一貫作業煉鋼廠之原物料堆逸散性粉塵研究，目的包括：本研究所用之採樣方法與標準方法應用於逸散性粉塵採樣之比較、粒狀物垂直梯度與粒徑分布之量測、鄰近排放源之氣膠化學組成、原物料堆指紋資料建立與一貫作業煉鋼廠之原物料堆逸散性粉塵排放係數計算。線性回歸結果顯示本研究採樣方法所得之PM2.5與TSP之質量濃度分別須乘以0.28與1.87才能與標準方法之結果比較，判定係數R2分別為0.91與0.94。非標準方法與標準方法所得之PM2.5/TSP比值分別為0.188 ± 0.139與0.106 ± 0.050，非標準方法約為標準方法之1.86倍。本研究以光學微粒計數器量測距離地面1 – 27 m之粒狀物垂直梯度與粒徑分布，1 – 2 m之粒狀物質量濃度為53.82 ± 26.43 μg/m3。上風測站≥ 22 m與1 – 2 m處以及下風測站6 – 10 m處之微粒濃度較高，顯示原物料堆之逸散排放與擋風牆對逸散排放之防制效果。高濃度之微粒粒徑以≥ 10 μm為主。本研究於原物料堆置場採集周界大氣與原物料樣品，原物料樣品以≥ 2 mm之粒徑為主，化學組成以有機碳與元素碳為主；周界樣品化學組成以氯鹽、硝酸鹽、硫酸鹽、有機碳與元素碳為主。原物料樣品之化學組成分析結果可用於建立一貫作業煉鋼廠之原物料堆逸散性粉塵排放指紋資料。為判定對周界樣品貢獻之排放源化學追蹤劑，將各樣品之化學組成除以煤礦原物料樣品之化學組成，結果顯示原物料堆以外之代表性追蹤劑，PM2.5為銨鹽與硫酸鹽TSP則為銨鹽與氯鹽。本研究以質量平衡法計算一貫作業煉鋼廠之原物料堆逸散性粉塵排放係數，結果顯示PM2.5與TSP之排放係數範圍分別為-10.14至40.50 μg/m2s與-106.53至219.84 μg/m2s，TSP排放係數比PM2.5排放係數高出大約1個數量級。

The objectives of this research include: comparison of the measurement methods used in this study with standard methods for sampling fugitive dust; measuring the vertical gradient of particle size distribution; analysis of the chemical composition of ambient aerosols near emission sources, constructing the source profiles of aggregate materials, and calculating the emission factors of fugitive dust from storage piles of an integrated steel mill. The linear regression indicates that the nonstandard method for PM2.5 and TSP should be corrected with 0.28 and 1.87 with R2 being 0.94 and 0.91, respectively. The PM2.5/TSP ratio for samples from nonstandard methods is 0.188 ± 0.139, while that from standard methods is 0.106 ± 0.050, indicating that methods adopted in this study bias high by a factor of 1.86. Particles are monitored at 1 to 27 m above ground by optical particle counter. The particle concentrations are high at altitudes ≥ 22 m and 1 – 2 m at the upwind site and at altitudes 6 – 10 m at the downwind site, indicating the emissions from the storage piles and the effectiveness of windbreak wall for the control of emissions. The high concentrations are dominated by particles with diameter ≥ 10 μm. The ambient aerosols are sampled in the field while the aggregates are collected from storage piles for resuspension chamber experiment. Most of the aggregate is ≥ 2 mm. The dominant chemical species for aggregate samples are OC and EC, while those for ambient samples include Cl-, NO3-, SO42-, OC and EC. The chemical composition of aggregate materials can serve as source profiles. The results also indicate that, for both north and south wind cases, the tracers representing sources other than aggregate materials are NH4+ and SO42- for PM2.5, and those for TSP are NH4+ and Cl-. The emission factors are calculated based on the principle of mass balance. The overall ranges of PM2.5 and TSP emission factors are -10.14 to 40.50 μg/m2s and -106.53 to 219.84 μg/m2s. The EFs of TSP are higher than those of PM2.5 for around one order of magnitude.

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