High-temperature corrosion prevention and control device for water cooling wall of boiler

Abstract

The invention discloses a boiler water-cooled wall high-temperature corrosion prevention device, which relates to the technical field of water-cooled wall corrosion prevention, and comprises a water-cooled wall arranged on four sides, and an upper water tank and a lower water tank which are arranged at the upper end and the lower end of the water-cooled wall respectively, and a first water outlet and a second water outlet are formed in the lower end of the upper water tank and the upper end of the lower water tank respectively; the area of the first lower water outlet is smaller than that of the second lower water outlet, each water cooling wall comprises a plurality of square pipe bodies arranged in a straight line, water in the upper water tank can sequentially pass through the first lower water outlet, the square pipe bodies and the second lower water outlet to enter the lower water tank, and water in the lower water tank can flow back into the upper water tank through the water pump. According to the invention, through the arrangement of the square pipe body, an external wind source can cover the water cooling wall in a larger area, so that an oxidizing gas film with wider coverage is formed on the side surface of the square pipe body.

Description

Technical Field

[0001] The invention relates to the technical field of water-cooled wall corrosion prevention, and more particularly to a boiler water-cooled wall high-temperature corrosion prevention device. Background Art

[0002] In recent years, with the continuous improvement of national environmental protection standards, various coal-fired power plants have implemented ultra-low emission transformation of nitrogen oxides (NOx). Low-nitrogen staged combustion technology has been widely used in reducing nitrogen oxide emissions in thermal power plants due to its mature technology and efficient NOx removal capabilities. However, the application of low-nitrogen staged combustion technology has also brought about the problem of high-temperature corrosion of water-cooled walls. The main reasons include:

[0003] Reducing atmosphere destroys the protective film: Staged combustion will form a reducing atmosphere in the furnace, destroying the original Fe2O3 protective film on the surface of the water-cooled wall and transforming it into loose and porous FeO. This transformation allows CO and oxidants to penetrate the FeO and continue to react with the tube wall, forming a vicious cycle;

[0004] Sulfide corrosion: In a reducing atmosphere, the sulfur in the coal will be converted into H2S, which will react with the tube wall metal or FeO to form FeS, leading to sulfide corrosion. This is one of the most common forms of corrosion of water-cooled walls;

[0005] Solid particle scouring: The amount of incompletely burned carbon in the furnace increases, causing the solid particles carried in the high-speed airflow to scour and cut the tube wall, further aggravating corrosion.

[0006] In order to reduce the high temperature corrosion of the water-cooled wall, the high temperature corrosion of the water-cooled walls on both sides can be fundamentally reduced. The main ideas for solving the high temperature corrosion of the water-cooled wall in the existing technology are as follows:

[0007] Additional wind boxes or wind chambers: additional wind boxes or wind chambers are arranged at the bottom of the furnace, and wind is added to the water-cooled wall area by opening holes several meters apart in the water-cooled wall corrosion area. In this method, since the air volume comes from the secondary air large wind box, the wind pressure is limited, resulting in insufficient impact force of the wind jet added to the water-cooled wall. As it moves upward along the wall, it continues to diffuse and is consumed by the hot flue gas in the furnace. In addition, since the holes are several meters apart, an oxidizing atmosphere film cannot be formed in the high-temperature corrosion area, and the protective effect is lost.

[0008] Direct opening and air leakage: Direct opening and air leakage on the water-cooled wall, using the negative pressure of the furnace to draw cold air from outside the furnace into the furnace. The air inhaled by this method is directly perpendicular to the water-cooled wall, and an oxidizing film cannot be formed on the surface of the tube wall. In addition, the amount of air inhaled is difficult to control and the temperature is too low, which not only affects the nitrogen reduction effect, but also leads to a decrease in boiler combustion efficiency.

[0009] Arrangement of burnout air nozzles: Multiple lateral burnout air nozzles are arranged in the burnout area of ​​the furnace, and the air volume accounts for about 10% of the total air volume. Although this method increases the jet impact force, it will affect the air volume for combustion, and it is also impossible to achieve uniform protection of the water-cooled wall surface.

