CN215637131U

CN215637131U - Lime rotary kiln low-nitrogen burner

Info

Publication number: CN215637131U
Application number: CN202121073149.4U
Authority: CN
Inventors: 吴敬
Original assignee: Xiangyang Zhonghe M&e Technology Co ltd
Current assignee: Xiangyang Zhonghe M&e Technology Co ltd
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2022-01-25
Anticipated expiration: 2031-05-18

Abstract

The utility model discloses a lime rotary kiln low-nitrogen burner which is characterized by relating to the technical field of burners and comprising a flame holding cylinder, wherein the flame holding cylinder comprises a body part and a necking part arranged at one end of the body part, and the necking part and the body part are coaxially arranged; one end of the body part, which is far away from the necking part, is provided with a first connecting part; through holding together the flame cover design for holding together the flame cover that possess the throat structure with traditional straight tube-shape structure, utilize the gradual change structure that throat and this somatic part formed for further homogeneous mixing behind the throat of gas and the buggy of burning makes the flame that finally forms more stable, promotes stable, reliable of burning.

Description

Lime rotary kiln low-nitrogen burner

Technical Field

The utility model relates to the technical field of burners, in particular to a low-nitrogen burner of a lime rotary kiln.

Background

At present, the combustor for the lime rotary kiln has a plurality of fuel varieties, such as coal powder, natural gas, coke oven gas, blast furnace gas and the like.

The company successfully designs a burner nozzle (see application number: 201720638511.5; patent name: nozzle of gas co-combustion burner for rotary kiln) aiming at the mixed combustion, and aims to reduce the environmental pollution of the rotary kiln and improve the reliability and economy of fuel.

However, in actual mass production, because of the influence of cost restriction, the coal powder is still adopted as the fuel in the current common mode; therefore, in order to further improve the combustion efficiency and ensure the stability and reliability of combustion, design engineers need to continuously improve the structure of the combustor.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the structure of the combustor is further improved and designed, so that the coal powder and the gas are uniformly mixed, and the purposes of promoting combustion and improving the stability and the reliability of flame are achieved.

The specific scheme provided by the utility model is as follows:

a lime rotary kiln low-nitrogen burner comprises a flame gathering cover with a flame gathering barrel, wherein the flame gathering barrel comprises a body part and a necking part arranged at one end of the body part, and the necking part and the body part are coaxially arranged; one end of the body part, which is far away from the necking part, is provided with a first connecting part.

Further, the body part is smoothly connected with the necking part to form a flame holding channel with a gradual change structure.

Further, the body part and the necking part are of an integrally formed structure.

Further, the flame gathering cover also comprises a protective cylinder, and the protective cylinder is sleeved on the flame gathering cylinder and is coaxially arranged with the flame gathering cylinder; the inner diameter of the protective cylinder is larger than the outer diameter of the flame holding cylinder so as to form a heat insulation space.

Further, the protective cylinder at least covers the body part of the flame holding cylinder.

Furthermore, a plurality of heat dissipation holes are formed in the protection cylinder.

The beneficial effect that adopts this technical scheme to reach does:

through holding together the flame cover design for holding together the flame cover that possess the throat structure with traditional straight tube-shape structure, utilize the gradual change structure that throat and this somatic part formed for further homogeneous mixing behind the throat of gas and the buggy of burning makes the flame that finally forms more stable, promotes stable, reliable of burning.

Furthermore, the burner also comprises a combustion nozzle with a nozzle, and the flame holding cover is arranged at the front end of the nozzle.

Furthermore, the front end of the nozzle is provided with a second connecting part, and the second connecting part and the first connecting part are matched with each other to enable the flame holding cover to be detachably and fixedly connected with the nozzle.

Further, the nozzle is sequentially provided with an axial flow air duct, a rotational flow air duct, a coal air passage, a central air duct and an ignition passage from outside to inside; the combustion nozzle is also provided with a first adjusting mechanism and a second adjusting mechanism, and the first adjusting mechanism is used for adjusting the area of the cross section of the outlet of the axial flow air channel; the second adjusting mechanism is used for adjusting the area of the cross section of the outlet of the rotational flow air duct.

Furthermore, a first branch pipe, a second branch pipe and a third branch pipe are led out of the combustion-supporting air pipe; the first branch pipe is communicated with the axial flow air channel in the nozzle; the second branch pipe is communicated with a rotational flow air channel in the nozzle; the third branch pipe is communicated with a central air duct in the nozzle.

Drawings

Fig. 1 is a perspective view of a flame holding cover.

FIG. 2 is a schematic cross-sectional view of a flame-holding enclosure.

Fig. 3 is a sectional structural view of the combustion nozzle.

Fig. 4 is a structural view of a low-nitrogen burner.

Wherein: 10 flame gathering cylinders, 11 body parts, 12 necking parts, 20 protective cylinders, 100 combustion nozzles, 200 combustion-supporting air pipes, 201 axial flow air regulating valves, 202 rotational flow air regulating valves, 203 central air regulating valves, 204 side air compensators and 300 pulverized coal inlet pipes.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the utility model.

