Browse > Article
http://dx.doi.org/10.9713/kcer.2017.55.4.548

Numerical Simulation on the Effects of Air Staging for Pulverized Coal Combustion in a Tangential-firing Boiler  

Kang, Kieseop (School of Mechanical Engineering, Sungkyunkwan University)
Ryu, Changkook (School of Mechanical Engineering, Sungkyunkwan University)
Publication Information
Korean Chemical Engineering Research / v.55, no.4, 2017 , pp. 548-555 More about this Journal
Abstract
This study investigated the influence of air staging on combustion and NOx emission in a tangential-firing boiler at a 560 MWe capacity. For air staging, the stoichiometric ratio (SR) for the burner zone was varied from 0.995 to 0.94 while the overall value was fixed at 1.2. The temperature and heat flux in the burner zone and upper furnace corresponded to the distribution of SR, while the total boiler efficiency remained similar. The NOx emission at the furnace exit was reduced by up to 20% when the SR in the burner zone decreased to 0.94. However, the amount of unburned carbon and slagging propensity was not noticeably influenced by the changes in the SR of the burner zone. Therefore, it was favorable to lower the SR of the burner zone for reduction of NOx emission.
Keywords
Tangential-firing boiler; Computational fluid dynamics; Air-staging combustion; NOx; Slagging;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
연도 인용수 순위
1 Seo, S. I., Park, H. Y. and Lee, S. N., "Computational Studies on the Combustion and Thermal Performance of the Coal Fired Utility Boiler : Temperature and Thermal Energy Distribution," Korean J. Air-Cond. Refrig. Eng., 21, 157-166(2009).
2 Okazaki, K. and Ando, T., "NOx Reduction Mechanism in Coal Combustion with Recycled $CO_2$," Energy., 22, 207-215(1997).   DOI
3 Man, C. K., Gibbins, J. R., Witkamp, J. G. and Zhang, J., "Coal Characterization for NOx Prediction in Air-Staged Combustion of Pulverized Coals," Fuel, 84, 1290-1295(2005).
4 Molina, A., Eddings, E. G., Pershing, D. W. and Sarofim, A. F., "Char Nitrogen Conversion: Implication to Emissions from Coal-Fired Utility Boilers," Prog. Energy Combust. Sci., 26, 507-531(2000).   DOI
5 Chae, J. O., Chun, Y. N. and Yi, U. Y., "A Study of NOx Reduction in Stage Combustion," Trans. Korean Soc. Mech. Eng. B, 17, 1556-1571(1993).
6 Jang, G. H., Chang, I. G., Jeoung, S. Y., Sun, C. Y. and Chon, M. H., "An Experiment Study on NOx Reduction in Pulverized Coal Combustion," Trans. Korean Soc. Mech. Eng. B, 1, 724-729(1999).
7 Yang, J., Sun, R, Sun, S., Zhao, N., Hao, N., Chen, H., Wang, Y., Guo, H. and Meng, J., "Experimental Study on NOx Reduction from Staging Combustion of High Volatile Pulverized Coals. Part 1. Air Staging," Fuel Process. Technol., 126, 266-275(2014).   DOI
8 Fan, W., Lin, Z., Kuang, J. and Li, Y., "Impact of Air Staging along Furnace Height on NOx Emissions from Pulverized Coal Combustion," Fuel Process. Technol., 91, 625-634(2010).   DOI
9 Jang, G. H., Chang, I. G., Sun, C. Y., Chon, M. H., and Yang, G. M., "Effect of Air Staging on NOx Reduction in Pulverized Coal Combustion," J. Korean Soc. Combust., 1, 149-154(1999).
10 Sung, Y. M., Moon, C. H, Eom, S. Y., Choi, G. M., and Kim. D. J., "Coal-particle Size Effects on NO Reduction and Burnout Characteristics with Air-staged Combustion in a Pulverized Coalfired Furnace," Fuel, 182, 558-567(2016).   DOI
11 Bris, T. L., Cadavid, F., Caillat, S., Pietrzyk, S., Blondin, J. and Baudoin, B., "Coal Combustion Modelling of Large Power Plant, for NOx Abatement," Fuel, 86, 2213-2220(2007).   DOI
12 Kang, K. T., Song, J. H., Yoon, M. J., Lee, B. H., Kim, S. M., Chang, Y. J. and Jeon, C. H., "A Numerical Study on the Effects of SOFA on NOx Emission Reduction in 500 MW Class Sub-bituminous Coal-fired Boiler," Trans. Korean Soc. Mech. Eng. B, 11, 858-868(2009).
