Combustor and method of operation

Abstract

The burner comprises a body, a pulverized coal pipe, a ventilation pipe assembly and a valve assembly, the body is provided with a cavity, the pulverized coal pipe is arranged in the cavity, one end of the pulverized coal pipe extends into a backflow area of the cavity, the pulverized coal pipe is provided with a coal outlet, the coal outlet is communicated with the backflow area, and the ventilation pipe assembly is arranged on the pulverized coal pipe in a sleeving mode. The ventilation pipe assembly is provided with a first flow channel, a second flow channel and a third flow channel which are sequentially arranged from inside to outside and all communicated with the backflow area, the valve assembly comprises a first adjusting valve, a second adjusting valve and a third adjusting valve, and the first adjusting valve is arranged at an air inlet of the first flow channel and used for adjusting the air volume introduced into the first flow channel; the second adjusting valve is arranged at the air inlet of the second flow channel and used for adjusting the air quantity introduced into the second flow channel, and the third adjusting valve is arranged at the air inlet of the third flow channel and used for adjusting the air quantity introduced into the third flow channel. The combustor is suitable for different coal types and is high in adaptability.

Description

Technical Field

[0001] The present invention relates to the technical field of burners, and in particular to a burner and an operating method thereof. Background Art

[0002] The deep peak-shaving operation of coal-fired power units is an important measure to promote the construction of a new energy system and steadily achieve the "dual carbon" goals. In this context, it is urgent to develop low-load stable combustion technologies with good operating economy and reliability. Compared with the commonly used ignition and stable combustion technologies such as plasma ignition and oil-assisted combustion, the idea of ​​using a small amount of coal powder to burn first to ignite and stabilize the main coal powder airflow (referred to as "coal-to-coal" technology) is considered to have obvious advantages in terms of economy and reliability.

[0003] Among the related technologies, reverse injection combustion technology is considered to be an ignition and stable combustion technology with great application prospects due to its innovative combustion organization mode. It can strengthen the rapid heating and ignition of coal powder and stable combustion by constructing a high-temperature recirculation zone inside the combustion chamber. It can be fully adapted to the technical idea of ​​"coal igniting coal". However, when using reverse injection combustion technology with different types of coal, due to the change of fuel characteristics, the burner is prone to fluctuations during operation and has low reliability. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides a burner and an operating method.

[0006] The burner according to the embodiment of the present invention comprises:

[0007] A body, the body having a chamber, one end of the chamber having a reflow zone;

[0008] A pulverized coal pipe, the pulverized coal pipe is arranged in the chamber and one end of the pulverized coal pipe extends into the recirculation zone, the pulverized coal pipe has a coal outlet, and the coal outlet is connected to the recirculation zone;

[0009] A ventilation pipe assembly, wherein the ventilation pipe assembly is sleeved on the pulverized coal pipe, and the ventilation pipe assembly comprises a first flow channel, a second flow channel and a third flow channel which are sequentially arranged from the inside to the outside, wherein the first flow channel, the second flow channel and the third flow channel are all connected to the recirculation zone to ventilate the recirculation zone, so as to facilitate the combustion of pulverized coal in the recirculation zone;

[0010] A valve assembly, the valve assembly includes a first regulating valve, a second regulating valve and a third regulating valve, the first regulating valve is arranged at the air inlet of the first flow channel, and is used to adjust the air volume passing into the first flow channel, the second regulating valve is arranged at the air inlet of the second flow channel, and is used to adjust the air volume passing into the second flow channel, and the third regulating valve is arranged at the air inlet of the third flow channel, and is used to adjust the air volume passing into the third flow channel.

