Plasma generator protection device

Abstract

A plasma generator protection device is provided. The plasma generator (1) has a mounting base (11) and a spray gun (12) extending into the combustion chamber. A sleeve (2) is fitted to the outside of the spray gun and serves to withstand the flushing of the primary air flow of pulverized coal in the combustion chamber instead of the spray gun. A powder slag cleaning unit including a scraper is attached to the sleeve, with the length of the scraper aligned with the length of the spray gun. The scraper is driven by an annular drive mechanism and rotates along a circumferential path on the outer surface of the sleeve. Its movement path is closely attached to the outer circumferential surface of the sleeve, and its rotation axis overlaps the geometric axis of the sleeve, so that it can clean the powder slag that has adhered to the sleeve at high temperatures. The sleeve blocks the brushing of the pulverized coal flow, and the annular drive scraper cleans the powder slag, thereby ensuring the heat dissipation performance of the spray gun, significantly extending the service life of the spray gun, reducing maintenance costs, and improving the operational stability and economy of the device.

Description

[Technical Field]

[0001] The present invention relates to the technical field of plasma generator protection, and in particular to a plasma generator protection device. [Background technology]

[0002] The main role of the plasma generator used in boiler burners is to deliver high-temperature plasma to the burner to achieve efficient ignition and stable combustion of pulverized coal. By generating high-temperature plasma (temperature above 5000K), a localized high-temperature region is formed, and pulverized coal particles rapidly release volatiles as they pass through the plasma "core," becoming ignited. This significantly increases the combustion rate of the pulverized coal and reduces the energy required for ignition.

[0003] Because the spray gun of the plasma generator is located inside the combustion chamber, it is subject to strong impacts from the flow of pulverized coal in the primary air, which can easily cause excessive abrasion and damage. Furthermore, the spray gun has a high temperature, and when the pulverized coal comes into contact with it, it melts at high temperatures and turns into powdered slag, which is adsorbed to the outside of the spray gun, affecting heat dissipation and causing problems such as a deterioration in the performance of the spray gun material and deformation. Summary of the Invention

[0004] In view of the problems existing in the conventional plasma generator protection device described above, the present invention is proposed.

[0005] The above technical problems are solved by the following technical solutions. a plasma generator having a mounting base and a spray gun extending to a combustion chamber; a sleeve fitted to the exterior of the spray gun to withstand the flashing of the primary air flow of pulverized coal in the combustion chamber instead of the spray gun; a powdery slag cleaning unit including a scraper, the length direction of the scraper being aligned with the length direction of the spray gun, and the scraper being attached to the outer periphery of the sleeve; The proposed plasma generator protection device is such that the scraper is driven by an annular drive mechanism and rotates along a circumferential path on the outer surface of the sleeve, with its movement path closely aligned with the outer circumferential surface of the sleeve and its rotation axis overlapping with the geometric axis of the sleeve so as to clean powdery slag that has adhered to the sleeve surface at high temperatures.

[0006] In a preferred embodiment of the plasma generator protection device described in the present invention, the sleeve and the spray gun are assembled via a screw thread, and a heat-conducting medium is applied between the sleeve and the spray gun.

[0007] In a preferred embodiment of the plasma generator protection device of the present invention, the sleeve is a wear-resistant ceramic pipe, and the outer surface of the wear-resistant ceramic pipe is mechanically polished to form nano-scale roughness.

[0008] In a preferred embodiment of the plasma generator protection device according to the present invention, the annular drive mechanism includes a bidirectional ring gear and an outer ring gear fitted to the outside of the sleeve and fixed to the mounting base, the bidirectional ring gear is fitted to the outside of the outer ring gear, and the bidirectional ring gear and the outer ring gear are coaxial; An interlocking gear is meshed between the bidirectional ring gear and the outer ring gear, and the bidirectional ring gear is driven to rotate by the transmission gear. The bidirectional ring gear rotates around its own axis under the driving of the transmission gear, driving the interlocking gear to perform a circumferential rolling motion along the tooth profile of the outer ring gear.

[0009] In a preferred embodiment of the plasma generator protection device of the present invention, an interlocking rod is rotatably connected to the axis of the interlocking gear, and the length direction of the interlocking rod is the same as the length direction of the scraper; The interlocking rod and the scraper are fixedly connected via a connecting rod, and the interlocking rod is driven by an interlocking gear to enable the scraper to move in a circular motion in close contact with the sleeve.

[0010] In a preferred embodiment of the plasma generator protection device according to the present invention, the end of the link rod remote from the link gear is provided with a guide support assembly for stabilizing the link rod when it makes a circular movement along with the link gear.

[0011] In a preferred embodiment of the plasma generator protection device according to the present invention, the side of the scraper that is bonded to the sleeve has an arc-shaped structure.

