Tundish baking device

Abstract

A tundish baking device comprises a combustion-supporting pipe corresponding to a steel flowing channel of a tundish, the inlet end of the combustion-supporting pipe is communicated with a compressed air pipe, the combustion-supporting pipe is externally connected with a compressed air source through the compressed air pipe, a tundish cover of the tundish is provided with a reserved opening corresponding to the combustion-supporting pipe, and the combustion-supporting pipe penetrates through the reserved opening and extends into the tundish. Wherein the lower part is bent at an angle, and the outlet end of the combustion-supporting pipe correspondingly extends into the port of the steel flowing channel. According to the utility model, the interior of the channel is more sufficiently baked, the baking temperature and the temperature rising speed in the channel are improved, the temperature drop of tundish steel is reduced, the quality of molten steel is improved, and the production cost of a refining process is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of continuous casting, and in particular relates to a baking device for a channel type tundish. Background Art

[0002] In the continuous casting process, the tundish is the middle link of the steelmaking production process and the connection point from intermittent operation to continuous operation. As a transition container between the ladle and the crystallizer, it can realize certain metallurgical functions, and has the functions of reducing pressure, stabilizing flow, removing inclusions, storing and adjusting the temperature of molten steel. In continuous casting, the control of molten steel temperature is very important, especially when the molten steel level in the tundish is insufficient at the beginning of pouring, and its electromagnetic heating function cannot be put into use. At this time, the molten steel temperature is mainly achieved by controlling the temperature drop of the molten steel in the tundish, and the baking quality of the tundish directly determines the thermal stability of the tundish, which directly affects the temperature drop of the molten steel in the tundish, and then determines the stability of the casting machine and the temperature of the steel. In the prior art, there is a problem of uneven baking in the baking of the tundish, especially in the steel flow channel of the channel-type tundish. The temperature in a normal tundish cavity can reach 800-1000°C after 4-6 hours of baking. However, at this time, the temperature in the steel flow channel, especially in its center, is generally only 300-400°C because the gas is not easy to reach it. This is far below the target temperature (the target temperature is 800-1100°C), and is a dead zone during baking of the tundish. The temperature in the steel flow channel is too low and cannot meet the baking quality required by the production process. This not only affects the stability of the casting machine and the control of the molten steel temperature, hindering production, but also a large amount of water vapor will remain in the channel, polluting the subsequent molten steel. Utility Model Content

[0003] The utility model aims to provide a tundish baking device which improves the baking quality in a steel flow channel, so as to solve the technical problem that the temperature in the steel flow channel of the existing channel-type tundish is relatively low after baking.

[0004] To achieve the above purpose, the specific technical solution of the utility model is as follows:

[0005] A tundish baking device comprises a combustion-supporting pipe corresponding to a steel flow channel of the tundish, the inlet end of the combustion-supporting pipe is connected to a compressed air pipe, the combustion-supporting pipe is connected to an external compressed air source through the compressed air pipe, a reserved opening corresponding to the combustion-supporting pipe is provided on the tundish cover, the combustion-supporting pipe passes through the reserved opening and extends into the tundish, wherein the lower part is bent at an angle, and the outlet end of the combustion-supporting pipe corresponds to the port extending into the steel flow channel.

[0006] Furthermore, a communicating gas pipe is added to the inlet end of the combustion-supporting pipe, the gas pipe and the compressed air pipe are connected in parallel to the inlet end of the combustion-supporting pipe, and the combustion-supporting pipe is externally connected to a corresponding combustion-supporting gas source through the gas pipe.

[0007] Furthermore, a separate pressure regulating valve is provided on each pipeline connected to the inlet end of the combustion-supporting pipe, including an air pressure regulating valve provided on the compressed air pipe and a gas pressure regulating valve provided on the gas pipe.

[0008] Furthermore, a nozzle is provided at the outlet end of the combustion-supporting pipe, and the two are detachably fixedly connected.

