Abstract
Semi-cokes from Gieseler plastometry experiments on high volatile bituminous coals conducted under both ASTM 2639 (3°C/min temperature ramp) and isothermal conditions, the latter run at both varied temperatures and at fixed times at a single temperature, were studied for their optical texture. There is some relationship between semi-coke texture and coal rank, with semi-cokes from higher rank coals showing a greater tendency towards the development of a flow texture and, in certain cases, the progression from isotropic to anisotropic semi-coke. Increases in both time and temperature promote a similar tendency towards the development of a flow texture and, in the case of an eastern Kentucky coal, the progression from isotropic to anisotropic semi-coke. Vitrinite types with a greater initial organic sulfur content exhibit flow textures at shorter times than comparatively low-sulfur vitrinite.
Original language | English |
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Pages (from-to) | 445-451 |
Number of pages | 7 |
Journal | Fuel |
Volume | 78 |
Issue number | 4 |
DOIs | |
State | Published - Mar 1999 |
Keywords
- Coals
- Semi-cokes
- Vitrinite
ASJC Scopus subject areas
- General Chemical Engineering
- Fuel Technology
- Energy Engineering and Power Technology
- Organic Chemistry