不同粒度半焦的低温干燥特性研究
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摘要
为了降低半焦的运输成本以及提高半焦的燃烧效率,通过扫描电镜、N_2吸附、X射线光电子能谱分析对神木半焦进行表面结构性质研究,并通过鼓风热力干燥的方式对不同粒度的半焦进行干燥脱水试验研究。结果表明:半焦的孔隙发达,但其含氧官能团较原煤有明显减少,其水分大多以物理吸附的方式存在于孔隙中,鼓风干燥可使水分充分蒸发;干燥温度越高,同一种粒度半焦的水分损失速率越快,干燥时间越短;当干燥温度小于200℃时,水分损失的快慢依次为焦粉>小粒>中粒;当干燥温度为250℃时,水分损失的快慢依次为焦粉>中粒>小粒;当温度大于300℃时,3种粒度的半焦水分损失率相接近,干燥总时间为50 min。因此,干燥温度宜采用200～250℃,干燥后的半焦会有1.0%～1.6%的水分吸湿,全水分控制在2.0%左右。
In order to reduce the transportation cost of the semi-coke and improve the combustion efficiency,scanning electron microscopy( SEM),N_2 adsorption-desorption and X-ray photoelectron spectroscopy( XPS) analysis were used to study the surface structure of Shenmu semi-coke,and the drying and dehydration on different sizes of semi-coke was studied by air-blast drying.The results show that the pores of semi-coke are developed,but the oxygen functional groups of the semi-coke are obviously reduced compared with the raw coal,and the moisture of the semi-coke is mostly physically adsorbed in the pores,and the moisture can be evaporated fully by air-blast drying.What's more,the higher the drying temperature,the faster the water loss rate of the same particle size semi-coke,and the shorter the drying time.When the drying temperature is less than 200 ℃,the dehydration rate is fine grain > small-sized grain > medium grain; when drying temperature is 250 ℃,the moisture loss is in the order of fine grain>middle grain>small grain,and when the drying temperature is more than300 ℃,the three-grained semi-coke water loss rate is close to each other,and the total drying time is 50 min.Therefore,the drying temperature should be 200 ～ 250 ℃.After drying,the dried semi-coke will have 1.0% ～ 1.6% moisture absorption,the whole moisture content will be controlled at about 2.0%.
In order to reduce the transportation cost of the semi-coke and improve the combustion efficiency,scanning electron microscopy( SEM),N_2 adsorption-desorption and X-ray photoelectron spectroscopy( XPS) analysis were used to study the surface structure of Shenmu semi-coke,and the drying and dehydration on different sizes of semi-coke was studied by air-blast drying.The results show that the pores of semi-coke are developed,but the oxygen functional groups of the semi-coke are obviously reduced compared with the raw coal,and the moisture of the semi-coke is mostly physically adsorbed in the pores,and the moisture can be evaporated fully by air-blast drying.What's more,the higher the drying temperature,the faster the water loss rate of the same particle size semi-coke,and the shorter the drying time.When the drying temperature is less than 200 ℃,the dehydration rate is fine grain > small-sized grain > medium grain; when drying temperature is 250 ℃,the moisture loss is in the order of fine grain>middle grain>small grain,and when the drying temperature is more than300 ℃,the three-grained semi-coke water loss rate is close to each other,and the total drying time is 50 min.Therefore,the drying temperature should be 200 ～ 250 ℃.After drying,the dried semi-coke will have 1.0% ～ 1.6% moisture absorption,the whole moisture content will be controlled at about 2.0%.
引文
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[16]李尤,张守玉,茆青,等.干燥温度对褐煤干燥后复吸特性的影响[J].煤炭学报,2016,41(10):2454-2459.LI You,ZHANG Shouyu,MAO Qing,et al.Effects of drying temperature on reabsorption characteristics of dried lignite[J].Journal of China Coal Society,2016,41(10):2454-2459.
[17]郭启海,张顺利,张佼阳,等.府谷半焦干燥特性研究[J].洁净煤技术,2016,22(2):5-8.GUO Qihai,ZHANG Shunli,ZHANG Jiaoyang,et al.Drying characteristics of Fugu semi-coke[J]. Clean Coal Technology,2016,22(2):5-8.
[2]贾建军.神木兰炭产业发展简析[J].煤炭加工与综合利用,2018(4):7-8.JIA Jianjun.Analysis of the development of semi coke charcoal industry in Shenmu[J]. Coal Processing&Comprehensive Utilization,2018(4):7-8.