[0010] Similarly, a Chinese invention patent with application number CN202210023758.1 discloses a method and device for preventing and treating high-temperature corrosion of a boiler water-cooled wall, the device comprising: a furnace wall surrounded by multiple water-cooled walls, a single water-cooled wall cut pipe, supporting angle steel, pipes, valves, and flow meters. The single water-cooled wall cut pipe and the furnace wall surrounded by multiple water-cooled walls are fixed by supporting angle steel at a distance of 3-10 cm from the water-cooled fireplace wall along the inner direction of the furnace, one end of the single water-cooled wall cut pipe is blocked, and the other end is connected to the high-pressure fan through a pipe, and valves and flow meters are arranged on the pipe. Although the boiler can be modified during the boiler overhaul, which has the advantages of small modification workload, easy engineering implementation, and good anti-corrosion effect, the method and device for preventing and treating high-temperature corrosion of the boiler water-cooled wall still need on-site modification, which is time-consuming and labor-intensive, and the use of round pipes will result in the formed sealing film not being able to completely cover the round pipe on one side of the furnace.

[0011] Therefore, it is necessary to propose a boiler water-cooled wall high-temperature corrosion prevention device to solve the above problems. Summary of the invention

[0012] The purpose of the present invention is to solve the problem that the existing methods and devices for preventing and controlling high-temperature corrosion of boiler water-cooled walls still need on-site modification, which is time-consuming and labor-intensive, and the use of round tubes will result in the formed sealing film not being able to completely cover the round tube on one side of the furnace.

[0013] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0014] A boiler water-cooled wall high-temperature corrosion prevention device comprises water-cooled walls arranged on four sides and an upper water tank and a lower water tank arranged at the upper and lower ends of the water-cooled walls, wherein the lower end of the upper water tank and the upper end of the lower water tank are respectively provided with a first water outlet and a second water outlet, wherein the first water outlet is smaller than the area of ​​the second water outlet, and each of the water-cooled walls comprises a plurality of square tubes arranged in a line, and water in the upper water tank can flow to the lower water tank through the first water outlet, the square tube and the second water outlet in sequence, and water in the lower water tank can flow back to the upper water tank through a water pump;

[0015] The square tube bodies at both ends of each water-cooled wall are fixedly arranged, and the square tube bodies in the middle section can be moved toward the center of the upper water tank. First air holes are opened on both sides of the square tube bodies in the middle section, and a ventilation mechanism that can be extended into the square tube bodies is arranged in the middle of the square tube bodies;

[0016] When the square tube moves, the upper end first blocks the first water outlet, so that water flows into the lower water tank from the second water outlet, and the ventilation mechanism extends into the square tube to connect to an external air source, so that the air source blows to the side of the square tube toward the center of the upper water tank through the first air hole;

[0017] When each of the water-cooled walls is arranged in a line, the first air holes are blocked.

[0018] Furthermore, it also includes a grille, wherein the grille is fixedly connected to the side facing the center of the upper water tank with three rows of connection plates, and the end of the connection plate away from the grille is fixedly connected to a blocking rod;

[0019] Both sides of the square tube body are provided with recessed grooves and sockets matching with the connecting plate. The sockets on the opposite sides of every two adjacent square tube bodies form a first sliding space for the connecting plate to slide, and the recessed grooves on the opposite sides of every two adjacent square tube bodies form a second sliding space for the blocking rod to slide. When each of the water-cooled walls is arranged in a line, the first air hole is blocked by the blocking rod.

[0020] Furthermore, the upper and lower ends of the square tube body are fixedly connected with square tube heads, the end of the square tube head away from the center of the upper water tank is fixedly connected with a baffle, the lower end surface of the upper water tank and the upper end surface of the lower water tank are both provided with guide grooves for sliding of the square tube head and the baffle, and the baffle is used to cover the first water outlet and the second water outlet.

[0021] Furthermore, the ventilation mechanism includes a C-shaped plate and a ventilation assembly, and the upper and lower ends of the side of the square tube body away from the center of the upper water tank are symmetrically provided with strip through holes, and the two ends of the C-shaped plate are slidably connected in the strip through holes. The cross-sections of the two ends of the C-shaped plate are T-shaped, and the inner side of the square tube body is provided with plate grooves for plugging the two ends of the C-shaped plate, and the C-shaped plate is plugged into the square tube body as the ventilation assembly is extended.

