A nozzle for a ladle used for adding water to molten steel

Abstract

The present invention provides a nozzle for a ladle for adding water to molten steel. The nozzle includes a body. One end of the body forms a fixed end, and the other end forms a liquid outlet end. The body includes a shell, a refractory layer, and a diversion layer. A first bottom plate is provided at the lower end of the refractory layer. Outer side plates are provided at both ends of the first bottom plate. The linear distance of the first bottom plate between the two outer side plates ranges from 1960 mm to 3600 mm. A second bottom plate is provided at the lower end of the diversion layer. The second bottom plate is arranged on the first bottom plate. Inner side plates are provided on both sides of the second bottom plate. The linear distance of the second bottom plate between the two inner side plates is 1420 mm to 3090 mm. The downward extension direction of the central axis of the ladle is the first direction, and the upward top surface of the second bottom plate along the extension direction from the fixed end to the liquid outlet end is the second direction. The included angle range between the first direction and the second direction is 105° to 110°. By redesigning the structures such as the width, length, and elevation angle of the existing nozzle for adding water to the ladle, the service life of the nozzle is increased from the original 70 - 80 ladles to 350 - 400 ladles.

Description

Technical Field

[0001] The present invention relates to the technical field of bar steel blocking, and particularly relates to a nozzle for a ladle for mixing molten steel with water. Background Art

[0002] A ladle for mixing molten steel with water is a container used in steelmaking for transferring and mixing molten steel, and the nozzle is an important component for pouring molten steel out of the ladle. In the prior art, due to unreasonable design of the elevation angle, length and width dimensions of the nozzle of the ladle for mixing molten steel with water, every time molten steel is poured into the AOD furnace, a part of the molten steel will always leak outside the furnace when pouring to the end, resulting in low metal yield. In addition, under the thermal expansion and contraction caused by the high temperature of molten steel (generally at 1200 - 1300 °C) and the erosion of the flow of molten steel, the nozzle of the ladle for mixing molten steel with water is easily damaged. Under such working conditions, the original nozzle of the ladle for mixing molten steel with water generally can be used for 70 - 80 ladles, and then the nozzle is completely melted and cannot be used anymore, and a new nozzle needs to be reinstalled. Summary of the Invention

[0003] The purpose of the present invention is to provide a nozzle for a ladle for mixing molten steel with water to overcome the above problems.

[0004] The present invention is achieved by the following technical solutions:

[0005] A nozzle for a ladle for mixing molten steel with water, wherein the improvement lies in that the nozzle includes a body, one end of the body forms a fixed end for connecting with the ladle, and the other end forms a liquid outlet end. The body includes a shell, a refractory layer and a flow guiding layer;

[0006] A first bottom plate is provided at the lower end of the refractory layer. Outer side plates are provided at both ends of the first bottom plate. The linear distance of the first bottom plate between the two outer side plates ranges from 1960 mm to 3600 mm;

[0007] A second bottom plate is provided at the lower end of the flow guiding layer. The second bottom plate is arranged on the first bottom plate. Inner side plates are provided on both sides of the second bottom plate. The linear distance of the second bottom plate between the two inner side plates is 1420 mm to 3090 mm;

[0008] The downward extension direction of the central axis of the ladle is the first direction,

[0009] The upward top surface of the second bottom plate along the extension direction from the fixed end to the liquid outlet end is the second direction. The included angle range between the first direction and the second direction is 105° - 110°.

[0010] Further, in the above nozzle for a ladle for mixing molten steel with water,

[0011] The length range of the shell along the extension direction from the fixed end to the liquid outlet end is 1115 mm to 1120 mm;

[0012] The length range of the refractory layer along the extension direction from the fixed end to the liquid outlet end is 1940 mm - 1950 mm;

[0013] The length range of the diversion layer along the extension direction from the fixed end to the liquid outlet end is 2290 mm - 2300 mm.

[0014] Furthermore, in the above-mentioned nozzle for ladle with molten steel and water addition,

[0015] The thickness of the shell is uniformly arranged along the extension direction from the fixed end to the liquid outlet end, and the shell is arranged in a downward concave arc shape along the width direction.

[0016] Furthermore, in the above-mentioned nozzle for ladle with molten steel and water addition,

[0017] The first bottom plate and the two outer side plates are combined into a first U shape with an upward opening. The thicknesses of the two outer side plates gradually become thinner along the extension direction from the fixed end to the liquid outlet end and gradually become thicker along the first direction; the thickness range of the first bottom plate along the extension direction from the fixed end to the liquid outlet end is 100 mm - 450 mm.

