Direct blowing type biomass burner

Abstract

The invention discloses a direct blowing type biomass burner, and relates to the technical field of biomass boilers or coal-fired boilers for mixed combustion of biomass. The problems that according to an existing biomass and coal co-combustion burner, biomass is prone to blockage, ignition stability is poor, burnout is low, and NOx emission is unstable are solved. A perturbed air pipe, a stable combustion air pipe and a combustion nozzle are sequentially connected end to end, the tail end of a conveying pipe is coaxially inserted into the perturbed air pipe and the stable combustion air pipe, the tail end of the conveying pipe is connected with a necking pipe, the tail end of the necking pipe extends into the combustion nozzle, and a partition annular plate is arranged in the joint of the perturbed air pipe and the stable combustion air pipe. The tail end of the perturbed air pipe is connected with a perturbed air inlet pipe, a dispersed perturbed air inlet is formed in the pipe section, extending into the perturbed air pipe, of the conveying pipe, a dispersed perturbed air pipe is inserted into the dispersed perturbed air inlet, the stable combustion air pipe is provided with a stable combustion air inlet, and a stable combustion air inlet pipe is inserted into the stable combustion air inlet. The biomass burner can be directly applied to a large coal-fired boiler.

Description

Technical Field

[0001] The invention relates to the technical field of biomass boilers or coal-fired boilers mixed with biomass, and in particular to a direct-blowing biomass burner. Background Art

[0002] As a green renewable energy, biomass can replace coal fuel in boilers and is one of the important means to develop renewable energy and control carbon emissions. At present, the application of biomass is mainly mixed combustion in large coal-fired boilers. The existing technology lacks biomass burners that can be directly applied to large coal-fired boilers. The existing biomass-coal mixed combustion burners are easy to clog with biomass, have poor ignition stability, low burnout, and unstable NOx emissions. In order to achieve efficient and stable combustion of biomass and large-scale application of biomass, it is urgent to develop a biomass burner. Summary of the invention

[0003] The purpose of the present invention is to solve the problems of easy biomass clogging, poor ignition stability, low burnout and unstable NOx emission in existing biomass-coal mixed combustion burners, and further provide a direct-blowing biomass burner.

[0004] The technical solution of the present invention is:

[0005] A direct-blowing biomass burner, the biomass burner comprises a delivery pipe 1, a swaying air pipe 2, a swaying air inlet pipe 3, a stable combustion air pipe 7, a shrinking pipe 8, a combustion nozzle 9, a partition annular plate 11, a plurality of dispersed swaying air pipes 4 and a plurality of stable combustion air inlet pipes 6, the swaying air pipe 2, the stable combustion air pipe 7 and the combustion nozzle 9 are coaxially connected from left to right in sequence along the axis BB direction of the biomass burner, the end of the delivery pipe 1 is coaxially inserted in the swaying air pipe 2 and the stable combustion air pipe 7 from left to right, the end of the delivery pipe 1 is connected with a coaxially arranged shrinking pipe 8, the end of the shrinking pipe 8 extends to the inside of the combustion nozzle 9, the swaying air pipe 2 and the stable combustion air pipe 7 are connected in sequence, and the swaying air pipe 2 and the stable combustion air pipe 7 are connected in sequence. A coaxially arranged dividing annular plate 11 is provided inside the intersection of the air ducts 7, and the inner and outer surfaces of the dividing annular plate 11 are respectively fixedly connected to the delivery pipe 1 and the dynamic air duct 2 and / or the stable combustion air duct 7, and the end of the dynamic air duct 2 is connected to the dynamic air inlet pipe 3, and the delivery pipe 1 extends into the inner pipe section of the dynamic air duct 2, and the outer surface of the pipe section is provided with a plurality of uniformly arranged scattered dynamic air inlets along the circumferential direction, and the plurality of dispersed dynamic air inlets are respectively inserted with a plurality of obliquely arranged scattered dynamic air ducts 4, and the outer surface of the stable combustion air duct 7 is provided with a plurality of uniformly arranged stable combustion air inlets along the circumferential direction, and the plurality of stable combustion air inlets are respectively inserted with a plurality of stable combustion air inlet pipes 6.