[0011] In the burner of the embodiment of the present invention, the arrangement of the first flow channel, the second flow channel and the third flow channel constructs a three-layer rotating air flow that is wrapped sequentially from the inside to the outside, which fully provides oxygen for the coal powder in the recirculation zone, helps to form a low-pressure zone inside the air flow, so as to promote the suction effect of the high-temperature airflow and the formation of the recirculation zone. The size of the wind flow in the first flow channel, the second flow channel and the third flow channel is adjusted by adjusting valves to adjust the size of the diffusion range when the wind flows out of the flow channel. For example, the radial width of the overall swirl wind can be reduced by closing or reducing the opening of the first regulating valve, the second regulating valve and the third regulating valve in turn, so as to adjust the radial width of the recirculation zone, thereby improving the coal type adaptability of the burner, and the adjustment process is simple to operate, flexible and effective.

[0012] In some embodiments, the burner also includes a guide assembly, which includes a first guide member, a second guide member and a third guide member. The first guide member is arranged on the first flow channel and is adjacent to the recirculation zone to adjust the wind direction of the wind passing from the first flow channel into the recirculation zone. The second guide member is arranged on the second flow channel and is adjacent to the recirculation zone to adjust the wind direction of the wind passing from the second flow channel into the recirculation zone. The third guide member is arranged on the third flow channel and is adjacent to the recirculation zone to adjust the wind direction of the wind passing from the third flow channel into the recirculation zone.

[0013] In some embodiments, the ventilation pipe assembly includes a fixed pipe, a first air pipe, a second air pipe and a third air pipe arranged in sequence from the inside to the outside, the fixed pipe is sleeved on the pulverized coal pipe and connected to the pulverized coal pipe, the first flow channel is formed between the outer circumference of the fixed pipe and the inner circumference of the first air pipe, the first flow guide is arranged between the outer circumference of the fixed pipe and the inner circumference of the first air pipe and is arranged around the inner circumference of the first air pipe,

[0014] The second flow channel is formed between the outer circumference of the first air duct and the inner circumference of the second air duct, and the second flow guide is arranged between the outer circumference of the first air duct and the inner circumference of the second air duct and around the inner circumference of the second air duct.

[0015] The third flow channel is formed between the outer circumference of the second air duct and the inner circumference of the third air duct, and the third flow guide is arranged between the outer circumference of the second air duct and the inner circumference of the third air duct and around the inner circumference of the third air duct.

[0016] In some embodiments, the first flow guide member includes a plurality of first flow guide vanes, which are evenly spaced along the inner circumference of the first air duct; the second flow guide member includes a plurality of second flow guide vanes, which are evenly spaced along the inner circumference of the second air duct; and the third flow guide member includes a plurality of third flow guide vanes, which are evenly spaced along the inner circumference of the third air duct.

[0017] In some embodiments, an angle a is formed between an extension direction of the first guide plate and an extension direction of the first air duct, 30°≤a≤80°; an angle b is formed between an extension direction of the second guide plate and an extension direction of the second air duct, 30°≤b≤80°; an angle c is formed between an extension direction of the third guide plate and an extension direction of the third air duct, 30°≤c≤80°.

[0018] In some embodiments, the burner further comprises:

[0019] a first branch pipe, the first branch pipe being arranged at one end of the first air duct away from the first flow guide, the first branch pipe having a first air inlet, through which ventilation is conducted into the first flow channel, and the first regulating valve being arranged at the first air inlet;

[0020] a second branch pipe, the second branch pipe being arranged at one end of the second air duct away from the second flow guide, the second branch pipe having a second air inlet, through which ventilation is conducted into the second flow channel, and the second regulating valve being arranged at the second air inlet;

[0021] The third branch pipe is arranged at one end of the third air duct away from the third flow guide member, the third branch pipe has a third air inlet, ventilation is provided into the third flow channel through the third air inlet, and the third regulating valve is arranged at the third air inlet.

[0022] In some embodiments, the burner further comprises a main pipe, the main pipe being in communication with the first air inlet, the second air inlet and the third air inlet, and ventilation is provided to the first air inlet, the second air inlet and the third air inlet through the main pipe.

