Furnace bottom structure of annular furnace

Abstract

The utility model relates to a furnace bottom structure of an annular furnace, which comprises a lower steel structure beam, an upper steel structure beam, an inner ring limiting component and an outer ring limiting component, each of the inner ring limiting assembly and the outer ring limiting assembly comprises two limiting parts which are matched in a limiting manner and are respectively arranged on the two steel structure beams; and in the radial direction of the furnace bottom, an inner ring radial gap is formed between the two inner ring limiting parts, and / or an outer ring radial gap is formed between the two outer ring limiting parts. According to the utility model, the upper steel structure beam and the lower steel structure beam are designed to be in non-fixed connection, and the inner ring radial gap is arranged in the inner ring limiting assembly and / or the outer ring radial gap is arranged in the outer ring limiting assembly, so that the requirement of space allowance required by thermal expansion deformation of the upper steel structure beam can be met; the phenomenon that the mechanical clamping fault of the furnace bottom is caused by plastic deformation of the upper steel structure beam is effectively reduced / avoided, and the operation reliability and safety of the furnace bottom structure of the annular furnace are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of annular furnaces, and particularly relates to a furnace bottom structure of an annular furnace. Background Art

[0002] Ring furnaces are primarily used for the environmentally friendly treatment of zinc- and iron-containing dust and sludge in steel plants, effectively addressing the resource utilization of solid waste in these enterprises. Rotary hearth furnaces are a widely used type of ring furnace, employing direct reduction technology, primarily for processing waste materials such as iron ore fines and iron- and zinc-containing dust. As a key component of the ring furnace system, the furnace bottom mechanical steel structure plays a crucial role in ensuring safe and reliable operation during production.

[0003] The furnace bottom mechanical steel structure primarily consists of upper and lower steel beams. The lower steel beams are located in an environment close to room temperature, resulting in minimal thermal expansion. However, the upper steel beams, in direct contact with the furnace bottom refractory material, experience higher temperatures and experience greater thermal expansion. Because the upper and lower steel beams are fixedly connected, thermal expansion can easily cause permanent plastic deformation of the circumferential tension beams in the upper steel beams. This deformation doesn't return to its original shape even after the furnace is shut down and cooled. This can cause the furnace's outer ring seam to disappear, leading to interference between the outer ring bricks of the rotating furnace bottom and the inner wall of the outer ring furnace wall. This can prevent the furnace bottom mechanical system from rotating, resulting in a stuck condition. Utility Model Content

[0004] The utility model relates to a furnace bottom structure of an annular furnace, which can at least solve some defects of the prior art.

[0005] The utility model relates to a furnace bottom structure of an annular furnace, comprising a lower steel structure beam and an upper steel structure beam, wherein both the lower steel structure beam and the upper steel structure beam are annular structure beams, and the upper steel structure beam is non-fixedly arranged on the lower steel structure beam.

[0006] It also includes at least one group of inner ring limiting components and at least one group of outer ring limiting components; the inner ring limiting component includes a first inner ring limiting portion and a second inner ring limiting portion that are matched for limiting, the first inner ring limiting portion is provided on the inner ring side of the lower steel structure beam, and the second inner ring limiting portion is provided on the inner ring side of the upper steel structure beam; the outer ring limiting component includes a first outer ring limiting portion and a second outer ring limiting portion that are matched for limiting, the first outer ring limiting portion is provided on the outer ring side of the lower steel structure beam, and the second outer ring limiting portion is provided on the outer ring side of the upper steel structure beam;

[0007] In the radial direction of the furnace bottom, there is an inner ring radial gap between the first inner ring limiting portion and the corresponding second inner ring limiting portion, and / or there is an outer ring radial gap between the first outer ring limiting portion and the corresponding second outer ring limiting portion.

[0008] As one of the implementation modes, the inner ring radial gap and / or the outer ring radial gap are adjustable.

[0009] As one of the embodiments, in the inner ring limit assembly, one inner ring limit part is an inner ring stopper, and the other inner ring limit part includes a bolt seat installed on the corresponding structural beam and an adjusting bolt threadedly connected to the bolt seat, the axis of the adjusting bolt is parallel to the radial direction of the furnace bottom, and one end of the adjusting bolt is close to the inner ring stopper and forms the inner ring radial gap.

[0010] As one of the implementation modes, in the outer ring limiting assembly, one outer ring limiting portion is an outer ring stopper, and the other outer ring limiting portion is an outer ring limiting block, and the outer ring radial gap is formed between the outer ring limiting block and the outer ring stopper.

[0011] As one of the implementation modes, in the radial direction of the furnace bottom, the first inner ring limit portion is located on the side of the corresponding second inner ring limit portion away from the furnace bottom axis, and the first outer ring limit portion is located on the side of the corresponding second outer ring limit portion close to the furnace bottom axis.

