Method for improving self-opening rate of ladle nozzle and ladle baking structure

Abstract

The embodiment of the invention provides a method for improving the self-opening rate of a ladle nozzle and a ladle baking structure, and relates to the field of steelmaking production. The method for improving the self-opening rate of the ladle nozzle comprises the steps that a nozzle material is controlled to be installed at the nozzle of the ladle; the steel ladle is controlled to turn over, so that the water gap faces upwards; and hot air in the steel ladle is controlled to bake the nozzle material. In the working process, after the nozzle material is installed, the steel ladle is turned over to enable the nozzle to face the upper side, hot air in the steel ladle moves towards the upper side, the nozzle material can be baked while the hot air is exhausted, moisture and tar in the nozzle material can be baked out, mixing of the moisture and the tar with stuffing sand is reduced, and the service life of the nozzle material is prolonged. The particles react to generate a liquid phase, a sintering layer is formed at the high temperature of molten steel, and the self-opening rate of the nozzle of the steel ladle is improved by preventing the stuffing sand at the nozzle material from being sintered.

Description

Technical Field

[0001] The invention relates to the field of steelmaking production, and in particular to a method for improving the self-opening rate of a ladle water nozzle and a ladle baking structure. Background Art

[0002] In the steelmaking process, the self-opening rate of the ladle water inlet plays a key role in affecting the quality of molten steel and the production rhythm. The existing method to improve the self-opening rate is usually to use high-grade drainage sand, that is, drainage sand containing high chromium or zirconium, to reduce the phenomenon of drainage sand sintering. However, when using ordinary drainage sand for the first time when facing the new water inlet, the effect of improving the self-opening rate is limited. Therefore, from the perspective of reducing costs and increasing efficiency, it is necessary to reduce the use of expensive high-grade drainage sand and use technology to solve the problem of ordinary drainage sand being sintered when the new water inlet is used for the first time. Summary of the invention

[0003] The invention provides a method for improving the self-opening rate of a ladle nozzle and a ladle baking structure, which can fully utilize the hot air in the ladle to bake the nozzle material, thereby improving the self-opening rate of the ladle nozzle.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] An embodiment of the present invention provides a method for improving the self-opening rate of a ladle nozzle, which comprises:

[0006] The control nozzle material is installed on the nozzle of the ladle;

[0007] Controlling the ladle to flip so that the water inlet faces upward;

[0008] The hot air in the ladle is controlled to bake the nozzle material.

[0009] Optionally, the step of controlling the ladle to flip comprises:

[0010] Controlling the ladle to flip until the water inlet and the support surface are at 90 degrees;

[0011] The ladle is controlled to flip 10° to 20° toward a side away from the water nozzle, so that the water nozzle and the supporting surface are relatively inclined.

[0012] Optionally, the step of installing the control nozzle material on the nozzle of the ladle includes:

[0013] Controlling the slide plate to open to open the water inlet;

[0014] The nozzle material is installed on the nozzle.

[0015] Optionally, after the step of installing the nozzle material on the nozzle, the step of controlling the nozzle material to be installed on the nozzle of the ladle further includes:

[0016] sealing the ladle opening of the ladle;

[0017] Controlling the slide plate to close first to seal the water outlet;

[0018] The slide plate is controlled to open again to open the water outlet.

[0019] Optionally, in the step of controlling the slide plate to close first to seal the water outlet,

[0020] The closing time of the slide plate is t, wherein 1min≤t≤2min.

[0021] Optionally, at the same time as or after the step of controlling the slide plate to open again to open the nozzle, the step of controlling the nozzle material to be installed on the nozzle of the ladle further includes:

[0022] The ladle opening is opened.

[0023] Optionally, the step of controlling the hot air in the ladle to bake the nozzle material comprises:

[0024] Obtaining the real-time temperature of the ladle;

[0025] Determining the baking time according to the real-time temperature;

[0026] The nozzle material is baked according to the baking time.

