Converter live bottom magnesia carbon brick building method

Abstract

The invention provides a converter live bottom magnesia carbon brick building method, and belongs to the technical field of converter lining refractory material building construction. According to the method, a straight line building mode is adopted, and fire clay is smeared for construction. Specifically, the method comprises the following steps: firstly, determining the direction of a straight line and the size of the brick shape, reducing the brick shape of the furnace bottom brick, reducing the brick sawing trouble in the building process and improving the building efficiency, and independently building 4-18 air supply bricks at the furnace bottom in a linear arrangement manner; then, the width size of the furnace bottom brick is determined according to the diameter size of the furnace bottom and the size of the conventional production brick shape of the furnace bottom brick, and the thickness size of the furnace bottom brick is determined according to the distance between the air supply hole centers of the adjacent air supply bricks. According to the method, air supply bricks are arranged on two adjacent linear masonry rows respectively, the size of the brick shape is determined on the basis, and the thickness of fire clay needs to be reserved for design and calculation of the size of the brick shape. The brickwork obtained by the invention is higher in structural strength, and the construction efficiency is also improved.

Description

Technical Field

[0001] The invention belongs to the technical field of converter lining refractory material masonry construction, in particular to a converter live bottom magnesia carbon brick masonry method. Background Art

[0002] At present, the new intelligent steelmaking technology of bottom oxygen blowing and bottom powder spraying introduced by large converters has a rapid erosion of the refractory materials at the bottom of the converter. The refractory materials at the bottom of the converter need to be replaced many times during the entire converter smelting service to synchronize the life of the refractory materials in other parts. The refractory magnesium carbon bricks at the bottom of the converter generally adopt the dry masonry method, which causes the magnesium carbon bricks to expand due to heat and peel off; or during the period after steel tapping and before steel adding, the magnesium carbon brick refractory materials shrink in volume due to the reduction of furnace temperature, which will cause the bottom bricks to fall off during the shaking process of the converter smelting operation, and accidents such as steel penetration and leakage at the bottom of the furnace will occur. Analysis of the causes of this problem shows that in addition to the performance defects of the fire clay itself, there is also room for improvement in the masonry method. The masonry structure obtained by conventional masonry technology has a low structural strength, is prone to loosening, brick pulling and other problems, and the construction efficiency needs to be improved. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the conventional masonry method of magnesia-carbon bricks for the active bottom of a converter has a low structural strength of the masonry, is prone to loosening and brick pulling, and the construction efficiency needs to be improved.

[0004] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: A method for laying magnesia-carbon bricks for a converter active bottom comprises: arranging a plurality of air supply holes on the plane of the bottom of the furnace as positions of air supply bricks, and at the positions, each individual air supply brick forms a straight line arrangement with the bottom bricks in the shape of a straight line, adjacent bricks are aligned in the direction of the straight line, and adjacent bricks are staggered in the direction perpendicular to the straight line; and fire mud is provided between adjacent bricks.

[0005] Preferably, the number of the air supply bricks is 6, and each group of 2 air supply bricks is composed of 2 air supply bricks. The 2 air supply bricks in each group are respectively located in two adjacent rows of bricks, and each row of bricks is parallel to the straight line direction.

[0006] Preferably, the width of the furnace bottom brick is 150±10 mm and the thickness is 130±30 mm.

[0007] Preferably, the width dimension of the furnace bottom brick is determined according to the furnace bottom diameter dimension and the conventional production brick size of the furnace bottom brick (conventional brick width dimension is 150±10mm, thickness dimension is 130±30mm); the thickness dimension of the furnace bottom brick is determined according to the spacing between the air supply hole centers of adjacent air supply bricks.

[0008] Preferably, the oxygen blowing and powder spraying elements of the converter, i.e., the gas supply bricks, extend in a direction parallel to the straight line direction. It is required that the oxygen blowing and powder spraying elements of the converter extend in a direction parallel to the straight line direction, and an integral multiple of the straight line spacing of the furnace bottom bricks is formed between the oxygen blowing and powder spraying elements.

[0009] Preferably, the thickness of the fire clay is 0.5~5mm.

[0010] Preferably, after the furnace bottom is fully covered, it is left to stand for more than 3 days, and then the converter bottom is installed on the converter.

[0011] During the masonry process of magnesia carbon bricks, fire mud is applied around the magnesia carbon bricks in a certain thickness, and then the magnesia carbon bricks are squeezed tightly, that is, the magnesia carbon bricks are separated by fire mud and firmly bonded together.

[0012] The present invention provides a method for laying magnesia-carbon bricks for a converter active furnace bottom. The method improves the laying process and the laying structure, and on this basis, fire clay is used between the furnace bottom bricks for laying. The masonry obtained by the method has a higher structural strength and the construction efficiency is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a vertical cross-sectional view of a converter as an application environment of the present invention.

[0014] Figure 2 It is a top view of the masonry structure obtained by the present invention. DETAILED DESCRIPTION

[0015] The specific embodiments of the present invention will be described in detail below. In order to avoid too much unnecessary details, the well-known structures or functions will not be described in detail in the following examples. The approximate language used in the following examples can be used for quantitative expression, indicating that the quantity can be allowed to have a certain change without changing the basic function. Unless otherwise defined, the technical and scientific terms used in the following examples have the same meaning as those generally understood by those skilled in the art to which the present invention belongs.

