Articles & Issues
- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
-
This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright © KIChE. All rights reserved.
All issues
가압유동층 석탄연소로에서 압력이 연소특성에 미치는 영향
Effect of Pressure on the Combustion Characteristics in a Press- urized Fluidized Bed Coal Combustor
HWAHAK KONGHAK, October 1996, 34(5), 619-628(10), NONE
Download PDF
Abstract
시스템의 공정변수를 예측할 수 있는 가압하의 유동층 석탄연소로의 모델을 전개하였으며 본 모델을 사용하여 반응기 압력의 변화에 따른 시스템의 성능(탄소연소효율, 층내 탄소분율, 생성가스의 조성)을 넓은 범위에 걸쳐 분석하였다. Gel-dart B군에 속하는 석탄연소로 기포유동층의 거동은 압력의 변화에 의해 거의 바뀌지 않았다. 높은 유속 및 낮은 층온도의 조건에서 가압에 의한 효율의 이득이 크게 나타났으며 700℃의 층온도 조건에서는 15atm으로 가압함으로써 약 5%의 효율을 증가시킬 수 있다. 가압을 하면 산소의 농도증가로 탄소연소효율이 증대되지만 층내 탄소함량은 압력에 따라 2배 미만의 범위에서 증가하였다.
The effect of system pressure on the performance of a pressurized fluidized bed coal combustor(carbon combustion efficiency, bed carbon loading, gaseous concentration profile) has been studied by a PFBC model. The behavior of bubbling bed of Geldart B group does not change by pressurization. The more increase in the carbon combustion efficiency can be obtained by pressurization at conditions of the lower temperature and higher gas velocities. At the bed temperature of 700℃, 5% increase in the carbon efficiency can be obtained with 15 atm. The carbon efficiency increases due to larger oxygen concen- tration, whereas the bed carbon loading also slightly increases with an in- crease in system pressure.
Keywords
References
Choi JH, Ph.D. Thesis, KAIST, Seoul, Korea (1989)
Gibbs BM, Inst. Fuel. Symp. Ser., 1(A5.1), 10 (1975)
Arena U, D'Amore M, Massimilla L, AIChE J., 29, 40 (1983)
Chirone R, D'Amore M, Massimilla L, AIChE J., 31, 812 (1985)
Rajan RR, Wen CY, AIChE J., 26, 642 (1980)
Horio M, Wen CY, AIChE Symp. Ser., 74(176), 101 (1978)
Chen TP, Saxena SC, AIChE Symp. Ser., 74(176), 149 (1978)
Wells JW, Byrd JR, Krishnan RP, Proc. 7th Int. Conf. on FBC, I, 284-294 (1982)
Overturf BW, Reklaitis GV, AIChE J., 29(5), 813 (1983)
Horio M, Shibata T, Kadoguchi K, Muchi I, "Behavior of Entrained Particles in the Freeboard," Proc. 2nd China japan Symp., edited by Kwauk, M. and Kunii, D., 124-135 (1985)
Park D, Levenspiel O, Fuel, 61, 578 (1982)
Degang R, Baosheng J, Mingyao Z, "A Coal Combustion Model in Pressurized Fluidized Bed," Fluidized Bed Combusion, ASME, pp. 1177-1181 (1991)
Miccio M, Nastri V, Poletto M, "The Effect of System Pressure on Char Combustion in Fluidized Beds: Model Predictions," Fluidized Bed Combustion, ASME, pp. 1233-1243 (1991)
Wen CY, Yu YH, AIChE J., 12, 610 (1966)
Mori S, Wen CY, AIChE J., 21, 109 (1975)
Davidson JF, Harrison RD, "Fluidized Particles," Cambridge Univ. Press (1963)
Kunii D, Levenspiel O, "Fluidization Engineering," 2nd ed., Chap. 6, Boston, Butterworth-Heinemann (1991)
Kobayashi H, Arai F, Sunagawa T, Kag. Kog., 31, 239 (1967)
Haider A, Levenspiel O, Powder Technol., 58, 63 (1989)
Merrick D, Highley J, AIChE Symp. Ser., 70(137), 366 (1974)
Field MA, Gill DN, Morgan BB, Hawkseley PGW, "Combustion of Pulverized Coal," British Coal Utilization Research Association, Leatherhead, Chenev and Sons Ltd. Banbury (1967)
