A method of lining a converter flat hearth

Abstract

The invention discloses a kind of laying methods of converter flat hearth bottom, in the laying process, take magnesium-carbon brick to be laid in the form of straight brick, and the laying direction is formed with 30 °-60 ° angle with the center line of trunnion of converter, and is laid on the second permanent layer to form working layer, and take magnesium-carbon brick to be laid in the form of ring on the outside of working layer, and after each layer is laid, it is between furnace shell and is tamped and beaten, and after filling tamping material, it forms reverse flat layer, and tamping and beating construction or pump injection construction is carried out between reverse flat layer and working layer, and after filling joint material, the laying work of converter flat hearth bottom is completed, the laying method of magnesium-carbon brick straight brick stacking can increase the friction between magnesium-carbon brick on movable hearth, and the laying of magnesium-carbon brick on hearth is carried out in the form that brick joint is 30 °-60 ° angle with the direction of trunnion, which is beneficial to improve the expansibility of bottom blowing brick, increase friction, and has great positive effect on preventing brick from falling during furnace shaking, improve safety, and the flexibility of maintenance operation of movable hearth is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of converter construction methods, and in particular to a method for laying a flat hearth of a converter. Background Art

[0002] The information provided in this section is for the purpose of generally presenting the background of the present disclosure. To the extent described in this section, the work of the presently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly admitted to be prior art to the present disclosure.

[0003] The traditional converter flat bottom masonry is based on the center position of the furnace bottom. The center bricks are pre-laid in a circle aligned with the center point. After one circle is laid, the second circle is laid. The disadvantage of this method is that it is easy to generate high-intensity thermal stress near the center, and door bricks must be used when closing each circle of bricks, especially near the bottom blowing vents where a large amount of bricks are cut. When the converter rotates and stands upside down, the bricks on the furnace bottom are prevented from falling off by extrusion stress and friction. However, if the masonry joints are large or the bricks expand and contract, causing the brick joints to widen, the bricks will easily become loose, which can easily cause bricks to fall off. If the converter bottom and molten pool transition bricks are laid from the furnace bottom to the molten pool, so that the central axis of the converter bottom and molten pool transition bricks can be perpendicular to the direction of the converter shell, this method still has the problem of inconvenience in maintenance due to the different erosion rates of the furnace bottom and the molten pool. Summary of the Invention

[0004] In view of the defects existing in the prior art, the present application provides a method for laying the flat hearth of a converter to solve the problems of low safety and complicated maintenance during the laying of the flat hearth of a converter in the prior art.

[0005] The above-mentioned purpose of this application is mainly achieved through the following technical solutions:

[0006] A masonry method for a converter flat hearth, comprising:

[0007] Take the bottom blowing seat brick and place it at the target position, and install the positioning dummy gun;

[0008] Locate the center of the converter, build the first permanent layer from the center to the surrounding areas, and then build the second permanent layer on the first permanent layer with staggered joints;

[0009] The magnesia carbon bricks are stacked in straight strips and laid on the second permanent layer in a laying direction that forms an angle of 30° to 60° with the center line of the converter trunnion to form a working layer;

[0010] Take magnesia carbon bricks and lay them in a circular manner layer by layer outside the working layer. After each layer is laid, ramming is performed between the end away from the working layer and the furnace shell, and ramming material is filled in to form an anti-flat layer.

[0011] Between the reverse layer and the working layer, the joint material is filled by ramming construction or pump injection construction.

[0012] Further, the first permanent layer and the second permanent layer are respectively built in a cross manner.

[0013] Further, the first permanent layer and the second permanent layer are built in a 90° staggered manner.

[0014] Further, when the working layer is built on the second permanent layer, the magnesite carbon brick is rotated 30°-60° based on the converter trunnion center line, and the starting brick is built from the bottom blowing inside, and the staggered building is performed.

[0015] Further, the furnace shell and the first permanent layer, the second permanent layer and the working layer, and the adjacent magnesite carbon bricks in the working layer are all smeared with an adhesive.

