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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 25, 2002
Accepted July 29, 2002

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Steam Gasification of an Australian Bituminous Coal in a Fluidized Bed

Woon-Jae Lee^† Sang-Done Kim¹ Byung-Ho Song²

Energy/Coal and Chemical Process Research Team, Research Institute of Industrial Science and Technology, Pohang 790-330, Korea ¹Department of Chemical Engineering and Energy & Environment Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea ²Department of Chemical Engineering, Kunsan National University, Kunsan 573-701, Korea

wjlee@risnet.rist.re.kr

Korean Journal of Chemical Engineering, November 2002, 19(6), 1091-1096(6), 10.1007/BF02707238

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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.D×1.6 m-high) at atmospheric pressure. The effects of fluidizing gas velocity (2-5 Uf/Umf), reaction temperature (750-900 ℃), 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.

Keywords

Fluidized Bed Steam Gasification Coal

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