Refractory lining of blast furnace tapping channel

Abstract

The refractory lining of the blast furnace tapping channel comprises a refractory lining body and a connecting part, the refractory lining body comprises a contact layer, an early warning layer, a heat preservation layer and a strength layer, the refractory lining body is in an arc shape, the contact layer is the uppermost layer and directly makes contact with molten iron, the early warning layer is arranged below the contact layer, and the strength layer is arranged below the early warning layer. The early warning layer is arranged below the fire-resistant lining body, the heat preservation layer is arranged below the early warning layer, the strength layer is arranged below the heat preservation layer and is the outermost layer of the fire-resistant lining body, the strength layer is directly in contact with the wall of the molten iron trough, made of carbon fibers and of a double-wave-crest winding structure, and double wave crests of the strength layer are in a high-low staggered wave crest design. The fireproof lining body comprises two wave crests, a pipeline is arranged in the two wave crests, a cross-shaped bearing strip is arranged in the pipeline, the connecting part comprises a connecting protrusion and a connecting groove, the connecting protrusion and the connecting groove are fixedly connected to the front face and the rear face of the fireproof lining body respectively, and the connecting groove and the connecting protrusion are matched to be used for connecting the two fireproof linings.

Description

Technical Field

[0001] This utility model relates to the field of refractory lining technology for blast furnaces, and in particular to a refractory lining for a blast furnace tapping trough. Background Technology

[0002] In blast furnace steelmaking, the blast furnace tapping trough is often used to connect the blast furnace and the molten iron ladle to facilitate the flow of molten iron. Because it needs to be subjected to high temperature, molten iron scouring and chemical corrosion for a long time, the refractory materials are required to have strong high temperature resistance, wear resistance and slag resistance, as well as sufficient mechanical strength and stability.

[0003] When using a blast furnace tapping trough, a prefabricated refractory lining is often installed inside the trough to protect it. Since the refractory lining is in direct contact with the high-temperature molten iron, it is not enough to only consider the high-temperature resistance and corrosion resistance of the refractory lining. Therefore, it is necessary to improve the refractory lining in many ways. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a refractory lining for the tapping trough of a blast furnace.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: A refractory lining for a blast furnace tapping trough includes a refractory lining body and a connecting part. The refractory lining body includes a contact layer, a warning layer, a heat insulation layer, and a strength layer. The refractory lining body is arc-shaped. The contact layer, the uppermost layer directly in contact with molten iron, is made of high-alumina bauxite clinker. This material is resistant to high temperatures and corrosion and does not stick to slag, facilitating direct contact between the refractory lining body and the high-temperature molten iron. Below the contact layer is the warning layer, which is made of carbonaceous refractory material. When the contact layer is damaged, causing the warning layer to directly contact the molten iron, the color of the carbonaceous refractory material will change from dark gray to other colors and will oxidize, expanding the pores and making the structure more fragile. This indicates that this area can no longer be used and needs to be replaced. The heat insulation layer is located above the warning layer. The lower part is composed of refractory insulating rock wool. The strength layer is located below the insulation layer and is the outermost layer of the refractory lining body. The strength layer is in direct contact with the wall of the iron outlet groove and is made of carbon fiber with a double-peak winding structure. This structure enables the refractory lining body to have high compressive and impact resistance, while effectively dispersing the pressure and reducing the risk of deformation and cracking. The connecting part includes a connecting protrusion and a connecting groove. The connecting protrusion and the connecting groove are respectively fixedly connected to the front and rear surfaces of the refractory lining body and are both arc-shaped with the same shape as the refractory lining body. The length of the connecting groove and the connecting protrusion are the same as the circumference of the arc of the refractory lining body. The connecting groove and the connecting protrusion match each other so that two refractory lining bodies can be spliced ​​together.

[0006] Preferably, the insulation layer is the thickest layer of the refractory lining body. A thicker insulation layer has a better insulation effect and reduces the heat loss of the flowing molten iron. The warning layer is the thinnest layer, thus reducing the overall thickness of the refractory lining body.

