Bellows compensator of blast furnace air supply device

Abstract

The utility model discloses a blast furnace air supply device bellows compensator which comprises an upper half body and a lower half body, the upper half body is composed of an upper flange, an upper flange steel pipe, a fireproof material upper anchoring hook and an upper half body fireproof material, and the upper half body fireproof material is provided with a first step face and a second step face. The lower half body is composed of a steel ring steel pipe, a steel ring, a lower flange steel pipe, a lower flange, a fireproof material lower anchoring hook and a lower half body fireproof material, the lower half body fireproof material is provided with a third step face and a fourth step face, the upper half body and the lower half body are reversely buckled together, the distance between the corresponding fireproof material step faces of the upper half body and the lower half body is 30 mm-50 mm, and a long Z-shaped labyrinth sealing structure is formed. The refractory material surfaces on the two sides of the expansion joint are free of metal materials, a first expansion gasket, a second expansion gasket and inner-layer heat insulation cotton are arranged between the upper half body refractory material and the lower half body refractory material, and outer-layer heat insulation cotton is filled in an inner gap of the inner diameter of the expansion joint. The defect that the compensator is burnt out due to the fact that hot air in a channel of a conventional corrugated pipe compensator is prone to flowing to an expansion joint is overcome.

Description

Technical Field

[0001] The utility model relates to a bellows compensator used in an air supply device of an iron-making blast furnace, in particular to a long Z-shaped labyrinth bellows compensator. Background Art

[0002] The air supply device of the iron-making blast furnace is a hot air branch pipe connecting the hot air surrounding pipe and the tuyere small sleeve of the blast furnace. The hot air at about 1300℃ in the hot air surrounding pipe is sent into the blast furnace from the tuyere small sleeve through the air supply device. Since blast furnace ironmaking is a high-temperature process of long-term continuous operation, the furnace body and the hot air surrounding pipe will expand, and will shrink when the furnace is shut down for maintenance. The air supply device is installed between the hot air surrounding pipe and the tuyere of the furnace body small sleeve to adapt to this thermal expansion and contraction change. Therefore, a compensator needs to be set in the air supply device to absorb the size changes of the air inlet device caused by thermal expansion and contraction, blast furnace deformation and other reasons. The corrugated compensators currently used in the market have obvious drawbacks. First, the expansion joint is short in size. After a period of service, hot air is prone to cross-flow in the expansion joint, burning the expansion joint of the compensator, causing damage and failure of the compensator. Second, metal materials are used on the refractory surface on both sides of the expansion joint. As we all know, even heat-resistant stainless steel cannot meet the conditions of long-term high-temperature service at 1300°C. In this way, the metal materials on both sides of the expansion joint will be oxidized layer by layer, and after oxidation, low-melting-point iron oxide will be mainly formed. The iron oxide forms liquid at high temperature working temperature to corrode the refractory material and cause damage to the compensator. Of course, if expensive high-temperature resistant alloys are used, the cost-effectiveness is not suitable and the market is difficult to accept. Under the current circumstances, frequent replacement of air supply devices is not only labor-intensive and time-consuming, but also increases equipment maintenance costs, and also restricts the smooth and stable production of blast furnace ironmaking. Therefore, it is very urgent to develop a low-cost, long-lasting and reliable air supply device corrugated compensator. Summary of the invention

[0003] In order to solve and remedy the problems and defects of the existing bellows compensator of the blast furnace air supply device, the utility model adopts a long Z-shaped labyrinth sealing technology, hot air is not easy to be blown into the expansion joint, and there is no metal material on both sides of the Z-shaped expansion joint, which is more resistant to high temperature. For this purpose, a new type of bellows compensator is provided.

