原煤可磨性对气流床粉煤气化混配煤煤粉均匀程度的影响
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摘要
以气流床粉煤气化工业装置不同时期的两组进料煤粉为研究对象,在实验室按粒径对两组煤粉进行了筛分分组,对分组后子煤粉进行了煤质、煤灰特性及反应活性分析,研究了原煤可磨性差异对混配磨制后煤粉均匀程度的影响。结果表明,原煤可磨性对混煤煤粉的颗粒粒径分布及其均匀性均具有影响。混配磨制煤粉的粒径主要取决于原煤中可磨性指数较小的原煤,此原煤可磨性指数越小,煤粉颗粒粒径越大;可磨性相近的原煤混配制得的煤粉混合较均匀,可磨性差异较大的原煤混配煤粉混合不均,煤粉发生偏析,使得大颗粒煤粉中含有过多的难磨煤,导致煤粉的反应性能变差。
Two pulverized coals taken from an entrained-flowpulverized coal gasification unit at different operating periods were adopted as the experimental materials,which were divided into two groups based on the partical size to investigate the effect of rawcoal grindability on the uniformity of pulverized blended coal. The coal quality and the ash character of the subsamples were analyzed as well. The results showthat the grindability of rawcoal has a great influence on the partical size distribution and the uniformity of pulverized blended coal,and the partical size distribution of blended coal is mainly depended on the rawcoal with a smaller grindability index. The smaller the rawcoal's grindability index,the larger the particle size of the pulverized blended coal. It is therefore concluded that the pulverized blended coal made from similar grindability rawcoals is more uniform.On the other hand,different grindabilities of rawcoals lead to nonuniformity and segregation of the pulverized blended coal and induce an accumulation of hard coal in the large particles,which will cause the reactivity of the pulverized blended coal decrease.
Two pulverized coals taken from an entrained-flowpulverized coal gasification unit at different operating periods were adopted as the experimental materials,which were divided into two groups based on the partical size to investigate the effect of rawcoal grindability on the uniformity of pulverized blended coal. The coal quality and the ash character of the subsamples were analyzed as well. The results showthat the grindability of rawcoal has a great influence on the partical size distribution and the uniformity of pulverized blended coal,and the partical size distribution of blended coal is mainly depended on the rawcoal with a smaller grindability index. The smaller the rawcoal's grindability index,the larger the particle size of the pulverized blended coal. It is therefore concluded that the pulverized blended coal made from similar grindability rawcoals is more uniform.On the other hand,different grindabilities of rawcoals lead to nonuniformity and segregation of the pulverized blended coal and induce an accumulation of hard coal in the large particles,which will cause the reactivity of the pulverized blended coal decrease.
引文
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[8]张龙,黄镇宇,沈铭科,王智化,周俊虎.不同的灰熔点调控方式对煤灰熔融特性的影响[J].燃料化学学报,2015,43(2):145-152.(ZHANG Long,HUANG Zhen-yu,SHEN Ming-ke,WANG Zhi-hua,ZHOU Jun-hu.Effect of different regulative methods on coal ash fusion characteristics[J].J Fuel Chem Technol,2015,43(2):145-152.)
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[10]郝永财.基于煤质特性分析的混煤优化配比研究[D].武汉:华中科技大学,2008.(HAO Yong-cai.A study on optimal component ratio of coal blending based on coal quality characteristics analysis[D].Wuhan:Huazhong University of Science&Technology,2008.)
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[12]TAKAYUKI T,YASUKATSU T,AKIRA T.Reactivities of 34 coals under steam gasification[J].Fuel,1985,64(10):1438-1442.
[13]王玉磊,王庆文,贾建文,万金峰.混煤哈氏可磨度试验研究[J].节能技术,2012,30(2):179-181.(WANG Yu-lei,WANG Qing-wen,JIA Jian-wen,WAN Jin-feng.The experimental study of the HGI of blended coals[J].Energy Conserv Technol,2012,30(2):179-181.)
