Wall-attached air device for preventing high-temperature corrosion of water-cooled wall of coal-fired boiler

Abstract

The invention relates to a near-wall air device for preventing high-temperature corrosion of a water cooling wall of a coal-fired boiler, the near-wall air device comprises an air supply pipeline and a near-wall air assembly mounted on the air supply pipeline, and the near-wall air assembly comprises a mounting shell, an insertion barrel inserted into the mounting shell, a guide plate elastically arranged in the insertion barrel and a plurality of limiting assemblies; a step is arranged at the upper end of the interior of the mounting shell so that the inserting barrel can move upwards for limiting, the flow guide plate is used for guiding airflow and can move up and down along the inserting barrel so that the air pressure value of the inserting barrel can be larger than or equal to the rated air pressure value, and the inserting barrel is provided with a control assembly which is used for controlling the limiting assembly to reset; the device has the advantage of being convenient to disassemble and assemble.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a wall-attached wind device for preventing high-temperature corrosion of a water-cooled wall of a coal-fired boiler. Background Art

[0002] High temperature corrosion of coal-fired boilers usually occurs on both sides of the furnace wall. In order to solve the high temperature corrosion, power plants usually take measures such as corrosion tube replacement, anti-corrosion metal spraying, special adjustment of combustion equipment and wall wind modification. The more commonly used and effective method is wall wind modification, which uses wall wind nozzles installed on both sides of the wall to make a layer of air flow near the water-cooled wall on both sides, reducing the influence of high temperature near the water-cooled wall, the scouring of coal powder and the formation of reducing atmosphere, and alleviating high temperature corrosion and wear of the water-cooled wall.

[0003] In the prior art, when installing a wall-mounted wind device, it is necessary to drill a hole in the water-cooled wall according to the installation position of the wall-mounted wind device, and then connect it through welding or flanges to ensure a firm installation and good sealing. However, the connection method of welding or flanges makes it inconvenient to remove the wall-mounted wind device when it is damaged, further increasing the time required for maintenance. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a wall-attached wind device which is easy to disassemble and assemble and can prevent high-temperature corrosion of the water-cooled wall of a coal-fired boiler.

[0005] The technical solution of the present invention is as follows:

[0006] A wall-attached wind device for preventing high-temperature corrosion of a water-cooled wall of a coal-fired boiler comprises an air supply pipeline and a wall-attached wind component installed on the air supply pipeline, wherein the wall-attached wind component comprises a mounting shell, a plug-in tube plugged into the mounting shell, a guide plate elastically arranged in the plug-in tube, and a plurality of limiter components;

[0007] A step is provided at the upper end of the interior of the mounting shell to limit the upward displacement of the plug-in tube;

[0008] The guide plate is used to guide the airflow, and the guide plate can move up and down along the plug-in tube so that the air pressure value of the plug-in tube is greater than or equal to the rated air pressure value;

[0009] The limit assembly is arranged on the plug-in barrel and is plugged into the mounting shell when the plug-in barrel moves upward to a limit position, so that the plug-in barrel moves downward to a limit position. At this time, the limit assembly can be no longer plugged into the mounting shell as the plug-in barrel rotates. When the limit assembly is plugged into the mounting shell and the plug-in barrel heats up, the depth of the limit assembly inserted into the mounting shell gradually deepens as the temperature of the plug-in barrel increases, so that the limit assembly cannot rotate out of the mounting shell.

[0010] The plug-in cylinder is provided with a control assembly, and the control assembly is used to control the resetting of the limit assembly so that the limit assembly can be no longer plugged into the installation shell as the plug-in cylinder rotates.

[0011] Furthermore, a gas storage cavity is provided in a ring shape on the side wall of the plug-in tube, the gas storage cavity is connected to the limit assembly, a one-way valve connected to the plug-in tube is provided inside the gas storage cavity, and the opening air pressure of the one-way valve is the rated air pressure value.

