Flexible sealing connection structure for disconnected high-temperature flue gas pipeline of rotary kiln

Abstract

The utility model discloses a flexible sealing connection structure for a disconnected high-temperature flue gas pipeline of a rotary kiln, belongs to the field of rotary kilns, and aims to solve the problems of thermal deformation and sealing caused by the temperature difference between the flue gas pipeline and a furnace body. Comprising a first pipeline section and a second pipeline section, one end of a flexible connecting pipe is welded to the inner wall of the first pipeline section, and the other end of the flexible connecting pipe is welded to the end of the second pipeline section; a gap between the inner wall of the first pipeline section and the outer wall of the second pipeline section is sealed through a sealing ring. Due to the telescopic performance of the flexible connecting pipe, a pipeline formed by connecting the first pipeline section and the second pipeline section can stretch in the axial direction, thermal deformation generated by temperature difference is automatically compensated, meanwhile, high-temperature flue gas in the pipeline is effectively sealed and isolated from materials and oil gas in the furnace, the problem that the materials, the oil gas and the like enter the pipeline is thoroughly solved, and the service life of the pipeline is prolonged. High-temperature flue gas, materials and oil gas are effectively sealed and isolated, the problems of combustion or explosion in the furnace and the like are avoided, the service life of the rotary furnace pipeline is prolonged, and the reliability and safety of equipment are improved.

Description

Technical Field

[0001] The utility model belongs to the field of rotary kilns, in particular to a rotary kiln disconnected high-temperature flue gas pipeline flexible sealing connection structure. Background Art

[0002] There is an existing internal and external heating rotary furnace, in which the built-in flue gas duct is partially arranged along the entire length of the furnace. Due to the temperature difference between the furnace body and the flue gas duct, the flue gas duct generates a large axial force. Long-term high-temperature (600-750°C) operation will cause excessive stress in the flanges and pipe welds welded to the furnace body at both ends of the pipe, resulting in cracks and leakage in the welds and even the flue gas duct body. The high-temperature oil and gas outside the flue gas duct and the high-temperature flue gas inside the flue gas duct will mix and cause combustion or explosion in the furnace. Utility Model Content

[0003] The utility model aims to provide a rotary kiln high-temperature flue gas duct sealing structure to solve the temperature difference deformation compensation and sealing problems between the flue gas duct and the furnace body, effectively avoid combustion or explosion caused by mixing of high-temperature flue gas and oil gas, and improve the service life of the high-temperature flue gas duct.

[0004] The technical solution adopted by the utility model is: a rotary kiln disconnected high-temperature flue gas duct flexible sealing connection structure, comprising a duct segment one, a duct segment two and a flexible connecting pipe that can be extended and retracted along the axial direction of the duct; the end of the duct segment two is plugged into the duct segment one; the flexible connecting pipe is located in the duct segment one, and one end thereof is welded to the inner wall of the duct segment one, and the other end is welded to the end of the duct segment two; the gap between the inner wall of the duct segment one and the outer wall of the duct segment two is sealed by a sealing ring.

[0005] Furthermore, a guide ring is provided in the gap between the inner wall of the first pipeline segment and the outer wall of the second pipeline segment, and the guide ring is welded to the inner wall of the first pipeline segment; and the inner wall of the guide ring extends radially to the outer wall of the second pipeline segment, and is movably connected to the outer wall of the second pipeline segment in the axial direction;

[0006] A plurality of high-temperature sealing fillers are used to fill the gap between the guide ring and the end of the pipeline segment 1 to form the sealing ring, and a baffle is welded at the end of the pipeline segment 1 to press the high-temperature sealing filler against the guide ring.

[0007] Furthermore, the inner end of the baffle extends radially to the outer wall of the second pipeline segment and is movably connected to the outer wall of the second pipeline segment along the axial direction.

[0008] Furthermore, the flexible connecting pipe is a metal bellows.

[0009] Furthermore, it also includes a protection tube, which is located in the metal bellows, one end of which is inserted into the second pipe segment and welded to the second pipe segment, and the other end is free and extends axially along the metal bellows to the entire length of the metal bellows.