[0027] Optionally, in the step of determining the baking time according to the real-time temperature,

[0028] The baking time is calculated according to the formula: T=E / (AE), where T is the number of minutes of baking, E is the preset reference value, and A is the real-time temperature.

[0029] Optionally, after the step of baking the nozzle material according to the baking time, the step of controlling the hot air in the ladle to bake the nozzle material further includes:

[0030] Visually observe whether flames or water vapor come out of the water outlet. If not, stop baking; if so, continue baking until no flames or water vapor comes out.

[0031] An embodiment of the present invention further provides a ladle baking structure, comprising a ladle and a nozzle material; wherein the nozzle material is installed at the nozzle of the ladle, and the nozzle of the ladle is arranged toward the upper side of the ladle.

[0032] The method for improving the self-opening rate of the ladle nozzle and the ladle baking structure according to the embodiment of the present invention have the following beneficial effects, for example:

[0033] The method for improving the self-opening rate of the ladle nozzle includes controlling the nozzle material to be installed on the nozzle of the ladle; controlling the ladle to flip so that the nozzle faces upward; and controlling the hot air in the ladle to bake the nozzle material. During operation, after the nozzle material is installed, the ladle is flipped so that the nozzle faces upward, and the nozzle material can be baked while the hot air in the ladle moves upward, so that the moisture and tar in the nozzle material can be baked out, reducing the mixing of these moisture and tar with the drainage sand, and the particles react to generate a liquid phase, forming a sintering layer under the high temperature of the molten steel, and preventing the drainage sand at the nozzle material from being sintered, thereby improving the self-opening rate of the ladle nozzle.

[0034] The ladle baking structure comprises a ladle mouth and a nozzle material; wherein the nozzle material is installed at the nozzle of the ladle, and the nozzle of the ladle is arranged toward the upper side of the ladle. By arranging the nozzle toward the upper side, the hot air in the ladle moves toward the upper side while baking the nozzle material, thereby improving the performance of the nozzle material, and further improving the self-opening rate of the nozzle of the ladle. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 The structure of the ladle baking structure provided in the embodiment of the present invention is schematically shown. Figure 1 ;

[0037] Figure 2 The structure of the ladle baking structure provided in the embodiment of the present invention is schematically shown. Figure 2 ;

[0038] Figure 3 The present invention provides a method for improving the ladle nozzle self-opening rate according to the process flow diagram of the present invention;

[0039] Figure 4 A specific flow chart of step S100 is provided in an embodiment of the present invention;

[0040] Figure 5 A specific flow chart of step S200 is provided in an embodiment of the present invention;

[0041] Figure 6A specific flow chart of step S300 is provided in an embodiment of the present invention.

[0042] Icons: 100- ladle baking structure; 110- ladle; 111- sprue; 112- ladle mouth; 120- sprue material; 130- slide plate; 140- cover plate; 190- support surface. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0046] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0048] The terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0049] Unless otherwise clearly specified and limited, the terms "disposed", "connected" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0051] As mentioned in the background technology, in the steel rolling production process, the self-opening rate of the water inlet 111 of the ladle 110 plays a key role in affecting the quality of the molten steel and the production rhythm. The existing method to improve the self-opening rate is usually to use high-grade drainage sand to reduce sintering. However, for steel mills using ordinary drainage sand, the effect of improving the self-opening rate is limited.

[0052] Please refer to Figure 1-Figure 3 The method for improving the self-opening rate of the ladle nozzle and the ladle baking structure 100 provided in the embodiments of the present invention can solve the above problems, which will be described in detail below.

[0053] refer to Figure 1 and Figure 2 An embodiment of the present invention provides a ladle baking structure 100, which includes: a ladle 110 and a nozzle material 120; wherein the nozzle material 120 is installed on the nozzle 111 of the ladle 110, and the nozzle 111 of the ladle 110 is arranged toward the upper side of the ladle 110.

[0054] During operation, by setting the water inlet 111 toward the upper side, the hot air in the ladle 110 moves toward the upper side and can bake the water inlet material 120, ensuring that the water inlet material 120 is dry and oil-free, thereby improving the self-opening rate of the water inlet 111 of the ladle 110.

