Potentials of whole process control of heavy metals emissions from coal-fired power plants in China
Potentials of whole process control of heavy metals emissions from coal-fired power plants in China
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我国燃煤电厂重金属排放全过程控制潜力
DOI：
10.1016/j.jclepro.2015.05.008
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发表时间：
2016-02-15
影响因子：
11.1
通讯作者：
Zhou, Junrui
中科院分区：
文献类型：
--
作者：
Zhu, Chuanyong;Tian, Hezhong;Zhou, Junrui
近年来，我国重金属中毒事件不断发生，燃煤电厂是重金属人为排放的重要来源之一，其煤炭消耗量巨大（2012年约1785.3 Mt）。本文从全过程控制的概念出发，对我国CFPPs中不同控制措施的协同效应进行了评价，燃烧前洗煤+选择性催化还原（SCR）燃烧后净化+电除尘器/布袋除尘器（ESP/FFs）+湿法烟气脱硫（WFGD）的组合该配置被认为是目前和不久的将来CFPP的重金属减排的最佳可用控制技术。然而，特殊的汞控制技术在中国CFPP中的广泛应用是非常必要的。在此基础上，采用3种能源情景和3种控制情景对重金属排放的未来趋势进行了预测。在相同的控制情景下，2020年和2030年，能源节约和能源结构的变化将分别产生约24.1%和24.6%的重金属减排潜力。然而，在目前的能源消耗模式和空气污染控制政策下，SCR + SMC + ESP/FF + WFGD的安装将导致2020年和2030年的重金属排放量分别减少约21.0%-44.1%和36.3%-67.5%。最后，提出了综合控制建议，以尽量减少最终有毒重金属排放。(C)2015爱思唯尔有限公司版权所有。
Recently, more and more poisoning accidents associated with toxic heavy metals have been reported throughout China, coal-fired power plants (CFPPs) sector is regarded as one of the most important source categories of anthropogenic atmospheric releases of heavy metals due to tremendous annual coal consumption (about 1785.3 Mt in 2012). In this paper, with the concept of whole process control, the co-benefit or synergistic removal efficiencies of different control measures used in CFPPs of China are evaluated, the combination of coal washing before burning plus post combustion cleaning of selective catalytic reduction (SCR) + electrostatic precipitator/fabric filters (ESP/FFs) + wet flue gas desulfurization (WFGD) configuration is identified to be the best available control technology for heavy metals abatement of CFPPs at present and in the near future. However, the widely application of special mercury control (SMC) technologies in Chinese CFPPs in future is greatly needed. Furthermore, three energy scenarios and three control scenarios were assumed to forecast the future trend of heavy metals emissions. Under the same control scenario, the change of the energy saving and energy structure will give rise to about 24.1% and 24.6% of abatement potential for heavy metals in 2020 and 2030, respectively. Whereas, under the current energy consumption pattern and air pollution control policies, the installation of SCR + SMC + ESP/FFs + WFGD will result in about 21.0-44.1% and 36.3-67.5% of reduction for heavy metals emissions in 2020 and 2030, respectively. Finally, integrated control suggestions are proposed to minimize the final toxic heavy metals discharges. (C) 2015 Elsevier Ltd. All rights reserved.