[0016] Further, the thickness of the adhesive is not more than 0.5mm, and the fullness of the adhesive is not less than 90%.

[0017] Further, when the working layer is built, the magnesite carbon bricks in each row are built to be 80mm-120mm away from the reverse layer, and are supported and fixed by a support, and after the working layer is built, 2-4 fastening steel belts are used for overall fixation, and the support is removed when the reverse layer is built.

[0018] Further, when the reverse layer is built in a ring shape, the door is combined on both sides of the trunnion, and the door bricks in each layer are staggered by at least 5 brick distances, and the working surface of the door brick is not less than 40mm.

[0019] Further, after the second permanent layer is built, the furnace bottom is leveled, and the center position of the furnace bottom is determined by the line.

[0020] Further, when the furnace bottom is leveled, the slurry formed by mixing magnesia powder and glue is used for leveling.

[0021] Compared with the prior art, the application has the following advantages:

[0022] The application places the bottom blowing seat brick in the target position, installs the positioning dummy gun, positions the center position of the converter, then builds the first permanent layer from the center position to the periphery, builds the second permanent layer on the first permanent layer in staggered joints, then builds the working layer on the second permanent layer by taking the magnesite carbon brick in the form of straight brick stacking and adopting the building direction forming an angle of 30-60 degrees with the center line of the trunnion of the converter, and builds the working layer on the outside of the working layer layer by layer by taking the magnesite carbon brick, and after each layer of building is completed, the tamping construction between the furnace shell is carried out, the tamping material is filled to form the reverse flat layer, the tamping construction or pump injection construction is carried out between the reverse flat layer and the working layer, the joint material is filled to complete the building operation of the flat hearth bottom of the converter, and the building method of the magnesite carbon brick in the form of straight brick stacking can increase the friction between the magnesite carbon bricks on the movable hearth bottom, the building of the magnesite carbon bricks on the hearth bottom is carried out in the form that the brick joints form an angle of 30-60 degrees with the direction of the trunnion, compared with the form that the brick joints are parallel to the direction of the trunnion, which is beneficial to improving the expansibility of the bottom blowing bricks, increasing the friction, having a great positive effect on preventing the bricks from falling during the furnace shaking, improving the safety, and greatly improving the flexibility of the maintenance operation of the movable hearth bottom. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0024] Figure 1 The flow chart of the building method is provided for the embodiments of the present application.

[0025] Figure 2 The cross-sectional view of the flat hearth bottom of the converter is provided for the embodiments of the present application.

[0026] Figure 3 The plan view of the flat hearth bottom of the converter is provided for the embodiments of the present application.

[0027] In the figure: 100, furnace shell; 200, bottom blowing seat brick; 300, first permanent layer; 400, second permanent layer; 500, working layer; 600, reverse flat layer; 700, tamping material; 800, joint material. DETAILED DESCRIPTION

[0028] The present application will be further described below in conjunction with the drawings and specific embodiments. It should be noted that the description of these embodiment modes is used to help understand the present application, but does not constitute a limitation on the present application. The specific structural and functional details disclosed herein are only used to describe the example embodiments of the present application. However, the present application can be embodied in many alternative forms, and should not be understood as being limited in the embodiments set forth herein.

[0029] Figure 1 A flowchart of a masonry method is provided for an embodiment of the present application. Figure 2 A cross-sectional view of the bottom of a converter is provided for the embodiment of the present application. Figure 3 A top view of the bottom of a converter is provided for an embodiment of the present application.

[0030] like Figure 1 As shown, a masonry method for a converter flat hearth, the masonry method comprising:

[0031] Take the bottom blowing seat brick 200 and place it at the target position, and install the positioning dummy gun;

[0032] Locate the center of the converter, build the first permanent layer 300 from the center to the surrounding areas, and then build the second permanent layer 400 on the first permanent layer 300 in a staggered manner;

[0033] Magnesia carbon bricks are stacked in straight strips and laid on the second permanent layer 400 in a laying direction that forms an angle of 30° to 60° with the center line of the converter trunnion to form a working layer 500;

[0034] Take magnesia carbon bricks and lay them in a circular manner layer by layer outside the working layer 500. After each layer is built, ramming is performed between the end away from the working layer 500 and the furnace shell 100, and ramming material 700 is filled to form an anti-leveling layer 600.