[0055] It is worth noting that because the nozzle material 120 is a consumable, with the erosion and scouring of the molten steel, the refractory material will become thinner and thinner, and even cracks or gaps will appear. It has a certain service life, which is generally 18-21 furnaces. When it is found that the upper nozzle does not meet the production safety requirements, a new refractory material (upper nozzle) must be replaced. The upper nozzle and the refractory mud that fixes it contain water and tar, which are easily volatilized under the high temperature of the molten steel and react with the drainage sand to form a sintered layer, affecting the self-opening rate. Therefore, when baking the nozzle material 120, the object is usually the new nozzle material 120 that has just been installed on the ladle 110. By drying the moisture and tar in the nozzle material 120 and preventing the drainage sand from being sintered by these debris, the subsequent operations of the nozzle material 120 can improve the self-opening rate of the nozzle 111 of the ladle 110.

[0056] Furthermore, because the nozzle 111 is not disposed in the middle of one end of the ladle 110, but is close to one side of the end of the ladle 110 and away from the other side of the same end of the ladle 110. In order to improve the outflow efficiency of the hot gas in the ladle 110, the ladle 110 can be tilted, thereby driving the nozzle 111 and the nozzle material 120 to tilt, so that the hot gas in the ladle 110 can be efficiently discharged, thereby improving the baking efficiency of the nozzle material 120.

[0057] It is worth noting that the inclination of the ladle 110 refers to the inclination of the ladle 110 relative to the support surface 190 at the lower side thereof, and the specific inclination angle is α, and α=10° to 20°; specifically, α=10° or α=12° or α=14° or α=16° or α=18° or α=20°, etc., and the specific angle of α is not limited. Preferably, α=15°, at which the baking efficiency of the nozzle material 120 is the highest.

[0058] In addition, in order to further improve the baking efficiency, the gate 111 can be closed by the slide plate 130 after the gate material 120 is installed, so that the hot air in the ladle 110 can be gathered at the inner side of the ladle 110 near the gate 111, and then the gate material 120 can be baked from the inner side of the ladle 110; at the same time, the ladle opening 112 of the ladle 110 is blocked to prevent the hot air from overflowing from the ladle opening 112, but it is necessary to ensure that the blocking time of the gate 111 will not be too long to prevent the air pressure in the ladle 110 from being too high and causing the hot air to overflow from the ladle opening 112. Specifically, the time will be affected by the temperature of the ladle, and the general blocking time is controlled at 1min≤t≤2min.

[0059] It is worth noting that a cover plate 140 may be connected to the ladle 110 , and the cover plate 140 may be used to seal the ladle opening 112 .

[0060] Furthermore, in order to avoid uneven baking of the nozzle material 120, the upper limit of the time for the slide plate 130 to block the nozzle 111 can be limited, thereby preventing the nozzle material 120 from being over-baked near the inside of the ladle 110 and the part far from the inside of the ladle 110 from being underbaked. In the actual production process, it is also possible to only bake the refractory of the inner nozzle (upper nozzle) of the ladle, without baking the outer nozzle (lower nozzle).

[0061] In this embodiment, the time for the slide plate 130 to block the water outlet 111 is t, wherein 1min≤t≤2min; specifically, t=1min or t=1.2min or t=1.4min or t=1.6min or t=1.8min or t=2min, etc. There is no limitation on the specific duration of t, which is mainly related to the temperature of the ladle, 1 minute at a high temperature and 2 minutes at a low temperature.

[0062] Please refer to the following table for details:

[0063]

[0064] refer to Figure 3-Figure 6 The embodiment of the present invention further provides a method for improving the self-opening rate of a ladle nozzle, which is applied to the ladle baking structure 100. The method for improving the self-opening rate of a ladle nozzle includes:

[0065] Step S100: Control the nozzle material 120 to be installed on the nozzle 111 of the ladle 110;

[0066] refer to Figure 4 , step S100 specifically includes:

[0067] Step S110: Control the slide plate 130 to open the water inlet 111;

[0068] Step S120: installing the nozzle material 120 on the nozzle 111;

[0069] Since the nozzle material 120 is a consumable material and has a certain service life, in order to improve the self-opening rate of the nozzle material 120 within the service life, the nozzle material 120 that has just been installed with the nozzle 111 is usually baked.

