Citation: BAI Jin, KONG Ling-xue, LI Huai-zhu, GUO Zhen-xing, BAI Zong-qing, YUCHI Wei, LI Wen. Adjustment in high temperature flow property of ash from Shanxi typical anthracite[J]. Journal of Fuel Chemistry and Technology, ;2013, 41(7): 805-813. shu

Adjustment in high temperature flow property of ash from Shanxi typical anthracite

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

Corresponding author: BAI Jin,
Received Date: 3 June 2013
Available Online: 27 June 2013
Fund Project: 国家重点基础研究发展规划(973计划, 2010CB227003) (973计划, 2010CB227003) 国家自然科学青年基金(21006121) (21006121) 国家自然科学基金委员会与神华集团有限责任公司联合资助(U1261209). (U1261209)

To meet the requirement of gasification of Shanxi anthracites with slag tapping, the effects of CaO, MgO and Fe₂O₃ flux on the improvement of ash fusibility and viscosity-temperature property were evaluated and compared. The results show that for high silicon and aluminum coal ash with the Si/Al ratio from 1.2 to 2.0, the order of fluxing effect is MgO > CaO > Fe₂O₃. The difference of fluxing effect is caused by the different stable minerals formed at high temperature. For three different fluxes, the relation between the flow temperature (FT) and the liquidus temperature (t_liq) is determined. And a linear relationship between CaO or Fe₂O₃ content and FT is obtained as follows: FT= 1 593-9.573 × w_CaO (R²=0.942 9) and FT = 1 576-8.330 6 × w_Fe₂O₃ (R²=0.955 9), which are useful to guide the addition of flux. CaO, MgO and Fe₂O₃ show different effects on the viscosity-temperature character. Judging from the viscosity value and the temperature of critical viscosity, CaO displays the best performance as a flux. The different electronegativity of Ca²⁺, Mg²⁺, Fe²⁺ and the formation of different minerals with addition of CaO, MgO and Fe₂O₃ at high temperature are responsible for the various influences of flux on the viscosity value. Small ion radius of Mg²⁺ and Fe²⁺ and the possible crystallization of iron at high temperature are the reasons for the higher temperature of critical viscosity.
- Shanxi typical anthracite,
- high silicon and aluminum,
- ash fusibility,
- viscosity temperature character,
- flux
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