[0012] As one of the embodiments, there are multiple groups of inner ring limit assemblies, which are spaced apart in sequence along the circumference of the furnace bottom, and / or there are multiple groups of outer ring limit assemblies, which are spaced apart in sequence along the circumference of the furnace bottom.

[0013] As one of the implementation modes, the cross-sectional center line of the upper steel structure beam and the cross-sectional center line of the lower steel structure beam are staggered.

[0014] As one of the implementation modes, the lower steel structure beam is formed by splicing a plurality of groups of lower fan-shaped beam bodies, and an annular gap is provided between each two adjacent groups of lower fan-shaped beam bodies.

[0015] As one of the implementation methods, each two adjacent groups of lower fan-shaped beams are spliced ​​together by a plurality of connecting bolts, and the bolt connection position is close to the inner ring side of the lower steel structure beam.

[0016] As one of the implementation methods, the lower steel structure beam is formed by splicing multiple groups of lower fan-shaped beams, and a lower beam splicing position is formed between every two adjacent groups of lower fan-shaped beams; the upper steel structure beam is formed by splicing multiple groups of upper fan-shaped beams, and an upper beam splicing position is formed between every two adjacent groups of upper fan-shaped beams; the projection of each lower beam splicing position on the horizontal plane and the projection of each upper beam splicing position on the horizontal plane are staggered in sequence.

[0017] The utility model has at least the following beneficial effects:

[0018] In the present invention, the upper steel structure beam and the lower steel structure beam are designed to be non-fixedly connected, and an inner ring radial gap is set in the inner ring limit assembly and / or an outer ring radial gap is set in the outer ring limit assembly, which can meet the space margin requirements required for thermal expansion and deformation of the upper steel structure beam, effectively reduce / avoid the phenomenon of mechanical jamming failure of the furnace bottom due to plastic deformation of the upper steel structure beam, and improve the operating reliability and safety of the furnace bottom structure of the annular furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of the lower steel structure beam provided in an embodiment of the present utility model;

[0021] Figure 2 for Figure 1 A magnified schematic diagram of part A;

[0022] Figure 3 This is a cross-sectional structural diagram of the furnace bottom structure provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] like Figure 1-Figure 3 An embodiment of the utility model provides a furnace bottom structure of an annular furnace, including a lower steel structure beam 1 and an upper steel structure beam 2. The lower steel structure beam 1 and the upper steel structure beam 2 are both annular structure beams, and the upper steel structure beam 2 is non-fixedly arranged on the lower steel structure beam 1.

[0025] The upper steel structure beam 2 is not fixedly connected to the lower steel structure beam 1, so the upper steel structure beam 2 can expand and deform freely due to heat, and will not cause irreversible deformation of the upper steel structure beam 2 due to the constraint of the lower steel structure beam 1; for example, the upper steel structure beam 2 can be directly placed on the lower steel structure beam 1.

[0026] Furthermore, if Figure 3The furnace bottom structure further includes at least one set of inner ring limiting components and at least one set of outer ring limiting components; the inner ring limiting components include a first inner ring limiting portion 12 and a second inner ring limiting portion 21 that cooperate in limiting, the first inner ring limiting portion 12 being arranged on the inner ring side of the lower steel structure beam 1, and the second inner ring limiting portion 21 being arranged on the inner ring side of the upper steel structure beam 2; the outer ring limiting components include a first outer ring limiting portion 13 and a second outer ring limiting portion 22 that cooperate in limiting, the first outer ring limiting portion 13 being arranged on the outer ring side of the lower steel structure beam 1, and the second outer ring limiting portion 22 being arranged on the outer ring side of the upper steel structure beam 2. Through the constraints of the inner ring limiting components and the outer ring limiting components, the stability and safety of the upper steel structure beam 2 set on the lower steel structure beam 1 can be guaranteed.

[0027] Furthermore, in the radial direction of the furnace bottom, an inner ring radial gap is defined between the first inner ring stopper 12 and the corresponding second inner ring stopper 21, and / or an outer ring radial gap is defined between the first outer ring stopper 13 and the corresponding second outer ring stopper 22. By providing the inner ring radial gap and / or the outer ring radial gap, the required spatial margin for thermal expansion and deformation of the upper steel structure beam 2 is met, effectively reducing / avoiding mechanical seizures of the furnace bottom caused by plastic deformation of the upper steel structure beam 2, and improving the operational reliability and safety of the annular furnace bottom structure.

[0028] Preferably, there are multiple sets of inner ring limiter assemblies, which are spaced apart along the circumference of the furnace bottom, and / or there are multiple sets of outer ring limiter assemblies, which are spaced apart along the circumference of the furnace bottom. Providing multiple sets of limiter assemblies can improve the structural stability and reliability of the upper steel structure beam 2 mounted on the lower steel structure beam 1; preferably, multiple sets of inner ring limiter assemblies and multiple sets of outer ring limiter assemblies are provided.

