600 MW褐煤机组烟气汞排放及灰特性研究  

Study on Mercury Emissions and Ash Characteristics of 600 MW Brown Coal-Fired Unit

作　　者：高志刚 陈福春 王家伟[2] 汪涛[2] 张永生[2] GAO Zhigang;CHEN Fuchun;WANG Jiawei;WANG Tao;ZHANG Yongsheng(Inner Mongolia Guohua Hulunbeier Power Generation Co.,Ltd.,Hulunbeier 021025,Inner Mongolia Autonomous,China;School of Energy Power and Mechanical Engineering,North China Electric Power University,Changping District,Beijing 102206,China)

机构地区：[1]内蒙古国华呼伦贝尔发电有限公司,内蒙古自治区呼伦贝尔市021025 [2]华北电力大学能源动力与机械工程学院,北京市102206

出　　处：《发电技术》2023年第4期543-549,共7页Power Generation Technology

摘　　要：针对目前褐煤机组汞迁移转化特性尚不清晰的研究现状,以内蒙古国华呼伦贝尔发电有限公司为例,通过30B方法测试研究了选择性催化还原(selective catalytic reduction,SCR)前后、低温省煤器前、脱硫前后烟气中的汞浓度。在319、450和550 MW负荷下,烟囱处烟气排放汞质量浓度分别为6.16、4.53和2.98μg/m^(3),随着机组负荷升高而降低。在319、450和550 MW负荷下常规烟气污染物控制装置协同脱除效率分别为31.48%、27.40%和66.59%。汞平衡计算表明,褐煤燃烧后,44.85%~65.27%的汞排放到大气中,在飞灰和石膏中富集的汞分别为27.81%~51.15%和3.95%~14.61%。飞灰测试结果表明,该电厂灰的硬度值在0.28~7.15 GPa。研究结果为烟气汞进一步深度脱除提供了基础数据。The mercury migration and conversion characteristics of the lignite unit is not clear.The mercury concentration were measured by 30B method at five flue gas sampling points(before and after SCR,before lowtemperature economizer,before and after desulfurization)in Inner Mongolia Guohua Hulunbuir Power Generation Co.,Ltd.The emission concentration of mercury in the flue gas at the stack is 6.16,4.53 and 2.98μg/m^(3)at 319,450,550 MW,respectively.The emission concentration of mercury in flue gas decreases with the increase of unit load.In addition,the pollutant control devices have a synergistic effect on the mercury removal and the co-control efficiency is 31.48%,29.68%and 66.65%at 319,450,550 MW.According to the mercury balance calculation,it can be found that after coal combustion,most of the mercury in the flue gas is discharged into the atmosphere(44.85%-65.27%),followed by fly ash(27.81%-51.15%)and gypsum(3.95%-14.61%).The fly ash test results indicate that the hardness value is between 0.28-7.15 GPa.The study results provide the basic data for further deep removal mercury from flue gas of coal-fired power plant.

关 键 词：燃煤电厂 汞 褐煤 现场采样 平衡计算 

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]