[0007] Preferably, the contact portion of the connecting protrusion and the connecting groove is filled with foamed silicone to stabilize the connection, improve airtightness, and reduce the impact of thermal expansion and contraction on the connection.

[0008] Preferably, the connecting part is made of the same high-alumina bauxite clinker as the contact layer, which can effectively prevent molten iron from corroding the joint.

[0009] Preferably, the double peaks of the strength layer are filled with high-temperature resistant rock wool, making the strength layer a regular rectangle. This improves the stability of the strength layer and avoids various damages caused by the high and low peaks directly contacting the iron outlet groove. The double peaks are equipped with pipes and cross-shaped support strips. This design can effectively disperse the pressure on the strength layer, thereby further enhancing the strength layer's resistance to pressure and impact.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: the corrosion-resistant and high-temperature resistant contact layer is used to cope with the harsh environment brought by molten iron; the warning layer, which becomes fragile and changes color after contact with molten iron, can remind construction personnel that the refractory lining cannot be used and needs to be replaced; the connection of the connecting part allows only the damaged section to be replaced instead of the entire section; the thicker insulation layer reduces the heat loss of molten iron; and the strength layer with double-peak winding structure enhances the compressive and impact resistance of the refractory lining. Attached Figure Description

[0011] Figure 1 This is a top view of the refractory lining of the blast furnace tapping trough according to this utility model;

[0012] Figure 2 The refractory lining body of the blast furnace tapping trough of this utility model is arranged in sequence along... Figure 1 A cross-sectional structural diagram showing the direction indicated;

[0013] Figure 3 The refractory lining body of the blast furnace tapping trough of this utility model is arranged in sequence along... Figure 1 A longitudinal cross-sectional structural diagram in the indicated direction;

[0014] Figure 4 This is a schematic diagram of the winding of the strength layer of the refractory lining of the blast furnace tapping trough according to this utility model;

[0015] Figure 5 This is a schematic diagram showing the connection of the refractory lining of the blast furnace tapping trough according to this utility model. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Figure 1 and Figure 5 As shown, a refractory lining for a blast furnace tapping trough includes a refractory lining body 1 and a connecting part 2. The refractory lining body 1 is arc-shaped and fits tightly against the wall of the blast furnace tapping trough. The connecting part 2 includes a connecting protrusion 210 and a connecting groove 220. The connecting protrusion 210 and the connecting groove 220 are respectively fixedly connected to the front and rear surfaces of the refractory lining body 1 and are both arc-shaped like the refractory lining body 1. The lengths of the connecting groove 220 and the connecting protrusion 210 are the same as the circumference of the arc of the refractory lining body. The connecting groove 220 and the connecting protrusion 210 are matched so that two refractory lining bodies can be spliced ​​together.

[0017] like Figure 2 , Figure 3 and Figure 4 As shown, the refractory lining body 1 includes a contact layer 110, a warning layer 120, a thermal insulation layer 130, and a strength layer 140. The contact layer 110, the uppermost layer, is directly in contact with molten iron and is made of high-alumina bauxite clinker. This material is resistant to high temperatures and corrosion and does not stick to slag, facilitating direct contact between the refractory lining body 1 and the high-temperature molten iron. Below the contact layer 110 is the warning layer 120, which is made of carbonaceous refractory material to remind construction personnel that this area can no longer be used and needs to be replaced. The thermal insulation layer 130, located below the warning layer 120, is composed of refractory insulating rock wool. The strength layer 140 is located below the thermal insulation layer 120. Below layer 130 is the outermost layer of the refractory lining body 1. The strength layer 140, which is in direct contact with the wall of the iron outlet groove, is made of carbon fiber and adopts a double-peak winding structure. This structure enables the refractory lining body to have high compressive and impact resistance, while effectively dispersing the pressure and reducing the risk of deformation and cracking. The strength layer 140 is filled with high-temperature resistant rock wool below the double peaks 141, making the strength layer 140 a regular rectangle. The double peaks 141 are provided with pipes 142 and cross-shaped support strips 143 inside the pipes. This design can further enhance the compressive and impact resistance of the strength layer 140.