[0004] The technical solution of the utility model is:

[0005] A bellows compensator for a blast furnace air supply device comprises an upper body and a lower body, wherein the upper body is composed of an upper flange, an upper flange steel pipe, an upper anchor hook of a refractory material, and an upper body refractory material, wherein the upper body refractory material is provided with a first step surface and a second step surface, and the first step surface and the second step surface are 200mm-250mm apart, and the lower body is composed of a steel ring steel pipe, a steel ring, a lower flange steel pipe, a lower flange, a lower anchor hook of a refractory material, and a lower body refractory material, wherein the lower body refractory material is provided with a third step surface. The first step surface, the fourth step surface, the third step surface and the fourth step surface are 200mm-250mm apart, the upper body and the lower body are buckled together, the corresponding refractory step surfaces of the upper and lower bodies are kept at a distance of 30mm-50mm, forming a long Z-shaped labyrinth sealing structure, and there is no metal material on the refractory surface on both sides of the expansion joint, expansion gasket one, expansion gasket two and inner layer of thermal insulation cotton are arranged between the gap of the refractory materials of the upper and lower bodies, and the inner diameter of the expansion joint is filled with outer layer of thermal insulation cotton.

[0006] Preferably, the two Z-shaped short expansion joints each have a gap width of 40 mm.

[0007] Preferably, the length of the Z-shaped long expansion joint is 225 mm.

[0008] Preferably, the upper flange, steel ring, upper flange steel pipe, steel ring steel pipe, lower flange steel pipe, lower flange, and connecting pipes at both ends of the expansion joint are made of low carbon steel or low alloy steel.

[0009] Preferably, the upper flange, steel ring, upper flange steel pipe, steel ring steel pipe, lower flange steel pipe, lower flange, and connecting pipes at both ends of the expansion joint are made of Q235B or Q345B.

[0010] Preferably, the expansion joint corrugation, the upper anchor hook of the refractory material, and the lower anchor hook of the refractory material are made of austenitic oxidation-resistant steel.

[0011] Preferably, the expansion joint corrugation, the upper anchor hook of the refractory material, and the lower anchor hook of the refractory material are made of 06Cr19Ni10 stainless steel.

[0012] Preferably, the upper refractory material and the lower refractory material are made of high-alumina castable material, wherein: Al2O3 content is 65%, refractoriness is 1500°C, and volume density is 2.4g / cm3.

[0013] Beneficial technical effects of the utility model:

[0014] The bellows compensator of the blast furnace air supply device comprises an upper body and a lower body, wherein the upper body is composed of an upper flange, an upper flange steel pipe, an upper anchor hook of a refractory material, and an upper body refractory material, wherein the refractory material of the upper body is provided with a first step surface and a second step surface, and the two step surfaces are relatively far apart, and the lower body is composed of a steel ring steel pipe, a steel ring, a lower flange steel pipe, a lower flange, a lower anchor hook of a refractory material, and a lower body refractory material, wherein the refractory material of the lower body is provided with a third step surface and a fourth step surface, and the two step surfaces are also relatively far apart, and the upper body and the lower body are buckled together, and gaps are maintained between the corresponding refractory material step surfaces of the upper and lower bodies, and an expansion gasket 1, an expansion gasket 2 and an inner layer of heat insulating cotton are arranged between the gaps of the refractory materials of the upper and lower bodies, and an outer layer of heat insulating cotton is filled in the inner gap of the inner diameter of the expansion joint, so that the upper and lower bodies are buckled together to maintain a certain distance, thereby forming a long Z-shaped labyrinth sealing structure, and there is no metal material on the refractory surfaces on both sides of the expansion joint.

[0015] The upper flange, lower flange, steel ring, steel pipe and connecting pipes at both ends of the expansion joint are made of low carbon steel or low alloy steel, the expansion joint corrugation is made of austenitic anti-oxidation steel, the refractory anchor hook is made of austenitic anti-oxidation steel, the refractory material is high-aluminum castable, the insulation cotton is made of refractory fiber cotton, and the expansion gasket is made of refractory fiber felt.

