Thermoplastic 상태의 석탄 점도 특성 분석Evaluation of Coal Viscosity in Thermoplastic State
- Other Titles
- Evaluation of Coal Viscosity in Thermoplastic State
- Authors
- 오명숙; 김민주
- Issue Date
- 2004
- Publisher
- 한국화학공학회
- Keywords
- Molten Coal; Viscometer; Thermoplasticity
- Citation
- Korean Chemical Engineering Research(HWAHAK KONGHAK), v.42, no.6, pp.696 - 705
- Journal Title
- Korean Chemical Engineering Research(HWAHAK KONGHAK)
- Volume
- 42
- Number
- 6
- Start Page
- 696
- End Page
- 705
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/26185
- ISSN
- 0304-128X
- Abstract
- The plasticity of coking coal is an important property influencing the strength of metallurgical coke. A
molten coal viscometer with well defined flow field under a constant shear rate was designed, and the experimental procedures
for reliable viscosity measurements were developed. The viscometer consists of a Searle-type concentric cylindrical
cell, the rotor with the shortest possible length, a small split furnace of uniform internal temperature, and the hood
for continuous vent of volatiles. The cell dimensions were determined to use the minimum possible amount of coal,
while minimizing the end effect. A packing device for uniform packing of coal particles was also developed. The viscosities
of 11 molten coals were determined. The trend in the minimum viscosity was in agreements with the trend in the
maximum fluidity measured by Gieseler plastometer, but the viscometer showed narrower measurement range than the
plastometer. The viscometer also gave the correct trends with the particle size and the packing density: the increase in
coal particle size and packing density increased the plastic period and decreased the minimum viscosity.
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