CN218936341U - Six-channel kiln tail burner - Google Patents

Abstract

The utility model provides a six-channel kiln tail burner which comprises a nozzle and a rear pipeline connected with the nozzle, wherein the rear pipeline comprises a central pipeline, a first air pipeline, a second air pipeline, an inner gas pipeline, an outer gas pipeline and a third air pipeline from inside to outside; the nozzle is sequentially and concentrically provided with a central shaft, a cyclone, a gas inner pipe, a gas outer pipe, an outer shaft and an outer pipe from inside to outside; the central shaft is connected with the central pipeline; the cyclone is connected with the first air pipeline; the gas inner pipe is connected with the second air pipeline; the gas outer pipe is connected with the internal combustion gas pipeline; the outer shaft is connected with the outer gas pipeline, and the outer pipe is connected with the third air pipeline. The burner of the utility model has the advantages of simple structure, lower cost and full combustion.

Description

Six-channel kiln tail burner

Technical Field

The utility model belongs to the field of rotary kiln burners, and particularly relates to a six-channel kiln tail burner.

Background

In the existing rotary kiln burner, no matter the pure coal powder burner, the gas burner and the coal powder and gas mixed burner, the spiral flow guide structure is never arranged in the coal powder channel and the gas channel. After the pulverized coal and the fuel gas are blown out, the blown pulverized coal and the blown fuel gas are diffused only by the compressed air in the cyclone air duct and the like, so that the combustion is convenient. And the pulverized coal and the fuel gas are combusted by the fuel injection channel to be ignited from the inside through the fuel injection port. For a pure gas burner, the gas can be ignited by means of an electric igniter, and a special oil gun is not required to be arranged.

Disclosure of Invention

The utility model provides a six-channel kiln tail burner.

The object of the utility model is achieved in the following way: the six-channel kiln tail burner comprises a nozzle and a rear pipeline connected with the nozzle, wherein the rear pipeline comprises a central pipeline, a first air pipeline, a second air pipeline, an inner gas pipeline, an outer gas pipeline and a third air pipeline from inside to outside; the nozzle is sequentially and concentrically provided with a central shaft, a cyclone, a gas inner pipe, a gas outer pipe, an outer shaft and an outer pipe from inside to outside; an ignition channel is arranged in the central shaft, an internal flow air channel is arranged in front of the central shaft and the cyclone, an external flow air channel is arranged between the cyclone and the gas inner pipe, a first gas channel is arranged between the gas inner pipe and the gas outer pipe, and a second gas channel is arranged between the gas outer pipe and the outer shaft; an axial flow air channel is arranged between the outer shaft and the outer tube; the central shaft is connected with the central pipeline; the cyclone is connected with the first air pipeline; the gas inner pipe is connected with the second air pipeline; the gas outer pipe is connected with the internal combustion gas pipeline; the outer shaft is connected with the outer gas pipeline, and the outer pipe is connected with the third air pipeline.

The rear pipeline further comprises a main air supply pipeline communicated with a compressed air source, and the main air supply pipeline is provided with a first air supply pipeline, a second air supply pipeline and a third air supply pipeline which are respectively communicated with the first air pipeline, the second air pipeline and the third air pipeline; the inner gas pipeline is provided with a first gas inlet, and the outer gas pipeline is provided with a second gas inlet.

Any rear end of the third air pipeline and any rear end of the external fuel gas pipeline are provided with expansion joints; the rear ends of the first air pipeline and the second air pipeline are respectively provided with an expansion joint.

Any one or both of the first gas channel and the second gas channel are provided with a plurality of spiral blades along the circumference to form a rotational flow gas channel; the rotational flow gas channel, the inner rotational flow air channel and the outer rotational flow air channel have the same rotational direction.

The beneficial effects of the utility model are as follows: the spiral blades are arranged to divide the first gas channel into a plurality of spiral swirl gas channels, and the gas can be more uniformly diffused after flowing out of the spiral swirl gas channels at a certain rotating speed, so that the subsequent ignition is facilitated. The six-channel gas burner nozzle and the corresponding burner can be applied to the occasion of the rotary kiln which only passes through coke oven gas and converter gas, and the six-channel gas burner nozzle has the advantages of simple structure, lower cost and full combustion.