[0016] Since the compensator adopts a long Z-shaped labyrinth expansion joint design, it overcomes the defect that hot air in the channel of a conventional bellows compensator is easily blown into the expansion joint and causes the compensator to burn out. After testing, the surface temperature of the expansion joint is no higher than 75°C. In particular, no metal material is used on the surface of the refractory material on both sides of the expansion joint, which overcomes the problem that the metal material used on both sides of the expansion joint is easily oxidized at high temperature to form low-melting-point iron oxide that melts and corrodes the refractory material. Based on the above improvements, the service life of the corrugated compensator is extended by more than 50% compared with the existing corrugated compensator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 This is a schematic diagram of the structure of the bellows compensator of the blast furnace air supply device.

[0018] In the figure: 1-lower flange, 2-lower flange steel pipe, 3-lower anchor hook of refractory material, 4-lower half refractory material, 5-fourth step surface, 6-expansion gasket two, 7-second step surface, 8-steel ring, 9-expansion joint, 10-steel ring steel pipe, 11-upper flange, 12-outer layer insulation cotton, 13-upper flange steel pipe, 14-upper anchor hook of refractory material, 15-first step surface, 16-expansion gasket one, 17-third step surface, 18-inner diameter surface of lower half refractory material, 19-inner layer insulation cotton, 20-upper half refractory material, 21-outer diameter surface of upper half refractory material, 22-air supply channel. DETAILED DESCRIPTION

[0019] The following describes embodiments of the present utility model in conjunction with the accompanying drawings.

[0020] like Figure 1 As shown, the bellows compensator includes an upper flange 11, an outer layer of thermal insulation cotton 12, an upper flange steel pipe 13, a Z-shaped short expansion joint and an expansion gasket 16, a Z-shaped long expansion joint inner layer of thermal insulation cotton 19, a refractory upper anchor hook 14, an upper body refractory material 20, a steel ring 8, a steel ring steel pipe 10, a lower flange steel pipe 2, a refractory lower anchor hook 3, a lower flange 1, a lower body refractory material 4, a Z-shaped short expansion joint and an expansion gasket 6, and an air supply channel 22.

[0021] The upper flange 11 is welded to the upper flange steel pipe 13, and the upper anchor hook 14 of the refractory material is welded at the inner diameter of the upper flange steel pipe 13. The above components are cast as one with the upper half refractory material 20 to form the upper half. The steel ring steel pipe 10, the steel ring 8, the lower flange steel pipe 2 are welded to the lower flange 1, and the lower anchor hook 3 of the refractory material is welded at the inner diameter of the lower flange steel pipe 2. A total of three layers of anchor hooks are set at the inner diameter of the lower flange steel pipe 2, and the above components are cast as one with the lower half refractory material 4.

[0022] The upper and lower parts are buckled together, and the connecting pipes at the upper and lower ends of the expansion joint 9 are respectively welded to the upper flange 11 of the upper part and the steel ring 8 of the lower part. The inner layer of heat insulation cotton 12 is filled between the expansion joint 9 and the upper flange steel pipe 13 and the steel ring steel pipe 10. The lower section of the upper flange steel pipe 13 and the first step surface 15 of the upper refractory material 20 are in the same plane, and the upper end surface of the steel ring steel pipe 10 and the third step surface 17 of the lower refractory material 4 are in the same plane. The two planes are 30mm-50mm apart, that is, the expansion joint width, preferably 40mm, forming a Z-shaped short expansion joint, where an expansion gasket 16 is set. The inner diameter surface 18 of the lower refractory material 4 and the outer diameter surface 21 of the upper refractory material 20 are each designed to have a length of 200mm-250mm along the axial direction, preferably 225mm, forming a Z-shaped long expansion joint, where an inner layer of heat insulation cotton 19 is filled. The fourth step surface 5 of the lower refractory material 4 is 30mm-50mm away from the second step surface 7 of the upper refractory material 20, that is, the expansion joint width, preferably 40mm, to form a Z-shaped short expansion joint 2, where an expansion gasket 2 6 is provided. 22 is an air supply channel.