[0012] In a preferred embodiment of the plasma generator protection device of the present invention, the device further includes a sliding support, which is mounted on the exterior of the combustion chamber and drives the plasma generator to perform linear reciprocating motion, thereby preventing damage caused by collision during installation and removal.

[0013] In a preferred embodiment of the plasma generator protection device described in the present invention, the sliding support includes a mounting plate, a support base is provided on one side of the mounting plate, the sliding base is slidably mounted on the support base, and is connected to the bottom of the plasma generator via a support rod.

[0014] In a preferred embodiment of the plasma generator protection device according to the present invention, a drive assembly is provided inside the support base for driving the slide base to perform linear reciprocating displacement.

[0015] The beneficial effects of this invention are as follows: the sleeve effectively blocks the brushing of the pulverized coal flow, and the annular drive scraper is combined to clean the powder slag, ensuring the heat dissipation performance of the spray gun, significantly extending the service life of the spray gun, reducing maintenance costs, and improving the operating stability and economy of the device. [Brief explanation of the drawings]

[0016] In order to explain the technical solutions in the embodiments of the present invention more clearly, the drawings of the embodiments of the present invention are briefly described below. The drawings described below only relate to some of the embodiments of the present invention and are not intended to limit the present invention.

[0017] [Figure 1] A three-dimensional structural diagram of a plasma generator protection device is shown. [Figure 2] A structural diagram of the powder slag cleaning section of the plasma generator protection device is shown. [Figure 3] An enlarged structural diagram of part A in Figure 2 is shown. [Figure 4] 1 shows a structural diagram of a sliding support part in a plasma generator protection device. [Figure 5] 1 shows a structural diagram of a drive assembly in a plasma generator protection device. DETAILED DESCRIPTION OF THE INVENTION

[0018] In order to enable those skilled in the art to understand the present invention better, the present invention will be described in more detail below in conjunction with specific embodiments and drawings.

[0019] The terms used in this invention are general terms widely used in the field up to now in consideration of the function of this invention, but these terms may change according to the intention of a person skilled in the art, precedent, or new technology in this field. In addition, specific terms are selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of this invention. Therefore, the terms used in the specification are based on the meaning of the terms and the overall description of this invention, and should not be understood as simple names.

[0020] Referring to FIGS. 1 to 3, this embodiment a plasma generator 1 having a mounting base 11 and a spray gun 12 extending to a combustion chamber; a sleeve 2 fitted to the outside of the spray gun 12 and adapted to withstand the flashing of the primary air flow of pulverized coal in the combustion chamber in place of the spray gun 12; a powdery slag cleaning unit (3) including a scraper (31), the length direction of the scraper (31) coincides with the length direction of the spray gun (12), the side of the scraper (31) attached to the sleeve (2) has an arc-shaped structure, and the scraper (31) is attached to the outer periphery of the sleeve (2); The scraper 31 is driven by an annular drive mechanism 32 and rotates along a circumferential path on the outer surface of the sleeve 2, with its movement path closely aligned with the outer circumferential surface of the sleeve 2 and its rotation axis overlapping with the geometric axis of the sleeve 2 so as to clean powdery slag that has adhered to the surface of the sleeve 2 at high temperatures.

[0021] Cleaning the powdery slag solves the problem of the adhesion of powdery slag to the surface of the sleeve 2 affecting heat dissipation, preventing the heat from the spray gun 12 from being released in a timely manner and preventing the performance of the material from being reduced or damaged due to excessively high temperatures, thereby reducing maintenance costs.

[0022] The sleeve 2 and the spray gun 12 are assembled via a screw thread, and a heat-conducting medium is applied between the sleeve 2 and the spray gun 12 .

[0023] Specifically, pipe threads are welded to both ends of the exterior of the spray gun 12, and a female thread that matches the pipe thread is provided on the inside of the sleeve 2, and the assembly of the sleeve 2 is achieved by the pipe thread and the female thread. Here, the thickness of the heat transfer medium matches the thickness of the pipe thread, ensuring that there is no gap between the sleeve 2 and the spray gun 12 after assembly and ensuring overall heat transfer performance.

[0024] In addition, the sleeve 2 has the effect of blocking the impact of the primary air flow of pulverized coal, avoiding the problem of damage caused by direct action on the spray gun 12, effectively extending the service life and reducing unnecessary costs.