[14]姜秀民,李巨斌,邱捡荣.煤粉颗粒粒度对煤质分析特性与燃烧特性的影响[J].煤炭学报,1999,24(6):643-647.(JIANG Xiu-min,LI Ju-bin,QIU Jian-rong.The influence of particle size on compositions analyzing and combustion characteristics of pulverized coal[J].J China Coal Soc,1999,24(6):643-647.)
[15]张建中.混煤的可磨系数及高灰分原煤在磨煤机中出力降低系数确定方法的探讨[J].热机技术,2001,1:27-31.(ZHANG Jian-zhong.Discussion on the determination method of the grindability of blended coal and the determination method of the output reduction coefficient of high ash coal in the coal mill[J].Heat Pow er Technics,2001,1:27-31.)
[16]刘忠,阎维平,高正阳,赵莉.超细煤粉粒度对煤质分析特性的影响[J].华北电力大学学报,2004,31(4):63-65.(LIU Zhong,YAN Wei-ping,GAO Zheng-yang,ZHAO Li.Dependence of coal compositions on micro-pulverized coal fmeness[J].J North China Electr Pow er Univ,2004,31(4):63-65.)
[17]张德祥,龙永华,高晋生.煤灰中矿物的化学组成与灰熔融性的关系[J].华东理工大学学报,2003,29(6):590-594.(ZHANG De-xiang,LONG Yong-hua,GAO Jin-sheng.Relationship between the coal ash fusibility and its chemical composition[J].J East China Univ Sci Technol,2003,29(6):590-594.)
[18]许洁,刘霞,李德侠,周志杰,王辅臣,于广锁.煤灰流动温度预测模型的研究[J].燃料化学学报,2012,40(12):1415-1429.(XU Jie,LIU Xia,LI De-xia,ZHOU Zhi-jie,WANG Fu-chen,YU Guang-suo.Prediction model for flow temperature of coal ash[J].J Fuel Chem Technol,2012,40(12):1415-1429.)
[2]龚欣,郭晓镭,代正华,于遵宏.自主创新的气流床粉煤加压气化技术[J].大氮肥,2005,28(3):155-157.(GONG Xin,GUO Xiao-lei,DAI Zheng-hua,YU Zun-hong.The independently innovative gasification technology of pressurized entrainedflow for pulverized coal[J].Large Scale Nitrogenous Fert Ind,2005,28(3):155-157.)
[3]贺永德.现代煤化工技术手册[M].北京:化学工业出版社,2011.(HE Yong-de.Modern Coal Chemical Technology Handbook[M].Beijing:Chemical Industry Press,2011.)
[4]RILEY J T,GILLELAND S R,FORSYTHE R F,GRAHAM JR H D,HAYES F J.Non-additive analytical values for coal[C]//Proceedings of the seventh international conference on coal testing,Charleston,WV,USA,1989:645-649.
[5]钟德惠,丘纪华.可磨性对混煤燃烧特性的影响[J].电站系统工程,2003,19(2):13-14.(ZHONG De-hui,QIU Ji-hua.Impact of grinding behavior of blended coals on pulverized fuel combustion character[J].Power Syst Eng,2003,19(2):13-14.)
[6]HAAS J,TAMURA M,WEBER R.Characterisation of coal blends for pulverised fuel combustion[J].Fuel,2001,80:1317-1323.
[7]刘京燕,王长安,张晓明,孙云,车得福.混煤煤质及燃烧特性研究[J].锅炉技术,2012,43(2):37-42,46.(LIU Jing-yan,WANG Chang-an,ZHANG Xiao-ming,SUN Yun,CHE De-fu.Investigation on coal properties and combust ion characteristics of blended coals[J].Boiler Technol,2012,43(2):37-42,46.)
