CFB炉内脱硫石灰石的粒径分布及热分解行为
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摘要
基于流态化理论和脱硫机理,对破碎后的入炉石灰石、运行过程中的循环灰和飞灰进行粒径分析,得出粒径小于0.088mm的石灰石较难被旋风分离器有效捕捉,容易发生扬析,从而造成脱硫剂的浪费.采用热重分析方法和Coats-Redfern近似法重点研究粒径为0.088 mm～2.500mm石灰石的热分解特性和动力学.结果表明:粒径增大不利于石灰石分解反应的进行,粒径为0.088mm～0.450mm的石灰石具有较好的热分解特性;分解动力学结果表明,由粒径变化引起的石灰石颗粒内外温度变化对活化能无明显影响,但会对频率因子产生影响,这可能与小粒径增加了颗粒的比表面积有关.
Based on the fluidization theory and desulfurization mechanism,particle size analysis was taken to the crushed limestone in the furnace,the circulating ash and fly ash during operation.The results show that limestone of particle size less than 0.088 mm is difficult to be effectively captured by cyclone,which will be prone to elutriate and cause waste of desulfurizer.The thermogravimetric analysis method and Coats-Redfern approximate method are taken for a further study of decomposition characteristics and kinetics of limestone of 0.088 mm-2.500 mm particles.The results show that the increase of particle size is not conducive to the decomposition reaction of limestone,and limestone of 0.088 mm-0.450 mm particle size has better thermal decomposition characteristics.The kinetic curve fitting results show that activation energy do not change significantly with the decrease of the particle size,and frequency factor increase with the decrease of particle size.When the particle size decreases to a certain value,frequency factor begins to decrease.This may be related to the surface microstructure of limestone.
Based on the fluidization theory and desulfurization mechanism,particle size analysis was taken to the crushed limestone in the furnace,the circulating ash and fly ash during operation.The results show that limestone of particle size less than 0.088 mm is difficult to be effectively captured by cyclone,which will be prone to elutriate and cause waste of desulfurizer.The thermogravimetric analysis method and Coats-Redfern approximate method are taken for a further study of decomposition characteristics and kinetics of limestone of 0.088 mm-2.500 mm particles.The results show that the increase of particle size is not conducive to the decomposition reaction of limestone,and limestone of 0.088 mm-0.450 mm particle size has better thermal decomposition characteristics.The kinetic curve fitting results show that activation energy do not change significantly with the decrease of the particle size,and frequency factor increase with the decrease of particle size.When the particle size decreases to a certain value,frequency factor begins to decrease.This may be related to the surface microstructure of limestone.
引文
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[9]邹峥,俞建洪,何宏舟,等.石灰石粒度分布对燃用福建无烟煤CFB锅炉炉内脱硫的影响[J].工业锅炉,2003(1):20-23.ZOU Zheng,YU Jianhong,HE Hongzhou,et al.The Effects of Particle Size Distribution of Limestone on Desulfurization in CFB Boiler Firing Fujian Anthracite[J].Industrial Boiler,2003(1):20-23.
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[12]杨振森,刘彬,陈宁武,等.提高CFB锅炉炉内脱硫效率的试验研究[J].洁净煤技术,2012,18(6):72-75.YANG Zhensen,LIU Bin,CHEN Ningwu,et al.Experimental Research on Desulfurization Efficiency Improvement of CFB Boiler[J].Clean Coal Technology,2012,18(6):72-75.
[13]闫事忠,白鹭,刘晓飞.柱磨机在循环流化床炉内脱硫的应用研究[J].山西电力,2016(3):69-72.YAN Shizhong,BAI Lu,LIU Xiaofei.Application Research on Column Mill for Desulfurization of Circulating Fluidized Bed Boiler[J].Shanxi Electric Power,2016(3):69-72.
[14]李丽锋,张翼,张培华,等.CFB锅炉掺烧煤泥型煤深度脱硫及运行特性研究[J].煤炭技术,2015,34(1):327-330.LI Lifeng,ZHANG Yi,ZHANG Peihua,et al.CFB Boiler Blend Combustion Coal Slurry Briquette for Deep Desulfurization and Research on Operating Characteristics[J].Coal Technology,2015,34(1):327-330.
[15]王智微,吴晓玲.循环流化床锅炉物料分布特征分析[J].热电技术,2002(3):7-9.WANG Zhiwei,WU Xiaoling.Analysis of Material Distribution Characteristics of Circulating Fluidized Bed Boiler[J].Cogeneration Power Technology,2002(3):7-9.
[16]刘娇.火电厂干法脱硫工艺的石灰石性质研究[J].产业与科技论坛,2012,11(17):63.LIU Jiao.Study on the Properties of Limestone in Dry Desulfurization Process in Thermal Power Plants[J].Industrial and Science Tribune,2012,11(17):63.
[17]陈亮,王子铭,王春波.流化床锅炉内石灰石同时煅烧/硫化反应中煅烧动力学特性[J].化工学报,2017,68(12):4615-4624.CHEN Liang,WANG Ziming,WANG Chunbo.Limestone Calcination Kinetics in Simultaneous Calcination and Sulfation Under CFB Condition[J].CIESC Jorunal,2017,68(12):4615-4624.
