作者：HrideshAgarwalla,RabiNarayanSenapati,TaritBaranDas 单位：CoalMinerals&HeavyMetalResearchGroup,CSIR-CentralInstituteofMiningandFuelResearch 本文刊于： 《Journal of Environmental Sciences》 2021年第02期
关键词:
Coalcombustion Emission Mercury FluegasKeywords
Coal combustion, Emission, Mercury, Flue gas, Thermal power plant
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摘要
In India coal combustion is the single largest source of emission of mercury which is a widespread persistent global toxicant, travelling across international borders through air and water. As a party to the Minamata convention, India aims to monitor and reduce Hg emissions and stricter norms are introduced for mercury emissions from power plants(30 μg/Nm 3 for flue gas in stack). This paper presents the results obtained during the experimental studies performed on mercury emissions at four coal-fired and one lignite-fired power plants in India. The mercury concentration in the feed coal varied between 0.12–0.27 mg/Kg. In the mercury mass balance, significant proportion of feed coal mercury has been found to be associated with fly ash, whereas bottom ash contained very low mercury. 80%–90% of mercury was released to air through stack gas. However, for circulating fluidised bed boiler burning lignite, about 64.8% of feed mercury was found to get captured in the fly ash and only 32.4% was released to air. The mercury emission factor was found to lie in the range of 4.7–15.7 mg/GJ.
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