Pro Engineer电厂锅炉空气调节阀门设计
时间:2017-01-17 19:50 来源:毕业论文 作者:毕业论文 点击:次
| 电站锅炉绝大多数是采用煤粉燃烧的方式发电，二次风的配风调节情况会影响锅炉内的燃烧过程，而燃烧过程的好坏直接关系到锅炉运行的经济性、可靠性。目前国内绝大多数火力发电厂队锅炉运行中二次风道内的配风情况缺乏合理的调节手段，使用的普通翻板阀流量特性为快开特性并且涡流强烈，阀后流场分布不均匀，影响了煤粉的充分燃烧，降低了锅炉的燃烧效率。 针对翻版阀的缺点，本论文决定通过采用改变喷口面积调节流量的方法来设计新型锅炉二次风调节阀，使该阀流量调节特性符合等百分比调节特性的特征，并且具有气流整流效果。首先对翻板阀和新型二次风调节阀的特点进行对比，得出新型二次风调节阀在结构上的合理性，然后进行方案设计和选择，最后通过使用Pro Engineer软件对新型二次风调节阀进行结构设计和受力分析。5388 关键词 二次风 调节阀 流量调节特性 结构设计 毕业设计说明书（论文）外文摘要 Title The design of the Power plant boiler air control valve Abstract Most of the boilers generate electricity by burning pulverized coal in the power stations. The adjustment of the auxiliary wind is an important key during boiler burning process. The stand or fall of combustion process decides the efficiency & reliability of boilers′ operation directly. But the auxiliary wind systems lack for supervisory system to control in the most of domestic power stations. 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. Aim at the shortcomings of flap valve, this thesis designed a new type of secondary air control valve by using the method of changing the nozzle area to adjust the flow , and make the flow regulation characteristics of the valve become percentage adjustment feature, and have the airflow rectification effect. First, comparing the characteristics of the flap valve and a new secondary air control valve to get the results that the new secondary air control valve is reasonable in the structure. Then Select the designed program. Finally do the structure design for the secondary air control valve using Pro/E and do some necessary analysis. Keywords Secondary Air Control Valve Flow Regulation Characteristics, Structure Design 目 次 1 引言 1 1.1 课题的背景 1 1.2 国内外研究现状 2 1.3 本论文的任务及论文结构 6 2 锅炉二次风调节阀设计 7 2.1 调节阀概述及设计依据 7 2.2 调节阀的结构设计 10 2.3 温度变化对运动机构的影响 18 2.4 二次风调节阀受力分析 22 2.5 调节阀阀门开度误差分析 31 2.6 本章小结 33 3 调节阀驱动装置的选择 34 3.1 调节阀驱动控制系统简述 34 3.2 步进电机驱动原理及型号选择 35 3.3 本章小结 36 4 pro/Engineer软件设计零部件过程 37 4.1 pro/ Engineer 软件简介 37 4.2 二次风调节阀零部件开发思路 37 4.3 本章小结 40 5 总结和展望 41 5.1 结论 41 5.2 展望 41 (责任编辑：qin) |