煤油共炼残渣与榆林煤共热解特性及半焦性质
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摘要
以煤油共炼残渣与榆林煤为原料,基于热重分析仪和格金干馏仪,开展共炼残渣与煤共热解过程的协同效应及半焦性质研究。实验结果表明:共炼残渣添加比例为0～40%时,煤与共炼残渣之间具有正的协同效应;添加量为20%时,焦油产率高出理论值6.2%,是煤单独热解焦油产率的139.7%,半焦产物为A型且黏结性增加;半焦性质分析结果显示,共炼残渣能够提高半焦在CO_2气化过程中的最大失重速率,有利于气化反应的进行,但会使半焦的燃烧性能变差且在添加量高于20%的情况下更为明显。
Co-pyrolysis behavior and char properties of Yulin coal blended with residue from China YanChang industrial direct coal liquefaction plant has been investigated through thermogravimetry spectrometry and Gray-king low-temperature carbonization. The results show a positive synergistic effect in the pyrolysis process when the proportion of residue is lower than 40%. When the amount of residue is 20%, the yield of tar is higher more than the theoretical value of 6.201% which is 139.7% of the coal alone, when the amount of residue is 20%, the char is A type and the cohesiveness increases. The residue increases the maximum weight loss rate of char during CO_2 gasification, which helps the gasification, but impedes the combustion of char, which is even worse when amount of residue is higher than 20%.
Co-pyrolysis behavior and char properties of Yulin coal blended with residue from China YanChang industrial direct coal liquefaction plant has been investigated through thermogravimetry spectrometry and Gray-king low-temperature carbonization. The results show a positive synergistic effect in the pyrolysis process when the proportion of residue is lower than 40%. When the amount of residue is 20%, the yield of tar is higher more than the theoretical value of 6.201% which is 139.7% of the coal alone, when the amount of residue is 20%, the char is A type and the cohesiveness increases. The residue increases the maximum weight loss rate of char during CO_2 gasification, which helps the gasification, but impedes the combustion of char, which is even worse when amount of residue is higher than 20%.
引文
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[17]喻秋梅,庞亚军.煤燃烧试验中着火点确定方法的探讨[J].华北电力技术,2001(7):9-10.
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[19]邓剑,罗永浩,张云亮,等.生物质半焦与煤混合气化协同作用的动力学研究[J].燃料化学学报,2012,40(8):944-951.
[20]楚希杰,李文,李保庆,等.煤直接液化残渣焦CO2气化反应的研究[J].燃料化学学报,2006,34(2):146-150.
[2]黄传峰,韩磊,王孟艳,等.煤加氢液化残渣的性质及应用研究进展[J].现代化工,2016,36(6):19-23.
[3]林雄超,郭丰华,庞亚恒,等.无烟煤复配煤液化残渣制备型煤研究[J].煤炭技术,2015,34(2):272-274.
[4]LV Dongmei,WEI Yuchi,BAI Zongqing.An approach for utilization of direct coal liquefaction residue:blending with low-rank coal to prepare slurries for gasification[J].Fuel,2015,145:143-150.
[5]BAI Lu,NIE Yi,LI Yi,et al.Protic ionic liquids extract asphaltenes from direct coal liquefaction residue at room temperature[J].Fuel Processing Technology,2013,108:94-100.
[6]董子平,闫大海,何洁.煤直接液化残渣掺烧的燃烧特性及其苯系物的排放特征[J].环境科学研究,2015,28(8):1253-1259.
[7]WU Mengmeng,YANG Jianli,ZHANG Yuzhen.Comparison study of modified asphalt by different coal liquefaction residues and different preparation methods[J].Fuel,2012,100:66-72.
[8]LI Xiaohong,XUE Yanli,FENG Jie,et al.Co-pyrolysis of lignite and Shendong coal direct liquefaction residue[J].Fuel,2015,144:342-348.
[9]畅志兵,初茉,孙任晖,等.煤直接液化残渣与褐煤共热解动力学研究[J].煤炭科学技术,2015,43(3):138-142.
[10]宋永辉,吴春辰,史军伟,等.液化残渣添加量对低变质粉煤制备型焦的影响[J].燃烧科学与技术,2015,21(1):28-35.
[11]XU Long,TANG Mingchen,DUAN Lin’e,et al.Pyrolysis characteristics and kinetics of residue from China Shenhuaindustrial direct coal liquefaction plant[J].Thermochimica Acta,2014,589:1-10.
[12]WEN H,KONG L,BAI Jin,et al.Transformation of minerals in direct coal liquefaction residue under gasification atmosphere at high temperatures[J].Journal of Fuel Chemistry and Technology,2015,43(3):257-265.
[13]周俊虎,平传娟,杨卫娟,等.用热重红外光谱联用技术研究混煤热解特性[J].燃料化学学报,2004,6(32):658-622.
[14]舒歌平,史士东,李克建.煤炭液化技术[M].北京:煤炭工业出版社,2003:91-95.
[15]张小培,张成,余圣辉,等.准东煤水热提质过程中煤质特性变化对CO2气化影响[J].燃料化学学报,2017,45(10):1185-1190.
[16]景旭亮,王志青,余钟亮,等.半焦的多循环气化活性及微观结构分析[J].燃料化学学报,2013,8(41):917-921.
[17]喻秋梅,庞亚军.煤燃烧试验中着火点确定方法的探讨[J].华北电力技术,2001(7):9-10.
[18]马淞江,刘晓芳,戴谨泽,等.温和热解条件下内蒙褐煤热解半焦的燃烧性能[J].煤炭学报,2015,40(5):1153-1159.
[19]邓剑,罗永浩,张云亮,等.生物质半焦与煤混合气化协同作用的动力学研究[J].燃料化学学报,2012,40(8):944-951.
[20]楚希杰,李文,李保庆,等.煤直接液化残渣焦CO2气化反应的研究[J].燃料化学学报,2006,34(2):146-150.