Burner

Abstract

The present invention provides a burner, which relates to the technical field of heating devices. The burner provided by the present invention comprises: a channel tube and a burner tube group sleeved on the channel tube; the channel tube is adapted to an igniter and a compressed air nozzle, and one of the igniter and the compressed air nozzle is detachably inserted into the channel tube. In the burner provided by the present invention, after the igniter is inserted into the channel tube and the flame is ignited, the igniter can be withdrawn and the compressed air nozzle can be inserted into the channel tube, and the compressed air can disperse the coal powder, thereby making the burner suitable for the mixed combustion of low calorific value coal gas and coal powder.

Description

Technical Field

[0001] The invention relates to the technical field of heating devices, and in particular to a burner. Background Art

[0002] The multi-duct burner for lime rotary kiln is one of the key equipment of lime kiln in steel plant. The performance of this equipment directly affects the product quality, environmental protection, energy consumption and economic benefits of lime kiln in steel plant. At present, most of the multi-duct burners use pulverized coal as fuel or pulverized coal and gas as dual fuel to provide heat energy for lime calcining system, but the application of low calorific value gas is restricted. The working principle of the pulverized coal gas burner is to use high-speed jet wind and high-speed swirl wind, central wind and low-speed coal delivery wind to form a large speed difference jet, so that the airflow change and mixing performance at the front of the burner are optimized, thereby forming a uniform coal delivery, full combustion, and controllable combustion flame; in the lime plant that provides lime for steel and metallurgical enterprises, cheap low-calorific value coal gas can be obtained as fuel, but the coal gas may often have insufficient flow or lack due to maintenance and other reasons, resulting in poor mixing of coal powder and substandard flame shape. The means of increasing the swirl device to strengthen the mixing of coal powder often requires maintenance due to wear, which is unacceptable for the lime rotary kiln production process that requires long-term continuous operation, thereby restricting the application of low-calorific value coal gas in lime kiln production. However, the prior art lacks a burner that can be applied to lime kilns and uses low-calorific value coal gas. Summary of the invention

[0003] The object of the present invention is to provide a burner which is suitable for the mixed combustion of low calorific value coal gas and coal powder, and the igniter and the compressed air nozzle can be respectively inserted into the channel pipe.

[0004] In a first aspect, the present invention provides a burner comprising: a channel tube and a burner tube group sleeved on the channel tube;

[0005] The channel tube is adapted to the igniter and the compressed air nozzle, and one of the igniter and the compressed air nozzle is detachably inserted into the channel tube.

[0006] In combination with the first aspect, the present invention provides a first possible implementation manner of the first aspect, wherein the burner tube group includes a central air duct, the central air duct is coaxial with the channel tube, and the central air duct is sleeved with the channel tube;

[0007] A first annular cavity is formed between the central air duct and the channel tube.

[0008] In combination with the first possible implementation of the first aspect, the present invention provides a second possible implementation of the first aspect, wherein the end of the channel tube is connected to an annular plate, the annular plate covers the first annular cavity, and the annular plate is provided with a through hole.

[0009] In combination with the first possible implementation of the first aspect, the present invention provides a third possible implementation of the first aspect, wherein the burner tube group further includes a coal air duct, the coal air duct is coaxial with the channel tube, and the coal air duct is sleeved with the central air duct;

[0010] A second annular cavity is formed between the coal air duct and the central air duct.

[0011] In combination with the third possible implementation of the first aspect, the present invention provides a fourth possible implementation of the first aspect, wherein the burner pipe group further includes a gas pipe, the gas pipe is coaxial with the coal air pipe, and the gas pipe is sleeved with the coal air pipe;

[0012] A third annular cavity is formed between the coal gas pipe and the coal air pipe.

[0013] In combination with the fourth possible implementation manner of the first aspect, the present invention provides a fifth possible implementation manner of the first aspect, wherein a gas cyclone is provided between the coal air duct and the coal gas duct.

[0014] In combination with the fourth possible implementation manner of the first aspect, the present invention provides a sixth possible implementation manner of the first aspect, wherein the burner tube group further includes a swirl air duct, the swirl air duct is coaxial with the gas pipe, and the swirl air duct is sleeved with the gas pipe;

[0015] A fourth annular cavity is formed between the cyclone air pipe and the gas pipe.