[0012] Furthermore, the limit assembly includes a guide cylinder fixed on the plug-in cylinder, a plug-in rod sealed and plugged on the guide cylinder, and an extrusion spring connected to the plug-in rod, the guide cylinder is connected to the air storage cavity to drive the plug-in rod to move, and the guide cylinder is tilted downward toward one end of the mounting shell;

[0013] One end of the plug-in rod away from the guide cylinder is conical and has a circular chamfer at the end. The circular chamfer of the plug-in rod is plugged into the mounting shell.

[0014] Furthermore, the mounting shell is provided with an inclined hole for the plug-in rod to be inserted, and a tapered channel is provided on one side of the inclined hole along the circumferential direction of the mounting shell, and the width of the tapered channel gradually decreases from the side connected to the inclined hole to the side away from the inclined hole.

[0015] Furthermore, the openings at the upper and lower ends of the plug-in tube are both circular, and the lower side surface of the guide plate can be in contact and closed with the opening at the upper end of the plug-in tube. A guide rod is provided at the lower end of the guide plate, and the guide rod is inserted into the plug-in tube. The plug-in tube is rotatably connected to a plurality of spring telescopic rods rotatably connected to the guide rod. The plug-in tube is fixed with a limiting telescopic rod connected to the air storage chamber, and the limiting telescopic rod is provided with a cylinder, and the guide rod is inserted into the cylinder, and when gas enters the air storage chamber, the limiting telescopic rod extends and limits the guide rod.

[0016] Furthermore, the position-limiting telescopic rod comprises a connecting tube, a fixing tube fixed on the plug-in tube, a rod body sealed and plugged into the fixing tube, and a locking spring arranged between the rod body and the fixing tube, wherein the locking spring is used to drive the rod body away from the guide rod;

[0017] The rod body passes through the fixed tube and contacts the guide rod, so that the guide rod is limited in displacement up and down, and the other end of the fixed tube is fixed on the cylinder;

[0018] The connecting cylinder is fixed on the plug-in cylinder and connected with the air storage cavity. The fixed cylinder is located in the connecting cylinder. The connecting cylinder is sealed and fixed to the cylinder. An air inlet hole is opened at one end of the fixed cylinder away from the cylinder.

[0019] Furthermore, the cylinder is provided with a plurality of slide grooves along the up-down direction, the guide rod is provided with a tooth plate located in the slide groove, the cylinder is slidably connected with a limit plate meshed with the tooth plate, and the limit plate is connected to the rod body.

[0020] Furthermore, the interior of the plug-in tube is divided into a purge portion, a pressurizing portion and an inlet port at the top and bottom, and the diameters of the purge portion and the pressurizing portion are both smaller than the diameter of the inlet port.

[0021] Furthermore, the control component includes an exhaust channel opened at the bottom of the plug-in tube, an exhaust hole connected to the exhaust channel, and a seal detachably sealed in the exhaust hole, and the exhaust channel is connected to the air storage chamber.

[0022] Furthermore, the air supply pipeline includes a plurality of delivery cylinders, a delivery pipe connecting the plurality of delivery cylinders, a connecting pipe connecting with the delivery pipes, and an air inlet connecting with the delivery cylinders, wherein the connecting pipe is connected with the air inlet.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention realizes the limiting of the plug-in tube by setting the limiting assembly and the step, ensures the fixation of the plug-in tube and the mounting shell, and realizes the resetting of the limiting assembly by setting the control assembly, and realizes the disassembly of the plug-in tube by rotating the plug-in tube, thereby realizing the detachable connection of the plug-in tube;

[0025] 2. The present invention adopts the arrangement of the air storage chamber and the one-way valve to prevent the air in the air storage chamber from being discharged, and to expand the air in the air storage chamber when the boiler is heated, so that the limit assembly can be completely inserted into the installation shell, ensuring the fixation of the plug-in tube and avoiding the situation of falling due to careless collision by personnel.

[0026] In short, the present invention has the advantage of being easy to disassemble and assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention when it is installed;

[0028] Figure 2 For the present invention Figure 1 A schematic diagram of the structure of the wall-attached wind component;

[0029] Figure 3 For the present invention Figure 2 A schematic cross-sectional structure diagram of ;

[0030] Figure 4 For the present invention Figure 2 A cross-sectional schematic diagram of a mounting shell;

[0031] Figure 5 For the present invention Figure 3 A schematic diagram of the enlarged structure of part A;

[0032] Figure 6 For the present invention Figure 2 A schematic diagram of a top view structure;

[0033] Figure 7 For the present invention Figure 3 Schematic diagram of the structure of the limiting telescopic rod part.

