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Mercury speciation and removal across full-scale wet fgd systems at coal-fired power plants

Journal of Coal Science & Engineering(China) 2010年第1期16卷 82-87页

作者： WU Cheng-li CAO Yan DONG Zhong-bing CHENG Chin-min LI Han-xu PAN Wei-ping School of Chemical Engineering Anhui University of Science and Technology Huainan 232001 China Institute for Combustion Science and Environmental Technology Western Kentucky University Bowling Green 42101 USA

The Ontario Hydro Method （OHM） recommended by the United States Environmental Protection Agency （EPA） was used to determine mercury speciation in the combustion flue gas across wet fgd systems. Four coal-fired units with wet fgd systems were chosen to evaluate mercury speciation and mercury removal efficiencies through these wet fgd systems. Chlorine content in coal had been suggested as a main factor that affects mercury speciation in flue gas. It is shown that the higher the chlorine concentration in coal is, the higher the percentage of oxidized mercury （Hg2＋） is removed in wet fgd systems, which can increase overall mercury removal efficiencies through wet fgd systems. The selective catalyst reduction （SCR） system has a function of oxidizing ele- mental mercury （Hg0） to oxidized mercury. A higher percentage of oxidized mercury in the total vapor mercury at the fgd inlet is observed when SCR is in service. Therefore, higher overall mercury removal efficiencies through wet fgd are attained. Because of different wet fgd operating conditions, there are different mercury removal efficiencies in different units. Elemental mercury reemission took place when a fraction of oxidized mercury absorbed in the slurry is reduced to elemental mercury, and Hg2＋ is reemitted from stack, which results in decreases in mercury removal efficiencies through wet fgd systems.

关键词： wet fgd mercury speciation mercury removal field testing

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A pilot-scale jet bubbling reactor for wet flue gas desulfurization with pyrolusite

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Journal of Environmental Sciences 2005年第5期17卷 827-831页

作者： SU Shi-jun ZHU Xiao-fan LIU Yong-jun JIANG Wen-ju JIN Yan National Engineering Research Center for Flue Gas Desulfurization Department of Environmental Science and Engineering Sichuan University Chengdu 610065 China

MnO2 in pyrolusite can react with SO2 in flue gas and obtain by-product MnSO4· H2O. A pilot scale jet bubbling reactor was applied in this work. Different factors affecting both SO2 absorption efficiency and Mn2^＋ extraction rate have been investigated, these factors include temperature of inlet gas flue, ration of liquid/solid mass flow rate（ L/S）, pyrolusite grade, and SO2 concentration in the inlet flue gas. In the meantime, the procedure of purification of absorption liquid was also discussed. Experiment results indicated that the increase of temperature from 30 to 70 K caused the increase of SO2 absorption efficiency from 81.4% to 91.2%. And when SO2 concentration in the inlet flue gas increased from 500 to 3000 ppm, SO2 absorption efficiency and Mn2^＋ extraction rate decreased from 98.1% to 82.2% and from 82.8% to 61.7%, respectively. The content of MnO2 in pyrolusite had a neglectable effect on SO2, absorption efficiency. Low L/S was good for both removal of SO2 and Mn2^＋ extraction. The absorption liquid was filtrated and purified to remove Si, Mg, Ca, Fe, Al and heavy metals, last product MnSO4· H2O was obtained which quality could reach China GB1622-86, the industry grade standards.

关键词： wet fgd jet bubbling reactor SO2 pyrolusite manganese sulfate

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