[0023] The third air duct has a tube cavity at one end adjacent to the third branch pipe, the tube cavity is connected to the third branch pipe, and the cross-sectional area of ​​the inner peripheral contour of the tube cavity is greater than the cross-sectional area of ​​the inner peripheral contour of the third flow channel.

[0024] In some embodiments, the burner also includes an end plate and a connecting block, the end plate is arranged at one end of the ventilation duct assembly away from the recirculation zone, the fixed pipe, the first air duct, the second air duct and the third air duct are all fixedly connected to the end plate, and the connecting block is arranged between the outer circumferential surface of the pulverized coal pipe and the inner circumferential surface of the fixed pipe.

[0025] In some embodiments, the pulverized coal pipe, the fixed pipe, the first air duct, the second air duct and the third air duct are coaxially arranged.

[0026] The operating method of the burner according to the embodiment of the present invention comprises:

[0027] Introduce air into the main pipe, and open the first regulating valve, the second regulating valve and the third regulating valve to allow air to flow into the first flow channel, the second flow channel and the third flow channel;

[0028] The wind in the first flow channel flows into the recirculation zone through the first flow guide, the wind in the second flow channel flows into the recirculation zone through the second flow guide, and the wind in the third flow channel flows into the recirculation zone through the third flow guide;

[0029] The openings of the first regulating valve, the second regulating valve, and the third regulating valve are adjusted to adjust the diffusion range of the wind flowing out of the guide member.

[0030] The operating method of the burner in the embodiment of the present invention adjusts the size of the airflow in the first flow channel, the second flow channel and the third flow channel through the regulating valve to adjust the size of the diffusion range when the wind flows out of the flow channel. For example, the radial width of the overall swirl wind can be reduced by closing or reducing the opening of the first regulating valve, the second regulating valve and the third regulating valve in sequence, thereby adjusting the radial width of the recirculation zone, thereby improving the coal type adaptability of the burner, and the adjustment process is simple to operate, flexible and effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a cross-sectional view of a burner according to an embodiment of the present invention.

[0032] Figure 2 2 is a front view of a burner according to an embodiment of the present invention.

[0033] Figure numerals: 1. main body; 11. chamber; 12. reflux zone; 2. pulverized coal pipe; 21. coal outlet; 3. ventilation pipe assembly; 31. fixed pipe; 32. first air duct; 33. second air duct; 34. third air duct; 35. first flow channel; 36. second flow channel; 37. third flow channel; 4. valve assembly; 41. first regulating valve; 42. second regulating valve; 43. third regulating valve; 5. flow guide assembly; 51. first flow guide member; 52. second flow guide member; 53. third flow guide member; 61. first branch pipe; 611. first air inlet; 62. second branch pipe; 621. second air inlet; 63. third branch pipe; 631. third air inlet; 632. pipe cavity; 71. main pipe; 72. end plate; 73. connecting block. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0035] like Figure 1-Figure 2 As shown, the burner of the embodiment of the present invention comprises a body 1, a pulverized coal pipe 2, a ventilation pipe assembly 3 and a valve assembly 4. The body 1 extends along a first direction (eg Figure 1 The left and right directions shown in the figure) and have a chamber 11, one end of the chamber 11 (as shown in the figure) Figure 1 The right end of the chamber 11 shown in FIG. 1 has a recirculation zone 12. The pulverized coal pipe 2 is arranged in the chamber 11 and extends along the first direction. The left end of the pulverized coal pipe 2 extends out of the left end of the body 1. One end of the pulverized coal pipe 2 (as shown in FIG. 1 ) is provided with a recirculation zone 12. Figure 1 The right end of the pulverized coal pipe 2 shown extends into the recirculation zone 12 . The right end of the pulverized coal pipe 2 has a coal outlet 21 . The coal outlet 21 is connected to the recirculation zone 12 . The pulverized coal pipe 2 is used to introduce pulverized coal into the recirculation zone 12 .

