A masonry method for increasing the service life of the secondary combustion chamber of a rotary anode furnace

Abstract

The present invention discloses a masonry method for improving the service life of the secondary combustion chamber of a rotary anode furnace, relates to the field of nonferrous metallurgy, and solves the problem that the existing secondary combustion chamber cylinder has insufficient high-temperature erosion resistance and masonry fastening strength, which leads to frequent burning of the secondary combustion chamber. The method comprises the following steps: drawing welding lines on the inner surface of the secondary combustion chamber steel shell, and taking welding points on the welding lines; welding anchors on the welding points; supporting a mold in the secondary combustion chamber, using the anchors as mold support points for supporting the mold, and then pouring the mixed casting material into the gap between the mold and the inner wall of the secondary combustion chamber for casting; solidifying, removing the shaping mold, and completing the masonry; mechanical bite is generated between the fine steel wire, the anchor hook and the refractory castable, and the anchor hook plays an anchoring role. The whole structure is strong and hard, stable and durable, has good fire resistance and pressure bearing capacity, and also has good high-temperature erosion resistance, and the service life of the secondary combustion chamber is significantly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of nonferrous metallurgy, and more particularly to the technical field of inner wall masonry of a secondary combustion chamber of a rotary anode furnace. Background Art

[0002] At present, the secondary combustion chamber in the main flue system of the anode furnace in the industry is mainly made of 265.6 / 217.5*230*99 high-alumina bricks. Since the secondary combustion chamber and the zigzag flue attached to the anode furnace body need to rotate with the anode furnace body, a 30mm gap is left between the zigzag flue and the secondary combustion chamber. During the anode furnace blowing process, the natural gas that is not completely burned in the furnace body will be secondary-burned in the secondary combustion chamber. The flame generated by the combustion will backfire from this gap, accelerating the loss rate of the corresponding materials at the straight section of the zigzag flue and the inlet of the secondary combustion chamber. On the other hand, the anode furnace has to be shut down for repairs to the attached cylinder in the flue gas inlet area of ​​the secondary combustion chamber every 50-60 furnaces produced on average. The shutdown time for each repair is about 2-3 days. Frequent maintenance has a serious impact on the anode furnace production plan, and increases the cost of purchasing refractory materials and masonry for the secondary combustion chamber, which has a significant impact on the overall economic benefits of the workshop.

[0003] Application No. CN202110960035.X discloses a rotary anode furnace flue structure with improved service life, including a rotary anode furnace, a secondary combustion chamber and a zigzag flue, the end of the zigzag flue is connected to a straight tube copper water jacket, the end of the straight tube copper water jacket extends into the secondary combustion chamber inlet flue, a secondary combustion chamber copper water jacket is arranged at the secondary combustion chamber inlet flue, a serpentine cooling water pipe is coiled in the straight tube copper water jacket, one end of the straight tube copper water jacket is provided with a flange connected to the zigzag flue, the secondary combustion chamber copper water jacket includes two water jacket bodies symmetrically arranged on the outer wall of the secondary combustion chamber inlet flue by bolts, and a cooling water pipe is coiled inside the water jacket body.

[0004] Although the above patent improves the single-overhaul operating life of the zigzag flue and secondary combustion chamber of the anode furnace, since the secondary combustion chamber cylinder is made of high-aluminum bricks, its resistance to high-temperature erosion and masonry fastening strength are insufficient, resulting in frequent burning of the secondary combustion chamber. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the secondary combustion chamber cylinder has insufficient high-temperature erosion resistance and masonry fastening strength, which leads to frequent burning of the secondary combustion chamber. The present invention provides a masonry method for improving the service life of the secondary combustion chamber of a rotary anode furnace.

[0006] In order to achieve the above-mentioned object, the present invention specifically adopts the following technical solution: a masonry method for improving the service life of the secondary combustion chamber of a rotary anode furnace, comprising the following steps:

[0007] Step 1: Draw welding lines on the inner surface of the secondary combustion chamber steel shell, with a spacing of 210 to 250 mm between the welding lines, and take welding points on the welding lines, with a spacing of 180 to 220 mm between the welding points;

[0008] Step 2: Make anchors and weld them to the welding points;

[0009] Step 3: Support the mold in the secondary combustion chamber, use the anchor as the mold support point to support the mold, and then pour the mixed casting material into the gap between the mold and the inner wall of the secondary combustion chamber for casting. The mixed casting material includes a mixture and water, and the volume ratio of the mixture to water is 1:1-1.2. The mixture includes a refractory castable and 2.5-3.5 cm thin steel wire, and the volume ratio of the refractory castable to the thin steel wire is 1:8-10.