[0016] Example 1 A method for laying magnesia-carbon bricks for the movable bottom of a converter adopts a straight line laying form and applies fire mud for construction. Specifically, the method first determines the direction of the straight line and the brick size. In order to reduce the brick type of the furnace bottom bricks and the trouble of sawing bricks during the laying process and improve the laying efficiency, each of the six gas supply bricks at the furnace bottom is laid in a straight line. Then, the width of the furnace bottom bricks is determined according to the diameter of the furnace bottom and the conventional production brick size of the furnace bottom bricks (the conventional brick width size is 150±10mm and the thickness size is 130±30mm), and then the thickness of the furnace bottom bricks is determined according to the spacing between the air supply holes of adjacent gas supply bricks. The brick size of the furnace bottom bricks between the six gas supply bricks arranged in a straight line cannot fit the spacing between the gas supply bricks. The brick type of the furnace bottom bricks in the two straight-line rows can be adjusted, and the brick width size range can be adjusted to be controlled between 100~150mm, so that the brick type of the furnace bottom bricks is designed as two fixed brick types. The comprehensive design concept of furnace bottom brick masonry forms the masonry layout shown in the figure, that is, two adjacent gas supply bricks are arranged in a straight line and laid adjacent to each other. On this basis, the brick size is determined, and the design calculation of the brick size must also leave room for the thickness of the fire mud.

[0017] Example 2 A method for laying magnesia-carbon bricks for a converter active bottom comprises: using an air supply hole on a bottom plane as the center position of an air supply brick, and using each air supply brick as a straight line point for laying bricks in a straight line ...

[0018] Example 3 A method for laying magnesia-carbon bricks for a converter active furnace bottom includes: using the air supply hole on the furnace bottom plane as the center position of the air supply brick, and using each air supply brick as a straight line point for laying furnace bottom bricks in a straight line, adding a straight line column of furnace bottom bricks between adjacent straight lines of air supply bricks in a straight line, so that a straight line column of furnace bottom bricks is separated by a straight line column of adjacent straight lines of air supply bricks, and each straight line column of straight lines of in-line bricks is parallel, consistent in direction, and close to each other, and then the furnace bottom is fully paved with furnace bottom bricks, and adjacent brick bodies are aligned in the direction of the straight line, and adjacent brick bodies are staggered in the direction perpendicular to the straight line; and there is fire mud between adjacent brick bodies. The brick type size of the furnace bottom bricks between the straight line masonry rows of 6 air supply bricks cannot fit the spacing between the air supply bricks, and the brick type of the furnace bottom bricks in the two straight line rows can be adjusted, and the brick width size range of the adjustment brick is controlled between 100 and 150 mm, so that the brick type of the furnace bottom bricks is designed as two fixed brick types. After the furnace bottom is fully paved, let it stand for 3 days in summer, and then install the converter bottom on the converter.

[0019] Example 4 A method for laying magnesia-carbon bricks on a live bottom of a converter comprises: using an air supply hole on a bottom plane as the center position of an air supply brick, and using each air supply brick as a straight line point for laying furnace bottom bricks in a straight line, adding two straight lines of laying furnace bottom bricks in a straight line between adjacent straight lines of laying furnace bottom bricks in a straight line, so that two straight lines of laying furnace bottom bricks in a straight line are formed between adjacent straight lines of laying furnace bottom bricks in a straight line, and each straight line of laying furnace bottom bricks is parallel, oriented in the same direction, and close to each other, and then the bottom of the furnace is fully paved with furnace bottom bricks, adjacent brick bodies are aligned in the direction of the straight line, and adjacent brick bodies are staggered in the direction perpendicular to the straight line; and fire mud is provided between adjacent brick bodies. The size of the furnace bottom bricks between the 6 gas supply bricks arranged in a straight line cannot fit the spacing between the gas supply bricks. The brick types of the two straight-line furnace bottom bricks can be adjusted to adjust the brick width range to between 100 and 150 mm, so that the furnace bottom bricks are designed to be fixed in two brick types. After the furnace bottom is fully paved, it is left to stand for 15 days in winter, and then the converter bottom is installed on the converter.

[0020] The embodiments of the present invention are described in detail above, but the contents are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the scope of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for laying magnesia-carbon bricks for a converter active bottom, characterized in that: include: Several air supply holes arranged on the plane of the furnace bottom serve as the positions of the air supply bricks, and at this position each individual air supply brick forms a straight line masonry row with the furnace bottom bricks. In the direction of the straight line, adjacent bricks are aligned, and in the direction perpendicular to the straight line, adjacent bricks are staggered; there is fire mud between adjacent bricks.

2. The method for laying magnesia-carbon bricks for the active bottom of a converter according to claim 1, characterized in that: Each air supply brick, that is, the oxygen blowing and powder spraying element, is individually formed into a straight line arrangement, and the masonry straight lines are parallel to each other.

3. The method for laying magnesia-carbon bricks for a converter active bottom according to claim 1, characterized in that: The width of furnace bottom bricks ranges from 150±10mm and the thickness ranges from 130±30mm.

4. The method for laying magnesia-carbon bricks for a converter active bottom according to claim 3, characterized in that: The same single row of adjustment furnace bottom bricks is arranged between each row of gas supply bricks, and the width of the adjustment bricks is controlled within the range of 100~150mm.

5. The method for laying magnesia-carbon bricks for a converter active bottom according to claim 1, characterized in that: The thickness of fire clay is 0.5~5mm.

6. The method for laying magnesia-carbon bricks for a converter active bottom according to claim 1, characterized in that: After the furnace bottom is fully covered, let it stand for more than 3 days, and then install the converter bottom on the converter.

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