添加微波脱硫助剂对新峪焦煤介电特性的影响
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摘要
通过对新峪焦煤中添加助剂进行微波脱硫实验,探究了微波频率在2.45GHz下,酸性助剂(HCl)、碱性助剂(NaOH)、还原性助剂(HI)和氧化性助剂(HCOOH-H2O2)分别与新峪焦煤结合所得脱硫率,利用传输反射法测定煤样在0.1～6.5GHz频率范围微波脱硫前后的介电常数,表征介电特性发生的变化。研究结果表明:在0.1～6.5GHz频段范围内,伴随着盐酸溶液的浓度增加,煤样相对介电常数、相对介质损失因子和介质耗散因子相对应增加;煤样经氢氧化钠溶液处理后相对介电常数随着微波频率的增加而降低;氢碘酸溶液处理后的煤样相对介电常数曲线随频率的增加缓慢下降;甲酸-过氧化氢溶液处理后的煤样相对介电常数曲线趋于稳定,不再随频率的增加缓慢下降,在6.0GHz后曲线开始上扬。
The microwave desulfurization experiment is carried out by adding additives to Xinyu coking coal.In the microwave frequency at 2.45 GHz,acidic auxiliary(HCI),alkaline auxiliary(NaOH),reducing auxiliary(HI)and oxidizing auxiliary(HCOOH-H2 O2)are obtained desulfurization rate combined with the Xinyu coking coal,and the transmission and reflection method is used to measure the dielectric constants of coal samples before and after microwave desulfurization in the frequency range of 0.1-6.5 GHz to characterize the changes in the dielectric properties.The results show that the relative permittivity,relative medium loss factor and medium dissipation factor of the coal sample increase with the increase of the concentration of hydrochloric acid solution in the range of 0.1-6.5 GHz;the relative permittivity of the coal sample after sodium hydroxide solution treatment decreases with the increase of microwave frequency;the relative permittivity curve of the coal sample treated with the hydroiodic acid solution slowly decreases with the frequency increase;after the formic acid-hydrogen peroxide solution treatment,the relative permittivity curve of the coal sample tends to be stable and does not gradually decrease with the increase of the frequency,and the curve starts to rise after 6.0 GHz.
The microwave desulfurization experiment is carried out by adding additives to Xinyu coking coal.In the microwave frequency at 2.45 GHz,acidic auxiliary(HCI),alkaline auxiliary(NaOH),reducing auxiliary(HI)and oxidizing auxiliary(HCOOH-H2 O2)are obtained desulfurization rate combined with the Xinyu coking coal,and the transmission and reflection method is used to measure the dielectric constants of coal samples before and after microwave desulfurization in the frequency range of 0.1-6.5 GHz to characterize the changes in the dielectric properties.The results show that the relative permittivity,relative medium loss factor and medium dissipation factor of the coal sample increase with the increase of the concentration of hydrochloric acid solution in the range of 0.1-6.5 GHz;the relative permittivity of the coal sample after sodium hydroxide solution treatment decreases with the increase of microwave frequency;the relative permittivity curve of the coal sample treated with the hydroiodic acid solution slowly decreases with the frequency increase;after the formic acid-hydrogen peroxide solution treatment,the relative permittivity curve of the coal sample tends to be stable and does not gradually decrease with the increase of the frequency,and the curve starts to rise after 6.0 GHz.
引文
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[20]熊飞,李文华,姜英.用熔融苛性碱脱除煤中硫分[J].煤炭转化,1993,16(1):67-75.XIONG Fei,LI Wenhua,JIANG Ying.Removal of sulfur from coal by melting caustic[J].Coal Conversion,1993,16(1):67-75.
[2]胡颖,沈怡青,胡维淳,等.高硫煤的清洁利用[J].煤炭加工与综合利用,2017(7):87-89.HU Ying,SHEN Yiqing,HU Weichun,et al.Clean utilization of high sulfur coal[J].Coal Processing and Comprehensive U-tilization,2017(7):87-89.
[3]DEMIRBAS Ayhan,BALAT Mustafa.Coal desulfurization via different methods[J].Energy Sources,2004,26(6):541-550.
[4]MA X,ZHANG M,MIN F,et al.Fundamental study on removal of organic sulfur from coal by microwave irradiation[J].International Journal of Mineral Processing,2015,139:31-35.
