制备工艺对民用型焦抗压强度及燃烧性能与污染物排放特性的影响
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摘要
以无烟煤煤末为主要原料,制备了高强度的民用型焦;研究了黏结剂配比和炭化温度对型焦抗压强度、燃烧性能和污染物排放特性的影响规律;通过扫描电子显微镜(SEM)观察了型焦结构的变化;利用热质联用仪(TG-MS)测试了型焦的燃烧性能和污染物排放特性。结果表明:实验条件下黏结剂的最佳配比为4%(质量分数,下同)腐植酸钠、2%羧甲基纤维素钠、2%沥青。随着炭化温度的升高,型焦的抗压强度和发热量不断提高,可燃性、燃尽特性和综合燃烧特性不断变差。燃烧时NO的释放量随着炭化温度的升高先减小后增大,炭化温度为700℃时,型焦燃烧NO的释放量最低。SO_2的释放量随着炭化温度的升高不断增加,炭化温度为600℃时,型焦燃烧SO_2的释放量最低。
Civilian formed coke with high strength was prepared using anthracite powder as the main raw material.The effects of binder addition and carbonization temperature on the mechanical strength,combustion performance and pollutant emission characteristics of the coke were studied.The scanning electron microscopy(SEM)was adopted to analyze the change of the coke microstructure,and the combustion performance and pollutant emission characteristics of the coke were measured by thermogravimetry-mass spectrum(TG-MS)analysis.The results show that the optimal proportion of the binder is 4%(mass fraction,the same below)of sodium humate,2% of sodium carboxymethyl cellulose and 2% of asphalt.With the increase of the carbonization temperature,the mechanical strength and the calorific value of the coke are continuously increasing,and the flammability,the burn-out characteristics and the comprehensive combustion characteristics get worse.The amount of NO release while combustion decreases first and then increases with the increasing carbonization temperature.The coke at carbonization temperature of 700℃ has the lowest emission of NO.The emission of SO_2 increases with the increase of carbonization temperature,and the coke at carbonization temperature of 600 ℃ has the lowest emission of SO_2.
Civilian formed coke with high strength was prepared using anthracite powder as the main raw material.The effects of binder addition and carbonization temperature on the mechanical strength,combustion performance and pollutant emission characteristics of the coke were studied.The scanning electron microscopy(SEM)was adopted to analyze the change of the coke microstructure,and the combustion performance and pollutant emission characteristics of the coke were measured by thermogravimetry-mass spectrum(TG-MS)analysis.The results show that the optimal proportion of the binder is 4%(mass fraction,the same below)of sodium humate,2% of sodium carboxymethyl cellulose and 2% of asphalt.With the increase of the carbonization temperature,the mechanical strength and the calorific value of the coke are continuously increasing,and the flammability,the burn-out characteristics and the comprehensive combustion characteristics get worse.The amount of NO release while combustion decreases first and then increases with the increasing carbonization temperature.The coke at carbonization temperature of 700℃ has the lowest emission of NO.The emission of SO_2 increases with the increase of carbonization temperature,and the coke at carbonization temperature of 600 ℃ has the lowest emission of SO_2.
引文
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[23]ZHOU Junhu,FANG Lei,CHENG Jun,et al.Dynamic Sulfur Emission Derived from Combustion of Blends Coal Liquefaction Residual and Lignite Blends[J].Journal of Zhejiang University(Engineering Science),2006,40:131-134.
[2]陈鹏,杜文广,杨颂,等.煤基清洁燃料替代民用散烧原煤的研究进展[J].现代化工,2017,37(6):48-52.CHEN Peng,DU Wenguang,YANG Song,et al.Research Progress on Coal-based Clean Fuels Replacing Civil Scattered Burning Coal[J].Modern Chemical Industry,2017,37(6):48-52.
[3]WOLDE-RUFAEL Y.Coal Consumption and Economic Growth Revisited[J].Applied Energy,2010,87(1):160-167.
[4]WANG Qiang,LI Rongrong.Journey to Burning Half of Global Coal:Trajectory and Drivers of China’s Coal Use[J].Renewable and Sustainable Energy Reviews,2016,58:341-346.
[5]赵玉良,王宇航,徐永华,等.替代散烧煤的型焦制备技术和设备选型分析[J].煤炭加工与综合利用,2017(1):7-11.ZHAO Yuliang,WANG Yuhang,XU Yonghua,et al.Analysis of Preparation Technology and Equipment Selection of Formed Coke for Substituting Spent Coal[J].Coal Processing and Comprehensive Utilization,2017(1):7-11.
[6]张玉君,王长秀.一种无烟煤型焦洁净生产技术[J].洁净煤技术,2001,7(1):38-40.ZHANG Yujun,WANG Changxiu.A Cleaned Production Technology of Anthracite Formed Coke[J].Clean Coal Technology,2001,7(1):38-40.
[7]苗文华,林红,张旭辉.兰炭型焦用于民用燃料的研究[J].煤炭加工与综合利用,2016(8):65-68.MIAO Wenhua,LIN Hong,ZHANG Xuhui.Study of Formed Coke for Domestic Fuel[J].Coal Processing and Comprehensive Utilization,2016(8):65-68.