[0016] In combination with the sixth possible implementation of the first aspect, the present invention provides a seventh possible implementation of the first aspect, wherein an air guide plate is provided between the gas pipe and the swirl air duct, and the air guide plate has an angle with a plane perpendicular to the axis of the gas pipe.

[0017] In combination with the sixth possible implementation manner of the first aspect, the present invention provides an eighth possible implementation manner of the first aspect, wherein the burner tube group further includes an axial flow air duct, the axial flow air duct is coaxial with the swirl air duct, and the axial flow air duct is sleeved with the swirl air duct;

[0018] A fifth annular cavity is formed between the axial flow air duct and the cyclone air duct.

[0019] In combination with the first aspect, the present invention provides a ninth possible implementation manner of the first aspect, wherein an outer sheath is provided on the outer side of the burner tube group.

[0020] The embodiments of the present invention bring the following beneficial effects: a channel tube is arranged by using a burner tube assembly, the channel tube is adapted for an igniter and a compressed air nozzle, and one of the igniter and the compressed air nozzle can be detachably inserted into the channel tube. After the igniter is inserted into the channel tube and the flame is ignited, the igniter can be pulled out and the compressed air nozzle can be inserted into the channel tube, and the compressed air can be used to disperse the coal powder, thereby making the burner suitable for the mixed combustion of low calorific value coal gas and coal powder.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A cross-sectional view of a burner provided by an embodiment of the present invention;

[0024] Figure 2 A left side view of a burner provided by an embodiment of the present invention;

[0025] Figure 3 A cross-sectional view of a burner provided in an embodiment of the present invention with the compressed air nozzle removed;

[0026] Figure 4 A schematic diagram of a compressed air nozzle of a burner provided in an embodiment of the present invention.

[0027] Icons: 001-channel tube; 002-burner tube group; 201-central air duct; 202-coal air duct; 203-gas pipe; 204-swirl air duct; 205-axial flow air duct; 003-compressed air nozzle; 301-injection hole; 004-first annular cavity; 005-annular plate; 501-through hole; 006-second annular cavity; 007-third annular cavity; 008-gas cyclone; 009-fourth annular cavity; 010-wind guide plate; 011-fifth annular cavity; 012-outer sheath. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Physical quantities in formulas, if not separately marked, should be understood as basic quantities of the base units of the International System of Units, or derived quantities derived from the basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Embodiment 1

[0032] like Figure 1 As shown, the burner provided by the embodiment of the present invention includes: a channel tube 001 and a burner tube group 002 sleeved on the channel tube 001; the channel tube 001 is adapted to the igniter and the compressed air nozzle 003, and the igniter and the compressed air nozzle 003 are selectively detachably inserted into the channel tube 001.

[0033] Specifically, the igniter is inserted into the channel tube 001, and after the flame is ignited, the igniter can be pulled out of the channel tube 001. By inserting the compressed air nozzle 003 into the channel tube 001, compressed air is sprayed through the compressed air nozzle 003, so that the coal powder is spread, thereby ensuring that the coal powder is fully in contact with the air to ensure that the fuel can be fully burned. The fuel can be mixed with coal gas and pulverized coal, and the fuel is ignited by the igniter. After the combustion is stable, the igniter is withdrawn and replaced with the compressed air nozzle 003.

[0034] In the embodiment of the present invention, the burner tube group 002 includes a central air duct 201, which is coaxial with the channel tube 001 and sleeved with the channel tube 001; a first annular cavity 004 is formed between the central air duct 201 and the channel tube 001.

[0035] Specifically, the first annular cavity 004 serves as a central air duct, and the compressed air nozzle 003 passes compressed air into the central air duct, and the coal powder is diffused by the compressed air. The flame can be adjusted by adjusting the flow rate of the compressed air nozzle 003.

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, the end of the channel tube 001 is connected to the annular plate 005 , the annular plate 005 covers the first annular cavity 004 , and the annular plate 005 is provided with a through hole 501 .

