300 MW燃煤机组超高石灰铝沉淀耦合活性炭吸附脱除废水中重金属研究  

Study on the Removal of Heavy Metals From Wastewater by Ultra High Lime With Aluminum Precipitation Coupling Activated Carbon Adsorption in 300 MW Coal-Fired Units

作　　者：刘更生 张建永 孙权 曹山 宫安琪 姜林 张永生[2] LIU Gengsheng;ZHANG Jianyong;SUN Quan;CAO Shan;GONG Anqi;JIANG Lin;ZHANG Yongsheng(Sanhe Power Generation Co.,Ltd.,Sanhe 065201,Hebei Province,China;School of Energy,Power and Mechanical Engineering,North China Electric Power University,Changping District,Beijing 102206,China)

机构地区：[1]三河发电有限责任公司,河北省三河市065201 [2]华北电力大学能源动力与机械工程学院,北京市昌平区102206

出　　处：《发电技术》2024年第5期959-968,共10页Power Generation Technology

基　　金：国家自然科学基金项目(52276110)。

摘　　要：【目的】燃煤电厂湿法烟气脱硫技术产生了大量含有重金属的废水,为脱除废水中的重金属,提出了氧化钙和偏铝酸钠沉淀耦合活性炭吸附法。【方法】在实验室研究沉淀法投料比、温度和pH值对吸附特性的影响,并对吸附剂种类和吸附层高参数进行优化。基于此,在三河电厂300 MW燃煤机组进行工程实验,在现场设备基础上加沉淀剂给料机与吸附装置并考察吸附效果。【结果】在最佳投料速度为160 kg/h、流速为1 m3/h、吸附高度为10 cm时,重金属脱除效率整体有明显提升。对比电厂原出口重金属含量,加装混合沉淀吸附装置后,铅、铬、铜、镍脱除效率分别提高了33.24%、81.93%、35.22%、57.52%。【结论】氧化钙和偏铝酸钠沉淀耦合活性炭吸附法能够有效地促进脱硫废水中重金属的脱除,为燃煤电厂废水的深度脱除提供了数据指导。[Objectives]The wet flue gas desulphurization of coal-fired power plants generates a large amount of wastewater containing heavy metals,the removal of heavy metals from wastewater by coupling of limestone and sodium metaaluminate precipitation and activated carbon adsorption were studied.[Methods]The optimized feed ratio,temperature,and pH value for the precipitation method were obtained,and the experimental parameters for the type of adsorbent and adsorption layer height were optimized.Based on this,engineering tests were conducted on the 300 MW unit of Sanhe coal-fired power plant.Field experiments were conducted with an additional precipitator feeder and adsorption device,and effect was investigated.[Results]The optimal feeding rate is 160 kg/h,the flow rate is 1 m3/h,and the adsorption height is 10 cm.Under the experimental conditions,the overall heavy metal removal efficiency is significantly improved.Compared with the heavy metal content in the original export of the power plant,the removal efficiency of lead,chromium,copper,and nickel from the export increase by 33.24%,81.93%,35.22%,and 57.52%,respectively,after installing a mixed precipitation and adsorption device.[Conclusions]The method of coupling of limestone and sodium metaaluminate precipitation and activated carbon adsorption can effectively promote the removal of heavy metals from desulfurization wastewater,providing guidance for the deep removal of heavy metals in the wastewater from coal-fired power plants.

关 键 词：燃煤机组 脱硫废水 重金属 超高石灰铝法 活性炭 吸附 

分 类 号：TK09[动力工程及工程热物理] X773[环境科学与工程—环境工程]