燃煤电厂脱硫废水分型与浓缩过程的盐类析出规律  

Salt Precipitation Behaviors of Classification and Concentration Process for Desulfurization Wastewater in Coal-fired Power Stations

作　　者：张娟 曹兆军 史海红 刘德育 孙浩 赵亮 赵鋆 常静宇 ZHAGN Juan;CAO Zhaojun;SHI Haihong;LIU Deyu;SUN Hao;ZHAO Liang;ZHAO Yun;CHANG Jingyu(Shanghai Power Equipment Research Institute Co.,Ltd.,Shanghai 200240,China;Yancheng Thermoelectric Limited Liability Company,Yancheng 224000,Jiangsu Province,China;College of Chemical Engineering and Materials Science,Tianjin University of Science and Technology,Tianjin 300222,China;College of Marine and Environmental Sciences,Tianjin University of Science and Technology,Tianjin 300457,China)

机构地区：[1]上海发电设备成套设计研究院有限责任公司,上海200240 [2]盐城热电有限责任公司,江苏盐城224000 [3]天津科技大学化工与材料学院,天津300222 [4]天津科技大学海洋与环境学院,天津300457

出　　处：《动力工程学报》2022年第1期67-74,共8页Journal of Chinese Society of Power Engineering

基　　金：上海成套院科技发展基金资助项目(201701091J)。

摘　　要：为揭示石灰石-石膏法脱硫废水强制蒸发过程的盐类析出规律,将我国多个电厂脱硫废水的化学组成划分为硫酸盐型的氯化钠亚型、硫酸镁亚型及氯化物型的氯化钠亚型3个典型体系,对3个分型的典型废水在模拟常压(101.3 kPa)和负压(50 kPa)下进行定压强制蒸发,获得了液相密度、沸点升、液相组成和析出固相等的蒸发浓缩和析盐规律。结果表明:硫酸盐型废水蒸发主要析出物的顺序为硫酸钙、硫酸镁、氯化钠,氯化物型废水蒸发主要析出物的顺序为硫酸钙、氯化钠;在蒸失率80%以下时,废水蒸发过程中主要析出物为硫酸钙盐,在蒸失率80%以上时,可实现氯化钠的大量析出;硫酸盐型硫酸镁亚型较氯化物亚型更难析出氯化钠。To reveal the salt precipitation behaviors of limestone gypsum desulfurization wastewater in the forced evaporation process, the desulfurization wastewater of several power plants in China was divided into three typical systems: sulfate sodium chloride subtype, magnesium sulfate subtype and chloride sodium chloride subtype. Three typical wastewater types were forced to evaporate under simulated atmospheric pressure(101.3 kPa) and negative pressure(50 kPa), obtaining the behaviors of liquid density, boiling point raising, liquid composition and solid salt precipitated during evaporation process. Results show that the order of the main precipitates in sulfate wastewater evaporation is calcium sulfate, magnesium sulfate and sodium chloride, while the order of the main precipitates in chloride wastewater evaporation is calcium sulfate and sodium chloride. When the evaporation loss rate is less than 80%, the main precipitate in the wastewater evaporation process is calcium sulfate. When the evaporation loss rate is more than 80%, a large amount of sodium chloride can be precipitated. Sulfate type magnesium sulfate subtype is more difficult to precipitate sodium chloride than chloride subtype.

关 键 词：脱硫废水 析盐规律 蒸发 结晶 

分 类 号：X703[环境科学与工程—环境工程]