[0037] Specifically, the annular plate 005 is provided with a plurality of through holes 501 along the circumferential direction, and the plurality of through holes 501 are arranged at intervals along the circumferential direction. The through holes 501 are installed in coordination with the compressed air nozzle 003, and the jet of compressed air does not affect the passage of the central wind.

[0038] Furthermore, the burner tube group 002 also includes a coal air duct 202 , which is coaxial with the channel tube 001 , and the coal air duct 202 is sleeved with the central air duct 201 ; a second annular cavity 006 is formed between the coal air duct 202 and the central air duct 201 .

[0039] Specifically, the second annular cavity 006 serves as a coal-air passage, and the coal powder can be dispersed in the second annular cavity 006 under the action of compressed air, thereby ensuring that the coal powder is fully mixed with the air and fully burned.

[0040] Furthermore, the burner pipe group 002 also includes a gas pipe 203 , which is coaxial with the coal air pipe 202 , and the gas pipe 203 is sleeved with the coal air pipe 202 ; a third annular cavity 007 is formed between the gas pipe 203 and the coal air pipe 202 .

[0041] Specifically, the third annular cavity 007 can be used as a gas channel, the gas is dispersed in the third annular cavity 007, and the gas is fully mixed with the air, so as to achieve full combustion.

[0042] Furthermore, a gas cyclone 008 is provided between the coal air pipe 202 and the gas pipe 203 .

[0043] Specifically, the gas cyclone 008 can guide the gas in the third annular cavity 007 to flow around the coal air pipe 202, so that the gas and air are fully mixed. The gas is arranged in the outer ring of the coal powder. When the gas volume is sufficient, the supply of the swirl wind can be reduced. Since the swirl wind is not preheated, the fuel consumption can be further reduced.

[0044] Furthermore, the burner tube assembly 002 further includes a swirl air duct 204 , which is coaxial with the gas pipe 203 , and the swirl air duct 204 is sleeved with the gas pipe 203 ; a fourth annular cavity 009 is formed between the swirl air duct 204 and the gas pipe 203 .

[0045] Specifically, the fourth annular cavity 009 serves as a swirl wind channel. In order to enable the swirl wind channel to generate swirl wind, a swirl wind pipe 204 with a wedge-shaped cross-section is mounted on the outer periphery of the end of the gas pipe 203 .

[0046] Furthermore, an air guide plate 010 is provided between the gas pipe 203 and the swirl air pipe 204 , and the air guide plate 010 forms an angle with a plane perpendicular to the axis of the gas pipe 203 .

[0047] Specifically, a plurality of air guide plates 010 are provided, and the plurality of air guide plates 010 are arranged at intervals along the circumference of the swirl air duct 204. The plurality of air guide plates 010 can guide the airflow, so that the gas in the fourth annular cavity 009 flows around the gas pipe 203.

[0048] Furthermore, the burner tube group 002 also includes an axial flow air duct 205 , which is coaxial with the swirl air duct 204 , and the axial flow air duct 205 is sleeved with the swirl air duct 204 ; a fifth annular cavity 011 is formed between the axial flow air duct 205 and the swirl air duct 204 .

[0049] Specifically, the end of the axial flow air duct 205 is provided with an air duct end cover that closes the fifth annular cavity 011, and the air duct end cover is provided with a plurality of circular holes, which are arranged at intervals on the air duct end cover around the axis of the axial flow air duct 205. The central wind, the swirl wind, and the axial flow wind are ejected through the first annular cavity 004, the fourth annular cavity 009, and the fifth annular cavity 011, respectively, thereby providing power for the diffusion of the mixed fuel, thereby forming a five-channel burner suitable for a lime rotary kiln.

[0050] Furthermore, an outer sheath 012 is provided on the outer side of the burner tube group 002 .

[0051] Specifically, the outer sheath 012 is formed on the outside of the burner tube group 002 by casting, and the burner tube group 002 is wrapped by the outer sheath 012, so as to protect the burner tube group 002.

