Page 241 - Advanced Mine Ventilation

220
Btu
10,500
9,500
6,300
8,300
Limits,
Value
Calorific
8,300
9,500
6,300
1-27-29.
value.
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calorific
1968.
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Engineers,
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carbon,
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coal bitumi- coal coal coal moisture
Rank coal coal coal A B C dry, preparation.
by coal B C inherent the Coal
Coals Metaanthracite Anthracite Semianthracite Low-volatile Medium-volatile High-volatile A High-volatile bituminous High-volatile bituminous Subbituminous Subbituminous Subbituminous A B natural on DR.
of Group 1. 2. 3. 1. 2. 3. nous 4. 5. 1. 2. 3. Lignite 1. Lignite 2. its carbon fixed Mitchell
Classification containing coal more or JW, Leonard
13.4 Anthracitic Bituminous III.Subbituminous Lignitic to refers 69% having from
Table Rank I. II. IV. a Moist b Coals Adapted