Drawings

FIG. 1 is an overall schematic of a combustor.

Fig. 2 is a perspective view of a nozzle.

Fig. 3 is a partial cross-sectional view of a nozzle.

Fig. 4 is a schematic perspective view of a central shaft.

Fig. 5 is a perspective view of a cyclone.

Fig. 6 is a perspective view of a gas inner tube.

Fig. 7 is a perspective view of the gas outer tube.

Fig. 8 is a schematic view of a hidden outer tube of a nozzle.

Fig. 9 is an enlarged view of the burner tail section.

Wherein 2 is a nozzle, 20 is a central shaft, 21 is a cyclone, 22 is a gas inner tube, 23 is a gas outer tube, 24 is an outer shaft, and 25 is an outer tube; 200 is a tapered outer surface, 201 is a helical protrusion, 210 is a helical groove, 220 is a helical blade; the outer shaft duct 240, the air outlet duct 241, the ignition duct 30, the inner rotary duct 31, the outer rotary duct 32, the first gas duct 33, the second gas duct 34, the axial duct 35, the rear duct 4, the central duct 40, the first air duct 41, the second air duct 42, the inner gas duct 43, the outer gas duct 44, the third air duct 45; 46 is a first gas supply duct, 47 is a second gas supply duct, 48 is a third gas supply duct, 49 is a first gas inlet, and 50 is a second gas inlet.

Detailed Description

The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments, it being understood that the preferred embodiments described herein are for illustrating and explaining the present utility model only and should not be construed as limiting the scope of the present utility model, and that some insubstantial modifications and adaptations can be made by those skilled in the art in light of the above description of the present utility model. In the present utility model, unless explicitly specified and defined otherwise, technical terms used in the present application should be construed in a general sense as understood by those skilled in the art to which the present utility model pertains. The terms "connected," "fixedly," "disposed" and the like are to be construed broadly and may be fixedly connected, detachably connected or integrally formed; can be directly connected or indirectly connected through an intermediate medium; either mechanically or electrically. Unless explicitly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact through an intervening medium. Moreover, a first feature being "above" or "over" or "upper" a second feature may be a first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under" or "beneath" or "under" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is level less than the second feature. Relational terms such as first, second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

As shown in fig. 1 to 9, the gas passage of the burner nozzle of the rotary kiln comprises a gas inner pipe 22 and a gas outer pipe 23 which are concentrically arranged, and the gas outer pipe 23 is arranged outside the gas inner pipe 22; a first gas channel 33 is formed between the outer wall of the gas inner pipe 22 and the inner wall of the gas outer pipe 23; the outer wall of the gas inner pipe 22 or the inner wall of the gas outer pipe 23 is provided with a plurality of spiral blades 220 along the circumference; the helical blades 220 divide the first gas passage 33 into a number of helical swirl gas passages. In the existing rotary kiln burner, no matter the pure coal powder burner, the gas burner and the coal powder and gas mixed burner, the coal powder channel and the gas channel are never provided with spiral blades, and no rotational flow structure is arranged. Only the compressed air in the cyclone air duct and the like is used for diffusing the pulverized coal and the fuel gas. In the present utility model, the first gas channel 33 is divided into a plurality of spiral swirl gas channels by the spiral blades 220, and the gas flows out of the spiral swirl gas channels and has a certain rotation speed, so that the gas can be more uniformly diffused, which is beneficial to subsequent ignition.

Further, the helical angle of the helical blade 220 is between 15 and 25 degrees. Preferably 20 degrees. Six helical blades 220 are circumferentially uniformly distributed in the first gas passage 33. The rotation direction of the helical blades 220 is the same as the rotation direction of the rotary kiln.

The burner nozzle of the gas passage of the burner nozzle of the rotary kiln described above comprises the first gas passage 33 having the helical blades 220.

