College of Geology and Environment, Xi'an University of Science and Technology, Xi'an, 710054, China.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing, 100085, China.
Bull Environ Contam Toxicol. 2021 Apr;106(4):670-675. doi: 10.1007/s00128-021-03105-x. Epub 2021 Jan 23.
Electric arc furnaces (EAFs) in steelmaking plants are a major source of dioxins. Preheating of steelmaking raw materials is widely used in EAFs to reduce energy consumption. Few studies have investigated emissions of dioxin-like polychlorinated biphenyls (PCBs) from EAFs, and the PCB emission levels and characteristics during preheating are unknown. In this study, PCB concentrations and distributions in stack gases emitted during EAF preheating were determined. The average dioxin-like PCB concentrations in stack gases emitted during preheating of three EAFs were 1236.1, 81,664.4, and 669.8 pg/Nm, respectively. These values were greatly influenced by the composition of the steelmaking raw materials. The PCB profiles in all samples were dominated by less-chlorinated homologs. PCB emission factor for preheating in the EAFs is 0.58 µg WHO-TEQ/ton averagely, indicating significant emissions of PCBs from preheating process. The data will be useful for developing approaches for preventing and controlling PCB emissions from EAFs.
电弧炉（EAF）是炼钢过程中的主要二恶英来源。在电弧炉中广泛使用炼钢原料预热以降低能耗。很少有研究调查过电弧炉中二恶英类多氯联苯（PCBs）的排放，并且在预热过程中二恶英类 PCB 的排放水平和特性是未知的。在本研究中，确定了在电弧炉预热期间排放的烟道气中二恶英类 PCB 的浓度和分布。在三个电弧炉预热期间排放的烟道气中二恶英类 PCB 的平均浓度分别为 1236.1、81664.4 和 669.8 pg/Nm，这些值受到炼钢原料组成的极大影响。所有样品中的 PCB 分布均以低氯化同系物为主。电弧炉预热的 PCB 排放因子为 0.58µg WHO-TEQ/吨平均值，表明从预热过程中排放了大量的 PCBs。这些数据对于开发从电弧炉中预防和控制 PCB 排放的方法将是有用的。
