuous emission monitoring system(CEMS)is equipped with a water removal device.When the traditional condensed water removal method is used,the condensed water dissolves SO_(2),resulting in a relatively low concentration of SO_(2)in the flue gas.Using proper water removal methods can effectively avoid measurement errors caused by SO_(2)dissolving in condensate water.
作者
李伟
LI Wei(Jinkong Power Tashan Power Generation Shanxi Co.,Ltd.,Datong 037000,China)
出处
《应用能源技术》
2021年第10期13-16,共4页
Applied Energy Technology
关键词
火电机组脱硫
CEMS系统
升级改造
desulfurization of thermal power unit
CEMS system
upgrading