[5]严东,周敏.煤炭微波脱硫技术研究现状与发展[J].煤炭科学技术,2012,40(7):125-128.YAN Dong,ZHOU Min.Research status and development of coal microwave desulfurization technology[J].Journal of Coal Science and Technology,2012,40(7):125-128.
[6]MKETO N,NOMNGONGO P N,NGILA J C.Evaluation of different microwave-assisted dilute acid extracting reagents on simultaneous coal desulphurization and demineralization[J].Fuel,2016,163(1):189-195.
[7]周敏,杨絮,宋利强,等.煤炭微波脱硫研究进展[J].河南理工大学学报:自然科学版,2013,32(6):760-763.ZHOU Min,YANG Xu,SONG Liqiang,et al.Progress in microwave desulfurization of coal[J].Journal of Henan Polytechnic University:Natural Science Edition,2013,32(6):760-763.
[8]JORJANI E,REZAI B,VOSSOUGHI M,et al.Desulfurization of Tabas coal with microwave irradiation/peroxyacetic acid washing at 25,55and 85℃[J].Fuel,2004,83(7):943-949.
[9]MESROGHLI S,YPERMAN J,JORJANI E,et al.Changes and removal of different sulfur forms after chemical desulfurization by peroxyacetic acid on microwave treated coals[J].Fuel,2015,154(8):59-70.
[10]ELSAMAK G G,ZTA爦N A,YRM Y.Chemical desulfurization of Turkish Cayirhan lignite with HI using microwave and thermal energy[J].Fuel,2003,82(5):531-537.
[11]亢旭,陶秀祥,许宁.不同助剂下的炼焦煤微波脱硫试验研究[J].中国科技论文,2015,10(3):266-269.KANG Xu,TAO Xiuxiang,XU Ning.Coking coal desulfurization by microwave radiation under different experimental study aids[J].Chinese Scientific Papers,2015,10(3):266-269.
[12]杨笺康,吴元民.介电性质与煤微波脱硫的关系[J].煤炭科学技术,1985(7):25-27.YANG Yikang,WU Yuanmin.Relationship between dielectric properties and microwave desulfurization of coal[J].Coal Science and Technology,1985(7):25-27.
[13]赵东梅.炼焦煤介电特性及微波脱硫研究[D].徐州:中国矿业大学,2015.
[14]盛宇航,陶秀祥,许宁.煤炭微波脱硫影响因素的试验研究[J].中国煤炭,2012,38(4):80-82.SHENG Yuhang,TAO Xiuxiang,XU Ning.Experimental study on factors affecting microwave desulfurization of coal[J].China Coal,2012,38(4):80-82.
[15]刘松,张明旭,蔡川川.煤微波脱硫介电性质变化及其影响因素[J].选煤技术,2014(6):7-10,14.LIU Song,ZHANG Mingxu,CAI Chuanchuan.Changes in dielectric properties of coal microwave desulfurization and its influencing factors[J].Coal Preparation Technology,2014(6):7-10,14.
[16]TAO X,TANG L,XIE M,et al.Dielectric properties analysis of sulfur-containing models in coal and energy evaluation of their sulfur-containing bond dissociation in microwave field[J].Fuel,2016,181(10):1027-1033.
[17]MOULDER J M F,STICKLE W F W,SOBOL W F,et al.Handbook of x-ray photoelectron scopy[R].1992:220.
[18]刘松,张明旭,黄少飞.微波氢氧化钠联合脱硫及机理分析[J].煤炭转化,2016,39(1):92-96.LIU Song,ZHANG Mingxu,HUANG Shaofei.Combined desulfurization and mechanism analysis of microwave sodium hydroxide[J].Coal Conjinding Sinica,2016,39(1):92-96.
[19]许宁,陶秀祥,杨彦成.微波联合碱液煤炭脱硫研究[J].中国矿业,2015,24(4):117-120.XU Ning,TAO Xiuxiang,YANG Yancheng.Study on desulfurization of microwave combined with alkaline coal[J].China Mining Magazine,2015,24(4):117-120.
[20]熊飞,李文华,姜英.用熔融苛性碱脱除煤中硫分[J].煤炭转化,1993,16(1):67-75.XIONG Fei,LI Wenhua,JIANG Ying.Removal of sulfur from coal by melting caustic[J].Coal Conversion,1993,16(1):67-75.