成型压力对低变质粉煤微波催化共热解的影响
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摘要
对不同成型压力下低变质粉煤与二硫化钼微粉冷压而成的型煤进行微波共热解实验.通过对热解产物收率分析、固体产物工业分析和元素分析、微观形貌(SEM)分析及红外光谱(FTIR)检测、液体产物气相色谱-质谱联用(GC-MS)检测以及气体产物组分分析等方法,研究了成型压力对型煤微波催化共热解产物收率和产品质量的影响.结果表明:随着成型压力增大,液体产物收率呈先增大后基本不变的趋势.在成型压力为7 MPa时,微波共热解所得液体产物收率达到28.4%(质量分数,下同),固体产物收率为64.0%,煤气收率为7.6%;所得煤气中CH_4,CO和H_2的体积分数分别为25.34%,31.51%和22.19%,热值为15.14MJ/m~3;焦油中羟基、单核芳烃及脂肪族—CH_2和—CH_3结构含量较高,焦油呈轻质化态势.
Microwave co-pyrolysis of low rank pulverized coal and micron-size molybdenum disulfide powder cold press molding was performed in a custom microwave oven.Effects of molding pressure on the yield and quality of microwave pyrolysis products were studied via proximate and ultimate analysis,infrared spectroscopy(FTIR),scanning electron microscope(SEM),gas chromatography-mass spectrometer(GC-MS),and gas component analysis.Results indicate that the yield of liquid product firstly increases and then substantially keeps constant with the gradually increasing of molding pressure.When the molding pressure is 7 MPa,the yield of liquid product is up to the highest of 28.4%(mass fraction,the same below),solid product yield is64.0%,coal gas yield is 7.6%,and the volume fraction of CH_4,CO and H_2 in pyrolysis gas is25.34%,31.51% and 22.19%,respectively,the heat value is 15.14 MJ/m~3.The content of—OH,mononuclear aromatic hydrocarbon,—CH_2 and—CH_3 in coal tar are higher,tar is in the trend of lightening with 7 MPa.
Microwave co-pyrolysis of low rank pulverized coal and micron-size molybdenum disulfide powder cold press molding was performed in a custom microwave oven.Effects of molding pressure on the yield and quality of microwave pyrolysis products were studied via proximate and ultimate analysis,infrared spectroscopy(FTIR),scanning electron microscope(SEM),gas chromatography-mass spectrometer(GC-MS),and gas component analysis.Results indicate that the yield of liquid product firstly increases and then substantially keeps constant with the gradually increasing of molding pressure.When the molding pressure is 7 MPa,the yield of liquid product is up to the highest of 28.4%(mass fraction,the same below),solid product yield is64.0%,coal gas yield is 7.6%,and the volume fraction of CH_4,CO and H_2 in pyrolysis gas is25.34%,31.51% and 22.19%,respectively,the heat value is 15.14 MJ/m~3.The content of—OH,mononuclear aromatic hydrocarbon,—CH_2 and—CH_3 in coal tar are higher,tar is in the trend of lightening with 7 MPa.
引文
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[2]XUE Fengfeng,LI Dong,GUO Yuting,et al.Technical Progress and the Prospect of Low-rank Coal Pyrolysis in China[J].Energy Technology,2017,5(11):1897-1907.
[3]HONG Y C,LEE S J,SHIN D H,et al.Syngas Production from Gasification of Brown Coal in a Microwave Torch Plasma[J].Energy,2012,47(1):36-40.
[4]GE Lichao,ZHANG Yanwei,WANG Zhihua,et al.Effects of Microwave Irradiation Treatment on Physicochemical Characteristics of Chinese Low-rank Coals[J].Energy Conversion and Management,2013,71:84-91.
[5]EMIR Hüseyin Simsek,FATIH Gülec,HAKAN Kavustu.Application of Kalman Filter to Determination of Coal Liquefaction Mechanisms Using Discrete Time Models[J].Fuel,2017,207:814-820.
[6]兰新哲,裴建军,宋永辉,等.一种低变质煤微波热解过程分析[J].煤炭转化,2010,33(3):15-18.LAN Xinzhe,PEI Jianjun,SONG Yonghui,et al.Analysis of Low Metamorphic Coal During Microwave Pyrolysis[J].Coal Conversion,2010,33(3):15-18.
[7]兰新哲,赵西成,马红周,等.一种微波快速中低温干馏煤的方法:中国,200810232680.4[P].2009-05-27.LAN Xinzhe,ZHAO Xicheng,MA Hongzhou,et al.A Method of Coal Microwave Rapid Low-temperature Dry Distillation:CN,200810232680.4[P].2009-05-27.
[8]周军,杨哲,吴雷,等.H2气氛中低变质煤微波热解研究[J].煤炭转化,2015,38(3):22-26.ZHOU Jun,YANG Zhe,WU Lei,et al.Study on Microwave Pyrolysis of Low Rank Coal Under H2 Atmosphere[J].Coal Conversion,2015,38(3):22-26.
