Multi-method mercury specification from lignite-fired power plants

Ping Lu; Jiang Wu; Wei-ping Pan

Korean Journal of Chemical Engineering, Vol.26, No.2, 542-547, March, 2009

DOI10.1007/s11814-009-0092-z Export Citation

Multi-method mercury specification from lignite-fired power plants

Ping Lu^†, Jiang Wu¹, and Wei-ping Pan²

School of Power Engineering, Nanjing Normal University, Nanjing 210042, China
¹School of Energy & Environmental Engineering, Shanghai University of Electric Power, Shanghai 200090, China
²ICSET, Western Kentucky University, Bowling Green, KY 42101, USA

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Mercury concentration and speciation partitioning, including total mercury, elemental mercury and oxidized mercury from a lignite-fired power plant under different operating conditions, was studied by Ontario hydro method (OHM), two kinds of continuous mercury monitors (semi-continuous emission monitor (SCEM) and continuous mercury monitor (CMM)), and the sorbent trap method. The effects of boiler load, fuel blending ratio, electrostatic precipitator, flue gas desulphurization, flue gas bypassing the FGD ratio, and mercury measuring methods on mercury emission were analyzed. The results indicated that mercury data from OHM, SCEM and CMM presented a good consistency throughout the entire testing period within ±20% acceptable range; however, the results from Appendix K provided bigger discrepancies than the results of OHM and SCEM due to the interferences of higher selenium content in the flue gas. The particulate-bound mercury removal efficiencies of ESP were determined to be 16-35%. The percentages of elemental mercury emitted from two lignite-fired power plants were in the higher ranges of 43.9-74.2%.

Keywords:Mercury Emission;Lignite-fired PC Boiler;Hg Measuring Method;Field Testing

[References]

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[1] US EPA. Report 453/R-98-004a, A study of hazardous air pollutions from electric utility steam generating units: final report to congress (1998)

[2] US EPA Report 452/R-97-003, Mercury study report to congress (1997)

[3] Yan R, Liang DT, Tay JH, Environ. Sci. Pollut., 10, 399 (2003)

[4] US EPA, Clean air mercury rule, Available from: http://www.epa.gov/mercuryrule (2005)

[5] Yang X, Zhuo Y, Duan Y, Chen L, Yang L, Zhang L, Jiang Y, Xu X, Korean J. Chem. Eng., 24(4), 711 (2007)

[6] Galbreath KC, Zygarlicke CJ, Fuel Processing Tech., 65, 289 (2000)

[7] Kolker A, Senior CL, Quick JC, Applied Geochemistry, 21, 1821 (2006)

[8] Kellie S, Duan YF, Cao Y, Chu P, Mehta A, Carty R, Liu KL, Pan WP, Riley JT, Fuel Process. Technol., 85(6-7), 487 (2004)

[9] ASTM, Standard test method for elemental, oxidized, particlebound, and total mercury in flue gas generated from coal-fired stationary source (Ontario Hydro Method), Designation: D 6784-6702

[10] Laudal DL, MEC2 2ndIinternational expert’s workshop, Ottawa, Canada (2005)

[11] US EPA. Electronic code of federal regulations Title 40-Protection of environment, Part 75: Appendix K, Available from: http://ecfr. gpoaccess.gov/

[12] Yudovich YE, Ketris MP, International Journal of Coal Geology, 62, 135 (2005)