A structure that significantly reduces ash leakage at the boiler wall box

Abstract

This utility model proposes a structure that significantly reduces ash leakage at the boiler wall box, relating to the field of boiler soot removal technology. It includes a circular shell, frame, limiting plate, mounting roller, spring, mounting base, T-slot, magnet, high-temperature resistant arc plate, T-block, cover, external thread, internal thread, and perforation. This application can significantly reduce the amount of ash spilled into the environment during boiler steam soot removal due to slight positive pressure. Consequently, the drive wheel bearing of the steam soot blower head is less prone to jamming, thus preventing dry friction of the gun tube (extending the service life of the steam soot blower). Simultaneously, the amount of ash leakage is greatly reduced, significantly reducing pollution to the environment. The ring composed of 2-3 sets of high-temperature resistant arc plates effectively reduces the amount of ash flowing to the outside from the gap between the gun tube and the through hole. Furthermore, both the high-temperature resistant arc plate and the circular shell are easy to disassemble and maintain, resulting in better boiler soot removal performance.

Description

Technical Field

[0001] This utility model relates to the field of boiler ash removal technology, and more specifically, to a structure that significantly reduces ash leakage at the boiler wall box. Background Technology

[0002] Currently, ash leakage exists at the wall box of the steam sootblower in pulverized coal boilers (specifically, the leakage into the external environment is due to the gap between the through-hole allowing the sootblower's nozzle to pass through and the nozzle itself, which easily leads to ash leakage and overflow, originating from the furnace). The leakage is most severe in the upper water-cooled wall screen and high-pressure areas. Over time, the leaked fly ash can cause the sootblower head drive wheel bearing to jam, resulting in dry friction of the nozzle during sootblowing. This significantly shortens the equipment's lifespan and affects the continuous and stable operation of the steam sootblower, while also causing fly ash pollution and making on-site sanitation difficult. The existing upper water-cooled wall screen and high-pressure areas have relatively low furnace negative pressure, but sometimes exhibit slight positive pressure. The current wall box sealing structure is a negative pressure wall box, which cannot seal the fly ash ejected under positive pressure. Utility Model Content

[0003] The purpose of this invention is to solve the problems mentioned in the background art and to propose a structure that significantly reduces ash leakage at the boiler wall box.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A structure that significantly reduces ash leakage at the boiler wall box includes a circular shell, a frame, a limiting plate, a mounting roller, a spring, a mounting base, a T-slot, a magnet, a high-temperature resistant arc plate, a T-block, a cover, external threads, internal threads, and perforations.

[0006] One end of the open-ended circular shell is connected to the flange at the end of the wall box;

[0007] Several sets of frames are arranged inside the circular shell and distributed in a front-to-back manner, and each set includes four frames distributed about the circumference of the inner wall of the circular shell;

[0008] The mounting roller with a limiting plate fixed at the upper end slides in cooperation with the frame, and a spring is sleeved on the mounting roller and a mounting seat is connected to the end of the mounting roller;

[0009] One end of the spring is connected to the frame, and the other end of the spring is connected to the mounting base;

[0010] The T-slots are symmetrically opened on the mounting base, and magnets are installed inside the T-slots;

[0011] T-shaped blocks made of ferritic stainless steel and inserted into T-slots are symmetrically arranged on the high-temperature resistant arc plate.

[0012] The cap, which is wider at the top and narrower at the bottom, has external threads.

[0013] The internal thread is located inside the round shell and mates with the external thread;

[0014] The perforations, which have the same diameter as the through holes on the wall box and are distributed directly opposite each other, are made on the cover.

[0015] Furthermore, the high-temperature resistant arc plate is attached to the surface of the steam soot blower's barrel, and the four high-temperature resistant arc plates installed on a set of frames are combined into a ring, with 2 or 3 sets of frames arranged inside the circular shell.

[0016] Furthermore, the magnet is a samarium cobalt magnet.