[0023] The upper flange, lower flange, steel ring, steel pipe, and the connecting pipes at both ends of the expansion joint are preferably made of Q345B; the material of the expansion joint corrugation is preferably 06Cr19Ni10 stainless steel; the material of the lower refractory anchor hook 3 and the upper refractory anchor hook 14 is preferably 06Cr19Ni 10 stainless steel; the material of the lower half refractory material 4 and the upper half refractory material 20 is preferably high-aluminum castable, among which: Al 2 O 3 Content is 65%, refractoriness is 1500℃, volume density is 2.4g / cm3 The material of the outer layer heat insulation cotton 12 and the inner layer heat insulation cotton 19 is preferably zirconium fiber cotton; the material of the expansion gasket 2 6 and the expansion gasket 1 16 is preferably zirconium fiber felt.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. A bellows compensator for a blast furnace air supply device, comprising an upper body and a lower body, wherein the upper body is composed of an upper flange (11), an upper flange steel pipe (13), a refractory upper anchor hook (14), and an upper body refractory material (20), wherein the upper body refractory material (20) is provided with a first step surface (15) and a second step surface (7), wherein the first step surface (15) and the second step surface (7) are 200 mm to 250 mm apart, and wherein the lower body is composed of a steel ring steel pipe (10), a steel ring (8), a lower flange steel pipe (2), a lower flange (1), a refractory lower anchor hook (3), and a lower body refractory material (4), wherein the lower body refractory material (4) is provided with a third step surface (17) and a fourth step surface (5), wherein the third step surface (17) and the fourth step surface (5) are 200 mm to 250 mm apart, wherein: The upper and lower halves are buckled together, and the corresponding refractory step surfaces of the upper and lower halves are kept at a distance of 30mm-50mm, forming a long Z-shaped labyrinth sealing structure, and there is no metal material on the refractory surfaces on both sides of the expansion joint. Expansion gasket one (16), expansion gasket two (6) and an inner layer of thermal insulation cotton (19) are arranged between the refractory gaps of the upper and lower halves, and the inner diameter of the expansion joint (9) is filled with an outer layer of thermal insulation cotton (12).

2. The bellows compensator for blast furnace air supply device according to claim 1 is characterized in that The gap width of the two Z-shaped short expansion joints is 40mm each.

3. The bellows compensator for blast furnace air supply device according to claim 1 is characterized in that The length of the Z-shaped long expansion joint is 225mm.

4. The bellows compensator for blast furnace air supply device according to claim 1, characterized in that The upper flange (11), the steel ring (8), the upper flange steel pipe (13), the steel ring steel pipe (10), the lower flange steel pipe (2), the lower flange (1), and the connecting pipes at both ends of the expansion joint are made of low carbon steel or low alloy steel.

5. The bellows compensator for blast furnace air supply device according to claim 4 is characterized in that The upper flange (11), the steel ring (8), the upper flange steel pipe (13), the steel ring steel pipe (10), the lower flange steel pipe (2), the lower flange (1), and the connecting pipes at both ends of the expansion joint are made of Q235B or Q345B.

6. The bellows compensator for blast furnace air supply device according to claim 1, characterized in that The bellows of the expansion joint (9), the upper anchor hook (14) of the refractory material, and the lower anchor hook (3) of the refractory material are made of austenitic anti-oxidation steel.

7. The bellows compensator for blast furnace air supply device according to claim 6, characterized in that The material of the expansion joint (9) corrugation, the refractory upper anchor hook (14) and the refractory lower anchor hook (3) is 06Cr19Ni10 stainless steel.

8. The bellows compensator for blast furnace air supply device according to claim 1, characterized in that The upper refractory material (20) and the lower refractory material (4) are made of high-aluminum castable material, wherein: Al2O3 content is 65%, refractoriness is 1500°C, and volume density is 2.4g / cm3.

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