Powder spraying device and steelmaking device

Abstract

A powder spraying device and a steelmaking device relate to the field of metallurgical equipment. The powder spraying device comprises an oxygen lance and a powder conveying pipe arranged outside the oxygen lance; the oxygen lance is provided with a spraying channel and an annular cavity arranged on the outer side of the spraying channel in a sleeving mode. The powder conveying pipe communicates with the annular cavity and is used for conveying powder. The spraying channel communicates with the annular cavity through a plurality of communicating holes formed in the circumferential direction of the spraying channel at intervals, and the diameters of the communicating holes are gradually increased along the direction away from the powder conveying pipe. According to the powder spraying device and the steelmaking device, when oxygen enters the converter through the spraying channel of the oxygen lance, the dephosphorizing agent enters the annular cavity through the powder conveying pipe and then enters the spraying channel through the communicating hole to enter the converter; therefore, under the condition that the diameter of the communicating hole is gradually increased along with the distance away from the powder conveying pipe, the flow of powder moving into the spraying channel at the position away from the powder conveying pipe is increased, the powder is evenly distributed in the cross section of the spraying channel and enters the spraying channel, it is guaranteed that the powder evenly falls into the converter to be dispersed, and the dephosphorization effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of metallurgical equipment, in particular, relates to a powder spraying device and a steelmaking device. BACKGROUND

[0002] During the converter operation, the dephosphorizing agent such as lime or limestone is sprayed into the molten steel by the oxygen lance to remove phosphorus in the molten steel. However, the dephosphorizing agent is easily gathered and wrapped by the molten steel when entering the molten pool from the oxygen lance, which is difficult to be uniformly dispersed into the molten steel, resulting in uneven dephosphorizing effect.

[0003] Therefore, a device capable of uniformly and evenly delivering the dephosphorizing agent into the converter is needed to solve the above problems. CONTENT OF THE UTILITY MODEL

[0004] The present application aims to provide a powder spraying device and a steelmaking device, which can improve the flow of powder moving into the spraying channel far from the powder delivery pipe, make the powder uniformly distributed in the cross section of the spraying channel, and ensure the powder to fall into the converter uniformly and evenly to improve the dephosphorizing effect.

[0005] The present application is achieved in the following manner:

[0006] The present application provides a powder spraying device, comprising:

[0007] The oxygen lance has a spraying channel and an annular cavity arranged outside the spraying channel;

[0008] The powder delivery pipe is arranged outside the oxygen lance and communicates with the annular cavity for delivering powder;

[0009] The spraying channel and the annular cavity are communicated by a plurality of communication holes arranged along the circumference of the spraying channel, and the diameter of the communication hole gradually increases away from the powder delivery pipe.

[0010] In some optional embodiments, the bottom height of the communication hole gradually decreases away from the powder delivery pipe.

[0011] In some optional embodiments, the bottom height of the annular cavity is lower than the bottom height of the communication hole.

[0012] In some optional embodiments, the communication position of the powder delivery pipe with the annular cavity is staggered with the communication hole.

[0013] In some optional embodiments, the oxygen lance comprises a spraying pipe, a hollow cylindrical baffle, an annular top plate and an annular bottom plate. The top plate and the bottom plate are arranged in height direction and connected to the outer wall of the spraying pipe. The baffle is arranged outside the spraying pipe and connected to the top plate and the bottom plate. The spraying pipe, the baffle, the top plate and the bottom plate form the annular cavity. The communication hole is arranged on the spraying pipe, and the powder delivery pipe penetrates and connects the baffle.

[0014] In some optional embodiments, the outer wall of the injection pipe is further connected with a wear-resistant lining plate located in the annular cavity, and the wear-resistant lining plate is provided with through holes corresponding to the communication holes.

[0015] In some optional embodiments, the communication position between the powder delivery pipe and the annular cavity is located at the midpoint of the line connecting two adjacent communication holes.