[0022] Furthermore, the ventilation assembly includes an air transfer tube rotatably connected to the middle part of the C-shaped plate, a second air hole opened on the outer side of the air transfer tube, a strip rod symmetrically fixedly connected to the outer side of the air transfer tube, and a plug rotatably connected to the end of the air transfer tube away from the C-shaped plate, the outer side surface of the plug is symmetrically connected with a strip block, the strip block and the strip rod are connected by magnetic attraction, and a matching through hole for slidingly plugging the air transfer tube, the strip rod, the plug and the strip block is opened in the middle of the side of the square tube body away from the center of the upper water tank, and the horizontal length of the plug is at least equal to the depth of the matching through hole.

[0023] Furthermore, the external air source includes an external air duct and a fan for supplying air to the external air duct;

[0024] A positioning groove is provided at one end of the air transmission pipe away from the plug, a positioning rod which can be inserted into the positioning groove is fixed to the inner side of one end of the external air pipe facing the air transmission pipe, and a locking mechanism for temporarily fixing the external air pipe and the air transmission pipe is provided on the outer side of the air transmission pipe.

[0025] Furthermore, the locking mechanism includes a turning handle rotatably connected to the outer side of the air transmission tube, an L-shaped connecting rod symmetrically fixedly connected to the side of the turning handle facing the external air duct, and a connecting groove opened on the outer side of the L-shaped connecting rod. The end of the L-shaped connecting rod away from the turning handle can slide into the connecting groove, and the air transmission tube and the external air duct are locked by rotating the turning handle.

[0026] Furthermore, a semi-circular rotation groove is provided on the outer side of the air transmission tube, a convex block is slidably connected in the rotation groove, and the convex block is fixedly connected to the inner side of the rotating handle;

[0027] When each of the water-cooled walls is arranged in a line, the rotating handle is rotated to a horizontal position and fits against the outer side of the grille. When the square tube body moves and the ventilation mechanism penetrates into the square tube body, it is used to connect an external air duct, and when the rotating handle is rotated to a horizontal position, it can be locked on the connecting plate in the middle of the grille.

[0028] Furthermore, matching grooves are symmetrically provided on both sides of the connecting plate in the middle of the grille, the turning handle can be rotated into the matching grooves, circular holes are provided at both ends of the turning handle, and a U-shaped plug rod is slidably connected to the connecting plate and inserted into the circular holes.

[0029] Furthermore, a rectangular through hole is opened in the middle of the connecting plate in the middle of the grille, a connecting block is fixedly connected to the middle of the U-shaped plug rod in the rectangular through hole, a spring is fixedly connected to the side of the connecting block facing the middle of the U-shaped plug rod, and one end of the spring away from the connecting block is fixedly connected to the connecting plate.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The present invention, through the arrangement of the square tube body, can enable the external wind source to cover a larger area of ​​the water-cooled wall, thereby forming an oxidizing gas film with wider coverage on the side of the square tube body.

[0032] 2. The present invention, through the setting of the square tube body, can move the square tube body to multiple positions for use as an air pipe, which is more convenient to use. At the same time, through the setting of the ventilation mechanism, the square tube body can achieve both water cooling and air pipe effects.

[0033] 3. The present invention can facilitate the connection to an external air duct through the setting of the turning handle. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a front view schematic diagram of the present invention;

[0035] Figure 2 It is a three-dimensional schematic diagram of the present invention;

[0036] Figure 3 It is a three-dimensional cross-sectional schematic diagram of the present invention;

[0037] Figure 4 It is a three-dimensional schematic diagram of a single-sided water-cooled wall structure in the present invention;

[0038] Figure 5 It is a schematic front view of a single-sided water-cooled wall structure in the present invention;

[0039] Figure 6 It is a side view schematic diagram of the single-sided water-cooled wall structure of the present invention;

[0040] Figure 7 It is a top view schematic diagram of a single-sided water-cooled wall structure in the present invention;

[0041] Figure 8 It is a three-dimensional cross-sectional schematic diagram of a single-sided water-cooled wall structure in the present invention;

[0042] Fig. 9 It is a three-dimensional schematic diagram of the connection structure of a single square tube body in the present invention;

[0043] Fig.10 It is a three-dimensional separation schematic diagram of the connection structure at a single square tube body in the present invention;

[0044] Fig.11 It is a three-dimensional cross-sectional schematic diagram of the connection structure of a single air transmission pipe in the present invention;

[0045] Fig.12 For the present invention Figure 3 The enlarged schematic diagram at A in the middle;

[0046] Fig.13 For the present invention Figure 3 The enlarged schematic diagram of point B in the middle;

[0047] Fig.14 A simplified schematic diagram of the protruding position of the square tube in one of the water-cooled wall arrangement solutions of the present invention;

[0048] Fig.15 It is a plan view of the protruding position of the square tube body in one of the water-cooled wall setting schemes of the present invention.

