A self-adjusting elastic boiler air preheater sealing device

Abstract

The present invention relates to the technical field of rotary air preheater sealing devices, and particularly relates to a self-adjusting elastic boiler air preheater sealing device, which includes a support assembly, a self-rotating sealing assembly, and an elastic assembly. The support assembly is fixedly arranged on one side of the radial partition plate of the air preheater. The self-rotating sealing assembly includes a self-rotating member and a sealing assembly arranged on the self-rotating member. The self-rotating member is rotatably arranged on the support assembly through a limiting assembly. One end of the limiting assembly passes through the self-rotating member and is fixed inside the support assembly. The sealing assembly is used to contact the sector sealing plate of the air preheater. The lower end of the elastic assembly is fixedly arranged on a support plate fixedly connected to the radial partition plate. The upper end of the elastic assembly is provided with a pressing plate, and one end of the pressing plate is fixedly connected to one side of the self-rotating member. The present invention uses elasticity to achieve good sealing between the self-rotating sealing assembly and the sector plate of the air preheater, effectively reducing the air leakage rate of the rotary air preheater, reducing the operating power consumption, and improving the boiler thermal efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary air preheater sealing devices, and particularly relates to a self-adjusting elastic boiler air preheater sealing device. Background Art

[0002] The sealing technologies for the rotary air preheaters of thermal power generation boilers are emerging in an endless stream. The main purpose is to reduce the air leakage rate of the air preheater: one is to reduce the leakage contact between the internal heat exchange medium of the air preheater and the atmosphere outside the machine body, and the other is to reduce the cross-flow between the internal heat exchange gases. At present, the main sealing methods for the rotary air preheaters of thermal power generation boilers are hard contact mechanical seals, brush seals, hinge spring flexible seals, etc. Among them, the mechanical seals are severely worn and have a short service life, and need to be replaced frequently; the brush seals have a short service life, the steel wires are prone to deformation and are damaged quickly; the hinge spring flexible seals occupy a large area of the rotor, affecting the heat exchange efficiency, and the hinges are easily damaged and the spring life is limited. The same is true for other similar reed-type flexible seals derived from hinge spring flexible seals. Summary of the Invention

[0003] The purpose of the present invention is to address the above problems and provide a self-adjusting elastic boiler air preheater sealing device. This sealing device uses elasticity to achieve good sealing between the self-rotating sealing component and the sector plate of the air preheater, avoiding the direct hard contact mechanical seal between the sealing plate and the sector plate of the air preheater, effectively reducing the air leakage rate of the rotary air preheater, reducing the operating power consumption, and improving the boiler thermal efficiency.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A self-adjusting elastic boiler air preheater sealing device is applied to a boiler air preheater. The boiler air preheater has a radial partition. The sealing device includes a support component fixedly arranged on one side of the radial partition.

[0006] A self-rotating sealing component, which includes a self-rotating member and a sealing component fixedly arranged on the self-rotating member. The self-rotating member is rotatably arranged on the support component through a limiting component. One end of the limiting component passes through the self-rotating member and is fixed inside the support component. The gap between the self-rotating member and the support component can be adjusted through the limiting component. The sealing component is used to contact the sector sealing plate of the air preheater. The sealing component includes a vertical sealing plate and an inclined sealing gasket arranged on the vertical sealing plate. One end of the vertical sealing plate away from the inclined sealing gasket is fixedly arranged on the self-rotating member, and the inclined sealing gasket can be used to contact the sector sealing plate of the air preheater.

[0007] Elastic component, the elastic component is fixedly arranged on the side of the support component away from the radial partition board. One end of the elastic component is fixedly arranged on a support plate, one end of the support plate is fixedly connected with the radial partition board, the other end of the elastic component is provided with a pressing plate passing through it, and one end of the pressing plate is fixedly connected with one side of the self-rotating part. A strip-shaped hole is opened on the self-rotating part. The limiting component includes a limiting screw and a first limiting nut. The self-rotating part is connected with the cylinder through the limiting screw passing through the strip-shaped hole. The first limiting nut is rotatably arranged at the end of the limiting screw exposed from the self-rotating part. By rotating the first limiting nut, the gap size between the self-rotating part and the cylinder can be adjusted. A limiting part is also arranged above the pressing plate on the elastic component. The elastic component includes a vertical rod and a spring sleeved on the vertical rod. One end of the vertical rod is fixedly arranged on the support plate. One end of the spring contacts the support plate. The pressing plate passes through the vertical rod and contacts the end of the spring away from the support plate, so that the pressing plate can compress the spring. The limiting part is arranged at the end of the vertical rod away from the support plate and above the pressing plate.