[0010] The beneficial effects of the utility model are as follows: in the utility model, the pipeline segment 1 and the pipeline segment 2 are disconnected at the connection, and the disconnected pipeline segment 1 and the pipeline segment 2 are connected into one pipeline through a flexible connecting pipe, and the flexible connecting pipe has a telescopic performance, so that the pipeline formed by the pipeline segment 1 and the pipeline segment 2 can be telescopic along the axial direction, and automatically compensate for the thermal deformation caused by the temperature difference. At the same time, the flexible connecting pipe and the sealing ring work together to effectively seal and isolate the high-temperature flue gas in the pipe from the materials and oil and gas in the furnace, and avoid the materials and oil and gas in the furnace from entering the pipe through the joint of the pipeline segment 1 and the pipeline segment 2. Therefore, the utility model completely solves the problem of materials, oil and gas entering the interior of the pipeline, effectively seals and isolates the high-temperature flue gas from the materials and oil and gas, avoids problems such as combustion or explosion in the furnace, and the service life of the rotary kiln pipeline is extended, and the reliability and safety of the equipment are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the utility model;

[0012] Figure 2 for Figure 1 A partial enlarged view of point A.

[0013] In the figure, there are pipeline segment one 1, pipeline segment two 2, flexible connecting pipe 3, guide ring 4, sealing ring 5, baffle 6, and protective pipe 7. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0015] Flexible sealing connection structure of disconnected high-temperature flue gas duct of rotary furnace, such as Figure 1 or Figure 2As shown, it includes pipeline segment 1, pipeline segment 2 and flexible connecting pipe 3 that can be extended and retracted along the pipeline axial direction, and the end of pipeline segment 2 2 is inserted into pipeline segment 1. Flexible connecting pipe 3 that can be extended and retracted along the pipeline axial direction, that is, flexible connecting pipe 3 has a certain ability to extend or shorten. In the utility model, pipeline segment 1 and pipeline segment 2 2 are disconnected at the connection point, and the flexible connecting pipe 3 is located in pipeline segment 1, and one end thereof is welded to the inner wall of pipeline segment 1, and the weld between flexible connecting pipe 3 and the inner wall of pipeline segment 1 surrounds the inner wall of pipeline segment 1; the other end is welded to the end of pipeline segment 2 2, and the weld between the ends of flexible connecting pipe 3 and pipeline segment 2 2 surrounds pipeline segment 2 2. In this way, the flexible connecting pipe 3 connects the disconnected pipeline segment 1 and pipeline segment 2 2 into a pipeline, and cooperates with the telescopic performance of the flexible connecting pipe 3, so that the pipeline formed by pipeline segment 1 and pipeline segment 2 2 can be extended and retracted along the axial direction, and automatically compensates for the thermal deformation caused by the temperature difference. The flexible connecting pipe 3 is welded with the pipe segment 1 and the pipe segment 2 to seal and isolate the high-temperature flue gas in the pipe from the materials and oil and gas in the furnace, and prevent the high-temperature flue gas in the pipe from mixing with the high-temperature oil and gas in the furnace. The sealing ring 5 also plays a sealing role. The high-temperature flue gas in the pipe is effectively sealed and isolated from the materials and oil and gas in the furnace through the double sealing effect of the flexible connecting pipe 3 and the sealing ring 5, and the materials and oil and gas in the furnace are prevented from entering the pipe through the joint of the pipe segment 1 and the pipe segment 2. Therefore, the utility model completely solves the problem of materials, oil and gas entering the interior of the pipeline, effectively seals and isolates the high-temperature flue gas from the materials and oil and gas, and avoids problems such as combustion or explosion in the furnace. Since the pipeline segment 1 and the pipeline segment 2 are disconnected and then connected through the flexible connecting pipe 3, compared with the pipeline segment 1 and the pipeline segment 2 not being disconnected, the thermal deformation caused by the temperature difference between the furnace body and the pipeline between the pipeline segment 1 and the pipeline segment 2 is solved, which greatly reduces the axial force generated by the pipeline, thereby greatly alleviating the problem of cracks in the welding flanges and pipeline welds between the two ends of the pipeline and the furnace body, the service life of the high-temperature flue gas pipeline is extended, and the reliability and safety of the equipment are improved.