[0016] In some optional embodiments, a cooling cavity is arranged below the annular cavity and sleeved on the outside of the injection channel, and the cooling cavity is connected with a water inlet channel and a water outlet channel at two ends respectively.

[0017] In some optional embodiments, the through rod corresponding to each communication hole and a driving mechanism for driving each through rod to move axially are included, and the through rod passes through the corresponding communication hole when moving axially.

[0018] The application also provides a steelmaking device, comprising:

[0019] a converter;

[0020] The powder injection device described above, the oxygen lance penetrates through the top of the converter and extends into the converter, so that the injection channel communicates with the inside of the converter.

[0021] The beneficial effects of the application are as follows: the powder injection device provided by the application comprises an oxygen lance and a powder delivery pipe arranged outside the oxygen lance; the oxygen lance has an injection channel and an annular cavity sleeved on the outside of the injection channel, and the powder delivery pipe communicates with the annular cavity for delivering powder; the injection channel and the annular cavity are communicated through a plurality of communication holes arranged circumferentially and spaced apart along the injection channel, and the diameter of the communication hole gradually increases away from the powder delivery pipe. The powder injection device and the steelmaking device provided by the application can make the dephosphorizing agent pass into the annular cavity through the powder delivery pipe and then enter the injection channel of the oxygen lance and enter the converter, so as to improve the flow of the powder moving into the injection channel away from the powder delivery pipe under the condition that the diameter of the communication hole gradually increases away from the powder delivery pipe, make the powder uniformly distributed in the cross section of the injection channel and enter the injection channel, and ensure that the powder falls down uniformly into the converter and is dispersed to improve the dephosphorizing effect. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0023] Figure 1 The partial cross-sectional structure schematic diagram of the steelmaking device provided for Embodiment 1 of the application;

[0024] Figure 2 A partial cross-sectional structure schematic diagram of the powder injection device in the steelmaking device provided in Embodiment 1 of the present application is shown in the figure.

[0025] Figure 3 A structure schematic diagram of the wear-resistant lining plate close to the side of the powder conveying pipe in the steelmaking device provided in Embodiment 1 of the present application is shown in the figure.

[0026] Figure 4 A structure schematic diagram of the wear-resistant lining plate far from the side of the powder conveying pipe in the steelmaking device provided in Embodiment 1 of the present application is shown in the figure.

[0027] Figure 5 A partial cross-sectional structure schematic diagram of the powder injection device in the steelmaking device provided in Embodiment 2 of the present application is shown in the figure.

[0028] Figure 6 A partial cross-sectional structure schematic diagram of the powder injection device in the steelmaking device provided in Embodiment 3 of the present application is shown in the figure.

[0029] In the figure: 100, oxygen lance; 110, injection channel; 120, annular cavity; 130, injection pipe; 140, baffle; 150, top plate; 160, bottom plate; 170, wear-resistant lining plate; 180, through hole; 200, powder conveying pipe; 210, communication hole; 220, dredging rod; 230, driving mechanism; 300, cooling cavity; 310, water inlet channel; 320, water outlet channel; 400, converter. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts are within the scope of protection of the present application.

[0032] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0033] In the description of the application, it needs to be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the application is used, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0035] In the description of the application, it also needs to be explained that unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise explicitly specified and limited, the first feature "above" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] The features and performance of the powder spraying device and the steelmaking device of the application are further described in detail below in conjunction with the embodiments.

[0038] Example 1

[0039] As Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the embodiment of the present application provides a steelmaking device, which comprises a converter 400 and a powder spraying device. The powder spraying device comprises an oxygen lance 100 and a powder conveying pipe 200 connected to the oxygen lance 100. The oxygen lance 100 has a spraying channel 110 and an annular cavity 120 sleeved outside the spraying channel 110. The powder conveying pipe 200 is arranged outside the oxygen lance 100 and communicates with the annular cavity 120 for conveying powder. The bottom of the oxygen lance 100 penetrates the top of the converter 400 and extends into the converter 400 so that the spraying channel 110 communicates with the converter 400.

