热重法研究逐级脱矿对褐煤燃烧特性的影响
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摘要
以胜利褐煤和昭通褐煤为研究对象,采用H_2O、HCl/CH_3COONH_4及CH_3COONH_4/HCl/HF对褐煤进行逐级脱矿处理,利用XRF、XRD和SEM对褐煤中的矿物质种类、含量及其形貌进行分析,采用热重法对比分析了脱矿前后煤样的燃烧特性及动力学反应过程,分析了矿物质对褐煤燃烧特性的影响。结果表明:两种褐煤中的主要矿物元素为Si、Al、Fe、S及碱/碱土金属元素,主要矿物组成为石英、高岭石、云母、石膏、方解石和黄铁矿;3种脱矿方式的矿物质脱除率分别为:胜利褐煤1.22%、32.49%、97.90%,昭通褐煤0.47%、26.41%、94.79%;原煤及脱矿煤的综合燃烧指数S的大小顺序为:原煤 In this work,the two typical Chinese low rank coals,Shengli lignite and Zhaotong lignite were demineralized by H_2O,HCl/CH_3COONH_4,CH_3COONH_4/HCl/HF solution step by step. The elemental composition and surface structures were tested using XRF,XRD and SEM,respectively. The combustion characteristics and the kinetics of the reaction process of raw lignite and treated lignite were investigated by thermogravimetry(TG). The results showed that the coal ash mainly consisted of silicon,aluminium,ferrum,sulphur and the alkali/alkaline earth metal sodium(AAEMs). There are mainly six types of minerals existing in two lignite,including quartz,kaolinite,muscovite,gypsum,calcite and pyrite. The three removal rates of minerals of Shengli and Zhaotong lignite were as follows:1.22%,32.49%,97.90% and 0.47%,26.41% and 94.79%,respectively. The combustion comprehensive index(S)followed in the order: row lignite
引文
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[11]刘敬,王智化,项飞鹏,等.准东煤中碱金属的赋存形式及其在燃烧过程中的迁移规律实验研究[J].燃料化学学报,2014,42(3):316-322LIU J,WANG Z H,XIANG F P,et al.Modes of occurrence and transformation of alkali metals in Zhundong coal during combustion[J].Journal of Fuel Chemistry and Technology,2014,42(3):316-322.
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[13]徐建,章祥林,靳廷甲.Fe2O3和K2CO3对高灰分煤催化燃烧影响及机理分析[J].硅酸盐通报,2016,35(6):1842-1846.XU J,ZHANG X L,JIN T J.Effect of Fe2O3 and K2CO3 on combustion and catalytic mechanism analysis of high ash coal from Huaibei Mining area[J].Bulletin of the Chinese Ceramic Society,2016,35(6):1842-1846.
[14]刘大海,张守玉,涂圣康,等.五彩湾煤中的钠在燃烧过程中的迁移释放规律[J].化工进展,2015,34(3):705-708.LIU D H,ZHANG S Y,TU S K,et al.Transformation and release of sodium in Wucaiwan coal during combustion[J].Chemical Industry and Engineering Progress,2015,34(3):705-708.
[15]王晓雷.混煤热解燃烧特性的试验研究[D].北京:华北电力大学,2003.WANG X L.An experimental study on the pyrolysis and combustion characterictics of blended coals[D].Beijing:North China Electric Power University,2003.
[16]ELBEYLI I Y,PSIKIN S.Combustion and pyrolysis characteristics of tunblek lignite[J].Journal of Thermal Analysis and Calorimetry,2006,83(3):721-726.
[17]HENGEL T D,WALKER P L.Catalysis of lignite char gasification by exchangeable calcium and magnesium:The Chemistry of Low-Rank Coals[M].ACS Publications,1984:267-273.
[18]马保国,徐立,李相国,等.碱/碱土金属盐对高灰分煤粉燃烧的催化作用[J].煤炭科学技术,2007,35(9):69-72.MA B G,XU L,LI X G,et al.Catalysis of alkali/alkali-earth metal salt on combustion behavior of high ash coal[J].Coal Science and Technology,2007,35(9):69-72.
[19]陈凡敏,王嘉瑞,赵冰,等.煤中矿物质对灰熔融和燃烧特性的影响[J].燃料化学学报,2015,43(1):27-33.CHEN F M,WANG J R,ZHAO B,et al.Effect of mineral form in coal on combustion characteristics and fusibility of coal ash[J].Journal of Fuel Chemistry and Technology,2015,43(1):27-33.
[20]张骁博,赵虹,杨建国.不同粒径煤粉煤质变化及燃烧特性研究[J].煤炭学报,2011,36(6):999-1003.ZHANG X B,ZHAO H,YANG J G.Study on the variation of coal properties for different coal diameters and its effects on combustion characteristics[J].Journal of China Coal Society,2011,36(6):999-1003.