The embodiment provides a flame holding cover in a combustor, wherein the flame holding cover is installed at the front end of a nozzle in a matching mode so as to achieve the purposes of promoting pulverized coal combustion, improving combustion efficiency and ensuring stable combustion flame.

Specifically, referring to fig. 1 and 2, the flame holding cover includes a flame holding cylinder 10, the flame holding cylinder 10 includes a body 11 and a throat 12 disposed at one end of the body 11, and the throat 12 is disposed coaxially with the body 11.

The choke 12 here may be understood as narrowing the outlet of the body 11 so that the air flow and pulverized coal passing through the body 11 form a reverse flow vortex in the body 11; thereby further improving the mixing uniformity of the pulverized coal and the air flow and promoting the stability of combustion; meanwhile, the existence of the necking part 12 can further converge the generated flame, so that the flame is more stable.

Optionally, the structure of the throat portion 12 is similar to that of a truncated cone of a cylindrical structure, and the throat portion 12 is smoothly connected with one end of the body portion 11 to form a flame holding channel with a gradually changing structure; promoting the convergence effect of multiple flames.

Optionally, the body 11 and the throat 12 are integrally formed.

In this embodiment, in order to ensure the regular replacement of the flame holding cylinder, the flame holding cylinder 10 and the nozzle need to be detachably connected, so that a first connecting part is provided at one end of the body part 11 away from the throat part 12; the front end of the nozzle is provided with a second connecting part, and the second connecting part is matched with the first connecting part to enable the flame holding cylinder 10 to be detachably and fixedly connected with the nozzle.

The detachable structure is arranged, so that the structure of the combustion nozzle 100 formed by the nozzle and the flame holding cylinder 10 is convenient to use, and it should be noted that the detachable structure can be in a threaded connection mode or a quick-release buckle connection mode; such as a threaded connection; can set up the external screw thread on the first connecting portion, set up the internal thread on the second connecting portion, utilize the spiral of internal and external screw thread to close realization first connecting portion and dismantling of second connecting portion.

In a specific using process, the condition that the flame holding cylinder 10 is damaged and needs to be replaced in time occurs, but the temperature of the flame holding cylinder 10 is high at the moment, and an operator cannot dismount the flame holding cylinder in time at all; in order to prevent an emergency, a protective cylinder 20 is therefore also provided here.

Namely, the flame gathering cover also comprises a protective cylinder 20, and the protective cylinder 20 is sleeved on the flame gathering cylinder 10 and is coaxially arranged with the flame gathering cylinder 10; the inner diameter of the protective cylinder 20 is larger than the outer diameter of the flame holding cylinder 10 to form a thermal insulation space.

Because of the existence of the thermal insulation space, the high temperature generated on the surface of the flame holding cylinder 10 can not be directly and quickly transferred to the protective cylinder 20, so that the temperature of the protective cylinder 20 is always lower than that of the surface of the flame holding cylinder 10; when the operator carries out the disassembling operation, the whole flame-gathering cover can be disassembled by directly acting on the protective cylinder 20 by using a tool; effectively reducing the danger of operators.

The protective part of the protective cylinder 20 at least covers the body part 11 of the flame holding cylinder 10, and preferably, the protective cylinder 20 can cover the body part 11 and the necking part 12, so that the whole flame holding cylinder 10 is positioned under the protective cage of the protective cylinder 20, and potential safety hazards are avoided.

Optionally, a plurality of heat dissipation holes are formed in the protective cylinder 20 to facilitate cooling at a high temperature.

The traditional flame gathering cover with a straight cylindrical structure is designed into a flame gathering cover with a necking structure, and the gradual change structure formed by the necking part 12 and the body part 11 is utilized, so that gas and burning coal powder are further uniformly mixed after passing through the necking part 12, the finally formed flame is more stable, and the stability and reliability of burning are promoted; the protective cylinder 20 is arranged in the flame gathering cover, so that the practical operation of an operator is facilitated, and potential safety hazards are effectively eliminated.

The scheme also provides a combustion nozzle 100 in the combustor, and referring to fig. 3, the combustion nozzle 100 is composed of the nozzle and a flame holding cover, and the nozzle is sequentially provided with an axial flow air duct a, a rotational flow air duct B, a coal air duct C, a central air duct D and an ignition duct E from outside to inside; the nozzle is also provided with a first adjusting mechanism and a second adjusting mechanism, and the first adjusting mechanism is used for adjusting the area of the outlet section of the axial flow air duct A; the second adjusting mechanism is used for adjusting the area of the cross section of the outlet of the rotational flow air duct B.

The first adjusting mechanism and the second adjusting mechanism are used for adjusting the outlet section area of the axial flow air duct A and the outlet section area of the rotational flow air duct B respectively; therefore, the sectional areas of the outlet ends of the axial flow air duct A and the rotational flow air duct B are gradually reduced relative to the sectional area far away from the outlet end, an axial air outlet and a cyclone outlet with gradually reduced sectional areas are conveniently formed at the outlets of the axial flow air duct A and the rotational flow air duct B respectively, the air pressure is increased when air flow is sprayed out by forming the air ducts with gradually narrowed sectional areas, when coal air is sprayed out in a rotational flow mode according to a certain diffusion angle (the arrow direction in the figure is the flowing direction of the air flow), the rotational flow air and the axial flow air which are adjacent to each other are transmitted to the coal air, high momentum and momentum moment are transmitted to the coal air, the coal air and the coal air are mixed and spirally advance at high speed, and the coal powder is guaranteed to be mixed more uniformly and thoroughly.