[0018] In use, the refractory linings are arranged along the direction of the trough according to its length. The connecting protrusion 210 at the front end and the connecting groove 220 at the rear end of each refractory lining piece correspond to the connecting groove 220 at the front and the connecting protrusion 210 at the rear, respectively, and then spliced ​​together. Foamed silicone is filled at the contact part between the connecting protrusion 210 and the connecting groove 220 to stabilize the connection, improve airtightness, and reduce the impact of thermal expansion and contraction on the connection part 2. After all the refractory linings are spliced ​​together, molten iron can be circulated. When the contact layer 110 is damaged due to long-term contact with molten iron, causing the warning layer 120 to come into direct contact with molten iron, the color of the warning layer 120 made of carbonaceous refractory material will change from dark gray to other colors and will oxidize, causing the pores to expand and the structure to become fragile, thus reminding the construction personnel that it is necessary to... The refractory lining has been replaced. The insulation layer 130, which is evenly laid inside the refractory lining body 1, can effectively reduce the heat loss of molten iron. The strength layer 140, located below the insulation layer 130, effectively disperses the pressure and impact force on the pressure-resistant lining body 1 through a double-peak winding structure, in conjunction with the pipe 142 and cross-shaped support strip 143 within the peaks, thereby improving the pressure resistance and impact resistance of the pressure-resistant lining. The strength layer 140 is filled with high-temperature resistant rock wool below the double peaks 141, making the strength layer 140 a regular rectangle, which improves the stability of the strength layer 140 and avoids various damages caused by the high and low peaks directly contacting the tapping groove. The design of the upper and lower positions of the insulation layer 130 and the strength layer 140 can reduce the interference of the strength layer 140 on the insulation effect of the insulation layer 130.

[0019] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A refractory lining for a blast furnace tapping trough, comprising a refractory lining body and a connecting portion, characterized in that: The refractory lining body includes a contact layer, an early warning layer, an insulation layer, and a strength layer. The refractory lining body is arc-shaped. The contact layer, which is the uppermost layer and directly contacts the molten iron, is made of high-alumina bauxite clinker. Below the contact layer is the early warning layer, which is made of carbonaceous refractory material. The insulation layer, located below the early warning layer, is composed of refractory insulating rock wool. The strength layer, located below the insulation layer, is the outermost layer of the refractory lining body. The strength layer, which directly contacts the wall of the molten iron trench, is made of carbon fiber and adopts a double-peak winding structure. The double peaks of the strength layer are designed with alternating high and low peaks. High-temperature resistant rock wool is filled below the double peaks. Pipes are installed inside the double peaks, and cross-shaped support strips are installed inside the pipes.

2. The refractory lining of the blast furnace tapping trough as described in claim 1, characterized in that: The connecting part includes a connecting protrusion and a connecting groove. The connecting protrusion and the connecting groove are respectively fixedly connected to the front and rear surfaces of the refractory lining body and are both arc-shaped like the refractory lining body. The length of the connecting groove and the connecting protrusion are the same as the arc circumference of the refractory lining body. The connecting groove and the connecting protrusion are matched.

3. The refractory lining of the blast furnace tapping trough as described in claim 1, characterized in that: The insulation layer is the thickest layer of the refractory lining body, and the warning layer is the thinnest layer.

4. The refractory lining of the blast furnace tapping trough as described in claim 2, characterized in that: The contact portion between the connecting protrusion and the connecting groove is filled with foamed silicone.

5. The refractory lining of the blast furnace tapping trough as described in claim 1, characterized in that: The connecting part is made of the same high-alumina bauxite clinker as the contact layer.

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