Refractory lining body structure used on regenerative double-chamber aluminum melting furnace

Abstract

The utility model belongs to the technical field of smelting equipment structures, and particularly relates to a refractory lining body structure for a regenerative double-chamber aluminum melting furnace, which comprises a heat preservation refractory wall unit arranged on a partition plate and used for forming a combustion chamber, and a refractory steel cylinder body unit inserted into a waste residue discharge hole, the heat preservation fireproof wall unit is arranged on the inner ring face of the fireproof steel cylinder body unit, the heat insulation fireproof ring unit is arranged on the inner ring face of the fireproof steel cylinder body unit, and the fireproof pouring material ring is arranged between the heat preservation fireproof wall unit and the heat insulation fireproof ring unit and used for covering the end face of the fireproof steel cylinder body unit. When the waste residue passes through the waste residue discharge hole, obvious thermal damage to a partition plate area near the hole is not easy to cause.

Description

Technical Field

[0001] This utility model belongs to the technical field of smelting equipment structure, and in particular relates to a refractory lining structure used in a regenerated double-chamber aluminum melting furnace. Background Technology

[0002] The commonly used double-chamber aluminum melting furnace for recycling mainly consists of a furnace body, baffles, a combustion lance, a waste gas pipe, and an inlet pipe. The two sides of the baffles are the combustion chamber and the waste chamber, which is the meaning of the term "double-chamber" mentioned above.

[0003] On the other hand, compared with primary aluminum smelting, one of the prominent characteristics of recycled aluminum smelting is the relatively large amount of slag produced. Therefore, the dual-chamber aluminum melting furnace is particularly suitable for recycled aluminum smelting operations, that is, the aforementioned waste chamber can temporarily store a large amount of recycled aluminum smelting waste slag.

[0004] Therefore, channels need to be made in the baffle to allow waste residue to leave the combustion chamber and fall into the waste chamber. Correspondingly, the refractory lining structure on the baffle also needs to be perforated.

[0005] For example, Chinese invention patent application CN115046389A, with publication date of September 13, 2022, discloses a novel double-chamber aluminum melting furnace structure, including a first melting chamber, a second melting chamber, and a connecting cylinder. The first melting chamber is provided with a molten pool, a furnace bottom is provided below the molten pool, and a combustion chamber is provided below the molten pool. The combustion chamber is installed in the first melting chamber, and a furnace wall is provided between the molten pool and the combustion chamber in the first melting chamber. A burner head is provided in the combustion chamber.

[0006] The dual-chamber aluminum melting furnace structure in this invention patent application has the following advantages: short melting time, energy saving, reduced gas and electricity costs, easy operation, reduced labor costs, high output, and two aluminum liquid interconnection holes between the second and first furnace chambers, allowing the aluminum liquid in the first furnace chamber to flow into the second furnace chamber.

[0007] However, in actual use, this dual-chamber aluminum melting furnace structure still has at least the following shortcomings:

[0008] At the aluminum liquid interconnection port and preheating pressure relief port structure, whether it is hot air flow, waste residue or aluminum liquid, the material passing through is prone to thermal damage to the furnace chamber side plate at the separation point due to its own excessive temperature. Utility Model Content

[0009] This utility model provides a refractory lining structure for use in a regenerated double-chamber aluminum melting furnace. The technical problem it aims to solve is: how to prevent waste slag, which is still at a relatively high temperature, from causing significant thermal damage to the partition when it passes through the opening in the partition.

[0010] The technical solution adopted by this utility model to solve the above problems is: a refractory lining structure for use in a regenerated double-chamber aluminum melting furnace, including a heat-insulating refractory wall unit disposed on a partition and used to form a combustion chamber, a refractory steel cylinder unit inserted into a waste discharge hole, a heat-insulating refractory ring unit disposed on the inner ring surface of the refractory steel cylinder unit, and a refractory castable ring disposed between the heat-insulating refractory wall unit and the heat-insulating refractory ring unit and used to cover the end face of the refractory steel cylinder unit.

[0011] A further preferred technical solution is that the heat-insulating fire-resistant wall unit includes refractory precast bricks disposed on the partition and refractory casting joints disposed on the refractory precast bricks.

[0012] A further preferred technical solution is that the heat-insulating fire-resistant wall unit also includes a heat-insulating layer disposed between the partition and the fire-resistant precast bricks.

