BG64568B1 - Vortex generator for centrifugal powder concentrator - Google Patents

Abstract

The Vortex generator finds application in the power industry. It consists of a dissector (1), fixed to supporting elements (2) to a casing (3) and axles (4) of blades (5) fixed to them, simultaneously driven by a common mechanism (6). The supporting elements (2) are in the form of fixed blades to which the front angle (7) ranges from 0 to 15 degrees, and the rear angle (8) is smaller or equal to 0 degrees. Blades (5) are mounted on one side to axles (4) so that they will be like an extension to the supporting elements (2). On another embodiment blades (5) have an alternating angle of attack, angle (9) in proximity to the dissector (1) is bigger than angle (10), in proximity to the wall of casing (3).

Description

(54) Vortex for a centrifugal cooler

Technical field

The invention relates to a vortex for a centrifugal powder concentrator of coal dust and is used in energy.

BACKGROUND OF THE INVENTION

In the art, a vortex is known for a centrifugal powder concentrator, consisting of a cutter, fixedly fixed by means of supporting elements to the housing and axes with blades fixed to them simultaneously, driven simultaneously by a common mechanism.

This vortex has a high aerodynamic drag coefficient and low dust separation efficiency, especially in the range of finer fractions.

SUMMARY OF THE INVENTION

It is an object of the invention to provide a vortex for a centrifugal powder concentrator that has a lower aerodynamic drag coefficient and is effective in separating the powder over a wider range of the fractional composition.

The problem is solved by a vortex for a centrifugal powder concentrator, consisting of a splitter, fixed by means of supporting elements to the housing and axes with blades fixed to them, driven simultaneously by a common mechanism.

According to the invention, the supporting elements are fixed blades with an anterior angle of from 0 to 15 ° and a posterior angle of <0 °. In this case, the blades are unilaterally mounted on the axles so that they are in continuation of the supporting elements.

In an embodiment of the invention, the blades attached to the axles have a variable angle of attack, the angle near the splitter being greater than the angle near the wall of the housing.

The main advantage of the invention is that the concentrator has a lower aerodynamic drag coefficient and is effective in separating the powder over a wider range of the fractional composition.

Explanation of the annexed figures

An exemplary embodiment of the invention is shown in the accompanying drawings, of which:

Figure 1 is a longitudinal section of the vortex;

Figure 2 is a cross-sectional view of the vortex.

An exemplary embodiment of the invention

The swirl for a centrifugal powder concentrator consists of a splitter 1 fixedly fixed by means of supporting elements 2 to the housing 3 and axes 4 with fixed blades 5 mounted simultaneously by a common mechanism 6. The supporting elements 2 are fixed blades at which the front angle 7 is from 0 to 15 ° and the rear angle 8 is less than or equal to 0 °. The blades 5 are unilaterally mounted to the axles 4 so as to be extensions of the supporting members 2.

In another embodiment, the blades 5 have a variable angle of attack, with the angle 9, adjacent to the cutter 1, being larger than the angle 10, near the wall of the housing 3.

Application of the invention

As the dust-gas stream passes through the housing 3 from the bottom up, it meets the cutter 1, the supporting elements 2, the inclined blades 5 and swirls. Due to the centrifugal forces, the particles of the dust-gas stream are sealed against the wall of the housing 3, and mainly cleaner gases remain in the central core. From the size of the slope of the blades 5, respectively. the degree of separation of the dust depends on the average tangential flow velocity obtained.

The conversion of the supporting elements 2 into fixed blades with a forward angle of 0 to 15 ° and a rear angle of less than or equal to 0 ° ensures low aerodynamic drag in all operating modes.

Mounting the blades 5 one-sidedly to the axles 4 so that they are in continuation 5 of the supporting elements 2 also reduces aerodynamic drag.

The lower aerodynamic drag enables the vortex to operate at greater angles of attack on the blades 5 and respectively. greater efficiency in the range of fine fractions.

The higher blade angle of attack 5 near the cutter 1 increases the average tangential flow velocity, which is a major factor in increasing the degree of dust separation.

The smaller angle of attack of the blades 5 near the wall of the housing 3 contributes to fewer deflections of the particles from the wall and their return to the center, which helps to increase the degree of dust separation.

Claims (2)

Claims 1. A vortex for a centrifugal powder concentrator consisting of a divider fixed fixed by means of supporting elements to a housing and axes with fixed blades mounted thereon, driven simultaneously by a common mechanism, characterized in that, under the holding elements (2), they are stationary blades, at which the front angle (7) is 0 to 15 ° and the rear angle (8) is less than or equal to 0 °, with the blades (5) being unilaterally mounted to the axles (4) so that they are as extension of the supporting elements (2). Centrifugal powder concentrator vortex according to claim 1, characterized in that the blades (5) have a variable angle of attack, with the angle (9) near the cutter (1) being larger than the angle (10), close to the housing wall (3).