[0009] Furthermore, the combustion-supporting tube is provided with a T-shaped fixed sleeve, which includes a T-shaped upper end crossbeam and a vertical pipe sleeve. The pipe sleeve is a hollow tube body, and its upper end is connected to the lower surface of the crossbeam. The crossbeam is provided with a sleeve hole corresponding to the pipe sleeve. The combustion-supporting tube passes through the middle inner cavity of the pipe sleeve, and its upper end passes through the top of the crossbeam sleeve hole. The outer ring of the pipe sleeve is provided with a corresponding locking ring.

[0010] Furthermore, a corresponding fixing device is provided below the fixing sleeve, and the combustion-supporting tube is detachably fixed to the ladle cover of the intermediate ladle through the fixing device, and the fixing device includes a fixing clamp and a fuel tube clamp, wherein the fixing clamp is clamped on the ladle cover, the fuel tube clamp is fixedly connected to the fixing clamp, and the combustion-supporting tube is clamped on the fuel tube clamp.

[0011] The lockhole that is formed on the upper and lower ends of the sliding panel is formed, and the sliding panel also is a plurality of pairs of locking plates, each of which is connected to the other end of the sliding panel, and the locking plate is connected to the hinge parts of each piece.

[0012] Furthermore, the combustion-supporting tube is made of flexible stainless steel material, and the angle between the upper and lower sections after bending is not less than 90°. The surrounding area of ​​the ladle cover and the reserved opening are protected against fire leakage using corresponding materials, and the pressure of the compressed air connected to the combustion-supporting tube is 0.15-0.20MPa.

[0013] The utility model discloses a tundish baking device which forms an airflow by introducing compressed air, thereby increasing the introduction of air and fuel gas into the channel of the channel-type tundish, and at the same time increasing the density of the air and fuel gas in the channel, so that the channel is more fully baked, and the baking temperature in the channel and the speed of temperature rise are increased, so that the channel can not only be baked more evenly, but also have a higher temperature after baking, thereby ensuring the baking temperature and removing residual water vapor in the channel, reducing the temperature drop of molten steel in the tundish and lowering the upper steel temperature, while improving the quality of molten steel and reducing the production cost of the refining process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the internal structure of the tundish when the tundish baking device of the utility model is used;

[0015] Figure 2 It is a side view structural diagram of the tundish baking device of the utility model when in use;

[0016] Figure 3 It is an enlarged schematic diagram of the fixing sleeve of the tundish baking device of the utility model when it is used alone;

[0017] Figure 4 It is an enlarged schematic diagram of the fixing device of the tundish baking device of the utility model when in use;

[0018] Figure 5 This is a comparison chart of test data for the use of the tundish baking device of the utility model;

[0019] Explanation of marks in the figure: 1. Combustion-supporting pipe; 2. Compressed air pipe; 3. Gas pipe; 4. Tundish; 41. Tundish cover; 42. Reserved opening; 43. Steel flow channel; 5. Nozzle; 6. Pressure regulating valve; 61. Air pressure regulating valve; 62. Gas pressure regulating valve; 7. Fixed sleeve; 71. Crossbeam; 72. Pipe sleeve; 73. Locking ring; 74. Sleeve hole; 8. Fuel pipe clamp; 9. Fixed clamp; 91. Upper clamp; 911. Upper handle; 912. Fixed rod; 913. Lower clamp handle; 92. Lower clamp; 921. Lower handle; 922. Sliding rod; 923. Upper clamp handle; 93. Slide; 94. Sliding column; 95. Guide rod; 96. Spring; 97. Through hole. DETAILED DESCRIPTION

[0020] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of a tundish baking device of the utility model in conjunction with the accompanying drawings.

