Relations of True Relative Density, Micro-Strength and Micro-Crystal Structure of Chars Produced by Different Rank Coals

Authors: JUN SHEN¹; GANGMING ZOU¹; ZHIZHONG WANG¹

Source: Energy Sources, Volume 26, Number 10, August 2004 , pp. 951-959(9)

Publisher: Taylor and Francis Ltd

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Abstract:

From gas coals to anthracites, 16 different rank coals were carbonized at 3°C/min in crucible. Chars and cokes produced at different temperatures were analyzed by x-ray diffraction; their true relative density and micro-strength were also measured. The true relative density of all chars produced by different rank coals increases as temperature increases. As the coals volatile increase, cokes true relative density goes down linearly. Cokes produced by weakly caking coals have the lowest true relative density, but have almost the highest micro-strength with anthracites. X-ray diffraction showed chars produced by weakly-caking coal have the largest d₀₀₂ and least L_c in all chars. Coke structure approaching graphic carbon has high true relative density and low micro-strength, while coke structure approaching non-graphic carbon has low true relative density and high micro-strength.

Keywords: char; coal; micro-strength; true relative density

Document Type: Research article

DOI: 10.1080/00908310490473246

Affiliations: 1: College of Chemical Engineering and Technology, Taiyuan University of Technology, P. R. China

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