13 Li, S., Xu, T., Hui, S., and Wei, X., "NOx Emission and Thermal Efficiency of a 300 MWe Utility Boiler Retrofitted by Air Staging," Appl. Energy., 86, 1797-1803(2009).   DOI
14 Diez, L. I., Corte, C., and Pallare, J., "Numerical Investigation of NOx Emissions from a Tangentially-fired Utility Boiler under Conventional and Over Fire Air Operation," Fuel, 87, 1259-1269(2008).   DOI
15 Seo, S. I., Park, H. Y., Kang, D. S. and Jeong, D. H., "Combustion Characteristics of Coal-Fired Boiler Depending on the Variations in Combustion Air Supply Method," Energy Eng. J., 19, 156-162(2010).
16 Yoon, M. J., Lee, B. H., Song, J. H., Kim, G. B., Chang, Y. J. and Jeon, C. H., "Numerical Study of the Optimization of Combustion and Emission Characteristics of Air-staged Combustion in a Pulverized Coal-fired Boiler," Trans. Korean Soc. Mech. Eng. B, 34, 587-597(2010).   DOI
17 Kokkinos, A., Wasyluk, D., Brower, M. and Barna, J. J., "Reducin NOx Emissions in Tangentially-Fired Boilers - A New Approach," ASME International Joint Power Generation Conference, 2000.
18 Lee, S. H., Park, S. C., Yim, Y. J. and Kim, H. T., "A Study on the Deposit Formation of Coal Ash," Korean Chem. Eng. Res., 34(1), 8-16(1996).
19 Lee, S. H., Lim, H., Kim, S. D. and Jeon, C. H., "A Study on Ash Fusibility Temperature of Domestic Thermal Coal Implementing Thermo-Mechanical Analysis," Korean Chem. Eng. Res., 52(2), 233-239(2014).   DOI
20 Barnes, D. I., "Slagging and Fouling in Coal-fired Boilers," CCC/147, IEA Clean Coal Centre, London UK, 43(2009).
21 Jung, B. J., "Sintering characteristics of Low-rank Coal Ashes," Korean J. Chem. Eng., 13(6), 633-639(1996).   DOI
22 Scott, D. H., "Ash Behaviour during Combustion and Gasification," Energy Fuels, 15, 502-502(2001).
23 Modlinski, N. J., "Computational Modeling of a Tangentially Fired Boiler with Deposit Formation Phenomena," Chem. Eng. J., 35, 361-368(2014).
24 Wang, H. and Harb, J., "Modeling of Ash Deposition in Large-scale Combustion Facilities Burning Pulverized Coal," Prog. Energy Combust. Sci., 23, 267-282(1997).   DOI
25 Srinivasachar, S., Helble, J., and Boni, A., "An Experimental Study of the Inertial Deposition of Ash under Coal Combustion Conditions," 23rd Symposium (International) on Combustion, 23, 1305-1312(1991).
26 Lee, B. H., Kim, S. I., Kim, S, M., Oh, D. H., Gupta, S. and Jeon, C. H., "Ash Deposition Characteristics of Moolarben Coal and its Blends during Coal Combustion," Korean J. Chem. Eng., 33(1), 147-153(2016).   DOI
27 Niksa, S., PC Coal Lab version 4.1: User Guide and Tutorial, Niksa Energy Associates LLC, Belmont, CA, United States, 1997.
28 Jones, W. P. and Lindstedt, R. P., "Global Reaction Schemes for Hydrocarbon Combustion," Combust Flame., 73, 233-249(1988).   DOI
29 Magnussen, B. F. and Hjertager, B. H., "On Mathematical Models of Turbulent Combustion with Special Emphasis on Soot Formation and Combustion," 16th Symposium (International) on Combustion., 16, 719-729(1976).
30 Wen, C. Y. and Chaung, T. Z., "Entrainment Coal Gasification Modeling," Ind. Eng. Chem. Process Des. Dev., 18, 684-695(1979).   DOI
31 Garba, M. U., Ingham, D. B., Ma, L., Degereji, M. U., Pourkashanian, M. and A, Williams, "Modelling of Deposit Formation and Sintering for the Co-combustion of Coal with Biomass," Fuel, 113, 863-872(2013).   DOI
32 Kalmanovitch, D. P. and Frank, M., "An Effective Model of Viscosity for Ash Deposition Phenomena," Proceedings of Mineral Matter and ash deposition from coal, United Engineering Trustees Inc Santa Barbara, 89-101(1988).
33 Srinivasachar, S., Senior, C. L., Helble, J. J. and Moore, J. W., "A Fundamental Approach to the Prediction of Coal Ash Deposit Formation in Combustion Systems," 16th Symposium (International) on Combustion, 1, 1179-1187(1992).