[0029] In one embodiment, the inner ring radial gap and / or the outer ring radial gap are adjustable, so that the inner ring radial gap / outer ring radial gap can be adjusted according to the furnace temperature, while reliably constraining the upper steel structure beam 2 and ensuring that the upper steel structure beam 2 is not fixedly connected to the lower steel structure beam 1.

[0030] For limit components with adjustable radial clearance, such as Figure 3 Optionally, one of the limiting parts is a limiting block, and the other limiting part includes a bolt seat installed on the corresponding structural beam and an adjusting bolt threadedly connected to the bolt seat, the axis of the adjusting bolt is parallel to the radial direction of the furnace bottom, and one end of the adjusting bolt is close to the limiting block and forms a radial gap.

[0031] For radial clearance fixed limit components, such as Figure 3Optionally, one of the limiting parts is a limiting block, and the other limiting part is a limiting block, and a radial gap is formed between the limiting blocks.

[0032] In this embodiment, including but not limited to:

[0033] The inner ring limit assembly adopts the above-mentioned limit stopper-adjusting bolt structure, that is, the inner ring limit assembly is a limit assembly with adjustable radial clearance, and the inner ring radial clearance is adjustable;

[0034] The outer ring limit assembly adopts the above-mentioned limit block-limit block structure, that is, the outer ring limit assembly is a limit assembly with a fixed radial gap, and the outer ring radial gap is not adjustable (obviously excluding the factor of the outer ring radial gap change caused by the plastic deformation of the upper steel structure beam 2).

[0035] Preferably, if Figure 3 In the furnace bottom radial direction, the first inner ring stopper 12 is located on the side of the corresponding second inner ring stopper 21 that is away from the furnace bottom axis, and the first outer ring stopper 13 is located on the side of the corresponding second outer ring stopper 22 that is closer to the furnace bottom axis. This design facilitates the placement of the various stoppers and the installation of the upper steel structure beam 2.

[0036] In one embodiment, in the initial state (ie before baking), the radial clearance of the inner ring is within the range of 8 to 15 mm, and the radial clearance of the outer ring is within the range of 8 to 15 mm, preferably controlled at about 10 mm.

[0037] Among them, such as Figure 3 The upper steel structure beam 2 and the lower steel structure beam 1 are assembled to form a ring-shaped saddle structure. The top of the upper steel structure beam 2 is lined with refractory materials. The pellets to be heated and reduced are placed on the surface of the refractory materials and move in a circular motion as the furnace bottom structure rotates, and are heated and reduced.

[0038] Preferably, if Figure 3 The inner ring beam of the lower steel structure beam 1 is a ring structure formed by bending an I-beam, and is welded with a ring centering track 14; the outer ring beam of the lower steel structure beam 1 is a ring structure formed by bending an I-beam, and is connected to the pin gear ring 15.

[0039] Preferably, if Figure 3 The inner ring bottom of the upper steel structure beam 2 is installed with an inner ring scraper frame 231, and the outer ring bottom of the upper steel structure beam 2 is installed with an outer ring scraper frame 232; the inner ring top of the upper steel structure beam 2 is installed with an inner ring side plate 241, and the inner ring top of the upper steel structure beam 2 is installed with an outer ring side plate 242. The inner ring side plate 241 and the outer ring side plate 242 can form a water-cooled sealing groove with the furnace bottom to prevent heat from radiating downward, so as to protect the furnace bottom drive device and rollers, centering rollers and other devices below.

[0040] In one embodiment, Figure 3 The cross-sectional center line 20 of the upper steel structure beam 2 is offset from the cross-sectional center line 10 of the lower steel structure beam 1. This design can prevent the thermal stress deformation from being concentrated in one place; the deviation e between the two can be determined based on factors such as the design value of the annular diameter of the furnace bottom structure and the heat transfer temperature.

[0041] Preferably, if Figure 1 and Figure 2 The lower steel structure beam 1 is formed by splicing multiple groups of lower fan-shaped beams 11, and the upper steel structure beam 2 is formed by splicing multiple groups of upper fan-shaped beams; wherein, a lower beam splicing position 110 is formed between each two adjacent groups of lower fan-shaped beams 11, and an upper beam splicing position is formed between each two adjacent groups of upper fan-shaped beams. Preferably, the lower beam splicing position 110 and the upper beam splicing position are staggered to ensure the stress performance and operational reliability of the furnace bottom structure, that is, the projection of each lower beam splicing position 110 on the horizontal plane and the projection of each upper beam splicing position on the horizontal plane are staggered in sequence, and the misalignment between the lower beam splicing position 110 and the adjacent upper beam splicing position is preferably 4 to 10°, and more preferably about 6°.