The embodiment further provides a lime rotary kiln low-nitrogen burner, referring to fig. 4, which comprises a combustion-supporting air pipe 200 and the combustion nozzle 100 as described above, wherein a first branch pipe, a second branch pipe and a third branch pipe are led out from the combustion-supporting air pipe 200; the first branch pipe is communicated with an axial flow air duct A in the nozzle; the second branch pipe is communicated with a rotational flow air duct B in the nozzle; the third branch pipe is communicated with a central air duct D in the nozzle; meanwhile, an axial flow air adjusting valve 201 is arranged on the first branch pipe, a rotational flow air adjusting valve 202 is arranged on the second branch pipe, and a central air adjusting valve 203 is arranged on the third branch pipe; the three adjusting valves can be independently adjusted and also can be adjusted in a linkage manner, so that different requirements of the rotary kiln on the length and the strength of flame can be met, and the requirement for adjusting the shape of the flame is met.

In addition, a side air compensator 204 is further arranged on the combustion-supporting air pipe 200, and the structure of the side air compensator 204 is similar to that of the first adjusting mechanism or the second adjusting mechanism, and is used for adjusting and compensating the combustion-supporting air in the combustion-supporting air pipe 200.

The lime rotary kiln low-nitrogen burner is also provided with a pulverized coal inlet pipe 300, the pulverized coal inlet pipe 300 obliquely extends into the channel C at a certain angle and is welded on the burner, and the inner wall of the oblique pulverized coal inlet pipe 300 is provided with a wear-resistant ceramic chip which can prevent the pulverized coal from washing the pulverized coal inlet pipe 300.

Optionally, a cramp for increasing strength of the castable and a refractory castable protective layer are welded on the outermost side of the combustion nozzle 100 to protect the head of the whole combustor and the combustor air duct located in the kiln opening.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The lime rotary kiln low-nitrogen burner comprises a flame gathering cover with a flame gathering barrel (10), and is characterized in that the flame gathering barrel (10) comprises a body part (11) and a throat part (12) arranged at one end of the body part (11), and the throat part (12) and the body part (11) are coaxially arranged; one end of the body part (11) far away from the necking part (12) is provided with a first connecting part.

2. A lime rotary kiln low-nitrogen burner as claimed in claim 1, wherein the body portion (11) is smoothly connected with the throat portion (12) to form a flame holding channel with a gradual change structure.

3. A lime rotary kiln low-nitrogen burner as claimed in claim 2, wherein the body portion (11) and the throat portion (12) are of an integral structure.

4. The lime rotary kiln low-nitrogen burner as claimed in claim 1 or 3, wherein the flame holding hood further comprises a protective cylinder (20), the protective cylinder (20) is sleeved on the flame holding cylinder (10) and is coaxially arranged with the flame holding cylinder (10); the inner diameter of the protective cylinder (20) is larger than the outer diameter of the flame holding cylinder (10) to form a heat insulation space.

5. A lime rotary kiln low-nitrogen burner as claimed in claim 4, wherein the protective cylinder (20) covers at least the body part (11) of the flame holding cylinder (10).

6. The lime rotary kiln low-nitrogen burner as claimed in claim 5, wherein the protective cylinder (20) is provided with a plurality of heat dissipation holes.

7. The lime rotary kiln low-nitrogen burner as claimed in claim 6, further comprising a combustion nozzle having a nozzle, wherein the flame holding hood is installed at a front end of the nozzle.

8. The lime rotary kiln low-nitrogen burner as claimed in claim 7, wherein a second connecting part is arranged at the front end of the nozzle, and the second connecting part and the first connecting part are matched with each other to enable the flame holding cover and the nozzle to be detachably and fixedly connected.

9. The lime rotary kiln low-nitrogen burner as claimed in claim 8, wherein the nozzle is provided with an axial flow air duct A, a rotational flow air duct B, a coal air duct C, a central air duct D and an ignition duct E in sequence from outside to inside; the combustion nozzle is also provided with a first adjusting mechanism and a second adjusting mechanism, and the first adjusting mechanism is used for adjusting the area of the outlet section of the axial flow air duct A; the second adjusting mechanism is used for adjusting the area of the cross section of the outlet of the rotational flow air duct B.

10. The lime rotary kiln low-nitrogen burner as claimed in claim 9, further comprising a combustion-supporting air pipe (200), wherein a first branch pipe, a second branch pipe and a third branch pipe are led out from the combustion-supporting air pipe (200); the first branch pipe is communicated with the axial flow air channel in the nozzle; the second branch pipe is communicated with a rotational flow air channel in the nozzle; the third branch pipe is communicated with a central air duct in the nozzle.