[0034] In the figure, 1, air inlet, 2, connecting pipe, 3, conveying pipe, 4, furnace, 5, wall-attached wind assembly, 51, mounting shell, 511, inclined hole, 512, step, 513, tapered channel, 52, sealing member, 53, plug-in cylinder, 54, guide plate, 55, air storage cavity, 56, one-way valve, 57, inlet, 58, limit telescopic rod, 581, locking spring, 582, rod body, 583, fixing cylinder, 584. Air inlet hole, 585. Limit plate, 586. Connecting cylinder, 59. Cooling hole, 50. Cylinder, 501. Spring telescopic rod, 502. Guide rod, 5021. Tooth plate, 503. Exhaust channel, 504. Limit assembly, 5041. Extrusion spring, 5042. Guide cylinder, 5043. Connecting rod, 505. Support rod, 506. Pressurizing part, 507. Purge part, 6. Conveying cylinder. DETAILED DESCRIPTION

[0035] 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.

[0036] like Figure 1-7 As shown, the wall-attached wind device for preventing high-temperature corrosion of the water-cooled wall of a coal-fired boiler comprises an air supply pipeline and a wall-attached wind component 5 installed on the air supply pipeline, wherein the wall-attached wind component 5 comprises a mounting shell 51, a plug-in tube 53 plugged into the mounting shell 51, a guide plate 54 elastically arranged in the plug-in tube 53, and a plurality of limiter components 504;

[0037] A step 512 is provided at the upper end of the mounting shell 51 to limit the upward displacement of the plug-in tube 53;

[0038] The guide plate 54 is used to guide the airflow. The guide plate 54 can move up and down along the plug-in tube 53 so that the air pressure value of the plug-in tube 53 is greater than or equal to the rated air pressure;

[0039] The limiting assembly 504 is arranged on the plug-in barrel 53 and is plugged into the mounting shell 51 when the plug-in barrel 53 moves upward to a limited position, so that the plug-in barrel 53 moves downward to a limited position. At this time, the limiting assembly 504 can be no longer plugged into the mounting shell 51 as the plug-in barrel 53 rotates. When the limiting assembly 504 is plugged into the mounting shell 51 and the plug-in barrel 53 heats up, the depth of the limiting assembly 504 inserted into the mounting shell 51 gradually deepens as the temperature of the plug-in barrel 53 increases, so that the limiting assembly 504 cannot rotate out of the mounting shell 51.

[0040] The plug-in cylinder 53 is provided with a control component, which is used to control the position limiting component 504 to reset, so that the position limiting component 504 can rotate with the plug-in cylinder 53 and no longer be plugged into the installation shell 51;

[0041] When in use, a hole for installing the mounting shell 51 is opened on the furnace 4, and then the mounting shell 51 is installed in the mounting hole, and then the air supply pipeline is connected to the external air supply equipment, and then the external air supply equipment is operated, and the air enters the plug-in tube 53 through the air supply pipeline, and then the air pressure in the plug-in tube 53 increases, and the guide plate 54 is pushed upward, and the air flow sweeps the furnace 4 to form an air film to prevent high-temperature corrosion of the water-cooled wall in the boiler;

[0042] During use, as the temperature in the furnace 4 increases, the temperature of the plug-in tube 53 gradually increases, and the limiting component 504 gradually extends into the mounting shell 51, so that the plug-in tube 53 cannot be separated from the mounting shell 51;

[0043] When it is necessary to remove the plug-in tube 53, wait for it to cool down, and then control the limit assembly 504 to reset through the control assembly. Then, rotate the plug-in tube 53 to make the limit assembly 504 detach from the mounting shell 51, and then remove the plug-in tube 53. When it is necessary to install, just plug the plug-in tube 53 into the mounting shell 51 and rotate the plug-in tube 53 to make the limit assembly 504 insert into the mounting shell 51.

