Investigation Of Aerodynamic Field In 600MW Unite Boiler Model By Particle Image Velocimetry Measurement

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.