[0010] Step 4: After the casting is completed, solidify for 6 to 10 hours, remove the shaping mold, and the masonry is completed.

[0011] In the technical solution of the present application, anchors are welded inside the secondary combustion chamber, and the anchors serve as support points for the mold to support the mold and shape it. In addition, the casting method is a mixed casting method with anchor hooks. The present application uses conventional refractory castables in this field. In addition, 2.5-3.5 cm fine steel wire is combined. After casting, the refractory castable and the fine steel wire become a whole. Together with the anchor hooks, the three become a whole. There is a chemical adsorption force on the contact surface between the refractory castable and the fine steel wire and the anchor hook, that is, the bonding force. The refractory castable shrinks and tightly grips the fine steel wire and the anchor hook to generate friction. In addition, mechanical bite is generated between the fine steel wire, the anchor hook and the refractory castable, and the anchor hook plays an anchoring role. The entire structure is strong and hard, stable and durable, has good fire resistance, good pressure bearing capacity, and good resistance to high temperature erosion. The service life of the secondary combustion chamber will be significantly improved, and the production capacity of the anode furnace will be further released, which will be conducive to the efficient development of the workshop production and operation; the total number of minor repairs of the secondary combustion chamber per year will be reduced from 12 times to less than 2 times (the annual production calendar is 330 days, and the anode furnace process capacity is 2 furnaces per day), the total number of minor repairs per year will be reduced by 10 times, and the cost of refractory material procurement and masonry will be significantly reduced compared to the current level.

[0012] Preferably, the anchoring piece includes an inverted U-shaped bracket, a V-shaped support piece is provided in the upper middle part of one side of the inverted U-shaped bracket, the top of the V-shaped support piece is respectively provided with a support rod extending outward, and a short-circuit structure is provided in the middle of the support rod.

[0013] More preferably, the V-shaped support member and the support rod are integrally formed, the inverted U-shaped shaping bracket and the V-shaped support member are welded, and the support rod and the short-circuit structure are welded.

[0014] More preferably, the anchor is made of stainless steel.

[0015] More preferably, asphalt paint is applied on the surface of the anchor.

[0016] Preferably, a 5-10 mm thick asbestos board is pasted on the surface of the secondary combustion chamber and then a mold is supported inside the secondary combustion chamber.

[0017] More preferably, an 8mm thick asbestos board is pasted on the surface of the secondary combustion chamber and then a mold is supported inside the secondary combustion chamber.

[0018] Preferably, the length of the anchor is 100 to 200 mm, and the casting thickness is the same as the length of the anchor.

[0019] Preferably, the spacing between the welding lines is 230 mm, and the welding points are taken on the welding lines, and the spacing between the welding points is 200 mm.

[0020] Preferably, the volume ratio of the mixture to water is 1:1.1, the mixture includes refractory castable and 3 cm thin steel wire, and the volume ratio of the refractory castable to the thin steel wire is 1:9.

[0021] Preferably, a rotary anode furnace body is provided on one side of the secondary combustion chamber, the rotary anode furnace body and the secondary combustion chamber are connected through a sub-flue, the sub-flue is rotatably connected to the secondary combustion chamber, and a ash cleaning port is provided on the side of the secondary combustion chamber away from the sub-flue.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. After casting, the refractory castable and the fine steel wire become a whole. Together with the anchor hook, the three become a whole. There is a chemical adsorption force on the contact surface of the refractory castable, the fine steel wire and the anchor hook, that is, the bonding force. The refractory castable shrinks and tightly grips the fine steel wire and the anchor hook, generating friction. In addition, mechanical bite occurs between the fine steel wire, the anchor hook and the refractory castable. At the same time, the anchor hook plays an anchoring role. The whole structure is strong, hard, stable and durable, with good fire resistance and pressure resistance, and also has good resistance to high temperature erosion.

[0024] 2. The service life of the secondary combustion chamber will be significantly improved, and the production capacity of the anode furnace will be further released, which will be conducive to the efficient development of the workshop production and operation. The total number of minor repairs of the secondary combustion chamber will be reduced from 12 times to less than 2 times per year (the annual production calendar is 330 days, and the anode furnace process capacity is 2 furnaces per day). The total number of minor repairs per year will be reduced by 10 times, and the cost of refractory material procurement and masonry will be significantly reduced compared to the current level.