[0036] The ventilation pipe assembly 3 is sleeved on the pulverized coal pipe 2, and the ventilation pipe assembly 3 has a first flow channel 35, a second flow channel 36 and a third flow channel 37 arranged from the inside to the outside. The first flow channel 35, the second flow channel 36 and the third flow channel 37 all extend along the first direction and are connected to the recirculation zone 12 to ventilate the recirculation zone 12 to facilitate the combustion of pulverized coal in the recirculation zone 12.

[0037] Specifically, the wind flowing out from the first flow channel 35 forms an annular airflow arranged circumferentially around the coal powder pipe 2, the wind flowing out from the second flow channel 36 forms an annular airflow arranged circumferentially around the first flow channel 35, and the wind flowing out from the third flow channel 37 forms an annular airflow arranged circumferentially around the second flow channel 36. Thus, the wind flowing out from the first flow channel 35, the second flow channel 36 and the third flow channel 37 form a three-layer rotating air flow that is wrapped from the inside to the outside in sequence, which fully provides oxygen for the coal powder in the recirculation zone 12, helps to form a low-pressure zone inside the air flow, promotes the suction effect of the high-temperature airflow and the formation of the recirculation zone 12, and the annular airflow can also reduce the temperature of the inner wall surface of the recirculation zone 12 in the recirculation zone 12, effectively preventing the coal powder from adhering to the inner wall surface of the recirculation zone 12 and coking.

[0038] Specifically, the pulverized coal pipe 2 is in the shape of a slender strip. The pulverized coal pipe 2 and the ventilation pipe assembly 3 increase the aspect ratio of the burner, making it easy for the burner of the embodiment of the present invention to extend into the main pulverized coal burner of the power station boiler, which is convenient for the actual layout of the present invention.

[0039] The valve assembly 4 includes a first regulating valve 41, a second regulating valve 42 and a third regulating valve 43. The first regulating valve 41 is provided at the air inlet at the left end of the first flow channel 35, and is used to adjust the air volume entering the first flow channel 35. The second regulating valve 42 is provided at the air inlet at the left end of the second flow channel 36, and is used to adjust the air volume entering the second flow channel 36. The third regulating valve 43 is provided at the air inlet at the left end of the third flow channel 37, and is used to adjust the air volume entering the third flow channel 37.

[0040] Specifically, the size of the wind flow in the first flow channel 35, the second flow channel 36 and the third flow channel 37 is adjusted by the regulating valve to adjust the size of the diffusion range when the wind flows out of the flow channel. For example, the radial width of the overall swirl wind can be reduced by closing or reducing the opening of the first regulating valve 41, the second regulating valve 42 and the third regulating valve 43 in sequence, thereby adjusting the radial width of the recirculation zone 12 (such as Figure 1 The radial width D) shown is helpful for the combustion of different types of coal in the recirculation zone 12, thereby improving the coal type adaptability of the burner of the embodiment of the present invention, and the adjustment process is simple, flexible and effective.

[0041] In some embodiments, the burner further includes a guide assembly 5, which includes a first guide member 51, a second guide member 52, and a third guide member 53. The first guide member 51 is disposed at the right end of the first flow channel 35 and adjacent to the recirculation zone 12 to adjust the wind direction of the wind passing from the first flow channel 35 into the recirculation zone 12. The second guide member 52 is disposed at the right end of the second flow channel 36 and adjacent to the recirculation zone 12 to adjust the wind direction of the wind passing from the second flow channel 36 into the recirculation zone 12. The third guide member 53 is disposed at the right end of the third flow channel 37 and adjacent to the recirculation zone 12 to adjust the wind direction of the wind passing from the third flow channel 37 into the recirculation zone 12.

[0042] Specifically, the provision of the guide member can effectively improve the turbulent flow condition of the wind, reduce energy consumption and wind resistance, and ensure a more stable wind flow, thereby ensuring the stable combustion of the coal powder in the recirculation zone 12 .