[0018] Furthermore, in the above-mentioned nozzle for ladle with molten steel and water addition,

[0019] The second bottom plate and the two inner side plates are combined into a second U shape with an upward opening. The two inner side plates gradually become thinner along the extension direction from the fixed end to the liquid outlet end and gradually become thicker along the first direction;

[0020] The thickness range of the second bottom plate along the extension direction from the fixed end to the liquid outlet end is 80 mm - 400 mm.

[0021] Furthermore, in the above-mentioned nozzle for ladle with molten steel and water addition,

[0022] The opening width of the first U shape gradually becomes narrower along the extension direction from the fixed end to the liquid outlet end, and the opening width range of the first U shape is 1960 mm - 3650 mm;

[0023] The opening width of the second U shape gradually becomes narrower along the extension direction from the fixed end to the liquid outlet end, and the opening width range of the second U shape is 1420 mm - 3140 mm.

[0024] Furthermore, in the above-mentioned nozzle for ladle with molten steel and water addition,

[0025] One end of the diversion layer connected to the ladle is provided with a first transition section, the first transition section is in an upward convex arc shape, and the arc radius range of the first transition section is 1700 mm - 1750 mm;

[0026] The diversion layer is provided with a second transition section near the liquid outlet end. The second transition section is in an upward convex arc shape, and the arc radius of the second transition section ranges from 700 mm to 750 mm.

[0027] Further, in the above-mentioned nozzle for ladle with molten steel and water addition,

[0028] The nozzle further includes a reinforcing member. The reinforcing member is arranged on the lower side of the housing, connects the lower end of the housing to the outer wall of the ladle, and provides support for the nozzle.

[0029] Further, in the above-mentioned nozzle for ladle with molten steel and water addition,

[0030] The nozzle is also provided with a nozzle belt. The nozzle belts are symmetrically arranged on both sides of the nozzle and are used to connect the housing on both sides of the nozzle to the outer wall of the ladle. The distance between the connection points of the two nozzle belts and the ladle is equal to the diameter of the ladle.

[0031] Further, in the above-mentioned nozzle for ladle with molten steel and water addition,

[0032] The housing is a steel plate;

[0033] The refractory layer is magnesia-carbon brick;

[0034] The diversion layer is corundum material.

[0035] Analysis shows that for a nozzle for ladle with molten steel and water addition disclosed by the present invention, by redesigning the width, length, elevation angle and other structures of the original nozzle for water addition, the service life of the nozzle is increased from the original 70 - 80 ladles to 350 - 400 ladles. At the same time, it ensures that the molten steel does not leak during the whole process of pouring molten steel.

[0036] In summary, the bar conveying roller path provided by the present invention has the following advantages:

[0037] ① Improve the service life of the nozzle device for ladle with water addition;

[0038] ② Improve the metal yield rate of molten steel;

[0039] ③ Reduce the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. Among them:

[0041] Figure 1 is the front sectional view of the nozzle for ladle with molten steel and water addition provided by the present invention;

[0042] Figure 2Side cross-sectional view of the nozzle for the ladle with molten steel mixed with water provided by the present invention.

[0043] Explanation of reference numerals:

[0044] 1, flow guiding layer; 2, refractory layer; 3, housing; 4, filling structure. Detailed implementation manners

[0045] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention rather than a limitation of the present invention. In fact, those skilled in the art will clearly understand that modifications and variations can be made to the present invention without departing from the scope or spirit of the present invention. For example, features shown or described as part of one embodiment can be used in another embodiment to yield yet another embodiment. Therefore, it is desirable that the present invention include such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0046] In the description of the present invention, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. The terms "connected", "connected to", and "provided with" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0047] To solve the above problems, through long-term exploration and research, the present invention has designed and developed a nozzle for the ladle with molten steel mixed with water, and re-adjusted the dimensions such as the width, length, and elevation angle of the nozzle. After actual use, during the entire process of pouring molten steel, there is no leakage of molten steel from the ladle with this nozzle, and the service life of the nozzle is extended to 350 - 400 ladles. Further, if the nozzle is simply repaired once during use, the service life of the nozzle can be extended to 500 ladles. Based on the above facts, the improved nozzle has solved the two major problems in the prior art, namely, molten steel leakage in the later stage of nozzle use and too low service life.

