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Received September 1, 2006
Accepted May 3, 2008
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Experimental studies on gasification of the Shenmu coal char with CO2 at elevated pressures
Department of Thermal Engineering, Tsinghua University, Beijing 100084, China 1College of Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, Korea 2Engineering Research Center for Coal Gasification, Institute of Coal Chemistry, Chinese Academy of Science, Taiyuan 030001, China, Korea
wangmm98@mails.tsinghua.edu.cn
Korean Journal of Chemical Engineering, November 2008, 25(6), 1322-1325(4), 10.1007/s11814-008-0216-x
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Abstract
The gasification rates of Shenmu coal chars with CO2 were experimentally studied with a pressurized thermo- gravimetric analyzer (PTGA). Shenmu coal is a typical Chinese coal, and the coal char was prepared by a fixedbed reactor in nitrogen at 900 ℃. The experiments were carried out in the dynamic heating segments from 750 ℃ to 1,000 ℃, and the reaction pressure increased from 0.1MPa to 3.1MPa with pure CO2. The external diffusion resistances were minimized by increasing the flow rates and decreasing the thickness of sample layer before the test, to ensure the reactions were under kinetic control. The results show that the gasification rates increase proportionally to the 0.1 power of the CO2 partial pressure. The unreacted-core shrinking model was applied to predict the reaction rate by changing the molar fraction of CO2 at 0.6Mpa and 1.6Mpa total pressures, which showed a good match with experimental data.
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References
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