[0042] In one embodiment, there is an annular gap between each two adjacent groups of lower fan-shaped beams 11 to prevent thermal expansion, extrusion and deformation between the lower fan-shaped beams 11; the annular gap is in the range of 8 to 15 mm, and is preferably controlled at about 10 mm.

[0043] Furthermore, the out-of-roundness tolerance of the circular ring formed by splicing the lower fan-shaped beams 11 is within the range of ±10 mm.

[0044] In one embodiment, each two adjacent groups of lower fan-shaped beams 11 are spliced ​​together by multiple connecting bolts, and the bolt connection position is close to the inner ring side of the lower steel structure beam 1, and the outer ring side of the lower steel structure beam 1 is not fixed, so as to avoid thermal expansion, deformation and damage of the lower steel structure beam 1 due to full circumferential fixation.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A furnace bottom structure of an annular furnace, comprising a lower steel structure beam and an upper steel structure beam, wherein both the lower steel structure beam and the upper steel structure beam are annular structure beams, characterized in that: The upper steel structure beam is non-fixedly arranged on the lower steel structure beam, It also includes at least one group of inner ring limiting components and at least one group of outer ring limiting components; the inner ring limiting component includes a first inner ring limiting portion and a second inner ring limiting portion that are matched for limiting, the first inner ring limiting portion is provided on the inner ring side of the lower steel structure beam, and the second inner ring limiting portion is provided on the inner ring side of the upper steel structure beam; the outer ring limiting component includes a first outer ring limiting portion and a second outer ring limiting portion that are matched for limiting, the first outer ring limiting portion is provided on the outer ring side of the lower steel structure beam, and the second outer ring limiting portion is provided on the outer ring side of the upper steel structure beam; In the radial direction of the furnace bottom, there is an inner ring radial gap between the first inner ring limiting portion and the corresponding second inner ring limiting portion, and / or there is an outer ring radial gap between the first outer ring limiting portion and the corresponding second outer ring limiting portion.

2. The bottom structure of the annular furnace according to claim 1, characterized in that: The inner ring radial gap and / or the outer ring radial gap are adjustable.

3. The bottom structure of the annular furnace according to claim 1 or 2, characterized in that: In the inner ring limiting assembly, one inner ring limiting part is an inner ring stopper, and the other inner ring limiting part includes a bolt seat installed on the corresponding structural beam and an adjusting bolt threadedly connected to the bolt seat, the axis of the adjusting bolt is parallel to the radial direction of the furnace bottom, and one end of the adjusting bolt is close to the inner ring stopper and forms the inner ring radial gap.

4. The bottom structure of the annular furnace according to claim 1, characterized in that: In the outer ring limiting assembly, one outer ring limiting portion is an outer ring stopper, and the other outer ring limiting portion is an outer ring limiting block, and the outer ring radial gap is formed between the outer ring limiting block and the outer ring stopper.

5. The bottom structure of the annular furnace according to claim 1, characterized in that: In the radial direction of the furnace bottom, the first inner ring limiting portion is located on the side of the corresponding second inner ring limiting portion away from the furnace bottom axis, and the first outer ring limiting portion is located on the side of the corresponding second outer ring limiting portion close to the furnace bottom axis.

6. The furnace bottom structure of the annular furnace according to claim 1, characterized in that: There are multiple groups of inner ring limiting components, which are spaced apart in sequence along the circumference of the furnace bottom, and / or there are multiple groups of outer ring limiting components, which are spaced apart in sequence along the circumference of the furnace bottom.

7. The bottom structure of the annular furnace according to claim 1, characterized in that: The cross-sectional center line of the upper steel structure beam and the cross-sectional center line of the lower steel structure beam are staggered.

8. The bottom structure of the annular furnace according to claim 1, characterized in that: The lower steel structure beam is formed by splicing a plurality of groups of lower fan-shaped beam bodies, and an annular gap is provided between each two adjacent groups of lower fan-shaped beam bodies.

9. The bottom structure of the annular furnace according to claim 8, characterized in that: Each two adjacent groups of lower fan-shaped beams are spliced ​​together by a plurality of connecting bolts, and the bolt connection position is close to the inner ring side of the lower steel structure beam.

10. The bottom structure of the annular furnace according to claim 1, characterized in that: The lower steel structure beam is formed by splicing multiple groups of lower fan-shaped beams, and a lower beam splicing position is formed between every two adjacent groups of lower fan-shaped beams; the upper steel structure beam is formed by splicing multiple groups of upper fan-shaped beams, and an upper beam splicing position is formed between every two adjacent groups of upper fan-shaped beams; the projections of each lower beam splicing position on the horizontal plane and the projections of each upper beam splicing position on the horizontal plane are alternately distributed in sequence.

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