Converter bottom with reduced erosion rate of the bottom-blown gas brick

Abstract

The utility model discloses a converter bottom that slows down the erosion speed of bottom blowing gas permeable brick relates to flaw detection technical field, including converter shell, the bottom of converter shell is from below and above in proper order and is built with the permanent layer of bottom, the working layer of bottom, the permanent layer of bottom is level and builds the magnesium -aluminum brick, the working layer of bottom is vertical and builds the magnesia carbon brick, and vertical and build the magnesia carbon brick from the center of bottom to the periphery is in proper order and presents the circular ring shape arrangement, is evenly distributed with six bottom blowing gas permeable bricks in the position of vertical and build the eighth ring of magnesia carbon brick, and every bottom blowing gas permeable brick builds in the permanent layer of bottom and the working layer of bottom, wherein two bottom blowing gas permeable bricks are located in the tapping side of converter, the top surface of working layer of bottom of the two bottom blowing gas permeable bricks of the tapping side is equipped with a ring -shaped protective layer, and the ring -shaped protective layer is higher than the top surface of corresponding bottom blowing gas permeable brick. The utility model solves the technical problem that the bottom blowing effect keeps difficultly long of the bottom blowing gas permeable brick erosion too fast under the condition of today.

Description

Technical Field

[0001] This utility model relates to the field of converter steelmaking technology, and in particular to a converter hearth that slows down the erosion rate of bottom-blown permeable bricks. Background Technology

[0002] Top-and-bottom blowing converters are currently the mainstream trend in large converters. The erosion rate of the bottom-blown permeable bricks directly affects the stability of the bottom-blowing effect. Bottom-blown permeable bricks are crucial for the smelting of high-quality steels. Throughout the furnace's service life, with increasing furnace age, the erosion of the bottom-blown permeable bricks gradually intensifies due to high-temperature melting and chemical corrosion. In the later stages of furnace service, it is often necessary to reduce the bottom-blown gas flow rate or even shut down the permeable bricks to ensure safe and stable furnace operation. This compromises the bottom-blowing effect and negatively impacts the reduction of carbon-oxygen product and the improvement of steel cleanliness.

[0003] Chinese Patent CN110819757A discloses a maintenance method and device for bottom-blown permeable bricks in a converter. This device mainly uses a patching compound to repair eroded areas of the bottom-blown permeable bricks, ensuring the thickness of the bricks and extending their service life. Its main disadvantages are: (1) using a patching compound to repair eroded areas significantly increases maintenance costs; (2) manual loading of the patching compound is required, and the patching process takes time, affecting the converter's operational efficiency.

[0004] Therefore, this application needs to provide a solution that does not increase maintenance costs, does not affect converter production efficiency, and can slow down the erosion rate of bottom-blown permeable bricks while ensuring the bottom-blowing effect. Utility Model Content

[0005] This invention provides a converter hearth that slows down the erosion rate of bottom-blown permeable bricks, solving the technical problem of excessively rapid erosion of bottom-blown permeable bricks and difficulty in maintaining the bottom-blowing effect under current conditions without increasing maintenance costs or affecting converter production efficiency.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A converter bottom for slowing down the erosion rate of bottom-blown permeable bricks includes a converter shell. The bottom of the converter shell is constructed from bottom to top with a permanent bottom layer and a working bottom layer. The permanent bottom layer is horizontally laid with magnesia-alumina bricks. The working bottom layer is vertically laid with magnesia-carbon bricks, arranged in a circular pattern from the center to the periphery of the bottom. Six bottom-blown permeable bricks are distributed at the eighth ring of the vertically laid magnesia-carbon bricks, each brick being constructed within the permanent bottom layer and the working bottom layer. Two of these bottom-blown permeable bricks are located on the tapping side of the converter. An annular protective layer is provided on the top surface of the working bottom layer around the two bottom-blown permeable bricks on the tapping side, and this annular protective layer is higher than the top surface of the corresponding bottom-blown permeable brick.

[0008] Furthermore, the annular protective layer is 50-60mm above the top surface of the bottom-blown permeable brick.

[0009] Furthermore, an aluminum-magnesium brick is laid between the bottom of the vertically laid magnesia-carbon bricks on the two bottom-blown permeable bricks on the tapping side and the permanent layer of the furnace bottom, so that the vertically laid magnesia-carbon bricks on the periphery of the bottom-blown permeable bricks protrude from the furnace bottom working layer and the bottom-blown permeable bricks in other positions, forming the annular protective layer.

