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http://dx.doi.org/10.9713/kcer.2013.51.4.493

Kinetic Studies of CO2 Gasification by Non-isothermal Method on Fly Ash Char  

Kang, Suk-Hwan (Plant Engineering Center, Institute for Advances Engineering (IAE))
Ryu, Jae-Hong (Plant Engineering Center, Institute for Advances Engineering (IAE))
Lee, Jin-Wook (Plant Engineering Center, Institute for Advances Engineering (IAE))
Yun, Yongseung (Plant Engineering Center, Institute for Advances Engineering (IAE))
Kim, Gyoo Tae (SK Innovation Global Technology)
Kim, Yongjeon (SK Innovation Global Technology)
Publication Information
Korean Chemical Engineering Research / v.51, no.4, 2013 , pp. 493-499 More about this Journal
Abstract
For the purpose of utilizing fly ash from gasification of low rank coal, we performed the series of experiments such as pyrolysis and char-$CO_2$ gasification on fly ash by using the thermogravimetric analyzer (TGA) at non-isothermal heating conditions (10, 20 and $30^{\circ}C/min$). 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-$CO_2$ gasification were analyzed by the shrinking core model, homogeneous model and random pore model and then were compared with them for the coal char-$CO_2$ gasification. The fly ash char (LG coal) with low-carbon has been successfully simulated by the homogeneous model as an activation energy of 200.8 kJ/mol. In particular, the fly ash char of KPU coal with high-carbon has been successfully described by the random pore model with the activation energy of 198.3 kJ/mol and was similar to the behavior for the $CO_2$ gasification of the coal char. As a result, the activation energy for the $CO_2$ gasification of two fly ash chars don't show a large difference, but we can confirm that the models for their $CO_2$ gasification depend on the amount of fixed carbon.
Keywords
Fly Ash; $CO_2$ Gasification; Activation Energy; Homogeneous Model; Random Pore Model;
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