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http://dx.doi.org/10.5855/ENERGY.2015.24.4.089

The Study on the Combustion and Ash Deposition Characteristics of Ash Free Coal and Residue Coal in a Drop Tube Furnace  

Moon, Byeung Ho (Graduate School of Mechanical Engineering, Pusan Nat'l Univ.)
Kim, Jin Ho (Graduate School of Mechanical Engineering, Pusan Nat'l Univ.)
Sh, Lkhagvadorj (Graduate School of Mechanical Engineering, Pusan Nat'l Univ.)
Kim, Gyu Bo (Pusan Clean Coal Center, Pusan Nat'l Univ.)
Jeon, Chung Hwan (School of Mechanical Engineering, Pusan Nat'l Univ.)
Publication Information
Journal of Energy Engineering / v.24, no.4, 2015 , pp. 89-96 More about this Journal
Abstract
Recently, much research has been put into finding the causes and solutions of slagging/fouling problems that occur at the end of the boiler. This slagging/fouling, caused by low-rank coal's ash, disturbs the thermal power and greatly reduces efficiency. In environmental aspects, such as NOx pollution, governments have been implementing restrictions on the quantity of emission gases that can be released into the atmosphere. To solve these problems, research on Ash Free Coal (AFC), which eliminates ash from low-rank coal, is in progress. AFC has advantages over similar high-rank coals because it increases the heating value of the low grade coal, reduces the contaminants that are emitted, and decreases slagging/fouling problems. In this study, using a DTF, the changes of NOx emissions, unburned carbon, and the characteristics of ash deposition were identified. KCH raw coal, AFC extracted from KCH, residue coal, Glencore, and Mixed Coal (Glencore 85wt% and residue coal 15wt%) were studied. Results showed that AFC had a significantly lower emission of NOx compared to that of the raw coal and residue coal. Also, the residue coal showed a higher reactivity compared to raw coal. And finally, In the case of the residue coal and mixed coal, they showed a lower ash deposition than that of low-rank coal.
Keywords
Ash Free Coal; Unburnded carbon; NOx; Ash Deposition; DTF(Drop Tube Furnace);
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 Zhanhua Maa., Felicia Imana., Pisi Lua., Rod Searsa., Lingbu Kongb., A.S. Rokanuzzamanb., Donald P. McCollorb., Steven A. Bensonb., "A comprehensive slagging and fouling prediction tool for coal-fired boilers and its validation/application," Fuel Processing Technology, Vol. 88, 11-12, pp. 1035-1043, (2007)   DOI
2 Hirofumi, T., Hiromi, S., Hiromitsu M., and Priven, R., "Emission Characteristics NOx and Unburned Carbon in Fly Ash on High-Ash Coal Combustion," Fuel, Vol. 90, No. 2, pp. 850-853, (2011)   DOI
3 Kurose, R., Ikeda, M. and Makino, H., " Combustion Characteristics of High Ash Coal in a Pulverized Coal Combustion,", Fuel, Vol. 80, pp. 1447-1455, (2001)   DOI
4 Timothy, L. D., Sarofim, A.F., and Beer, M., "Characteristics of Single Particle Coal Combustion,", Ninteenth Symposium on Combustion, Vol.23, No.2, pp.1123-1130, (1982)
5 Kim, S.I., Lee, B.H. and An K.J., Kim M.C., Kim S.M., Jeon, C.H., "Effect of Ash Content on Unburned Carbon and NOx Emission in a Drop Tube Furnace," , Applied Energy, Vol. 38, No. 11 pp. 963-969, (2014)
6 Lee, B. H., Kim, S. G., Song, J. H., Chang, Y. J. and Jeon, C. H., "Influence of Coal Blending Methods on Unburned Carbon and NO Emissions in a Drop-tube Furnace,", Energy&Fuels, Vol. 25, pp. 5055-5062, (2011)
7 De Soete GG., Fifteenth Symposium (international) on Combution, The Combustion Institute, Pittsburgh, PA, p.1093, (1975)
8 Roderick M. Hatt., "Fireside deposits in coal-fired utility boilers," Energy & combustion, vol 16, pp. 235-241, (1990)   DOI
9 Wang, J., Fan, W., Li, Y., Xiao, M., Wang, K. and Ren, P., "The Effect of Air Staged Combustion on NOx Emissions in Dried Lignite Combustion,", Energy, Vol. 37, pp. 725-736, (2012)   DOI
10 I. Panagiotidis., K. Vafiadis., A.tourlidakis., and A. Tomboulides., "Study of slagging and fouling mechanisms in a lignite-fired power plant,", Applied Thermal Engineering, Vol. 74, pp. 156-164, (2014)