[0021] like Figure 1-4As shown, the utility model of the tundish baking device is mainly used for auxiliary baking of the steel flow channel 43 of the tundish 4 during baking, and includes a combustion-supporting tube 1, which corresponds to the steel flow channel 43 of the tundish 4, and its radial dimension is much smaller than the radial dimension of the steel flow channel 43, and its inlet end is connected to a compressed air pipe 2, and the outlet end of the compressed air pipe 2 is connected to the inlet end of the combustion-supporting tube 1, and the inlet end of the compressed air pipe 2 is externally connected to the compressed air source, and the combustion-supporting tube 1 is externally connected to the compressed air source through the compressed air pipe 2. The tube 1 is made of flexible stainless steel material, and is bent at an angle in the middle and lower parts. After the bending, the angle between the upper and lower sections is not less than 90 degrees. When it is convenient to extend it into the tundish 4 from the upper part during baking, its outlet end corresponds to the port of the steel flow channel 43. When in use, the outlet end of the combustion-supporting tube 1 needs to extend into the cavity of the tundish 4, and correspond to the port of the steel flow channel 43 of the tundish 4, and slightly extend into the port of the steel flow channel 43, so that when the tundish 4 is baked, compressed air can be passed into the steel flow channel 43 at the same time, and high The compressed air with a high flow rate is passed into the tundish 4, which can not only drive the flame airflow of the roaster into the steel flow channel 43, but also the compressed air has a high oxygen content, which can also assist combustion, so that the flame passed by the roaster into the inner cavity of the tundish 4, especially the steel flow channel 43, burns faster and more fully, thereby accelerating the baking of the tundish 4, and can also make the temperature of the waste heat of the tundish 4 higher, improve the baking temperature in the steel flow channel 43, so that the residual water vapor in the steel flow channel 43 is removed to prevent it from contaminating the molten steel composition in subsequent processes. A reserved opening 42 corresponding to the combustion-supporting tube 1 is provided on the cover 41 of the tundish 4. The combustion-supporting tube 1 is made of a refractory flexible stainless steel tube material, which is convenient for it to adjust its bending angle according to the needs of different tundishes 4, and it is also convenient for it to pass through the reserved opening 42 and extend into the tundish 4 in subsequent use. The cover 41 of the tundish 4 and the reserved opening 42 are all made of corresponding materials for fire leakage protection. In this embodiment, asbestos is used as the fire leakage protection of the cover 41 and the reserved opening 42.

[0022] A connected gas pipe 3 is additionally provided at the inlet end of the combustion-supporting tube 1. The gas pipe 3 and the compressed air pipe 2 are connected in parallel at the inlet end of the combustion-supporting tube 1. The end of the gas pipe 3 connected to the inlet end of the combustion-supporting tube 1 is its outlet end. The inlet end is externally connected to a combustion-supporting gas source. The combustion-supporting tube 1 is externally connected to a corresponding combustion-supporting gas source through the gas pipe 3. When baking the intermediate ladle 4, when the compressed air pipe 2 passes compressed air into the combustion-supporting tube 1, the gas pipe 3 simultaneously passes corresponding combustion-supporting gas into the combustion-supporting tube 1. The compressed air and combustion-supporting gas in the internal channel of the combustion-supporting tube 1 are simultaneously passed into the corresponding steel flow channel 43. At this time, it not only drives the gas flow sprayed by the baking device for heating the intermediate ladle 4 into the steel flow channel 43, but also increases the density of oxygen and fuel gas in the steel flow channel 43, so that the flame temperature in the steel flow channel 43 is higher, thereby enhancing the baking in the steel flow channel 43.

[0023] A separate pressure regulating valve 6 is provided on each pipeline connected to the inlet end of the combustion-supporting pipe 1, and the flow rate of the gas in the corresponding pipeline can be individually adjusted through the pressure regulating valve 6. In this embodiment, the inlet end of the combustion-supporting pipe 1 is connected in parallel with a compressed air pipe 2 and a gas pipe 3, and separate pressure regulating valves 6 are respectively provided on the compressed air pipe 2 and the gas pipe 3, wherein the compressed air pipe 2 is provided with an air pressure regulating valve 61, and the gas pipe 3 is provided with a gas pressure regulating valve 62. The use of the pressure regulating valve 6 can flexibly adjust the inflow ratio of each gas in the combustion-supporting pipe 1, so that the mixing is more uniform, and the baking temperature can also be made more uniform when the flow steel channel 43 is passed to assist in baking.

[0024] A nozzle 5 is provided at the outlet end of the combustion-supporting tube 1. The nozzle 5 is made of a fire-resistant material. The nozzle 5 and the combustion-supporting tube 1 are detachably fixedly connected. The size of the gas or flame sprayed from the combustion-supporting tube 1 can be adjusted through the nozzle 5 as needed. Nozzles 5 with different aperture specifications can also be selected according to the different gases introduced into the combustion-supporting tube 1. When multiple gases are introduced into the combustion-supporting tube 1, the use of the nozzle 5 can also make the various gases mixed more evenly before being sprayed out.