[0006] Furthermore, the undulating air inlet duct 3 includes an air duct, a transition duct and an elbow, which are connected end to end in sequence from top to bottom in the vertical direction, and the end of the elbow is coaxially fixedly connected to the head end of the undulating air duct 2, and an elbow through hole is opened on the elbow for avoiding the conveying pipe 1.

[0007] Furthermore, the angle between the axis of the dispersed and flexed air duct 4 and the axis of the delivery pipe 1 is α, α=10-20°.

[0008] Furthermore, the angle between the axis of the dispersed and flexed air duct 4 and the axis of the delivery pipe 1 is α, α=45°.

[0009] Furthermore, the combustion-stabilizing air inlet pipe 6 includes a flat pipe section and an inclined pipe section, the end of the inclined pipe section is obliquely inserted into the combustion-stabilizing air inlet of the combustion-stabilizing air pipe 7, and the head end of the inclined pipe section is coaxially fixedly connected with the end of the horizontally arranged flat pipe section.

[0010] Furthermore, the angle between the axis of the inclined pipe section of the combustion stabilizing air inlet pipe 6 and the axis of the delivery pipe 1 is β, β=30-60°.

[0011] Furthermore, the biomass burner also includes a fixed annular plate 5, which is coaxially sleeved on the flexing air duct 2. The fixed annular plate 5 is provided with a fixing hole for matching with the flat pipe section of the stable combustion air inlet pipe 6, and the end of the flat pipe section is inserted into the fixing hole.

[0012] Furthermore, the biomass burner also includes a plurality of loose air ducts 10, a plurality of loose air duct mounting holes evenly arranged in a circumferential direction are opened on the outer surface of the combustion stabilizing air duct 7, a plurality of loose air inlets coaxially arranged with the plurality of loose air duct mounting holes are opened on the outer side of the shrinking tube 8, and the ends of the plurality of loose air ducts 10 respectively radially pass through the plurality of loose air duct mounting holes of the combustion stabilizing air duct 7 from the outside to the inside and are inserted into the plurality of loose air inlets of the shrinking tube 8.

[0013] Furthermore, a plurality of combustion stabilizing air inlet pipes 6 and a plurality of loose air pipes 10 are alternately arranged along the circumferential direction.

[0014] Furthermore, the combustion stabilizing air duct 7 includes a straight pipe section and a tapered pipe section, the head end of the straight pipe section is coaxially connected to the end of the flexing air duct 2, the end of the straight pipe section is coaxially connected to the head end of the tapered pipe section, and the end of the tapered pipe section is coaxially connected to the head end of the combustion nozzle 9.

[0015] Compared with the prior art, the present invention has the following effects:

[0016] 1. The present invention is a biomass burner that can be directly applied to large boilers. The burner can be applied to biomass boilers or coal-fired boilers mixed with biomass. The burner is a safe, efficient and stable burner for burning biomass.

[0017] 2. The biomass of the present invention is carried into the conveying pipe 1 by the primary wind. The primary wind serves as both the conveying wind of the biomass and the initial combustion wind of the biomass combustion. The temperature of the primary wind is not higher than 90°C, which prevents the high-volatile biomass from catching fire and burning in the conveying pipe. The conveying pipe 1 passes through the elbow of the turbulent wind inlet pipe 3 and enters the turbulent wind pipe 2. On this section of the conveying pipe 1, there are circumferentially staggered scattered turbulent wind pipes 4 with fixed angles. The turbulent wind temperature is not higher than 200°C. The turbulent wind enters the conveying pipe 1 to prevent the biomass from sticking to the wall and thus clogging. The high-temperature turbulent wind is added to increase the wind temperature at this point in the conveying pipe 1, and the biomass initially precipitates volatiles, creating conditions for the subsequent ignition and combustion. The biomass with a small amount of volatiles in the conveying pipe 1 enters the constricted pipe 8, where the flow area is reduced after the diameter is reduced, and the mixture speed is increased, and enters the combustion nozzle 9.

[0018] 3. The stable combustion air duct 7 of the present invention is sleeved on the conveying pipe 1. The temperature of the stable combustion air is not higher than 400°C. The stable combustion air is delivered into the stable combustion air duct 7 by a plurality of stable combustion air inlet pipes 6 arranged in an annular direction. Here, the high-temperature stable combustion air increases the wall temperature of the shrinking pipe 8 through conduction heat exchange, thereby increasing the temperature of the biomass inside, and the volatile matter continues to precipitate. The stable combustion air also enters the combustion nozzle 9 through the shrinkage at the front end. Here, the high-temperature stable combustion air and the biomass are quickly mixed and heat-exchanged, and a large amount of volatile matter is precipitated, and the biomass is also preheated. The preheated biomass is sprayed into the furnace from the combustion nozzle 9, where the volatile matter first ignites and burns, igniting the preheated biomass.