[0043] In some embodiments, the ventilation pipe assembly 3 includes a fixed pipe 31, a first air pipe 32, a second air pipe 33 and a third air pipe 34 arranged in sequence from the inside to the outside. The fixed pipe 31 is sleeved on the pulverized coal pipe 2 and connected to the pulverized coal pipe 2, and the pulverized coal pipe 2, the fixed pipe 31, the first air pipe 32, the second air pipe 33 and the third air pipe 34 are coaxially arranged.

[0044] The first flow channel 35 is formed between the outer circumference of the fixed tube 31 and the inner circumference of the first air duct 32, so that the annular airflow flowing out of the first flow channel 35 is arranged around the inner circumference of the first air duct 32. The first flow guide 51 is arranged between the outer circumference of the fixed tube 31 and the inner circumference of the first air duct 32 and around the inner circumference of the first air duct 32.

[0045] The second flow channel 36 is formed between the outer circumference of the first air duct 32 and the inner circumference of the second air duct 33, so that the annular airflow flowing out of the second flow channel 36 is arranged around the inner circumference of the second air duct 33. The second air guide 52 is arranged between the outer circumference of the first air duct 32 and the inner circumference of the second air duct 33 and around the inner circumference of the second air duct 33.

[0046] The third flow channel 37 is formed between the outer circumference of the second air duct 33 and the inner circumference of the third air duct 34, so that the annular airflow flowing out of the third flow channel 37 is arranged around the inner circumference of the third air duct 34. The third air guide 53 is arranged between the outer circumference of the second air duct 33 and the inner circumference of the third air duct 34 and around the inner circumference of the third air duct 34.

[0047] In some embodiments, the first guide member 51 includes a plurality of first guide vanes (not shown), which are evenly spaced along the inner circumference of the first air duct 32. The second guide member 52 includes a plurality of second guide vanes (not shown), which are evenly spaced along the inner circumference of the second air duct 33. The third guide member 53 includes a plurality of third guide vanes (not shown), which are evenly spaced along the inner circumference of the third air duct 34.

[0048] Specifically, the guide vane is used to guide the axial wind jet flowing through it into a rotating wind jet having both axial velocity and tangential velocity, so as to expand the diffusion range of the annular airflow and improve the combustion efficiency of the coal powder in the recirculation zone 12.

[0049] In some embodiments, an angle a is formed between the extension direction of the first guide plate and the extension direction of the first air duct 32, 30°≤a≤80°. An angle b is formed between the extension direction of the second guide plate and the extension direction of the second air duct 33, 30°≤b≤80°. An angle c is formed between the extension direction of the third guide plate and the extension direction of the third air duct 34, 30°≤c≤80°.

[0050] Specifically, by setting the size of angle a, angle b or angle c, the inclination of the guide vane is adjusted, and then the guide vane is adjusted to improve the turbulent condition of the wind, reduce energy consumption and wind resistance, and further ensure a smoother wind flow, so that the coal powder burns stably in the recirculation zone 12 and adapts to the combustion of different types of coal.

[0051] In some embodiments, the burner further includes a first branch pipe 61, a second branch pipe 62, and a third branch pipe 63. The first branch pipe 61 is disposed at the left end of the first air duct 32, and the central axis of the first branch pipe 61 is orthogonal to the central axis of the first air duct 32. The first branch pipe 61 has a first air inlet 611, through which ventilation is conducted into the first flow channel 35, and the first regulating valve 41 is disposed at the first air inlet 611, and the air volume entering the first air duct 32 is adjusted by adjusting the opening of the first air inlet 611, so as to facilitate operation.

[0052] The second branch pipe 62 is arranged at the left end of the second air duct 33, and the central axis of the second branch pipe 62 is orthogonal to the central axis of the second air duct 33. The second branch pipe 62 has a second air inlet 621, through which ventilation is conducted into the second flow channel 36, and the second regulating valve 42 is arranged at the second air inlet 621, and the air volume entering the second air duct 33 is adjusted by adjusting the opening of the second air inlet 621, so as to facilitate operation.

