Factors Affecting Mercury Speciation in a 100-MW Coal-Fired Boiler with Low-NOx Burners

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• 作者：Shawn Kellie ; Yan Cao ; Yufeng Duan ; Lingchaun Li ; Paul Chu ; Arun Mehta ; Ron Carty ; John T. Riley ; and Wei-Ping Pan
• 刊名：Energy & Fuels
• 出版年：2005
• 出版时间：May 2005
• 年：2005
• 卷：19
• 期：3
• 页码：800 - 806
• 全文大小：185K
• 年卷期：v.19,no.3(May 2005)
• ISSN：1520-5029

文摘

The Western Kentucky University mobile laboratory for monitoring mercury emissionsmeasured the mercury levels in a 100-MW boiler with wall-fired low-NO_x burners. Mercuryemissions were monitored while burning seven coals, using semicontinuous emission monitoringat the air preheater outlet and electrostatic precipitator outlet. The collected data was then scaledand analyzed using stepwise regression analysis. The results showed that initial mercuryconcentration in the coal, as well as chlorine and sulfur levels, all influence the amount of mercuryemissions. After mercury content, chlorine had the major role in the levels of vapor-phase mercurypresent in the flue gas. Chlorine promotes the chemisorption of mercury onto fly ash. Sulfur wasshown to be a major factor in the oxidation of elemental mercury but inhibited the adsorption ofoxidized mercury onto the fly ash. Further experimental results suggest that both HCl and SO₂may participate directly in the mercury oxidation mechanism.