低变质粉煤与沥青成型热解制备型焦的研究
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摘要
以低变质粉煤(CY)为原料,沥青(LQ)为黏结剂,采用成型热解技术制备型焦,主要研究了原料粒径、LQ添加量、热解温度、保温时间和氧化预处理等因素对型焦抗压强度与收率的影响规律,采用热重实验对二者的共热解过程进行分析。结果表明:随着LQ添加量的增加,型焦抗压强度呈现先增大后减小的趋势;提高热解温度及进行氧化预处理均可提高型焦的抗压强度。当CY与LQ的粒径分别为75μm和96μm,LQ添加量为40%,热解温度为850℃,保温时间为5.0h时,型焦的抗压强度为18.905MPa,收率为66.07%。热重实验结果表明,CY和LQ共热解过程中存在着明显的协同作用。
Based on the low rank pulverized coal(CY)as raw material,coal tar pitch(LQ)as the binder,the formed coke was prepared by forming pyrolysis technology.The effects of raw material particle size,LQ addition,pyrolysis temperature,pyrolysis retention time and oxidation pretreatment on the compressive strength and yield of formed coke were studied.The co-pyrolysis process was analyzed by thermogravimetric experiment(TG-DTG).The results show that with the increase of LQ addition,the compressive strength of the formed coke gradually increases and then decreases.The higher pyrolysis temperature,the greater compressive strength of formed coke.Oxidation pretreatment can increase the compressive strength of formed coke.Under the condition of CY particle size 75μm,LQ particle size 96μm,LQ addition 40%,the pyrolysis temperature 850℃and the pyrolysis retention time 5.0 h,the compressive strength of formed coke is 18.905 MPa,yield is 66.07%.There is a significant synergistic effect on the CY and LQ co-pyrolysis process by TG-DTG.
Based on the low rank pulverized coal(CY)as raw material,coal tar pitch(LQ)as the binder,the formed coke was prepared by forming pyrolysis technology.The effects of raw material particle size,LQ addition,pyrolysis temperature,pyrolysis retention time and oxidation pretreatment on the compressive strength and yield of formed coke were studied.The co-pyrolysis process was analyzed by thermogravimetric experiment(TG-DTG).The results show that with the increase of LQ addition,the compressive strength of the formed coke gradually increases and then decreases.The higher pyrolysis temperature,the greater compressive strength of formed coke.Oxidation pretreatment can increase the compressive strength of formed coke.Under the condition of CY particle size 75μm,LQ particle size 96μm,LQ addition 40%,the pyrolysis temperature 850℃and the pyrolysis retention time 5.0 h,the compressive strength of formed coke is 18.905 MPa,yield is 66.07%.There is a significant synergistic effect on the CY and LQ co-pyrolysis process by TG-DTG.
引文
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[17]ZHAO Huan,YU Jianglong,LIU Junshuai,et al.Experimental Study on the Self-heating Characteristics of Indonesian Lignite During Low Temperature Oxidation[J].Fuel,2015,150:55-63.
[2]陈娟,李健,张智芳,等.神木粉煤粒度对型煤型焦工业分析的影响[J].中国煤炭,2018,44(9):87-91.CHEN Juan,LI Jian,ZHANG Zhifang,et al.Effect of Shenmu Pulverized Coal Size on Industrial Analysis of Briquette Coal and Formed Coke[J].China Coal,2018,44(9):87-91.
[3]李岩.我国煤焦油产业发展及趋势研究[J].化学工业,2012,30(7):14-16.LI Yan.Development and Trend of Coal Tar Industry in China[J].Chemical Industry,2012,30(7):14-16.
[4]田本良.煤沥青的组成和性质[J].炭素技术,1986(6):11-19.TIAN Benliang.Composition and Properties of Coal Asphalt[J].Carbon Techniques,1986(6):11-19.
[5]庞伟伟.3种煤沥青的微观结构研究[J].材料导报,2014(增刊1):322-324.PANG Weiwei.Investigation of Microstructure for Three Kinds of Coal-tar Pitch[J].Materials Review,2014(Supplement 1):322-324.
