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Technology for the Preparation of Ash-free Coal from Low Rank Coal(LRC)  

Lee, Sihyun (Clean Coal Technology Research Center, Climate Change Technology Research Division, Korea Institute of Energy Research)
Kim, Sangdo (Clean Coal Technology Research Center, Climate Change Technology Research Division, Korea Institute of Energy Research)
Publication Information
Korean Chemical Engineering Research / v.46, no.3, 2008 , pp. 443-450 More about this Journal
Abstract
Efficient use of low rank coals (LRC) have been investigated as a method to cope with recent high oil price. Among the coals used in industry, lignite and sub-bituminous coals are belong to the LRC, and have abundant deposit and are distributed worldwide, but high moisture contents and self ignition properties inhibits their utilization. In this paper, chemical coal cleaning to produce ash-free coal from LRC has been investigated. Two technologies, that is, UCC(Ultra Clean Coal) process removing ash from coal and Hyper Coal process extracting combustibles from coal were compared with. UCC process has merits of simple and reliable when it compared with Hyper Coal process, but the remaining ash contents werehigher than Hyper Coal. Hyper Coal has ash contents under the 200ppm when raw coal is treated with appropriate solvent and ion exchange materials to remove alkali materials in extracted solution. The ash-free coal which is similar grade with oil can be used as alternate oil in the industry, and also used as a high grade fuel for IGCC, IGFC and other advanced combustion technology.
Keywords
Hyper Coal; Ultra Clean Coal; Alkali Leaching; Solvent Extraction; Ash-free Coal;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 Opaprakasit, P., "Interaction and the Structure of Coal," Ph.D. Dissertation, The Pennsylvania State University, Troy, New York (2003)
2 Eliot, R. C., "Coal Desulfurization Prior to Combustion," Noyes Data Corporation, Park Ridge, New Jersey, 33-51(1978)
3 Meyers, R. A., "Gravimelt Process Application and Economics," 1st International Pittsburgh Coal Conference, Pittsburgh, PA(1984)
4 Meyers, R. A., Hart, W. D., Jones, J. F., McClanathan, L. C., Anastasi, J. L. and Barrish, E. M., "Gravimelt Process Modular Circuit Test Results," 3rd International Pittsburgh Coal Conference, Pittsburgh, PA(1986)
5 "UCC Energy," http://www.uccenrgy.com.au (2007)
6 Steel, K. M., Besida, J., O'Donnell, T. A. and Wood, D. G., "Production of Ultra Clean Coal Part I - Dissolution Behavior of Mineral Matter in Black Coal Toward Hydrochloric and Hydrofluoric Acid," Fuel Process. Technol., 70, 171-192(2001)   DOI   ScienceOn
7 Steel, K. M., Besida, J., O'Donnell, T. A. and Wood, D. G., "Production of Ultra Clean Coal Part III - Effect of Coal's carbonaceous Matrix on the Dissolution of Mineral Matter Using Hydrofluoric Acid," Fuel Process. Technol., 76, 51-59(2002)   DOI   ScienceOn
8 "Carbon Products," http://www.carbonxt.com/tech.html (2004)
9 Okuyama, N., Komatsu, N., Shigehisa, T., Kaneko, T. and Tsuruya, S., "Hyper-Coal Process to Produce the Ash-Free Coal," Fuel Process. Technol., 85, 947-967(2004)   DOI   ScienceOn
10 Yoshida, T., Takanohashi, T., Sakanishi, K., Saito, I., Fujita, M. and Mashimo, K., "The Effect of Extraction Condition on 'HyperCoal' Production (1) - Under Room-Temperature Filtratio," Fuel, 81, 1463-1469(2002)   DOI   ScienceOn
11 Yoshida, T., Li, C., Takanohashi, T., Matsumura, A., Sato, S. and Saito, I., "The Effect of Extraction Condition on 'HyperCoal' Production (2) - Effect of Polar Solvents Under Hot Filtration," Fuel Process. Technol., 86, 61-72(2004)   DOI   ScienceOn
12 Li, C., Takanohashi, T., Yoshida, T., Saito, I., Aoki, H., Mashimo, K., "Effect of Acid Treatment on Thermal Extraction Yield in Ashless Coal Production," Fuel, 83, 727-732(2004)   DOI   ScienceOn
