Thermodynamic properties of pulverized coal during rapid heating devolatilization processes. Quarterly progress report, January--March 1993
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. Morphological characterization of the parent coal samples has been completed by the University of Pittsburgh. Results are presented for true density, CO{sub 2} surface area, mercury porosimetry, and particle size and shape measurements using image analysis. The heat of thermal decomposition of PSOC 1451D (Task 5) will be calculated from the data reported here. The Task 10 effort, Morphological Characterization of Coal/Char Samples as a Function of Extent of Devolatilization, will continue at the University of Pittsburgh. Work will focus on measurement of the morphological characteristics of the char samples as a function of extent of reaction.
- 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:
- 10195101
- Report Number(s):
- DOE/PC/92176-T4; ON: DE94003299; BR: AA1505000; TRN: AHC29315%%9
- Resource Relation:
- Other Information: PBD: Jul 1993
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BITUMINOUS COAL
DEVOLATILIZATION
THERMODYNAMIC PROPERTIES
PROGRESS REPORT
COMBUSTION KINETICS
MORPHOLOGY
FLASH HEATING
REACTION HEAT
SURFACE AREA
DENSITY
SPECIFIC HEAT
CHARS
COAL TAR
EVAPORATION
POROSITY
PARTICLE SIZE
EXPERIMENTAL DATA
010600
014000
PROPERTIES AND COMPOSITION
COMBUSTION