中文摘要：

综述了钙元素对褐煤热解和气化特性的影响,讨论了钙元素对热解产物中挥发分、焦油产率和气体产物分布的影响,以及对褐煤半焦气化的催化作用。结果表明,与酸洗煤相比,热解过程中,钙元素降低焦油产率,提高半焦产率;气化过程中,钙元素的植入提高褐煤半焦的反应活性,缩短了反应时间。高温时钙元素主要以氧化态的形式存在,低温时则不断与半焦基体键合而参与交联反应,少部分挥发。

英文摘要：

This paper provides an overview on the impact of calcium on the pyrolysis and gasification characteristics of brown coal.The impact of calcium on the total volatile matter yield,the tar yield and the distribution of gaseous products during pyrolysis as well as its influences on the catalysis of the gasification of brown coal and chars are discussed.It is shown that the tar yield of the Ca-enriched coal is lower than that of the acid-washed coal and the char yield is higher than that of the acid-washed coal in the pyrolysis process.The reactivity of brown coal is increased and the reaction time is shortened in the gasification process because of the calcium implantation into the brown coal.Calcium oxide is the main form existing in the coal at high temperatures,but it is strongly bonded to the char structure and attends cross linking reactions and a small proportion of volatilizes.