Upgrading of Low Rank Coal as Coal Water Slurry and its Utilization

In this paper, a new brown coal utilization process, combining the techniques of coal/water slurry (CWS) production and CWS in-line vaporization, was proposed. In the process, brown coal was converted to CWS with high-pressure kneader under mechanical shear stress and moderate heating. Water in the...

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Bibliographic Details
Published in:Coal preparation (New York, N.Y.) N.Y.), 2005-10, Vol.25 (4), p.193-210
Main Authors: Moriyama, Ryo, Takeda, Shohei, Onozaki, Masaki, Katayama, Yukuo
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Coal and derived products
Coal water slurry
Energy
Exact sciences and technology
Fuel slurries
Fuels
Low rank coal
Mechanical preparation
Preheating
Processing
Shear stress
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Summary:In this paper, a new brown coal utilization process, combining the techniques of coal/water slurry (CWS) production and CWS in-line vaporization, was proposed. In the process, brown coal was converted to CWS with high-pressure kneader under mechanical shear stress and moderate heating. Water in the CWS was vaporized with a special designed pre-heater, termed an in-line vaporizer, processing about 2.0 t/day (dry coal basis). Indonesian brown coal containing 22% moisture and Australian brown coal containing 59% moisture were successfully converted to CWS. The Australian brown coal CWS was pre-heated with the in-line vaporizer. The CWS was converted to a coal/steam mixture without plugging of the feed tube and directly burned in a combustion furnace.
ISSN:0734-9343
1545-5831
DOI:10.1080/07349340500444414