A swirl burner

Abstract

The present invention relates to the technical field of swirl burners, and in particular to a swirl burner, comprising a burner body, wherein a feed pipe is installed at one end of the burner body located outside the furnace, a main primary air nozzle is installed at one end of the burner body located inside the furnace, a main air box is installed outside the main primary air nozzle, an air guide pipe is installed at the bottom of the burner body, a limiting sleeve is fixed inside a limiting column on the air guide pipe, an adjusting pipe is sleeved on the air guide pipe, a sealing sleeve is installed at the junction of the outside of the adjusting pipe and the air guide pipe, an exhaust air duct is installed on the side of the end of the adjusting pipe opposite to the air guide pipe, an exhaust air nozzle is installed at the other end of the exhaust air duct, and an exhaust air box is installed outside the exhaust air nozzle. The present invention facilitates the adjustment of the position of the exhaust air duct, so that the exhaust air flow is separated from the primary air main flow, thereby reducing the interference of the exhaust air flow on the flow field of the main flame and reducing the generation of fuel-type NO.

Description

Technical Field

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

[0002] At present, when pulverized coal boilers are burning, especially those burning coal with low reaction characteristics, such as lean coal and anthracite, pulverized coal boilers generally use concentrated enhanced ignition burners. This type of burner divides the primary air of the pulverized coal pipeline into two parts: the main primary air of the burner and the exhaust air. The main primary air carries 85% to 90% of the pulverized coal and about 50% of the air into the furnace for combustion, and the exhaust air carries the remaining 10% to 15% of the pulverized coal and 50% of the air from the exhaust air pipeline into the furnace. This method of sending primary air into the furnace mainly plays a role in concentrating the primary air. The concentration of secondary pulverized coal reduces the ignition heat required for the ignition of low-volatile pulverized coal, which is beneficial to the ignition and stable combustion of low-reactivity coal. For boilers using concentrated swirl burners, the arrangement of this exhaust air nozzle is relatively simple in structure, but because the exhaust air nozzle is close to the main burner, the exhaust air flow is easy to interfere with the main flame, which is not conducive to the low-load stable combustion of the boiler. At the same time, the low-temperature exhaust air introduced into the furnace will interfere with the aerodynamic field of the main burner, reducing the ignition and stable combustion performance of the main burner, especially under low-load conditions with low average furnace temperature.

[0003] The burner and exhaust air nozzle are arranged in a concentrated manner on the front and rear walls, resulting in a high oxygen content in the area near the main burner. The burner is supplied with a relatively sufficient amount of air in the early stage of ignition and combustion. Since a large amount of oxygen in the air fully intervenes in the combustion process, fuel-type NO is often generated in large quantities, which is not conducive to reducing NOx stratification. In addition, the existing swirl burner cannot adjust the positions of the exhaust air nozzle and the main primary air nozzle according to the actual situation of the installation furnace, and is quite restrictive. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art that the position of the exhaust air nozzle of the swirl burner cannot be adjusted and the use of the burner is restricted, and a swirl burner is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A swirl burner is designed, comprising a burner body, the burner body is installed through a furnace, a feed pipe is installed at one end of the burner body located outside the furnace, a main primary air nozzle is installed at one end of the burner body located inside the furnace, a main air box is installed outside the main primary air nozzle, an air guide pipe is installed at the bottom of the burner body, a plurality of limiting holes are evenly opened around one end of the bottom of the air guide pipe connected to the burner body along the length direction, a plurality of limiting columns are evenly fixed around the outer side of the other end of the air guide pipe, and the guide pipe is installed at the bottom of the burner body. A limiting sleeve is fixed on the air duct inside the limiting column, an adjusting tube is sleeved on the air guide tube, a sealing sleeve is installed at the junction of the outside of the adjusting tube and the air guide tube, a ring is installed on the outside of the other end of the sealing sleeve, a number of limiting bolts are evenly installed on the outside of the ring along the circumferential direction, a number of mounting holes are evenly opened on the bottom of the side of the adjusting tube opposite to the air guide tube along the circumferential direction, an exhaust air duct is installed on the side of the end of the adjusting tube opposite to the air guide tube, an exhaust air nozzle is installed on the other end of the exhaust air duct, and an exhaust air box is installed on the outside of the exhaust air nozzle.