[18]路春美,田园,王永征,等.贝壳和石灰石的最佳固硫反应温度与微观结构特性[J].工程热物理学报,2004,25(增刊1):199-202.LU Chunmei,TIAN Yuan,WANG Yongzheng,et al.The Optimal Desulfurization Temperature and the Microstructure Characteristics of Shell and Limestone[J].Journal of Engineering Thermophysics,2004,25(Supplement 1):199-202.
[19]许熟祥.磷铵生产中流化床冷却器操作气速范围的确定[J].磷肥与复肥,1999(4):24-26.XU Shuxiang.Selection of Gas Velocity of Fluidized-bed Cooler in DAP Production[J].Phosphate and Compound Fertilizer,1999(4):24-26.
[20]王樟茂.化学反应器的设计:流化床反应器的设计[J].云南化工,1996(3):56-59.WANG Zhangmao.Chemical Reactor Design:Fluid Bed Reactor Design[J].Yunnan Chemical Technology,1996(3):56-59.
[21]LI Xiangguo,LYU Yang,MA Baoguo,et al.Decomposition Kinetic Characteristics of Calcium Carbonate Containing Organic Acids by TGA[J].Arabian Journal of Chemistry,2017,10:1884-2018.
[22]许桂英,WATKINSON A P,ELLIS N,等.亚麻纤维热解动力学的“model free”法和Coats-Redfern模型拟合法研究[J].化工学报,2010,61(9):2480-2487.XU Guiying,WATKINSON A P,ELLIS N,et al.Kinetic Study on Thermal Decomposition of Flax Fibers with Model-free and Coats-Redfern Model Fitting Kinetic Approaches[J].CIESC Journal,2010,61(9):2480-2487.
[23]ELMAY Y,JEGUIRIM M,TROUVG,et al.Kinetic Analysis of Thermal Decomposition of Date Palm Residues Using Coats-Redfern Method[J].Energy Sources,2016,38(8):1117-1124.
[2]高明明,岳光溪,雷秀坚,等.循环流化床锅炉石灰石控制研究[J].动力工程学报,2014,34(10):759-764.GAO Mingming,YUE Guangxi,LEI Xiujian,et al.Research on Limestone Control of Circulating Fluidized Bed Boiler[J].Journal of Chinese Society of Power Engineering,2014,34(10):759-764.
[3]洪方明.燃烧福建无烟煤CFB锅炉石灰石炉内脱硫试验[J].煤气与热力,2011,31(7):4-9.HONG Fangming.Desulfurization Experiment with Limestone in CFB Boiler Burning Fujian Anthracite[J].Gas and Heat,2011,31(7):4-9.
[4]王颖聪.某330 MW机组循环流化床锅炉脱硫效率分析[J].热力发电,2015,44(9):109-112.WANG Yingcong.Analysis on Desulfurization Efficiency of a 330 MW Unit Circulating Fluidized Bed Boiler[J].Thermal Power Generation,2015,44(9):109-112.
[5]关心,郭洪涛,江来,等.喷钙与蒸汽回料脱硫在220t/h CFB锅炉中的应用[J].电站系统工程,2012,28(2):31-32.GUAN Xin,GUO Hongtao,JIANG Lai,et al.Application of FGD by Limestone Injection and Steam Recycled Material at 220t/h CFB[J].Power System Engineering,2012,28(2):31-32.
[6]何云龙,卢杰.喷钙脱硫温度区间分析及煅烧产物水合活性实验[J].哈尔滨理工大学学报,2006,11(3):44-46.HE Yunlong,LU Jie.The Temperature Range Analysis for the Injection of Finely Divided Limestone Powder and the Experiment on Hydration Activity of the Calcinated Product[J].Journal of Harbin University of Science and Technology,2006,11(3):44-46.
[7]殷文香,董晓红,张晓童.循环流化床锅炉脱硫效率分析[J].内蒙古电力技术,2009,27(增刊1):47-49.YIN Wenxiang,DONG Xiaohong,ZHANG Xiaotong.Analysis of Desulfuration Efficiency to Circulating Fluidized Bed Boiler[J].Inner Mongolia Electric Power,2009,27(Supplement 1):47-49.
[8]赛汉胡尔,姚婕.循环硫化床锅炉脱硫率主要影响因素[J].北方环境,2013,29(1):103-105.SAI Hanhuer,YAO Jie.A Discussion on the Main Factors Affecting the Desulfurization Rate of the Fluidized Boiler[J].Northern Environment,2013,29(1):103-105.
[9]邹峥,俞建洪,何宏舟,等.石灰石粒度分布对燃用福建无烟煤CFB锅炉炉内脱硫的影响[J].工业锅炉,2003(1):20-23.ZOU Zheng,YU Jianhong,HE Hongzhou,et al.The Effects of Particle Size Distribution of Limestone on Desulfurization in CFB Boiler Firing Fujian Anthracite[J].Industrial Boiler,2003(1):20-23.