[0040] The oxygen lance 100 comprises a spraying pipe 130, and the spraying channel 110 is arranged in the spraying pipe 130. A hollow cylindrical baffle 140, an annular top plate 150 and an annular bottom plate 160 are sleeved outside the outer wall of the spraying pipe 130. The top plate 150 and the bottom plate 160 are spaced apart along the height direction and connected to the outer wall of the spraying pipe 130. The top and bottom of the baffle 140 are connected to the top plate 150 and the bottom plate 160, respectively. The annular cavity 120 is formed by the spraying pipe 130, the baffle 140, the top plate 150 and the bottom plate 160. The powder conveying pipe 200 penetrates and connects the baffle 140 to communicate with the annular cavity 120. The spraying channel 110 and the annular cavity 120 communicate through seven communication holes 210 arranged along the circumference of the spraying channel 110. The communication holes 210 are arranged on the spraying pipe 130. The outer wall of the spraying pipe 130 is further connected to an annular wear-resistant lining plate 170 located in the annular cavity 120. The wear-resistant lining plate 170 is provided with through holes 180 corresponding to the communication holes 210. The communication holes 210 are staggered with the communication position of the powder conveying pipe 200 with the annular cavity 120. The diameter of the communication holes 210 gradually increases away from the powder conveying pipe 200. The bottom height of the communication holes 210 gradually decreases away from the powder conveying pipe 200. The bottom height of the annular cavity 120 is lower than the bottom height of the communication holes 210. The communication position of the powder conveying pipe 200 with the annular cavity 120 is located at the midpoint of the line connecting two adjacent communication holes 210.

[0041] The steelmaking device provided by the embodiment of the application is provided with a powder spraying device connected with the converter 400, the powder spraying device comprises an oxygen lance 100 and a powder conveying pipe 200 connected with the oxygen lance 100, the oxygen lance 100 has a spraying channel 110 connected with the converter 400 for conveying oxygen and powder and an annular cavity 120 sleeved outside the spraying channel 110, the powder conveying pipe 200 is communicated with the annular cavity 120 for conveying powder, and the oxygen lance 100 is connected with a gas source at one end away from the converter 400 to provide oxygen for the converter 400 in the smelting process, so that the oxygen stirs the molten pool to improve the smelting kinetics condition and decarburize at the same time. Meanwhile, the dephosphorization powder such as calcium oxide, limestone and the like is conveyed into the annular cavity 120 by using the powder conveying pipe 200, and the dephosphorization powder passes through the through holes 180 on the wear-resistant lining plate 170 and then enters the spraying channel 110 from the communication holes 210 to be sprayed and dropped into the converter 400 with the carrier oxygen to participate in the dephosphorization reaction. Since the communication holes 210 are arranged along the circumference of the spraying channel 110 at intervals, the amount and pressure of the powder passing through the communication holes 210 close to the powder conveying pipe 200 are large, and the amount and pressure of the powder passing through the communication holes 210 away from the powder conveying pipe 200 are small. When the diameters of the communication holes 210 gradually increase away from the powder conveying pipe 200, the flow rate of the powder in the communication holes 210 away from the powder conveying pipe 200 moving into the spraying channel 110 can be improved, so that the powder is uniformly distributed in the cross section of the spraying channel 110, and the uniformity of the powder on the surface of the molten pool is ensured.

[0042] The bottom height of the communication hole 210 gradually decreases away from the powder conveying pipe 200, so that the powder in the communication hole 210 away from the powder conveying pipe 200 can more quickly enter the spraying channel 110 through the communication hole 210, and the powder is further uniformly distributed in the cross section of the spraying channel 110, and the uniformity of the powder on the surface of the molten pool is ensured.