In addition, an outer shaft 24 is concentrically arranged outside the gas outer tube 23, and a second gas passage 34 is formed between the inner wall of the outer shaft 24 and the outer wall of the gas outer tube 23; the second gas channel 34 is also circumferentially provided with the spiral vane 220, so that the second gas channel 34 is also divided into a plurality of spiral swirl gas channels; the rotational flow direction of the first gas passage 33 and the second gas passage 34 is the same as the rotational direction of the rotary kiln. Of course, the spiral vane 220 may not be provided in the second gas passage 34, and the existing structure may be maintained.

Further, the nozzle 2 includes a central shaft 20, an ignition channel 30 is disposed in the central shaft 20, an electric ignition mechanism is disposed in the ignition channel 30, and the specific structure of the electric ignition mechanism is not shown in the drawing; the nozzle 2 is not provided with a coal dust passage. The pulverized coal in the pulverized coal channel is difficult to ignite, and a high-pressure oil gun is arranged in an ignition channel of a combustor with the pulverized coal channel. For a pure gas channel without pulverized coal, the gas is easier to burn, so an electric ignition mechanism can be adopted for ignition. The rear end of the electric sparking mechanism is connected with a controller, and the sparking is controlled by the controller. The electric ignition mechanism is available in the prior art and purchased. And will not be described in detail. The burner nozzle adopting the electric ignition mechanism is more suitable for arranging the helical blades 220 in the fuel gas channel, so that the fuel gas discharged from the fuel gas channel is self-diffused and the combustion is accelerated.

As shown in fig. 1-9, the six-channel gas burner nozzle 2 is provided with a central shaft 20, a cyclone 21, a gas inner pipe 22, a gas outer pipe 23, an outer shaft 24 and an outer pipe 25 concentrically from inside to outside in sequence; an ignition channel 30 is arranged in the central shaft 20, an inner rotary air duct 31 is arranged in front of the central shaft 20 and the cyclone 21, an outer rotary air duct 32 is arranged between the cyclone 21 and the gas inner pipe 22, a first gas channel 33 is arranged between the gas inner pipe 22 and the gas outer pipe 23, and a second gas channel 34 is arranged between the gas outer pipe 23 and the outer shaft 24; between the outer shaft 24 and the outer tube 25 is an axial flow duct 35.

Wherein, any one or both of the first gas channel 33 and the second gas channel 34 are provided with a plurality of spiral blades 220 along the circumference to form a swirl gas channel; the rotational flow gas channel, the inner rotational flow air channel and the outer rotational flow air channel have the same rotational direction. The rotation direction of the rotary kiln is kept consistent with that of the rotary kiln, so that the uniform mixing of fuel gas and materials is ensured. The angle of the helical blades 220 and other technical features are described in detail in the gas passage of the burner nozzle of the rotary kiln above and are not repeated.

In a specific embodiment, the first gas channel 33 is a channel for passing converter gas; the second gas channel 34 is a channel for passing coke oven gas; the outer wall of the gas inner pipe 22 or the inner wall of the gas outer pipe 23 is provided with a plurality of spiral blades 220 along the circumference; the helical blades 220 divide the first gas passage 33 into a number of helical swirl gas passages. The helical blade 220 is not disposed within the second gas passage 34. The second gas channel 34 is internally provided with a supporting plate, which plays a supporting role and has no swirling effect. Since coke oven gas is easier to burn than converter gas and the second gas passage 34 is wider, the spiral blade 220 may not be provided and the materials may be easier to burn after mixing. The angle of the helical blade 220 is between 15 and 25 degrees. The ignition channel 30 is not provided with an oil gun, and is provided with an electric ignition mechanism. Of course, the oil gun ignition mechanism can also realize the ignition effect.