13 Lee, S. H. and Shon, E. K., "Changes in Combustion Characteristics of Coals after Treatment with Molten Caustic Leaching," HWAHAK KONGHAK, 32(3), 376-384(1994)
14 Lee, S. H., Kim, S. D., Woo, K. J., Jeong, S. K. and Rhim, Y. J., "Ash-Less Coal Preparation by Using Solvent Extraction," 24th International Pittsburgh Coal Conference, September, Johannesburg, South Africa(2007)
15 "Coal Utilization Technology," http://www.jcoal.or.jp/overview_ en/gijutsu.html, JCOAL(2005)
16 Khoury, D. L., "Coal Cleaning Technology," Noyes Data Corporation, Park Ridge, New Jersey(1981)
17 Takanohashi, T., "Production and Utilization Technology of Hypercoal (ash-fre coal)," Seminar at ETRI, October, 29(2006)
18 Smouse, S., "Asia Pacific Partnership on Clean Development and Climate Action Plan," APP CFE Task Force Meeting, July, Beijing(2007)
19 Saito, I., "Current Status and Perspective of Research and Development on Coal Utilization Technology in Japan," 20th International Pittsburgh Coal Conference, September, Pittsburgh, PA(2003)
20 Tsai, S. C., "Fundamentals of Coal Beneficiation and Utilization," Elsevier Scientific Publishing Co., New York(1982)
21 Paul, B., Bruce, W. A., Norman, C. K. and Brian, W. S., "Process for Demineralizing Coal," International Patent No. WO 2004/039927 A1(2004)
22 Chriswell, C. D. and Markuszewski, R., "Improved Molten Caustic Leaching of Coals by Two-stage Leaching," 8th International Pittsburgh Coal Conference, Pittsburgh, PA(1991)
23 Ryu, H. W., Chang, Y. K. and Kim, S. D., "Microbial Desulfurization of Coals by Sulfur Oxidizing Bacteria Thiobacillus Ferrooxidans," HWAHAK KONGHAK, 31(3), 325-332(1993)
24 Lagley, J., "Ultra Clean Coal," APP CFE Task Force Meeting, July, Beijing(2007)
25 Steel, K. M., Besida, J., O'Donnell, T. A. and Wood, D. G., "Production of Ultra Clean Coal Part II - Ionic Equilibria in Solution When Mineral Matter from Black Coal is Treated with Aqueous Hydrofluoric Acid," Fuel Process. Technol., 70, 193-219(2001)   DOI   ScienceOn
26 Miura, K., Shimada, M., Mae, K. and Sock, H.Y., "Extraction of Coal Below $350^{\circ}C$ in Flowing Non-Polar Solvent," Fuel, 80, 1573-1582(2001)   DOI   ScienceOn
27 Lee, S. H., Shon, E. K. and Park, S. W., "Changes in Organic Structure of Coals after Treatment with Mo;lten Caustic leaching," HWAHAK KONGHAK, 33(6), 675-683(1995)
28 Lee, S. H. and Shon, E. K., "Effect of Molten Caustic Leaching on the Combustion Characteristics of Anthracite," Fuel, 76(3), 241-246(1997)   DOI   ScienceOn
29 Lee, S. H., "Utilization of Abroad Resources; Lignite," ETIS, 26, 39-52(2005)
30 Benson, S. A., Jones, M. L. and Harb, J. N., in L. D. Smmot (Ed.), Fundamentals of Coal Combustion, Elsevier, Amsterdam, 299-373(1993)
31 Sakanishi, K., Saito, I., Ishom, F., Watanabe, I., Mochida, I., Okuyama, N., Deguchi, T. and Simazaki, K., "Characterization and Elution Behaviors of Organically Associated Minerals in Coals During Acid Treatment and Solvent Extraction," Fuel, 81, 1471-1475(2002)   DOI   ScienceOn
32 Steel, K. M. and Patrick, J. W., "The production of Ultra Clean Coal by Chemical Demineralization," Fuel, 80, 2019-2023(2001)   DOI   ScienceOn
33 Biomass Co-firing - An Efficient Ways to Reduce Greenhouse Gas Emissions, European Bioenergy Networks, Bioenergy 2003, September, Finland(2003)
34 Shimizu, K., Saito, I., Shimamura, K. and Suganuma, A., "Desulfurization and Solubilization High-sulfur Coal by Superacid HF/BF3," Energy & Fuel, 12, 734-739(1998)   DOI   ScienceOn
35 Kim, S. D., Woo, K. J., Jeong, S. K., Rhim, Y. J. and Lee, S. H., "Production of Low Ash Coal from LRC(low rank coals) by Thermal Extraction with NMP(N-methyl-2-pyrrolidinone)," Korean Korean. J. of Chem. Eng., 25(4), in press(2008)   DOI   ScienceOn