[0049] Figure numerals: 1. grille; 2. connecting plate; 3. baffle; 4. square tube body; 5. plug hole; 6. first air hole; 7. recessed groove; 8. strip through hole; 9. C-shaped plate; 10. matching through hole; 11. air transfer pipe; 12. second air hole; 13. strip rod; 14. plug; 15. strip block; 16. turning handle; 17. bump; 18. rotating groove; 19. external air duct; 20. positioning groove; 21. connecting groove; 22. L-shaped connecting rod; 23. U-shaped plug rod; 24. connecting block; 25. spring; 26. matching groove; 27. square tube head; 28. baffle; 29. ​​upper water tank; 30. lower water tank; 31. first water outlet; 32. second water outlet; 33. guide groove; 34. water pump; 35. round hole; 36. plate groove. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] See also Figure 1-15 A boiler water-cooled wall high-temperature corrosion prevention device includes water-cooled walls arranged on four sides and an upper water tank 29 and a lower water tank 30 arranged at the upper and lower ends of the water-cooled walls. How to set them in actual operation is based on actual conditions. For example, the lower water tank 30 is buried below the ground to prevent the boiler from contacting the lower water tank 30. The lower end of the upper water tank 29 and the upper end of the lower water tank 30 are respectively provided with a first water outlet 31 and a second water outlet 32. Fig.12 and Fig.13 As shown, the first water outlet 31 is smaller than the area of ​​the second water outlet 32, and each water-cooled wall includes a plurality of square tube bodies 4 arranged in a line. On the one hand, the square tube body 4 has a high space utilization rate and a large water flow rate. On the other hand, the side surfaces of the square tube body 4 are flush, which is convenient for the wind film to protect the square tube body 4. The water in the upper water tank 29 can pass through the first water outlet 31, the square tube body 4, and the second water outlet 32 ​​in sequence to the lower water tank 30, and the water in the lower water tank 30 can flow back to the upper water tank 29 through the water pump 34. In addition, some water treatment mechanisms, such as cooling mechanisms, can be set in the reflux process to reduce the temperature of the water entering the upper water tank 29 to achieve a better water cooling effect.

[0052] The square tube bodies 4 at both ends of each water-cooled wall are fixedly arranged and are not movable to avoid interference between the ends of the two adjacent water-cooled walls. Except for the two ends, the square tube bodies 4 in the middle section can be moved toward the center of the upper water tank 29. The first air holes 6 are provided on both sides of the square tube bodies 4 in the middle section, and a ventilation mechanism that can be extended into the square tube bodies 4 is provided in the middle of the square tube bodies 4, so that an external air source enters the square tube bodies 4.

[0053] When the square tube body 4 moves, the upper end first blocks the first water outlet 31, so that water flows from the second water outlet 32 ​​into the lower water tank 30, and the ventilation mechanism extends into the square tube body 4 for connecting to an external air source, so that the air source blows to the side of the square tube body 4 toward the center of the upper water tank 29 through the first air hole 6;

[0054] When each water-cooling wall is arranged in a straight line, that is, when the square tube body 4 is not moved, the first air hole 6 is blocked. At this time, the square tube body 4 is used for water cooling and for water flow to pass through.

[0055] Specific, combined Figure 1-8 As shown, the boiler water wall high temperature corrosion prevention device also includes a grille 1, which is fixed by multiple columns of longitudinal bars and multiple rows of transverse bars. The grille 1 is fixedly connected with three rows of upper, middle and lower connecting plates 2 on one side facing the center of the upper water tank 29, and the end of the connecting plate 2 away from the grille 1 is fixedly connected with a blocking rod 3. During actual installation, the grille 1 needs to be fixed on the ground or the wall, which is equivalent to arranging the square tube 4 through the connecting plate 2;

[0056] Both sides of the square tube body 4 are provided with recessed grooves 7 and insertion holes 5 that cooperate with the connecting plate 2, so that the insertion holes 5 on the opposite side of every two adjacent square tube bodies 4 form a first sliding space for the connecting plate 2 to slide, and the recessed grooves 7 on the opposite side of every two adjacent square tube bodies 4 form a second sliding space for the blocking rod 3 to slide. When each water-cooled wall is arranged in a line, the first air hole 6 is blocked by the blocking rod 3. In order to ensure the sealing, both sides of the blocking rod 3 can be set as sealing layers, such as rubber layers and silicone layers, so that when the blocking rod 3 blocks the first air hole 6, water is prevented from flowing out of the first air hole 6.

