火电厂锅炉自整流二次风调节阀研究

【作者】 王聿彪；

【导师】 王益祥；

【作者基本信息】 南京理工大学 ， 机械电子工程， 2008， 硕士

【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。更多还原

【Abstract】 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.更多还原