[0025] 3. The anchor is easy to manufacture and its size is adjustable, so it can be used in secondary combustion chambers of different sizes. The surface of the anchor is painted with asphalt paint, which makes it easy to quickly separate the casting material from the anchor during disassembly.

[0026] 4. The asbestos board is fixed in the secondary combustion chamber by pasting. The asbestos board plays a role of heat preservation and is convenient for installation and removal;

[0027] 5. From the perspective of improving the high-temperature resistance of the overall material of the secondary combustion chamber, the current production problem of frequent burning of the secondary combustion chamber is solved by changing the secondary combustion chamber from high-alumina brick masonry to steel fiber castables with grab hooks. The masonry method is simple and easy to promote;

[0028] 6. The short-circuit structure is used to tighten and fix the mold, making the entire mold stable and firm, and the welding method of the anchor is stable and firm. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a top view of the anchor member of the present invention;

[0030] Figure 2 yes Figure 1 Left view of;

[0031] Figure 3 This is the position layout diagram of the secondary combustion chamber in the main flue gas system of the anode furnace;

[0032] Figure 4 It is a schematic diagram of the local masonry structure on the inner surface of the secondary combustion chamber steel shell.

[0033] Figure numerals: 1-inverted U-shaped forming bracket, 2-V-shaped support member, 3-short-circuit structure, 4-support rod, 5-rotary anode furnace body, 6-sub-flue, 7-secondary combustion chamber, 8-ash cleaning port, 9-secondary combustion chamber steel shell, 10-anchor, 11-asbestos board, 12-mixed casting material, 13-mold. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0035] Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0036] Example 1

[0037] like Figure 1 、 2As shown in FIG4 , this embodiment provides a masonry method for increasing the service life of the secondary combustion chamber of a rotary anode furnace, comprising the following steps:

[0038] Step 1: Draw welding lines on the inner surface of the secondary combustion chamber steel shell 9, with a spacing of 210 mm between the welding lines, and take welding points on the welding lines, with a spacing of 180 mm between the welding points;

[0039] Step 2: Make the anchor 10 and weld the anchor 10 to the welding point;

[0040] Step 3, support the mold 13 in the secondary combustion chamber 7 (paste a 5mm thick asbestos board 11 on the surface of the secondary combustion chamber 7 and then support the mold 13 in the secondary combustion chamber 7), use the anchor 10 as the support point of the mold 13 to support the mold, so that the mold 13 is shaped, and then pour the mixed casting material 12 into the gap between the mold 13 and the inner wall of the secondary combustion chamber 7 for casting. The mixed casting material 12 includes a mixture and water, and the volume ratio of the mixture to water is 1:1. The mixture includes refractory castables and 2.5cm fine steel wire, and the volume ratio of refractory castables to fine steel wire is 1:8; wherein, the length of the anchor 10 is 200mm, and the casting thickness is 200mm.

[0041] Step 4: After the casting is completed and solidified for 6 hours, the shaping mold 13 is removed and the masonry is completed.

[0042] Example 2

[0043] A masonry method for increasing the service life of the secondary combustion chamber 7 of a rotary anode furnace:

[0044] The differences from Example 1 are as follows: in step 1, the spacing between welding lines is 230 mm, welding points are taken on the welding lines, and the spacing between welding points is 200 mm;

[0045] In step 3, an 8 mm thick asbestos board 11 is attached to the surface of the secondary combustion chamber 7 and then a mold 13 is supported inside the secondary combustion chamber 7. The volume ratio of the mixture to water is 1:1.1. The mixture includes a refractory castable and 3 cm thin steel wire. The volume ratio of the refractory castable to the thin steel wire is 1:9.

[0046] In step 4, the casting was completed and solidified for 8 hours. The remaining steps were the same as those described in Example 1.

[0047] Example 3

[0048] A masonry method for increasing the service life of the secondary combustion chamber 7 of a rotary anode furnace:

[0049] The differences from Example 1 are as follows: in step 1, the spacing between welding lines is 250 mm, and welding points are taken on the welding lines, and the spacing between welding points is 220 mm;

[0050] In step 3, a 10 mm thick asbestos board 11 is attached to the surface of the secondary combustion chamber 7 and then a mold 13 is placed inside the secondary combustion chamber 7. The volume ratio of the mixture to water is 1:1.2. The mixture includes a refractory castable and 3.5 cm thin steel wire. The volume ratio of the refractory castable to the thin steel wire is 1:10.

