火电厂锅炉自整流二次风调节阀研究
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摘要
火电厂锅炉绝大多数是采用煤粉燃烧的方式发电,二次风的配风调节影响着火和燃尽过程,而锅炉内燃烧过程的好坏直接关系到锅炉运行的经济性和可靠性。目前国内绝大多数火力发电厂使用普通翻板阀对二次风进行调节,而翻板阀的流量调节特性为快开特性并且阀后流场分布不均匀,影响了煤粉的充分燃烧。
本论文针对翻板阀存在的缺点,设计了一套新型二次风调节阀。首先通过数值模拟的方法,对翻板阀和新型二次风调节阀主要结构建模仿真,通过比较结果指出新型二次风调节阀在结构上的合理性。然后通过使用SolidWorks软件对新型二次风调节阀进行结构设计并做必要的分析。最后在实验室搭建实验台,通过实验验证了所设计的调节阀在流量调节特性和阀后流场分布都要优于翻板阀,实验结果表明该调节阀可以用来调节二次风。
论文最后针对火电厂中二次风风道尺寸不同的现状,需要设计尺寸不同的二次风调节阀来满足不同电厂锅炉的需求,建立了基于SolidWorks二次开发的特征零件库,实现了快速设计。
Most of the boilers generate electricity by burning pulverized coal in the thermal power plant. The adjustment of the secondary air is an important key during boiler burning process. The stand or fall of combustion process decides the efficiency & reliability of boilers operation directly. Now most of the domestic thermal power plants are using ordinary flap valve to adjust the secondary air, but the flow adjusting characteristic of flap valves is fast opening characteristic and the flow filed efflux from flap valve is uneven has influenced the fully burning of pulverized coal.
For the shortcomings of flap valve, this thesis designed a new type of secondary air control valve. First, by using numerical simulation method to build the model building for the main structure of flap valve and the new secondary air control valve, and by comparing the results, the new secondary air control valve is reasonable in the structure. Then do the structure design for the secondary air control valve using SolidWorks and do some necessary analysis. Finally, putting up a test-bed structure in laboratory, and through experiment, the new type of secondary air control valve is superior to the flap valve in both the flow adjusting characteristics of flap valves and the non-uniform of the flow filed distribution, and the experimental results show that the new type of secondary air control valve can be used for adjusting secondary air.
For different thermal power plant have different secondary air duct, finally, it is necessary to design many secondary air control valves with different size for different thermal power plant, so this thesis have built a characteristic parts library based on the secondary development of SolidWorks, and achieved rapid design.
本论文针对翻板阀存在的缺点,设计了一套新型二次风调节阀。首先通过数值模拟的方法,对翻板阀和新型二次风调节阀主要结构建模仿真,通过比较结果指出新型二次风调节阀在结构上的合理性。然后通过使用SolidWorks软件对新型二次风调节阀进行结构设计并做必要的分析。最后在实验室搭建实验台,通过实验验证了所设计的调节阀在流量调节特性和阀后流场分布都要优于翻板阀,实验结果表明该调节阀可以用来调节二次风。
论文最后针对火电厂中二次风风道尺寸不同的现状,需要设计尺寸不同的二次风调节阀来满足不同电厂锅炉的需求,建立了基于SolidWorks二次开发的特征零件库,实现了快速设计。
Most of the boilers generate electricity by burning pulverized coal in the thermal power plant. The adjustment of the secondary air is an important key during boiler burning process. The stand or fall of combustion process decides the efficiency & reliability of boilers operation directly. Now most of the domestic thermal power plants are using ordinary flap valve to adjust the secondary air, but the flow adjusting characteristic of flap valves is fast opening characteristic and the flow filed efflux from flap valve is uneven has influenced the fully burning of pulverized coal.
For the shortcomings of flap valve, this thesis designed a new type of secondary air control valve. First, by using numerical simulation method to build the model building for the main structure of flap valve and the new secondary air control valve, and by comparing the results, the new secondary air control valve is reasonable in the structure. Then do the structure design for the secondary air control valve using SolidWorks and do some necessary analysis. Finally, putting up a test-bed structure in laboratory, and through experiment, the new type of secondary air control valve is superior to the flap valve in both the flow adjusting characteristics of flap valves and the non-uniform of the flow filed distribution, and the experimental results show that the new type of secondary air control valve can be used for adjusting secondary air.
For different thermal power plant have different secondary air duct, finally, it is necessary to design many secondary air control valves with different size for different thermal power plant, so this thesis have built a characteristic parts library based on the secondary development of SolidWorks, and achieved rapid design.