[0025] The annular drive mechanism 32 includes a bidirectional ring gear 321 and an outer ring gear 322 fitted to the outside of the sleeve 2 and fixed to the mounting base 11, the bidirectional ring gear 321 is fitted to the outside of the outer ring gear 322, and the bidirectional ring gear 321 and the outer ring gear 322 are coaxial; The interlocking gear 323 is meshed between the bidirectional ring gear 321 and the outer ring gear 322, and the bidirectional ring gear 321 is driven to rotate by the transmission gear 324. The bidirectional ring gear 321 rotates around its own axis under the driving of the transmission gear 324, driving the interlocking gear 323 to perform a circumferential rolling motion along the tooth profile of the outer ring gear 322. During power transmission, the center of gravity of the interlocking gear 323 moves circumferentially along a circular locus determined by the tooth profile of the outer ring gear 322, and the meshing points with the bidirectional ring gear 321 and the outer ring gear 322 describe rolling loci along the tooth profiles of the bidirectional ring gear 321 and the outer ring gear 322, respectively, but the outer ring gear 322 is held in a fixed state so as not to move.

[0026] Specifically, the transmission gear 324 is driven by a motor attached to the outside of the mounting base 11 and meshes with the teeth of the outer ring of the bidirectional ring gear 321, driving the bidirectional ring gear 321 to rotate. A counter gear meshes with the outside of the bidirectional ring gear 321, and the counter gear and the transmission gear 324 are disposed opposite each other. The counter gear also meshes with the teeth of the outer ring of the bidirectional ring gear 321, assisting its rotation and ensuring the rotational stability of the bidirectional ring gear 321.

[0027] An interlocking rod 325 is rotatably connected to the axis of the interlocking gear 323, and the length direction of the interlocking rod 325 is the same as the length direction of the scraper 31. The interlocking rod 325 and the scraper 31 are fixedly connected via a connecting rod, and the interlocking rod 325, when driven by the interlocking gear 323, allows the scraper 31 to move in a circular motion in close contact with the sleeve 2.

[0028] At the end of link rod 325 remote from link gear 323 is a guide support assembly 326 for stabilizing link rod 325 as it moves circumferentially with link gear 323 .

[0029] Specifically, the guide support assembly 326 includes a fixed ring 3261, one side of which is formed with an annular guide groove 3262. Rollers 3263 roll within the annular guide groove 3262, the axes of which are rotatably connected to the interlocking rod 325. When the interlocking gear 323 performs a circular rolling motion along the tooth profile of the outer ring gear 322, it is rotatably connected to the interlocking rod 325 and therefore only rotates circularly without rotating on its own axis. As the interlocking rod 325 rotates, the connecting rod drives the scraper 31 to closely contact the sleeve 2 and perform a circular motion, removing any powdery slag adsorbed on the surface of the sleeve 2. This ensures a heat dissipation environment for the spray gun 12 and prevents damage to the spray gun 12 due to overheating caused by the adsorption of powdery slag.

[0030] As an alternative example: Referring to Figures 4 and 5, in one embodiment provided by the present application, the plasma generator protection device further includes a sliding support part 4, which is attached to the outside of the combustion chamber and drives the plasma generator 1 to perform a linear reciprocating motion, and is used to avoid damage due to collision during attachment and detachment.

[0031] The sliding support part 4 includes a mounting plate 41, a support base 42 is provided on one side of the mounting plate 41, a sliding base 43 is slidably provided on the support base 42, and the sliding base 43 is connected to the bottom of the plasma generator 1 via a support rod 44.

[0032] Specifically, a slide groove is formed on the surface of the support base 42, and the slide base 43 slides in the slide groove. A drive assembly 45 is provided within the support base 42 for driving the slide base 43 to perform linear reciprocating displacement.

[0033] Specifically, a hollow cavity is formed inside the support base 42, and the drive assembly 45 is mounted in the hollow cavity. The drive assembly 45 includes a threaded sleeve 451, into which a screw 452 is threadably connected. The screw 452 is rotatably connected within the hollow cavity. The screw 452 is rotated by a rotary handle 453 mounted on the outside of the support base 42. Rotating the rotary handle 453 drives the screw 452 to rotate. As the screw 452 rotates, the threaded sleeve 451 is driven to perform a linear displacement movement along the thread rotation direction of the screw 452. The threaded sleeve 451 is connected to the slide base 43, so that the linear displacement drives the plasma generator 1 to perform a linear displacement synchronously with the linear displacement, thereby assisting in installation and removal. This prevents the risk of collision damage due to vibration during installation and removal, improving the convenience and safety of installation and removal.

[0034] As an alternative example: In one embodiment provided by the present application, the sleeve 2 is made of a wear-resistant ceramic pipe, Specifically, the wear-resistant ceramic pipe is made of the following materials in weight percent:

[0035] Aluminum oxide: 85%-90%, zirconium oxide: 5%-8%, nanoscale silicon carbide: 3%-5%, yttrium oxide: 1%-2%, boron nitride fine powder: 1%-3%, carbon fiber or ceramic fiber: 2%-5%; The manufacturing process is as follows:

[0036] Mud preparation: Aluminum oxide, zirconium oxide, nano-scale silicon carbide, yttrium oxide, boron nitride fine powder and carbon fiber are mixed, and an appropriate amount of clay and mineralizer are added. Then, the mixture is subjected to ball milling to ensure that the components are uniformly distributed. It is sieved multiple times, iron removed, pressed into a muddy state and then stale treated.

