燃料化学学报2013，Vol.41Issue(7)：805-813,9.
山西典型无烟煤灰流动性的调控
Adjustment in high temperature flow property of ash from Shanxi typical anthracite
摘要
Abstract
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 (tliq) is determined.And a linear relationship between CaO or Fe2O3 content and FT is obtained as follows:FT=1593-9.573 × wCaO(R2 =0.9429) and FT =1576-8.3306× wFe2O3(R2 =0.9559),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.关键词
山西典型无烟煤/高硅铝/熔融性/黏温特性/助熔剂Key words
Shanxi typical anthracite/ high silicon and aluminum/ ash fusibility/ viscosity temperature character/ flux分类
化学化工引用本文复制引用
白进,孔令学,李怀柱,郭振兴,白宗庆,尉迟唯,李文..山西典型无烟煤灰流动性的调控[J].燃料化学学报,2013,41(7):805-813,9.基金项目
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）
