Pulverized coal washing prevention device outside plasma generator

Abstract

The invention relates to the technical field of boilers, in particular to a plasma generator external pulverized coal scouring prevention device which comprises an elbow assembly, a right-angle pipeline, an open hole formed in the surface of the right-angle pipeline and a positioning plate arranged on the edge of the open hole. The fixing assembly comprises a fixing pipe, a rotating pipe arranged on the surface of the fixing pipe, a telescopic plate arranged at one end of the rotating pipe and a one-way plate arranged on the surface of the rotating pipe; when pulverized coal airflow flows through the interior of the right-angle pipeline, gas drives the rotating pipe to rotate through the one-way plate, the plasma combustor is wrapped through the fixed pipe, the periphery drives pulverized coal to turn through the rotating rotating pipe and the telescopic plate, and the situation that the pulverized coal directly scours the surface of the fixed pipe is avoided; meanwhile, the one-way plate pushed by pulverized coal air flow can further form vortex, pulverized coal can be concentrated in the middle of the pipeline, the speed of the pulverized coal entering the combustion chamber is increased, and stability of flames in the combustion chamber is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of boilers, in particular to a device for preventing coal powder from scouring the outside of a plasma generator. Background Art

[0002] The plasma burner elbow refers to a high-temperature resistant curved pipe component connected between the plasma ignition burner outlet and the boiler combustion area; its core function is to adjust the injection direction of the high-temperature flame ejected by the plasma torch so that it enters the boiler furnace at a specific angle to achieve precise ignition and stable combustion.

[0003] The plasma burner is arranged inside the elbow, but since the coal powder air flow also enters from the bottom of the elbow, the coal powder scours the plasma burner for a long time, causing the service life of the plasma burner to decrease. Therefore, a plasma generator external anti-coal powder scouring device is proposed to solve the above problem. Summary of the Invention

[0004] The present invention aims to provide a device for preventing coal dust scouring outside a plasma generator, which aims to solve the problem that the existing coal dust air flow continuously scours the plasma burner, causing damage to the plasma burner.

[0005] The present invention proposes the following technical solution: a device for preventing coal dust from scouring the outside of a plasma generator, comprising:

[0006] An elbow assembly includes a right-angle pipe, an opening provided on a surface of the right-angle pipe, and a positioning plate provided on an edge of the opening; and

[0007] The fixing assembly includes a fixing tube, a rotating tube arranged on the surface of the fixing tube, a telescopic plate arranged at one end of the rotating tube, and a one-way plate arranged on the surface of the rotating tube; wherein,

[0008] When the coal powder air flow flows through the inside of the right-angle pipe, the gas drives the rotating tube to rotate through the one-way plate, and the telescopic plate slides on the surface of the positioning plate.

[0009] As a preferred embodiment of the device for preventing coal dust scouring outside the plasma generator of the present invention: a rotating groove is provided on the surface of the fixed tube, a rotating block is fixed on the inner surface of the rotating tube, and the rotating block is rotatably connected to the rotating groove.

[0010] As a preferred embodiment of the device for preventing coal dust scouring outside the plasma generator of the present invention: a receiving groove is provided inside the rotating tube, a spring is provided inside the rotating tube, the spring is fixedly connected to the telescopic plate, and the telescopic plate is slidably connected to the receiving groove.

[0011] As a preferred embodiment of the device for preventing coal dust scouring outside the plasma generator of the present invention: a rotating groove is provided on the surface of the telescopic plate, a rotating ball is rotatably connected inside the rotating groove, and the rotating ball contacts the surface of the positioning plate.

[0012] As a preferred embodiment of the device for preventing coal dust scouring outside a plasma generator of the present invention, an inlet and an outlet are respectively provided at both ends of the right-angle pipe, and a flange is provided at the edge of the outlet.

[0013] As a preferred embodiment of the device for preventing coal dust scouring outside the plasma generator of the present invention: a connecting disk is fixed to one end of the fixed pipe.

[0014] As a preferred embodiment of the device for preventing coal dust from scouring the outside of the plasma generator of the present invention: a diverter plate is provided inside the right-angle pipe, and the diverter plate is located on the center line of the rotating tube;

[0015] When the pulverized coal air flow enters from the inlet, it passes through the rotating tube and contacts the surface of the diverter plate, and is equally diverted by the diverter plate.