[0007] Preferably, the main air box and the exhaust air box are both arranged outside the furnace.

[0008] Preferably, a compensator and a sealing expansion joint are provided on the exhaust air duct.

[0009] Preferably, the positions of the limiting holes and the limiting columns are staggered, and the sizes of the limiting holes and the limiting bolts match.

[0010] Optionally, the height of the limiting column matches the depth of the mounting hole, and the limiting column matches the size of the mounting hole.

[0011] Preferably, the height of the regulating pipe is greater than the height of the mounting hole, and a fixing sleeve is installed at the junction of the exhaust air duct and the regulating pipe.

[0012] Preferably, the burner bodies are installed in layers relative to each other inside the furnace.

[0013] Preferably, the limiting column and the air guide duct are an integrated structure.

[0014] The swirl burner proposed by the present invention has the following beneficial effects:

[0015] 1. By installing the air guide pipe, regulating pipe and exhaust air duct in sequence, the exhaust air nozzle and the main primary air nozzle can be separated, which is convenient for stable combustion of the boiler at low load and improves combustion efficiency.

[0016] 2. The exhaust air guiding operation can be completed by the mutual engagement between the limit holes and limit columns on the air guide duct and the limit bolts and mounting holes on the adjusting tube. At the same time, the positional relationship between the exhaust air nozzle and the main primary nozzle can be adjusted, which is convenient for the equipment installers to adjust the position of the exhaust air duct according to actual conditions, thereby improving the flexibility and practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view structural schematic diagram of a swirl burner proposed by the present invention;

[0018] Figure 2 A schematic diagram of the structure of a regulating tube of a swirl burner proposed by the present invention;

[0019] Figure 3 A schematic diagram of the air guide tube structure of a swirl burner proposed by the present invention;

[0020] Figure 4 This is a bottom view of the structure of an adjustment tube of a swirl burner proposed by the present invention;

[0021] Figure 5 It is a schematic diagram of the exhaust air injection system of the swirl burner involved in the present invention.

[0022] In the figure: feed pipe 1, burner body 2, air guide pipe 3, regulating pipe 4, main air box 5, main primary air nozzle 6, exhaust air duct 7, exhaust air box 8, exhaust air nozzle 9, limit hole 10, collar 11, limit bolt 12, fixing sleeve 13, limit column 14, limit sleeve 15, mounting hole 16, sealing sleeve 17, furnace 18, compensator 19, sealing expansion joint 20. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Reference Figure 1-5A swirl burner includes a burner body 2, which is installed through a furnace 18. The burner body 2 is relatively installed in layers inside the furnace 18 to improve the combustion efficiency. A feed pipe 1 is installed at one end of the burner body 2 located outside the furnace 18, a main primary air nozzle 6 is installed at one end of the burner body 2 located inside the furnace 18, and a main air box 5 is installed outside the main primary air nozzle 6. An air guide 3 is installed at the bottom of the burner body 2, and the bottom of the air guide 3 is uniformly opened along the length direction at one end connected to the burner body 2. There are a number of limit holes 10, and a number of limit columns 14 are evenly fixed along the circumference of the outer side of the other end of the air duct 3. The limit columns 14 and the air duct 3 are an integrated structure to improve the structural strength of the device. The positions of the limit holes 10 and the limit columns 14 are staggered, and the sizes of the limit holes 10 and the limit bolts 12 match, which is convenient for sealing between the air duct 3 and the regulating tube 4 and can improve the stability of the device. A limit sleeve 15 is fixed inside the limit column 14 on the air duct 3 to prevent the exhaust air from flowing back and overflowing the connecting gap between the air duct 3 and the regulating tube 4.