[9]周军,杨哲,吴雷,等.CO2气氛中低变质煤微波热解研究[J].煤炭学报,2015,40(10):2465-2471.ZHOU Jun,YANG Zhe,WU Lei,et al.Study on Microwave Pyrolysis of Low Rank Coal Under CO2 Atmosphere[J].Journal of China Coal Society,2015,40(10):2465-2471.
[10]周军,杨哲,刘晓峰,等.低变质煤-循环煤气微波共热解研究[J].光谱学与光谱分析,2016,36(2):459-465.ZHOU Jun,YANG Zhe,LIU Xiaofeng,et al.Study on Microwave Co-pyrolysis of Low Rank Coal and Circulating Coal Gas[J].Spectroscopy and Spectral Analysis,2016,36(2):459-465.
[11]周军,兰新哲,赵西成,等.一种煤-煤气微波共热解实验装置:中国,201220436061.9[P].2013-03-13.ZHOU Jun,LAN Xinzhe,ZHAO Xicheng,et al.An Experimental Apparatus of Coal-gas Microwave Co-pyrolysis:CN,201220436061.9[P].2013-03-13.
[12]MONSEF-MIRZAI P,RAVINDRAN M,MCWHINNIE W R,et al.Rapid Microwave Pyrolysis of Coal:Methodology and Examination of the Residual and Volatile Phased[J].Fuel,1995,74:20-27.
[13]田斌,许德平,杨芳芳,等.成型压力与粉煤粒度分布对冷压型煤性能的影响[J].煤炭科学技术,2013,41(10):125-128.TIAN Bin,XU Deping,YANG Fangfang,et al.Briquetting Pressure and Fine Coal Particle Distribution Affected to Performances of Cool Pressed Briquette[J].Coal Science and Technology,2013,41(10):125-128.
[14]艾沙江·斯拉木,王永刚,林雄超,等.三道岭兰炭粉制备冶炼用型焦的工艺研究[J].煤炭转化,2016,39(2):51-58.AI SHAJIANG·SIlamu,WANG Yonggang,LIN Xiongchao,et al.Study on Process of Molding Metallurgical Coke Formed by Sandaoling Blue-coke Powder[J].Coal Conversion,2016,39(2):51-58.
[15]黄山秀,黄光许,张传祥,等.低阶烟煤制取型煤的成型机理研究[J].煤炭转化,2010,33(4):52-55.HUANG Shanxiu,HUANG Guangxu,ZHANG Chuanxiang,et al.Study on Briquette’s Mechanism in Briquette of Low Rank Bituminous Coals[J].Coal Conversion,2010,33(4):52-55.
[16]张秋利,成璇,兰新哲,等.型煤的制备工艺对煤焦油产率的影响[J].煤炭转化,2013,36(2):71-73.ZHANG Qiuli,CHENG Xuan,LAN Xinzhe,et al.Influence of Preparation Process for Coal Briquette on Coal Tar Yield[J].Coal Conversion,2013,36(2):71-73.
[17]闫敏.微波场中低变质粉煤成型热解工艺研究[D].西安:西安建筑科技大学,2013.YAN Min.Study of the Briquetting Pyrolysis Technology for Low Rank Pulverized Coal in Microwave Field[D].Xi’an:Xi’an University of Architecture and Technology,2013.
[18]郝丽芳,封萍,宋文立,等.Hypercoal对不同炼焦煤炭化改质作用的显微镜研究[J].燃料化学学报,2012,40(9):1025-1031.HAO Lifang,FENG Ping,SONG Wenli,et al.Modification Performance of Hypercoal as an Additive on Co-carbonization of Coal[J].Journal of Fuel Chemistry and Technology,2012,40(9):1025-1031.
[19]谢克昌.煤的结构与反应性[M].北京:科学出版社,2002:231-233.XIE Kechang.Coal Structure and Its Reactivity[M].Beijing:Science Press,2002:231-233.
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[21]付建平,宋永辉,闫敏,等.微波功率对低变质煤与塑料共热解焦油的影响[J].煤炭转化,2013,36(2):63-66.FU Jianping,SONG Yonghui,YAN Min,et al.Influence of Microwave Power on Co-pyrolysis Tar of Low Metamorphic Coal and Plastic[J].Coal Conversion,2013,36(2):63-66.
[22]何选明,方嘉淇,潘叶.Fe2O3/CaO对低阶煤低温催化干馏的影响[J].化工进展,2014,33(2):363-367.HE Xuanming,FANG Jiaqi,PAN Ye.Low Temperature Catalytic Co-pyrolysis of Low Rank Coal with Fe2O3/CaO[J].Chemical Industry and Engineering Progress,2014,33(2):363-367.
[23]LI Wen,WANG Na,LI Baoqing.Process Analysis of Catalytic Multi-stage Hydropyrolysis of Lignite[J].Fuel,2002,81(11/12):1495-1501.
[24]LI Baoqing,BRAEKMAN D C,CYPRSR.Catalytic Hydropyrolysis by Impregnated Sulphided Mo Catalyst[J].Fuel,1991,70(2):255-261.