[0016] As a preferred embodiment of the device for preventing coal dust from scouring the outside of the plasma generator of the present invention, a groove is provided at the lower end of the diverter plate, and the groove is provided corresponding to the one-way plate;

[0017] When the rotating tube rotates, the one-way plate rotates inside the slot.

[0018] As a preferred embodiment of the device for preventing coal dust scouring outside the plasma generator of the present invention: the one-way plate is arranged obliquely relative to the rotating tube, and the height of the one-way plate at the end away from the telescopic plate is lower;

[0019] When the air flow blows from bottom to top, the one-way plate can drive the rotating tube to rotate; when the air flow blows from back to front, the one-way plate can drive the rotating tube to rotate.

[0020] As a preferred embodiment of the device for preventing coal dust scouring outside the plasma generator of the present invention, the surface of the positioning plate is an inclined surface, and the telescopic plate contacts the surface of the positioning plate through a rotating ball.

[0021] The beneficial effects of the present invention are as follows: the plasma burner is wrapped by a fixed tube, and the outer periphery drives the coal powder to turn through the rotating rotating tube and the telescopic plate, thereby preventing the coal powder from directly scouring the surface of the fixed tube, and effectively reducing the surface damage caused by the scouring of the coal powder. At the same time, the one-way plate pushed by the coal powder air flow can further form a vortex, so that the coal powder can be concentrated in the middle position of the pipeline, accelerating the speed at which the coal powder enters the combustion chamber, and ensuring the stability of the flame in the combustion chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Among them:

[0023] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the cutaway structure of the present invention.

[0025] Figure 3 It is a schematic diagram of the internal structure of the present invention.

[0026] Figure 4 It is a structural schematic diagram of the fixing component in the present invention.

[0027] Figure 5 It is a structural schematic diagram of the telescopic plate in the present invention.

[0028] Figure 6 It is a schematic diagram of the cross-section structure of the rotating tube in the present invention.

[0029] Figure numerals: 1. elbow assembly; 11. right-angle pipe; 12. diverter plate; 13. flange; 14. outlet; 15. inlet; 16. opening; 17. positioning plate; 18. slot; 2. fixing assembly; 21. fixing pipe; 22. rotating pipe; 23. one-way plate; 24. telescopic plate; 25. connecting plate; 26. rotating groove; 27. rotating ball; 28. receiving groove; 29. rotating groove; 30. rotating block; 31. spring. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0031] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as the meanings of the terms and the overall description of the present invention.

[0032] Example 1, reference Figures 1 to 6 This embodiment provides a device for preventing coal dust from eroding the outside of a plasma generator, comprising:

[0033] The elbow assembly 1 includes a right-angle pipe 11, an opening 16 arranged on the surface of the right-angle pipe 11, and a positioning plate 17 arranged on the edge of the opening 16; and a fixed assembly 2, including a fixed pipe 21, a rotating pipe 22 arranged on the surface of the fixed pipe 21, a telescopic plate 24 arranged at one end of the rotating pipe 22, and a one-way plate 23 arranged on the surface of the rotating pipe 22; wherein when the coal powder air flow flows through the inside of the right-angle pipe 11, the gas drives the rotating pipe 22 to rotate through the one-way plate 23, and the telescopic plate 24 slides on the surface of the positioning plate 17; the exhaust port 14 of the elbow assembly 1 is connected to the combustion chamber, the inlet 15 is connected to the fuel pipeline, and the plasma burner is fixed on the surface of the fixed pipe 21. The surface of the connecting plate 25 is connected, and the ignition end of the plasma burner passes through the fixed tube 21 into the interior of the combustion chamber. The fuel pipeline introduces the coal powder air flow from the inlet 15 on the surface of the right-angle pipe 11. The coal powder air flow encounters the ignition end of the plasma burner and is ignited. The coal powder burns inside the combustion chamber. The fixed tube 21 is fixed to the surface of the right-angle pipe 11 to ensure that the plasma burner can be fixed and stable. The fixed tube 21 is arranged outside the plasma burner, which can effectively protect the plasma burner and prevent the plasma burner from direct contact with the coal powder. At the same time, the rotating tube 22 and the telescopic plate 24 reduce the impact of the coal powder on the surface through rotation, further increasing the service life of the anti-coal powder scouring device.