Ross IB, Davidson JF, Trans. I. Chem. E., 60, 108 (1981)
Arthur JR, Trans. Faraday Soc., 47, 164 (1951)
LaNauze RD, Chem. Eng. Res. Des., 63(1), 3 (1985)
Shiao SY, Warchol JJ, Botros PE, "Coal Devolatization and Char Oxidation under Simulated PFBC Conditions," Fluidized Bed Combustion, ASME, pp. 1183-1190 (1991)
Wallman PH, Carlsson RCJ, "Fluidized Bed Combustion Kinetics at Elevated Pressures," Fluidized Bed Combustion, ASME, pp. 1517-1522 (1991)
Howard JB, Williams GC, Fine DB, Proc. 14th Int. Symp. on Combustion, The Combustion Institute, Pittsburgh, pp. 975-985 (1973)
Hoffmann AC, Yates JG, Chem. Eng. Commun., 41, 133 (1986)
Kunii D, Levenspiel O, Ind. Eng. Chem. Res., 29, 1226 (1990)
Adanez J, Abanades JC, Ind. Eng. Chem. Res., 31, 2286 (1992)
Gibbs BM, Inst. Fuel. Symp. Ser., 1(A5.1), 10 (1975)
Arena U, D'Amore M, Massimilla L, AIChE J., 29, 40 (1983)
Chirone R, D'Amore M, Massimilla L, AIChE J., 31, 812 (1985)
Rajan RR, Wen CY, AIChE J., 26, 642 (1980)
Horio M, Wen CY, AIChE Symp. Ser., 74(176), 101 (1978)
Chen TP, Saxena SC, AIChE Symp. Ser., 74(176), 149 (1978)
Wells JW, Byrd JR, Krishnan RP, Proc. 7th Int. Conf. on FBC, I, 284-294 (1982)
Overturf BW, Reklaitis GV, AIChE J., 29(5), 813 (1983)
Horio M, Shibata T, Kadoguchi K, Muchi I, "Behavior of Entrained Particles in the Freeboard," Proc. 2nd China japan Symp., edited by Kwauk, M. and Kunii, D., 124-135 (1985)
Park D, Levenspiel O, Fuel, 61, 578 (1982)
Degang R, Baosheng J, Mingyao Z, "A Coal Combustion Model in Pressurized Fluidized Bed," Fluidized Bed Combusion, ASME, pp. 1177-1181 (1991)
Miccio M, Nastri V, Poletto M, "The Effect of System Pressure on Char Combustion in Fluidized Beds: Model Predictions," Fluidized Bed Combustion, ASME, pp. 1233-1243 (1991)
Wen CY, Yu YH, AIChE J., 12, 610 (1966)
Mori S, Wen CY, AIChE J., 21, 109 (1975)
Davidson JF, Harrison RD, "Fluidized Particles," Cambridge Univ. Press (1963)
Kunii D, Levenspiel O, "Fluidization Engineering," 2nd ed., Chap. 6, Boston, Butterworth-Heinemann (1991)
Kobayashi H, Arai F, Sunagawa T, Kag. Kog., 31, 239 (1967)
Haider A, Levenspiel O, Powder Technol., 58, 63 (1989)
Merrick D, Highley J, AIChE Symp. Ser., 70(137), 366 (1974)
Field MA, Gill DN, Morgan BB, Hawkseley PGW, "Combustion of Pulverized Coal," British Coal Utilization Research Association, Leatherhead, Chenev and Sons Ltd. Banbury (1967)
Ross IB, Davidson JF, Trans. I. Chem. E., 60, 108 (1981)
Arthur JR, Trans. Faraday Soc., 47, 164 (1951)
LaNauze RD, Chem. Eng. Res. Des., 63(1), 3 (1985)
Shiao SY, Warchol JJ, Botros PE, "Coal Devolatization and Char Oxidation under Simulated PFBC Conditions," Fluidized Bed Combustion, ASME, pp. 1183-1190 (1991)
Wallman PH, Carlsson RCJ, "Fluidized Bed Combustion Kinetics at Elevated Pressures," Fluidized Bed Combustion, ASME, pp. 1517-1522 (1991)
Howard JB, Williams GC, Fine DB, Proc. 14th Int. Symp. on Combustion, The Combustion Institute, Pittsburgh, pp. 975-985 (1973)
Hoffmann AC, Yates JG, Chem. Eng. Commun., 41, 133 (1986)
Kunii D, Levenspiel O, Ind. Eng. Chem. Res., 29, 1226 (1990)
Adanez J, Abanades JC, Ind. Eng. Chem. Res., 31, 2286 (1992)