[6]骆仲泱,王少鹏,方梦祥,等.煤焦油沥青的深度利用及发展前景[J].化工进展,2016,35(2):611-616.LUO Zhongyang,WANG Shaopeng,FANG Mengxiang,et al.Further Processing and Prospect of Coal Tar Pitch Utilization[J].Chemical Industry and Engineering Progress,2016,35(2):611-616.
[7]PAUL S A,HULL A S,PLANCHER H,et al.Use of Asphalts for Formcoke Briquettes[J].Fuel Processing Technology,2002,76(3):211-230.
[8]白永建,许德平,王永刚.煤沥青对不同变质程度煤成焦性能的影响[J].煤炭转化,2013,36(2):59-62.BAI Yongjian,XU Deping,WANG Yonggang.Effect of Coal Tar Pitch on the Coking Performances from Different Rank of Coals[J].Coal Conversion,2013,36(2):59-62.
[9]SHARMA A K,DAS B P,TRIPATHI P S M,et al.Influence of Properties of Bituminous Binders on the Strength of Formed Coke[J].Fuel Processing Technology,2002,75(3):201-214.
[10]尹宁,宋永辉,贺文晋,等.低温氧化处理对低变质粉煤制备型焦的影响[J].煤炭学报,2017,42(增刊2):518-524.YIN Ning,SONG Yonghui,HE Wenjin,et al.Effect of Low Temperature Oxidation of Preparation of Formed Coke from Low Rank Pulverized Coal[J].Journal of China Coal Society,2017,42(Supplement 2):518-524.
[11]SONG Yonghui,HE Wenjin,MA Qiaona,et al.Effect of Binder Composition on the Preparation of Formed Coke with Lowrank Coal[J].International Journal of Coal Preparation and Utilization,2017:1-13.https://doi-org/10.1080119392699.2017.1363738.
[12]罗道成,刘俊峰,郑李辉,等.煤焦油软沥青中多环芳烃的分离及其成分分析[J].煤炭学报,2011,36(11):1901-1905.LUO Daocheng,LIU Junfeng.ZHENG Lihui,et al.Separation of Polycyclic Aromatic Hydrocarbons in Soft Pitch from Coal Tar and Its Compositions Analysis[J].Journal of China Coal Society,2011,36(11):1901-1905.
[13]马名杰,王永刚,周翔.煤料的粒度对型焦抗压强度的影响[J].煤炭学报,2007,32(4):441-444.MA Mingjie,WANG Yonggang,ZHOU Xiang.Effect of the Size and the Proportion of Gas Coal and Coal-tar on the Consistcompressive Strength of Formed Coke[J].Journal of China Coal Society,2007,32(4):441-444.
[14]钟强,杨永斌,李骞,等.型焦煤沥青黏结性能的强化[J].中南大学学报(自然科学版),2016,47(12):3971-3976.ZHONG Qiang,YANG Yongbin,LI Qian,et al.Intensification Cohesiveness of Coal Tar Pitch Used in Formed Coke[J].Journal of Central South University(Science and Technology),2016,47(12):3971-3976.
[15]MUKHAMAD Nurhadi,JON Efendi,SIEW Ling Lee,et al.Utilization of Low Rank Coal as Oxidation Catalyst by Controllable Removal of Its Carbonaceous Component[J].Journal of the Taiwan Institute of Chemical Engineers,2015,46:183-190.
[16]杨永斌,钟强,姜涛,等.煤沥青型焦制备与固结机理[J].中南大学学报(自然科学版),2016,47(7):2181-2188.YANG Yongbin,ZHONG Qiang,JIANG Tao,et al.Preparation and Mechanism of Formed Coke with Coal Tar Pitch as Binder[J].Journal of Central South University(Science and Technology),2016,47(7):2181-2188.
[17]ZHAO Huan,YU Jianglong,LIU Junshuai,et al.Experimental Study on the Self-heating Characteristics of Indonesian Lignite During Low Temperature Oxidation[J].Fuel,2015,150:55-63.