[0010] The beneficial effects of this utility model are:

[0011] The improved converter bottom structure of this utility model is completed directly during the converter lining process, and no special maintenance is required during the converter's operation, which is conducive to improving the converter's operating rate. The annular protective layer formed after lining slows down the erosion rate of the converter's permeable bricks, ensuring a good bottom blowing effect, which is conducive to reducing the carbon-oxygen product in converter smelting and improving the cleanliness of molten steel. At the same time, it reduces the maintenance cost of converter bottom blowing, eliminating the need to use spraying material to repair the bottom blowing permeable bricks. Attached Figure Description

[0012] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0013] Figure 1 This is a cross-sectional view of the overall structure of the converter of this utility model;

[0014] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0015] Figure 3 This is a top-view cross-sectional view of the overall structure of the converter of this utility model;

[0016] Attached image labels:

[0017] 1—Converter shell, 2—Permanent layer at the bottom of the furnace, 3—Working layer at the bottom of the furnace, 4—Bottom-blown permeable brick, 5—Annular protective layer, 6—Alumina-magnesia brick. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a central component. When a component is described as "connected to" another component, it can be directly connected to the other component or may have a central component. When a component is described as "set on" another component, it can be directly set on the other component or may have a central component. When a component is described as "set in the middle," it is not simply set in the exact center, as long as it is not set within the area defined by both ends being in the middle. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Reference Figures 1 to 3 As shown, a converter bottom for slowing down the erosion rate of bottom-blown permeable bricks includes a converter shell 1. The bottom of the converter shell 1 is constructed from bottom to top with a permanent bottom layer 2 and a working bottom layer 3. The permanent bottom layer 2 is horizontally laid with magnesia-alumina bricks. The working bottom layer 3 is vertically laid with magnesia-carbon bricks, which are arranged in a circular pattern from the center to the periphery of the bottom. Six bottom-blown permeable bricks 4 are distributed at the eighth ring of the vertically laid magnesia-carbon bricks. Each bottom-blown permeable brick 4 is built within the permanent bottom layer 2 and the working bottom layer 3. Two of the bottom-blown permeable bricks 4 are located on the tapping side 11 of the converter 1. An annular protective layer 5 is provided on the top surface of the working bottom layer 3 around the two bottom-blown permeable bricks 4 located on the tapping side 11. The annular protective layer 5 is higher than the top surface of the corresponding bottom-blown permeable brick 4.

[0022] The specific method is that during the construction of the bottom blown permeable bricks 4 in the converter, an additional layer of aluminum-magnesium bricks 6 is built between the bottom of the vertically laid magnesia-carbon bricks on the two bottom blown permeable bricks on the tapping side 11 and the permanent layer 2 of the furnace bottom. This makes the vertically laid magnesia-carbon bricks on the periphery of the bottom blown permeable bricks 4 protrude from the furnace bottom working layer 3 and the corresponding bottom blown permeable bricks 4 in other positions, so as to protect the bottom blown permeable bricks 4. The final annular protective layer 5 is 50-60mm higher than the top surface of the corresponding bottom blown permeable brick 4 and other vertically laid magnesia-carbon bricks.

[0023] The improved converter bottom structure of this utility model is completed directly during the converter lining process, and no special maintenance is required during the converter's operation, which is conducive to improving the converter's operating rate. The annular protective layer formed after lining slows down the erosion rate of the converter's permeable bricks, ensuring a good bottom blowing effect, which is conducive to reducing the carbon-oxygen product in converter smelting and improving the cleanliness of molten steel. At the same time, it reduces the maintenance cost of converter bottom blowing, eliminating the need to use spraying material to repair the bottom blowing permeable bricks.

[0024] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of the technical solution of this utility model.

Claims

1. A converter furnace bottom for slowing down the erosion rate of bottom-blown permeable bricks, comprising a converter shell, wherein the bottom of the converter shell is constructed from bottom to top with a permanent furnace bottom layer and a working furnace bottom layer; characterized in that, The permanent layer of the furnace bottom is lined with magnesia-alumina bricks; the working layer of the furnace bottom is lined with magnesia-carbon bricks, which are arranged in a circular pattern from the center to the periphery of the furnace bottom; six bottom-blown permeable bricks are distributed at the eighth ring of the vertical magnesia-carbon bricks, and each bottom-blown permeable brick is built in the permanent layer of the furnace bottom and the working layer of the furnace bottom; two of the bottom-blown permeable bricks are located on the tapping side of the converter; a ring-shaped protective layer is provided on the top surface of the working layer of the furnace bottom around the two bottom-blown permeable bricks on the tapping side, and the ring-shaped protective layer is higher than the top surface of the corresponding bottom-blown permeable brick.

2. The converter hearth for slowing down the erosion rate of bottom-blown permeable bricks according to claim 1, characterized in that, The annular protective layer is 50-60mm above the top surface of the bottom-blown permeable brick.

3. A converter hearth for slowing down the erosion rate of bottom-blown permeable bricks according to claim 2, characterized in that, An aluminum-magnesia brick is laid between the bottom of the vertically laid magnesia-carbon bricks on the two bottom-blown permeable bricks on the tapping side and the permanent layer of the furnace bottom, so that the vertically laid magnesia-carbon bricks on the periphery of the bottom-blown permeable bricks protrude to form the annular protective layer.

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