煤焦化过程苯系物的排放特征及稳定碳同位素组成  

Emission characteristics and stable carbon isotope composition of BTEX in coal coking process

作　　者：牟玲[1,2] 冯传阳 李杨勇 李晓帆 刘添 刘紫叶 姜辛 MU Ling;FENG Chuan-yang;LI Yang-yong;LI Xiao-fan;LIU Tian;LIU Zi-ye;JIANG Xin(College of Environmental Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Institute of Nuclear Environmental Science,China Institute for Radiation Protection,Taiyuan 030006,China)

机构地区：[1]太原理工大学环境科学与工程学院,山西太原030024 [2]中国辐射防护研究院核环境研究所,山西太原030006

出　　处：《中国环境科学》2023年第6期2806-2813,共8页China Environmental Science

基　　金：国家自然科学基金资助项目(42077280);山西省应用基础研究计划(201901D11065);山西省重点研发计划(201903D311005)。

摘　　要：选取山西省典型焦化厂开展不同生产工序苯系物(BTEX)样品采集,分析5种主要BTEX组分的排放特征及稳定碳同位素组成(δ^(13)C),并对我国焦化行业BTEX排放量及不确定性进行了估算.结果表明:炼焦过程BTEX总排放因子为16649mg/t焦炭,其中焦炉烟气BTEX排放因子最高(7167mg/t),其次为出焦(6454,1825mg/t)、污水处理(1096mg/t)和化产回收废气(112.7mg/t);与燃煤不同,苯是炼焦过程排放的优势特征物种(86.12%),其次是甲苯(11.45%);炼焦过程排放BTEX的δ^(13)C值为-27.10‰~-32.58‰,不同生产工序δ^(13)C值无显著差异;煤焦化过程排放的苯/甲苯比值(B/T)和苯的δ^(13)C值具有特异性,可作为区分炼焦与其他污染源的指示物;2020年我国焦化行业BTEX排放量为7844t,其中山西(22.27%)、陕西(10.39%)、河北(10.24%)和内蒙古(8.96%)贡献最大.Emission characteristics and stable carbon isotopic(δ^(13)C)composition of BTEX emitted from different production processes in a typical coal coke plant were measured,and the total BTEX emissions during the coke production in China were estimated.The total emission factor(EF)of BTEX from coal coking process was 16655mg/t coke,among which the EF from coke oven flue gas was the highest(7167mg/t),followed by the flue gases from coke pushing(6454and 1825mg/t),sewage treatment(1096mg/t)and chemical byproduct recovery(112.7mg/t).The total emissions of BTEX from the coking in 2020 were 7844 tons in China,and Shanxi(22.27%),Shaanxi(10.39%),Hebei(10.24%)and Inner Mongolia(8.96%)made higher contributions.Benzene was the most abundant compound,accounting for 86.12%of the total BTEX,followed by Toluene(11.45%);andδ^(13)C of BTEX from coal coking ranged from-27.10‰to-32.58‰.There was no significant difference in the carbon isotope composition of BTEX emissions from different processes during the coal coke production,and the unique B/T(Benzene/Toluene)ratio andδ^(13)C value of benzene imply that it could be a good marker for distinguishing coking emissions from other sources in the ambient air.

关 键 词：煤焦化 山西 苯系物 碳同位素 

分 类 号：X531[环境科学与工程—环境工程]