[0057] Specific, combined Figure 3 , Fig.12 and Fig.13As shown, the upper and lower ends of the square tube body 4 are fixedly connected with a square tube head 27, and the end of the square tube head 27 away from the center of the upper water tank 29 is fixedly connected with a baffle 28. The lower end surface of the upper water tank 29 and the upper end surface of the lower water tank 30 are provided with guide grooves 33 for the square tube head 27 and the baffle 28 to slide. The baffle 28 is used to cover the first water outlet 31 and the second water outlet 32. When the square tube body 4 reaches a certain position, the baffle 28 completely covers the first water outlet 31, and the baffle 28 half covers the second water outlet 32, so that the water in the square tube body 4 can be discharged without affecting the subsequent ventilation. Similarly, in order to ensure the sealing performance, a sealing layer is provided on the side of the square tube head 27 and the baffle 28 away from the square tube body 4 to increase the contact tightness with the lower end surface of the upper water tank 29 and the upper end surface of the lower water tank 30 to prevent water leakage.

[0058] Specific, combined Figure 9-11 As shown, the ventilation mechanism includes a C-shaped plate 9 and a ventilation component. The upper and lower ends of the square tube body 4 away from the center of the upper water tank 29 are symmetrically provided with strip through holes 8. The two ends of the C-shaped plate 9 are slidably connected in the strip through holes 8. The cross-sections of the two ends of the C-shaped plate 9 are horizontally T-shaped. The inner side of the square tube body 4 is provided with plate grooves 36 for plugging the two ends of the C-shaped plate 9. The C-shaped plate 9 and the square tube body 4 are also sealed to prevent air and water leakage. The C-shaped plate 9 is plugged into the square tube body 4 as the ventilation component is extended.

[0059] Specific, combined Figure 9-11 As shown, the ventilation assembly includes an air transfer tube 11 rotatably connected to the middle of the C-shaped plate 9, a second air hole 12 opened on the outer side of the air transfer tube 11, a strip rod 13 symmetrically fixedly connected to the outer side of the air transfer tube 11, and a plug 14 rotatably connected to the end of the air transfer tube 11 away from the C-shaped plate 9 to prevent water from flowing out of the air transfer tube 11. The outer side of the plug 14 is symmetrically connected to a strip block 15. The strip block 15 and the strip rod 13 are connected by magnetic attraction. When the air transfer tube 11 is contracted, the magnetic attraction can prevent the strip block 15 and the strip rod 13 from being misaligned, ensuring that the plug 14 can move to the matching through hole 10. The opening in the middle of the side of the square tube body 4 away from the center of the upper water tank 29 There is a matching through hole 10 for slidingly plugging in the matching through hole 10 for matching the air transmission tube 11, the strip rod 13, the plug 14 and the strip block 15. When the air transmission tube 11 moves to the matching through hole 10, the matching through hole 10 restricts the strip rod 13. The strip block 15 and the strip rod 13 are always adsorbed by magnetic attraction, so that the air transmission tube 11 can only move horizontally. When the plug 14 moves into the matching through hole 10, the strip block 15 is restricted in the matching through hole 10, so that the strip rod 13 can rotate relative to the strip block 15. In order to prevent the strip rod 13 from being stuck in the matching through hole 10 when the plug 14 moves into the matching through hole 10, the horizontal length of the plug 14 is at least equal to the depth of the matching through hole 10.