[0053] The third branch pipe 63 is arranged at the left end of the third air duct 34, and the central axis of the third branch pipe 63 is orthogonal to the central axis of the third air duct 34. The third branch pipe 63 has a third air inlet 631, through which ventilation is conducted into the third flow channel 37, and the third regulating valve 43 is arranged at the third air inlet 631, and the air volume entering the third air duct 34 is adjusted by adjusting the opening of the third air inlet 631, which is convenient for operation.

[0054] In some embodiments, the burner further includes a main pipe 71. The main pipe 71 is connected to the first air inlet 611, the second air inlet 621 and the third air inlet 631, and ventilation is provided to the first air inlet 611, the second air inlet 621 and the third air inlet 631 through the main pipe 71. Specifically, the wind is firstly introduced into the main pipe 71, and the wind in the main pipe 71 is then divided and flows into the first air inlet 611, the second air inlet 621 and the third air inlet 631 respectively.

[0055] The third air duct 34 has a lumen 632 at one end adjacent to the third branch pipe 63 . The lumen 632 is connected to the third branch pipe 63 . The cross-sectional area of ​​the inner circumference of the lumen 632 is greater than the cross-sectional area of ​​the inner circumference of the third flow channel 37 .

[0056] Specifically, the wind entering the third flow channel 37 through the third branch pipe 63 can be first stored in the tube cavity 632, and then continuously supplied to the third flow channel 37 from the tube cavity 632, thereby ensuring the continuity of the wind in the third flow channel 37.

[0057] In some embodiments, the burner further includes an end plate 72 and a connecting block 73. The end plate 72 is a circular flat plate, and the end plate 72 is disposed at one end of the ventilation pipe assembly 3 away from the recirculation zone 12 (such as Figure 1 The left end of the ventilation pipe assembly 3 shown in the figure), the left end of the fixed pipe 31, the left end of the first air pipe 32, the left end of the second air pipe 33 and the left end of the third air pipe 34 are all fixed and sealed to the end plate 72 to ensure the sealing of the first flow channel 35, the second flow channel 36 and the tube cavity 632. The connecting block 73 is arranged between the outer circumference of the pulverized coal pipe 2 and the inner circumference of the fixed pipe 31 and is arranged around the outer circumference of the pulverized coal pipe 2 to separate the inner circumference of the fixed pipe 31 from the outer circumference of the pulverized coal pipe 2.

[0058] The operating method of the burner according to the embodiment of the present invention comprises:

[0059] Wind is introduced into the main pipe 71 , and the first regulating valve 41 , the second regulating valve 42 and the third regulating valve 43 are opened to allow wind to flow into the first flow channel 35 , the second flow channel 36 and the third flow channel 37 .

[0060] The wind in the first flow channel 35 flows into the reflow zone 12 through the first flow guide 51 , the wind in the second flow channel 36 flows into the reflow zone 12 through the second flow guide 52 , and the wind in the third flow channel 37 flows into the reflow zone 12 through the third flow guide 53 .

[0061] The openings of the first regulating valve 41 , the second regulating valve 42 , and the third regulating valve 43 are adjusted to adjust the diffusion range of the wind flowing out of the air guide.

[0062] Specifically, the wind flows into the main pipe 71, and then is divided into three streams and flows into the first branch pipe 61, the second branch pipe 62, and the third branch pipe 63 respectively. Then, the air flow flowing into the first branch pipe 61 flows into the first flow channel 35, flows from left to right, and finally flows into the reflow zone 12 under the rotation and guidance of the first guide member 51. The air flow flowing into the second branch pipe 62 flows into the second flow channel 36, flows from left to right, and finally flows into the reflow zone 12 under the rotation and guidance of the second guide member 52. The air flow flowing into the third branch pipe 63 flows into the third flow channel 37, flows from left to right, and finally flows into the reflow zone 12 under the rotation and guidance of the third guide member 53.

