Guide apparatus of medium speed coal mill vane throat ring

Abstract

The invention discloses a guide apparatus of a medium speed coal mill vane throat ring. The guide apparatus comprises a guide plate, the guide plate is arranged at the lower portion of the medium speed coal mill vane throat ring, the upper end of the guide plate is fixed to the edge of the throat ring close to a vane outlet area, and the lower end of the guide plate is fixed to the edge of a vane inlet close to a primary air chamber. The upper end of the guide plate has a same arc degree with the flow position wall surface of the throat ring, the lower end of the guide plate has a same arc degree with the inlet wall surface of the vane, two sides of the guide plate are inclined planes, an inclined angle between each of the inclined planes and a horizontal plane is same to the inclined angles of eddy flow blades, and the thickness of the guide plate is not lower than 5mm. The quantity of the guide plate is same to the quantity of the eddy flow blades in the vane. The guide apparatus can reduce local resistance of the throat ring, reduces the mill bowl differential pressure by about 500Pa, and also reduces the air leakage rate of the dynamic and static clearance of the vane in order to increase the air speed of the outlet of the vane, reduce the pebble coal discharge rate and improve the milling output of the coal mill.

Description

technical field [0001] The invention belongs to the field of mechanical components, and relates to a flow guiding device for a flow ring of an air ring of a medium-speed coal mill. Background technique [0002] Generally, in order to adjust and adapt to the needs of changes in coal types, the wind ring of medium-speed coal mills is designed with a larger flow area, and then the actual outlet area is adjusted through the throttling ring. The actual flow area after installing the throttling ring is determined by various factors such as the discharge rate of pebble coal, flow resistance, pulverizing output, etc. Generally, a smaller discharge rate of pebble coal, a smaller flow resistance, and a greater Powder output, etc. In fact, these three main factors will affect each other. For example, the smaller the emission rate of pebble coal is controlled, the smaller the flow area is required to increase the wind speed at the outlet of the wind ring, which will increase the flow re...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of reducing the flow resistance of the air ring and reducing the discharge rate of pebble coal involved in the background technology, the present invention provides a flow guide device for the air ring flow ring of the medium-speed coal mill, which can be used without affecting the existing throttling of the coal mill. Under the premise of the ring structure, reduce the local resistance of the wind ring, increase the wind speed at the outlet of the wind ring, and reduce the emission rate of pebble coal

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