[0037] Molding: An inner and outer diameter profile grinding machine is used for forming, ensuring the dimensional accuracy and surface mass of the sleeve 2.

[0038] Drying: After drying naturally in the shade, the fabric is placed in a drying chamber for further drying.

[0039] Sintering: The sleeve 2 is obtained by adopting a hot isostatic pressing (HIP) sintering technique, with a sintering temperature of 1600°C to 1700°C, a pressure of 100 MPa to 200 MPa, and a sintering time of 2 hours to 4 hours.

[0040] The exterior of the wear-resistant ceramic pipe is mechanically polished to form nanoscale roughness on the surface.

[0041] The sleeve 2 has high corrosion resistance and impact resistance, and can better protect the spray gun 12 in the harsh environment inside the combustion chamber.

[0042] Finally, it should be pointed out that the methods and devices described in detail above are merely examples, and that those skilled in the art can modify these examples in different ways without departing from the scope of the invention.

Claims

1. a plasma generator (1) having a mounting base (11) and a spray gun (12) extending to a combustion chamber; a sleeve (2) fitted to the outside of the spray gun (12) to withstand the flashing of the primary air flow of pulverized coal in the combustion chamber instead of the spray gun (12); a powdery slag cleaning unit (3) including a scraper (31), the length direction of which coincides with the length direction of the spray gun (12), and the scraper (31) is attached to the outer periphery of the sleeve (2); The scraper (31) is driven by an annular drive mechanism (32) and rotates along a circumferential path on the outer surface of the sleeve (2), the path of the scraper being closely aligned with the outer circumferential surface of the sleeve (2) and the rotation axis of the scraper overlaps with the geometric axis of the sleeve (2) so as to clean powdery slag deposited on the surface of the sleeve (2) at high temperatures.

2. 2. The plasma generator protection device according to claim 1, wherein the sleeve (2) and the spray gun (12) are assembled via a screw thread, and a heat-conducting medium is applied between the sleeve (2) and the spray gun (12).

3. 3. The plasma generator protection device according to claim 2, wherein the sleeve (2) is a wear-resistant ceramic pipe, and the outer surface of the wear-resistant ceramic pipe is mechanically polished to form nano-scale roughness on the surface.

4. The annular drive mechanism (32) includes a bidirectional ring gear (321) and an outer ring gear (322) fitted to the outside of the sleeve (2) and fixed to the mounting base (11), the bidirectional ring gear (321) is fitted to the outside of the outer ring gear (322), and the bidirectional ring gear (321) and the outer ring gear (322) are coaxial; 4. The plasma generator protection device according to claim 3, wherein an interlocking gear (323) is engaged between the bidirectional ring gear (321) and the outer ring gear (322), the bidirectional ring gear (321) is driven to rotate by a transmission gear (324), the bidirectional ring gear (321) rotates around its own axis under the driving of the transmission gear (324), and drives the interlocking gear (323) to perform a circumferential rolling motion along the tooth profile of the outer ring gear (322).

5. An interlocking rod (325) is rotatably connected to the axis of the interlocking gear (323), and the length direction of the interlocking rod (325) is the same as the length direction of the scraper (31); 5. The plasma generator protection device according to claim 4, wherein the interlocking rod (325) and the scraper (31) are fixedly connected via a connecting rod, and the interlocking rod (325) is driven by the interlocking gear (323) to enable the scraper (31) to perform circular motion in close contact with the sleeve (2).

6. 6. The plasma generator protection device according to claim 5, wherein a guide support assembly (326) is provided at an end of the linking rod (325) remote from the linking gear (323) to provide stabilization when the linking rod (325) makes a circular movement together with the linking gear (323).

7. 7. The plasma generator protection device according to claim 6, wherein the scraper (31) has an arc-shaped structure on the side thereof attached to the sleeve (2).

8. 2. The plasma generator protection device according to claim 1, further comprising a sliding support (4), the sliding support (4) being attached to the outside of the combustion chamber, driving the plasma generator (1) to perform a linear reciprocating motion, and being used to avoid damage due to collision during attachment and detachment.

9. 9. The plasma generator protection device according to claim 8, wherein the sliding support (4) includes a mounting plate (41), a support base (42) is provided on one side of the mounting plate (41), and a sliding base (43) is slidably provided on the support base (42) and is connected to the bottom of the plasma generator (1) via a support rod (44).

10. 10. The plasma generator protection device according to claim 9, wherein a drive assembly (45) is provided inside the support base (42) for driving the slide base (43) to perform linear reciprocating displacement.

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