Affiliation:
1. Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science and Engineering Department of Atmospheric and Oceanic Sciences & Institute of Atmospheric Sciences National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary Institute of Atmospheric Sciences Fudan University Shanghai China
2. Shanghai Institute of Eco‐Chongming (SIEC) Shanghai China
3. Jiangsu Province Engineering Research Center of Synergistic Control of Pollution and Carbon Emissions in Key Industries Jiangsu Environmental Engineering Technology Co., Ltd. Nanjing China
4. IRDR International Center of Excellence on Risk Interconnectivity and Governance on Weather/Climate Extremes Impact and Public Health Fudan University Shanghai China
Abstract
AbstractOzone‐depleting substances (ODSs) are well known as primary emission from the production and consumption of traditional industrial sectors. Here, we reported the unintentional emission of ODSs from iron and steel plants as a new source, basing on real‐world measurements of flue gases emitted from their major processes. The sintering was found to be the major emission process of ODSs, including chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), halons, methyl halide (CH3Cl), methyl chloroform, carbon tetrachloride, methyl bromide and halogenated very short‐lived substances. The median emission factors of CFC‐113, CFC‐115, HCFC‐22, and CH3Cl for typical sintering processes are 1.7, 0.7, 44.5 and 237.0 mg/t, respectively. Quantum chemical calculation figures out that the ODS species are mainly formed in the low efficiency combustion process of halogenated materials. Annual amounts of ODS and CFC‐11‐equivalent emissions were estimated to be 1,785 tons and 78 tons in 2019 over mainland China, respectively. Given these findings, this study provides a new prospective on searching for ODS emission sources, especially unintentional sources such as iron and steel industry and other combustion related activities.
Funder
Ministry of Science and Technology of the People's Republic of China
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Publisher
American Geophysical Union (AGU)