[10]赵鹏勃,王鹏利,王海涛,等.不同粒径石灰石的脱硫效率试验研究[J].内蒙古电力技术,2010,28(5):24-26.ZHAO Pengbo,WANG Pengli,WANG Haitao,et al.Desulfurization Efficiency Test and Study on Different Particle Size[J].Inner Mongolia Electric Power,2010,28(5):24-26.
[11]何宏舟,骆仲泱,邹峥,等.CFB锅炉燃烧福建无烟煤的工业性试验[J].煤炭转化,2003,26(3):68-72.HE Hongzhou,LUO Zhongyang,ZOU Zheng,et al.An Industrial Experiment Study on the Desulfurization of Fujian Anthracite During Combustion in Circulation Fluidized Bed Boiler[J].Coal Conversion,2003,26(3):68-72.
[12]杨振森,刘彬,陈宁武,等.提高CFB锅炉炉内脱硫效率的试验研究[J].洁净煤技术,2012,18(6):72-75.YANG Zhensen,LIU Bin,CHEN Ningwu,et al.Experimental Research on Desulfurization Efficiency Improvement of CFB Boiler[J].Clean Coal Technology,2012,18(6):72-75.
[13]闫事忠,白鹭,刘晓飞.柱磨机在循环流化床炉内脱硫的应用研究[J].山西电力,2016(3):69-72.YAN Shizhong,BAI Lu,LIU Xiaofei.Application Research on Column Mill for Desulfurization of Circulating Fluidized Bed Boiler[J].Shanxi Electric Power,2016(3):69-72.
[14]李丽锋,张翼,张培华,等.CFB锅炉掺烧煤泥型煤深度脱硫及运行特性研究[J].煤炭技术,2015,34(1):327-330.LI Lifeng,ZHANG Yi,ZHANG Peihua,et al.CFB Boiler Blend Combustion Coal Slurry Briquette for Deep Desulfurization and Research on Operating Characteristics[J].Coal Technology,2015,34(1):327-330.
[15]王智微,吴晓玲.循环流化床锅炉物料分布特征分析[J].热电技术,2002(3):7-9.WANG Zhiwei,WU Xiaoling.Analysis of Material Distribution Characteristics of Circulating Fluidized Bed Boiler[J].Cogeneration Power Technology,2002(3):7-9.
[16]刘娇.火电厂干法脱硫工艺的石灰石性质研究[J].产业与科技论坛,2012,11(17):63.LIU Jiao.Study on the Properties of Limestone in Dry Desulfurization Process in Thermal Power Plants[J].Industrial and Science Tribune,2012,11(17):63.
[17]陈亮,王子铭,王春波.流化床锅炉内石灰石同时煅烧/硫化反应中煅烧动力学特性[J].化工学报,2017,68(12):4615-4624.CHEN Liang,WANG Ziming,WANG Chunbo.Limestone Calcination Kinetics in Simultaneous Calcination and Sulfation Under CFB Condition[J].CIESC Jorunal,2017,68(12):4615-4624.
[18]路春美,田园,王永征,等.贝壳和石灰石的最佳固硫反应温度与微观结构特性[J].工程热物理学报,2004,25(增刊1):199-202.LU Chunmei,TIAN Yuan,WANG Yongzheng,et al.The Optimal Desulfurization Temperature and the Microstructure Characteristics of Shell and Limestone[J].Journal of Engineering Thermophysics,2004,25(Supplement 1):199-202.
[19]许熟祥.磷铵生产中流化床冷却器操作气速范围的确定[J].磷肥与复肥,1999(4):24-26.XU Shuxiang.Selection of Gas Velocity of Fluidized-bed Cooler in DAP Production[J].Phosphate and Compound Fertilizer,1999(4):24-26.
[20]王樟茂.化学反应器的设计:流化床反应器的设计[J].云南化工,1996(3):56-59.WANG Zhangmao.Chemical Reactor Design:Fluid Bed Reactor Design[J].Yunnan Chemical Technology,1996(3):56-59.
[21]LI Xiangguo,LYU Yang,MA Baoguo,et al.Decomposition Kinetic Characteristics of Calcium Carbonate Containing Organic Acids by TGA[J].Arabian Journal of Chemistry,2017,10:1884-2018.
[22]许桂英,WATKINSON A P,ELLIS N,等.亚麻纤维热解动力学的“model free”法和Coats-Redfern模型拟合法研究[J].化工学报,2010,61(9):2480-2487.XU Guiying,WATKINSON A P,ELLIS N,et al.Kinetic Study on Thermal Decomposition of Flax Fibers with Model-free and Coats-Redfern Model Fitting Kinetic Approaches[J].CIESC Journal,2010,61(9):2480-2487.
[23]ELMAY Y,JEGUIRIM M,TROUVG,et al.Kinetic Analysis of Thermal Decomposition of Date Palm Residues Using Coats-Redfern Method[J].Energy Sources,2016,38(8):1117-1124.