[0016] A guide ring 4 is provided in the gap between the inner wall of the pipeline segment 1 and the outer wall of the pipeline segment 2. The guide ring 4 is welded to the inner wall of the pipeline segment 1; and the inner wall of the guide ring 4 extends radially to the outer wall of the pipeline segment 2, and is movably connected to the outer wall of the pipeline segment 2 in the axial direction. The guide ring 4 plays a certain supporting role between the inner wall of the pipeline segment 1 and the outer wall of the pipeline segment 2. The guide ring 4 slides on the pipeline segment 2, and compared with direct sliding between the inner wall of the pipeline segment 1 and the outer wall of the pipeline segment 2, the friction resistance is reduced, which is more conducive to reducing the axial force between the pipeline segment 1 and the pipeline segment 2, and can even make the axial force between the pipeline segment 1 and the pipeline segment 2 almost non-existent.

[0017] The guide ring 4 also serves to block the sealing filler and form an effective seal, such as: multiple high-temperature sealing fillers are used to fill the sealing ring 5 between the guide ring 4 and the end of the pipeline segment 1, and a baffle 6 is welded at the end of the pipeline segment 1. The baffle 6 and the guide ring 4 are used to press the high-temperature sealing filler. The inner end of the baffle 6 extends radially to the outer wall of the pipeline segment 2 2 and is axially movably connected to the outer wall of the pipeline segment 2 2. The baffle 6 and the guide ring 4 are used to press the high-temperature sealing filler, which is conducive to improving the sealing performance of the sealing ring 5 and solving the problem of the furnace material, oil and gas entering the pipeline.

[0018] The flexible connecting pipe 3 is a metal bellows which can freely expand and contract along the axial direction, automatically compensate for the thermal deformation caused by the temperature difference, and effectively seal and isolate the high-temperature flue gas in the pipe from the materials and oil gas in the furnace. The metal bellows also has a certain circumferential flexibility, which can solve the impact caused by certain installation errors.

[0019] In order to solve the high-speed scouring of the bellows by high-temperature flue gas and extend the service life of the bellows, a protection tube 7 is also included, which is located in the metal bellows, one end of which is inserted into the pipe segment 2 2 and welded to the pipe segment 2 2, and the other end is free and extends along the axial direction of the metal bellows to the entire length of the metal bellows.

Claims

1. The rotary kiln disconnected high temperature flue gas duct flexible sealing connection structure is characterized by: The invention comprises a pipeline segment 1 (1), a pipeline segment 2 (2) and a flexible connecting pipe (3) which is retractable along the pipeline axial direction; the end of the pipeline segment 2 (2) is inserted into the pipeline segment 1 (1); the flexible connecting pipe (3) is located in the pipeline segment 1 (1), and one end of the flexible connecting pipe (3) is welded to the inner wall of the pipeline segment 1 (1), and the other end is welded to the end of the pipeline segment 2 (2); the gap between the inner wall of the pipeline segment 1 (1) and the outer wall of the pipeline segment 2 (2) is sealed by a sealing ring (5).

2. The rotary furnace disconnected high temperature flue gas duct flexible sealing connection structure according to claim 1, characterized in that: A guide ring (4) is arranged in the gap between the inner wall of the first pipeline segment (1) and the outer wall of the second pipeline segment (2), and the guide ring (4) is welded to the inner wall of the first pipeline segment (1); and the inner wall of the guide ring (4) extends radially to the outer wall of the second pipeline segment (2), and is movably connected to the outer wall of the second pipeline segment (2) along the axial direction; A plurality of high-temperature sealing fillers are filled between the guide ring (4) and the end of the pipeline segment one (1) to form the sealing ring (5), and a baffle (6) is welded to the end of the pipeline segment one (1), and the baffle (6) and the guide ring (4) are opposed to each other to press the high-temperature sealing filler.

3. The rotary furnace disconnected high temperature flue gas duct flexible sealing connection structure according to claim 2, characterized in that: The inner end of the baffle (6) extends radially to the outer wall of the second pipe segment (2) and is movably connected to the outer wall of the second pipe segment (2) along the axial direction.

4. The rotary furnace disconnectable high-temperature flue gas duct flexible sealing connection structure according to any one of claims 1 to 3, characterized in that: The flexible connecting pipe (3) is a metal bellows.

5. The rotary furnace disconnected high temperature flue gas duct flexible sealing connection structure according to claim 4, characterized in that: It also includes a protection tube (7), which is located inside the metal bellows, one end of which is inserted into the second pipe segment (2) and welded to the second pipe segment (2), and the other end is free and extends along the axial direction of the metal bellows to the entire length of the metal bellows.

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