[0019] 4. The loose air duct 10 of the present invention is arranged in an annular direction, passes through the stable combustion air duct 7 and is connected to the shrinking pipe 8. During normal operation, a small amount of air not higher than 200°C is introduced to prevent the biomass from flowing back. If blockage occurs, high-pressure air can be introduced from here to clean the blocked biomass. If there is a burning nozzle phenomenon during operation, high-pressure cold air can be introduced from here to push the flame away from the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a direct-blowing biomass burner of the present invention;

[0021] Figure 2 yes Figure 1 Section view at AA.

[0022] In the figure: 1. conveying pipe; 2. flexible air duct; 3. flexible air inlet duct; 4. dispersed flexible air duct; 5. fixed annular plate; 6. stable combustion air inlet duct; 7. stable combustion air duct; 8. shrinking pipe; 9. combustion nozzle; 10. loose air duct; 11. separating annular plate. DETAILED DESCRIPTION

[0023] Specific implementation method 1: Combination Figure 1 and Figure 2The present embodiment is described. The present embodiment is a direct-blowing biomass burner, and the biomass burner includes a delivery pipe 1, a shaking air pipe 2, a shaking air inlet pipe 3, a stable combustion air pipe 7, a shrinking pipe 8, a combustion nozzle 9, a partition annular plate 11, a plurality of dispersed shaking air pipes 4 and a plurality of stable combustion air inlet pipes 6. The shaking air pipe 2, the stable combustion air pipe 7 and the combustion nozzle 9 are coaxially connected end to end in sequence from left to right along the axis BB of the biomass burner. The end of the delivery pipe 1 is coaxially inserted in the shaking air pipe 2 and the stable combustion air pipe 7 from left to right. The end of the delivery pipe 1 is connected with a coaxially arranged shrinking pipe 8, and the end of the shrinking pipe 8 extends to the inside of the combustion nozzle 9. A coaxially arranged dividing annular plate 11 is provided inside the junction of the dynamic air duct 2 and the stable combustion air duct 7, and the inner and outer surfaces of the dividing annular plate 11 are respectively fixedly connected to the delivery pipe 1 and the dynamic air duct 2 and / or the stable combustion air duct 7, and a dynamic air inlet pipe 3 is connected to the end of the dynamic air duct 2, and the delivery pipe 1 extends into the inner pipe section of the dynamic air duct 2, and a plurality of uniformly arranged scattered dynamic air inlets are provided on the outer surface along the circumferential direction, and a plurality of obliquely arranged scattered dynamic air ducts 4 are respectively inserted in the plurality of dispersed dynamic air inlets, and a plurality of uniformly arranged stable combustion air inlets are provided on the outer surface of the stable combustion air duct 7 along the circumferential direction, and a plurality of stable combustion air inlets are respectively inserted in the plurality of stable combustion air inlets.

[0024] The partition annular plate 11 is connected to the delivery pipe 1, the deflection air pipe 2 and the combustion stabilizing air pipe 7 by welding.

[0025] Specific implementation method 2: Combination Figure 1 and Figure 2 To explain this embodiment, the distorted wind inlet pipe 3 of this embodiment includes an air duct, a transition pipe and an elbow. The air duct, the transition pipe and the elbow are connected in sequence from top to bottom in the vertical direction. The end of the elbow is coaxially fixedly connected to the head end of the distorted wind duct 2. The elbow is provided with an elbow through hole for avoiding the conveying pipe 1. In this way, the distorted wind passes through the air duct, the transition pipe and the elbow in sequence into the distorted wind duct 2, and then flows into the conveying pipe 1 and the shrinking pipe 8 through the dispersed distorted wind duct 4. The other components and connection relationships are the same as those of the first specific embodiment.