[0013] A further preferred technical solution is that the refractory steel cylinder unit includes a cylinder inserted into the waste discharge hole, and a limiting ring disposed on the outer ring surface of the cylinder, located on one side of the waste chamber, and used to connect the partition plate.

[0014] A further preferred technical solution is that the refractory steel cylinder unit further includes an inclined plate disposed on the outer ring surface of the cylinder and located on one side of the waste chamber, and used to connect the partition plate.

[0015] A further preferred technical solution is that the heat-insulating refractory ring unit includes an arc-shaped refractory brick disposed on the inner ring surface of the cylinder, and a heat-insulating casting joint disposed on the arc-shaped refractory brick.

[0016] A further preferred technical solution is that the heat-insulating and fire-resistant ring unit also includes a heat-insulating layer disposed between the cylinder and the arc-shaped fire-resistant brick.

[0017] A further preferred technical solution is that the heat-insulating refractory ring unit further includes a groove disposed on the side of the arc-shaped refractory brick and used to engage the heat-insulating casting joint.

[0018] A further preferred technical solution is that the fire-resistant steel cylinder unit further includes a slot disposed on the inner circumferential surface of the cylinder and used to engage the heat insulation layer.

[0019] A further preferred technical solution is that the fire-resistant steel cylinder unit further includes an opening provided on the limiting ring, a screw rod inserted into the opening for welding the partition plate, and a nut provided on the screw rod for fastening the limiting ring.

[0020] The beneficial effects of this utility model include at least the following:

[0021] First, the waste slag generated during the smelting of recycled aluminum raw materials is unlikely to cause significant thermal damage to the partition area near the opening when it passes through the waste slag discharge hole.

[0022] Secondly, the direct insulation structure composed of the fire-resistant steel cylinder unit and the heat-insulating fire-resistant ring unit has the advantage of stable installation on the partition plate, ensuring that the above-mentioned function of not easily causing thermal damage can be effective for a long time.

[0023] Third, the direct insulation structure composed of the refractory steel cylinder unit and the heat-insulating refractory ring unit has the advantage of simple and convenient disassembly and assembly operation at the waste discharge hole. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 This is a schematic diagram showing the location and shape of the waste discharge hole in this utility model.

[0026] Figure 3 This is a schematic diagram showing the position of the refractory castable ring in this utility model.

[0027] Figure 4 This is a schematic diagram of another cross-sectional shape of the refractory castable ring in this utility model.

[0028] Figure 5 This is a schematic diagram showing the positions of the insulation layer and the heat insulation layer in this utility model.

[0029] Figure 6 This is a schematic diagram showing the position and shape of the channel in this utility model.

[0030] Figure 7 This is a schematic diagram of the structure of the fire-resistant steel cylinder unit in this utility model.

[0031] Figure 8 This is a schematic diagram showing the positions of the slot and the screw in this utility model.

[0032] The meanings of the markings in the diagram are as follows:

[0033] a) Baffle plate, b) Waste discharge hole, c) Recycled aluminum liquid, d) Furnace body, e) Burner, f) Waste discharge direction;

[0034] Thermal insulation and fireproof wall unit 1, fireproof steel cylinder unit 2, heat insulation and fireproof ring unit 3, fireproof castable ring 4;

[0035] Refractory precast brick 101, refractory casting joint 102, insulation layer 103;

[0036] 201. Cylinder body 202. Limiting ring 202. Inclined plate 203. Slot 204. Opening 205. Screw 206. Nut 207;

[0037] 301. Curved refractory brick, 302. Insulating casting joint, 303. Insulating layer, 304. Channel. Detailed Implementation

[0038] The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

[0039] As attached Figure 1-8 As shown, a refractory lining structure for use in a regenerated double-chamber aluminum melting furnace includes an insulating refractory wall unit 1 disposed on a partition a and used to form a combustion chamber, a refractory steel cylinder unit 2 inserted into a waste discharge hole b, a heat-insulating refractory ring unit 3 disposed on the inner ring surface of the refractory steel cylinder unit 2, and a refractory castable ring 4 disposed between the insulating refractory wall unit 1 and the heat-insulating refractory ring unit 3 and used to cover the end face of the refractory steel cylinder unit 2.

