Blast furnace molten iron tank

Abstract

The utility model relates to a blast furnace hot-metal bottle which comprises an outer shell layer, a hot-metal bottle cover layer, a hot-metal bottle cover layer, a hot-metal bottle cover layer, a hot-metal bottle cover layer, a hot-metal bottle cover layer and a hot-metal bottle cover layer, the sealing mechanism comprises a first permanent layer, a first working layer, a second permanent layer, an impact layer and a second working layer, the first permanent layer and the first working layer sequentially cover the interior of the side wall from outside to inside, the second permanent layer covers the bottom wall, the impact layer and the second working layer cover the second permanent layer, and the impact layer is arranged in the middle of the bottom wall; the second working layer is arranged on the periphery of the impact layer in a surrounding mode and connected to the first working layer in a sealed mode, the height of the impact layer is larger than that of the second working layer, and sealing layers are filled between the working layers and the permanent layer. Through the arrangement, the use frequency of the hot-metal bottle is prolonged to 1080 + / -20 times, and the service life of the hot-metal bottle is greatly prolonged, so that the production rhythm of iron and steel enterprises is guaranteed, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of metallurgical equipment, in particular to a blast furnace molten iron tank. Background Art

[0002] The iron and steel smelting industry is a high-risk industry. The high-temperature molten metal smelted in the blast furnace is a dangerous source that needs to be focused on. The temperature of high-temperature molten iron is about 1500℃, and its transportation equipment is particularly important and needs to be focused on. At present, the more commonly used way to transport molten iron is rail transportation, and the equipment for holding molten iron is molten iron tanks. Due to the high density, high temperature and strong corrosiveness of blast furnace molten iron, molten iron trains and molten iron tanks are required to have a weight bearing capacity of 150-200 tons. Molten iron falls from a 7-meter molten iron ditch and flows into the molten iron tank, which requires the interior of the molten iron tank to be resistant to erosion, high temperature and corrosion.

[0003] Traditional molten iron ladle has a short service life. The molten iron impact zone, the gap between the tank wall brick lining and the permanent layer, and the tank wall brick lining door position are easily corroded and penetrated. It can only hold more than 700 loads before it needs to be taken offline for repair. After repair, it can only reach a cumulative service cycle of more than 800 times before it needs to be taken offline for major overhaul or scrapped. The overall service life is short, which affects the production rhythm and production cost of steel enterprises. In addition, molten iron leakage may occur, resulting in the risk of fire or explosion, endangering the safety of life and property of the enterprise. Utility Model Content

[0004] To this end, the technical problem to be solved by the utility model is to overcome the problem in the prior art that the molten iron impact zone, the gap between the tank wall brick lining and the permanent layer, and the tank wall brick lining joint door position are easily corroded and penetrated, and can only be filled for more than 700 times and need to be taken offline for repair, thereby providing a blast furnace molten iron tank.

[0005] In order to solve the above technical problems, the utility model provides a blast furnace molten iron ladle, comprising:

[0006] The outer shell layer comprises: a side wall and a bottom wall, wherein the side wall and the bottom wall enclose a receiving space;

[0007] A sealing mechanism comprises: a first permanent layer and a first working layer covering the inside of the side wall, a second permanent layer covering the bottom wall, an impact layer and a second working layer covering the second permanent layer, the impact layer being arranged in the middle of the bottom wall, the second working layer being arranged around the impact layer and being sealed to the first working layer, the impact layer being higher than the second working layer, and a sealing layer being filled between the working layer and the permanent layer.

[0008] In one embodiment of the utility model, the first working layer and the second working layer are both brick layers, the first permanent layer and the second permanent layer are both refractory casting layers, and the first permanent layer and the second permanent layer respectively fill the gap between the first working layer and the second working layer to form a sealing layer.

[0009] In one embodiment of the utility model, at least two ear shafts are respectively arranged on the outer peripheral side of the outer shell layer, the first working layer starts at one ear shaft and closes at the other ear shaft, the first working layer is a layer-by-layer closing door and the positions of the adjacent upper and lower layers are staggered.

[0010] In one embodiment of the utility model, the number of bricklaying layers of the first working layer is 24-32 layers, and the first permanent layer is poured after each one or more layers of the first working layer are laid, and the height of the first permanent layer is lower than the first working layer each time the first permanent layer is poured.