[0026] Specific implementation method three: Combination Figure 1 and Figure 2 This embodiment is described. The angle between the axis of the dispersed flexing air duct 4 and the axis of the conveying pipe 1 is α, α = 10-20°. In this way, the conveying pipe 1 is arranged with the dispersed flexing air duct 4 in the part inside the flexing air duct 2. The dispersed flexing air duct 4 is arranged at an angle and staggered in the annular direction on the conveying pipe 1. The other components and connection relationships are the same as those of the first or second specific embodiments.

[0027] Specific implementation method four: Combination Figure 1 and Figure 2To illustrate this embodiment, the angle between the axis of the dispersed flexing air duct 4 and the axis of the delivery pipe 1 is α, α = 45°. This arrangement allows the flexing air flowing out of the dispersed flexing air duct 4 to flow smoothly into the delivery pipe 1 and the shrinking pipe 8. The other components and connection relationships are the same as those of the first, second or third embodiments.

[0028] Specific implementation method five: Combination Figure 1 and Figure 2 To explain this embodiment, the stable combustion air inlet pipe 6 of this embodiment includes a flat pipe section and an inclined pipe section. The end of the inclined pipe section is obliquely inserted into the stable combustion air inlet of the stable combustion air pipe 7, and the head end of the inclined pipe section is coaxially fixedly connected with the end of the horizontally arranged flat pipe section. In this way, the stable combustion air pipe 7 is sleeved on the conveying pipe 1, and the stable combustion air temperature is not higher than 400°C. The stable combustion air is sent into the stable combustion air pipe 7 by multiple circumferentially arranged stable combustion air inlet pipes 6. Here, the high-temperature stable combustion air increases the wall temperature of the shrinking pipe 8 through conduction heat exchange, thereby increasing the temperature of the biomass inside, and the volatile matter continues to precipitate. The stable combustion air also enters the combustion nozzle 9 through the front end shrinkage. Here, the high-temperature stable combustion air and the biomass are quickly mixed and heat-exchanged, and a large amount of volatile matter is precipitated, and the biomass is also preheated. The preheated biomass is sprayed into the furnace from the combustion nozzle 9, where the volatile matter first ignites and burns, igniting the preheated biomass. The other components and connection relationships are the same as those of the specific embodiments one, two, three or four.

[0029] Specific implementation method six: Combination Figure 1 and Figure 2 To illustrate this embodiment, the angle between the axis of the oblique pipe section of the stable combustion air inlet pipe 6 and the axis of the delivery pipe 1 is β, β = 30-60°. In this way, the oblique pipe section of the stable combustion air inlet pipe 6 matches the inclination of the conical pipe section of the stable combustion air pipe 7, so that the stable combustion air flowing out of the stable combustion air inlet pipe 6 smoothly enters the combustion nozzle 9. The other components and connection relationships are the same as those of the specific embodiments one, two, three, four or five.

[0030] Specific implementation method seven: Combination Figure 1 and Figure 2 To explain this embodiment, the biomass burner of this embodiment further comprises a fixed annular plate 5, which is coaxially sleeved on the flexing air duct 2, and a fixing hole for matching with the flat pipe section of the stable combustion air inlet pipe 6 is opened on the fixed annular plate 5, and the end of the flat pipe section is inserted into the fixing hole. In this way, the fixed annular plate 5 is used to fix the stable combustion air inlet pipe 6. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five or six.

[0031] The fixed annular plate 5 and the flexible air duct 2 are connected by welding.

[0032] Specific implementation method eight: Combination Figure 1 and Figure 2To illustrate this embodiment, the biomass burner of this embodiment also includes a plurality of loose air ducts 10, and the outer surface of the stable combustion air duct 7 is provided with a plurality of loose air duct mounting holes evenly arranged in the circumferential direction, and the outer side of the shrinking tube 8 is provided with a plurality of loose air inlets coaxially arranged with the plurality of loose air duct mounting holes, and the ends of the plurality of loose air ducts 10 respectively pass through the plurality of loose air duct mounting holes of the stable combustion air duct 7 from the outside to the inside in radial direction and are inserted into the plurality of loose air inlets of the shrinking tube 8. In this way, the loose air duct 10 is arranged circumferentially through the stable combustion air duct 7 and connected to the shrinking tube 8 during normal operation, and a small amount of air not higher than 200°C is introduced to prevent the biomass from flowing back. If blockage occurs, high-pressure air can be introduced from here to clean the blocked biomass. If there is a burning nozzle phenomenon during operation, high-pressure cold air can be introduced from here to push the flame away from the nozzle. The other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five, six or seven.