[0040] In this embodiment, the structure of the recycled dual-chamber aluminum melting furnace includes at least a partition plate a, a furnace body d, and a combustion lance e. The partition plate a has a waste discharge hole b. One side of the partition plate a is the combustion chamber, and the other side is the waste chamber. The heat-insulating refractory wall unit 1 is located in the combustion chamber and needs to be in continuous contact with the recycled aluminum liquid c. The waste discharge direction f is from the combustion chamber to the waste chamber. Thus, the dual-chamber melting mode for recycled aluminum raw materials is effectively implemented.

[0041] The refractory steel cylinder unit 2 and the heat-insulating refractory ring unit 3 together form a direct structure that separates the waste residue from the partition plate a, ensuring that the waste residue does not come into contact with the partition plate a during the discharge process, thereby avoiding significant thermal damage to the partition plate a. In other words, the partition plate area near the waste residue discharge hole b is not prone to deformation, cracking or other thermal damage.

[0042] On the other hand, the function of the thermal insulation and fireproof wall unit 1 includes at least:

[0043] First, the partition a is fully covered to ensure the effectiveness of the combustion chamber, that is, the recycled aluminum liquid c will not come into contact with the partition a;

[0044] Secondly, part of the fire-resistant steel cylinder unit 2 and the heat-insulating fire-resistant ring unit 3 are located in the combustion chamber, and the heat-insulating fire-resistant wall unit 1 can support and fix this part.

[0045] It should be noted that the melting temperature inside the aluminum melting furnace is generally 600-900℃. The steel plates constituting the partition a and furnace body d are ordinary steel plates, with a refractory temperature generally around 800℃. The refractory precast materials and refractory castables used in the heat-insulating refractory wall unit 1, the heat-insulating refractory ring unit 3, and the refractory castable ring 4 generally have a refractory temperature of 900-1300℃, while the refractory steel raw material of the refractory steel cylinder unit 2 generally has a refractory temperature of ≥1000℃. Therefore, the refractory function and the function of protecting the ordinary steel plates of this regenerated double-chamber aluminum melting furnace are effectively achieved.

[0046] Finally, the function of the refractory castable ring 4 includes at least the following:

[0047] First, the end face of the refractory steel cylinder unit 2 located on the combustion chamber side is covered and protected to ensure that the waste residue and recycled aluminum liquid c are always in contact only with the refractory material and do not come into contact with any steel structure.

[0048] Second, a casting connection is made between the fire-resistant steel cylinder unit 2 and the partition a; otherwise, the two can only be fixed by plugging, and the latter has relatively low fixing strength.

[0049] The thermal insulation and fireproof wall unit 1 includes a fireproof precast brick 101 disposed on the partition a, and a fireproof casting joint 102 disposed on the fireproof precast brick 101.

[0050] In this embodiment, the raw materials for the refractory precast bricks 101 and the refractory casting joints 102 can both be existing common high-temperature refractory castables. The former is a factory prefabricated product, while the latter needs to be cast in place on the partition a and between adjacent refractory precast bricks 101.

[0051] The refractory casting joint 102 has at least two functions: fixing all the refractory precast bricks 101 and completely covering the protective partition a.

[0052] It should be noted that the shape of the refractory precast brick 101 may be rectangular, hexagonal, triangular, etc. Therefore, the space left between the partition a and the refractory steel cylinder unit 2 for setting the refractory castable ring 4 is not necessarily a regular annular shape.

[0053] Therefore, the cross-sectional shape and size of the refractory castable ring 4 may be different at different locations, but as long as its basic function is effective, it is acceptable. The basic function is to cover the position on the partition a that is still exposed after the thermal insulation and fireproof wall unit 1 is installed; and to cover the combustion chamber end face of the fireproof steel cylinder unit 2.

[0054] The thermal insulation and fireproof wall unit 1 also includes a thermal insulation layer 103 disposed between the partition a and the fireproof precast brick 101.

[0055] In this embodiment, the fire resistance requirement of the insulation layer 103 can be appropriately lower than that of the refractory precast brick 101 and the refractory casting joint 102. The material of the insulation layer 103 can be a lightweight insulating castable, and its fire resistance temperature is generally ≥900℃.

[0056] On the other hand, the insulation layer 103 has better insulation performance than the refractory precast brick 101 and the refractory casting joint 102. Therefore, its first function is to reduce the heat loss of the combustion chamber and further insulate and protect the partition a.

