改性黄蒿型煤型焦的性状研究  

Characterization of modified Artemisia annua coal type coke

作　　者：谢诗韵 陈娟[1,2] 刘元 刘儒 闫龙 李健[1,2] 王玉飞 张智芳[1,4] 闫海军 Xie Shiyun;Chen Juan;Liu Yuan;Liu Ru;Yan Long;Li Jian;Wang Yufei;Zhang Zhifang;Yan Haijun(School of Chemistry and Chemical Engineering,Yulin University,Yulin 719000,Shaanxi,China;Shaanxi Key Laboratory ofLow Metamorpcoal Clean Utilization,Yulin 719000,Shaanxi,China;National Coal and Salt Chemical Product Quality Supervision and Inspection Center(Yulin),Yulin 719000,Shaanxi,China;Shaanxi University Engineering Research Center for High Value Utilization of Coal Semicoke Derivatives,Yulin 719000,Shaanxi,China)

机构地区：[1]榆林学院化学与化工学院,陕西榆林719000 [2]陕西省低变质煤洁净利用重点实验室,陕西榆林719000 [3]国家煤及盐化工产品质量监督检验中心(榆林),陕西榆林719000 [4]煤制半焦衍生液高值利用陕西省高校工程研究中心,陕西榆林719000

出　　处：《工业催化》2024年第1期66-74,共9页Industrial Catalysis

基　　金：国家自然科学基金项目(21663034,21763030);陕西省科技统筹创新工程计划项目(2016KTZDGY08-04-01);陕西省教育厅产业化项目(20JC039);陕西省科技资源开放共享平台项目(2019PT-18);陕西省科技厅项目(2018GY-086,2021GY-165);陕西省科技厅重点产业创新链项目(2021ZDLGY13-05);陕西省市场监督管理局科技计划项目(2020KY18);榆林市科技局产学研项目(CXY-2021-107,CXY-2021-108,2019-81-1);陕西省技术创新引导专项(基金)(2021CGBX-08);榆林高新区“科学家+工程师”项目(YGXKG-2022-104);榆能科技创新项目计划(yn2022ky-29)。

摘　　要：采用2.5%NaOH改性的黄蒿为粘结剂,对六组不同粒级神木粉煤原料进行干法冷压制备改性黄蒿型煤,再经热解制备改性黄蒿型焦。借助扫描电镜(SEM)、红外光谱仪(FT-IR)对型煤和型焦进行表征,并测定其性能强度。结果表明,与型煤相比,型焦的红外特征峰强度明显减弱,谱峰数量减少,热解过程中主要发生脱水、裂解、缩聚反应,小分子及活性官能团被大量破坏,烃链结构缩合,型焦芳香度增加,其芳香度指数为4.34。型煤的性能强度随着神木煤粉粒度减小而减小。粒度较小的粉煤在成型压力作用下煤粒间隙越小,型煤脱模后受膨胀压力影响导致性能强度降低。粉煤粒度越大,煤粒间隙较大,可容纳较多粘结剂,并与煤粒产生一定的啮合力,保证了型煤的性能强度。型焦整体性能强度优于型煤。热解过程部分含氧官能团被C-C取代,并伴随挥发性物质逸出,产生的气孔分布均匀、壁厚较大,进而保证型焦性能强度。型焦强度随着神木煤粉粒度增大而增大,当神木粉煤粒级在(3~1.5)mm时,型焦抗压强度为3338.9 N/个,跌落强度为98.96%,抗碎强度为83.16%。Using 2.5%NaOH modified Artemisia annua as the binder,modified Artemisia annua coal was created by dry cold pressing,and modified Artemisia annua coal type coke was created by pyrolyzing six groups of raw Shenmu pulverized coal materials with various particle sizes.Using scanning electron microscopy(SEM)and infrared spectroscopy(FTIR),performance strength of the coal-type coke was evaluated.The experimental findings demonstrated that as compared to the FTIR spectra of the type coal,the intensity and quantity of the infrared distinctive peaks of the type coke were greatly reduced.Dehydration,cleavage,and condensation processes predominated throughout the pyrolysis process,which destroyed tiny molecules and active functional groups in huge amounts.The hydrocarbon chain structure was also condensed to increase the type of coke’s aromaticity,which was measured at 4.34.The performance strength of pulverized coal decreases with decreasing coal particle size because there is less space between the coal particles when they are molded and when they are expanded after demolding.The distance between pulverized coal particles expands with increasing coal particle size,allowing for additional binder to be added and producing a particular amount of engagement force with the coal particles to guarantee the coal’s performance strength.Coke outperforms coal in terms of total performance strength.During the pyrolysis process,some functional groups that include oxygen are replaced by C-C.Together with the release of volatile compounds,the resultant pores are equally distributed and have a wider wall thickness,which in turn assures the performance strength of the kind of coke.The performance strength of the type coke increases with the increase of pulverized Shenmu coal particle size.When the particle size of Shenmu pulverized coal is(3-1.5)mm,the compressive strength of the type coke is 3338.9 N/pc,the drop strength is 98.96%,and the crushing strength is 83.16%.

关 键 词：粉煤 改性黄蒿 型煤 型焦 强度 

分 类 号：TQ520.6[化学工程—煤化学工程]