A fall pipe structure for circulating fluidized bed slag discharge system

Abstract

The utility model relates to circulating fluidized bed boiler technical field, concretely for a kind of for circulating fluidized bed deslagging system's fall slag pipe structure, including boiler body, the side wall of boiler body is equipped with two poke slag hole, the inside of poke slag hole is provided with plug assembly.The utility model reserves 2 poke slag hole in bottom size head variable diameter section, and is equipped with fire-resistant plug, both dredge when plug slag, can also insulate high temperature, prevent flange red, the surface temperature of the fall slag pipe pipeline of the design can be reduced to 100 ℃ below, basically eliminates the stress crack, carbonization and other problems caused by cold and hot alternation when discharging slag;Pipe lining refractory material not only insulates high temperature, but also plays the effect of anti-abrasion, avoid the direct abrasion of metal parts and high-temperature ash, not only greatly prolongs the service life of pipeline and ensures the long-term reliable operation of equipment, but also greatly reduces the daily maintenance manpower and material resources investment, reduces the security risk in operation.

Description

Technical Field

[0001] This utility model relates to the field of circulating fluidized bed boiler technology, and in particular to a slag discharge pipe structure for a circulating fluidized bed slag discharge system. Background Technology

[0002] As a key component of the furnace ash discharge system, the ash discharge pipe of the bottom cooler in a circulating fluidized bed boiler is responsible for conveying high-temperature ash and slag.

[0003] Traditional ash discharge pipes lack internal refractory materials, leading to serious problems during long-term operation: ash temperatures exceeding 800℃ cause the pipes to frequently glow red-hot; repeated thermal expansion and contraction upon returning to normal temperature after shutdown result in metal carbonization and excessive thermal stress, commonly causing cracking and weld fissures; ash erosion causes new pipes to show significant wear and cracks within two months of use; high-temperature ash leakage poses significant safety risks to on-site equipment and personnel, such as fires and burns; frequent repairs, replacements, and on-site cleanup of ash discharge pipes require substantial manpower and materials, increasing costs.

[0004] Therefore, this utility model provides a slag discharge pipe structure for a circulating fluidized bed slag discharge system. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing slag discharge pipes that cannot meet usage requirements, and to propose a slag discharge pipe structure for circulating fluidized bed slag discharge systems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a slag discharge pipe structure for a circulating fluidized bed slag discharge system, comprising a boiler body, wherein two slag-clearing holes are provided on the side wall of the boiler body, and a plug assembly is provided on the inner side of the slag-clearing holes, wherein the plug assembly includes a plug block slidably installed on the inner side of the slag-clearing holes.

[0007] The effect achieved by the above components is that the matching refractory plugs facilitate the unblocking of slag and also insulate against high temperatures to prevent the flange from turning red.

[0008] Preferably, the plug block has a hollow structure, and three silicone rings are glued to the side wall of the plug block.

[0009] The effect achieved by the above components is that the silicone ring improves the tightness of the plug block when it is inserted into the slag-removing hole.

[0010] Preferably, the plug block has two through holes on its surface inside the silicone ring.

[0011] The effect achieved by the above components is that the through holes facilitate the connection between the silicone rings.

[0012] Preferably, the port of the plug is connected to and fixedly connected to a compression tube, and a baffle is fixedly connected to the end of the compression tube away from the plug.

[0013] The effect achieved by the above components is that the compression tube can expand the position of the silicone ring, which can improve the tightness of the plug when it is inserted into the slag hole for sealing.

[0014] Preferably, the side wall of the baffle is fixedly connected to a first connecting block and a second connecting block, the first connecting block is slidably connected to a limit rod, and the limit rod is fixedly connected to the end side of the plug block.

[0015] The effect achieved by the above components is that the setting of the limit rod restricts the direction of movement of the baffle.

[0016] Preferably, the second connecting block has an internal threaded connection to a drive rod, and the drive rod is rotatably connected to the plug block.

[0017] The effect achieved by the above components is that rotating the drive rod can drive the baffle.

[0018] In summary:

[0019] In this utility model, the improved high-temperature resistance and wear resistance are achieved by optimizing the material, structure, and inner lining design of the slag discharge pipe. The core principles are as follows: Fire protection: A 100mm thick refractory material is attached to the inner wall of the slag discharge pipe and fixed by welded claw studs to form an effective heat insulation layer, reducing the pipe wall temperature and preventing high-temperature red-hot burning and metal carbonization; Material optimization: After attaching the refractory material to the inner wall, the outer layer can be made of Q345 steel instead of the original 310s stainless steel, which has the advantages of easy processing, easy forming, and low price; Anti-clogging design: Two slag removal holes are reserved at the bottom reducing section. The pipe is equipped with refractory plugs, which facilitate slag removal during slag discharge and insulate against high temperatures to prevent flanges from overheating. The outer surface temperature of the slag discharge pipe can be reduced to below 100℃, effectively eliminating problems such as stress cracking and carbonization caused by alternating hot and cold temperatures during slag discharge. The refractory lining inside the pipe not only insulates against high temperatures but also provides wear protection, preventing direct wear between metal parts and high-temperature ash. This not only greatly extends the service life of the pipeline and ensures long-term reliable operation of the equipment but also significantly reduces the manpower and material resources required for daily maintenance, thus lowering safety risks during operation. 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 structure of the plug assembly in this utility model;

[0022] Figure 3 In this utility model Figure 2 A partial structural diagram.

[0023] Legend: 1. Boiler body; 2. Slag removal hole; 3. Plug assembly; 31. Plug block; 32. Compression pipe; 33. Silicone ring; 34. Through hole; 35. Baffle; 36. First connecting block; 37. Second connecting block; 38. Limiting rod; 39. Drive rod. Detailed Implementation

[0024] Reference Figure 1 As shown, this utility model provides a technical solution: a slag discharge pipe structure for a circulating fluidized bed slag discharge system, including a boiler body 1.

