| 典型钢铁行业汞排放特征及质量平衡 |
| 摘要点击 3452 全文点击 1723 投稿时间：2015-06-12 修订日期：2015-07-25 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 钢铁工业 汞 排放特征 排放因子 质量平衡 |
| 英文关键词 iron and steel industry mercury emission characteristics emission factor mass balance |
|
| 中文摘要 |
| 以重庆市某钢铁企业各工艺单元的进出物料为研究对象,分析样品总汞及各物料中汞的输入输出量,初步探讨钢铁生产各工序汞的排放特性及其质量平衡. 结果发现,各工艺输入物料汞含量为2.93~159.11 μg ·kg-1,其中,高炉所用块矿汞含量最高,其次为烧结以及高炉用煤. 输出物料中汞含量为3.09~18.13 μg ·kg-1,除尘灰汞含量最高,其次为转炉渣. 该钢铁企业自备焦化厂汞输入量和输出量分别为1346.74 g ·d-1±36.95 g ·d-1和177.42 g ·d-1±13.73 g ·d-1,焦化工序中的汞主要来源于焦煤的燃烧. 钢铁生产过程中烧结工序汞输入量最高,为1075.27 g ·d-1±60.89 g ·d-1,占钢铁生产总汞带入量的68.06%,其来源主要是铁矿粉. 固体输出物料中,烧结工序输出汞量为14.15 g ·d-1±0.38 g ·d-1,占总固体输出量22.61%. 经估算,该钢铁企业2013年汞排放量约为553.83 kg,汞排放因子为0.092 g ·t-1钢产量. 为控制汞排放,钢铁企业应结合生产实际,进一步降低焦化以及烧结工序能耗水平,或提高原料质量,减少汞的输入. |
| 英文摘要 |
| To preliminarily discuss the mercury emission characteristics and its mass balance in each process of the iron and steel production, a typical iron and steel enterprise was chosen to study the total mercury in all employed materials and estimate the input and output of mercury during the steel production process. The results showed that the mercury concentrations of input materials in each technology ranged 2.93-159.11 μg ·kg-1 with the highest level observed in ore used in blast furnace, followed by coal of sintering and blast furnace. The mercury concentrations of output materials ranged 3.09-18.13 μg ·kg-1 and the mercury concentration of dust was the highest, followed by converter slag. The mercury input and the output in the coking plant were 1346.74 g ·d-1±36.95 g ·d-1 and 177.42 g ·d-1±13.73 g ·d-1, respectively. In coking process, mercury mainly came from the burning of coking coal. The sintering process was the biggest contributor for mercury input during the iron and steel production with the mercury input of 1075.27 g ·d-1±60.89 g ·d-1 accounting for 68.06% of the total mercury input during this production process, and the ore powder was considered as the main mercury source. For the solid output material, the output in the sintering process was 14.15 g ·d-1±0.38 g ·d-1, accounting for 22.61% of the total solid output. The mercury emission amount from this studied iron and steel enterprise was estimated to be 553.83 kg in 2013 with the emission factor of 0.092 g ·t-1 steel production. Thus, to control the mercury emissions, iron and steel enterprises should combine with production practice, further reduce energy consumption of coking and sintering, or improve the quality of raw materials and reduce the input of mercury. |
|
|
|
