CN113464933A

CN113464933A - Swirler with gradually changed spiral angle

Info

Publication number: CN113464933A
Application number: CN202110747966.1A
Authority: CN
Inventors: 杜佳佳; 刘银杰; 李松; 徐松柏; 唐宪国
Original assignee: Hefei Cement Research and Design Institute Co Ltd
Current assignee: Hefei Cement Research and Design Institute Co Ltd
Priority date: 2021-07-02
Filing date: 2021-07-02
Publication date: 2021-10-01

Abstract

The invention relates to the technical field of kiln head multichannel burners of rotary kilns, and discloses a swirler with gradually changed spiral angles, which comprises a swirler body of the swirler, wherein a plurality of same blades are uniformly distributed on the circumference of the excircle of the swirler body, four threaded holes for dismounting the swirler are formed in the front end surface of the swirler body, front internal threads with certain length are formed in the front end of the swirler body and are connected with a central air plate, and rear internal threads with certain length are formed in the tail part of the swirler body and are connected with a tail pipeline. The spiral angle of the cyclone is gradually changed along the axial direction, and the cyclone angle at the outlet can be adjusted by axially adjusting the cyclone. The online rotational flow angle adjusting method is provided for the combustor, the rotational flow angle can be adjusted online according to the change of coal quality in a factory, the adaptability of the combustor is stronger, and the using effect of the combustor and the quality of production and clinker cannot be influenced due to the change of the coal quality.

Description

Swirler with gradually changed spiral angle

Technical Field

The invention relates to the technical field of multi-channel burners at the kiln head of a rotary kiln, in particular to a swirler with a gradually changed spiral angle.

Background

The multi-channel burner at the kiln head of the rotary kiln is one of key devices for cement production, and the quality of the use performance of the multi-channel burner directly influences the quality of cement clinker, the generation amount of nitrogen oxides in the kiln, the coal consumption and the overall economic benefit of a production line. The working principle of the kiln head burner is as follows: the high-speed axial flow air, the rotational flow air and the low-speed coal air form a high-speed difference jet flow, a certain speed field and a certain pressure field can be formed around the head of the burner, and the high-temperature secondary air from the grate cooler is sucked in an entrainment manner, so that the pulverized coal premixed with the coal feeding air is mixed with the combustion-supporting air and the secondary air more uniformly and completely through the disturbance of the flow field. The coal quality used in the production of different manufacturers is different, the coal quality used in different time periods of the same manufacturer is different, and sometimes the coal quality is greatly changed. The pulverized coal combustion effects of different qualities are different greatly, under the condition of better coal quality, the pulverized coal combustion speed is high, the spiral angle of the cyclone can be smaller, and under the condition of poorer coal quality, the spiral angle of the cyclone needs to be larger, so that the retention time of pulverized coal in a burning zone is increased, and the pulverized coal is fully combusted.

The spiral angle of the existing cyclone is not changed, and the cyclone can only adapt to coal powder in a certain quality interval. When the coal quality changes greatly, the cyclone with different rotational flow angles can be replaced offline to adapt to the combustion of the pulverized coal, but the kiln needs to be stopped, and the operation is more complex.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a swirler with a gradually changed spiral angle.

The invention provides the following technical scheme: the utility model provides a swirler of spiral angle gradual change, includes swirler body, a plurality of the same blades are being evenly distributed to swirler body excircle circumference, the terminal surface sets up four screw holes that are used for swirler to dismantle before the swirler body, swirler body front end inside has the preceding internal thread of certain length to be connected with central aerofoil, swirler body afterbody sets up the back internal thread of certain length to be connected with afterbody pipe connection.

Preferably, the helical angle of the blade is gradually changed along the axial direction, and the width of the blade is not changed.

Compared with the prior art, the invention has the following beneficial effects:

the cyclone with gradually changed spiral angle is arranged at the cyclone air outlet end of the burner, and the cyclone air outlet cyclone angle is adjusted through adjusting the axial movement of the cyclone, so that the cyclone air outlet cyclone strength can be adjusted, the cyclone is adaptive to the change of coal quality, an online adjusting mode of the cyclone angle is provided for the burner, the cyclone angle can be adjusted online according to the change of the coal quality in a factory, and the adaptability of the burner is stronger.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the front side of the swirler body of the present invention;

FIG. 3 is a schematic view of the rear side of the swirler body of the present invention.

In the figure: 1. a swirler body; 2. a central air plate; 3. a tail duct; 4. bolt holes; 5. a blade; 6. front internal threads; 7. and a rear internal thread.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure, and in order to keep the following description of the embodiments of the present disclosure clear and concise, detailed descriptions of known functions and known parts of the disclosure are omitted to avoid unnecessarily obscuring the concepts of the present disclosure.

Referring to fig. 1-3, a swirler with gradually-changed spiral angle comprises a swirler body 1, wherein a plurality of same blades 5 are uniformly distributed on the outer circumference of the swirler body 1, the spiral angle of the blades 5 is gradually changed along the axial direction, the width of the blades 5 is unchanged, four threaded holes 4 for dismounting the swirler are formed in the front end face of the swirler body 1, front internal threads 6 with a certain length are formed in the front end of the swirler body 1 and are connected with a central air plate 2, rear internal threads 7 with a certain length are formed in the tail of the swirler body 1 and are connected with a tail pipeline 3, and the swirl angle of a swirl air outlet at the end face of the outlet can be adjusted by axially adjusting the swirler body 1, so that the swirl strength of the swirl air outlet is adjusted. The rotational flow angle can be realized by adjusting the axial position of the cyclone on line according to the change of the coal quality, the operation method is simple, and the complicated process of replacing the cyclone off line is avoided.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.

Claims

1. The utility model provides a swirler of spiral angle gradual change which characterized in that: including swirler body (1), swirler body (1) excircle circumference evenly distributed a plurality of same blades (5), swirler body (1) preceding terminal surface sets up four screw holes (4) that are used for the swirler to dismantle, swirler body (1) front end inside has preceding internal thread (6) of certain length to be connected with central aerofoil (2), swirler body (1) afterbody sets up back internal thread (7) of certain length to be connected with afterbody pipeline (3).

2. A swirl gradually tapering swirler as claimed in claim 1, wherein: the spiral angle of the blade (5) is gradually changed along the axial direction, and the width of the blade (5) is not changed.