[21]吕帅,吕国钧,蒋旭光,等.印尼褐煤湿煤末(煤泥)热解和燃烧特性及动力学分析[J].煤炭学报,2014,39(3):554-561.LüS,LüG J,JIANG X G,et al.Pyrolysis/combustion characteristics and kinetic analysis of Indonesia lignite sludge[J].Journal of China Coal Society,2014,39(3):554-561.
[22]滕英跃,宋银敏,李阳,等.胜利褐煤半焦显微结构及其燃烧反应性能[J].煤炭学报,2015,40(2):456-462.TENG Y Y,SONG Y M,LI Y,et al.Microscopic structures of semi-coke of Shengli lignite and its combustion reactivity[J].Journal of China Coal Society,2015,40(2):456-462.
[23]付子文,王长安,翁青松,等.水洗对准东煤煤质特性影响的实验研究[J].西安交通大学学报,2014,48(3):54-60.FU Z W,WANG C A,WONG Q S,et al.Experimental investigation for effect of water washing on zhundong coal properties[J].Journal of Xi’an Jiaotong University,2014,48(3):54-60.
[24]李华,林器.碱金属、碱土金属和过渡金属对煤的催化氧化作用[J].大连理工大学学报,1989,29(3):289-294.LI H,LIN Q.Effect of alkali/alkali-earth and transition metals on catalytic oxidation of coals[J].Journal of Dalian University of Technology,1989,29(3):289-294.
[25]JIINTGEN H,HEEK K H.Kinetics and mechanism of catalytic gasification of coal[J].American Chemical Society Division of Fuel Chemistry Preprints,1984,29(2):195-205.
[2]张锦萍,李冬,张成,等.低温热提质褐煤的理化结构演化及燃烧特性[J].煤炭学报,2015,40(3):671-677.ZHANG J P,LI D,ZHANG C,et al.Physical/chemical structure evolution and combustion characteristics of mildthermally upgraded lignite[J].Journal of China Coal Society,2015,40(3):671-677.
[3]尚晓玲,武建军,张一昕,等.脱水褐煤中矿物质对复吸性能的影响[J].中国矿业大学学报,2014,43(6):1102-1107.SHANG X L,WU J J,ZHANG Y X,et al.Effect of mineral content on moisture re-adsorption of dewatered lignite[J].Journal of China University of Mining&Technology,2014,43(6):1102-1107.
[4]SI C D,WU J J,WANG Y,et al.Effect of acoustic field on minimum fluidization velocity and drying characteristics of lignite in a fluidized bed[J].Fuel Processing Technology,2015,135:112-118.
[5]ZHANG Y X,WU J J,MA J,et al.Study on lignite dewatering by vibration mechanical thermal expression process[J].Fuel Processing Technology,2015,130:101-106.
[6]冯莉,于晓慧,刘祥春,等.除灰处理对胜利褐煤的结构及燃烧特性的影响[J].中国矿业大学学报,2015,44(2):319-325.FENG L,YU X H,LIU X C,et al.Effects of ash removal on the structure and combustion characteristics of Shengli lignite[J].Journal of China University of Mining&Technology,2015,44(2):319-325.
[7]王世昌.中国典型褐煤的挥发分发热量分布规律分析[J].内蒙古电力技术,2011,29(6):9-13.WANG S C.Analysis on distribution regularities for volatile constituent calorific value of typical lignite coal in china[J].Inner Mongolia Electric Power,2011,29(6):9-13.
[8]陈川,张守玉,刘大海,等.新疆高钠煤中钠的赋存形态及其对燃烧过程的影响[J].燃料化学学报,2013,41(7):832-838.CHEN C,ZHANG S Y,LIU D H,et al.Existence form of sodium in high sodium coals from Xinjiang and its effect on combustion process[J].Journal of Fuel Chemistry and Technology,2013,41(7):832-838.
[9]于敦喜,徐明厚,姚洪,等.煤燃烧中无机矿物向颗粒物的转化规律[J].工程热物理学报,2008,29(3):507-510YU D X,XU M H,YAO H,et al.Transformation of inorganic minerals into particulate matter during coal combustion[J].Journal of Engineering Thermophysics,2008,29(3):507-510.
[10]张洪.矿物质对煤粉燃烧特性和反应动力学影响的研究[J].中国矿业大学学报,2009,38(3):455-456.ZHANG H.Study on the influence of mineral matters on the combustion characteristics and kinetics of pulverized coals[J].Journal of China University of Mining&Technology,2009,38(3):455-456.
