Socket type high temperature expansion joint for boiler slagging pipe

Abstract

The utility model relates to the technical field of circulating fluidized bed boiler auxiliary equipment, specifically discloses a socket type high temperature expansion joint for boiler slag discharge pipeline, including the upper socket section of installing on the upper end of slag discharge pipe and the lower socket section of installing in the lower end of slag discharge pipe, the upper socket section is connected with the lower socket section sliding, and the annular cavity is formed between the upper socket section and the lower socket section, the annular cavity is filled with high temperature resistant sealing filler, and a filler compression ring is arranged on the upper socket section, the filler compression ring is installed below the high temperature resistant sealing filler and is used for compacting and adjusting the sealing pre-tightening force of high temperature resistant sealing filler. First, in the use, socket type sliding structure can effectively absorb the axial thermal expansion displacement of slag discharge pipe, releases the pipeline thermal stress. Adopt high temperature resistant sealing filler, and through the compression ring continuous pressure tightness, ensure that under the high temperature and pressure fluctuation environment, long -term sealing to ash slag medium, solved the leakage problem.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary equipment for circulating fluidized bed boilers, specifically a socket-type high-temperature expansion joint for boiler slag discharge pipes. Background Technology

[0002] During operation, the ash discharge pipes of circulating fluidized bed boilers are constantly subjected to the scouring environment of high-temperature ash and slag, resulting in drastic temperature changes in the pipe walls and significant axial thermal expansion displacement. Traditional compensation methods, such as the use of metal bellows expansion joints, are prone to problems such as bellows wear and perforation, fatigue cracking, and other issues under harsh conditions of high temperature and high abrasion, leading to a short service life. Meanwhile, some sliding expansion joints are susceptible to jamming due to the intrusion of fine ash and slag leaking from the boiler's air chamber into the moving gaps, causing loss of compensation capability and ultimately leading to stress concentration in the pipelines, seal leaks, and even equipment damage, seriously threatening the safe and stable operation of the boiler.

[0003] Therefore, there is an urgent need for a special expansion joint that can adapt to the special working conditions of the slag discharge pipe of a circulating fluidized bed boiler, and has high temperature compensation capability, excellent sealing performance and anti-jamming performance. Utility Model Content

[0004] The purpose of this invention is to provide a socket-type high-temperature expansion joint for boiler slag discharge pipes, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a socket-type high-temperature expansion joint for boiler ash discharge pipes, comprising an upper socket section installed at the upper end of the ash discharge pipe and a lower socket section installed at the lower end of the ash discharge pipe, wherein the upper socket section and the lower socket section are slidably connected, and an annular cavity is formed between the upper socket section and the lower socket section; the annular cavity is filled with high-temperature resistant sealing filler, and a filler pressure ring is provided on the upper socket section, wherein the filler pressure ring is installed below the high-temperature resistant sealing filler and is used to compress and adjust the sealing preload of the high-temperature resistant sealing filler.

[0006] Furthermore, the packing ring is installed on one side of the upper bearing section by fasteners.

[0007] Furthermore, the fastener includes a bolt mounted on the packing ring, and also includes a nut, which is threadedly connected to the upper bearing section after the bolt passes through it.

[0008] Furthermore, the insertion end of the upper support segment is provided with a guide chamfer.

[0009] Furthermore, the high-temperature resistant sealing filler is graphite packing, ceramic fiber rope, or metal wire braid.

[0010] Furthermore, the upper and lower socket sections are made of heat-resistant stainless steel.

[0011] Furthermore, a limiting ring is provided on the upper socket section for injecting high-temperature resistant sealing filler.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the socket-type high-temperature expansion joint for boiler slag discharge pipes, through the cooperation between the upper socket section, the lower socket section, the high-temperature resistant sealing filler and fasteners, etc., firstly, during use, the socket-type sliding structure can effectively absorb the axial thermal expansion displacement of the slag discharge pipe, release the thermal stress of the pipe, and ensure system safety.

[0013] Secondly, high-temperature resistant sealing filler is used, and a pressure ring is used to continuously apply pressure, ensuring long-term sealing of ash and slag media under high temperature and pressure fluctuation environments, thus solving the leakage problem.

[0014] Furthermore, by placing the entire expansion joint inside the air chamber, its sealing structure can effectively prevent external ash and slag from entering the core sliding pair. At the same time, even if a small amount of fine ash intrudes, the flexible packing sealing structure can contain it, making it less prone to hard jamming. This fundamentally solves the problem of jamming failure caused by ash leakage from the air cap in traditional expansion joints.

[0015] Finally, the structural design takes into account maintenance needs. The filler can be replenished online or offline via the limit ring, and the sealing performance can be restored by adjusting the tightening bolts, which greatly reduces maintenance costs and downtime. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present utility model.

[0018] Explanation of reference numerals in the attached diagram: 1. Upper socket section; 2. Lower socket section; 3. High-temperature resistant sealing packing; 4. Packing pressure ring; 5. Fastener; 6. Limiting ring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1 This utility model provides a technical solution: a socket-type high-temperature expansion joint for boiler slag discharge pipe, including an upper socket section 1 installed at the upper end of the slag discharge pipe and a lower socket section 2 installed at the lower end of the slag discharge pipe. The upper socket section 1 and the lower socket section 2 are slidably connected, and an annular cavity is formed between the upper socket section 1 and the lower socket section 2. The annular cavity is filled with high-temperature resistant sealing filler 3, and a filler pressure ring 4 is provided on the upper socket section 1. The filler pressure ring 4 is installed below the high-temperature resistant sealing filler 3 and is used to compress and adjust the sealing preload of the high-temperature resistant sealing filler 3.

