摘要
为研究水洗和酸碱脱灰(UUC)对煤结构和燃烧特性的影响,选用准东褐煤为对象制备水洗煤(WWC)和脱灰煤(UUC),并运用了X射线衍射(XRD)、比表面积分析(BET)、电感耦合等离子体发射光谱(ICP-AES)和配有燃烧器的平面激光诱导荧光技术(OH-PLIF)进行研究。实验结果表明,水洗和脱灰对准东煤的灰分和主要矿物碱金属都具有一定的脱除能力,水洗可以脱除73.2%的钠和58.8%的灰分,而酸碱脱灰可以脱除95%的灰分和几乎全部的碱金属。利用OH-PLIF观测到,三种煤粉的OH-PLIF的释放总量顺序是:RC<WWC<UUC,点火延迟时间顺序是:RC>WWC>UUC,而燃尽时间顺序是:RC<WWC<UUC。出现以上实验结果的原因一是对比原煤(RC),水洗煤(WWC)的比表面积和微孔体积略有增大,而UUC的增大幅度更加明显;二是煤中的碱金属和碱土金属在煤燃烧过程中所起的催化作用。
To study the effects of water washing and acid-base deashing on the structure and combustion characteristics of coal,this paper selects Zhundong lignite as the object to prepare water washing coal(WWC)and deashing coal(UUC).The high-speed planar laser-induced fluorescence measurements(OH-PLIF)equipped with a specific burner and the characterization techniques including XRD,BET and ICP-AES are adopted in this study.The results show that both water washing and deashing can remove the ash and the main mineral alkali metals,and that water washing can remove 73.2%of sodium and 58.8%of ash,while acid-base deashing can remove almost all ash contents and the alkali metal.Compared with the RC,the total amount of OH release of WWC and UCC increases.The result is mainly caused by the increase of combustibles.The ignition of WWC and UCC is faster than that of raw coal,while the time required for burnout is opposite to the ignition delay time,which is UCC>WWC>RC.The reasons for the above results are that the alkali metal and alkaline earth metals play a catalytic role in coal combustion,and the increase of the BET surface area and the reduction of ash are conducive to heat transfer,which is favorable for ignition of pulverized coal.
作者
丁世兴
杨佐勋
丁先
康志忠
刘文毅
DING Shixing;YANG Zuoxun;DING Xian;KANG Zhizhong;LIU Wenyi(School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)
出处
《华北电力大学学报（自然科学版）》
CAS
北大核心
2018年第6期84-90,共7页
Journal of North China Electric Power University：Natural Science Edition
基金
国家科技支撑计划项目(2015BAA04B02)
作者简介
丁世兴(1992-),男,硕士研究生,研究方向为高碱煤防结渣沾污的在线检测和治理。
