典型燃煤电厂汞的分布、迁移及释放特征研究
Distribution, Migration and Emission of Mercury in Representative Coal-fired Power Plants in China
查看参考文献36篇
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文摘
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采集安徽不同地区两典型燃煤电厂火力发电中使用的原煤及其产生的3类固体副产物(飞灰,炉渣及脱硫石膏样品),对4类样品中汞含量分别进行测定,以此揭示电厂燃煤过程中汞的分布、迁移及转化规律。此外,采用质量平衡及二次排放模型分别初步估算了电厂燃煤及燃煤固体副产物再利用过程中汞的两次释放特征。结果显示,汞在原煤、飞灰、炉渣及脱硫石膏样品中的含量分别为174~321 μg/kg、421~316 μg/kg、6~3 143 μg/kg和2 988~4 694 μg/kg;燃煤过程中有20.9%~23.6%的汞转移到飞灰中,32.6%~59.9%的汞赋存于脱硫石膏中,16.5%~37.4%的汞通过烟囱首次排入大气,仅有0.02%~9.2%的汞残留在炉渣中。二次排放模拟结果显示,燃煤电厂1#和2#中飞灰和脱硫石膏的高温再利用过程将向大气二次释放汞量96.0 kg/a和165.8 kg/a,两次年排放总量分别为189.5 kg和640.8 kg。本研究可为燃煤电厂汞的污染过程控制提供参考依据。 |
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其他语种文摘
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Feed coal and three types of solid by-products of coal (including the slag, fly ash and WFGD gypsum) in two representative coal-fired power plants in Anhui Province, China were collected, and mercury contents and speciation in four types of samples were determined using direct mercury analyzer, then mercury distribution and transformation rules during the coal-fired process were discussed. In addition, twice mercury release characteristics in coal and its solid by-products were estimated using mass balance model and the re-emission model, respectively. Results show that mercury contents in feed coal, slag, fly ash and WFGD gypsum are 174~321 μg/kg, 421~316 μg/kg, 6~3 143 μg/kg and 2 988~4 694 μg/kg, respectively. Mass balance model suggests that shares of Hg in fly ash, WFGD gypsum and flue gas in 1# and 2# power plants, are 20.9~23.6%, 32.6~59.9% and 16.5~37.4%, respectively and only 0.02~9.2% of Hg exists in the slag. Re-emission model calculation simulation results display that during the high temperature re-utilization using byproducts (fly ash and WFGD gypsum) from 1# and 2# coal-fired power plants to produce cement and gypsum wallboard, the mercury emitted to air are about 96.0 kg/a and 165.8 kg/a, respectively. Combined with two calculations for the mercury emission, this work obtained that the total Hg released to air are about 189.5 kg/a and 640.8 kg/a for 1# and 2# power plants, respectively. The present study could provide reference for pollution control of mercury during the power generation process of coal-fired power plants. |
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来源
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地球与环境
,2018,46(1):43-49 【核心库】
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DOI
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10.14050/j.cnki.1672-9250.2018.46.006
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关键词
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燃煤电厂
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汞
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分布特征
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排放量
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地址
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1.
安徽大学资源与环境工程学院, 合肥, 230601
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550002
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(徐州)中国矿业大学, 煤层气资源与成藏过程教育部重点实验室, 江苏, 徐州, 221008
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东南大学能源与环境学院, 源热转换及其过程测控教育部重点实验室, 南京, 210096
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-9250 |
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学科
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环境科学基础理论;环境污染及其防治 |
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基金
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国家973计划
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国家自然科学基金
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安徽省高校省级自然科学研究重点项目
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煤层气资源与成藏过程教育部重点实验室(中国矿业大学)开放基金资助项目
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安徽大学博士启动基金
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中国博士后科学基金
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文献收藏号
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CSCD:6178807
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