[0033] Specific implementation method nine: Combination Figure 1 and Figure 2 To explain this embodiment, the plurality of stable combustion air inlet pipes 6 and the plurality of loose air pipes 10 of this embodiment are arranged alternately along the circumferential direction. This arrangement ensures that the stable combustion air flowing out of the stable combustion air inlet pipes 6 and the air flowing out of the loose air pipes 10 will not interfere with each other. The other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five, six, seven or eight.

[0034] Specific implementation method ten: Combination Figure 1 and Figure 2 To explain this embodiment, the combustion stabilizing air duct 7 of this embodiment includes a straight pipe section and a tapered pipe section, the head end of the straight pipe section is coaxially connected to the end of the distorting air duct 2, the end of the straight pipe section is coaxially connected to the head end of the tapered pipe section, and the end of the tapered pipe section is coaxially connected to the head end of the combustion nozzle 9. In this way, the end of the combustion stabilizing air duct 7 close to the combustion nozzle 9 is designed as a closed structure for connecting to the combustion nozzle 9. The other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five, six, seven, eight or nine.

[0035] How it works

[0036] Combination Figure 1 and Figure 2 The working principle of a direct-blowing biomass burner of the present invention is described as follows:

[0037] The biomass is carried into the conveying pipe 1 by the primary wind. The primary wind serves as both the conveying wind of the biomass and the initial combustion wind of the biomass combustion. The temperature of the primary wind is not higher than 90°C, which prevents the high-volatile biomass from catching fire and burning in the conveying pipe. The conveying pipe 1 passes through the elbow of the turbulent wind inlet pipe 3 and enters the turbulent wind pipe 2. On this section of the conveying pipe 1, there are circumferentially staggered scattered turbulent wind pipes 4 with fixed angles. The turbulent wind temperature is not higher than 200°C. The turbulent wind enters the conveying pipe 1 to prevent the biomass from sticking to the wall and thus clogging. The high-temperature turbulent wind is added to increase the wind temperature at this point of the conveying pipe 1, and the biomass initially precipitates volatiles, creating conditions for the subsequent ignition and combustion. The biomass with a small amount of volatiles in the conveying pipe 1 enters the constricted pipe 8, where the flow area is reduced after the diameter is reduced, and the mixture speed is increased, and enters the combustion nozzle 9.

[0038] The stable combustion air duct 7 is sleeved on the conveying pipe 1. The temperature of the stable combustion air is not higher than 400°C. The stable combustion air is sent into the stable combustion air duct 7 by multiple circumferentially arranged stable combustion air inlet pipes 6. Here, the high-temperature stable combustion air increases the wall temperature of the shrinking pipe 8 through conduction heat exchange, thereby increasing the temperature of the biomass inside, and the volatile matter continues to precipitate. The stable combustion air also enters the combustion nozzle 9 through the front end shrinkage. Here, the high-temperature stable combustion air and the biomass are quickly mixed and heat-exchanged, and a large amount of volatile matter is precipitated, and the biomass is also preheated. The preheated biomass is sprayed into the furnace from the combustion nozzle 9, where the volatile matter first ignites and burns, igniting the preheated biomass.