[3]任全军,郑海兰,张军,等.熄焦工艺对焦炭质量的影响[J].河北冶金,2013(6):20-22.REN Quanjun,ZHENG Hailan,ZHANG Jun,et al. Influence of coke quenching process on quality of coke[J]. Hebei Metallurgy,2013(6):20-22.
[4]李惠娟,赵俊学,李小明,等.以干馏煤气为介质的半焦干熄焦技术研究[J].煤炭转化,2011,34(1):29-33.LI Huijuan,ZHAO Junxue,LI Xiaoming,et al.Technology research of pyrogenous coal gas used as semi-coke quenching medium[J].Coal Conversion,2011,34(1):29-33.
[5]郭启海,张顺利,张佼阳,等.府谷半焦干燥特性研究[J].洁净煤技术,2016,22(2):5-8.GUO Qihai,ZHANG Shunli,ZHANG Jiaoyang,et al. Drying characteristics of Fugu semi-coke[J].Clean Coal Technology,2016,22(2):5-8.
[6]王凯,张皓远,朱世峰.大型盘式半焦干燥机的设计开发[J].化工装备技术,2017,38(3):1-6.WANG Kai,ZHANG Haoyuan,ZHU Shifeng. Design and development of large-scale disc dryer for semi-coke[J].Chemical Equipment Technology,2017,38(3):1-6.
[7]赵乃成,张启轩.铁合金生产实用技术手册[M].北京:冶金工业出版社,2006:431-437.
[8]熊谟远.电石生产及其深加工产品[M].北京:化学工业出版社,1989:97-105.
[9]杨双平,郭拴全,张攀辉,等.兰炭对高炉混煤喷吹特性的影响[J].钢铁研究学报,2017,29(3):201-207.YANG Shuangping,GUO Shuanquan,ZHANG Panhui,et al.Influence of semi-coke on blending coal injection characteristics for blast furnace[J].Journal of Iron&Steel Research,2017,29(3):201-207.
[10]王越,张子良.半焦基本性质及其利用途径分析[J].煤质技术,2018(2):1-5.WANG Yue,ZHANG Ziliang.Analysis on semi-coke basic properties and utilization path[J]. Coal Quality Technology,2018(2):1-5.
[11]王小华,赵洪宇,宋强,等.两种不同脱水方式对褐煤热解特性的影响[J].中国煤炭,2018(4):99-105.WANG Xiaohua,ZHAO Hongyu,SONG Qiang,et al.Effects of two different dehydration methods on the pyrolysis characteristics of lignite[J].China Coal,2018(4):99-105.
[12]付志新,郭占成.焦化过程半焦孔隙结构时空变化规律的实验研究:孔结构的分形特征及其变化[J].燃料化学学报,2007,35(4):385-390.FU Zhixin,GUO Zhancheng. Variation of pore structure of semicoke with different temperature and spatial location during pyrolysis:fractal dimension of pore structure[J].Journal of Fuel Chemistry and Technology,2007,35(4):385-390.
[13]杨光,李福裿,丁会敏.浅谈改性半焦结构对其吸附性能的影响[J].化学工程师,2017(7):49-51.YANG Guang,LI Fuqi,DING Huimin. Effect of modified semicoke structure on its adsorption performance[J]. Chemical Engineer,2017(7):49-51.
[14] EVANS D G. Effects of colloidal structure on physical measurements on coals[J].Fule,1973,52:155-156.
[15]赵慧萱,王婷婷.蒲河褐煤干燥特性及清洁利用[J].石化技术,2017,24(6):267-267.ZHAO Huixin,WANG Tingting. Drying characteristics and clean utilization of Puhe brown coal[J]. Petrochemical Industry Technology,2017,24(6):267-267.
[16]李尤,张守玉,茆青,等.干燥温度对褐煤干燥后复吸特性的影响[J].煤炭学报,2016,41(10):2454-2459.LI You,ZHANG Shouyu,MAO Qing,et al.Effects of drying temperature on reabsorption characteristics of dried lignite[J].Journal of China Coal Society,2016,41(10):2454-2459.
[17]郭启海,张顺利,张佼阳,等.府谷半焦干燥特性研究[J].洁净煤技术,2016,22(2):5-8.GUO Qihai,ZHANG Shunli,ZHANG Jiaoyang,et al.Drying characteristics of Fugu semi-coke[J]. Clean Coal Technology,2016,22(2):5-8.