Behavior of thallium in pulverized coal utility boiler installations in Southwest China.

Journal of the Air & Waste Management Association
Zhonggen LiXinbin Feng

Abstract

Thallium (Tl) is a toxic element that exists in coal at trace level. Coal-fired power plants (CFPPs) consume large amounts of coal and can potentially release this element into surrounding environment. However, knowledge of fates of Tl inside CFPPs and associated atmospheric emissions is still very limited. In this study, five CFPPs with pulverized coal boilers (PC) in Guizhou province, southwest China, were selected for investigation. All input and output solid materials and the stack flue gas samples were collected simultaneously. Tl concentrations in feed coal (0.10-0.34 mg·kg-1) of the five CFPPS were only a third to one half of the national average value. Tl concentrations were obviously higher in fly ash (0.39-1.13 mg·kg-1) than in bottom ash (0.09-0.25 mg·kg-1), indicating notable redistribution of Tl during coal combustion. Tl concentrations were low in limestone (0.01-0.02 mg·kg-1), flue gas desulfurization gypsum (0.01-0.03 mg·kg-1), and the stack flue gas (0.006-0.011 μg·Nm-3). Most Tl inside these CFPPs was captured by electrostatic precipitator or electrostatic precipitator-fabric filter (ESP/ESP-FF) fly ash (88.66%-97.44%), followed by bottom ash (2.13%-10.73%), gypsum (<3.89%), and stack emissions (0.01%-0.05%). ...Continue Reading

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