[0039] The loose air duct 10 is arranged in an annular direction and passes through the stable combustion air duct 7 to connect to the shrinking pipe 8. During normal operation, a small amount of air with a temperature not higher than 200°C is introduced to prevent the biomass from flowing back. If blockage occurs, high-pressure air can be introduced from here to clean the blocked biomass. If there is a burning nozzle during operation, high-pressure cold air can be introduced from here to push the flame away from the nozzle.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A direct-blowing biomass burner, characterized in that: The biomass burner comprises a conveying pipe (1), a swaying air pipe (2), a swaying air inlet pipe (3), a combustion stabilizing air pipe (7), a constricted pipe (8), a combustion nozzle (9), a partition annular plate (11), a plurality of dispersed swaying air pipes (4) and a plurality of combustion stabilizing air inlet pipes (6); the swaying air pipe (2), the combustion stabilizing air pipe (7) and the combustion nozzle (9) are coaxially connected end to end in sequence from left to right along the axis (BB) of the biomass burner; the end of the conveying pipe (1) is coaxially inserted in the swaying air pipe (2) and the combustion stabilizing air pipe (7) in sequence from left to right; the end of the conveying pipe (1) is connected to a coaxially arranged constricted pipe (8); the end of the constricted pipe (8) extends to the interior of the combustion nozzle (9); the swaying air pipe (2) and the combustion nozzle (9) are coaxially connected in sequence from left to right. A coaxially arranged dividing annular plate (11) is provided inside the intersection of the flame stabilizing air duct (7); the inner and outer surfaces of the dividing annular plate (11) are respectively fixedly connected to the conveying pipe (1) and the oscillating air duct (2) and / or the flame stabilizing air duct (7); the end of the oscillating air duct (2) is connected to the oscillating air inlet pipe (3); the conveying pipe (1) extends into the inner pipe section of the oscillating air duct (2); the outer surface of the pipe section is provided with a plurality of evenly arranged dispersed oscillating air inlets along the circumferential direction; the plurality of dispersed oscillating air inlets are respectively inserted with a plurality of obliquely arranged dispersed oscillating air ducts (4); the outer surface of the flame stabilizing air duct (7) is provided with a plurality of evenly arranged flame stabilizing air inlets along the circumferential direction; the plurality of flame stabilizing air inlets are respectively inserted with a plurality of flame stabilizing air inlet pipes (6).

2. A direct-blowing biomass burner according to claim 1, characterized in that: The distorted air inlet pipe (3) comprises an air duct, a transition pipe and an elbow. The air duct, the transition pipe and the elbow are connected in sequence from top to bottom in a vertical direction. The end of the elbow is coaxially fixedly connected to the head end of the distorted air duct (2). The elbow is provided with an elbow through hole for avoiding the conveying pipe (1).

3. A direct-blowing biomass burner according to claim 1 or 2, characterized in that: The angle between the axis of the dispersed flexing air duct (4) and the axis of the conveying pipe (1) is α, and α=10-20°.

4. A direct-blowing biomass burner according to claim 3, characterized in that: The angle between the axis of the dispersed and distorted air duct (4) and the axis of the delivery pipe (1) is α, α=45°.

5. A direct-blowing biomass burner according to claim 4, characterized in that: The combustion-stabilizing air inlet pipe (6) comprises a flat pipe section and an inclined pipe section, the end of the inclined pipe section is obliquely inserted into the combustion-stabilizing air inlet of the combustion-stabilizing air pipe (7), and the head end of the inclined pipe section is coaxially fixedly connected to the end of the horizontally arranged flat pipe section.

6. A direct-blowing biomass burner according to claim 5, characterized in that: The angle between the axis of the inclined pipe section of the combustion-stabilizing air inlet pipe (6) and the axis of the conveying pipe (1) is β, β=30-60°.

7. A direct-blowing biomass burner according to claim 6, characterized in that: The biomass burner also includes a fixed annular plate (5), which is coaxially sleeved on the undulating air duct (2), and a fixing hole for matching with the flat pipe section of the stable combustion air inlet pipe (6) is opened on the fixed annular plate (5), and the end of the flat pipe section is inserted into the fixing hole.

8. A direct-blowing biomass burner according to claim 7, characterized in that: The biomass burner also includes a plurality of loose air ducts (10), the outer surface of the combustion stabilizing air duct (7) is provided with a plurality of loose air duct mounting holes evenly arranged in the circumferential direction, the outer side surface of the shrinking tube (8) is provided with a plurality of loose air inlets coaxially arranged with the plurality of loose air duct mounting holes, and the ends of the plurality of loose air ducts (10) respectively pass through the plurality of loose air duct mounting holes of the combustion stabilizing air duct (7) radially from the outside to the inside and are inserted into the plurality of loose air inlets of the shrinking tube (8).

9. A direct-blowing biomass burner according to claim 8, characterized in that: A plurality of combustion-stabilizing air inlet pipes (6) and a plurality of loose air pipes (10) are arranged alternately along the circumferential direction.

10. A direct-blowing biomass burner according to claim 9, characterized in that: The combustion stabilizing air duct (7) comprises a straight pipe section and a tapered pipe section, wherein the head end of the straight pipe section is coaxially connected to the end of the undulating air duct (2), the end of the straight pipe section is coaxially connected to the head end of the tapered pipe section, and the end of the tapered pipe section is coaxially connected to the head end of the combustion nozzle (9).

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