[0051] In step 4, the casting was completed and solidified for 10 hours. The remaining steps were the same as those described in Example 1.

[0052] In the technical solution of the present application, the length of the anchor 10 can also be 100 mm, 150 mm, etc., and the spacing between the welding lines and the spacing between the welding points can also change with the length of the anchor 10.

[0053] Example 4

[0054] like Figure 1-2 As shown, the anchor 10 includes an inverted U-shaped forming bracket 1, a V-shaped support member 2 is provided at the upper middle part of one side of the inverted U-shaped forming bracket 1, the top of the V-shaped support member 2 is respectively provided with a support rod 4 extending outward, and a short-circuit structure 3 is provided in the middle of the support rod 4; the V-shaped support member 2 and the support rod 4 are integrally formed, the inverted U-shaped forming bracket 1 and the V-shaped support member 2 are welded, and the support rod 4 and the short-circuit structure 3 are welded; the material of the anchor 10 is stainless steel, and asphalt paint is applied on the surface of the anchor 10.

[0055] Example 5

[0056] like Figure 3 As shown, a rotary anode furnace body 5 is provided on one side of the secondary combustion chamber 7. The rotary anode furnace body 5 is connected to the secondary combustion chamber 7 through a sub-flue 6. The sub-flue 6 is rotatably connected to the secondary combustion chamber 7. A cleaning port 8 is provided on the side of the secondary combustion chamber 7 away from the sub-flue 6. Figure 3 The middle arrow indicates the direction of high-temperature flue gas in the furnace.

Claims

1. A masonry method for increasing the service life of the secondary combustion chamber of a rotary anode furnace, characterized in that: The steps include: Step 1: Draw welding lines on the inner surface of the secondary combustion chamber steel shell, with a spacing of 210 to 250 mm between the welding lines, and take welding points on the welding lines, with a spacing of 180 to 220 mm between the welding points; Step 2: Make anchors and weld them to the welding points; Step 3: Support the mold in the secondary combustion chamber, use the anchor as the mold support point to support the mold, and then pour the mixed casting material into the gap between the mold and the inner wall of the secondary combustion chamber for casting. The mixed casting material includes a mixture and water, and the volume ratio of the mixture to water is 1:1-1.

2. The mixture includes a refractory castable and 2.5-3.5 cm thin steel wire, and the volume ratio of the refractory castable to the thin steel wire is 1:8-10. Step 4: After the casting is completed and solidified for 6 to 10 hours, the shaping mold is removed and the masonry is completed; The anchoring piece includes an inverted U-shaped bracket, a V-shaped support piece is provided at the upper middle portion of one side of the inverted U-shaped bracket, the top of each V-shaped support piece is provided with a support rod extending outward, and a short-circuit structure is provided in the middle of each support rod; After pasting 5-10mm thick asbestos board on the surface of the secondary combustion chamber, support the mold inside the secondary combustion chamber; The length of the anchor is 100-200 mm, and the pouring thickness is the same as the length of the anchor; The volume ratio of the mixture to water is 1:1.

1. The mixture includes refractory castables and 3 cm thin steel wires. The volume ratio of the refractory castables to the thin steel wires is 1:

9. A rotary anode furnace body is provided on one side of the secondary combustion chamber. The rotary anode furnace body and the secondary combustion chamber are connected through a sub-flue. The sub-flue is rotatably connected to the secondary combustion chamber. A ash cleaning port is provided on the side of the secondary combustion chamber away from the sub-flue.

2. A masonry method for increasing the service life of a secondary combustion chamber of a rotary anode furnace according to claim 1, characterized in that: The V-shaped support member and the support rod are integrally formed, the inverted U-shaped shaping bracket and the V-shaped support member are welded, and the support rod and the short-circuit structure are welded.

3. A masonry method for increasing the service life of a secondary combustion chamber of a rotary anode furnace according to claim 2, characterized in that: The anchor is made of stainless steel.

4. The masonry method for increasing the service life of the secondary combustion chamber of a rotary anode furnace according to claim 2, characterized in that: Apply asphalt paint to the surface of the anchor.

5. The masonry method for increasing the service life of the secondary combustion chamber of a rotary anode furnace according to claim 1, characterized in that: The spacing between welding lines is 230 mm, and welding points are taken on the welding lines, with a spacing of 200 mm between welding points.

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