The front end of the central shaft 20 is provided with a tapered outer surface 200, and the diameter of one side of the tapered outer surface 200, which is close to the front end surface of the central shaft 20, is the largest; a plurality of spiral bulges 201 are circumferentially arranged on the cylindrical surface of the front end of the central shaft 20, which is close to the conical outer surface 200; the inner surface of the cyclone 21 is cylindrical, and the inner surface of the cyclone 21, the outer surface of the central shaft 20 provided with the spiral protrusion 201, and the conical outer surface 200 cooperate to form the internal flow air channel. Compressed air is first formed into swirl wind through the passage between the spiral protrusions 201 and then ejected from the gap between the tapered outer surface 200 and the inner surface of the cyclone 21. The central shaft 20 or the cyclone 21 is adjusted back and forth, and the gap between the tapered outer surface 200 and the inner surface of the cyclone 21 is changed, so that the air volume and the air speed are adjusted. The angle of the helical protrusion 201 is between 35 and 45 degrees.

The outer surface of the cyclone 21 is circumferentially provided with a plurality of spiral grooves 210; the inner surface of the gas inner pipe 22 and the outer surface of the cyclone 21 provided with the spiral groove 210 form the outer cyclone air channel 32; as the spiral groove 210 extends toward the nozzle 2, the cross-sectional area of the spiral groove 210 gradually decreases. The relative positions of the cyclone 21 and the gas inner pipe 22 are adjusted back and forth, so that the wind speed and the flow rate of the outlet of the outer cyclone air duct 32 can be adjusted. The front end of the outer shaft 24 is an outer shaft wind head 240 with a conical outer surface, the diameter of the front end of the outer shaft wind head 240 is large, the diameter of the rear end of the outer shaft wind head 240 is small, an air outlet groove 241 is arranged on the outer shaft wind head 240 along the circumference, the air outlet groove 241 is a part of a cylindrical hole, and the axis of the air outlet groove 241 is parallel to the axis of the outer shaft 24; the inner surface of the outer tube 25 is cylindrical, and is matched with the outer surface of the outer shaft 24 to form an axial flow air duct 35. Moving either the outer shaft 24 or the outer tube 25 back and forth can change the flow rate and flow volume of the axial flow duct 35. The structure of the outer shaft 24 is known in the art and is described in detail in the burner nozzle axial flow duct structure of the patent CN 209726202U. And will not be described in detail.

As shown in fig. 1-9, a six-channel kiln tail burner includes the nozzle 2 described hereinabove and a rear duct 4 connected to the nozzle 2. The rear duct 4 comprises, from inside to outside, a central duct 40, a first air duct 41, a second air duct 42, an internal combustion air duct 43, an external combustion air duct 44, a third air duct 45. The nozzle 2 is provided with a central shaft 20, a cyclone 21, a gas inner pipe 22, a gas outer pipe 23, an outer shaft 24 and an outer pipe 25 from inside to outside concentrically in sequence; an ignition channel 30 is arranged in the central shaft 20, an inner rotary air duct 31 is arranged in front of the central shaft 20 and the cyclone 21, an outer rotary air duct 32 is arranged between the cyclone 21 and the gas inner pipe 22, a first gas channel 33 is arranged between the gas inner pipe 22 and the gas outer pipe 23, and a second gas channel 34 is arranged between the gas outer pipe 23 and the outer shaft 24; between the outer shaft 24 and the outer tube 25 is an axial flow duct 35. The central shaft 20 of the nozzle 2 is connected to the central duct 40; said cyclone 21 is connected to said first air duct 41; the gas inner tube 22 is connected to the second air duct 42; the gas outer tube 23 is connected to the gas pipe 43; the outer shaft 24 is connected to the outer gas duct 44, and the outer tube 25 is connected to the third air duct 45.

The rear pipeline 4 further comprises a total air supply pipeline communicated with a compressed air source, and a first air supply pipeline 46, a second air supply pipeline 47 and a third air supply pipeline 48 which are respectively communicated with the first air pipeline 41, the second air pipeline 42 and the third air pipeline 45 are arranged on the total air supply pipeline; the inner gas pipe 43 is provided with a first gas inlet 49, and the outer gas pipe 44 is provided with a second gas inlet 50. Wherein valves or flow meters are respectively arranged on the first air supply pipeline 46, the second air supply pipeline 47 and the third air supply pipeline 48 to control the flow rate of the entering compressed air.