[0060] Specific, combined Figure 9-11As shown, the external air source includes an external air duct 19 and a fan for supplying air to the external air duct 19. For details, reference may be made to the corresponding structure of a device for preventing and controlling high-temperature corrosion of a boiler water-cooled wall disclosed in the invention patent with application number 202210023758.1;

[0061] A positioning groove 20 is provided at one end of the air transmission tube 11 away from the plug 14, and a positioning rod which can be inserted into the positioning groove 20 is fixed to the inner side of one end of the external air tube 19 facing the air transmission tube 11. The positioning rod and the positioning groove 20 cooperate with each other, not only for positioning, but also for preventing the air transmission tube 11 from rotating after installation. A locking mechanism is provided on the outer side of the air transmission tube 11 for temporarily fixing the external air tube 19 and the air transmission tube 11.

[0062] Specific, combined Figure 9-11 As shown, the locking mechanism includes a handle 16 rotatably connected to the outer side of the air transfer tube 11, an L-shaped connecting rod 22 symmetrically fixedly connected to the side of the handle 16 facing the external air duct 19, and a connecting groove 21 opened on the outer side of the L-shaped connecting rod 22. The connecting groove 21 includes a transverse slide groove and a circular groove connected thereto, and the side of the circular groove facing the center of the upper water tank 29 is a slope. As the L-shaped connecting rod 22 moves on the slope, the tightness of the connection with the external air duct 19 can be increased, so that the end of the L-shaped connecting rod 22 away from the handle 16 can slide into the connecting groove 21, and the air transfer tube 11 and the external air duct 19 are locked by rotating the handle 16.

[0063] Specific, combined Fig.10 As shown, a semi-circular rotating groove 18 is provided on the outer side of the air transmission tube 11, a convex block 17 is slidably connected in the rotating groove 18, and the convex block 17 is fixedly connected to the inner side of the rotating handle 16;

[0064] When each water-cooled wall is arranged in a line, the handle 16 is rotated to a horizontal position and fits against the outer side of the grille 1 to fix the position of the square tube body 4. An anti-slip layer can also be provided on the inner side of the handle 16 to increase the friction between the handle 16 and the grille 1. When the square tube body 4 moves and the ventilation mechanism penetrates into the square tube body 4, it is used to connect the external air duct 19, and the handle 16 can be locked on the connecting plate 2 in the middle of the grille 1 when it is rotated to a horizontal position.

[0065] Specific, combined Figure 8 As shown, matching grooves 26 are symmetrically provided on both sides of the connecting plate 2 in the middle of the grille 1. The end of the turning handle 16 can be rotated into the matching groove 26. Circular holes 35 are provided at both ends of the turning handle 16. A U-shaped plug rod 23 is slidably connected to the connecting plate 2 and inserted into the circular hole 35 to lock the position of the turning handle 16.

[0066] Specific, combined Figure 8As shown, a rectangular through hole is opened in the middle of the connecting plate 2 in the middle of the grille 1, and a connecting block 24 is fixedly connected to the middle of the U-shaped plug rod 23 in the rectangular through hole. A spring 25 is fixedly connected to the connecting block 24 on one side facing the middle of the U-shaped plug rod 23, and one end of the spring 25 away from the connecting block 24 is fixedly connected to the connecting plate 2 to facilitate the automatic resetting of the U-shaped plug rod 23.

[0067] Working principle: When it is necessary to form a wind film to protect the water-cooled wall, Figure 1 Taking the state shown in as an example, first push the handle 16 to drive the air transmission tube 11 to push the square tube body 4, and the square tube body 4 moves along the connecting plate 2, so that the baffle 28 above the square tube body 4 blocks the first water outlet 31. At this time, the baffle rod 3 no longer blocks the first air hole 6, and the baffle 28 below the square tube body 4 cannot completely block the second water outlet 32, so that the water in the square tube body 4 flows from the second water outlet 32 ​​into the lower water tank 30;

[0068] Then, the handle 16 is rotated counterclockwise, and the air transmission tube 11 is driven to rotate counterclockwise by 90° under the action of the protrusion 17, so that the bar block 15 and the bar rod 13 are attracted to each other, and then the handle 16 is rotated clockwise by 90° to avoid interference between the handle 16 and the grille 1. At this time, under the restriction of the through hole 10, the rotation of the air transmission tube 11 is restricted, so that the handle 16 is driven, and the handle 16 can be pushed at this time, and the air transmission tube 11 and the C-shaped plate 9 are driven to be inserted into the square tube body 4, so that the upper and lower ends of the C-shaped plate 9 block the upper and lower ends of the square tube body 4, so that the square tube body 4 between the upper and lower ends of the C-shaped plate 9 forms a sealed space;