[11]刘敬,王智化,项飞鹏,等.准东煤中碱金属的赋存形式及其在燃烧过程中的迁移规律实验研究[J].燃料化学学报,2014,42(3):316-322LIU J,WANG Z H,XIANG F P,et al.Modes of occurrence and transformation of alkali metals in Zhundong coal during combustion[J].Journal of Fuel Chemistry and Technology,2014,42(3):316-322.
[12]SHANG X L,HOU K,WU J J,et al.The influence of mineral matter on moisture adsorption property of Shengli lignite[J].Fuel,2016,182:749-753.
[13]徐建,章祥林,靳廷甲.Fe2O3和K2CO3对高灰分煤催化燃烧影响及机理分析[J].硅酸盐通报,2016,35(6):1842-1846.XU J,ZHANG X L,JIN T J.Effect of Fe2O3 and K2CO3 on combustion and catalytic mechanism analysis of high ash coal from Huaibei Mining area[J].Bulletin of the Chinese Ceramic Society,2016,35(6):1842-1846.
[14]刘大海,张守玉,涂圣康,等.五彩湾煤中的钠在燃烧过程中的迁移释放规律[J].化工进展,2015,34(3):705-708.LIU D H,ZHANG S Y,TU S K,et al.Transformation and release of sodium in Wucaiwan coal during combustion[J].Chemical Industry and Engineering Progress,2015,34(3):705-708.
[15]王晓雷.混煤热解燃烧特性的试验研究[D].北京:华北电力大学,2003.WANG X L.An experimental study on the pyrolysis and combustion characterictics of blended coals[D].Beijing:North China Electric Power University,2003.
[16]ELBEYLI I Y,PSIKIN S.Combustion and pyrolysis characteristics of tunblek lignite[J].Journal of Thermal Analysis and Calorimetry,2006,83(3):721-726.
[17]HENGEL T D,WALKER P L.Catalysis of lignite char gasification by exchangeable calcium and magnesium:The Chemistry of Low-Rank Coals[M].ACS Publications,1984:267-273.
[18]马保国,徐立,李相国,等.碱/碱土金属盐对高灰分煤粉燃烧的催化作用[J].煤炭科学技术,2007,35(9):69-72.MA B G,XU L,LI X G,et al.Catalysis of alkali/alkali-earth metal salt on combustion behavior of high ash coal[J].Coal Science and Technology,2007,35(9):69-72.
[19]陈凡敏,王嘉瑞,赵冰,等.煤中矿物质对灰熔融和燃烧特性的影响[J].燃料化学学报,2015,43(1):27-33.CHEN F M,WANG J R,ZHAO B,et al.Effect of mineral form in coal on combustion characteristics and fusibility of coal ash[J].Journal of Fuel Chemistry and Technology,2015,43(1):27-33.
[20]张骁博,赵虹,杨建国.不同粒径煤粉煤质变化及燃烧特性研究[J].煤炭学报,2011,36(6):999-1003.ZHANG X B,ZHAO H,YANG J G.Study on the variation of coal properties for different coal diameters and its effects on combustion characteristics[J].Journal of China Coal Society,2011,36(6):999-1003.
[21]吕帅,吕国钧,蒋旭光,等.印尼褐煤湿煤末(煤泥)热解和燃烧特性及动力学分析[J].煤炭学报,2014,39(3):554-561.LüS,LüG J,JIANG X G,et al.Pyrolysis/combustion characteristics and kinetic analysis of Indonesia lignite sludge[J].Journal of China Coal Society,2014,39(3):554-561.
[22]滕英跃,宋银敏,李阳,等.胜利褐煤半焦显微结构及其燃烧反应性能[J].煤炭学报,2015,40(2):456-462.TENG Y Y,SONG Y M,LI Y,et al.Microscopic structures of semi-coke of Shengli lignite and its combustion reactivity[J].Journal of China Coal Society,2015,40(2):456-462.
[23]付子文,王长安,翁青松,等.水洗对准东煤煤质特性影响的实验研究[J].西安交通大学学报,2014,48(3):54-60.FU Z W,WANG C A,WONG Q S,et al.Experimental investigation for effect of water washing on zhundong coal properties[J].Journal of Xi’an Jiaotong University,2014,48(3):54-60.
[24]李华,林器.碱金属、碱土金属和过渡金属对煤的催化氧化作用[J].大连理工大学学报,1989,29(3):289-294.LI H,LIN Q.Effect of alkali/alkali-earth and transition metals on catalytic oxidation of coals[J].Journal of Dalian University of Technology,1989,29(3):289-294.
[25]JIINTGEN H,HEEK K H.Kinetics and mechanism of catalytic gasification of coal[J].American Chemical Society Division of Fuel Chemistry Preprints,1984,29(2):195-205.
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