摘要
燃煤电厂非常规污染物的排放尚未引起足够的重视。为全面表征燃煤电厂非常规污染物脱除性能,针对某1000 MW燃煤超低排放机组,分别采用FPM和CPM一体化采样系统、安大略法(OHM)、控制冷凝法、HJ 646-2013规定的有机物测试方法,系统研究了CPM、Hg、SO3、PAHs等非常规污染物的梯级脱除特性。结果表明:100%、75%负荷时低-低温电除尘系统对CPM脱除率分别为87.15%、92.20%,湿法脱硫分别为49.65%、45.55%,不同负荷下FPM分别为3.6、4.4 mg·m^−3,但CPM却分别达14.2、15.3 mg·m^−3,CPM的浓度远超FPM;低-低温电除尘系统脱Hg效率为64.81%,整个系统的脱Hg效率为75.5%,Hgp全部被脱除,剩余的是难以脱除的Hg0、Hg^2+,脱除率分别为为63.01%、64.29%,Hg0排放浓度为5.4μg·m^−3,Hg^2+排放浓度为0.5μg·m−3;SCR脱硝催化剂将SO2氧化成SO3的转化率约为0.7%,低-低温电除尘系统可脱除88.7%的SO3,湿法脱硫对SO3的脱除率为29.63%,最终SO3排放浓度为1.9 mg·m^−3;全系统对16种PAHs脱除率达94.25%,其中,气相、固相脱除率分别为91.61%、99.27%,最终气相、固相PAHs排放浓度分别为2.39μg·m−3和0.11μg·m^−3。现有超低排放设备对非常规污染物均有不同程度的协同脱除效果,满负荷条件下该机组CPM、Hg、SO3、PAHs排放浓度分别为14.2 mg·m^−3、5.9μg·m^−3、1.9 mg·m^−3、2.5μg·m^−3,Hg的排放浓度满足火电厂大气污染物排放标准(GB 13223-2011)中30μg·m^−3的要求,CPM、SO3、PAHs尚无国家强制排放标准。本研究结果可为燃煤电厂后续非常规污染物的控制提供参考。
The emission of unconventional pollutants from coal-fired power plants has not received enough attention.In order to fully characterize the removal characteristics of unconventional pollutants from coal-fired power plants,the step removal characteristics of CPM,Hg,SO3,PAHs and other abnormal pollutant from a 1000 MW coal-fired ultra-low emission unit were systematically studied by using FPM and CPM integration sampling system,Ontario method(OHM),controlling condensate method,HJ 646-2013 unit test method.The results showed that at 100%and 75%loadings,the removal efficiencies of CPM were 87.15%and 92.20%by the low-low-temperature electric dust removal system,respectively,and wet desulfurization efficiencies were 49.65%and 45.55%,respectively.At different loadings,FPM emission concentrations were 3.6 and 4.4 mg·m^−3,respectively,but CPM emission concentrations were 14.2 and 15.3 mg·m−3,the latter ones were much higher than the former ones.The Hg removal efficiency of low-low-temperature electric dust removal system was 64.81%,and the Hg removal efficiency of the whole system was 75.5%.Hgp was totally removed,and the remaining ones were Hg0 and Hg2+being hard to remove,their removal efficiencies were 63.01%and 64.29%,respectively.The emission concentrations of Hg0 and Hg2+were 5.4μg·m^−3 and 0.5μg·m^−3,respectively.The conversion rate of SO2 oxidized to SO3 by SCR denitration catalyst was about 0.7%.The low-low-temperature electric dust removal system could remove 88.7%SO3 in the gaseous state,the wet desulfurization could remove 29.63%SO3,the final SO3 emission concentration was 1.9 mg·m^−3.The removal efficiency of 16 kinds of PAHs from the whole system reached 94.25%,of which the removal efficiencies of gas and solid phase PAHs were 91.61%and 99.27%,respectively,their corresponding emission concentrations were 2.39 and 0.11μg·m^−3,respectively.The existing ultra-low emission equipment had different levels of collaborative removal effect of unconventional pollutants,the emission concentrations
作者
柴小康
黄国和
解玉磊
李薇
CHAI Xiaokang;HUANG Guohe;XIE Yulei;LI Wei(College of Environmental Science and Engineering,North China Electric Power University,Beijing 102206,China;School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2020年第12期3480-3494,共15页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金青年基金资助项目(71603016,51609003)。
关键词
非常规污染物
燃煤电厂
可凝结颗粒物
汞
三氧化硫
多环芳烃
脱除率
unconventional pollutants
coal-fired power plant
condensable particulate matter
Hg
SO3
polycyclic aromatic hydrocarbon
removal efficiency