[0063] Through the above-mentioned wind flow organization structure, a three-layer rotating air flow wrapped from the inside to the outside can be constructed in the recirculation zone 12, which provides oxygen for the coal powder combustion and helps to construct a low-pressure area inside the rotating air flow, promotes the entrainment effect of the high-temperature airflow and the formation of the recirculation zone 12. At the same time, the radial width of the overall swirl wind can be reduced (such as 1 / 4 of the radial width of the entire swirl wind) by closing or reducing the valve openings on the first branch pipe 61, the second branch pipe 62, and the third branch pipe 63 in sequence. Figure 1 The width D shown in the figure is adjusted to achieve the purpose of adjusting the radial width of the high-temperature recirculation zone 12, thereby improving the adaptability and combustion efficiency of the burner to different types of coal.

[0064] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0068] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A burner, characterized in that: include: A body (1), the body (1) having a chamber (11), one end of the chamber (11) having a reflow zone (12); a pulverized coal pipe (2), the pulverized coal pipe (2) being arranged in the chamber (11) and one end of the pulverized coal pipe (2) extending into the recirculation zone (12), the pulverized coal pipe (2) having a coal outlet (21), the coal outlet (21) being in communication with the recirculation zone (12); a ventilation pipe assembly (3), the ventilation pipe assembly (3) being sleeved on the pulverized coal pipe (2), the ventilation pipe assembly (3) comprising a first flow channel (35), a second flow channel (36) and a third flow channel (37) arranged in sequence from the inside to the outside, the first flow channel (35), the second flow channel (36) and the third flow channel (37) all being connected to the recirculation zone (12) so as to ventilate the recirculation zone (12) and facilitate the combustion of pulverized coal in the recirculation zone (12); A valve assembly (4), the valve assembly (4) comprising a first regulating valve (41), a second regulating valve (42) and a third regulating valve (43), the first regulating valve (41) being arranged at the air inlet of the first flow channel (35) for regulating the air volume passing into the first flow channel (35), the second regulating valve (42) being arranged at the air inlet of the second flow channel (36) for regulating the air volume passing into the second flow channel (36), and the third regulating valve (43) being arranged at the air inlet of the third flow channel (37) for regulating the air volume passing into the third flow channel (37).

2. The burner according to claim 1, characterized in that The invention also comprises a flow guide component (5), wherein the flow guide component (5) comprises a first flow guide member (51), a second flow guide member (52) and a third flow guide member (53), wherein the first flow guide member (51) is arranged on the first flow channel (35) and is adjacent to the recirculation zone (12) so as to adjust the wind direction of wind passing from the first flow channel (35) into the recirculation zone (12), the second flow guide member (52) is arranged on the second flow channel (36) and is adjacent to the recirculation zone (12) so as to adjust the wind direction of wind passing from the second flow channel (36) into the recirculation zone (12), and the third flow guide member (53) is arranged on the third flow channel (37) and is adjacent to the recirculation zone (12) so as to adjust the wind direction of wind passing from the third flow channel (37) into the recirculation zone (12).

3. The burner according to claim 2, characterized in that The ventilation pipe assembly (3) comprises a fixed pipe (31), a first air pipe (32), a second air pipe (33) and a third air pipe (34) which are arranged in sequence from the inside to the outside; the fixed pipe (31) is sleeved on the pulverized coal pipe (2) and connected to the pulverized coal pipe (2); the first flow channel (35) is formed between the outer circumference of the fixed pipe (31) and the inner circumference of the first air pipe (32); the first flow guide (51) is arranged between the outer circumference of the fixed pipe (31) and the inner circumference of the first air pipe (32) and is arranged around the inner circumference of the first air pipe (32); The second flow channel (36) is formed between the outer peripheral surface of the first air duct (32) and the inner peripheral surface of the second air duct (33); the second flow guide (52) is arranged between the outer peripheral surface of the first air duct (32) and the inner peripheral surface of the second air duct (33) and is arranged around the inner peripheral surface of the second air duct (33); The third flow channel (37) is formed between the outer peripheral surface of the second air duct (33) and the inner peripheral surface of the third air duct (34), and the third flow guide (53) is arranged between the outer peripheral surface of the second air duct (33) and the inner peripheral surface of the third air duct (34) and is arranged around the inner peripheral surface of the third air duct (34).