[0021] Specifically, the socket-type high-temperature expansion joint for boiler ash discharge pipes includes an upper socket section 1 installed at the upper end of the ash discharge pipe and a lower socket section 2 installed at the lower end of the ash discharge pipe. During installation, the entire expansion joint is placed inside the boiler air chamber. The upper flange of the upper socket section 1 is connected to the ash discharge pipe from the boiler body, and the lower flange of the lower socket section 2 is connected to the subsequent ash discharge pipe. The upper socket section 1 and the lower socket section 2 are slidably connected, and an annular cavity is formed between them. The annular cavity is filled with high-temperature resistant sealing packing 3, and a packing pressure ring 4 is provided on the upper socket section 1. The packing pressure ring 4 is installed below the high-temperature resistant sealing packing 3 and is used to compress and adjust the sealing preload of the high-temperature resistant sealing packing 3. More specifically, the expansion joint is configured entirely inside the air chamber of a circulating fluidized bed boiler, with the upper socket section 1 and the lower pipe passing through the wall of the air chamber.

[0022] Before assembly, fill the packing cavity of the lower socket section 2 with an appropriate amount of high-temperature resistant sealing packing 3 (such as high-purity graphite packing), then install the packing pressure ring 4, and finally tighten the fastener 5 consisting of double-ended studs and nuts evenly to apply the initial preload.

[0023] When the boiler is running, the slag discharge pipe expands downward due to heat, and the upper socket section 1 slides downward relative to the lower socket section 2. During this process, the high-temperature resistant sealing packing 3 remains in contact with and seals the sliding surface under continuous compression force, while allowing relative movement to occur, thereby compensating for the thermal displacement of the pipeline.

[0024] In the embodiments provided by this utility model, the packing ring 4 is installed on one side of the upper bearing section 1 by fasteners 5. The fasteners 5 include bolts installed on the packing ring 4 and nuts, with the bolts passing through the upper bearing section 1 and threadedly connected to the nuts. Specifically, there are multiple fasteners 5, evenly distributed on the packing ring 4. By evenly tightening the nuts, the packing ring 4 applies a uniform clamping force to the high-temperature resistant sealing packing 3, resulting in better performance.

[0025] In the embodiments provided by this utility model, the insertion end of the upper support segment 1 is provided with a guide chamfer, and the sliding part of the upper support segment 1 is precisely machined into a smooth cylindrical surface and provided with a guide chamfer, so as to facilitate smooth insertion with the inner hole of the sleeve of the lower support segment 2.

[0026] In the embodiments provided by this utility model, the high-temperature resistant sealing filler 3 is one of graphite packing, ceramic fiber rope or metal wire braid.

[0027] In the embodiments provided by this utility model, the upper socket section 1 and the lower socket section 2 are made of heat-resistant stainless steel, preferably 310S stainless steel, to improve the strength and service life of the mechanism.

[0028] In the embodiments provided by this utility model, a limiting ring 6 is provided on the upper socket section 1, which, together with the packing pressure ring 4, compresses and limits the high-temperature resistant sealing packing 3.

[0029] If slight leakage is found at the packing ring 4 after long-term operation, the sealing performance can be restored by tightening the nut on the fastener 5 to further compress the packing. When the packing is significantly worn, the packing ring 4 can be opened and new high-temperature resistant sealing packing 3 can be added, which greatly extends the service life of the equipment.

[0030] It should be noted that all electrical equipment involved in this application can be powered by a storage battery or an external power source, and this application is equipped with a control system for controlling the operation of the entire equipment.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within 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.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A socket-type high-temperature expansion joint for boiler slag discharge pipes, characterized in that: It includes an upper socket section (1) installed at the upper end of the slag discharge pipe and a lower socket section (2) installed at the lower end of the slag discharge pipe. The upper socket section (1) and the lower socket section (2) are slidably connected, and an annular cavity is formed between the upper socket section (1) and the lower socket section (2). The annular cavity is filled with high-temperature resistant sealing packing (3), and a packing pressure ring (4) is provided on the upper support section (1). The packing pressure ring (4) is installed below the high-temperature resistant sealing packing (3) and is used to press and adjust the sealing preload of the high-temperature resistant sealing packing (3).

2. A socket-type high-temperature expansion joint for boiler ash discharge pipes according to claim 1, characterized in that: The packing ring (4) is installed on one side of the upper bearing section (1) by fasteners (5).

3. A socket-type high-temperature expansion joint for boiler ash discharge pipes according to claim 2, characterized in that: The fastener (5) includes a bolt mounted on the packing ring (4) and a nut, which is threadedly connected to the nut after passing through the upper socket section (1).

4. A socket-type high-temperature expansion joint for boiler slag discharge pipes according to claim 1, characterized in that: The insertion end of the upper support segment (1) is provided with a guide chamfer.

5. A socket-type high-temperature expansion joint for boiler ash discharge pipes according to claim 1, characterized in that: The high-temperature resistant sealing filler (3) is made of graphite packing, ceramic fiber rope or metal wire braid.

6. A socket-type high-temperature expansion joint for boiler ash discharge pipes according to claim 1, characterized in that: The upper socket section (1) and the lower socket section (2) are made of heat-resistant stainless steel.

7. A socket-type high-temperature expansion joint for boiler slag discharge pipes according to claim 1, characterized in that: A limiting ring (6) is provided on the upper support segment (1).

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