[0035] The joint material 800 is filled between the anti-leveling layer 600 and the working layer 500 by ramming or pumping.

[0036] Combined with Figure 2 and Figure 3As shown, the working principle of this embodiment is as follows: by taking the bottom blowing seat brick 200 and placing it at the target position, and installing the positioning dummy gun, after locating the center position of the converter, the first permanent layer 300 is sequentially built from the center position to the surrounding areas, and the second permanent layer 400 is staggered on the first permanent layer 300, and then the magnesia carbon bricks are stacked in a straight brick manner and the masonry direction is formed at an angle of 30° to 60° with the center line of the converter ear axis to form a working layer 500 on the second permanent layer 400, and the magnesia carbon bricks are layered and annularly laid on the outside of the working layer 500, and after each layer is completed, ramming construction is carried out between the furnace shell 100, and the ramming is filled. After 700 of material is added, an anti-leveling layer 600 is formed. Ramming construction or pumping construction is carried out between the anti-leveling layer 600 and the working layer 500. After filling the joint material 800, the masonry work of the converter flat bottom is completed. The masonry method of stacking magnesia carbon bricks in straight strips can increase the friction between the magnesia carbon bricks on the movable furnace bottom. The masonry of the magnesia carbon bricks at the furnace bottom is carried out in a way that the brick seams are 30° to 60°at an angle to the ear axis direction. Compared with the way that the brick seams are parallel to the ear axis direction, it is beneficial to improve the expansion of bottom-blown bricks, increase friction, and play a great positive role in preventing bricks from falling when shaking the furnace, thereby improving safety. The movable furnace bottom greatly improves the flexibility of maintenance operations.

[0037] Furthermore, based on the above embodiment, the first permanent layer 300 and the second permanent layer 400 are respectively built in a cross-shaped manner to improve the stability of the building. After the bottom-blown seat bricks 200 are first set, the bottom-blown seat bricks 200 are used as the starting point for building and the building work is carried out in all directions, which facilitates the construction work and also improves the integrity and consistency of the first permanent layer 300 and the second permanent layer 400.

[0038] Furthermore, based on the above embodiment, the first permanent layer 300 and the second permanent layer 400 are laid with a 90° staggered joint. After the construction of the first permanent layer 300 and the second permanent layer 400 is completed, the laying effect can improve the overall structural performance, avoid concentrated and penetrating structural defects, and improve the stability of the converter operation.

[0039] like Figure 3 As shown, further, on the basis of the above embodiment, when the working layer 500 is formed on the second permanent layer 400, the magnesia carbon bricks are rotated 30° to 60° with the center line of the converter ear axis as the reference, and the starting bricks are laid from the inner side of the bottom blowing, and staggered laying is performed. Specifically, in order to achieve the laying direction that forms an angle of 30° to 60° with the center line of the converter ear axis, the magnesia carbon bricks are rotated 30° to 60° with the center line of the converter ear axis as the reference and then laid to maintain the brick joints of the magnesia carbon bricks in the working layer 500 to form an angle of 30° to 60° with the center line of the converter ear axis. The operation is simple and the consistency is strong.

[0040] Furthermore, based on the above embodiments, adhesive is applied between the furnace shell 100 and the first permanent layer 300, between the second permanent layer 400 and the working layer 500, and between adjacent magnesia-carbon bricks in the working layer 500 to increase the friction between adjacent structures, improve the overall structural stability, and further prevent bricks from falling when shaking the furnace.

[0041] Furthermore, based on the above embodiment, the thickness of the adhesive is not greater than 0.5 mm, and the fullness of the adhesive is not less than 90%. The adhesive in this state can effectively exert bonding performance and increase friction while avoiding increasing the active position between adjacent magnesia carbon bricks.

