Steam gasification of an australian bituminous coal in a fluidized bed |
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Authors: | Woon-Jae Lee Sang-Done Kim Byung-Ho Song |
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Affiliation: | (1) Energy/Coal and Chemical Process Research Team, Research Institute of Industrial Science and Technology, 790-330 Pohang, Korea;(2) Department of Chemical Engineering and Energy & Environment Research Center, Korea Advanced Institute of Science and Technology, 305-701 Daejeon, Korea;(3) Department of Chemical Engineering, Kunsan National University, 573-701 Kunsan, Korea |
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Abstract: | To produce low calorific value gas, Australian coal has been gasified with air and steam in a fluidized bed reactor (0.1 m-I.Dx1.6
m-high) at atmospheric pressure. The effects of fluidizing gas velocity (2–5 Uf/Umf), reaction temperature (750–900 °C), air/coal ratio (1.6-3.2), and steam/coal ratio (0.63–1.26) on gas composition, gas yield,
gas calorific value of the product gas and carbon conversion have been determined. The calorific value and yield of the product
gas, cold gas efficiency, and carbon conversion increase with increasing fluidization gas velocity and reaction temperature.
With increasing air/coal ratio, carbon conversion, cold gas efficiency and yield of the product gas increase, but the calorific
value of the product gas decreases. When steam/coal ratio is increased, cold gas efficiency, yield and calorific value of
the product gas increase, but carbon conversion is little changed. Unburned carbon fraction of cyclone fine decreases with
increasing fluidization gas velocity, reaction temperature and air/coal ratio, but is nearly constant with increasing steam/coal
ratio. Overall carbon conversion decreases with increasing fluidization velocity and air/ coal ratio, but increases with increasing
reaction temperature. The particle entrainment rate increases with increasing fluidization velocity, but decreases with increasing
reaction temperature.
This paper is dedicated to Professor Dong Sup Doh on the occasion of his retirement from Korea University. |
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Keywords: | Fluidized Bed Steam Gasification Coal |
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