引文
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[2]樊泉桂.锅炉原理.北京:中国电力出版社,2004:100
[3]Fleming Matthew M.Increasing boiler efficiency through balancing secondary air flow to burners.Proceedings of the American Power Conference,1996,2(58):1496-1500
[4]J H Kim.Analysis and modelling of solid flow in a closed loop circulating fluidized bed with secondary air injection.Power Technology,2000,111:179-185
[5]李石湘.二次风配风方式对燃烧优化的影响.湖南电力,2003,2(23):37-59
[6]徐金全.二次风喷嘴角度改变对燃烧的影响.节能,1992,11:25
[7]金燕.二次风速度对滞止浓缩过程的影响.电厂系统工程,2000,3(6):171-172
[8]汤志旭.抛煤机二次风改造.应用能源技术.,2000,2:18-19
[9]何英.75t/h立式旋风炉二次风速挡板调整方向的改造.黑龙江电力技术,1993,1(15):48-50
[10]朴万成.改进二次风提高燃烧效果.节能,1997,6:38-39
[11]胡建峰.SG-65/3.82机械风力抛煤链条炉二次风喷嘴布置的探讨.浙江节能,2003.3:36-39
[12]曹子栋.锅炉测试技术.西安交通大学出版社,1995:23
[13]赵永刚.电厂锅炉一二次风风速在线监测系统的研制.华北电力技术,1999,10:8-11
[14]张文兰,梁志明,李功龙.电厂锅炉风速在线监测系统设计.工业控制计算机,2002,2(3):43-45
[15]李从宁.贵阳发电厂9号炉二次风测量系统技术改造.贵阳电力技术,2002,2(3):23-24
[16]赵永刚.电厂锅炉一二次风风速在线监测系统的研制.华北电力技术,1999,10:8-11
[17]赵振宁,金安,陈锋.计算流体动力学在电厂中的应用.华北电力技术,2002,(2):26-28
[18]徐国权,黄志超.基于SolidWorks的参数化设计二次开发研究.机械设计与研究,2007,(2):60-61
[19]张俊,卢军,梁荣.SolidWorks参数化设计在注塑模中的应用研究.机械设计与制造.2005:39-42
[20]胡建生,.李卫民,刘玉浩.基于SolidWorks参数化实体造型的方法研究.辽宁工 学院学报,2007,27(2):105-110
[21]翟彤.基于SolidWorks二次开发的零件参数化设计.武汉工业学院学报,2007,26(1):49-52
[22]何岸杨.SolidWorks二次开发方法研究.计算机与信息技术,2007,28:69-70
[23]王福军.计算流体动力学分析.清华大学出版社,2004
[24]景思睿,张鸣远.流体力学.西安:西安交通大学出版社,2001
[25]李志旺,林志铭.锅炉二次风喷口流量的数学模型及测量方法探讨.黑龙江电力技术,1994:2(16)65-67
[26]李鑫禄.解决二次风门实际开度与远方指示不一致的办法.东北电力技术,2001,2:26-28
[27]胡珺,陈珊.1036t/h锅炉燃烧器二次风挡板的控制与运行.电力建设,2005,26(2):15-16
[28]陈宝明.W型锅炉二次供风系统挡板开度的计算.动力工程,2004,5(24):628-630
[29]Goettling Dieter R.Improving airflow measurements by a new inlet nozzle contour.Echnical and Symposium Papers Presented At the 2003 Winter Meeting of The ASHRAE,2003,(partl):462-472
[30]薛永飞.调节阀流量特性控制分析.河南纺织高等专科学校学报,2003,(2):19-23
[31]黄其圣,张勇,胡鹏浩,郭元.温度变化对机械零件配合精度的影响.机械设计,2001:45-47
[32]杨绪灿,金建三.弹性力学.北京:人民教育出版社,1987:215-219
[33]刘启林,柳敏煌,吴定智.公差配合与技术测量.华中科技大学出版社,2006:29-31
[34]机械工业部标准化研究所.形状和位置公差原理及应用.机械工业出版社,1983
[35]刘扬,刘静,扬国建.风道调节阀流量特性的实验研究.流体机械,1999,7(27):3-5
[36]Jangsawang Worn,Vallikul P.Effect of secondary air supply rate on the combustion of volatile gas in a controlled-air incinerator.International Journal of Energy Research,2006:549-556
[37]盛森芝,沈熊,舒玮.流速测量技术.北京:北京大学出版社,1987
[38]毛新业.矩形大管道的风量.测量自动化仪表,2000,(3):11-16
[39]焦健,肖敬红,刘心志,张后雷,李银培.锅炉二次风道流量特性分析与模化试验.热力发电,2005:39-42
[40]雷英,刘志永.循环流化床锅炉采用四角切圆送配二次风设计探讨.长沙电力学院学报,2002,17(1):55-58
[41]刘玉霞.基于SolidWorks软件的机械产品参数化设计.重庆职业技术学院学报,2006.15(2):149-150
[42]张晓桂,高波.基于SolidWorks二次开发的印刷机虚拟装配技术.包装工程,2007:86-88
[43]王占宽.电厂锅炉燃烧在线监测系统的应用及试验研究--丰镇发电厂6#炉试验和运行效果介绍.青海电力,2000,1:20-26
[44]范贤振.200 MW四角切向燃烧煤粉炉炉内过程的数值模拟.西安交通大学学报,2002,3(36):241-245
[45]由长福.采用不同湍流模型及差分格式对四角切向燃烧煤粉锅炉内冷态流场的数值模拟.动力工程,2001,1(21):1128-1131
[46]陶正良,蔡定硕,严春雷.电厂调节阀内流场的三维数值模拟及实验研究.工程热物理学报,2003,24(1):63-65
[47]赵帅,孙宝元,黄爱芹.基于FLUENT的喷嘴挡板机构的仿真实验.机床与液压,2006:189-191
[48]Cremer Marc A,Wang David H.CFD based evaluation of the sensitivity of furnace conditions to burner air and fuel imbalances.Combined Power Plant Air Pollutant Control Mega Symposium,2004(2):1001-1020
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