1994 Fiscal Year Final Research Report Summary
Thermoplastic Rate Processes of Coal Pellet under Rapid Heating
| Project/Area Number |
05650720
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Metal making engineering
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| Research Institution | Faculty of Engineering, Hokkaido University |
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Principal Investigator |
CHIBA Tadatoshi Hokkaido Univ.Fac.of Eng.Prof., 工学部, 教授 (70001295)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Coal / Coke / Softening / Needle Penetration / Heating Rate / Carbonization Mode |
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| Research Abstract |
Apparent needle penetration and volumetric dilatation were measured under N_2 gas stomosphere for a 10.0mm dia.cylindrical pellet of pulverized coal particles.The measurements were carried out as a function of the heating rate as well as the N_2 gas pressure and the holding time and temperature for different kinds of coal particles.The net penetration rates were evaluated from the observed difference between apparent rates of the penetration and the dilatation, which showed a considerable dependency on the heating rate and the parent coal properties.
The observed net penetration characteristics were analyzed by a model which assumes a consecutive reaction for semicoke formation from coal via.a plastic intermediate, a fictitions mean polymerization degree of their mixture, an existing viscosity equation and a pseudo-steady state equation of motion.
The model was found to explain reasonably well the observed penetration characteristics with an assumed viscosity change from an order of magnitude from 10^3 to 10^7MPa・s for all the cases so far examined.
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