[0044] In this embodiment, if Figure 3 As shown, the side wall of the plug-in cylinder 53 is provided with an annular air storage cavity 55, the air storage cavity 55 is connected to the limit assembly 504, a one-way valve 56 connected to the plug-in cylinder 53 is arranged inside the air storage cavity 55, the opening air pressure of the one-way valve 56 is the rated air pressure value, and a plurality of support rods 505 are arranged inside the air storage cavity 55;

[0045] After the plug-in tube 53 enters the gas and the guide plate 54 moves upward, under the action of the guide plate 54, the air pressure in the plug-in tube 53 can rise to the point where the one-way valve 56 opens. At this time, gas enters the gas storage chamber 55, but the limit assembly 504 will not continue to be inserted into the mounting shell 51 as the gas enters. As the temperature in the furnace 4 increases, the air pressure in the gas storage chamber 55 gradually increases with the temperature, so that the limit assembly 504 continues to be inserted into the mounting shell 51. At this time, the plug-in tube 53 cannot be removed from the mounting shell 51, so as to avoid personnel accidentally removing the plug-in tube 53 when the temperature in the furnace 4 is high, thereby ensuring safety.

[0046] It should be noted that the size of the gas storage space of the gas storage cavity 55 is determined according to the maximum value of the temperature rise of the furnace 4, so as to ensure that after the air temperature rises, the pressure in the gas storage space of the gas storage cavity 55 can drive the limit assembly 504 to work;

[0047] Among them, in the prior art, at normal temperature and pressure, the thermal expansion coefficient of air is about 0.00367 / °C;

[0048] Among them, since the temperature of the boiler is relatively high, when in use, the one-way valve 56 can be made of one-way valves 56 of different materials, such as tungsten-molybdenum alloy one-way valve 56, ceramic one-way valve 56, etc.

[0049] In this embodiment, if Figure 3 , 5 As shown, the limiting assembly 504 includes a guide cylinder 5042 fixed on the plug cylinder 53, a plug rod 5043 sealed and plugged on the guide cylinder 5042, and an extrusion spring 5041 connected to the plug rod 5043. The guide cylinder 5042 is connected to the air storage chamber 55 to drive the plug rod 5043 to move. The guide cylinder 5042 is tilted downward toward one end of the mounting shell 51.

[0050] One end of the plug rod 5043 away from the guide cylinder 5042 is conical and has a circular chamfer at the end. The circular chamfer of the plug rod 5043 is plugged into the mounting shell 51.

[0051] The plug-in connection between the plug-in rod 5043 and the guide cylinder 5042 can be sealed by using a tungsten-molybdenum alloy sealing ring, a ceramic sealing member 52, or a silicon carbide sealing ring of the ceramic sealing member 52 in the prior art;

[0052] The extrusion spring 5041 is specifically a nickel-based high-temperature alloy spring, and other springs that can be used in a boiler high-temperature environment may also be used;

[0053] When the plug-in cylinder 53 is inserted into the mounting shell 51, since the plug-in rod 5043 is arranged at an angle, the plug-in rod 5043 will gradually shrink into the guide cylinder 5042 during insertion and squeeze the squeezing spring 5041. When the plug-in cylinder 53 is fully inserted, the squeezing spring 5041 pushes the plug-in rod 5043 to return to its original position and insert it into the mounting shell 51.

[0054] When the air pressure in the air storage chamber 55 increases, the gas in the air storage chamber 55 enters the guide tube 5042 and pushes the plug rod 5043 to move, so as to increase the insertion depth of the plug rod 5043 into the installation shell 51.