[8]王燕芳.黏结剂对无烟粉煤型焦质量的影响[J].煤炭转化,2000,23(2):42-46.WANG Yanfang.The Effect of Binder on the Quality of Anthracite Formed Coke[J].Coal Conversion,2000,23(2):42-46.
[9]陈娟,刘皓,李健,等.低变质粉煤的玉米秸秆型煤黏结剂的研究[J].中国煤炭,2017,43(4):105-108.CHEN Juan,LIU Hao,LI Jian,et al.Research on Corn Stalk Briquette Binder of Low Metamorphic Pulverized Coals[J].China Coal,2017,43(4):105-108.
[10]王燕芳,高晋生,吴春来,等.工艺条件对型焦质量的影响[J].煤炭转化,1998,21(4):29-33.WANG Yanfang,GAO Jinsheng,WU Chunlai,et al.Influence of Technological Conditions on the Quality of Formed Cokes[J].Coal Conversion,1998,21(4):29-33.
[11]杨永斌,钟强,姜涛,等.煤沥青型焦制备与固结机理[J].中南大学学报(自然科学版),2016,47(7):2181-2188.YANG Yongbin,ZHONG Qiang,JIANG Tao,et al.Preparation and Mechanism of Formed Coke with Coal Tar Pitch as Binder[J].Journal of Central South University(Science and Technology),2016,47(7):2181-2188.
[12]张玉君,王继伟,刘定桦.用陕北半焦粉生产气化型焦的试验研究[J].煤炭工程,2015,47(10):119-121.ZHANG Yujun,WANG Jiwei,LIU Dinghua.Experimental Study on Making Gasified Formed-coke with Semi-coke Powder from Northern Shaanxi[J].Coal Engineering,2015,47(10):119-121.
[13]郭云飞,张永发,赵钰琼,等.无烟粉煤制炭化型煤的炭化黏结特性研究[J].煤炭科学技术,2016,44(8):208-213.GUO Yunfei,ZHANG Yongfa,ZHAO Yuqiong,et al.Study on Carbonized Bonding Features of Carbonized Briquette Prepared with Anthracite Powder[J].Coal Science and Technology,2016,44(8):208-213.
[14]艾沙江·斯拉木,王永刚,林雄超,等.三道岭兰炭粉制备冶炼用型焦的工艺研究[J].煤炭转化,2016,39(2):51-58.AI Shajiang·SIlamu,WANG Yonggang,LIN Xiongchao,et al.Study on Process of Molding Metallurgical Coke Formed by Sandaoling Blue-coke Powder[J].Coal Conversion,2016,39(2):51-58.
[15]李会玲.型煤黏结剂研究进展[J].山东化工,2016,45(9):38-41.LI Huiling.Research Progress of Briquette Binder[J].Shandong Chemical Industry,2016,45(9):38-41.
[16]凌向阳,黄光许,王泽东.黏结剂各组分对型煤特性的影响研究[J].中国煤炭,2008(11):79-81.LING Xiangyang,HUANG Guangxu,WANG Zedong.Study on the Influence of Various Cementing Agent Components to Briquette Characteristics[J].China Coal,2008(11):79-81.
[17]董爱霞,张守玉,王健,等.煤焦燃烧特性及反应活性探究[J].洁净煤技术,2013,19(1):87-91.DONG Aixia,ZHANG Shouyu,WANG Jian,et al.Combustion Performance and Reaction Activity of Coal Char[J].Clean Coal Technology,2013,19(1):87-91.
[18]何红亮.白音华褐煤半焦与生物质成型及其燃烧特性研究[D].大连:大连理工大学,2013.HE Hongliang.Briquetting of Baiyinhua Lignite Char with Biomass and Its Combustion Characteristics[D].Dalian:Dalian University of Technology,2013.
[19]杜瑞岭.半焦的形成过程及其与煤粉混合燃烧的动力学研究[D].北京:北京科技大学,2017.DU Ruiling.Kinetic Study of Semi-coke Forming Process and Co-combustion with Pulverized Coal[D].Beijing:University of Science and Technology Beijing,2017.
[20]贺新福,吴红菊,杨蕾,等.生物质型煤热解半焦的燃烧特性研究[J].化学工程,2017,45(2):61-67.HE Xinfu,WU Hongju,YANG Lei,et al.Combustion Characteristics of Bio-briquette Pyrolysis Semi-char[J].Chemical Engineering(China),2017,45(2):61-67.
[21]王军辉.影响煤炭发热量的因素研究[D].杭州:浙江工业大学,2015.WANG Junhui.Research on Factors Affecting Coal Calorific Value[D].Hangzhou:Zhejiang University of Technology,2015.
[22]赵宗彬,陈皓侃,李保庆.煤燃烧过程中NOx的生成和还原[J].煤炭转化,1999,22(4):10-15.ZHAO Zongbin,CHEN Haokan,LI Baoqing.The Formation and Reduction of NOx During Coal Combustion[J].Coal Conversion,1999,22(4):10-15.
[23]ZHOU Junhu,FANG Lei,CHENG Jun,et al.Dynamic Sulfur Emission Derived from Combustion of Blends Coal Liquefaction Residual and Lignite Blends[J].Journal of Zhejiang University(Engineering Science),2006,40:131-134.
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