[0025] A T-shaped fixing sleeve 7 is provided on the combustion-supporting tube 1. The fixing sleeve 7 includes a T-shaped upper end crossbeam 71 and a vertical pipe sleeve 72. The pipe sleeve 72 is a hollow tube body with openings at both ends. The upper end of the pipe sleeve 72 is connected to the lower surface of the crossbeam 71. A corresponding sleeve hole 74 is provided at a position corresponding to the inner cavity of the pipe sleeve 72 on the crossbeam 71. The fixing sleeve 7 is sleeved on the middle and upper part of the combustion-supporting tube 1. The combustion-supporting tube 1 passes through the middle inner cavity of the pipe sleeve 72, and its upper end passes through the upper part of the sleeve hole 74 of the crossbeam 71. The fixing sleeve 7 can slide up and down on the outer ring of the combustion-supporting tube 1. 72, the outer ring of which is provided with a corresponding locking ring 73, the fixing sleeve 7 can be fixed on the combustion-supporting tube 1 by the locking ring 73, the fixing sleeve 7 can limit the depth of the combustion-supporting tube 1 extending into the tundish 4, and the distances from the steel flow channel 43 to the tundish cover 41 of different specifications of tundishes 4 are different. By adjusting the distance from the fixing sleeve 7 to the lower part of the combustion-supporting tube 1, the depth of the combustion-supporting tube 1 extending into the tundish 4 is limited, so that the outlet end can always correspond to the port of the steel flow channel 43, and the fixing sleeve 7 is clamped at the reserved opening 42 reserved on the cover 41 through its cross beam 71.

[0026] On the combustion-supporting tube 1, a corresponding fixing device is provided below the fixing sleeve 7, and the two are detachably fixedly connected. The combustion-supporting tube 1 can be fixed on the bag cover 41 of the middle bag 4 through the fixing device. The fixing device includes a fixing clamp 9 and a combustion tube clamp 8. The fixing clamp 9 includes an upper clamp 91 and a lower clamp 92. The upper ends of the two are handle ends, and the lower ends are clamping ends. The middle is connected by a connecting rod, wherein the handle end of the upper clamp 91 is provided with an upper handle 911, and its connecting rod is a fixing rod 912, and its clamping end is provided with a lower clamp handle 913. The ends of the upper handle 911 and the lower clamp handle 913 are respectively connected to the upper and lower ends of the fixing rod 912, and are all fixedly connected. The lower clamp 92 is shorter than the upper clamp 91, and is provided on the upper handle 911 and the lower clamp handle 913. The lower handle 921 of the lower clamp 92 is provided with a lower handle 921, and its connecting rod is a sliding rod 922, and its clamping end is provided with an upper clamp handle 923. The ends of the lower handle 921 and the upper clamp handle 923 are respectively fixedly connected to the upper and lower ends of the sliding rod 922. A hollow vertical slide 93 is provided on the fixed rod 912, and a sliding column 94 corresponding to the slide 93 is provided on the sliding rod 922. The bottom end of the sliding column 94 is fixedly connected to the corresponding side wall of the sliding rod 922. The lower clamp 92 can slide up and down on the side of the fixed rod 912 through the sliding column 94. The lower handle 921 of the lower clamp 92 is located below the upper handle 911 of the upper clamp 91, and a guide rod 95 is provided between the two. The guide rod 95 is arranged on one side between the two and close to the connecting rod. The upper end of the upper handle 911 is fixedly connected to the lower surface of the upper handle 911, and the lower handle 921 is provided with a through hole 97 corresponding to the guide rod 95. The lower end of the guide rod 95 penetrates into the through hole 97, and a corresponding spring 96 is provided on the periphery of the guide rod 95. The fuel pipe clamp 8 is connected to the side wall of the fixed rod 912, and the bottom end of the fuel pipe clamp 8 is fixed to the middle and upper part of the other side wall of the fixed rod 912 corresponding to the lower clamp 92. The combustion-supporting pipe 1 can be fixed to the side of the fixing device by the clamping of the fuel pipe clamp 8, and the two are detachably fixedly connected. In the normal state, under the action of the spring 96, the upper handle 911 and the lower handle 921 are in a separated state. At this time, the upper clamp handle 923 is fitted with the lower clamp handle 913, which is used to align the upper handle 911 and the lower handle 921 apply force to bring the two closer to each other, open the upper clamp handle 923 and the lower clamp handle 913, and place the two correspondingly on the upper and lower sides of the package cover 41, and release the force on the handles. At this time, under the action of the spring 96, the fixed clamp 9 is clamped at the corresponding position of the package cover 41 through the upper clamp handle 923 and the lower clamp handle 913, and the combustion-supporting tube 1 is correspondingly clamped on the fuel tube clamp 8. At this time, the combustion-supporting tube 1 is fixed by the fixing device, so that it will not deviate from the position during ventilation due to the excessive recoil when the gas is discharged at the outlet end, so that the outlet end of the combustion-supporting tube 1 can always correspond to the port of the flow steel channel 43 when in use. At this time, the fixed sleeve 7 can prevent the combustion-supporting tube 1 from sliding down when it cannot be clamped at the fuel tube clamp 8.