[0011] In one embodiment of the present invention, the thickness of the second working layer is 200 mm-230 mm, the thickness of the impact layer is 270 mm-350 mm, and the second working layer is a single brick layer.

[0012] In one embodiment of the present invention, when the width of the closing door of the first working layer is less than 40 mm, the number of closing bricks is two, and a non-processed brick is arranged between the two closing bricks.

[0013] In one embodiment of the utility model, the first working layer includes at least two types of bricks, and the first permanent layer is poured after every four layers of the first working layer are built. The height of the first permanent layer is 30-50mm lower than the first working layer each time the first permanent layer is poured, and the brick joints of the second working layer are not greater than 1.5mm.

[0014] In one embodiment of the utility model, two adjacent bricks of the second working layer are arranged one front and one back, and the gaps between the second working layer and the second permanent layer, and between the bricks of the second working layer are filled with a sealing medium, and the sealing medium is a high temperature resistant material.

[0015] In one embodiment of the utility model, the outer shell layer is welded with an anchor for fixing the can mouth, and the can mouth fetal membrane is placed on the bricks of the uppermost first working layer.

[0016] In one embodiment of the present invention, the side wall is a cylindrical structure, the bottom wall is a flat bottom structure, the opening size of the accommodating space is larger than the size of the bottom wall, and the cylindrical structure gradually narrows from the opening side to the bottom wall.

[0017] The above technical solution of the utility model has the following advantages compared with the prior art:

[0018] The utility model discloses a blast furnace molten iron tank, which forms a tank support body through an outer shell layer, wherein the outer shell layer is a steel plate layer, and the first permanent layer and the first working layer respectively cover the inside of the side wall of the outer shell layer to form a double-layer sealing structure. The molten iron in the tank is insulated by the first working layer and the second working layer, and a sealing filling structure is formed between the first working layer and the second working layer respectively by the first permanent layer and the second permanent layer to prevent the molten iron in the tank from penetrating and leaking. The impact layer and the second working layer are provided, and the height of the impact layer is greater than the second working layer, so that the impact resistance of the molten iron impact zone can be enhanced, and the gap between the working layer and the permanent layer can be eliminated in cooperation with the sealing layer, so as to extend the number of times the molten iron tank is used to 1080±20 times, which greatly increases the service life of the molten iron tank, thereby ensuring the production rhythm of the steel enterprise and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein

[0020] Figure 1 It is the front view of the tank body of the utility model;

[0021] Figure 2 It is a cross-sectional view of the tank body of the utility model;

[0022] Figure 3 It is a schematic diagram of the tank bottom masonry layer of the utility model;

[0023] Figure 4 It is a schematic diagram of the tank wall masonry layer of the utility model.

[0024] Explanation of the reference numerals in the specification: 1. outer shell layer; 101. side wall; 102. bottom wall; 2. nozzle; 3. ear axis; 4. first permanent layer; 5. first working layer; 6. accommodation space; 7. molten iron liquid level; 8. second permanent layer; 9. second working layer; 10. impact layer. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0026] Example

[0027] Reference Figure 1-4 As shown, a blast furnace iron ladle of the utility model comprises:

[0028] The outer shell layer 1 comprises: a side wall 101 and a bottom wall 102, wherein the side wall 101 and the bottom wall 102 enclose a receiving space 6;

[0029] The sealing mechanism comprises: a first permanent layer 4 and a first working layer 5 covering the inside of the side wall 101 in sequence from the outside to the inside, a second permanent layer 8 covering the bottom wall 102, an impact layer 10 and a second working layer 9 covering the second permanent layer 8, the impact layer 10 being arranged in the middle of the bottom wall 102, the second working layer 9 being arranged around the impact layer 10 and being sealed to the first working layer 5, the height of the impact layer 10 being greater than that of the second working layer 9, and a sealing layer being filled between the working layer and the permanent layer.