[0042] Furthermore, on the basis of the above embodiment, when the working layer 500 is laid, each row of magnesia carbon bricks is laid to a distance of 80 mm to 120 mm from the anti-leveling layer 600, and is supported and fixed with support members. After the working layer 500 is laid, 2 to 4 fastening steel belts are taken out for overall fixation, and the support members are taken out when the anti-leveling layer 600 is laid. Since the working layer 500 and the anti-leveling layer 600 are laid independently, in order to ensure that the working layer 500 and the anti-leveling layer 600 do not interfere with each other and are independent and stable during the laying process, support members are added to keep the working layer 500 stable. At the same time, after the working layer 500 is laid, it is fixed as a whole by fastening steel belts, which avoids the working layer 500 from tipping over or deflecting and affecting the anti-leveling layer 600, and avoids the gap between the anti-leveling layer 600 and the working layer 500 from being uneven, thereby facilitating the ramming construction or pumping construction between the anti-leveling layer 600 and the working layer 500 and filling the joint material 800.

[0043] Furthermore, based on the above embodiment, when the anti-leveling layer 600 is laid in a circular shape, the door is closed on both sides of the ear axis, and the door bricks of each layer are staggered by at least 5 bricks, and the working surface of the door bricks is not less than 40 mm, thereby increasing the stability of the anti-leveling layer 600 during construction.

[0044] Furthermore, based on the above embodiment, after the second permanent layer 400 is built, the furnace bottom is leveled and the center position of the furnace bottom is determined by laying out.

[0045] Furthermore, based on the above embodiment, when leveling the furnace bottom, slurry formed by mixing magnesia powder and glue is used for leveling.

[0046] In actual operation, the masonry of the converter flat hearth can be carried out according to the following steps:

[0047] Take the bottom blowing seat brick 200 and place it at the target position, and install the positioning dummy gun;

[0048] Positioning the center position of the converter, after laying the first permanent layer 300 in a cross shape around the center position, laying the second permanent layer 400 in a cross shape staggered on the first permanent layer 300, the adhesive is applied between the furnace shell 100 and the first permanent layer 300, the thickness of the adhesive is 0.3mm, and the fullness is 95%;

[0049] The mortar formed by mixing magnesium sand powder and glue is used for leveling the furnace bottom, and the center position of the furnace bottom is determined by setting out the line. The magnesite carbon bricks are laid in a straight brick manner, and the magnesite carbon bricks are rotated by 45° based on the center line of the trunnion of the converter, and then laid on the second permanent layer 400 in the laying direction to form the working layer 500. When each row of magnesite carbon bricks is laid to a distance of 100mm from the reverse layer 600, a support member is used for supporting and fixing. The adhesive is applied between the second permanent layer 400 and the working layer 500 and between the adjacent magnesite carbon bricks in the working layer 500, the thickness of the adhesive is 0.3mm, and the fullness is 95%. After the working layer 500 is laid, three fastening steel belts are used for overall fixing.

[0050] The magnesite carbon bricks are taken out, and the annular laying is performed layer by layer outside the working layer 500. After each layer is laid, the tamping construction is performed between the end away from the working layer 500 and the furnace shell 100, and the reverse layer 600 is formed after the tamping material 700 is filled. The door bricks are kept on both sides of the trunnion, and each layer of door bricks is staggered by at least 5 brick distances. The working surface length of the door bricks is 50mm, and the support member is taken out.

[0051] The tamping construction is performed between the reverse layer 600 and the working layer 500, and the joint material 800 is filled to complete the laying of the converter flat bottom.

[0052] It should be understood that the terms first, second, etc. are only used to distinguish description, and cannot be understood as indicating or implying relative importance. Although the terms first, second, etc. can be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another unit. For example, the first unit can be called the second unit, and similarly the second unit can be called the first unit, without departing from the scope of the example embodiments of the present application.

[0053] It should be understood that the term "and / or" herein only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, B alone, and A and B together. The term "and" herein describes another association relationship of the associated objects, which means that there can be two relationships, for example, A and B, which means that there are two cases of A alone and A and B together. In addition, the character " / " herein generally represents an "or" relationship between the associated objects.