[0025] The following is a detailed explanation of its overall setup and function.

[0026] In this implementation scheme: two slag-clearing holes 2 are opened on the side wall of the boiler body 1. A plug assembly 3 is provided on the inner side of the slag-clearing hole 2. The plug assembly 3 includes a plug block 31 that is slidably installed on the inner side of the slag-clearing hole 2. The plug is made of refractory material, which facilitates slag clearing and can also insulate against high temperature to prevent the flange from red-hot.

[0027] Specifically, the plug block 31 has a hollow structure, and three silicone rings 33 are glued to its side wall. The silicone rings 33 improve the tightness of the plug block 31 when it is inserted into the slag-removing hole 2. Two through holes 34 are formed on the surface of the plug block 31 located inside the silicone rings 33. The through holes 34 facilitate communication between the silicone rings 33. A compression tube 32 is connected and fixedly connected to the end of the plug block 31, and a baffle 35 is fixedly connected to the end of the compression tube 32 away from the plug block 31. Squeezing the compression tube 32 can expand the silicone rings 33, which can improve the tightness of the plug when it is inserted into the slag-removing hole 2. A first connecting block 36 and a second connecting block 37 are fixedly connected to the side wall of the baffle 35. A limit rod 38 is slidably connected inside the first connecting block 36, and the limit rod 38 is fixedly connected to the end side of the plug block 31. The limit rod 38 restricts the movement direction of the baffle 35. The second connecting block 37 has an internal threaded connection to a drive rod 39, which is internally rotatably connected to the plug block 31. Rotating the drive rod 39 drives the baffle 35.

[0028] Working principle: By optimizing the material, structure, and lining design of the slag discharge pipe, the high-temperature resistance and wear resistance are improved. The core principles are as follows: Fire protection: A 100mm thick refractory material is attached to the inner wall of the slag discharge pipe and fixed by welded claw studs to form an effective heat insulation layer, reducing the pipe wall temperature and preventing high-temperature red-hot burning and metal carbonization; Material optimization: After attaching the refractory material to the inner wall, the outer layer can use Q345 steel instead of the original 310s stainless steel, which has the advantages of easy processing, easy forming, and low price; Anti-clogging design: Two slag removal holes are reserved at the bottom reducing section. The pipe is equipped with refractory plugs, which facilitate slag removal during slag discharge and insulate against high temperatures to prevent flanges from overheating. The outer surface temperature of the slag discharge pipe can be reduced to below 100℃, effectively eliminating problems such as stress cracking and carbonization caused by alternating hot and cold temperatures during slag discharge. The refractory lining inside the pipe not only insulates against high temperatures but also provides wear protection, preventing direct wear between metal parts and high-temperature ash. This not only greatly extends the service life of the pipeline and ensures long-term reliable operation of the equipment but also significantly reduces the manpower and material resources required for daily maintenance, thus lowering safety risks during operation.

[0029] When the plug block 31 of the plug assembly 3 is embedded inside the slag-clearing hole 2, the three silicone rings 33 bonded to its sidewalls tightly fit against the inner wall of the slag-clearing hole 2, forming multiple sealing lines to prevent high-temperature ash from leaking from the slag-clearing hole 2. Simultaneously, the plug block 31 has a hollow structure, and two through holes 34 are opened on the surface inside the silicone rings 33, allowing air communication between the silicone rings 33. Combined with the compression tube 32 connected to the port of the plug block 31, squeezing the compression tube 32 pushes air onto the silicone rings 33, causing the silicone rings 33 to further expand, enhancing the fit with the inner wall of the slag-clearing hole 2, improving the sealing tightness, and preventing heat transfer from gaps to the surrounding area of ​​the slag-clearing hole 2. When the flange is heated to red-hot, and ash and slag blockage occurs in the slag discharge pipe, the drive rod 39 inside the second connecting block 37 is rotated, and the threaded transmission drives the second connecting block 37 to move the baffle 35. At this time, the limiting rod 38, which is slidably connected inside the first connecting block 36 on the side wall of the baffle 35, restricts the baffle 35 to move only in a straight line, ensuring that the plug block 31 slides outward smoothly, opening the slag removal hole 2. The operator can then insert tools through the slag removal hole 2 to clean the blockage ash and slag. After the slag removal is completed, the drive rod 39 is rotated in the opposite direction to reset the plug block 31 and reseal the slag removal hole 2. The whole process does not require disassembling a large number of parts, making the operation convenient and efficient, and reducing downtime for slag removal.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A slag discharge pipe structure for a circulating fluidized bed slag discharge system, comprising a boiler body (1), characterized in that: The boiler body (1) has two slag-clearing holes (2) on its side wall. A plug assembly (3) is provided inside the slag-clearing holes (2). The plug assembly (3) includes a plug block (31) that is slidably installed inside the slag-clearing holes (2). The plug block (31) has a hollow structure. Three silicone rings (33) are glued to the side wall of the plug block (31). Two through holes (34) are opened on the surface of the plug block (31) inside the silicone rings (33). The port of the plug block (31) is connected to and fixedly connected to a compression pipe. (32) A baffle (35) is fixedly connected to one end of the compression tube (32) away from the plug block (31). A first connecting block (36) and a second connecting block (37) are fixedly connected to the side wall of the baffle (35). A limit rod (38) is slidably connected inside the first connecting block (36). The limit rod (38) is fixedly connected to the end side of the plug block (31). A drive rod (39) is threadedly connected inside the second connecting block (37). The drive rod (39) is rotatably connected to the inside of the plug block (31).

Images