Emission Characteristics and Chemical Compositions of both Filterable and Condensable Fine Particulate from Steel Plants

10.4209/aaqr.2015.06.0398

Hsi-Hsien Yang；Kuei-Ting Lee；Yueh-Shu Hsieh；Shao-Wei Luo；Ru-Jyun Huang

Stationary emission source ； Filterable PM_(2.5) ； Condensable PM_(2.5) ； Chemical composition ； Iron and steel plant

Aerosol and Air Quality Research

15卷4期（2015 / 08 / 01）

1672 - 1680

英文

Steel production is an important source of particulate matter emission. In this study, both filterable and condensable fine particulate (PM_(2.5)) emissions from an electric arc furnace (EAF) and four integrated iron and steel plants were measured. Chemical compositions including water soluble ions and metal elements of these two types of PM_(2.5) were analyzed. The results show that filterable PM_(2.5) concentrations emitted from sintering, coke making, blast furnace, basic oxygen furnace (BOF) and EAF are 1.01, 0.37, 0.16, 0.15 and 0.28mg/Nm^3, respectively. Sintering has the highest filterable PM_(2.5) emission concentrations. Condensable PM_(2.5) concentrations emitted from the above processes are 65.3, 89.7, 3.84, 1.32 and 2.02mg/Nm^3, respectively, which are much higher than filterable PM_(2.5). K, Fe, Pb and Zn concentrations are high in filterable PM_(2.5) for sintering process, which is attributed to the feedstocks of recycled materials. High sulfur content of the feedstocks results in high concentrations of SO_4^(2-) for all the test plants. In addition to Fe, the emissions of Pb, Zn and Sn are high for EAF, which is due to the complexity of the recycled steel feedstock for EAF. SO_4^(2-) is the highest emission ion for sinter process and coke making. For blast furnace, BOF and EAF, however, Na^+, K^+ and Cl^- are the predominated ions. For metal elements, concentrations of Na and K are highest for all the plants, which might be caused by their high potential of vaporization.