【作者】 陈聆；

【导师】 陈刚；

【作者基本信息】 华中科技大学 ， 热能工程， 2005， 硕士

【摘要】 随着我国经济的高速发展,对电力的需求也日益增加,电力短缺成为短期内制约经济发展的瓶颈,大容量、高参数机组将会被更多的建设用以满足需要。四角切向燃烧锅炉是我国电站锅炉燃烧方式的主要类型,对该种燃烧方式锅炉的研究有着十分深远的意义。四角切向燃煤锅炉炉内实际切圆直径是切向燃烧的炉膛空气动力特性的一个重要参数,它对炉膛结渣、稳燃以及炉膛出口的烟速、烟温偏差有很重要的影响。影响实际切圆直径的的主要参数有:假想切圆直径; 燃烧器高宽比; 燃烧器喷口总面积与炉膛截面积之比; 燃烧器的间隙率; 一、二次风动量比; 燃烧器摆角。本文首先介绍了一种新的测量二维流场的工具:粒子图像激光测速系统PIV。这种测量方法具有以下优点:由于它以非接触方式测量流体的瞬时速度场,测量装置对流体的干扰几乎可以不计,因此测量结果精度高; 它可以将整个流场成像并将流场的全部速度矢量进行细致的描述,因此人们可以获得对整个流场的全面认识,这一特点是其它流体测量技术不可比拟的。为了更好的研究炉内空气动力场,作者以武汉锅炉厂600MW 机组锅炉设计方案为原型按1:20 比例搭建了试验平台。文章介绍了炉膛模型的详细尺寸,并对炉膛进入第二自模化区所需风量、风速进行了核算。在确定了本次试验的数据处理原则后,通过对试验获得的大量数据分析得出炉内空气动力场情况,并结合煤质特性分析了动力场对锅炉燃烧的影响情况。文章最后给出了对优化燃烧的几点建议:改变炉膛的假想切圆直径; 合理选择煤种; 控制一、二次风动量比; 适当降低火焰中心的位置。更多还原

【Abstract】 With the high-speed development of the economy of our country, the demand for the electricity increases day by day too, shortly, electric shortage becomes bottleneck restraining development of economy, large capacity, high parameter unit will be used to satisfy the demand by more construction. Tangential firing boiler is main type of burn way in our country power station boiler, research of this kind of burning way boiler has very far-reaching meaning. Actual diameter of tangential circle in Tangential firing boiler is an important parameter of aerodynamic field it have important influence on boiler slagging, stable combustion, flue gas temperature deviation and flue gas velocity deviation. The main parameter of influencing the actual diameter of tangential circle is as follows, diameter of tangential circle of the imagination; The proportion of the boiler’s high and wide; The proportion of the whole area of spout of the burning device and burner hearth section accumulate ; Interval rate of the burning device ; The proportion of the one, the second-class in two ail for quantity; The angle is put in burning device . At first, This thesis recommends one new measurement two-dimentional to shed the tool of field: Particle image velocimetry. It have a good number of advantages: because Particle image velocimetry measures the instantaneous velocity field of the fluid by way of exposed to object, it can nearly disregard to measure the interference to the fluid of the device , so it is high to measure the precision of fruiting; It can flow being whole the formation of image of field and all tempo vectors of field will flow to carry on careful description , so people can get to flow to know in an all-round way field entirely, characteristic this whether other fluid measure that technology can’t be compared. For better research in the aerodynamic field, the author put up the experimental platform according to the proportion of 1:20 for the 600MW unit boiler of Wuhan factory. Article introduce burner hearth detailed size of model, check and calculate wind amount and wind speed that the boiler need to enter second mould area. After confirming the data processing principle of this test, drawing the aerodynamic field in the boiler through a large number of data analysis that the test obtains, combine nature of coal characteristic analyse aerodynamic field to influence situation that boiler burn. Finally, the article is provided some suggestions to optimizing burning: Change the diameter of tangential circle of imagination ; Choose the coal rationally; It control one, two second-class air quantity proportion; Reduce the position of centre of the flame properly.更多还原