58 MW旋流煤粉锅炉炉内温度场模拟
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摘要
研究燃煤锅炉炉内温度场,对于合理改变锅炉运行工况从而提高锅炉效率具有重要意义。本文以某58 MW机组旋流煤粉锅炉为研究对象,根据锅炉的真实尺寸建立物理模型,通过现场试验数据验证了计算数据的可靠性;依据计算流体力学原理,利用合适的边界条件与合理的假设,对6种工况下锅炉炉内燃烧温度场进行数值求解,分析炉膛内的温度分布。结果表明,该型煤粉锅炉在80%负荷,内外二次风风量配比4:1的条件下运行状况最为理想。所得结果对燃煤工业锅炉在能效提高方面具有重要的参考价值。
Studying the temperature field in the furnace of a coal-fired boiler is of great significance to reasonably change the operating conditions of the boiler and improve the efficiency of the boiler. In this study, a58 MW swirling pulverized coal-fired boiler is taken as the research object. A physical model is established according to the actual size of the boiler, the reliability of the calculated data is verified by field test data. Based on the principle of computational fluid mechanics, the numerical solution of combustion temperature field in boiler furnace under 6 kinds of working conditions is carried out using appropriate boundary conditions and reasonable assumptions. And the temperature distribution of the furnace is analyzed. The result shows that, this type of pulverized coal-fired boiler operates optimally under the condition that the load rate is 80% and the ratio of internal and external secondary air volume is 4:1. The obtained results have important reference value for improving the energy efficiency of coal-fired industrial boilers.
Studying the temperature field in the furnace of a coal-fired boiler is of great significance to reasonably change the operating conditions of the boiler and improve the efficiency of the boiler. In this study, a58 MW swirling pulverized coal-fired boiler is taken as the research object. A physical model is established according to the actual size of the boiler, the reliability of the calculated data is verified by field test data. Based on the principle of computational fluid mechanics, the numerical solution of combustion temperature field in boiler furnace under 6 kinds of working conditions is carried out using appropriate boundary conditions and reasonable assumptions. And the temperature distribution of the furnace is analyzed. The result shows that, this type of pulverized coal-fired boiler operates optimally under the condition that the load rate is 80% and the ratio of internal and external secondary air volume is 4:1. The obtained results have important reference value for improving the energy efficiency of coal-fired industrial boilers.
引文
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[14]赵玲慧.边界层壁面特性的改变对大涡结构作用的数值研究[D].南京:南京信息工程大学,2012:71-80.ZHAO Linghui.Numerical study of the effect of boundary layer changes on the large vortex structures[D].Nanjing:Nanjing University of Information Science and Tech-nology,2012:71-80.
[15]方平治,顾明,谈建国,等.数值模拟大气边界层中解决壁面函数问题方法研究[J].振动与冲击,2015,34(2):85-90.FANG Pingzhi,GU Ming,TAN Jianguo,et al.Method to solve the wall function problem in simulation of atmospheric boundary layer[J].Journal of Vibration and Shock,2015,34(2):85-90.
[2]舟丹.中国“去煤化”暂时难以实现[J].中外能源,2016(2):86.ZHOU Dan.China’s“not coal”is temporarily difficult to achieve[J].Sino-Global Energy,2016(2):86.
[3]赵钦新.我国工业锅炉发展回顾与“十二五”展望[J].工业锅炉,2011(6):1-8.ZHAO Qinxin.Reviews and prospects in China’s industrial boiler development[J].Industrial Boiler,2011(6):1-8.
[4]曹阳.热力生产业层燃炉PM2.5产排特性的试验研究[D].哈尔滨:哈尔滨工业大学,2014:65-70.CAO Yang.Research on PM2.5 production and emission characteristics of layer burning boilers from heating-supply industry[D].Harbin:Harbin Institute of Technology,2014:65-70.
[5]牛莲静.大型发电机定子流场及温度场数值计算与分析[D].哈尔滨:哈尔滨理工大学,2013:41-50.NIU Lianjing.Calculation and analysis of flow field and temperature field in stator of large generator[D].Harbin:Harbin University of Science and Technology,2013:41-50.
[6]王芳,郭瑞倩,安志华,等.空冷发电机定子三维温度场分布与试验对比[J].电机与控制学报,2013,17(12):46-50.WANG Fang,GUO Ruiqian,AN Zhihua,et al.Air cooled generator stator temperature field distribution and experimental comparison[J].Electric Machines and Control,2013,17(12):46-50.
[7]闫军政.不同给煤方式下循环流化床锅炉燃烧特性的数值模拟研究[J].节能技术,2016,34(5):395-399.YAN Junzheng.Numerical simulation analysis of combustion characteristics of circulating fluidized bed boiler in different coal-feed way[J].Energy Conservation Technology,2016,34(5):395-399.
[8]刘爱忠.燃煤锅炉机组[M].北京:中国电力出版社,2003:119.LIU Aizhong.Coal fired boiler unit[M].Beijing:China Electric Power Press,2003:119.
[9]梁荣亮,过学迅.基于GAMBIT的网格生成技术浅析[EB/OL].[2008-01-24].http://www.paper.edu.cn/release paper/content/200801-721.LIANG Rongliang,GUO Xuexun.The superficial analysis of the grid generation technique based on Gambit[EB/OL].[2008-01-24].http://www.paper.edu.cn/release paper/content/200801-721.
[10]陈琪华.煤质特性对W型火焰锅炉燃烧影响的数值模拟研究[D].长沙:长沙理工大学,2011:89-90.CHEN Qihua.The research of numerical simulation on effect of coal characteristics on W-shaped boiler combustion[D].Changsha:Changsha University of Science and Technology,2011:89-90.
[11]陶文铨.数值传热学[M].2版.西安:西安交通大学出版社,2001:337-376.TAO Wenquan.Numerical heat transfer[M].2nd ed.Xi’an:Xi’an Jiaotong University press,2001:337-376.
[12]郑钢镖,康天合,柴肇云,等.运用Rosin-Rammler分布函数研究煤尘粒径分布规律[J].太原理工大学学报,2006,37(3):317-319.ZHENG Gangbiao,KANG Tianhe,CHAI Zhaoyun,et al.Applied the Rosin-Rammler distribution function to study on the law of coal dust particle-size distribution[J].Journal of Taiyuan University of Technology,2006,37(3):317-319.
[13]刘丽萍.四角切圆煤粉炉炉内燃烧及配风的数值模拟[D].大连:大连理工大学,2009:35-36.LIU Liping.Numerical simulation of combustion process and air distribution of tangentially pulverized coal-fired boiler[D].Dalian:Dalian University of Technology,2009:35-36.
[14]赵玲慧.边界层壁面特性的改变对大涡结构作用的数值研究[D].南京:南京信息工程大学,2012:71-80.ZHAO Linghui.Numerical study of the effect of boundary layer changes on the large vortex structures[D].Nanjing:Nanjing University of Information Science and Tech-nology,2012:71-80.
[15]方平治,顾明,谈建国,等.数值模拟大气边界层中解决壁面函数问题方法研究[J].振动与冲击,2015,34(2):85-90.FANG Pingzhi,GU Ming,TAN Jianguo,et al.Method to solve the wall function problem in simulation of atmospheric boundary layer[J].Journal of Vibration and Shock,2015,34(2):85-90.