[0008] A groove is also opened on the cylinder below the strip-shaped hole. The length of the groove is less than the length of the strip-shaped hole. A scraping plate that can extend into the groove is also arranged on the bottom end of the self-rotating part on the side of the strip-shaped hole away from the limit pin.

[0009] Further, the support component includes a vertical plate, an inclined plate and a cylinder. The vertical plate is fixedly connected with one side of the radial partition board through a fixing bolt. The inclined plate inclines towards the elastic component side. One end of the inclined plate is fixedly connected with the upper end of the vertical plate. The other end of the inclined plate is fixedly connected with the cylinder. The self-rotating part is rotatably arranged on the cylinder.

[0010] Further, the material of the inclined sealing gasket is carbon steel or molybdenum disulfide alloy material.

[0011] Further, the vertical rod is a screw rod, and the limiting part is a second limiting nut.

[0012] Further, the self-rotating part is a semi-circular plate part.

[0013] Further, the length of the vertical sealing plate is the same as the length of the self-rotating part.

[0014] Due to adopting the above technical scheme, the present invention has the following beneficial effects:

[0015] In the present invention, by providing a self-rotating sealing assembly on the support assembly and an elastic assembly connected to the self-rotating sealing assembly through a pressing plate, after the self-rotating sealing assembly contacts the sector plate of the rotary air preheater, it is subjected to frictional force and pressure. The frictional force and pressure cause the self-rotating sealing assembly to start rotating, and the pressing plate presses down, thereby causing the elastic assembly to be pressed down. After the rotary air preheater operates away from the sector sealing plate, the elastic assembly resets, and the self-rotating sealing assembly rotates counterclockwise to recover, finally completing one sealing cycle. Therefore, through the coordinated use of the support assembly, the self-rotating sealing assembly, and the elastic assembly, the present invention makes good use of elasticity to seal the self-rotating sealing assembly with the sector plate of the air preheater, avoiding direct hard contact mechanical sealing between the sealing plate and the sector plate of the air preheater, effectively reducing the air leakage rate of the rotary air preheater, reducing the operating power consumption, improving the boiler thermal efficiency, thereby reducing coal consumption, saving costs, improving the reliability and service life of the rotary air preheater, and at the same time reducing the carbon emissions of the power plant to a certain extent, providing some ideas for technical improvement for carbon peak and carbon neutrality, and making a certain contribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is a schematic structural diagram of a self-adjusting elastic boiler air preheater sealing device according to an embodiment of the present invention;

[0017] Figure 2 FIG. is a front sectional view of the self-rotating sealing assembly in a self-adjusting elastic boiler air preheater sealing device of the present invention;

[0018] Figure 3 FIG. is a top view of the self-rotating sealing assembly in a self-adjusting elastic boiler air preheater sealing device of the present invention;

[0019] Figure 4 FIG. is a front view of the cylinder in a self-adjusting elastic boiler air preheater sealing device of the present invention;

[0020] Figure 5 FIG. is a top view of the cylinder in a self-adjusting elastic boiler air preheater sealing device of the present invention.

[0021] The reference numerals in the figures are: 1 - radial partition, 2 - support plate, 3 - support assembly, 31 - vertical plate, 32 - inclined plate, 33 - cylinder, 331 - groove, 4 - self-rotating sealing assembly, 41 - self-rotating member, 411 - strip hole, 412 - limit screw, 413 - first limit nut, 42 - vertical sealing plate, 43 - inclined sealing gasket, 44 - scraper, 5 - elastic assembly, 51 - vertical rod, 52 - spring, 6 - pressing plate, 7 - limiting member, 8 - fixing bolt. DETAILED DESCRIPTION OF THE INVENTION

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0024] Embodiment

[0025] Please refer to Figures 1 to 5 , a self-adjusting elastic boiler air preheater sealing device, which is applied to a boiler air preheater. The boiler air preheater has a radial partition 1. The sealing device includes a support assembly 3, a self-rotating sealing assembly 4 and an elastic assembly 5.