[0055] In this embodiment, if Figure 3 , 4 As shown, the mounting shell 51 is provided with an inclined hole 511 for the plug-in rod 5043 to be plugged in, and a tapered channel 513 is provided on one side of the inclined hole 511 along the circumferential direction of the mounting shell 51, and the width of the tapered channel 513 gradually decreases from the side connected with the inclined hole 511 to the side away from the inclined hole 511, and the depth gradually decreases until it is flush with the inner wall of the mounting shell 51, wherein the connection point between the tapered channel 513 and the inclined hole 511 is located above the inclined hole 511, so that when the circular chamfer of the plug-in rod 5043 is located at the bottom of the inclined hole 511, the plug-in rod 5043 cannot enter the tapered channel 513;

[0056] When in use, the plug-in rod 5043 is inserted into the inclined hole 511. At this time, the plug-in rod 5043 can move along the tapered channel 513 when the plug-in tube 53 rotates, and gradually shrink into the guide tube 5042 until the plug-in rod 5043 hits the inner wall of the mounting shell 51. At this time, the plug-in tube 53 can be taken out. When the plug-in rod 5043 is inserted into the inclined hole 511 and the air pressure in the air storage chamber 55 increases, the plug-in rod 5043 continues to move toward the bottom of the inclined hole 511 until it is completely inserted into the inclined hole 511. At this time, the plug-in rod 5043 cannot be separated from the inclined hole 511, thereby preventing the plug-in tube 53 from being separated from the mounting shell 51.

[0057] In this embodiment, if Figure 2 , 3 As shown, the upper and lower openings of the plug-in cylinder 53 are both circular, the lower side of the guide plate 54 can be in contact with the upper opening of the plug-in cylinder 53 and closed, the lower end of the guide plate 54 is integrally formed with a guide rod 502, the guide rod 502 is arranged in the plug-in cylinder 53, the plug-in cylinder 53 is rotatably connected with a plurality of spring telescopic rods 501 rotatably connected with the guide rod 502, the plug-in cylinder 53 is fixed with a limiting telescopic rod 58 connected with the gas storage chamber 55, the limiting telescopic rod 58 is fixed with a cylinder 50, the guide rod 502 is plugged in the cylinder 50, and when the gas enters the gas storage chamber 55, the limiting telescopic rod 58 extends and limits the guide rod 502;

[0058] The guide rod 502 is vertically provided with a cooling hole 59 . When the gas flows, part of the gas flows out from the cooling hole 59 to cool the guide plate 54 .

[0059] When the gas enters the plug-in tube 53, the air pressure in the plug-in tube 53 rises until the air pressure in the plug-in tube 53 is equal to or greater than the rated air pressure value, the guide plate 54 moves upward and drives the guide rod 502 to move upward along the cylinder 50, the guide rod 502 drives the spring telescopic rod 501 to extend and rotate upward, and the airflow flows out through the guide plate 54;

[0060] After the guide plate 54 moves upward, the air pressure in the air storage chamber 55 gradually increases, causing the limiting telescopic rod 58 to extend, and the limiting telescopic rod 58 extends and limits the guide rod 502. At this time, the position of the guide plate 54 is fixed to ensure the diversion.

[0061] The spring telescopic rod 501 can be made of high temperature resistant materials, such as nickel-based high temperature alloy, cobalt-based high temperature alloy and silicon carbide ceramics;

[0062] In this embodiment, if Figure 3 , 7 As shown, the position-limiting telescopic rod 58 includes a connecting tube 586, a fixing tube 583 fixed on the plug-in tube 53, a rod body 582 sealed and plugged in the fixing tube 583, and a locking spring 581 disposed between the rod body 582 and the fixing tube 583, and the locking spring 581 is used to drive the rod body 582 away from the guide rod 502;

[0063] The rod body 582 passes through the fixed cylinder 583 and contacts the guide rod 502, so that the guide rod 502 can be limited in displacement up and down. The other end of the fixed cylinder 583 is fixed on the cylinder 50.

[0064] The connecting tube 586 is fixed on the plug-in tube 53 and communicates with the air storage chamber 55. The fixed tube 583 is located in the connecting tube 586. The connecting tube 586 is sealed and fixed to the cylinder 50. An air inlet hole 584 is opened at one end of the fixed tube 583 away from the cylinder 50.

[0065] The locking spring 581 and the sealing plug can be made of the same material as the extrusion spring 5041 and the plug rod 5043;

[0066] When in use, the gas in the air storage chamber 55 enters the connecting tube 586 and enters the fixed tube 583 through the connecting tube 586. The fixed tube 583 pushes the rod body 582 to move and abuts against the guide rod 502 to limit the displacement of the guide rod 502. When the air pressure in the air storage chamber 55 decreases, the locking spring 581 pushes the rod body 582 to return to its original position, and the guide rod 502 is released from the limit.