Any rear ends of the third air pipeline 45 and the outer gas pipeline 44 are provided with expansion joints; the rear ends of the first air duct 41 and the second air duct 42 are respectively provided with expansion joints. The corresponding pipeline can be adjusted back and forth by pulling the telescopic joint, so that the wind direction and the wind speed of the nozzle are adjusted. The rest of the structure of the nozzle 2 may be the structure described above and will not be described in detail.

In the specific implementation, compressed air is respectively fed into the first air feeding pipeline 46, the second air feeding pipeline 47 and the third air feeding pipeline 48; gas is introduced into the first gas inlet 49 and the second gas inlet 50. The electric ignition mechanism is controlled to ignite by the controller, so that the combustion of the burner is realized.

It should be noted that terms such as "center", "transverse", "longitudinal", "length", "width", "thickness", "height", "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "clockwise", "counterclockwise", etc. used in the description are orientation or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplification of description, rather than for indicating or suggesting that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation. And therefore should not be construed as limiting the scope of the utility model.

The above-described preferred embodiments of the present utility model are only preferred embodiments, but not all embodiments, and the scope of the present utility model is not limited thereto. The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description. When the combination of the technical solutions is contradictory or impossible to realize, it should be considered that the combination of the technical solutions does not exist and is not within the scope of protection claimed by the present utility model. It should be noted that equivalents and modifications according to the technical solution of the present utility model and the inventive concept thereof, as well as several changes and modifications made thereto, will be apparent to those skilled in the art without departing from the spirit of the general inventive concept and the principles of the present utility model, which should also be considered as the scope of the present utility model.

Claims (4)

1. The utility model provides a six passageway kiln tail combustors, includes nozzle and the rear portion pipeline that is connected with the nozzle, its characterized in that: the rear pipeline comprises a central pipeline, a first air pipeline, a second air pipeline, an inner gas pipeline, an outer gas pipeline and a third air pipeline from inside to outside; the nozzle is sequentially and concentrically provided with a central shaft, a cyclone, a gas inner pipe, a gas outer pipe, an outer shaft and an outer pipe from inside to outside; an ignition channel is arranged in the central shaft, an internal flow air channel is arranged in front of the central shaft and the cyclone, an external flow air channel is arranged between the cyclone and the gas inner pipe, a first gas channel is arranged between the gas inner pipe and the gas outer pipe, and a second gas channel is arranged between the gas outer pipe and the outer shaft; an axial flow air channel is arranged between the outer shaft and the outer tube; the central shaft is connected with the central pipeline; the cyclone is connected with the first air pipeline; the gas inner pipe is connected with the second air pipeline; the gas outer pipe is connected with the internal combustion gas pipeline; the outer shaft is connected with the outer gas pipeline, and the outer pipe is connected with the third air pipeline.

2. A six-channel kiln tail burner as claimed in claim 1, wherein: the rear pipeline further comprises a main air supply pipeline communicated with a compressed air source, and the main air supply pipeline is provided with a first air supply pipeline, a second air supply pipeline and a third air supply pipeline which are respectively communicated with the first air pipeline, the second air pipeline and the third air pipeline; the inner gas pipeline is provided with a first gas inlet, and the outer gas pipeline is provided with a second gas inlet.

3. A six-channel kiln tail burner as claimed in claim 2, wherein: any rear end of the third air pipeline and any rear end of the external fuel gas pipeline are provided with expansion joints; the rear ends of the first air pipeline and the second air pipeline are respectively provided with an expansion joint.

4. A six-channel kiln tail burner as claimed in claim 1, wherein: any one or both of the first gas channel and the second gas channel are provided with a plurality of spiral blades along the circumference to form a rotational flow gas channel; the rotational flow gas channel, the inner rotational flow air channel and the outer rotational flow air channel have the same rotational direction.

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