[0030] A blast furnace molten iron tank described in the utility model comprises an outer shell layer 1 forming a tank body support, the outer shell layer 1 is a steel plate layer, a first permanent layer 4 and a first working layer 5 respectively cover the inside of a side wall 101 of the outer shell layer 1 to form a double-layer sealing structure, the molten iron in the tank is insulated by the first working layer 5 and the second working layer 9, the first permanent layer 4 and the second permanent layer 8 are respectively formed to form a sealing filling structure between the first working layer 5 and the second working layer 9 to prevent the molten iron in the tank from penetrating and leaking, the impact layer 10 and the second working layer 9 are provided, and the height of the impact layer 10 is greater than the second working layer 9, so that the impact resistance of the molten iron impact zone can be enhanced, and the gap between the working layer and the permanent layer is eliminated by the provided sealing layer, thereby extending the number of times the molten iron tank is used to 1080±20 times.

[0031] The specific casting plan is as follows: 1. Prepare the steel shell, prepare a steel plate with a thickness of 20.5±3mm, and weld the outer shell of the molten iron tank of corresponding size, including the ear shaft 3 and the tank mouth 2.

[0032] 2. Casting of permanent lining bottom of molten iron tank: The thickness of permanent lining bottom is about 150±20mm. Add high aluminum casting material into the mixer, including small bags of binder. The amount of one-time mixing depends on the capacity of the mixer, usually not more than 80% of the rated capacity. The casting material is first dry mixed for 2-3 minutes. According to the performance of the casting mud, the amount of water added is 6-8%. The casting material is wet mixed for 5-8 minutes, and the material can be discharged after the mud reaches the construction performance. Add the mixed mud evenly to the bottom of the tank, and immediately vibrate and compact it with a vibrator until the material surface is slurry. When adding the second material, if the previous casting material has not yet set, you can add the material directly. If the upper layer has already set, the upper layer of the material surface should be scraped so that the two layers of casting material can be fully combined. Repeat the above process until the tank bottom is poured to the appropriate thickness. The tank bottom casting material must be naturally cured (at room temperature) for more than 24 hours, and construction can continue after it has load-bearing strength.

[0033] 3. The thickness of the permanent lining of the molten iron tank is 90mm. The lining material at the bottom of the tank can be poured while the lining is built after the lining material has the load-bearing strength. Figure 3As shown, the first layer of masonry is cast from section A and the castable material casting process is carried out. The permanent lining tank wall is cast once every 4 layers, i.e. 400mm high. In order to avoid the formation of through seams, the casting height should be 30-50mm lower than the masonry height.

[0034] 4. Lay the working lining bricks on the tank bottom along the center line of the trunnion 3AB end (perpendicular to the tank mouth 2 direction). The first brick of the first row starts from the A end, and the adjacent two rows start from the B end. The adjacent two rows of bricks cannot be re-sewn, and so on, to ensure that the two adjacent rows of door bricks are not in the same direction. Check the permanent layer of the tank bottom. If it is uneven, it must be leveled or repaired. Each brick must be leveled, close together, and pried firmly. The brick seam should not be larger than 1.5mm. The brick surface must be flat during masonry, and there should be no obvious steps between bricks.

[0035] like Figure 2 As shown, the distance between the molten iron liquid level 7 and the top of the accommodating space 6 is 750 mm, the outer diameter of the tank bottom is 3065 mm, and the inner diameter of the tank bottom is 2544 mm.

[0036] See also Figure 2-Figure 4 As shown, the first working layer 5 and the second working layer 9 are both brickwork layers, the first permanent layer 4 and the second permanent layer 8 are both refractory casting layers, the first permanent layer 4 and the second permanent layer 8 are respectively filled in the gap between the first working layer 5 and the second working layer 9 to form a sealing layer, the first working layer 5 and the second working layer 9 are both brickwork layers, made of refractory bricks, the gap between the first working layer 5 and the second working layer 9 is filled with a metal solution, the metal solution forms a sealing layer after solidification, and ensures the sealing performance of the molten iron tank, in this embodiment, the metal solution is a high-aluminum casting material, when the molten iron is poured into the molten iron tank, the first contact is the impact layer 10, the impact force of the molten iron is absorbed by the impact layer 10, and the direct impact on the bottom wall 102 is reduced. The molten iron then flows in the accommodating space 6, constrained by the first working layer 5 and the second working layer 9.