[0027] The test shows that the pressure of the compressed air connected to the combustion-supporting pipe 1 is preferably 0.15-0.20 MPa. Figure 5 As shown, after 28 field practice measurements, the average temperature drop of molten steel from the large ladle to the tundish 4 was about 57.97°C before the improvement, and the average temperature drop was about 42.77°C after the improvement, which was reduced by about 15.2°C, a decrease of 26.2%.

[0028] When in use, first adjust the bending angle and length of the combustion-supporting tube 1 according to the needs of the tundish 4, then extend it into the tundish 4 through the reserved opening 42, so that its outlet end corresponds to the port of the flow steel channel 43 in the tundish 4, and at the same time connect the corresponding compressed air to the upper end of the combustion-supporting tube 1, and select the corresponding combustion-supporting gas to be connected according to the needs. After preparation, ignite the corresponding roaster dropped above the cover 41 of the tundish 4, and start baking the tundish 4 through the roaster, then open the compressed air source and the fuel gas source, and adjust the gas source according to the type of gas connected and the needs. The pressure valve 6 adjusts the gas connected to the combustion-supporting tube 1 to a suitable ratio, and brings more gas and flame into the steel flow channel 43 of the tundish 4 through the combustion-supporting tube 1, so as to strengthen the baking of the steel flow channel 43. After the compressed air is blown, more gas enters the steel flow channel 43, and the gas in the steel flow channel 43 is more fully burned. During the baking process of the tundish 4, an infrared measuring temperature gun can be used to monitor the temperature of various parts inside and outside the tundish 4 at any time. When the temperature requirement is reached, the baking can be stopped, the combustion-supporting tube 1 and the baker can be removed, and continuous casting can be started later.

[0029] The utility model relates to a tundish baking device, in which compressed air is introduced into the steel flow channel 43, so that more oxygen and fuel gas enter the steel flow channel 43, so that the steel flow channel 43 is baked more evenly and effectively, and the baking temperature of the steel flow channel 43 is directly increased, and the problem of uneven temperature existing in the baking of the traditional tundish 4 is reduced, so that the temperature drop of the molten steel from the large ladle to the tundish 4 is significantly reduced. This method effectively improves the baking effect of the steel flow channel 43 of the tundish 4, improves the stability of the casting machine, significantly reduces the temperature drop of the molten steel in the tundish 4, reduces the upper steel temperature, and reduces the production cost of the refining process.

[0030] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A tundish baking device, characterized in that: It comprises a combustion-supporting pipe (1) corresponding to a steel flow channel (43) of a tundish (4), the inlet end of which is connected to a compressed air pipe (2), the combustion-supporting pipe (1) is connected to an external compressed air source through the compressed air pipe (2), a reserved opening (42) corresponding to the combustion-supporting pipe (1) is provided on a cover (41) of the tundish (4), the combustion-supporting pipe (1) passes through the reserved opening (42) and extends into the tundish (4), wherein the lower part is bent at an angle, and the outlet end of the combustion-supporting pipe (1) extends into the port of the steel flow channel (43) correspondingly.