[0067] In this embodiment, if Figure 7As shown, the cylinder 50 is provided with a plurality of slide grooves in the vertical direction, the guide rod 502 is provided with a tooth plate 5021 located in the slide groove, the cylinder 50 is slidably connected with a limit plate 585 meshing with the tooth plate 5021, and the limit plate 585 is connected to the rod body 582;

[0068] When in use, the displacement limitation of the guide rod 502 is achieved through the engagement of the tooth plate 5021 with the limiting plate 585 to ensure the limitation.

[0069] In this embodiment, if Figure 3 As shown, the interior of the plug-in tube 53 is divided into a purge portion 507, a pressurizing portion 506 and an inlet 57 from top to bottom, and the diameters of the purge portion 507 and the pressurizing portion 506 are both smaller than the diameter of the inlet 57;

[0070] When in use, the connection with the air supply pipeline is achieved through the inlet 57, and the pressure of the exhaust gas is increased through the pressurizing part 506 and the purging part 507 to ensure the purging range.

[0071] In this embodiment, if Figure 3 As shown, the control assembly includes an exhaust channel 503 opened at the bottom of the plug-in tube 53, an exhaust hole connected to the exhaust channel 503, and a sealing member 52 detachably sealed and connected in the exhaust hole, and the exhaust channel 503 is connected to the air storage chamber 55;

[0072] The removable sealing member 52 specifically includes a bolt and a sealing gasket, wherein the sealing gasket is made of a high-temperature sealing material to achieve sealing in a high-temperature environment during boiler combustion. Other existing removable sealing members 52 may also be used;

[0073] When pressure relief is required, the sealing member 52 can be removed.

[0074] In this embodiment, if Figure 1 As shown, the air supply pipeline includes a plurality of delivery cylinders 6, a delivery pipe 3 connected to the plurality of delivery cylinders 6, a connecting pipe 2 connected to the delivery pipe 3, and an air inlet 1 connected to the delivery cylinder 6, and the connecting pipe 2 is connected to the inlet 57;

[0075] When in use, the gas inlet 1 is used to connect to an external gas supply device, and the gas is delivered through the delivery cylinder 6 , the delivery pipe 3 and the connecting pipe 2 .

[0076] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wall-attached air device for preventing high-temperature corrosion of a water-cooled wall of a coal-fired boiler, comprising an air supply pipeline and a wall-attached air component installed on the air supply pipeline, characterized in that: The wall-mounted wind assembly includes a mounting shell, a plug-in tube plugged into the mounting shell, a guide plate elastically arranged in the plug-in tube, and a plurality of limit assemblies; A step is provided at the upper end of the interior of the mounting shell to limit the upward displacement of the plug-in tube; The guide plate is used to guide the air flow, and the guide plate can move up and down along the plug-in tube so that the air pressure value of the plug-in tube is greater than or equal to the rated air pressure value; The limiting assembly is provided on the plug-in barrel and is plugged into the mounting shell when the plug-in barrel moves upward to a limited position, so that the plug-in barrel moves downward to a limited position. At this time, the limiting assembly can no longer be plugged into the mounting shell as the plug-in barrel rotates. When the limiting assembly is plugged into the mounting shell and the plug-in barrel heats up, the depth of the limiting assembly inserted into the mounting shell gradually deepens as the temperature of the plug-in barrel increases, so that the limiting assembly cannot rotate out of the mounting shell. The plug-in cylinder is provided with a control component, and the control component is used to control the resetting of the limiting component so that the limiting component can no longer be plugged into the mounting shell as the plug-in cylinder rotates.

2. The wall-attached air device for preventing high-temperature corrosion of the water-cooled wall of a coal-fired boiler according to claim 1 is characterized in that: The side wall of the plug-in cylinder is provided with an annular air storage cavity, which is connected to the limit assembly. A one-way valve connected to the plug-in cylinder is provided inside the air storage cavity, and the opening pressure of the one-way valve is the rated air pressure value.

