Thermodynamic properties of pulverized coal during rapid heating devolatilization processes. Quarterly progress report, October--December 1992
Knowledge of the thermodynamic and morphological properties of coal associated with rapid heating decomposition pathways is essential to progress in coal utilization technology. Specifically, knowledge of the heat of devolatilization, surface area and density of coal as a function of rank characteristics, temperature and extent of devolatilization in the context of rapid heating conditions is required both, for the fundamental determination of kinetic parameters of coal devolatilization, and to refine existing devolatilization sub-models used in comprehensive coal combustion codes. The objective of this research is to obtain data on the thermodynamic properties and morphology of coal under conditions of rapid heating. Specifically, the total heat of devolatilization, external surface area, BET surface area and true density will be measured for representative coal samples. In addition, for one coal, the contribution of each of the following components to the overall heat of devolatilization will be measured: the specific heat of coal/char during devolatilization, the heat of thermal decomposition of the coal, the specific heat capacity of tars, and the heat of vaporization of tars. Calibration of the heated grid calorimeter (Task 2) was completed this reporting period. Several refinements to the heated grid apparatus have been implemented which allow quantitative determination of sample heat capacity at high heating rates.
- Research Organization:
- United Technologies Research Center, East Hartford, CT (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-92PC92176
- OSTI ID:
- 10148713
- Report Number(s):
- DOE/PC/92176-T1; ON: DE93013605
- Resource Relation:
- Other Information: PBD: Mar 1993
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL
FLASH HEATING
THERMODYNAMIC PROPERTIES
DEVOLATILIZATION
SPECIFIC HEAT
REACTION HEAT
MATHEMATICAL MODELS
COAL TAR
PROGRESS REPORT
SURFACE AREA
DENSITY
COAL RANK
TEMPERATURE DEPENDENCE
VAPORIZATION HEAT
010600
010409
PROPERTIES AND COMPOSITION
PYROLYSIS AND CARBONIZATION