燃烧温度对粉煤灰理化特性及脱硫潜力的影响  

Effect of combustion temperature on physico-chemical properties and desulphurization potentiality of fly ash

作　　者：于清航 徐振刚 李婷 李慧 梁兴 YU Qinghang;XU Zhengang;LI Ting;LI Hui;LIANG Xing(School of Chemical and Environmental Engineering, China University of Mining and Technology （Beijing） , Belting 100083, China;China Coal Research Institute , Beifing 100013, China;Coal Chemical Research Institute, China National Coal Group Co., Ltd., Beifing 100120, China)

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]煤炭科学技术研究院有限公司,北京100013 [3]中煤能源集团有限公司煤化工研究院,北京100120

出　　处：《煤炭科学技术》2018年第3期200-205,共6页Coal Science and Technology

基　　金：北京市科技计划重大科技成果转化落地培育资助项目(Z161100004816012)

摘　　要：为了获得高脱硫活性的粉煤灰,采用滴管炉试验装置,结合扫描电子显微镜、粒度分析仪、X射线衍射仪、X射线光电子能谱仪及化学滴定等测试仪器和方法,对不同燃烧温度所获得粉煤灰的物相形貌、化学组成和活性氧化钙含量等特性进行了研究,探究了煤粉燃烧温度对粉煤灰特性的影响规律。结果表明:燃烧温度对粉煤灰物相形貌、化学形态、固硫率及活性氧化钙含量均有显著影响,随温度升高,不规则形态颗粒的数量逐步减小,颗粒尺寸微增,CaO和Ca(OH)_2含量逐渐增加,烟气中SO_2排放浓度呈现先升高后平缓的趋势,活性氧化钙含量逐渐增高,可有效提高粉煤灰作为脱硫剂的脱硫潜力。综合分析,燃烧温度800℃左右为煤粉最佳燃烧工况。In order to obtain fly ash with high desulfurization activity,in combination with scanning electron microscope（ SEM）,particle size analyzer,X-ray diffractometer（ XRD）,X-ray photoelectron spectrometer（ XPS）,chemical titration and other characterization methods,the dropper tube furnace was used to study the phase morphology,chemical components of fly ash and active CaO content obtained from pulverized coal combustion with different combustion temperatures. The influence law of coal combustion temperature on the characteristics of fly ash was investigated. The results showed that the combustion temperature had significantly affected on the phase morphology of fly ash,chemical composition,sulfur fixation rate and the content of active calcium oxide. With the temperature increased,the number of irregular shape particles gradually decreased,and particle size increased,the contents of CaO and Ca（OH）_2 increased,the content of SO_2 showed a trend of rise before they were gentle,the content of active calcium oxide increased gradually,which could effectively improve the fly ash as desulfurizer desulfurization of potential. By comprehensive analysis,the temperature about 800 ℃ was the best combustion conditions.

关 键 词：粉煤灰 脱硫潜力 滴管炉 固硫率 活性氧化钙 

分 类 号：TQ536[化学工程—煤化学工程]