저급탄의 가스화에서 얻은 비산재를 활용하기 위한 목적으로 비산재의 열분해와 비산재 촤의 CO2 가스화반응에 대한 실험을 비등온의 승온 조건(10, 20, 30 ℃/min)에서 TGA를 이용하여 수행하였다. 비산재의 열분해 속도는 1차의 열분해 모델(Kissinger법)에 의해 해석하였지만, 비산재에 포함된 휘발분의 함량이 낮아 모델의 신뢰도는 낮게 평가되었다. 비산재 촤의 CO2 가스화반응에 대한 실험결과는 미반응핵 모델, 균일반응 모델 및 랜덤 기공 모델 등으로 해석하여 석탄 촤의 CO2 가스화반응 결과와 비교하였다. 저탄소가 함유된 비산재 촤(LG탄)는 200.8 kJ/mol의 활성화 에너지로 균일반응 모델의 의해 잘 모사되었으며, 고탄소가 함유된 비산재 촤(KPU탄)의 경우에는 198.3 kJ/mol의 활성화 에너지로 석탄 촤의 CO2 가스화 특성과 유사하게 랜덤 기공 모델의 의해 잘 모사되었다. 결과로서, 두 비산재 촤의 CO2 가스화반응에 대한 활성화 에너지는 큰 차이를 나타내지는 않았지만, 고정탄소의 함량에 따라 적용할 수 있는 모델이 다르다는 것을 확인할 수 있었다.

For the purpose of utilizing fly ash from gasification of low rank coal, we performed the series of experiments such as pyrolysis and char-CO2 gasification on fly ash by using the thermogravimetric analyzer (TGA) at nonisothermal heating conditions (10, 20 and 30 ℃/min). Pyrolysis rate has been analyzed by Kissinger method as a first order, the reliability of the model was lower because of the low content of volatile matter contained in the fly ash. The experimental results for the fly ash char-CO2 gasification were analyzed by the shrinking core model, homogeneous model and random pore model and then were compared with them for the coal char-CO2 gasification. The fly ash char (LG coal) with low-carbon has been successfully simulated by the homogeneous model as an activation energy of 200.8kJ/mol. In particular, the fly ash char of KPU coal with high-carbon has been successfully described by the random pore_x000D_ model with the activation energy of 198.3 kJ/mol and was similar to the behavior for the CO2 gasification of the coal char. As a result, the activation energy for the CO2 gasification of two fly ash chars don’t show a large difference, but we can confirm that the models for their CO2 gasification depend on the amount of fixed carbon.

Fly Ash CO2 Gasification Activation Energy Homogeneous Model Random Pore Model

IEA, World energy outlook, International Energy Agency (2007)
Wood DA, Nwaoha C, Towler BF, J. Nat. Gas Sci. Eng., 9, 196 (2012)
Kopyscinski J, Schildhauer TJ, Biollaz SMA, Fuel, 89(8), 1763 (2010)
ASIACHEMTM - The Coal Chemical Consultancy (2010)
Ordorica-Garcia G, Douglas P, Croiset E, Zheng LG, Energy Conv. Manag., 47(15-16), 2250 (2006)
Gnanapragasam N, Reddy B, Rosen M, Energy Conv. Manag., 50(8), 1915 (2009)
Trommer D, Steinfeld A, Energy Fuels, 20(3), 1250 (2006)
Blissett RS, Rowson NA, Fuel., 97, 1 (2012)
Ahmaruzzaman M, Prog. Energy Combust. Sci., 36, 327 (2010)
Kim SJ, Lee CG, Song PS, Yun JS, Kang Y, Kim JS, Choi MJ, J. Korean Ind. Eng. Chem., 14(5), 634 (2003)
Kissinger HE, Anal. Chem., 29, 1702 (1957)
Molina A, Mondragon F, Fuel, 77(15), 1831 (1998)
Kang SH, Ryu JH, Park SN, Byun YS, Seo SJ, Yun Y, Lee JW, Kim YJ, Kim JH, Park SR, Korean Chem. Eng. Res., 49(1), 114 (2011)
Miura K, Silveston LP, Energy Fuels., 3, 243 (1989)
Sangtong-Ngam K, Narasingha H, Thammasat Int. J. Sc. Tech., 13, 16 (2008)
Fermoso J, Gil MV, Pevida C, Pis JJ, Rubiera F, Chem. Eng. J., 161(1-2), 276 (2010)
Liu H, Luo CH, Kaneko M, Kato S, Kojima T, Energy Fuels, 17(4), 961 (2003)
Ochoa J, Cassanello MC, Bonelli PR, Cukierman AL, Fuel Process. Technol., 74(3), 161 (2001)
Sun ZQ, Wu JH, Zhang DK, Energy Fuels, 22(4), 2160 (2008)
Zhang L, Huang J, Fang Y, Wang Y, Energy Fuels., 20 (2006)