Influence of mercury and chlorine content of coal on mercury emissions from coal-fired power plants in China.
Influence of mercury and chlorine content of coal on mercury emissions from coal-fired power plants in China.
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DOI：
10.1021/es300286n
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发表时间：
2012-05
影响因子：
11.4
通讯作者：
Lei Zhang;Shuxiao Wang;Yang Meng;J. Hao
中科院分区：
文献类型：
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作者：
Lei Zhang;Shuxiao Wang;Yang Meng;J. Hao
中国是世界上最大的汞排放国，燃煤是中国最重要的汞来源。本文更新了中国煤质数据库，并根据112个现场实测数据对大气污染控制装置（APCD）的除汞效率进行了评价。建立了汞排放因子与煤中氯含量关系的子模型。分别采用确定性汞排放因子模型、非氯汞排放因子模型和氯汞排放因子模型估算了中国燃煤电厂汞排放量。利用确定性模型计算出2008年全国CFPP的汞排放量为113.3 t。基于非氯的概率排放因子模型，解决了煤中汞含量的对数正态分布，估计CFPP的汞排放量为96.5吨（P50），置信区间为57.3吨（P10）至183.0吨（P90）。基于氯的概率排放因子模型的最佳估计值为102.5吨，置信区间为71.7至162.1吨。基于氯的模型解决了氯的影响，并减少了汞排放估算的不确定性。
China is the largest mercury emitter in the world and coal combustion is the most important mercury source in China. This paper updates the coal quality database of China and evaluates the mercury removal efficiency of air pollution control devices (APCDs) based on 112 on-site measurements. A submodel was developed to address the relationship of mercury emission factor to the chlorine content of coal. The mercury emissions from coal-fired power plants (CFPPs) in China were estimated using deterministic mercury emission factor model, nonchlorine-based and chlorine-based probabilistic emission factor models, respectively. The national mercury emission from CFPPs in 2008 was calculated to be 113.3 t using the deterministic model. The nonchlorine-based probabilistic emission factor model, which addresses the log-normal distribution of the mercury content of coal, estimates that the mercury emission from CFPPs is 96.5 t (P50), with a confidence interval of 57.3 t (P10) to 183.0 t (P90). The best estimate by the chlorine-based probabilistic emission factor model is 102.5 t, with a confidence interval of 71.7 to 162.1 t. The chlorine-based model addresses the influence of chlorine and reduces the uncertainties of mercury emission estimates.