Investigation of the rank dependence of tar evolution
The objective of this study are to develop an improved understanding of the process of coal tar evolution, its relationship to the structural characteristics of the parent coal, and the dependence of the chemical and physical properties of the tar products on the conditions of devolatilization. Data from this study are expected to allow hypothesis testing and refinements of coal devolatilization models relevant to the pulverized coal combustion process. A range of coal ranks, from a Texas lignite to a Pennsylvania anthracite, are employed in the investigation. In addition, a high temperature polymer, a polyimide, is utilized as an additional reference case. The polyimide serves as a truly polymeric reference material for examining the nitrogen evolution behavior of coal. The samples are subjected to elemental composition determination, infrared absorbance characterization, calorific value measurement, high temperature ash analysis, and maceral composition. Potential tar yields are determined by long hold time heated grid investigations of each coal at a final temperature and heating rate observed to maximize tar yields for the reference coal. Relative tar evolution kinetic behavior is determined by zero hold time heated grid investigations of each coal. 4 refs., 13 figs., 2 tabs.
- Research Organization:
- United Technologies Research Center, East Hartford, CT (United States)
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- AC22-89PC89759
- OSTI ID:
- 6202167
- Report Number(s):
- DOE/PC/89759-T3; ON: DE91005884
- Country of Publication:
- United States
- Language:
- English
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Investigation of the rank dependence of tar evolution
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Related Subjects
COAL
COMBUSTION PRODUCTS
COAL TAR
YIELDS
COAL RANK
MOLECULAR STRUCTURE
PROGRESS REPORT
VOLATILE MATTER
CARBONACEOUS MATERIALS
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
MATERIALS
MATTER
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
TAR
014000* - Coal
Lignite
& Peat- Combustion
010600 - Coal
Lignite
& Peat- Properties & Composition