외부 및 내부 확산을 적용한 인도네시아 석탄촤의 연소 반응율 분석

황찬원; 김량균; 류광일; 오택림; 전충환; Chan-Won Hwang; Ryang-Gyoon Kim; Kwang-Il Ryu; Ze-Lin Wu; Chung-Hwan Jeon

Korean Chemical Engineering Research, Vol.52, No.1, 133-140, February, 2014

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외부 및 내부 확산을 적용한 인도네시아 석탄촤의 연소 반응율 분석

Reaction Rate Analysis of Combustion for Indonesian Coal Char Applied by External/Internal Diffusion

황찬원, 김량균, 류광일, 오택림, 전충환^†

부산대학교 기계공학부 에너지변환시스템연구실/화력발전에너지 분석기술센터, 609-735 부산시 금정구 장전동 산 30

Chan-Won Hwang, Ryang-Gyoon Kim, Kwang-Il Ryu, Ze-Lin Wu, and Chung-Hwan Jeon^†

Energy Conversion System Lab / Pusan Clean Coal Center, Department of Mechanical Engineering, Pusan National University, San 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, Korea

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초록

본 연구의 목적은 국내 화력발전소에서 사용중인 인도네시아 석탄촤의 연소반응율을 연구하는 것이다. 석탄촤의 반응율은 External, Internal effectiveness factor를 고려하여 입자 내부 및 외부확산을 정량적으로 정리하였으며, Random pore model을 사용하여 탄소변환율에 따른 입자내부비표면적의 변화를 반영하였다. 가열 및 측정이 가능한 WHR(Wire Heating Reactor)를 활용하여 반응시간을 측정함으로써 석탄촤의 반응율을 도출하였고 BET(Brunauer-Emmett-Teller) 및 TGA(Thermo-Gravimetric Analysis) 장비를 활용하여 석탄촤의 물리적인 특성인 내부비표면적과 Random pore model 의 구조변수(ψ)를 측정하였다. 석탄 종에 따른 활성화에너지 및 빈도인자를 도출하기 위해 아역청탄인 BARAMULTI, ENERGYMAN, AGM탄을 사용하였다. 본 연구 결과에서 External, Internal effectiveness factors를 통해 확산에 따른 kinetics를 비교한 결과 외부 확산 보다 내부 확산의 영향이 지배적임을 확인하였다. 최종적으로 내부 및 외부 확산에 대한 영향을 고려한 3종의 석탄촤 Intrinsic kinetics의 활성화에너지는 110~118 kJ/mol의 값을 보였다.

The experiment was designed to compare the char combustion kinetics of pulverized Indonesia coals commonly utilized in Korea power plants. The reaction rate of coal char has been formulated using the external and internal effectiveness factors to describe the diffusion effect quantitatively. The Random Pore Model (RPM) was used for applying internal specific surface area as a function of carbon conversion ratio. Reaction rate was obtained from reaction time using the Wire Heating Reactor (WHR) which can heat and measure the char particle temperature at the same time. BET and TGA were used to obtain physical properties such as internal specific surface area and structural parameter. Three kinds of Indonesia Sub-bituminous coals “BARAMULTI, ENERGYMAN, AGM” were used in order to derive the activation energy and pre-exponential factor. The results of this study showed that the effect of internal diffusion than that of external diffusion is the dominant as comparison of kinetics was reflected in external and internal effectiveness factors. For three kinds of coal char, finally, activation energy of intrinsic kinetics indicates 110~118 kJ/mol.

Keywords:Coal Char;Reaction Rate;Kinetics;WHR;RPM

[References]

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[1] Kim YG, Kim JD, Kim GB, Song JH, Jeon CH, KSME(B),, 34, 259 (2010)

[2] Kim RG, Song JH, Lee BH, Chang YJ, Jeon CH, Korean Chem. Eng. Res., 48(1), 110 (2010)

[3] Ryu KI, Kim RG, Li DF, Wu ZL, Jeon CH, Korean Chem. Eng. Res., 51(1), 121 (2013)

[4] Lee BH, Song JH, Lee CS, Chang YJ, Jeon CH, KSME(B), 33(10), 737 (2009)

[5] Lee BH, Song JH, Kang KT, Chang YJ, Jeon CH, KSME(B), 33, 876 (2009)

[6] Tomeczek J, “Coal Combustion,” Malabar, FL, Krieger Publishing Company (1994)

[7] Kwon JS, Kim RG, Song JH, Chang YJ, Jeon C H, Tomeczek, J., “Coal Combustion,” Malabar, FL, Krieger Publishing, 20, 346 (2011)

[8] Gong XZ, Guo ZC, Wang Z, Combust. Flame, 157(2), 351 (2010)

[9] Normand ML, Prog. Energy Combust. Sci., 4(4), 221 (1978)

[10] Rodjeen SN, Mekasut LS, Kuchontara PP, Piumsomboon PP, Korean J. Chem. Eng., 23(2), 216 (2006)

[11] Kalyan A, Ishwar KP, “Combustion Science and Engineering,” CRC Press/Taylor&Francis (1959)

[12] Mittchell RE, “On the Products of the Heterogeneous Oxidation Reaction at the Surfaces of Burning Coal Char Particles,” Twenty-Second Symposium(International) on Combustion Combust. Inst., 69-78 (1988)

[13] Williams A, Pourkashanian M, Jones JM, Combustion Institute, 28, 2141 (2000)

[14] Williams A, Backreedy R, Habib R, Jones JM, Pourkashanian M, Fuel, 81(5), 605 (2002)

[15] Smith IW, “The Combustion Rates of Coal Chars: A Review,” 19th Symposium(International) on Combustion Combust. Inst., 1045-1065 (1982)

[16] Baum MM, Street PJ, Combust. Sci. Tech., 3(5), 231 (1971)

[17] Field MA, Combust. Flame, 13, 237 (1969)

[18] Mitchell RE, Combustion Institute, 28, 2261 (2000)

[19] Monaghan RFD, Ghoniem AF, Fuel, 91(1), 61 (2012)

[20] Liu GS, Tate AG, Bryant GW, Wall TF, Fuel, 79, 1145 (2000)

[21] Stephen, R. T., “An Introduction to Combustion,” McGraw-Hill Book Co. (2000)

[22] Tomeczek J, Wojcik J, “A Method of Direct Measurement of Solid Fuel Particle Ignition Temperature,” Twenty-third Symposium(International) on Combustion Combust. Inst., 1163- 1167 (1990)