[0026] The support assembly 3 is fixedly arranged on one side of the radial partition 1 according to the rotation direction of the rotary air preheater. For example, when the air preheater rotates from right to left, the support assembly 3 is fixedly arranged on the right side of the radial partition 1. The self-rotating sealing assembly 4 includes a self-rotating member 41 and a sealing assembly arranged on the self-rotating member 41. The self-rotating member 41 is rotatably arranged on the support assembly 3 through a limiting assembly. One end of the limiting assembly passes through the self-rotating member 41 and is fixed inside the support assembly 3. The gap between the self-rotating member 41 and the support assembly 3 can be adjusted through the limiting assembly. In combination with the actual situation, considering that the radial partition 1 of the air preheater will expand and deform due to heat, a limiting assembly is provided to adjust the gap between the self-rotating member 41 and the support assembly 3, so that the distance between the self-rotating sealing assembly 4 and the sector plate of the air preheater is adjustable, preventing the self-rotating sealing assembly 4 from being in interference contact with the sector plate of the air preheater after the radial partition 1 expands and deforms due to heat, resulting in easy damage to the sector plate of the air preheater and the sealing assembly, and problems such as rotation jamming, abnormal noise, and increased operating current of the air preheater.

[0027] The sealing assembly is used to contact with the sector sealing plate of the air preheater. The elastic component 5 is fixedly arranged on the side of the support component 3 away from the radial partition plate 1. One end of the elastic component 5 is fixedly arranged on a support plate 2, one end of the support plate 2 is fixedly connected with the side of the radial partition plate 1 close to the bottom, the other end of the elastic component 5 is provided with a pressing plate 6 in a penetrating manner, and one end of the pressing plate 6 is fixedly connected with one side of the self-rotating member 41; a limiting member 7 is further arranged above the upper end of the elastic component 5 and above the pressing plate 6.

[0028] As a further specific technical solution, the support component 3 includes a vertical plate 31, an inclined plate 32 and a cylinder 33. The vertical plate 31 is fixedly connected with one side of the radial partition plate 1 through a fixing bolt 8. The inclined plate 32 inclines towards the elastic component 5. One end of the inclined plate 32 is fixedly connected with the upper end of the vertical plate 31, and the cylinder 33 is fixedly arranged at the other end of the inclined plate 32. Specifically, the cylinder 33 is a solid cylinder. The self-rotating member 41 is rotatably arranged on the cylinder 33. This support component is used to support the self-rotating sealing assembly 4 and connect the rotary sealing assembly 4 with the elastic component 5 through the connected pressing plate 6, playing a role of support and transition. And the setting of the inclined plate 32 enables the self-rotating member 41 to obtain a larger rotation angle. Correspondingly, the self-rotating member 41 adopted in this embodiment is a semi-circular plate member, so that the self-rotating member 41 can better support and be fixed on the cylinder 33 and rotate smoothly.

[0029] As a further specific technical solution, the sealing assembly includes a vertical sealing plate 42 and an inclined sealing gasket 43 fixedly connected to the upper end of the vertical sealing plate 42. The lower end of the vertical sealing plate 42 is fixedly arranged on the self-rotating member 41, and the inclined sealing gasket 43 is used to contact with the sector sealing plate of the air preheater. During use, when the inclined sealing gasket 43 is in interference contact and sealing with the sector sealing plate of the air preheater, it is subjected to frictional force and pressure. The frictional force and pressure drive the self-rotating member 41 to rotate to the right through the vertical sealing plate 42. Therefore, the vertical sealing plate 42 plays a role of force conduction during the sealing process.

[0030] As a further specific technical solution, the materials of the vertical sealing plate 42 and the inclined sealing gasket 43 are carbon steel or molybdenum disulfide composite material. Both carbon steel and molybdenum disulfide composite material are materials with high temperature resistance and not easy to deform, so that the vertical sealing plate 42 and the inclined sealing gasket 43 have good sealing effect and long service life.