[8]张龙,黄镇宇,沈铭科,王智化,周俊虎.不同的灰熔点调控方式对煤灰熔融特性的影响[J].燃料化学学报,2015,43(2):145-152.(ZHANG Long,HUANG Zhen-yu,SHEN Ming-ke,WANG Zhi-hua,ZHOU Jun-hu.Effect of different regulative methods on coal ash fusion characteristics[J].J Fuel Chem Technol,2015,43(2):145-152.)
[9]乌晓江,张忠孝,周托,陈玉爽,陈国艳,陆成,黄凤豹.气化条件下混煤灰熔融特性及矿物质演变规律[J].燃烧科学与技术,2010,16(6):508-514.(WU Xiao-jiang,ZHANG Zhong-xiao,ZHOU Tuo,CHEN Yu-shuang,CHEN Guo-yan,LU Cheng,HUANG Feng-bao.Ash Fusion Characteristics and M ineral Evolvement of Biended Ash Under Gasification Condition[J].J Combust Sci Technol,2010,16(6):508-514.)
[10]郝永财.基于煤质特性分析的混煤优化配比研究[D].武汉:华中科技大学,2008.(HAO Yong-cai.A study on optimal component ratio of coal blending based on coal quality characteristics analysis[D].Wuhan:Huazhong University of Science&Technology,2008.)
[11]解维伟.煤化学与煤质分析[M].北京:冶金工业出版社,2012.(JIE Wei-wei.Coal Chemistry and Coal Quality Analysis[M].Beijing:Metallurgical Industry Press,2012.)
[12]TAKAYUKI T,YASUKATSU T,AKIRA T.Reactivities of 34 coals under steam gasification[J].Fuel,1985,64(10):1438-1442.
[13]王玉磊,王庆文,贾建文,万金峰.混煤哈氏可磨度试验研究[J].节能技术,2012,30(2):179-181.(WANG Yu-lei,WANG Qing-wen,JIA Jian-wen,WAN Jin-feng.The experimental study of the HGI of blended coals[J].Energy Conserv Technol,2012,30(2):179-181.)
[14]姜秀民,李巨斌,邱捡荣.煤粉颗粒粒度对煤质分析特性与燃烧特性的影响[J].煤炭学报,1999,24(6):643-647.(JIANG Xiu-min,LI Ju-bin,QIU Jian-rong.The influence of particle size on compositions analyzing and combustion characteristics of pulverized coal[J].J China Coal Soc,1999,24(6):643-647.)
[15]张建中.混煤的可磨系数及高灰分原煤在磨煤机中出力降低系数确定方法的探讨[J].热机技术,2001,1:27-31.(ZHANG Jian-zhong.Discussion on the determination method of the grindability of blended coal and the determination method of the output reduction coefficient of high ash coal in the coal mill[J].Heat Pow er Technics,2001,1:27-31.)
[16]刘忠,阎维平,高正阳,赵莉.超细煤粉粒度对煤质分析特性的影响[J].华北电力大学学报,2004,31(4):63-65.(LIU Zhong,YAN Wei-ping,GAO Zheng-yang,ZHAO Li.Dependence of coal compositions on micro-pulverized coal fmeness[J].J North China Electr Pow er Univ,2004,31(4):63-65.)
[17]张德祥,龙永华,高晋生.煤灰中矿物的化学组成与灰熔融性的关系[J].华东理工大学学报,2003,29(6):590-594.(ZHANG De-xiang,LONG Yong-hua,GAO Jin-sheng.Relationship between the coal ash fusibility and its chemical composition[J].J East China Univ Sci Technol,2003,29(6):590-594.)
[18]许洁,刘霞,李德侠,周志杰,王辅臣,于广锁.煤灰流动温度预测模型的研究[J].燃料化学学报,2012,40(12):1415-1429.(XU Jie,LIU Xia,LI De-xia,ZHOU Zhi-jie,WANG Fu-chen,YU Guang-suo.Prediction model for flow temperature of coal ash[J].J Fuel Chem Technol,2012,40(12):1415-1429.)