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미분탄 촤의 고온 총괄 CO₂ 가스화 반응율 분석을 위한 실험적 연구
김대희(Daehee Kim),최상민(Sanmin Choi),Christopher R. Shaddix,Manfred Geier 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
During oxy-fuel combustion, pulverized coal combustion occurs in the presence of elevated CO₂ level because of flue gas recirculation (FGR). Recent experimental and computational investigations about oxy-coal combustion have suggested that char-CO₂ gasification rates are sufficiently high under oxy-fuel combustion conditions to significantly influence the char combustion process. However, experimental measurements of such rates and its kinetic data under the relevant high temperature conditions (T > 1700 K, 1 atm) are lacking and this makes it difficult to predict the effect of CO₂ gasification reaction on the overall char consumption rate. To address this, we have measured both the char particle temperature size and velocity statistics and the char mass loss when two U.S. coal chars(a bittuminous and a subbituminous) are introduced into a high-temperature optical flow reactor with nearly 100% CO₂. The experimental measurements show a temperature decrease from the gasifying particles (consistent with the strong endothermicity of the char gasification reaction) and show increasing mass loss with increasing residence time and temperature, as expected. The overall gasification rate and rate coefficient are derived from the measured data and compared with the literature data.
순산소 연소환경에서 촤-CO₂ 가스화 반응과 그 kinetic rate에 관한 이해
김대희(Daehee Kim),최상민(Sangmin Choi),Christopher R. Shaddix 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
The purpose of this study is to recognize the necessity of char-CO₂ gasification reaction consideration on the oxy-coal combustion modeling and furthermore the appropriate high temperature kinetic rate. Char-CO₂ gasification studies in the literature were reviewed and it was concluded that char-CO₂ gasification reaction can contribute to the overall char burning rate, considering the elevated CO₂ level, possible lean O2 part in a boiler, real high operation temperature and the dependence of coal reactivity on CO₂ gas. The experimental method to derive the high temperature kinetic rate of CO₂ gasification reaction was presented to cover the uncertainty of previous kinetic data.