[0048] As Figure 1 shown, it is the front cross-sectional view of a nozzle for the ladle with molten steel mixed with water provided by the present invention; Figure 2 It is the side cross-sectional view of a nozzle for the ladle with molten steel mixed with water provided by the present invention. The nozzle includes a body, one end of the body forms a fixed end for connecting with the ladle (such as Figure 2 the left end shown in Figure 2the right end shown in [description], the body includes a shell 3, a refractory layer 2, and a diversion layer 1.

[0049] Specifically, a first bottom plate is provided at the lower end (bottom end) of the above-mentioned refractory layer 2. Outer plates are provided at both ends of the first bottom plate. The linear distance between the two outer plates along the first bottom plate ranges from 1960 mm to 3600 mm. The linear distance between the two outer plates along the first bottom plate is also the width of the first bottom plate, that is, the width range of the first bottom plate is from 1960 mm to 3600 mm. Since the molten steel in the ladle flows from the fixed end of the nozzle to the liquid outlet end, the width of the first bottom plate is the widest at the fixed end and the narrowest at the liquid outlet end.

[0050] Similarly, a second bottom plate is provided at the lower end of the diversion layer 1. The second bottom plate is provided on the first bottom plate, that is, the lower bottom surface of the second bottom plate is attached to the upper bottom surface of the first bottom plate. Inner plates are provided on both sides of the second bottom plate. The two inner plates are correspondingly attached to the inner walls of the two outer plates. The linear distance between the two inner plates along the second bottom plate is from 1420 mm to 3090 mm. The linear distance between the two inner plates along the second bottom plate is also the width of the second bottom plate, that is, the width range of the second bottom plate is from 1420 mm to 3090 mm. Since the molten steel in the ladle flows from the fixed end of the nozzle to the liquid outlet end, the width of the second bottom plate is the widest at the fixed end and the narrowest at the liquid outlet end.

[0051] The downward extension direction of the central axis of the ladle is the first direction, and the upper top surface of the second bottom plate (i.e., the upper top surface of the diversion layer 1) extends from the fixed end to the liquid outlet end is the second direction. The included angle range between the first direction and the second direction is 105° - 110°. Setting the upper top surface of the diversion layer 1 within the angle range of 105° - 110° is the optimal angle finally selected in combination with factors such as the shape of the ladle and the angle at which the ladle needs to be tilted when pouring molten steel. Setting the upper top surface of the diversion layer 1 of the nozzle: that is, the inclined surface where the molten steel finally flows out to this angle range of 105° - 110° can enable the ladle to pour out all the molten steel in the ladle within the optimal tilting angle range, and during the pouring process, the flow rate of the molten steel is stable and at this flow rate, the self-gravity of the molten steel is greater than the "adhesion force" between the molten steel and the shell 3 of the nozzle. Therefore, there will be no leakage of the molten steel flowing along the outer wall of the shell 3 at the liquid outlet end after the molten steel flows through the nozzle. No leakage occurs during the pouring process of the molten steel. On the one hand, it can reduce the corrosion of the molten steel on the shell 3 of the nozzle, and on the other hand, it can reduce the loss of the molten steel.

[0052] Furthermore, the length of the above-mentioned housing 3 in the extending direction from the fixed end to the liquid outlet end of the nozzle is in the range of 1115 mm - 1120 mm. The length of the refractory layer 2 in the extending direction from the fixed end to the liquid outlet end is in the range of 1940 mm - 1950 mm. The length of the flow guiding layer 1 in the extending direction from the fixed end to the liquid outlet end is in the range of 2290 mm - 2300 mm. With such a setting, it is possible to further ensure that the speed of the molten steel when flowing out from the liquid outlet end is within the optimal range.

[0053] Preferably, the housing 3 is provided with a uniform thickness in the extending direction from the fixed end to the liquid outlet end, and the housing 3 is arranged in an arc shape that is concave downward in the width direction. By setting the thickness of the housing 3 in this way, a gap can be provided between the housing 3 and the outer wall of the refractory layer 2, and this gap can be used for the nozzle to dissipate heat. At the same time, to increase the stability of the nozzle, a filling structure 4 can be arranged in this gap for strengthening the nozzle. Preferably, a filling structure 4 with a cooling function can be selected to fill the gap, so that it can not only stabilize the nozzle but also better cool the nozzle, further improving the service life of the nozzle.