[0017] Furthermore, the surfaces of the circular shell and the cover are provided with heat dissipation fins, and the circular shell, the cover, and the spring are all made of high-temperature resistant materials.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] Compared to existing technologies, this application can significantly reduce the amount of ash spilled into the environment during boiler steam cleaning due to slight positive pressure. Consequently, the bearing of the drive wheel of the steam sootblower head is less prone to jamming, thus avoiding dry grinding of the gun tube (extending the service life of the steam sootblower). At the same time, the amount of ash leakage is greatly reduced, thereby significantly reducing pollution to the site environment. The ring composed of 2-3 sets of high-temperature resistant arc plates can effectively reduce the amount of ash flowing to the outside from the gap between the gun tube and the through hole. Meanwhile, the high-temperature resistant arc plates and the circular shell are easy to disassemble and maintain, thus improving the boiler cleaning effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the installation of the round shell and the wall box;

[0022] Figure 3 for Figure 1 Enlarged view of section A (labeled A);

[0023] Figure 4 This is a schematic diagram of an external thread;

[0024] Figure 5 This is a diagram illustrating the perforation process;

[0025] Figure label:

[0026] 1. Round shell; 2. Frame; 3. Limiting plate; 4. Mounting roller; 5. Spring; 6. Mounting base; 7. T-slot; 8. High temperature resistant arc plate; 9. T-block; 10. Cover; 11. External thread; 12. Internal thread; 13. Perforation. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. The present utility model will be further described with reference to the accompanying drawings and embodiments:

[0028] like Figures 1 to 5 As shown, a structure that significantly reduces ash leakage at the boiler wall box includes a steam soot blower and a wall box (boiler wall and steam soot blower are not shown in the figure) mounted on the boiler furnace wall at one end. The wall box has a through-hole (not shown in the figure) that allows the soot blower's nozzle to pass through and extend into the boiler furnace cavity. It also includes a circular shell 1, a frame 2, a limiting plate 3, an mounting roller 4, a spring 5, a mounting base 6, a T-slot 7, and a magnet (not shown in the figure, but specifically a samarium cobalt magnet). Iron and samarium cobalt magnets, as rare-earth permanent magnets, have a coercivity exceeding 20 kOe and a magnetic field strength far exceeding that of ordinary magnets. They possess a strong adsorption capacity for ferromagnetic materials (such as iron, cobalt, nickel, and their alloys), withstand temperatures up to 350-550℃, have high coercivity (>20 kOe), and exhibit a magnetic attenuation rate of <5% / 100℃ at high temperatures, making them suitable for intermittent high-temperature operations in steam soot blowers. (The remaining text appears to be unrelated and likely refers to a different product: 8. High-temperature resistant arc plate; 9. T-block; 10. Cover; 11. External thread; 12. Internal thread; and 13. Perforation.)

[0029] One end of the open-ended circular shell 1 is connected to the flange at the other end of the wall box;

[0030] Several sets of frames 2 are arranged inside the circular shell 1 and distributed in a front-to-back manner, and each set includes four frames 2 distributed about the circumference of the inner wall of the circular shell 1.

[0031] The mounting roller 4, which is fixed with a limiting plate 3 at the upper end, slides with the frame 2, and a spring 5 is sleeved on the mounting roller 4 and a mounting seat 6 is connected to the end of the mounting roller 4.

[0032] One end of the spring 5 is connected to the frame 2, and the other end of the spring 5 is connected to the mounting base 6;

[0033] T-slots 7 are symmetrically opened on the mounting base 6, and magnets are installed inside the T-slots 7;

[0034] T-shaped blocks 9, made of ferritic stainless steel and inserted into T-slots 7, are symmetrically arranged on the high-temperature resistant arc plate 8.

[0035] The cover body 10, which is wider at the top and narrower at the bottom, is provided with external threads 11;

[0036] The internal thread 12 is located inside the round shell 1 and mates with the external thread 11;

[0037] Perforations 13, with the same diameter as the through holes on the wall box and distributed directly opposite each other, are opened on the cover 10.

[0038] In a further refinement of the embodiment of this utility model, the high-temperature resistant arc plate is attached to the surface of the gun barrel of the steam soot blower, and the four high-temperature resistant arc plates installed on a set of frames are combined into a ring, with 2 or 3 sets of frames arranged inside the circular shell.