[0031] As a further specific technical solution, the elastic component 5 includes a vertical rod 51 and a spring 52. The lower end of the vertical rod 51 is fixedly arranged on the support plate 2. The spring 52 is sleeved on the vertical rod 51, and the lower end of the spring 52 contacts the support plate 2. The pressing plate 6 is penetrated through the vertical rod 51 and contacts the upper end of the spring 52, so that the pressing plate 6 can compress the spring 52. Wherein, the upper end of the spring 52 is higher than the side where the self-rotating member 41 is connected to the pressing plate 6, so that the pressing plate 6 is inclined upward. In this embodiment, the pressing plate 6 is inclined upward at an angle of 15 degrees. The limiting member 7 is arranged at the upper end of the vertical rod 51 and above the pressing plate 6. In this embodiment, the vertical rod 51 is specifically a screw rod, and correspondingly, the limiting member 7 is a limiting nut, so as to prevent the pressing plate 6 from disengaging from the vertical rod 51 through the limiting nut.

[0032] As a further specific technical solution, a strip-shaped hole 411 is formed in the self-rotating member 41, so that the self-rotating member 41 can rotate along the outer surface of the cylinder 33 to adjust the sealing angle and the contact area. The limiting component includes a limiting screw 412 and a first limiting nut 413. The self-rotating member 41 is connected to the cylinder 33 through the limiting screw 412 penetrating through the strip-shaped hole 411. The first limiting nut 413 is rotatably arranged at one end of the limiting screw 412 exposed from the self-rotating member 41. By rotating the first limiting nut 413, the gap size between the self-rotating member 41 and the cylinder 33 can be adjusted, and further the distance between the inclined sealing gasket 43 and the air preheater sector plate can be adjusted. The limiting pin 412 functions to prevent the self-rotating member 41 from rotating and falling off.

[0033] As a further specific technical solution, a groove 331 is further formed in the cylinder 33 below the strip-shaped hole 411. The length of the groove 331 is smaller than the length of the strip-shaped hole 411, so that the furnace ash in the air preheater can fall into the groove 331, preventing the furnace ash from accumulating in the strip-shaped hole 411 and affecting the rotation of the self-rotating member 41. Since there is hot air flowing in the air preheater, the furnace ash falling into the groove 331 can be blown away by the hot air in the air preheater. Further, in order to prevent the hot air in the air preheater from not being able to completely blow out the furnace ash in the groove 331, resulting in dust accumulation in the groove 331 after a long time, a scraping plate 44 that can extend into the groove 331 is further arranged on the bottom end of the self-rotating member 41 on the side of the strip-shaped hole 411 away from the limiting pin 412. Through the arrangement of the scraping plate 44, during the rotation of the self-rotating member 41, the scraping plate 44 also moves accordingly, thereby scraping the furnace ash accumulated in the groove 331 loose, facilitating the hot air in the air preheater to blow it out, and preventing the furnace ash from accumulating in the groove 331 and affecting the smooth rotation of the self-rotating member 41.

[0034] Of course, in other embodiments, a sealing cover can also be arranged on the strip-shaped hole 411 to prevent furnace ash from entering the strip-shaped hole 411.

[0035] In this embodiment, the length of the vertical sealing plate 42 is the same as that of the self-rotating member 41. Since the vertical sealing plate 42 plays a role in force conduction, the same length enables a larger contact area between the vertical sealing plate 42 and the self-rotating member 41, resulting in a better force conduction effect. As a result, the vertical sealing plate 42 can drive the self-rotating member 41 to rotate faster and better.

[0036] The working principle of the present invention is as follows: First, adjustment is carried out in the cold state before the furnace is started. Rotate the first limit nut 413 to move the self-rotating member 41 downward, that is, to reduce the gap between the self-rotating member 41 and the cylinder 33. As a result, the distance between the inclined sealing gasket 43 and the air preheater sector plate becomes larger, so that a certain appropriate distance is achieved between the inclined sealing gasket 43 and the air preheater sector plate (this distance is predicted based on metal properties and experience, and the mushroom-shaped deformation formed by the stress generated by the radial partition after heating needs to be considered). This distance is generally about 1 cm. Since the sealing device of the present invention is fixedly connected to the radial partition 1 of the air preheater, when the radial partition 1 and the sealing assembly are heated during hot-state operation, the radial partition 1 will expand into an arch shape when heated, and there will be upward and outward extension. Therefore, the overall sealing device of the present invention is raised, and then the inclined sealing gasket 43 is in close contact with the sector sealing plate of the air preheater. After contact, the inclined sealing gasket 43 receives a frictional force to the right and a downward pressure. The inclined sealing gasket 43 then transmits the force to the self-rotating member 41 through the vertical sealing plate 42 to drive the self-rotating member 41 to rotate to the right. Since the pressing plate 6 is fixedly connected to the self-rotating member 41 to form an integral body, after the self-rotating member 41 rotates to the right, the pressing plate 6 presses downward, causing the spring 52 to be pressed downward. After the rotary air preheater runs away from the sector sealing plate, the spring 52 resets, and the self-rotating member 41 rotates counterclockwise to recover, completing one sealing cycle. This process uses elasticity to achieve good sealing between the inclined sealing gasket 43 and the sector plate of the air preheater, avoiding direct hard-contact mechanical sealing between the sealing plate and the sector plate of the air preheater, effectively reducing the air leakage rate of the rotary air preheater, reducing the operating power consumption, improving the boiler thermal efficiency, thereby reducing coal consumption, saving costs, and improving the reliability and service life of the rotary air preheater.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