[0054] It should be understood that, in the description of the present application, the orientation or positional relationship indicated by the terms "upper", "vertical", "inner", "outer" and the like is the orientation or positional relationship when the disclosed product is usually placed, or the orientation or positional relationship commonly understood by those skilled in the art, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0055] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arranged", "mounted", "connected" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit example embodiments of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", when used herein, specify the presence of stated features, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0057] In the following description, specific details are provided to facilitate a thorough understanding of example embodiments. However, those skilled in the art will understand that example embodiments can be practiced without these specific details. In other instances, well-known processes, structures and techniques have not been shown in detail in order to avoid obscuring example embodiments.

[0058] The above merely provides specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0059] It should be noted that the information disclosed in the Background section is only for the purpose of enhancing the understanding of the background of the present disclosure, and thus can include information that does not constitute prior art that is already known to those of ordinary skill in the art.

Claims

1. A method of lining a converter flat hearth, characterized in that, The masonry method comprises: placing a bottom-blowing base brick at a target position and installing a positioning dummy gun; positioning a converter center position, sequentially masonry a first permanent layer from the center position to the periphery, and then masonry a second permanent layer on the first permanent layer in a staggered manner; taking magnesite carbon bricks in a straight brick stacking manner, and masonry the bricks on the second permanent layer to form a working layer in a masonry direction forming an angle of 30-60° with the center line of the trunnion of the converter; taking magnesite carbon bricks, and performing annular masonry on the outside of the working layer layer by layer, and performing tamping construction between the working layer and the furnace shell at the end far from the working layer after each layer of masonry is completed, to form an anti-flat layer after filling tamping material; performing tamping construction or pump injection construction between the anti-flat layer and the working layer, and filling joint material.

2. The lining method of the converter flat hearth bottom according to claim 1, characterized in that: The first permanent layer and the second permanent layer are masonryed to the periphery in a cross manner respectively.

3. The method for laying the flat hearth of a converter according to claim 1, wherein: The first permanent layer and the second permanent layer are masonryed in a 90° staggered manner.

4. The lining method of the converter flat hearth bottom as claimed in claim 1, characterized in that: When the working layer is masonryed on the second permanent layer, the magnesite carbon bricks are rotated 30-60° based on the center line of the trunnion of the converter, the starting brick is masonryed from the inside of the bottom blowing, and the bricks are masonryed in a staggered manner.

5. The lining method of the converter flat hearth bottom as claimed in claim 1, characterized in that: The furnace shell and the first permanent layer, the second permanent layer and the working layer, and the adjacent magnesite carbon bricks in the working layer are all smeared with an adhesive.

6. The lining method of the converter flat hearth bottom as claimed in claim 5, characterized in that: The thickness of the adhesive is not more than 0.5 mm, and the fullness of the adhesive is not less than 90%.

7. The lining method of the converter flat hearth bottom as claimed in claim 1, characterized in that: When the working layer is masonryed, the magnesite carbon bricks in each row are masonryed to a distance of 80-120 mm from the anti-flat layer, are supported and fixed by a support, and after the working layer is masonryed, 2-4 fastening steel belts are used to fix the working layer as a whole, and the support is removed when the anti-flat layer is masonryed.

8. The lining method of the converter flat hearth bottom as claimed in claim 1, characterized in that: When the anti-flat layer is masonryed in an annular manner, the doors are arranged on both sides of the trunnion, the door bricks in each layer are staggered by at least a distance of 5 bricks, and the working surface of the door bricks is not less than 40 mm.

9. The lining method of the converter flat hearth bottom as claimed in claim 1, characterized in that: After the second permanent layer is masonryed, the furnace bottom is leveled, and the center position of the furnace bottom is determined by a line.

10. The method for laying the flat hearth of a converter according to claim 9, wherein: When the furnace bottom is leveled, a slurry formed by mixing magnesia powder and glue is used for leveling.

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