[0043] The communication position of the powder conveying pipe 200 and the annular cavity 120 is staggered with the communication hole 210, so that the powder conveyed in the powder conveying pipe 200 can not directly rush into the spraying channel 110 through the communication hole 210 to cause uneven powder spraying. Meanwhile, the communication position of the powder conveying pipe 200 and the annular cavity 120 is aligned with the communication hole 210, so that the material flow directly washes the inner wall of the spraying channel 110 to cause the spraying channel 110 to be seriously worn and affect the service life.

[0044] The bottom of the annular cavity 120 is lower than the bottom of the communication hole 210, so that the lower space of the annular cavity 120 can be used to temporarily store the powder, which can form a powder cushion layer in the annular cavity 120, reduce the wear of the high-speed powder delivered by the powder delivery pipe 200 on the wall of the annular cavity 120, and improve the service life of the oxygen lance 100; the outer wall of the injection pipe 130 is also connected with a wear-resistant lining plate 170 located in the annular cavity 120, and the wear-resistant lining plate 170 is provided with a through hole 180 corresponding to the communication hole 210, which can use the wear-resistant lining plate 170 to buffer the wear of the high-speed powder delivered by the powder delivery pipe 200 on the wall of the annular cavity 120, and improve the service life of the oxygen lance 100. In other alternative embodiments, a wear-resistant coating can also be provided on the inner wall of the annular cavity 120 to improve the wear resistance and prolong the service life.

[0045] The communication between the powder delivery pipe 200 and the annular cavity 120 is located at the midpoint of the line connecting two adjacent communication holes 210, which can not only reduce the wear of the injection channel 110, but also improve the uniformity of the distribution of the powder in the cross section of the injection channel 110. In other alternative embodiments, the powder delivery pipe 200 can also not be located at the midpoint of the line connecting two adjacent communication holes 210, for example, it can be biased towards one of the communication holes 210, which can also reduce the wear of the injection channel 110 and improve the uniformity of the distribution of the powder in the cross section of the injection channel 110 to a certain extent.

[0046] In this embodiment, the powder delivery pipe 200 is inclined at an angle of 45° to the horizontal plane and the lower end is close to the oxygen lance 100, which facilitates the delivery of the powder to the annular cavity 120 according to gravity. The included angle between the powder delivery pipe 200 and the injection channel 110 of the oxygen lance 100 can be 30° to 60°, such as 32°, 35°, 38°, 40°, 44°, 49°, 52°, 56°, etc. In other alternative embodiments, the powder delivery pipe 200 can also be horizontally arranged, and a driving device can be provided on the powder delivery pipe 200 to provide the moving power of the powder.

[0047] In this embodiment, the powder delivery pipe 200 is made of wear-resistant stainless steel, which has good wear resistance and long service life, and the inner diameter of the powder delivery pipe 200 is 50mm. In other alternative embodiments, the inner diameter of the powder delivery pipe 200 can also be 10-150mm, such as 60mm, 80mm, 100mm, 120mm.

[0048] In other alternative embodiments, the number of communication holes 210 can also be two, three, four, five, six, seven or more than eight.

[0049] In other alternative embodiments, the connecting holes 210 may be divided into two groups, three groups or more, with each group of connecting holes 210 arranged axially along the injection channel 110, and each group of connecting holes 210 including at least two connecting holes 210 arranged circumferentially along the injection channel 110.

[0050] Example 2

[0051] like Figure 5 As shown, this application provides a steelmaking apparatus, which has a structure that is generally the same as the steelmaking apparatus provided in Embodiment 1. The difference is that, in this embodiment, a cooling chamber 300 is provided below the annular cavity 120 and sleeved on the outside of the injection channel 110. The two ends of the cooling chamber 300 are respectively connected to the water inlet channel 310 and the water outlet channel 320. The cooling chamber 300 is isolated from the injection channel 110.