3. The wall-mounted wind device for preventing high-temperature corrosion of the water-cooled wall of a coal-fired boiler according to claim 2 is characterized in that: The limiting assembly includes a guide cylinder fixed to the plug-in cylinder, a plug-in rod sealed and plugged into the guide cylinder, and an extrusion spring connected to the plug-in rod. The guide cylinder is connected to the air storage chamber to drive the plug-in rod to move. The guide cylinder is tilted downward toward one end of the mounting shell. One end of the plug-in rod away from the guide cylinder is conical and is provided with a circular chamfer at the end. The circular chamfer of the plug-in rod is plugged into the mounting shell.

4. The wall-attached air device for preventing high-temperature corrosion of the water-cooled wall of a coal-fired boiler according to claim 3 is characterized in that: The mounting shell is provided with an inclined hole for the plug-in rod to be inserted, and a tapered channel is provided on one side of the inclined hole along the circumferential direction of the mounting shell. The width of the tapered channel gradually decreases from the side connected to the inclined hole to the side away from the inclined hole.

5. The wall-attached air device for preventing high-temperature corrosion of the water-cooled wall of a coal-fired boiler according to claim 2 is characterized in that: The upper and lower openings of the plug-in tube are both circular, and the lower side surface of the guide plate can be in contact and closed with the upper opening of the plug-in tube. A guide rod is provided at the lower end of the guide plate, and the guide rod is passed through the plug-in tube. The plug-in tube is rotatably connected to a plurality of spring telescopic rods rotatably connected to the guide rod. The plug-in tube is fixed with a limiting telescopic rod connected to the air storage chamber, and the limiting telescopic rod is provided with a cylinder, and the guide rod is inserted in the cylinder, and when gas enters the air storage chamber, the limiting telescopic rod extends and limits the guide rod.

6. The wall-attached air device for preventing high-temperature corrosion of the water-cooled wall of a coal-fired boiler according to claim 5 is characterized in that: The position-limiting telescopic rod includes a connecting tube, a fixing tube fixed on the plug-in tube, a rod body sealed and inserted in the fixing tube, and a locking spring provided between the rod body and the fixing tube, wherein the locking spring is used to drive the rod body away from the guide rod; The rod body passes through the fixed cylinder and contacts the guide rod so that the guide rod is limited in its upward and downward displacement. The other end of the fixed cylinder is fixed on the cylinder. The connecting cylinder is fixed on the plug-in cylinder and is connected with the air storage cavity. The fixed cylinder is located in the connecting cylinder. The connecting cylinder is sealed and fixed to the cylinder. An air inlet hole is opened at one end of the fixed cylinder away from the cylinder.

7. The wall-attached air device for preventing high-temperature corrosion of the water-cooled wall of a coal-fired boiler according to claim 6 is characterized in that: The cylinder is provided with a plurality of sliding grooves along the up-down direction, the guide rod is provided with a tooth plate located in the sliding groove, the cylinder is slidably connected with a limit plate engaged with the tooth plate, and the limit plate is connected to the rod body.

8. The wall-attached air device for preventing high-temperature corrosion of the water-cooled wall of a coal-fired boiler according to claim 1 is characterized in that: The interior of the plug-in cylinder is divided into a purge portion, a pressurizing portion and an inlet port in the upper and lower parts, and the diameters of the purge portion and the pressurizing portion are both smaller than the diameter of the inlet port.

9. The wall-attached air device for preventing high-temperature corrosion of the water-cooled wall of a coal-fired boiler according to claim 2, characterized in that: The control component includes an exhaust channel opened at the bottom of the plug-in cylinder, an exhaust hole connected to the exhaust channel, and a sealing member detachably and sealedly connected in the exhaust hole. The exhaust channel is connected to the air storage cavity.

10. The wall-attached air device for preventing high-temperature corrosion of the water-cooled wall of a coal-fired boiler according to claim 8, characterized in that: The air supply pipeline includes a plurality of delivery cylinders, a delivery pipe communicating with the plurality of delivery cylinders, a connecting pipe communicating with the delivery pipe, and an air inlet communicating with the delivery cylinders, wherein the connecting pipe is connected with the inlet.

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