[0052] like Figure 1 and Figure 4 As shown, the compressed air nozzle 003 is provided with a plurality of injection holes 301, and the plurality of injection holes 301 are arranged at intervals along a spiral line extending circumferentially of the compressed air nozzle 003. Specifically, the compressed air is injected through the plurality of injection holes 301, which can ensure that the compressed air is dispersedly injected around the compressed air nozzle 003.

[0053] It should be noted that the outlet of the gas channel is recessed inwardly along the axis of the burner, and the overflowed coal powder can be accumulated at the outlet of the gas channel, thereby facilitating the cleaning of the accumulated coal powder.

[0054] In the conventional technology, the third annular cavity 007 (gas channel) of the burner suitable for high calorific value gas is relatively narrow. When there is no gas, a qualified flame shape can still be formed. However, the third annular cavity 007 (gas channel) suitable for low calorific value gas is relatively wide. When there is no gas, the swirl wind is far away from the coal powder and a qualified flame shape cannot be formed. The flame shape (diameter, length, high temperature zone and other parameters) has a decisive influence on production energy consumption and product quality. If a qualified flame shape cannot be formed, even if the burner can maintain combustion, normal production cannot be achieved. The working principle of the burner provided in this embodiment is as follows:

[0055] In order to make the low calorific value coal gas with a larger unit volume suitable for the burner, a third annular cavity 007 (gas channel) with a larger width (100mm~150mm) is used, the second annular cavity 006 is used as the coal powder channel, and the fourth annular cavity 009 is used as the swirl wind channel. Compressed air is sprayed through the compressed air nozzle 003 to push the coal powder to the swirl wind channel, so that the swirl wind and the coal powder can fully contact and mix to obtain a flame shape that meets the process requirements.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A burner, characterized in that: include: A channel tube (001) and a burner tube group (002) sleeved on the channel tube (001); The channel tube (001) is adapted to the igniter and the compressed air nozzle (003), and one of the igniter and the compressed air nozzle (003) is detachably inserted into the channel tube (001); The burner tube group (002) comprises a central air duct (201), the central air duct (201) is coaxial with the channel tube (001), and the central air duct (201) is sleeved with the channel tube (001); A first annular cavity (004) is formed between the central air duct (201) and the channel tube (001); The burner tube group (002) is sheathed on the outside with an outer sheath (012).

2. The burner according to claim 1, characterized in that The end of the channel tube (001) is connected to an annular plate (005), the annular plate (005) covers the first annular cavity (004), and the annular plate (005) is provided with a through hole (501).

3. The burner according to claim 1, characterized in that The burner tube group (002) further comprises a coal air pipe (202), wherein the coal air pipe (202) is coaxial with the channel tube (001), and the coal air pipe (202) is sleeved with the central air pipe (201); A second annular cavity (006) is formed between the coal air duct (202) and the central air duct (201).

4. The burner according to claim 3, characterized in that The burner tube assembly (002) further comprises a gas pipe (203), wherein the gas pipe (203) is coaxial with the coal air pipe (202), and the gas pipe (203) is sleeved with the coal air pipe (202); A third annular cavity (007) is formed between the coal gas pipe (203) and the coal air pipe (202).

5. The burner according to claim 4, characterized in that A coal gas cyclone (008) is provided between the coal air pipe (202) and the coal gas pipe (203).

6. The burner according to claim 4, characterized in that The burner tube assembly (002) further comprises a swirl air duct (204), wherein the swirl air duct (204) is coaxial with the gas pipe (203), and the swirl air duct (204) is sleeved with the gas pipe (203); A fourth annular cavity (009) is formed between the cyclone air duct (204) and the gas pipe (203).

7. The burner according to claim 6, characterized in that An air guide plate (010) is provided between the gas pipe (203) and the cyclone air pipe (204), and the air guide plate (010) forms an angle with a plane perpendicular to the axis of the gas pipe (203).

8. The burner according to claim 6, characterized in that The burner tube assembly (002) further comprises an axial flow air duct (205), wherein the axial flow air duct (205) is coaxial with the swirl air duct (204), and the axial flow air duct (205) is sleeved with the swirl air duct (204); A fifth annular cavity (011) is formed between the axial flow air duct (205) and the cyclone air duct (204).

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