[0054] Furthermore, as Figure 1 shown, the combination of the first bottom plate and the two outer side plates forms a first U-shaped with an upward opening. The thicknesses of the two outer side plates gradually become thinner in the extending direction from the fixed end to the liquid outlet end (i.e., gradually become thinner from the left end to the right end in Figure 2 ), and gradually become thicker in the first direction (i.e., gradually become thicker from the upper end to the lower end in Figure 2 ).

[0055] Preferably, the thickness of the first bottom plate in the extending direction from the fixed end to the liquid outlet end is in the range of 100 mm - 450 mm. Since the molten steel flows from the fixed end to the liquid outlet end, the amount of molten steel at the fixed end is large and the relative temperature is higher. Therefore, setting the thickness of the first bottom plate to gradually become thicker in the extending direction from the fixed end to the liquid outlet end is also to improve the service life of the nozzle.

[0056] Furthermore, as Figure 1 shown, the combination of the second bottom plate and the two inner side plates forms a second U-shaped with an upward opening. The two inner side plates gradually become thinner in the extending direction from the fixed end to the liquid outlet end (i.e., gradually become thinner from the left end to the right end in Figure 2 ), and gradually become thicker in the first direction (i.e., gradually become thicker from the upper end to the lower end in Figure 2 ).

[0057] Preferably, the thickness of the second bottom plate in the extending direction from the fixed end to the liquid outlet end is in the range of 80 mm - 400 mm. Since the molten steel flows from the fixed end to the liquid outlet end, the amount of molten steel at the fixed end is large and the relative temperature is higher. Therefore, setting the thickness of the second bottom plate to gradually become thicker in the extending direction from the fixed end to the liquid outlet end is also to improve the service life of the nozzle.

[0058] Preferably, the opening width of the first U-shaped gradually narrows along the extension direction from the fixed end to the liquid outlet end, and the opening width range of the first U-shaped is 1960 mm - 3650 mm. Since the molten steel flows from the fixed end to the liquid outlet end, the amount of molten steel at the fixed end is large. To ensure the flow rate of the molten steel from the liquid outlet end, the opening width of the first U-shaped at the liquid outlet end is set to be smaller, which can further increase the flow rate of the molten steel and avoid the leakage of the molten steel "flowing down along" the outer wall of the housing 3 at the liquid outlet end due to the "adhesion force".

[0059] Preferably, the opening width of the second U-shaped gradually narrows along the extension direction from the fixed end to the liquid outlet end, and the opening width range of the second U-shaped is 1420 mm - 3140 mm. Since the molten steel flows from the fixed end to the liquid outlet end, the amount of molten steel at the fixed end is large. To ensure the flow rate of the molten steel from the liquid outlet end, the opening width of the second U-shaped at the liquid outlet end is set to be smaller, which can further increase the flow rate of the molten steel and avoid the leakage of the molten steel "flowing down along" the outer wall of the housing 3 at the liquid outlet end due to the "adhesion force".

[0060] Furthermore, one end of the diversion layer 1 connected to the ladle is provided with a first transition section, the first transition section is in an upward convex arc shape, and the arc radius range of the first transition section is 1700 mm - 1750 mm. Setting the first transition section as an arc shape can reduce the impact corrosion of the molten steel on the connection part between the diversion layer 1 and the ladle when pouring the molten steel, thereby improving the service life of the nozzle.

[0061] Furthermore, the diversion layer 1 near the liquid outlet end is provided with a second transition section, the second transition section is in an upward convex arc shape, and the arc radius range of the second transition section is 700 mm - 750 mm. Setting the second transition section as an arc shape can reduce the impact corrosion of the molten steel on the diversion layer 1 at the liquid outlet end when pouring the molten steel, thereby improving the service life of the nozzle.

[0062] To further improve the strength of the nozzle, the nozzle further includes a reinforcing member, the reinforcing member is arranged on the lower side of the housing 3, connects the lower end of the housing 3 to the outer wall of the ladle, and provides support for the nozzle.

[0063] Furthermore, to improve the strength of the nozzle, the nozzle is also provided with a nozzle band, the nozzle band is symmetrically arranged on both sides of the nozzle, is used to connect the housing 3 on both sides of the nozzle to the outer wall of the ladle, and the distance between the connection points of the two nozzle bands and the ladle is equal to the diameter of the ladle.