[0070] Step S130: sealing the ladle opening 112 of the ladle 110 ; by first sealing the ladle opening 112 , the probability of hot gas overflowing from the ladle opening 112 can be reduced, thereby allowing the hot gas to move toward the upper side and be discharged from the water inlet 111 .

[0071] Step S140: Control the slide plate 130 to close first to seal the water inlet 111;

[0072] Among them, the closing time of the slide plate 130 can be t, wherein 1min≤t≤2min; by closing the water inlet 111 through the slide plate 130, the hot air in the ladle 110 can be gathered at the inner side of the ladle 110 near the water inlet 111, thereby achieving the baking of the water inlet material 120 from the inner side of the ladle 110.

[0073] Step S150 : Control the slide plate 130 to open again to open the water inlet 111 .

[0074] It is worth noting that in order to prevent the ladle opening 112 from being blocked and affecting the subsequent hot gas discharge or material discharging operations, the ladle opening 112 of the ladle 110 may be opened at the same time as or after step 150 .

[0075] Step S200: Control the ladle 110 to flip so that the water inlet 111 faces upward;

[0076] refer to Figure 5 , step S200 specifically includes:

[0077] Step S210: Control the ladle 110 to flip until the water inlet 111 and the support surface 190 are at 90 degrees;

[0078] Step S220 : controlling the ladle 110 to flip 10° to 20° toward the side away from the nozzle 111 , so that the nozzle 111 and the support surface 190 are relatively inclined.

[0079] Step S300 : controlling the hot air in the ladle 110 to bake the nozzle material 120 .

[0080] refer to Figure 6 , step S300 specifically includes:

[0081] Step S310: obtaining the real-time temperature of the ladle 110;

[0082] Step S320: determining the baking time according to the real-time temperature;

[0083] Specifically, the baking time is calculated according to the formula: T=E / (AE), where T is the number of minutes of baking, E is the preset reference value, and A is the real-time temperature.

[0084] It should be noted that the temperature unit of A is ℃. Under normal conditions, the temperature of the ladle 110 is 1050℃~1300℃. According to several experiments and after cutting off a certain safety margin, the preset reference value E=900 can be determined, that is, when A1=1050℃, the baking time T1=900 / (1050-900)=6min; when A2=1300℃, the baking time T2=900 / (1300-900)=2.25min.

[0085] It is worth noting that the relationship between T and t is always maintained as T>t, so that the nozzle material 120 can continue to be baked when hot air flows out after the nozzle 111 is opened, thereby preventing the nozzle material 120 from being over-baked due to the hot air outflow when the nozzle 111 is opened when T=t.

[0086] Step S330: baking the nozzle material 120 according to the baking time.

[0087] In addition, when the baking time is reached, because the safety margin is taken into account in the calculation process of the baking time, and in order to improve the accurate judgment of the baking effect, it is also necessary to visually observe whether flames or water vapor come out of the water outlet 111. If not, stop baking; if so, continue baking until no flames or water vapor come out.

[0088] In summary, the method for improving the ladle nozzle self-opening rate and the ladle baking structure 100 provided by the embodiments of the present invention have at least the following advantages:

[0089] (1) It can utilize the characteristic that the hot air in the ladle 110 moves upward so that the hot air can be discharged and the nozzle material 120 can be baked at the same time, so that the moisture and tar in the nozzle material 120 can be baked out, the performance of the nozzle material 120 can be improved, and then the self-opening rate of the nozzle 111 of the ladle 110 can be improved.

[0090] (2) By tilting the ladle 110 , the hot air in the ladle 110 can be more easily gathered and discharged at the nozzle 111 , thereby improving the hot air discharge efficiency and further improving the baking efficiency of the nozzle material 120 .