Claims

1. A self-adjusting elastic boiler air preheater sealing device, applied to a boiler air preheater, the boiler air preheater having a radial partition, characterized in that: The sealing device includes a support assembly fixedly provided on one side of the radial partition plate; a self-rotating sealing assembly, which includes a self-rotating member and a sealing assembly fixedly provided on the self-rotating member. The self-rotating member is rotatably provided on the support assembly through a limiting assembly. One end of the limiting assembly passes through the self-rotating member and is fixed inside the support assembly. The gap between the self-rotating member and the support assembly can be adjusted through the limiting assembly; the sealing assembly is used to contact the sector sealing plate of the air preheater. The sealing assembly includes a vertical sealing plate and an inclined sealing gasket provided on the vertical sealing plate. One end of the vertical sealing plate away from the inclined sealing gasket is fixedly provided on the self-rotating member, and the inclined sealing gasket can be used to contact the sector sealing plate of the air preheater; and an elastic assembly fixedly provided on the side of the support assembly away from the radial partition plate. One end of the elastic assembly is fixedly provided on a support plate, one end of the support plate is fixedly connected to the radial partition plate, the other end of the elastic assembly is provided with a pressing plate passing through it, and one end of the pressing plate is fixedly connected to one side of the self-rotating member. A strip-shaped hole is provided on the self-rotating member. The limiting assembly includes a limiting screw and a first limiting nut. The self-rotating member is connected to the cylinder through the limiting screw passing through the strip-shaped hole. The first limiting nut is rotatably provided at the end of the limiting screw exposed from the self-rotating member. The gap size between the self-rotating member and the cylinder can be adjusted by rotating the first limiting nut; a limiting member is further provided above the pressing plate on the elastic assembly. The elastic assembly includes a vertical rod and a spring. One end of the vertical rod is fixedly provided on the support plate. The spring is sleeved on the vertical rod and one end of the spring contacts the support plate. The pressing plate passes through the vertical rod and contacts the end of the spring away from the support plate, so that the pressing plate can compress the spring; the limiting member is provided at the end of the vertical rod away from the support plate and above the pressing plate; a groove is further provided on the cylinder below the strip-shaped hole. The length of the groove is less than the length of the strip-shaped hole. A scraper that can extend into the groove is further provided on the bottom end of the self-rotating member on the side of the strip-shaped hole away from the limit pin; 2. The self-adjusting elastic boiler air preheater sealing device according to claim 1, wherein: the support assembly includes a vertical plate, an inclined plate and a cylinder. The vertical plate is fixedly connected to one side of the radial partition plate through a fixing bolt. The inclined plate is inclined towards the elastic assembly. One end of the inclined plate is fixedly connected to the upper end of the vertical plate, and the other end of the inclined plate is fixedly connected to the cylinder; the self-rotating member is rotatably provided on the cylinder; 3. The self-adjusting elastic boiler air preheater sealing device according to claim 1, characterized in that: the material of the inclined sealing gasket is carbon steel or molybdenum disulfide alloy material; 4. The self-adjusting elastic boiler air preheater sealing device according to claim 3, characterized in that: the vertical rod is a screw rod, and the limiting member is a second limiting nut; 5. The self-adjusting elastic boiler air preheater sealing device according to claim 2, characterized in that: the self-rotating member is a semi-circular plate member; 6. The self-adjusting elastic boiler air preheater sealing device according to claim 3, characterized in that: the length of the vertical sealing plate is the same as the length of the self-rotating member.

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