[0069] At this time, the external air duct 19 is aligned with the end of the air transmission tube 11 and inserted clockwise, and then the handle 16 is rotated clockwise, and the handle 16 drives the L-shaped connecting rod 22 to rotate. Under the setting of the slope of the connecting groove 21, the L-shaped connecting rod 22 will gradually tighten the external air duct 19, and the installation of the external air duct 19 is completed;

[0070] Then, the handle 16 is rotated 90° clockwise, and the U-shaped plug rod 23 is pulled to drive the connecting block 24 to compress the spring 25, and the handle 16 is rotated to the matching groove 26, and then the U-shaped plug rod 23 is loosened, and the U-shaped plug rod 23 is driven to be inserted into the round hole 35 under the action of the rebound force of the spring 25, so as to complete the position fixation of the air transfer pipe 11 and the C-shaped plate 9, and then the fan is started, and the wind passes through the external air pipe 19, the air transfer pipe 11, and the second air hole 12 to the square tube body 4 in sequence, so that the wind passes through the first air hole 6 to the outer side surface of the other square tube body 4 of the water-cooled wall, thereby blowing the corrosive substances on the surface of the square tube body 4 to avoid high-temperature corrosion of the square tube body 4;

[0071] When resetting the square tube body 4, the above steps can be reversed to disassemble and reset.

[0072] In summary, the above Figure 1 and Figure 2 The space on the inner side of the water-cooled wall is for reference only, and the user can set the number of square tubes 4 on the front and rear walls according to the size of the furnace.

[0073] For example Fig.14 Fig.15 As shown, the length of the front and rear walls is much greater than the width of the left and right walls, which is mainly suitable for octagonal reverse double-cut circle boilers. For example, the front and rear walls need to have six protruding square tubes 4 (except for the square tubes 4 at both ends of the front and rear walls, each square tube 4 of the front and rear walls can be moved, so these six square tubes 4 can be Fig.14 The square tube bodies 4 at adjacent positions of the small square frame shown in the figure can prevent a single square tube body 4 from being blown for a long time and causing itself to be broken by high temperature), forming 6 air outlets to blow air to the water-cooled wall. At this time, the left and right walls only play a water cooling role (that is, the square tube bodies 4 do not need to protrude). The wind blown out by the square tube bodies 4 at both ends of the front and rear walls forms a wind film on the surfaces of the left and right walls. The opening angles of the first air holes 6 on the square tube bodies 4 at both ends of the front and rear walls are specifically set according to actual conditions so that they can be blown to the water-cooled walls of the left and right walls.

[0074] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A boiler water wall high temperature corrosion prevention device, characterized in that: It includes water-cooled walls arranged on four sides and an upper water tank and a lower water tank arranged at the upper and lower ends of the water-cooled walls. The lower end of the upper water tank and the upper end of the lower water tank are respectively provided with a first water outlet and a second water outlet. The first water outlet is smaller than the area of ​​the second water outlet. Each of the water-cooled walls includes a plurality of square tubes arranged in a line. Water in the upper water tank can flow to the lower water tank through the first water outlet, the square tube and the second water outlet in sequence. Water in the lower water tank can flow back to the upper water tank through a water pump. The square tube bodies at both ends of each water-cooled wall are fixedly arranged, and the square tube bodies in the middle section can be moved toward the center of the upper water tank. First air holes are opened on both sides of the square tube bodies in the middle section, and a ventilation mechanism that can be extended into the square tube bodies is arranged in the middle of the square tube bodies; When the square tube moves, the upper end first blocks the first water outlet, so that water flows into the lower water tank from the second water outlet, and the ventilation mechanism extends into the square tube to connect to an external air source, so that the air source blows to the side of the square tube toward the center of the upper water tank through the first air hole; When each of the water-cooled walls is arranged in a line, the first air holes are blocked.

2. A boiler water wall high temperature corrosion prevention device according to claim 1, characterized in that: It also includes a grille, wherein one side of the grille facing the center of the upper water tank is fixedly connected to three rows of connecting plates, upper, middle and lower, and one end of the connecting plate away from the grille is fixedly connected to a blocking rod; Both sides of the square tube body are provided with recessed grooves and sockets matching with the connecting plate. The sockets on the opposite sides of every two adjacent square tube bodies form a first sliding space for the connecting plate to slide, and the recessed grooves on the opposite sides of every two adjacent square tube bodies form a second sliding space for the blocking rod to slide. When each of the water-cooled walls is arranged in a line, the first air hole is blocked by the blocking rod.