[0034] Usage process: The coal powder air flow enters from the inlet port 15 and flows upward along the right-angled pipe 11. Since the one-way plate 23 is tilted downward, although the air flow blows the one-way plates 23 on both sides of the rotating tube 22 at the same time, the contact area of the one-way plate 23 with the wind is larger on the downward side, the forces on both sides of the rotating tube 22 are different, so the rotating tube 22 rotates toward the side with smaller force. The rotation of the rotating tube 22 drives the telescopic plate 24 to rotate, and the telescopic plate 24 slides on the surface of the positioning plate 17. The plasma burner is installed on the surface of the connecting plate 25. The coal powder air flow enters through the inlet port 15 on the surface of the right-angled pipe 11 and contacts the rotating rotating tube 22 and the telescopic plate 24 surface. The rotating tube 22 and the telescopic plate 24 rotate when they are blown by the coal powder air flow, thereby changing from being directly impacted by the coal powder air flow to being pushed by the coal powder air flow, effectively reducing the wear of the coal powder air flow on components and extending the service life of the anti-coal powder scour device.

[0035] Example 2, reference Figures 1 to 6 , which is the second embodiment of the present invention, differs from the previous embodiment in that it further includes,

[0036] The surface of the fixed tube 21 is provided with a rotating groove 29, and the inner surface of the rotating tube 22 is fixed with a rotating block 30, which is rotatably connected to the rotating groove 29; the rotating groove 29 is provided on the surface of the fixed tube 21, and the rotating block 30 is provided on the surface of the rotating tube 22. The fixed tube 21 and the rotating tube 22 rotate relative to each other through the rotating groove 29 and the rotating block 30. At the same time, the rotating groove 29 and the rotating block 30 enable the rotating tube 22 to rotate stably at a position of the fixed tube 21, ensuring that the relative position of the rotating tube 22 and the fixed tube 21 does not change; the interior of the rotating tube 22 is provided with a receiving groove 28, and the rotating tube A spring 31 is provided inside 22, and the spring 31 is fixedly connected to the telescopic plate 24, and the telescopic plate 24 is slidably connected to the accommodating groove 28; the telescopic plate 24 is provided inside the accommodating groove 28 and can slide inside the accommodating groove 28. At the same time, since the spring 31 is provided inside the accommodating groove 28, the spring 31 will extrude the telescopic plate 24 outward, and the telescopic plate 24 is always squeezed on the surface of the positioning plate 17, thereby completely wrapping the fixed tube 21. At the same time, the fixed tube 21 is stably fixed on the surface of the right-angle pipe 11, ensuring that the plasma burner can be installed normally, thereby not affecting the normal use of the boiler.

[0037] The surface of the telescopic plate 24 is provided with a rotation groove 26, and the interior of the rotation groove 26 is connected to a rotation ball 27, and the rotation ball 27 contacts the surface of the positioning plate 17; the rotation groove 26 is a spherical groove, and the rotation ball 27 is arranged inside the rotation groove 26. When the rotation ball 27 is subjected to an external force, it rotates inside the rotation groove 26. At the same time, the portion of the rotation ball 27 exposed from the rotation groove 26 is less than half of the rotation ball 27, ensuring that the rotation ball 27 will not separate from the rotation groove 26 when it rotates. The rotation ball 27 slides on the surface of the positioning plate 17. Since the surface of the positioning plate 17 is an inclined surface, the rotation ball 27 will squeeze the telescopic plate 24 when it moves, so that the length of the telescopic plate 24 extending out of the rotation tube 22 changes, thereby effectively Wrap the fixed tube 21; an inlet 15 and an outlet 14 are respectively provided at both ends of the right-angle tube 11, and a flange 13 is provided on the edge of the outlet 14; a connecting plate 25 is fixed to one end of the fixed tube 21; the right-angle tube 11 is connected to the combustion chamber through the flange 13 to ensure the sealing effect, the inlet 15 is connected to the fuel pipeline, and the plasma burner is fixed on the surface of the connecting plate 25 on the surface of the fixed tube 21, then the ignition end of the plasma burner passes through the fixed tube 21 into the interior of the combustion chamber, and the fuel pipeline introduces the pulverized coal air flow from the inlet 15 on the surface of the right-angle tube 11, the pulverized coal air flow encounters the ignition end of the plasma burner and is ignited, and the pulverized coal burns inside the combustion chamber.

