By ASTM standards, sub-bituminous coals have calorific (heating) values of 8,300 to 11,500 Btu/lb (ASTM, 2014). In practice, however, there is considerable overlap between what is called a higher rank sub-bituminous coal (subbituminous A) and a lower rank bituminous (high volatile C) coal.
Sub-bituminous coal is a lower grade of coal that contains 35–45% carbon. The properties of this type are between those of lignite, the lowest grade of coal. |
Subbituminous Coal - an overview | ScienceDirect Topics www.sciencedirect.com › topics › engineering
Coal typically contains 35%–45% carbon, and it has a lower heating value than bituminous coal. Most subbituminous coal in the United States is at least 100 ... |
Subbituminous coal contains 42 to 52 percent carbon (on a dry, ash-free basis) and has calorific values ranging from about 19 to 26 megajoules per kilogram ( ... |
Defined as non-agglomerating coals with a gross calorific value between 4 165 kcal/kg (17.4 GJ/t) and 5 700 kcal/kg (23.9 GJ/t). |
Energy Yearbook - Definitions - UN Statistics Division unstats.un.org › yearbook › def_english_print
Hard coal: Coal that has a high degree of coalification with a gross calorific value above 23,865 KJ/kg (5,700 kcal/kg) on an ash-free ... |
typical U.S. bituminous coals range from 10,720 to 14,730 Btu/lb. 3. The heating values of subbituminous coals range from 8,300 to 11,500 Btu/lb on a wet, ... |
Its gross calorific value is greater than 23 865 kJ/kg. (5 700 kcal/kg) on an ash-free but moist basis. © OECD/IEA, 2008. Page 6. Other bituminous …… (steam) ... |
Sub-bituminous coal is used for generating electricity and space heating. Sub-bituminous coal has calorific values ranging from 5 - 6.8 kW/kg approximately. |
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