3. A boiler water wall high temperature corrosion prevention device according to claim 2, characterized in that: The upper and lower ends of the square tube body are fixedly connected with square tube heads, and the end of the square tube head away from the center of the upper water tank is fixedly connected with a baffle. The lower end surface of the upper water tank and the upper end surface of the lower water tank are both provided with guide grooves for the square tube head and the baffle to slide, and the baffle is used to cover the first water outlet and the second water outlet.

4. A boiler water wall high temperature corrosion prevention device according to claim 3, characterized in that: The ventilation mechanism includes a C-shaped plate and a ventilation assembly. The upper and lower ends of the square tube body away from the center of the upper water tank are symmetrically provided with strip through holes. The two ends of the C-shaped plate are slidably connected in the strip through holes. The cross-sections of the two ends of the C-shaped plate are T-shaped. The inner side of the square tube body is provided with plate grooves for plugging the two ends of the C-shaped plate. The C-shaped plate is plugged into the square tube body as the ventilation assembly is extended.

5. A boiler water wall high temperature corrosion prevention device according to claim 4, characterized in that: The ventilation assembly includes an air transfer tube rotatably connected to the middle part of the C-shaped plate, a second air hole opened on the outer side of the air transfer tube, a strip rod symmetrically fixedly connected to the outer side of the air transfer tube, and a plug rotatably connected to the end of the air transfer tube away from the C-shaped plate. The outer side surface of the plug is symmetrically connected with a strip block, and the strip block and the strip rod are connected by magnetic attraction. A matching through hole for slidingly plugging the air transfer tube, the strip rod, the plug and the strip block is opened in the middle of the side of the square tube body away from the center of the upper water tank, and the horizontal length of the plug is at least equal to the depth of the matching through hole.

6. A boiler water wall high temperature corrosion prevention device according to claim 5, characterized in that: The external air source includes an external air duct and a fan for supplying air to the external air duct; A positioning groove is provided at one end of the air transmission pipe away from the plug, a positioning rod which can be inserted into the positioning groove is fixed to the inner side of one end of the external air pipe facing the air transmission pipe, and a locking mechanism for temporarily fixing the external air pipe and the air transmission pipe is provided on the outer side of the air transmission pipe.

7. A boiler water wall high temperature corrosion prevention device according to claim 6, characterized in that: The locking mechanism includes a turning handle rotatably connected to the outer side of the air transmission tube, an L-shaped connecting rod symmetrically fixedly connected to the side of the turning handle facing the external air tube, and a connecting groove opened on the outer side of the L-shaped connecting rod. The end of the L-shaped connecting rod away from the turning handle can slide into the connecting groove, and the air transmission tube and the external air tube are locked by rotating the turning handle.

8. The boiler water wall high temperature corrosion prevention device according to claim 7, characterized in that: A semi-circular rotating groove is formed on the outer side of the air transmission tube, a convex block is slidably connected in the rotating groove, and the convex block is fixedly connected to the inner side of the rotating handle; When each of the water-cooled walls is arranged in a line, the rotating handle is rotated to a horizontal position and fits against the outer side of the grille. When the square tube body moves and the ventilation mechanism penetrates into the square tube body, it is used to connect an external air duct, and when the rotating handle is rotated to a horizontal position, it can be locked on the connecting plate in the middle of the grille.

9. A boiler water wall high temperature corrosion prevention device according to claim 8, characterized in that: The connecting plate in the middle of the grille is symmetrically provided with matching grooves on both sides, the turning handle can be rotated into the matching grooves, round holes are provided at both ends of the turning handle, and a U-shaped plug rod is slidably connected to the connecting plate and inserted into the round holes.

10. A boiler water wall high temperature corrosion prevention device according to claim 9, characterized in that: A rectangular through hole is opened in the middle of the connecting plate in the middle of the grille, a connecting block is fixedly connected to the middle of the U-shaped plug rod in the rectangular through hole, a spring is fixedly connected to the side of the connecting block facing the middle of the U-shaped plug rod, and the end of the spring away from the connecting block is fixedly connected to the connecting plate.

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