Journal
FUEL
Volume 158, Issue -, Pages 968-975Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2015.02.055
Keywords
Entrained flow gasification; Continuous measurement; Cooling rate; Slag viscosity; T-CV
Categories
Funding
- National Natural Science Foundation of China [21406254, 21476247, 51409070]
- Joint Foundation of Natural Science Foundation of China
- Shenhua Group Corporation Ltd. [U1261209]
- Fundamental Research Funds for the Central Universities [HEUCFD1421]
- Foundation of State Key Laboratory of Coal Conversion [J13-14-301]
Ask authors/readers for more resources
Entrained flow gasification employs a high temperature, high pressure slagging gasifier, in which slag viscosity plays a key role in determining operating conditions. The effect of cooling rate on viscosity properties were investigated by high temperature rotational viscometer. Viscosities of two slag, which exhibited glassy and crystalline slag behavior, were determined under continuous measurement conditions. The results showed that viscosities of two slag both decreased with increasing cooling rate. When the temperature was above the liquidus temperature (T-Liquidus), the difference between slag viscosities was small. However, it showed a large difference below T-Liquidus, and a more obviously effect was observed on crystalline slag. Above T-Liquidus, slag viscosity only depended on the bulk composition of slag which was little affected by cooling rate, resulting in the small difference between viscosities measured at different cooling rates. Below T-Liquidus, slag viscosity was closely related to the amount of solid phase that was greatly affected by cooling rate. For glassy slag, mullite was not crystalized in slag during cooling, and slag viscosity depended on the compositions of slag. However, for crystalline slag, anorthite was crystalized in slag, and its amount significantly decreased with increasing cooling rate, leading to the large difference between viscosities measured at different cooling rates. Meanwhile, temperature of critical viscosity (T-CV) decreased with increasing cooling rate, and a good linear relationship existed between T-CV and cooling rate. Furthermore, T-CV measured under equilibrium conditions was able to be predicted by the linear regression formula of the continuous measurement'' experiments data. (C) 2015 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available