4. The burner according to claim 3, characterized in that The first flow guide member (51) comprises a plurality of first flow guide plates, which are evenly spaced along the inner circumference of the first air duct (32); the second flow guide member (52) comprises a plurality of second flow guide plates, which are evenly spaced along the inner circumference of the second air duct (33); and the third flow guide member (53) comprises a plurality of third flow guide plates, which are evenly spaced along the inner circumference of the third air duct (34).

5. The burner according to claim 4, characterized in that An angle a is formed between the extension direction of the first guide plate and the extension direction of the first air duct (32), 30°≤a≤80°; an angle b is formed between the extension direction of the second guide plate and the extension direction of the second air duct (33), 30°≤b≤80°; an angle c is formed between the extension direction of the third guide plate and the extension direction of the third air duct (34), 30°≤c≤80°.

6. The burner according to claim 5, characterized in that Also includes: a first branch pipe (61), the first branch pipe (61) being arranged at one end of the first air duct (32) away from the first flow guide member (51), the first branch pipe (61) having a first air inlet (611), through which air is ventilated into the first flow channel (35), and the first regulating valve (41) being arranged at the first air inlet (611); a second branch pipe (62), the second branch pipe (62) being arranged at one end of the second air duct (33) away from the second air guide member (52), the second branch pipe (62) having a second air inlet (621), through which air is ventilated into the second flow channel (36), and the second regulating valve (42) being arranged at the second air inlet (621); A third branch pipe (63), the third branch pipe (63) being arranged at one end of the third air duct (34) away from the third flow guide member (53), the third branch pipe (63) having a third air inlet (631), through which ventilation is conducted into the third flow channel (37), and the third regulating valve (43) being arranged at the third air inlet (631).

7. The burner according to claim 6, characterized in that It also comprises a main pipe (71), wherein the main pipe (71) is in communication with the first air inlet (611), the second air inlet (621) and the third air inlet (631), and ventilation is provided to the first air inlet (611), the second air inlet (621) and the third air inlet (631) through the main pipe (71). The third air duct (34) has a tube cavity (632) at one end adjacent to the third branch pipe (63), the tube cavity (632) is connected to the third branch pipe (63), and the cross-sectional area of ​​the inner circumference contour of the tube cavity (632) is greater than the cross-sectional area of ​​the inner circumference contour of the third flow channel (37).

8. The burner according to claim 3, characterized in that It also includes an end plate (72) and a connection block (73), wherein the end plate (72) is arranged at one end of the ventilation pipe assembly (3) away from the recirculation zone (12), the fixed pipe (31), the first air pipe (32), the second air pipe (33) and the third air pipe (34) are all fixedly connected to the end plate (72), and the connection block (73) is arranged between the outer peripheral surface of the pulverized coal pipe (2) and the inner peripheral surface of the fixed pipe (31).

9. The burner according to claim 3, characterized in that The pulverized coal pipe (2), the fixed pipe (31), the first air pipe (32), the second air pipe (33) and the third air pipe (34) are coaxially arranged.

10. A burner operation method, characterized in that: include: Air is introduced into the main pipe (71), and the first regulating valve (41), the second regulating valve (42) and the third regulating valve (43) are opened to allow air to flow into the first flow channel (35), the second flow channel (36) and the third flow channel (37); The wind in the first flow channel (35) flows into the recirculation zone (12) through the first flow guide (51), the wind in the second flow channel (36) flows into the recirculation zone (12) through the second flow guide (52), and the wind in the third flow channel (37) flows into the recirculation zone (12) through the third flow guide (53); The openings of the first regulating valve (41), the second regulating valve (42) and the third regulating valve (43) are adjusted to adjust the diffusion range of the wind flowing out of the guide member.

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