Heat capacity of coal chars

Thesis/Dissertation · Fri Jan 01 00:00:00 EST 1982

OSTI ID:5379757

Wang, W Y

The selected starting materials were, a North Dakota lignite, an Illinois No. 6 bituminous and a Virginia coking coal. The carbon content of these coals ranged from 59 to 75 wt% (mineral matter included). Half of each of the received coal sample was demineralized using a standard procedure. Chars were prepared from the received and demineralized pulverized coals by pyrolysis. Heating rate of 5/sup 0/C/minute was employed for the pyrolysis under dry nitrogen gas atmosphere. The pyrolysis temperatures were 700, 900 and 1100/sup 0/C for periods of 0.1, 1 and 24. The char samples were characterized by chemical composition analysis, x-ray diffraction and porosimetry. Heat capacity data were collected over 75 to 300/sup 0/K temperature range using an adiabatic calorimeter. The heat capacity of these samples increases, with increasing temperature and moisture content, and its behavior and order of magnitude are similar to that of carbon when compared on a moisture free basis. Due to the uncertainties of the chemical forms of the mineral matter and the water phase below room temperature, all the heat capacity data are analyzed on a dry mineral matter free basis.

• OSTI ID: 5379757
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CHARS
CALORIFIC VALUE
STRUCTURAL CHEMICAL ANALYSIS
COAL
PYROLYSIS PRODUCTS
BITUMINOUS COAL
CALORIMETRY
CHEMICAL ANALYSIS
HEATING RATE
HIGH TEMPERATURE
ILLINOIS
LIGNITE
MEDIUM TEMPERATURE
MOISTURE
NITROGEN
NORTH DAKOTA
SPECIFIC HEAT
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TIME DEPENDENCE
VERY HIGH TEMPERATURE
VIRGINIA
X-RAY DIFFRACTION
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
COHERENT SCATTERING
COMBUSTION PROPERTIES
DIFFRACTION
ELEMENTS
ENERGY SOURCES
FEDERAL REGION III
FEDERAL REGION V
FEDERAL REGION VIII
FOSSIL FUELS
FUELS
MATERIALS
NONMETALS
NORTH AMERICA
PHYSICAL PROPERTIES
SCATTERING
USA
010600* - Coal
Lignite
& Peat- Properties & Composition