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Received July 16, 2016
Accepted December 17, 2016
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Impact of co-firing lean coal on NOX emission of a large-scale pulverized coal-fired utility boiler during partial load operation
School of Energy and Environment, Southeast University, Nanjing 210096, P. R. China 1State Grid Jiangsu Electric Power Company Research Institute, Nanjing 211103, P. R. China
c.d.sheng@seu.edu.cn
Korean Journal of Chemical Engineering, April 2017, 34(4), 1273-1280(8)
https://doi.org/10.1007/s11814-016-0352-7
https://doi.org/10.1007/s11814-016-0352-7
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Abstract
The present work aimed at combustion optimization of a 1,000MW tower-type ultra-supercritical boiler co-firing a lean coal with bituminous coals for reducing NOX emission particularly at low load operations. Historic operation data were systematically analyzed to investigate the characteristics of NOX emission. Through comparing between lean coal co-firing and sole bituminous coal firing, it was confirmed that, besides the big difference in quality and combustion characteristics of the lean coal from the bituminous coals, the excess air ratio in main combustion zone had a significant effect on NOX emission. Keeping the ratio at properly lower level achieved lower NOX emissions at low load operations. Based on the analyses, in-situ tests successfully brought NOX emissions of co-firing down close to 300mg/m3 at the load of 700MW, demonstrating the effectiveness of combustion optimization for controlling NOX emissions at partial load operation of co-firing.
Keywords
References
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Ma Z, Deng J, Li Z, Li Q, Zhao P, Wang L, Sun Y, Zheng H, Pan L, Zhao S, Jiang J, Wang S, Duan L, Atmos. Environ., 131, 164 (2016)
Li S, Chen Z, He E, Jiang B, Li Z, Wang Q, Appl. Therm. Eng., 110, 223 (2017)
Shi L, Fu Z, Duan X, Cheng C, Shen Y, Liu B, Wang R, Appl. Therm. Eng., 98, 766 (2016)
Tan P, Xia J, Zhang C, Fang QY, Chen G, Energy, 94, 672 (2016)
Zhang XH, Zhou J, Sun SZ, Sun R, Qin M, Fuel, 142, 215 (2015)
Liu H, Xin N, Cao Q, Sha L, Sun D, Wu S, Korean J. Chem. Eng., 26(4), 1137 (2009)
Liu YC, Fan WD, Li Y, Appl. Energy, 177, 323 (2016)
Spliethoff H, Greul U, Rudiger H, Hein KRG, Fuel, 75(5), 560 (1996)
Liang ZY, Ma XQ, Lin H, Tang YT, Appl. Energy, 88(4), 1120 (2011)
Wei ZB, Li XL, Xu LJ, Cheng YT, Energy, 55, 683 (2013)
Dal Secco S, Juan O, Louis-Louisy M, Lucas JY, Plion P, Porcheron L, Fuel, 158, 672 (2015)
Javed MT, Irfan N, Gibbs BM, J. Environ. Manage., 83, 251 (2007)
Nalbandian H, NOX control for coal-fired plant, IEA Clean Coal Centre Report CCC/157 (2009).
Kim W, Lee DJ, Park SW, J. Mech. Sci. Technol., 25, 901 (2011)
van der Lans RP, Glarborg P, Dam-Johansen K, Prog. Energy Combust. Sci., 23(4), 349 (1997)
Ahmed F, Cho HJ, Kim JK, Seong NU, Yeo YK, Korean J. Chem. Eng., 32(6), 1029 (2015)
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Yang JH, Kim JEA, Hong J, Kim M, Ryu C, Kim YJ, Park HY, Baek SH, Fuel, 144, 145 (2015)
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