| 高炉炼铁工艺细颗粒物PM2.5排放特性分析 |
| 摘要点击 3754 全文点击 1915 投稿时间：2014-02-12 修订日期：2014-03-26 |
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| 中文关键词 高炉炼铁 细颗粒物(PM2.5) 粒径分布 化学组分 颗粒形貌 |
| 英文关键词 blast furnace iron making PM2.5 particle-size distribution chemical composition particle morphology |
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| 中文摘要 |
| 采用静电低压撞击器（electrical low pressure impactor，ELPI）对高炉出铁场、矿槽除尘后细微颗粒物（PM2.5）的粒径及质量浓度分布进行在线分析. 结果表明，出铁场除尘后PM2.5粒数浓度在105~106 cm-3数量级范围内，主要为粒径小于0.1 μm的颗粒物，而矿槽除尘后PM2.5粒数浓度在104~105 cm-3数量级范围内，主要为粒径1.0 μm以下的颗粒物，质量浓度呈单峰分布；PM2.5化学组成分析表明水溶性离子SO42-、K+、Ca2+含量较高，分别为10.32%~28.55%、10.36%~12.15%、3.97%~15.4%；主量元素主要为Fe、Si、Al，含量分别为16.8%~31.62%、2.24%~8.76%、1.24%~5.89%；含碳组分OC和EC在PM2.5中的含量也较为丰富，分别为2.7%~4.6%和0.8%~1.3%. PM2.5单体颗粒形态主要为球状颗粒和不规则颗粒. 高炉出铁场、矿槽除尘后PM2.5的排放因子分别为0.045~0.085 kg ·t-1、0.042~0.071 kg ·t-1. |
| 英文摘要 |
| Electrical low pressure impactor (ELPI) was used to online analyze the PM2.5 particle size and mass concentration distribution in the trapping field and ore tank of blast furnace iron-making plant. Results showed that the grain number concentration of PM2.5 in trapping field after dust removal was in the range of 105-106cm-3, and the particle size was mainly below 0.1 μm. While the grain number concentration of the PM2.5 in ore tank after dust removal was in the range of 104-105 cm-3, the particle size was mainly below 1.0 μm, and the mass concentration distribution showed a single peak. The micro-morphology of PM2.5 monomer was mainly divided into two categories, spherical particles and irregular aggregates. Chemical composition analysis indicated that the concentrations of water soluble SO42-, K+, Ca2+ were higher than other ions in PM2.5, with the percentage of 10.32%-28.55%, 10.36%-12.15%, 3.97%-15.4%, respectively. The major elements was Fe, Si, Al, with 16.8%-31.62%, 2.24%-8.76%, 1.24%-5.89% of total mass, respectively; organic carbon and elementary carbon were 2.7%-4.6% and 0.8%-1.3%, respectively. The emission factors of PM2.5 in trapping field and in ore tank after dust removal were ranged from 0.045 to 0.085 kg ·t-1 and 0.042 to 0.071 kg ·t-1, respectively. |
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