2. The tundish baking device according to claim 1, characterized in that: A communicating gas pipe (3) is additionally provided at the inlet end of the combustion-supporting pipe (1); the gas pipe (3) and the compressed air pipe (2) are connected in parallel to the inlet end of the combustion-supporting pipe (1); and the combustion-supporting pipe (1) is externally connected to a corresponding combustion-supporting gas source via the gas pipe (3).

3. The tundish baking device according to claim 2, characterized in that: Each pipeline connected to the inlet end of the combustion-supporting pipe (1) is provided with a separate pressure regulating valve (6), including an air pressure regulating valve (61) provided on the compressed air pipe (2) and a gas pressure regulating valve (62) provided on the gas pipe (3).

4. The tundish baking device according to claim 1, characterized in that: The outlet end of the combustion-supporting pipe (1) is provided with a nozzle (5), and the two are detachably fixedly connected.

5. The tundish baking device according to claim 1, characterized in that: The combustion-supporting tube (1) is provided with a T-shaped fixing sleeve (7), which includes a T-shaped upper end crossbeam (71) and a vertical pipe sleeve (72). The pipe sleeve (72) is a hollow pipe body, and its upper end is connected to the lower surface of the crossbeam (71). The crossbeam (71) is provided with a sleeve hole (74) corresponding to the pipe sleeve (72). The combustion-supporting tube (1) passes through the middle inner cavity of the pipe sleeve (72), and its upper end passes through the top of the sleeve hole (74) of the crossbeam (71). The outer ring of the pipe sleeve (72) is provided with a corresponding locking ring (73).

6. The tundish baking device according to claim 5, characterized in that: A corresponding fixing device is provided below the fixing sleeve (7), and the combustion-supporting tube (1) is detachably fixed to the ladle cover (41) of the intermediate ladle (4) through the fixing device, and the fixing device comprises a fixing clamp (9) and a fuel tube clamp (8), wherein the fixing clamp (9) is clamped on the ladle cover, the fuel tube clamp (8) is fixedly connected to the fixing clamp (9), and the combustion-supporting tube (1) is clamped on the fuel tube clamp (8).

7. The tundish baking device according to claim 6, characterized in that: The fixing clamp (9) comprises an upper clamp (91) and a lower clamp (92), wherein the upper end of the upper clamp (91) is provided with an upper handle (911), and the lower end is provided with a lower clamp handle (913), and the two are connected to each other through a fixing rod (912) in the middle, and the ends of the two are respectively fixed to the upper and lower ends of the fixing rod (912), and the lower clamp (92) is provided between the upper handle (911) and the lower clamp handle (913), and the upper end of the lower clamp (92) is provided with a lower handle (921), and the lower end is provided with an upper clamp handle (923), and the two are connected to each other through a sliding rod (922) in the middle, and the ends of the two are respectively fixed to the upper and lower ends of the sliding rod (922), and the fixing rod (912) is provided with a hollow vertical slideway (93). A slide column (94) corresponding to the slideway (93) is provided on the side wall of the sliding rod (922), and the lower clamp (92) can slide up and down on the side of the fixed rod (912) through the slide column (94). The lower handle (921) is located below the upper handle (911), and a guide rod (95) is provided between the two and close to the fixed rod (912). The upper end of the guide rod (95) is fixedly connected to the lower surface of the upper handle (911), and a through hole (97) corresponding to the guide rod (95) is provided on the lower handle (921). The lower end of the guide rod (95) penetrates into the through hole (97), and a corresponding spring (96) is provided on the periphery of the guide rod (95). The fuel pipe clamp (8) is connected to the side wall of the fixed rod (912).

8. The tundish baking device according to claim 1, characterized in that: The combustion-supporting tube (1) is made of flexible stainless steel material, and the angle between the upper and lower sections after bending is not less than 90°. The surrounding area of ​​the cover (41) of the intermediate ladle (4) and the reserved opening (42) are both made of corresponding materials to prevent fire leakage. The pressure of the compressed air connected to the combustion-supporting tube (1) is 0.15-0.20MPa.

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