[0038] The one-way plate 23 is tilted relative to the rotating tube 22, and the height of the end of the one-way plate 23 away from the telescopic plate 24 is lower; when the airflow blows from bottom to top, the one-way plate 23 can drive the rotating tube 22 to rotate, and when the airflow blows from back to front, the one-way plate 23 can drive the rotating tube 22 to rotate; since the one-way plate 23 is tilted downward, although the airflow blows the one-way plates 23 on both sides of the rotating tube 22 at the same time, since the contact area of the one-way plate 23 with the wind is larger on the downward side, the forces on both sides of the rotating tube 22 are different, and the rotating tube 22 rotates toward the side with less force. At the same time, when the one-way plate 23 rotates, a certain degree of vortex can be generated, which changes the moving direction of the coal powder air flow, so that the coal powder air flow can move forward along the vortex center, so that the coal powder air flow can enter the combustion chamber as soon as possible, ensuring the stability of the combustion flame; the trapezoidal one-way plate 23 changes the flow direction of the coal powder air flow when it rotates, so that the coal powder air flow can The vortex formed between 22 and the combustion chamber accelerates the movement speed of the coal powder air flow and gathers the coal powder to the position in the middle of the pipe, speeding up the speed of the coal powder entering the combustion chamber and ensuring the continuous stability of the flame; the one-way plate 23 is arranged on the surface of the rotating tube 22, and the one-way plate 23 is arranged in a unidirectional tilted manner and is also tilted on the surface of the rotating tube 22, so that the air flow below and the air flow behind can both push the one-way plate 23 to rotate. Since it can be pushed by the coal powder air flow, the impact of the coal powder on the one-way plate 23 is relatively low, ensuring the stable rotation of the one-way plate 23. At the same time, due to the setting of the groove 18 on the surface of the diverter plate 12, the coal powder that rotates with the one-way plate 23 will be blocked by the diverter plate 12, and then attracted by the vortex generated by the rotation of the one-way plate 23, speeding up the movement speed of the coal powder air flow, gathering the coal powder to the position in the middle of the pipe, and entering the combustion chamber along the right-angle pipe, speeding up the speed of the coal powder entering the combustion chamber and ensuring the continuous stability of the flame.

[0039] The surface of the positioning plate 17 is an inclined surface, and the telescopic plate 24 contacts the surface of the positioning plate 17 through the rotating ball 27. The positioning plate 17 is arranged at the connection between the right-angle pipe 11 and the fixed pipe 21, which is the middle position of the right-angle bend of the right-angle pipe 11. The shape of the right-angle bend 11 at this time is changed by the positioning plate 17, so that the telescopic plate 24 can rotate along the relatively flat positioning plate 17 when rotating, so that the length of the telescopic plate 24 extending from the rotating tube 22 changes a little bit when the telescopic plate 24 rotates on the surface of the positioning plate 17, thereby avoiding a sudden large distance change in the length of the telescopic plate 24 extending from the rotating tube 22, which causes the telescopic plate 24 to be stuck.

