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Characteristics of Various Ranks of Coal Gasification with $CO_2$ by Gas Analysis  

Kim, Yong-Tack (연세대학교 대학원 청정공학협동과정, 한국서부발전(주))
Seo, Dong-Kyun (연세대학교 기계공학과)
Hwang, Jung-Ho (연세대학교 기계공학과, 청정공학협동과정)
Publication Information
Journal of the Korean Society of Combustion / v.15, no.2, 2010 , pp. 41-49 More about this Journal
Abstract
Various coals from many countries around the world have been used for pulverized coal boiler in power plants in Korea. In this study, the gasification reactivities of various coal chars with $CO_2$ were investigated. Carbon conversion was measured using a real time gas analyzer with NDIR CO/$CO_2$ sensor. In a lab scale furnace, each coal sample was devolatilized at $950^{\circ}C$ in nitrogen atmosphere and became coal char and then further heated up to reach to a desired temperature. Each char was then gasified with $CO_2$ under isothermal conditions. The reactivities of coal chars were investigated at different temperatures. The shrinking core model (SCM) and volume reaction model(VRM) were used to interpret the experiment data. It was found that the SCM and VRM could describe well the experimental results within the carbon conversion of 0-0.98. The gasification rates for various coals were very different. The gasification rate for any coal increased as the volatile matter content increased.
Keywords
Coal gasification; Kinetic model; $CO_2$ Gasification; The volume reaction model(VRM); The shrinking; core model(SCM);
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