[0091] (3) By sealing the water inlet 111 and the ladle mouth 112 before the ladle 110 is turned over, it helps to prevent the hot air from overflowing; at the same time, the hot air can be gathered at the water inlet 111 after the ladle 110 is turned over, so that the water inlet material 120 can be baked when the hot air is inside the ladle 110; and when the water inlet 111 is opened, the gathered hot air can be discharged more quickly, further improving the baking efficiency of the water inlet material 120.

[0092] (4) By limiting the time that the slide plate 130 blocks the nozzle 111, it is possible to improve the baking efficiency while avoiding uneven baking, so that the baking effects of different parts of the nozzle material 120 will not differ too much.

[0093] (5) By calculating the baking time and visually judging whether the baking is in place, the baking accuracy is further improved, thereby obtaining a better baking effect.

[0094] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for improving the self-opening rate of a ladle nozzle, characterized in that: include: A control nozzle material (120) is installed on a nozzle (111) of a ladle (110); Controlling the ladle (110) to flip so that the water inlet (111) faces upward; The hot air in the ladle (110) is controlled to bake the nozzle material (120).

2. The method for improving the self-opening rate of ladle nozzle according to claim 1, characterized in that: The step of controlling the ladle (110) to flip comprises: Controlling the ladle (110) to flip until the water inlet (111) and the support surface (190) are at 90 degrees; The ladle (110) is controlled to flip 10° to 20° toward a side away from the water inlet (111), so that the water inlet (111) and the support surface (190) are relatively inclined.

3. The method for improving the self-opening rate of ladle nozzle according to claim 1, characterized in that: The step of installing the control nozzle material (120) on the nozzle (111) of the ladle (110) comprises: Controlling the slide plate (130) to open so as to open the water inlet (111); The nozzle material (120) is installed on the nozzle (111).

4. The method for improving the self-opening rate of ladle nozzle according to claim 3, characterized in that: After the step of installing the nozzle material (120) on the nozzle (111), the step of controlling the nozzle material (120) to be installed on the nozzle (111) of the ladle (110) further includes: sealing a ladle opening (112) of the ladle (110); Controlling the slide plate (130) to close first to seal the water inlet (111); The slide plate (130) is controlled to open again to open the water inlet (111).

5. The method for improving the self-opening rate of ladle nozzle according to claim 4, characterized in that: In the step of controlling the slide plate (130) to close first to seal the water inlet (111), The closing time of the slide plate (130) is t, wherein 1min≤t≤2min.

6. The method for improving the self-opening rate of ladle nozzle according to claim 4, characterized in that: At the same time or after the step of controlling the slide plate (130) to open again to open the water inlet (111), the step of controlling the water inlet material (120) to be installed on the water inlet (111) of the ladle (110) further includes: The ladle opening (112) is opened.

7. The method for improving the self-opening rate of ladle nozzle according to claim 1, characterized in that: The step of controlling the hot air in the ladle (110) to bake the nozzle material (120) comprises: Obtaining the real-time temperature of the ladle (110); Determining the baking time according to the real-time temperature; The nozzle material (120) is baked according to the baking time.

8. The method for improving the self-opening rate of ladle nozzle according to claim 7, characterized in that: In the step of determining the baking time according to the real-time temperature, The baking time is calculated according to the formula: T=E / (AE), where T is the number of minutes of baking, E is the preset reference value, and A is the real-time temperature.

9. The method for improving the self-opening rate of ladle nozzle according to claim 7, characterized in that: After the step of baking the nozzle material (120) according to the baking time, the step of controlling the hot air in the ladle (110) to bake the nozzle material (120) further includes: Visually observe whether flames or water vapor emerge from the water outlet (111), and if not, stop baking; if so, continue baking until no flames or water vapor emerges.

10. A ladle baking structure, characterized in that: include: A ladle (110) and a nozzle material (120); wherein the nozzle material (120) is installed on the nozzle (111) of the ladle (110), and the nozzle (111) of the ladle (110) is arranged toward the upper side of the ladle (110).

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