[0057] The second function of the insulation layer 103 is to cast and connect the refractory precast bricks 101 on the partition a, so that the installation stability of the insulation and fireproof wall unit 1 is higher and it is not easy to separate from the partition a.

[0058] The refractory steel cylinder unit 2 includes a cylinder 201 inserted into the waste discharge hole b, and a limiting ring 202 disposed on the outer ring surface of the cylinder 201, located on one side of the waste chamber, and used to connect the partition a.

[0059] In this embodiment, the length of the cylinder 201 in the combustion chamber is greater than that in the waste chamber, ensuring that the waste residue falls away from the side of the waste chamber of the partition a when it falls into the waste chamber, thus preventing the waste residue from sticking to the side of the waste chamber, otherwise the waste residue would be inconvenient to recycle.

[0060] The outer diameter of the cylinder 201 is slightly smaller than the diameter of the waste discharge hole b. The limiting ring 202 is attached to and fixed on the side of the waste chamber of the partition a, ensuring that the length direction of the cylinder 201 is always fixed laterally.

[0061] The refractory steel cylinder unit 2 also includes an inclined plate 203 disposed on the outer ring surface of the cylinder 201, located on one side of the waste chamber, and used to connect the partition a.

[0062] In this embodiment, there are 2-4 inclined plates 203, which are used to further reinforce the cylinder 201 and ensure that the cylinder 201 is even horizontally fixed.

[0063] The cylinder 201, the limiting ring 202, and the inclined plate 203 are integrally formed, and the latter two are installed by welding or screwing.

[0064] The heat-insulating refractory ring unit 3 includes an arc-shaped refractory brick 301 disposed on the inner ring surface of the cylinder 201, and a heat-insulating casting joint 302 disposed on the arc-shaped refractory brick 301.

[0065] In this embodiment, the material of the arc-shaped refractory brick 301 is the same as that of the refractory precast brick 101, and the material of the heat-insulating casting joint 302 is the same as that of the refractory casting joint 102. The term "heat insulation" means refractory plus heat preservation, that is, the heat-insulating refractory ring unit 3 itself needs to be guaranteed not to be burned, and the amount of heat transferred to the refractory steel cylinder unit 2 should be minimized.

[0066] In the length direction of the cylinder 201, the arc-shaped refractory brick 301 is arranged in two complete rings. The arc-shaped refractory brick 301 protrudes from the combustion chamber end face of the cylinder 201 so that the refractory castable ring 4 can also be cast to connect the arc-shaped refractory brick 301, thereby further improving the casting and fixing strength of the arc-shaped refractory brick 301.

[0067] The other ring of arc-shaped refractory bricks 301 protrudes from the waste chamber end face of the cylinder 201 to prevent waste residue from contacting the cylinder 201. Although the refractory steel material of the cylinder 201 also has high refractory performance, its strength is still lower than that of refractory bricks. Therefore, the above-mentioned size setting is still necessary.

[0068] The heat-insulating and fire-resistant ring unit 3 also includes a heat-insulating layer 303 disposed between the cylinder 201 and the arc-shaped fire-resistant brick 301.

[0069] In this embodiment, the material and function of the heat insulation layer 303 are the same as those of the heat insulation layer 103. Its two ends do not need to protrude from the end face of the cylinder 201, but only need to fully cover the inner ring surface of the cylinder 201.

[0070] The heat-insulating and fire-resistant ring unit 3 also includes a channel 304 disposed on the side of the arc-shaped fire-resistant brick 301 and used to engage the heat-insulating casting joint 302.

[0071] In this embodiment, the arc-shaped refractory brick 301 is provided with the groove 304 on all four sides. The heat-insulating casting joint 302 can form a ring of interlocking structure on the groove 304, further strengthening the installation of the arc-shaped refractory brick 301 and making it difficult to peel off.

[0072] The fire-resistant steel cylinder unit 2 also includes a slot 204 disposed on the inner annular surface of the cylinder 201 and used to engage the heat insulation layer 303.

[0073] In this embodiment, the heat insulation layer 303 can be cured on the slot 204 to form an insertion structure, which further improves the installation and fixing strength of the heat insulation and fire-resistant ring unit 3 on the cylinder 201, making the heat insulation and fire-resistant ring unit 3 not easy to rotate or shift, nor easy to move in or out of the cylinder 201 in the length direction.