[0037] See also Figure 1-Figure 2 As shown, at least two ear shafts 3 are respectively arranged on the outer peripheral side of the shell layer 1, the first working layer 5 starts at one ear shaft 3 and closes at the other ear shaft 3, the first working layer 5 is a layer-by-layer closing door and the positions of the adjacent upper and lower layers are staggered, and the ear shafts 3 are arranged to facilitate the hoisting of the molten iron tank, the tank wall working lining bricks start at the A end, the closing door is at the B end, the layer-by-layer closing door, the positions of the adjacent upper and lower layers must be staggered by a certain position, and the upper and lower brick seams must be staggered. When each layer of bricks is laid to the last 2 to 3 blocks, a steel tape measure should be used to measure the size of the remaining section to determine the processing size of the closing bricks.

[0038] The number of brick layers of the first working layer 5 is 24-32. Taking a 90t molten iron tank as an example, the working lining tank wall of the 90t molten iron tank is built with a mixed brick structure of ZZF-7 (150×150 / 138×100) (unit: mm) and ZZF-8 (150×150 / 126×100) (unit: mm). In this embodiment, a total of 28 layers are built, and after the tank bottom castable has load-bearing strength, the bricks are built while pouring. The first permanent layer is poured every four layers. The height of a single brick of the tank wall is 100mm, that is, the height of the brick is 400mm, and the height of the first permanent layer is 30-50mm lower than the first working layer each time it is poured, thereby avoiding the formation of through seams.

[0039] The thickness of the second working layer 9 is 200mm-230mm, the thickness of the impact layer 10 is 270-350mm, the second working layer 9 is a single-layer brickwork layer, in this embodiment, the gap between the tank bottom and the tank wall is filled with castables, and the impact area of ​​the working lining tank bottom of the molten iron tank adopts NGD-1 (300×200×100) (unit: mm) brick type flat masonry 1 layer, with a total thickness of 300mm, so that the tank bottom can withstand the impact of 7-meter high-temperature molten iron free fall for a long time. The non-impact area of ​​the working lining tank bottom adopts JN1-2 (250×200×100) (unit: mm) brick type flat masonry 1 layer, with a total thickness of 250mm.

[0040] When the width of the door opening of the first working layer 5 is less than 40mm, the number of door bricks is two, and a non-processed brick is placed between the two door bricks. If two door bricks must be processed, the two door bricks cannot be used together, and a non-processed brick must be sandwiched in the middle. The door bricks should be measured according to the width of the closing and cut on a brick cutting machine. If the minimum width of the door opening is less than 40mm, two door bricks should be used to close the opening.

[0041] The first working layer 5 includes at least two types of bricks, the brick joints of the second working layer 9 are no larger than 1.5 mm, and during the masonry process, more than two types of bricks are used for mixed masonry, the brick joints are no larger than 1.5 mm, and there should be no obvious misalignment on the inner wall of each layer of bricks.

[0042] The two adjacent bricks of the second working layer 9 are arranged one front and one back, and the gaps between the second working layer 9 and the second permanent layer 8, as well as between the bricks of the second working layer 9, are filled with a sealing medium. The sealing medium is a high temperature resistant material. Since the bricks themselves have a brick-out degree, in order to avoid the existence of triangular seams, the two adjacent bricks are laid one front and one back. Each brick should be leveled, pressed together, and pried firmly. In this embodiment, the sealing medium is fire mud. The gaps between the working lining and the permanent lining, as well as between the bricks, are filled with fire mud. The fire mud is stirred with water and must be completely and fully blended with water. If there is still clumping dry material, it is prohibited. The fire mud is applied to the surface of the material, and it is better not to flow quickly.

