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http://dx.doi.org/10.7464/ksct.2014.20.1.064

Kinetic study on Low-rank Coal Including K2CO3, Na2CO3, CaCO3 and Dolomite Gasification under CO2 Atmosphere  

Hwang, Soon Choel (Graduate School of Energy Science and Technology, Chungnam National University)
Kim, Sang Kyum (Graduate School of Energy Science and Technology, Chungnam National University)
Park, Ji Yun (Department of Applied Chemistry and Biological Engineering, Chungnam National University)
Lee, Do Kyun (Department of Applied Chemistry and Biological Engineering, Chungnam National University)
Lee, Si Hyun (Clean Coal Center, Korea Institute of Energy Research)
Rhee, Young Woo (Graduate School of Energy Science and Technology, Chungnam National University)
Publication Information
Clean Technology / v.20, no.1, 2014 , pp. 64-71 More about this Journal
Abstract
We have investigated the effects of various additives on Eco coal gasification under $CO_2$ atmosphere. The temperature ranges from $750{\sim}900^{\circ}C$ and the gasification experimental was carried out with Eco coal adding 7 wt% $K_2CO_3$, $Na_2CO_3$, $CaCO_3$, Dolomite, and non-additive under $N_2$ and $CO_2$ gas mixture. At $850^{\circ}C$, we observed that the reaction rate increased when the concentration of $CO_2$ increased. However, we also observed that the increment of reaction rate was small at more than 70% of the concentration of $CO_2$. The additives activity was ranked as 7 wt% $Na_2CO_3$ > 7 wt% $K_2CO_3$ > non-additive > 7 wt% Dolomite > 7 wt% $CaCO_3$ at $850^{\circ}C$. At the temperatures of $750^{\circ}C$, $800^{\circ}C$, $850^{\circ}C$, and $900^{\circ}C$, when the temperature increased, the gasification rate increased. The gasification was suitably described by the volumetric reaction model. Using volumetric reaction model, the activation energy of Eco coal including 7 wt% $Na_2CO_3$ gasification was 83 kJ/mol, which was the lowest value among all the alkaline additives.
Keywords
Low-rank coal; Coal gasification; Additives; $CO_2$;
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Times Cited By KSCI : 1  (Citation Analysis)
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