[0052] The steelmaking apparatus provided in this application embodiment has a cooling chamber 300 sleeved outside the injection channel 110 below the annular cavity 120. The cooling chamber 300 is connected to an inlet channel 310 and an outlet channel 320 at both ends, which allows cooling water to be easily introduced into the cooling chamber 300 through the inlet channel 310 to cool the injection channel 110 and the annular cavity 120 during operation, and then discharged through the outlet channel 320. This cools the injection channel 110 and the annular cavity 120 of the oxygen lance 100 to cope with the high temperature environment in the converter and improve the service life of the oxygen lance 100.

[0053] Example 3

[0054] like Figure 6 As shown, this application provides a steelmaking apparatus, which has a structure that is generally the same as the steelmaking apparatus provided in Embodiment 1. The difference is that in this embodiment, the annular cavity 120 is also provided with a clearing rod 220 arranged coaxially with each connecting hole 210. Each clearing rod 220 is connected to a driving mechanism 230 for driving it to move axially. When each clearing rod 220 moves axially, it passes through each corresponding connecting hole 210. In this embodiment, the driving mechanism 230 is an electric push rod.

[0055] The steelmaking apparatus provided in this application embodiment has a dredging rod 220 arranged coaxially with each connecting hole 210 in the annular cavity 120. This allows the operator to use the drive mechanism 230 to drive the dredging rod 220 to move axially through the corresponding connecting hole 210 for dredging, thereby avoiding the powder from clogging the connecting hole 210 after a long feeding operation and affecting the powder delivery, thus improving the service life of the oxygen lance 100.

[0056] In other alternative embodiments, the drive mechanism 230 may also be a linear drive mechanism such as a motor lead screw or a hydraulic cylinder.

[0057] The embodiments described above are only part of the embodiments of the present application, rather than all the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

Claims

1. A powder spraying device, characterized in that, The invention relates to a powder injection device for a converter, comprising: an oxygen lance having a jet channel and an annular cavity arranged outside the jet channel; a powder delivery pipe arranged outside the oxygen lance and communicating with the annular cavity for delivering powder; the jet channel and the annular cavity are communicated by a plurality of communication holes arranged circumferentially along the jet channel, the diameter of the communication holes gradually increases away from the powder delivery pipe.

2. The duster of claim 1, wherein the bottom height of the communication holes gradually decreases away from the powder delivery pipe.

3. The duster of claim 1, wherein the bottom height of the annular cavity is lower than that of the communication holes.

4. The duster of claim 1, wherein the communication position of the powder delivery pipe with the annular cavity is staggered with the communication holes.

5. The duster of claim 1, wherein, The oxygen lance comprises a jet pipe, a hollow cylindrical baffle, an annular top plate and an annular bottom plate, the top plate and the bottom plate are arranged in height direction and connected to the outer wall of the jet pipe, the baffle is arranged outside the jet pipe and connected to the top plate and the bottom plate at the top and bottom respectively, the jet pipe, the baffle, the top plate and the bottom plate form the annular cavity, the communication holes are arranged on the jet pipe, and the powder delivery pipe penetrates and connects the baffle.

6. The duster of claim 5, wherein The outer wall of the jet pipe is further connected with a wear-resistant lining plate located in the annular cavity, and the wear-resistant lining plate is provided with through holes corresponding to the communication holes.

7. The duster of claim 1, wherein The communication position of the powder delivery pipe with the annular cavity is located at the midpoint of the line connecting two adjacent communication holes.

8. The duster of claim 1, wherein, A cooling cavity is arranged below the annular cavity and arranged outside the jet channel, and the two ends of the cooling cavity are respectively connected with water inlet channel and water outlet channel.

9. The duster of claim 1, wherein, Further comprising a corresponding dredging rod for each communication hole and a driving mechanism for driving each dredging rod to move axially, the dredging rod passes through the corresponding communication hole when moving axially.

10. A steelmaking plant, characterized in that, The invention relates to a powder injection device for a converter, comprising: a converter; the powder injection device as claimed in any one of claims 1-9, the oxygen lance penetrates the top of the converter and extends into the converter, so that the jet channel communicates with the inside of the converter.

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