[0064] Preferably, the above-mentioned housing 3 is a steel plate, specifically a Q235 steel plate; the refractory layer 2 is a magnesia-carbon brick; the diversion layer 1 is formed by casting corundum material.

[0065] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A nozzle for a ladle used for adding water to molten steel, characterized in that, The nozzle includes a body. One end of the body forms a fixed end for connecting with the ladle, and the other end forms a liquid outlet end. The body includes a housing, a refractory layer, and a diversion layer; A first bottom plate is provided at the lower end of the refractory layer. Outer side plates are provided at both ends of the first bottom plate. The linear distance of the first bottom plate between the two outer side plates ranges from 1960 mm to 3600 mm; A second bottom plate is provided at the lower end of the diversion layer. The second bottom plate is arranged on the first bottom plate. Inner side plates are provided on both sides of the second bottom plate. The linear distance of the second bottom plate between the two inner side plates is 1420 mm to 3090 mm; The downward extension direction of the central axis of the ladle is the first direction, The upward top surface of the second bottom plate along the extension direction from the fixed end to the liquid outlet end is the second direction. The included angle range between the first direction and the second direction is 105° - 110°; The length of the housing along the extension direction from the fixed end to the liquid outlet end ranges from 1115 mm to 1120 mm; The nozzle further includes a reinforcing member. The reinforcing member is arranged on the lower side of the housing, connects the lower end of the housing with the outer wall of the ladle, and provides support for the nozzle.

2. The nozzle for a molten steel and water mixing ladle according to claim 1, wherein, The length of the refractory layer along the extension direction from the fixed end to the liquid outlet end ranges from 1940 mm to 1950 mm; The length of the diversion layer along the extension direction from the fixed end to the liquid outlet end ranges from 2290 mm to 2300 mm.

3. The nozzle for a molten steel and water mixing ladle according to claim 2, wherein, The thickness of the housing is uniformly arranged along the extension direction from the fixed end to the liquid outlet end, and the housing is arranged in an arc shape that is concave downward along the width direction.

4. The nozzle for a molten steel and water mixing ladle according to claim 2, wherein, The first bottom plate and the two outer side plates are combined into a first U shape with an upward opening. The thicknesses of the two outer side plates gradually become thinner along the extension direction from the fixed end to the liquid outlet end, and gradually become thicker along the first direction; The thickness of the first bottom plate along the extension direction from the fixed end to the liquid outlet end ranges from 100 mm to 450 mm.

5. The nozzle for a molten steel and water mixing ladle according to claim 4, wherein, The second bottom plate and the two inner side plates are combined into a second U shape with an upward opening. The two inner side plates gradually become thinner along the extension direction from the fixed end to the liquid outlet end, and gradually become thicker along the first direction; The thickness of the second bottom plate along the extension direction from the fixed end to the liquid outlet end ranges from 80 mm to 400 mm.

6. The nozzle for a molten steel and water mixing ladle according to claim 5, wherein, The opening width of the first U shape gradually becomes narrower along the extension direction from the fixed end to the liquid outlet end, and the opening width range of the first U shape is 1960 mm to 3650 mm; The opening width of the second U shape gradually becomes narrower along the extension direction from the fixed end to the liquid outlet end, and the opening width range of the second U shape is 1420 mm to 3140 mm.

7. The nozzle for a molten steel and water mixing ladle according to claim 5, wherein, One end of the diversion layer connected to the ladle is provided with a first transition section, the first transition section is in an upward convex arc shape, and the arc radius of the first transition section ranges from 1700 mm to 1750 mm; The diversion layer is provided with a second transition section near the liquid outlet end, the second transition section is in an upward convex arc shape, and the arc radius of the second transition section ranges from 700 mm to 750 mm.

8. The nozzle for ladle with molten steel and water according to claim 1, wherein The nozzle is further provided with a nozzle strap, the nozzle straps are symmetrically arranged on both sides of the nozzle and are used to connect the shells on both sides of the nozzle and the outer wall of the ladle, and the distance between the connection points of the two nozzle straps and the ladle is equal to the diameter of the ladle.

9. The nozzle for ladle with molten steel and water according to claim 1, wherein The shell is made of steel plate; The refractory layer is magnesia-carbon brick; The diversion layer is made of corundum material.

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