화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Chemical Engineering Research, Vol.49, No.3, 372-380, June, 2011
Export Citation
가스분석을 이용한 석탄 입자크기가 촤-CO2 가스화 반응성에 미치는 영향 연구
The Effect of Coal Particle Size on Char-CO2 Gasification Reactivity by Gas Analysis
김용택, 서동균1, 황정호2, †
  • 한국서부발전(주) 연세대학교 대학원 청정공학협동과정, 135-791 서울시 강남구 삼성동 167
  • 1연세대학교 기계공학과, 120-749 서울시 서대문구 신촌동 134
  • 2연세대학교 기계공학과 및 청정공학협동과정, 120-749 서울시 서대문구 신촌동 134
Yong Tack Kim, Dong Kyun Seo1, and Jungho Hwang2, †
  • Korea Western Power Co., Ltd., 167 Samsung-dong, Kangnam-gu, Seoul 135-791, Korea
  • 1Department of Mechanical Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Korea
  • 2School of Mechanical Engineering and Clean Technology, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Korea
E-mail:
초록
촤-가스화 반응은 반응온도, 반응가스 부분압력, 시스템 총 압력, 입자크기 등 운전조건뿐만 아니라 촤의 화학적 조성 및 물리적 구조의 영향을 받는다. 본 연구에서는 두 종류의 역청탄 촤를 이용하여 반응온도 1,000~1,400 ℃ 에서 CO2 가스화시 입자크기의 영향을 관찰하였다. 실험실 규모의 고정식 반응기를 이용하여 대기압 하에서 실험을 수행하였으며 반응가스인 CO2(40 vol%)가 반응기에 공급되면 촤와 반응하여 CO를 생성하였다. 촤의 탄소 전환율을 측정하기 위하여 비분산적외선 방식의 CO/CO2 센서가 장착된 실시간 가스분석기를 이용하였다. 실험결과 동일한 온도에서 입자크기가 감소할수록 가스화 반응성은 증가하였으며 온도가 증가할수록 반응성에 미치는 입자크기의 영향은 더욱더 크게 증가하였다. 또한 반응성이 낮은 촤에서 입자크기의 영향은 다소 적게 나타났다. 입자크기와 석탄 종류는 반응모 델에도 영향을 주었다. Shrinking core model은 반응성이 낮은 석탄을 잘 묘사했으며 반대로 Volume reaction model은 반응성이 높은 석탄을 잘 묘사하였다.
Char gasification is affected by operating conditions such as reaction temperature, reactants gas partial pressure, total system pressure and particle size in addition to chemical composition and physical structure of char. The aim of the present work was to characterize the effect of coal particle size on CO2 gasification of chars prepared from two different types of bituminous coals at different reaction temperatures(1,000~1,400 ℃). Lab scale experiments were carried out at atmospheric pressure in a fixed reactor where heat was supplied into a sample of char particles. When a flow of CO2(40 vol%) was delivered into the reactor, the char reacted with CO2 and was transformed into CO. Carbon conversion of the char was measured using a real time gas analyzer having NDIR CO/CO2 sensor. The results showed that the gasification reactivity increased as the particle size decreased for a given temperature. The sensitivity of the reactivity to particle size became higher as the temperature increases. The size effects became remarkably prominent at higher temperatures and became a little prominent for lower reactivity coal. The particle size and coal type also affected reaction models. The shrinking core model described better for lower reactivity coal, whereas the volume reaction model described better for higher reactivity coal.
Keywords:Coal Gasification;Particle Size;Kinetic Model;CO2 Gasification;Volume Reaction Model;Shrinking Core Model
  1. Ahn DH, Gibbs BM, Ko KH, Kim JJ, Fuel., “Gasification Kinetics of an Indonesian Sub-bituminous Coal-char with CO2 at Elevated Pressure", 80, 1651 (2001)
  2. Kajitani S, Hara S, Matsuda H, Fuel., “Gasification Rate Analysis of Coal Char with a Pressurized Drop Tube Furnace", 81, 539 (2002)
  3. Ochoa J, Cassanello MC, Bonelli PR, Cukierman AL, Fuel Process. Technol., “CO2 Gasification of Argentinean Coal Chars: a Kinetic Characterization", 74(3), 161 (2001)
  4. Liu G, Tate AG, Bryant GW, Wall TF, Fuel., “Mathematical Modeling of Coal Char Reactivity with CO2 at High Pressures and Temperatures", 79, 1145 (2000)
  5. Kajitani S, Suzuki N, Ashizawa M, Hara S, Fuel., “CO2 Gasification Rate Analysis of Coal Char in Entrained Flow Coal Gasifier", 85, 163 (2006)
  6. Schmal M, Monteiro JLF, Toscani H, Ind. Eng. Chem. Process Des. Dev., “Gasification of High Ash Content Coals with Steam in a Semibatch Fluidized Bed Reactor", 22(4), 563 (1983)
  7. Adschiri T, Shiraha T, Kojima T, Furusawa T, Fuel., “Prediction of CO2 Gasification Rate of Char in Fluidized Bed Gasifier", 65, 1688 (1986)
  8. Zhang LX, Huang JJ, Fang YT, Wang Y, Energy Fuels, “Gasification Reactivity and Kinetics of Typical Chinese Anthracite Chars with Steam and CO2”, 20(3), 1201 (2006)
  9. Molina A, Mondragon F, Fuel, “Reactivity of Coal Gasification with Steam and CO2”, 77(15), 1831 (1998)
  10. Kim TY, Seo DK, Hwang JH, KOSCO., “Characteristics of Various Ranks of Coal Gasification with CO2 by Gas Analysis", 15(2), 41 (2010)
  11. Yasyerli N, Dogu T, Dogu G, Ar I, Chem. Eng. Sci., “Deactivation Model for Textural Effects on Kinetics of Gas-solid Noncatalytic Reactions Char Gasification with CO2", 51(11), 2523 (1996)
  12. Liu H, Kaneko M, Luo C, Kato S, Kojima T, Fuel., “Effect of Pyrolysis Time on the Gasification Reactivity of Char with CO2 at Elevated Temperatures", 83, 1055 (2004)
  13. Liu H, Luo C, Toyota M, Kato S, Uemiya S, Kojima T, Tominaga H, Fuel., “Mineral Reaction and Morphology Change During Gasification of Coal in CO2 at Elevated Temperatures", 82, 523 (2003)
  14. Ye DP, Agnew JB, Zhang DK, Fuel, “Gasification of a South Australian low-rank Coal", 77(11), 1209 (1998)
  15. Seo DK, Lee SK, Kang MW, Hwang JH, Yu TU, “Gasification Reactivity of Biomass Chars with CO2,” Biomass and Bioenergy, doi:10.1016/j.biombioe. 2010.08.008 (2010)
  16. Gmez-Barea A, Ollero P, Fernndez-Baco C, Energy and Fuels., “Diffusional Effects in CO2 Gasification Experiments with Single Biomass Char Particles. 1. Experimental Investigation", 26, 2202 (2006)
  17. Souza-Santos ML, Fuel., “Comprehensive Modelling and Simulation of Fluidized Bed Boilers and Gasifiers., 68, 1507 (1989)