[0039] The working process of this utility model:

[0040] Before installing the steam soot blower barrel into the through hole of the wall box, first connect the wall box and the round shell 1 through the flange. The flange installation with gasket can improve the sealing effect and facilitate the subsequent disassembly of the round shell 1 for replacement and maintenance. After the round shell 1 is stably fixed at the end of the wall box, install 2-3 sets of high-temperature resistant arc plates 8 from the inside to the outside. During installation, align the T-shaped block 9 on the high-temperature resistant arc plate 8 with the T-shaped groove 7 on the mounting base 6 and insert it (the T-shaped block 9 and the T-shaped groove 7 can accurately define the positional relationship between the high-temperature resistant arc plate 8 and the mounting base 6). Then, the samarium cobalt magnet can achieve adsorption and positioning of the T-shaped block 9. The state after all the high-temperature resistant arc plates 8 are installed is as shown in the attached instruction manual. Figure 1 As shown in the figure (where samarium cobalt magnets can withstand higher temperatures, and the T-shaped block 9 made of ferritic stainless steel can effectively reduce the interference of temperature on magnetism).

[0041] Then, the cover 10 is threaded onto the other end of the round shell 1, and the gun barrel of the steam soot blower is inserted through the perforation 13. The gun barrel then passes through several sets of high-temperature resistant arc plates 8 in a ring and enters the wall box (the inner wall of each set of rings is completely and circumferentially wrapped and fitted to the surface of the gun barrel). Finally, the gun barrel reaches the furnace cavity and the subsequent soot blowing process in the boiler can be carried out (the steam soot blower adopts the existing technology without modification, and it extends into different positions in the furnace cavity to blow soot by driving the gun barrel to move back and forth).

[0042] During the ash removal process, the gun barrel rotates. At this time, the ring composed of high-temperature resistant arc plates 8 moves along with the deflection generated by the rotation of the gun barrel under the elastic push. Meanwhile, the inner wall of the ring is always in contact with the surface of the gun barrel. This can significantly reduce the amount of ash spilled into the environment due to the slight positive pressure during the boiler ash removal process. As a result, the bearing of the drive wheel of the steam soot blower head is less likely to jam, thus avoiding dry grinding of the gun barrel. At the same time, the amount of ash leakage is greatly reduced, thereby significantly reducing the pollution to the site environment.

[0043] To dissipate heat promptly and prevent overheating that could lead to a decrease in material strength or deformation, the above-described embodiment is further optimized by providing heat dissipation fins on the surfaces of both the circular shell 1 and the cover 10. Furthermore, the circular shell 1, the cover 10, and the spring 5 are all made of high-temperature resistant materials. The heat dissipation fins are not shown in the figures. Specifically, the circular shell 1 and the cover 10 are made of 310S stainless steel, and the spring 5 is a high-temperature spring.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A structure that significantly reduces ash leakage at the boiler wall box, comprising a round shell (1), a frame (2), a limiting plate (3), an installation roller (4), a spring (5), a mounting base (6), a T-slot (7), a magnet, a high-temperature resistant arc plate (8), a T-block (9), a cover (10), an external thread (11), an internal thread (12), and a perforation (13). One end of the open-ended circular shell (1) is connected to the end flange of the wall box; Several sets of frames (2) are arranged inside the round shell (1) and distributed in front and behind, and each set includes four frames (2) distributed around the inner wall of the round shell (1). The mounting roller (4) with a limiting plate (3) fixed at the upper end slides with the frame (2), and a spring (5) is sleeved on the mounting roller (4) and a mounting seat (6) is connected to the end of the mounting roller (4). One end of the spring (5) is connected to the frame (2), and the other end of the spring (5) is connected to the mounting base (6); T-slots (7) are symmetrically opened on the mounting base (6), and magnets are provided in the T-slots (7); T-shaped blocks (9) made of ferritic stainless steel and inserted into T-slots (7) are symmetrically arranged on the high-temperature resistant arc plate (8). The cover (10), which is wider at the top and narrower at the bottom, is provided with external threads (11). The internal thread (12) is located inside the round shell (1) and mates with the external thread (11); Perforations (13) of the same diameter as the through holes on the wall box and distributed in a direct line are opened on the cover (10).

2. A structure for significantly reducing the amount of ash leakage at the wall box of a boiler according to claim 1, wherein The high-temperature resistant arc plate (8) is attached to the surface of the gun barrel of the steam soot blower, and the four high-temperature resistant arc plates (8) installed on a set of frames (2) are combined into a ring. Two or three sets of frames (2) are arranged inside the round shell (1).

3. The structure of claim 1, wherein The magnet is a samarium cobalt magnet.

4. The structure of claim 1, wherein The surfaces of the round shell (1) and the cover (10) are provided with heat dissipation fins, and the round shell (1), the cover (10) and the spring (5) are all made of high temperature resistant materials.

Images