[0040] Usage process: The plasma burner is installed on the surface of the connecting plate 25. The coal powder air flow enters through the inlet 15 on the surface of the right-angle pipe 11 and contacts the rotating rotating tube 22 and the surface of the telescopic plate 24. Since the one-way plate 23 is tilted downward, the air flow blows the one-way plates 23 on both sides of the rotating tube 22 at the same time. However, since the contact area of the one-way plate 23 with the wind is larger on the downward side, the forces on both sides of the rotating tube 22 are different. Therefore, the rotating tube 22 rotates toward the side with less force, and the rotation of the rotating tube 22 drives the telescopic plate 24 to rotate. The telescopic plate 24 slides inside the accommodating groove 28 on the surface of the rotating tube 22, and the spring 31 pushes the telescopic plate 24 outward, so that the rotating ball 27 on the surface of the telescopic plate 24 is squeezed on the surface of the positioning plate 17. When the rotating tube 22 rotates, the telescopic plate 24 is driven to rotate, and the rotating ball 27 on the surface of the telescopic plate 24 rolls inside the rotating groove 26, so that the telescopic plate 24 moves on the surface of the positioning plate 17. Since the surface of the positioning plate 17 is an inclined surface, the distance that the telescopic plate 24 extends out of the rotating tube 22 is constantly changing, thereby tightly wrapping the fixed tube 21.

[0041] Example 3, reference Figures 1 to 6 , which is the third embodiment of the present invention, is different from the previous embodiment in that it further includes:

[0042] The right-angled pipe 11 is provided with a diverter plate 12 inside, and the diverter plate 12 is located on the center line of the rotating pipe 22. When the coal-powdered air flow enters from the inlet 15, it contacts the surface of the rotating pipe 22 and the diverter plate 12, and is equally diverted by the diverter plate 12. The diverter plate 12 is located in the middle of the right-angled pipe 11 and the rotating pipe 22, dividing the right-angled pipe 11 and the rotating pipe 22 into two halves, so that the coal-powdered air flow enters from the inlet 15, moves upward along the rotating pipe 22 and the diverter plate 12, and is diverted. The pulverized coal air is blocked by the plate 12, and thus enters the combustion chamber along the diverter plate 12, avoiding the formation of turbulence at the upper end of the rotating tube 22 and reducing the moving speed of the pulverized coal air flow; a groove 18 is provided at the lower end of the diverter plate 12, and the groove 18 is corresponding to the one-way plate 23; when the rotating tube 22 rotates, the one-way plate 23 rotates inside the groove 18; when the rotating tube 22 rotates, the one-way plate 23 on the surface rotates inside the groove 18, reducing the distance between the rotating tube 22 and the diverter plate 12, and ensuring the stability of the flow path of the pulverized coal air flow.

[0043] Usage process: When the pulverized coal air flow drives the rotating tube 22 to rotate, a part of the pulverized coal air flow enters the combustion chamber along the right-angle pipe 11, and a part of the pulverized coal air flow moves upward along the rotating tube 22. The pulverized coal air flow contacts the surface of the diverter plate 12 and is evenly diverted by the diverter plate 12. The pulverized coal air flow enters the combustion chamber along the diverter plate 12. When the rotating tube 22 rotates, the one-way plate 23 on the surface rotates inside the notch 18, reducing the distance between the rotating tube 22 and the diverter plate 12, thereby ensuring the stability of the flow channel of the pulverized coal air flow.

[0044] Working principle: The plasma burner is installed on the surface of the connecting plate 25, and the pulverized coal air flow enters through the inlet 15 on the surface of the right-angled pipe 11, and contacts the rotating rotating tube 22 and the telescopic plate 24 surface. Since the one-way plate 23 is tilted downward, although the airflow blows the one-way plates 23 on both sides of the rotating tube 22 at the same time, the contact area of the one-way plate 23 with the wind on the downward side is larger, the forces on both sides of the rotating tube 22 are different, so the rotating tube 22 rotates toward the side with less force, and part of the pulverized coal air flow enters the combustion chamber along the right-angled pipe 11, and part of the pulverized coal air flow moves upward along the rotating tube 22, and the pulverized coal air flow contacts the surface of the diverter plate 12 and is evenly diverted by the diverter plate 12. The pulverized coal air flow enters the combustion chamber along the diverter plate 12. When the rotating tube 22 rotates, the one-way plate 23 on the surface rotates inside the notch 18, reducing the distance between the rotating tube 22 and the diverter plate 12. The spring 31 pushes the telescopic plate 24 outward, and the rotating ball 27 on the surface of the telescopic plate 24 is squeezed against the surface of the positioning plate 17. When the rotating tube 22 rotates, it drives the telescopic plate 24 to rotate, and the rotating ball 27 on the surface of the telescopic plate 24 rolls inside the rotating groove 26, so that the telescopic plate 24 moves on the surface of the positioning plate 17. Since the surface of the positioning plate 17 is an inclined surface, the distance that the telescopic plate 24 extends out of the rotating tube 22 is constantly changing, thereby tightly wrapping the fixed tube 21. The end of the one-way plate 23 away from the telescopic plate 24 is lower, so the one-way plate 23 forms a vortex when rotating, which accelerates the movement speed of the pulverized coal air flow and gathers the pulverized coal to the middle position of the pipeline, thereby accelerating the speed of the pulverized coal entering the combustion chamber and ensuring the continuous stability of the flame.