[0074] The fire-resistant steel cylinder unit 2 also includes an opening 205 provided on the limiting ring 202, a screw 206 inserted into the opening 205 and used for welding the partition a, and a nut 207 provided on the screw 206 and used for fastening the limiting ring 202.

[0075] In this embodiment, the opening 205, the screw 206 and the nut 207 cooperate with each other so that the limiting ring 202 can be installed securely on the side of the waste chamber of the partition a, and the limiting ring 202 can also be easily disassembled.

[0076] At this point, the cylinder 201 should not be welded to the waste discharge hole b, nor should the inclined plate 203 be welded to the partition plate a. The former should only be plugged in, and the latter should be screwed in using common existing methods. This will ultimately give the refractory steel cylinder unit 2 the advantage of being relatively easy to disassemble.

[0077] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings. However, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various modifications can be made without departing from the spirit of this utility model. These are non-inventive modifications and are protected by patent law as long as they fall within the scope of the claims of this utility model.

Claims

1. A refractory lining structure for use in a regenerated double-chamber aluminum melting furnace, characterized in that: It includes a heat-insulating fire-resistant wall unit (1) set on the partition (a) and used to form a combustion chamber, a fire-resistant steel cylinder unit (2) inserted into the waste discharge hole (b), a heat-insulating fire-resistant ring unit (3) set on the inner ring surface of the fire-resistant steel cylinder unit (2), and a fire-resistant castable ring (4) set between the heat-insulating fire-resistant wall unit (1) and the heat-insulating fire-resistant ring unit (3) and used to cover the end face of the fire-resistant steel cylinder unit (2).

2. The refractory lining structure for use in a regenerated double-chamber aluminum melting furnace according to claim 1, characterized in that: The heat-insulating fire-resistant wall unit (1) includes a fire-resistant precast brick (101) disposed on the partition (a) and a fire-resistant casting joint (102) disposed on the fire-resistant precast brick (101).

3. A refractory lining structure for use in a regenerated double-chamber aluminum melting furnace according to claim 2, characterized in that: The thermal insulation and fireproof wall unit (1) also includes a thermal insulation layer (103) disposed between the partition (a) and the fireproof precast brick (101).

4. A refractory lining structure for use in a regenerated double-chamber aluminum melting furnace according to claim 1, characterized in that: The refractory steel cylinder unit (2) includes a cylinder (201) inserted into the waste discharge hole (b) and a limiting ring (202) disposed on the outer ring surface of the cylinder (201) and located on one side of the waste chamber for connecting the partition (a).

5. A refractory lining structure for use in a regenerated double-chamber aluminum melting furnace according to claim 4, characterized in that: The refractory steel cylinder unit (2) also includes an inclined plate (203) disposed on the outer ring surface of the cylinder (201) and located on one side of the waste chamber, and used to connect the partition (a).

6. A refractory lining structure for use in a regenerated double-chamber aluminum melting furnace according to claim 4, characterized in that: The heat-insulating refractory ring unit (3) includes an arc-shaped refractory brick (301) disposed on the inner ring surface of the cylinder (201), and a heat-insulating casting joint (302) disposed on the arc-shaped refractory brick (301).

7. A refractory lining structure for use in a regenerated double-chamber aluminum melting furnace according to claim 6, characterized in that: The heat-insulating and fire-resistant ring unit (3) also includes a heat-insulating layer (303) disposed between the cylinder (201) and the arc-shaped fire-resistant brick (301).

8. A refractory lining structure for use in a regenerated double-chamber aluminum melting furnace according to claim 6, characterized in that: The heat-insulating fire-resistant ring unit (3) also includes a channel (304) disposed on the side of the arc-shaped fire-resistant brick (301) and used to engage the heat-insulating casting joint (302).

9. A refractory lining structure for use in a regenerated double-chamber aluminum melting furnace according to claim 7, characterized in that: The fire-resistant steel cylinder unit (2) also includes a slot (204) provided on the inner annular surface of the cylinder (201) and used to engage the heat insulation layer (303).

10. A refractory lining structure for use in a regenerated double-chamber aluminum melting furnace according to claim 4, characterized in that: The fire-resistant steel cylinder unit (2) also includes an opening (205) provided on the limiting ring (202), a screw (206) provided on the opening (205) and used for welding the partition (a), and a nut (207) provided on the screw (206) and used for fastening the limiting ring (202).

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