[0025] The air duct 3 is sleeved with an adjusting tube 4, a sealing sleeve 17 is installed at the junction of the outer side of the adjusting tube 4 and the air duct 3, a collar 11 is installed on the outer side of the other end of the sealing sleeve 17, and a plurality of limiting bolts 12 are evenly installed along the circumferential direction on the outer side of the collar 11, and a plurality of mounting holes 16 are evenly opened along the circumferential direction at the bottom of the side of the adjusting tube 4 opposite to the air duct 3, the height of the limiting column 14 matches the depth of the mounting hole 16, and the size of the limiting column 14 matches the size of the mounting hole 16, which is convenient for the installation of the adjusting tube 4, the height of the adjusting tube 4 is greater than the height of the mounting hole 16, and the exhaust air duct 7 and the adjusting tube 4 A fixing sleeve 13 is installed at the joint to improve the installation stability of the exhaust air duct 7 and will not affect the normal operation of the regulating pipe 4. The exhaust air duct 7 is installed on the side of the end of the regulating pipe 4 opposite to the air guide pipe 3, and an exhaust air nozzle 9 is installed at the other end of the exhaust air duct 7. An exhaust air wind box 8 is installed on the outside of the exhaust air nozzle 9. The main air wind box 5 and the exhaust air wind box 8 are both arranged on the outside of the furnace 18, which can maintain the normal operation of the swirl burner. A compensator 19 and a sealing expansion joint 20 are arranged on the exhaust air duct 7, which can reduce the thermal stress deformation of the exhaust air duct 7 and increase the service life of the exhaust air duct.

[0026] The present invention, by sequentially installing the air guide duct 3, the regulating tube 4 and the exhaust air duct 7, enables the exhaust air nozzle 9 to be separated from the main primary air nozzle 6, which is convenient for low-load stable combustion of the boiler and improves combustion efficiency. The exhaust air guiding operation can be completed by the mutual clamping between the limiting holes 10 and the limiting columns 14 on the air guide duct 3 and the limiting bolts 12 and the mounting holes 16 on the regulating tube 4. At the same time, the positional relationship between the exhaust air nozzle 9 and the main primary nozzle 6 can be adjusted, which is convenient for equipment installers to adjust the position of the exhaust air duct 7 according to actual conditions, thereby improving the flexibility of the device.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A swirl burner, comprising a burner body (2), the burner body (2) being installed through a furnace (18), a feed pipe (1) being installed at one end of the burner body (2) located outside the furnace (18), a main primary air nozzle (6) being installed at one end of the burner body (2) located inside the furnace (18), a main air box (5) being installed outside the main primary air nozzle (6), characterized in that: An air guide tube (3) is installed at the bottom of the burner body (2); a plurality of limiting holes (10) are evenly opened around one end of the bottom of the air guide tube (3) connected to the burner body (2) along the length direction; a plurality of limiting columns (14) are evenly fixed around the outer side of the other end of the air guide tube (3); a limiting sleeve (15) is fixed inside the limiting column (14) on the air guide tube (3); an adjusting tube (4) is sleeved on the air guide tube (3); a sealing sleeve is installed at the connection between the outer side of the adjusting tube (4) and the air guide tube (3) (17), a collar (11) is installed on the outer side of the other end of the sealing sleeve (17), and a plurality of limit bolts (12) are evenly installed on the outer side of the collar (11) along the circumferential direction; a plurality of mounting holes (16) are evenly opened on the bottom of the side of the regulating tube (4) opposite to the air guide tube (3) along the circumferential direction; an exhaust air duct (7) is installed on the side of the end of the regulating tube (4) opposite to the air guide tube (3); an exhaust air nozzle (9) is installed on the other end of the exhaust air duct (7), and an exhaust air bellows (8) is installed on the outer side of the exhaust air nozzle (9); The main air blower box (5) and the exhaust air blower box (8) are both arranged outside the furnace (18); The exhaust air duct (7) is provided with a compensator (19) and a sealing expansion joint (20).

2. A swirl burner according to claim 1, characterized in that: The positions of the limiting holes (10) and the limiting columns (14) are staggered, and the sizes of the limiting holes (10) and the limiting bolts (12) match.

3. A swirl burner according to claim 1, characterized in that: The height of the limiting column (14) matches the depth of the mounting hole (16), and the size of the limiting column (14) matches the size of the mounting hole (16).

4. A swirl burner according to claim 1, characterized in that: The height of the regulating pipe (4) is greater than the height of the mounting hole (16), and a fixing sleeve (13) is installed at the junction of the exhaust air duct (7) and the regulating pipe (4).

5. A swirl burner according to claim 1, characterized in that: The burner bodies (2) are installed in layers relative to each other inside the furnace (18).

6. A swirl burner according to claim 1, characterized in that: The limiting column (14) and the air guide pipe (3) are an integrated structure.

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