[0045] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A device for preventing coal dust from scouring the outside of a plasma generator, characterized in that: include, An elbow assembly (1) comprises a right-angle pipe (11), an opening (16) arranged on the surface of the right-angle pipe (11), and a positioning plate (17) arranged at the edge of the opening (16); and The fixing assembly (2) comprises a fixing tube (21), a rotating tube (22) arranged on the surface of the fixing tube (21), a telescopic plate (24) arranged at one end of the rotating tube (22), and a one-way plate (23) arranged on the surface of the rotating tube (22); wherein, When the coal powder air flow flows through the inside of the right-angle pipe (11), the gas drives the rotating tube (22) to rotate through the one-way plate (23), and the telescopic plate (24) slides on the surface of the positioning plate (17).

2. The device for preventing coal dust from scouring the outside of a plasma generator according to claim 1, characterized in that: A rotating groove (29) is provided on the surface of the fixed tube (21), and a rotating block (30) is fixed on the inner surface of the rotating tube (22), and the rotating block (30) is rotatably connected to the rotating groove (29).

3. The device for preventing coal dust from scouring the outside of a plasma generator according to claim 2, characterized in that: The rotating tube (22) is provided with a receiving groove (28) inside, and a spring (31) is provided inside the rotating tube (22). The spring (31) is fixedly connected to the telescopic plate (24), and the telescopic plate (24) is slidably connected to the receiving groove (28).

4. The device for preventing coal dust from scouring the outside of a plasma generator according to claim 3, characterized in that: The surface of the telescopic plate (24) is provided with a rotation groove (26), the interior of the rotation groove (26) is rotatably connected to a rotation ball (27), and the rotation ball (27) is in contact with the surface of the positioning plate (17).

5. The device for preventing coal dust from scouring the outside of a plasma generator according to claim 4, characterized in that: An inlet (15) and an outlet (14) are respectively provided at both ends of the right-angle pipe (11), and a flange (13) is provided at the edge of the outlet (14).

6. The device for preventing coal dust from scouring the outside of a plasma generator according to claim 5, characterized in that: A connecting plate (25) is fixed to one end of the fixed tube (21).

7. The device for preventing coal dust from scouring the outside of a plasma generator according to claim 6, characterized in that: A diverter plate (12) is provided inside the right-angle pipe (11), and the diverter plate (12) is located on the center line of the rotating tube (22); When the coal powder air flow enters from the inlet (15), it contacts the surface of the diverter plate (12) through the rotating rotating tube (22) and is equally diverted by the diverter plate (12).

8. The device for preventing coal dust from scouring the outside of a plasma generator according to claim 7, characterized in that: The lower end of the diverter plate (12) is provided with a notch (18), and the notch (18) is provided corresponding to the one-way plate (23); When the rotating tube (22) rotates, the one-way plate (23) rotates inside the notch (18).

9. The device for preventing coal dust from scouring the outside of a plasma generator according to claim 8, characterized in that: The one-way plate (23) is arranged obliquely relative to the rotating tube (22), and the height of the one-way plate (23) at one end away from the telescopic plate (24) is lower; When the air flow blows from bottom to top, the one-way plate (23) can drive the rotating tube (22) to rotate; when the air flow blows from back to front, the one-way plate (23) can drive the rotating tube (22) to rotate.

10. The device for preventing coal dust from scouring the outside of a plasma generator according to claim 9, characterized in that: The surface of the positioning plate (17) is an inclined surface, and the telescopic plate (24) contacts the surface of the positioning plate (17) through the rotating ball (27).

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