[0043] The outer shell layer 1 is welded with anchors for fixing the can mouth 2. The can mouth 2 membrane is placed on the bricks of the first working layer 5 on the top layer. After checking the welding position of the anchors of the molten iron tank can mouth 2 and the welding is firm, the can mouth 2 is poured as a whole and placed on the 28th layer of bricks to ensure that the gap between the steel shell and the membrane is consistent. Add high-aluminum castables into the mixer, containing a small bag of binder. The one-time mixing amount depends on the capacity of the mixer, usually not exceeding 80% of the rated capacity. The castable is first dry mixed for 2 to 3 minutes, and the amount of water added is 6 to 8% according to the performance of the castable mud. The castable is wet mixed for 5 to 8 minutes again, and the mud can be discharged after it reaches the construction performance. Pour the mixed mud evenly into the mold cavity, and immediately vibrate and compact it evenly around the tank wall with a vibrator until the material surface is slurry. When adding the second material, if the previous castable has not yet set, it can be added directly. If the previous layer has already shown initial setting, the surface of the previous layer should be shaved so that the two layers of castables can be fully combined. Repeat the above process until the tank wall is poured to an appropriate height. When pouring the tank mouth 2 twice, the construction is difficult because the tank mouth 2 is relatively high and the castable is fluid. In order to facilitate construction, the amount of water added to the castable needs to be controlled. After the castable has initial setting strength, the permanent lining membrane can be pulled up a little. After the castable has been cured for 24 hours, its strength can meet the demoulding requirements and the mold can be completely pulled out. The construction of the tank mouth 2 is completed.

[0044] See also Figure 1-Figure 2 As shown, the side wall 101 is a cylindrical structure, the bottom wall 102 is a flat bottom structure, the opening size of the accommodating space 6 is larger than the size of the bottom wall 102, and the cylindrical structure gradually narrows from the opening side to the bottom wall 102, so that the molten iron tank is expanded to facilitate the outflow and collection of molten iron, and at the same time facilitate the replacement of the masonry layer during overhaul.

[0045] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A blast furnace iron ladle, characterized in that: include: The outer shell layer comprises: a side wall and a bottom wall, wherein the side wall and the bottom wall enclose a receiving space; A sealing mechanism comprises: a first permanent layer and a first working layer covering the inside of the side wall, a second permanent layer covering the bottom wall, an impact layer and a second working layer covering the second permanent layer, the impact layer being arranged in the middle of the bottom wall, the second working layer being arranged around the impact layer and being sealed to the first working layer, the impact layer being higher than the second working layer, and a sealing layer being filled between the working layer and the permanent layer.

2. A blast furnace iron ladle according to claim 1, characterized in that: The first working layer and the second working layer are both brick layers, the first permanent layer and the second permanent layer are both refractory casting layers, and the first permanent layer and the second permanent layer respectively fill the gap between the first working layer and the second working layer to form a sealing layer.

3. A blast furnace iron ladle according to claim 2, characterized in that: At least two ear shafts are respectively arranged on the outer peripheral side of the outer shell layer, the first working layer starts at one ear shaft and closes at the other ear shaft, the first working layer is a layer-by-layer closing door, and the positions of the adjacent upper and lower layers of the door are staggered.

4. The blast furnace iron ladle according to claim 1, characterized in that: The number of bricklaying layers of the first working layer is 24-32 layers, and the first permanent layer is poured after each one or more layers of the first working layer are laid, and the height of the first permanent layer is lower than the first working layer each time the first permanent layer is poured.

5. A blast furnace iron ladle according to claim 1 or 4, characterized in that: The thickness of the second working layer is 200mm-230mm, the thickness of the impact layer is 270-350mm, and the second working layer is a single brick layer.

6. The blast furnace iron ladle according to claim 1, characterized in that: When the width of the closing door of the first working layer is less than 40 mm, the number of closing bricks is two, and a non-processed brick is arranged between the two closing bricks.

7. The blast furnace iron ladle according to claim 4, characterized in that: The first working layer includes at least two types of bricks. The first permanent layer is poured after every four layers of the first working layer are built. The height of the first permanent layer is 30-50mm lower than the first working layer each time. The brick joints of the second working layer are not larger than 1.5mm.

8. The blast furnace iron ladle according to claim 7, characterized in that: Two adjacent bricks of the second working layer are arranged one front and one back, and the gaps between the second working layer and the second permanent layer and between the bricks of the second working layer are filled with a sealing medium, which is a high temperature resistant material.

9. The blast furnace iron ladle according to claim 1, characterized in that: Anchors for fixing the can mouth are welded to the outer shell layer, and the can mouth fetal membrane is placed on the bricks of the uppermost first working layer.

10. The blast furnace iron ladle according to claim 1, characterized in that: The side wall is a cylindrical structure, the bottom wall is a flat bottom structure, the opening size of the accommodating space is larger than the size of the bottom wall, and the cylindrical structure gradually narrows from the opening side to the bottom wall.

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