| 300MW煤粉锅炉砷排放特征的实验研究 |
| 摘要点击 3496 全文点击 1756 投稿时间：2005-02-27 修订日期：2005-05-17 |
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| 中文关键词 煤 砷 烟气 粒度 飞灰 |
| 英文关键词 coal arsenic flue gas particle size fly ash |
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| 中文摘要 |
| 对某台装备静电除尘装置的300MW燃煤电站锅炉的煤,底渣,电除尘器4个电场飞灰进行取样并测定了其中砷的含量.采用美国国家环保局推荐的EPA method 29方法测定了电除尘器后排放烟气中砷分布情况.结果表明,砷主要以飞灰形式排放,占到原煤总砷量84.6%,而底渣和烟气分别只占0.53%,2.16%.直接计算砷的质量平衡率为87.2%,电除尘器后烟道中以气相形式存在的砷为2.5μg/m3.飞灰中砷的含量与粒径密切相关,随着粒度的降低而升高. |
| 英文摘要 |
| An emissions study for arsenic was conducted at a 300 MW coal-fired plant equipped with an electrostatic precipitator.The input and output streams such as coal,slag,ESP ash,and flue gas containing the post-ESP particulates were collected.Gaseous arsenic was sampled using EPA method 29 and the arsenic concentrations in the samples were measured using inductively coupled plasma atomic emission spectrometry(HG-ICP-AES).The mass balance recovery of arsenic estimated in this study was 87.2%.Arsenic concentration in stack gas was 2.5μg/m3.Approximately 0.53% of the coal-derived arsenic was incorporated into slag,84.6% of the arsenic was found on the fly ash collected by electrostatic precipitators,and 2.16% was found in the vapor phase.The relationship between arsenic concentration and ash particle size was also assessed,and arsenic is significantly concentrated in the small sized particles. |
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