Gas maintaining device of iron-oxygen combustion molten pool

Abstract

The invention discloses a gas holding device of a molten iron oxygen combustion pool, the gas holding device is used for restraining the jetting range of a cleaning burner, the gas holding device comprises a jetting body, an outer cavity cylinder, a gas flow channel and a cooling mechanism, the jetting body, the outer cavity cylinder and the gas flow channel are arranged along the same central axis, the outer cavity cylinder is arranged on the jetting body and the cooling mechanism in a sleeving mode, and the gas flow channel is arranged in the outer cavity cylinder. One end of the cooling mechanism penetrates through the outer cavity cylinder, the cooling mechanism is provided with a spraying body, the diameter of an inner cavity line of the spraying body is reduced and then increased in the gas supply direction, and the Mach number of the spraying body is larger than that of an oxygen cleaning burner, so that a gas flow beam output by the spraying body forms a gas wall on the edge of a molten pool, and cleaning oxygen is prevented from dispersing outwards; the casting blank corner cleaning device is controlled within the casting blank corner cleaning range, the oxygen utilization rate is increased, the molten pool range is effectively restrained, the purpose that the corners are in an arc angle state after casting blank cleaning is achieved, the slag splashing direction is changed, and the oxidizing slag adhesion problem is solved.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, in particular to a gas retaining device for an iron-oxygen combustion molten pool. Background Art

[0002] The continuous casting billets cast by major steel mills are right-angled billets, and the defects at the right angles of the billets are the most serious. In order to improve the quality of billet products and avoid defects from being carried into the next process, steel mills usually choose to process the right angles of the billets into arc angles. Currently, there are two ways to process the corners, one is manual flame cleaning, and the other is mechanical corner flame cleaning.

[0003] Among them, manual flame cleaning has a low operation rate, unstable cleaning quality, and high skill requirements for cleaning personnel. Therefore, the manual handheld cleaning burner cleaning method on the market is gradually replaced by mechanical flame cleaning. However, the current corner flame cleaning method is to aim the cleaning burner at the corner of the billet and form an acute angle with the corner. The billet and the cleaning burner move relative to each other, and the cleaning burner will easily generate oxygen dispersion, resulting in low work efficiency, and will produce oxide slag during the processing process, thus affecting product quality. Summary of the invention

[0004] The object of the present invention is to provide a gas retaining device for an iron-oxygen combustion molten pool to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A gas retaining device for an iron-oxygen combustion molten pool, the gas retaining device is used to restrict the spray range of a cleaning burner, the gas retaining device comprises an outer cavity tube, a spray body, a cooling mechanism, and a gas flow channel, the spray body, the outer cavity tube and the gas flow channel are arranged along the same central axis, the outer cavity tube is sleeved on the spray body and the cooling mechanism, one end of the cooling mechanism passes through the outer cavity tube, the cooling mechanism is provided with a spray body, the diameter of the inner cavity line of the spray body first decreases and then increases along the gas supply direction, and the Mach number of the spray body is greater than the Mach number of the oxygen cleaning burner.

[0007] The ejector serves as the output end of the entire device, the gas flow channel serves as the input end of the entire device, the cooling mechanism is used to cool the entire device and reduce the impact of high temperature on the flowing gas, the outer cavity tube is used to connect with the cooling mechanism and wrap the gas flow channel, when the oxygen flow in the cleaning oxygen burner is sprayed onto the surface of the ingot, it will be broken up by the corners of the ingot, so that the oxygen concentration in the corner area is reduced, causing instability in the molten pool area; and the gas retaining device of the iron oxygen combustion molten pool is arranged on the side of the cleaning oxygen burner, and the flow beam of its gas jet constrains the spray range of the oxygen flow in the cleaning burner, and because the Mach number of the ejector is greater than the Mach number of the oxygen cleaning burner, the gas flow beam output by the ejector forms a "gas wall" at the edge of the molten pool to avoid the dispersion of the cleaning oxygen and control it within the cleaning range of the ingot corner, thereby improving the oxygen utilization rate, effectively constraining the molten pool range, and achieving the goal of the corner of the ingot to be in an arc angle state after cleaning, and changing the slag splashing direction to solve the problem of oxide slag adhesion.

[0008] The cooling mechanism includes a water inlet pipe, a water outlet pipe, and a water cooling seat. The water inlet pipe and the water outlet pipe are located in the outer cavity tube, the water inlet pipe and the water outlet pipe are located on both sides of the gas flow channel, the water cooling seat is located at one end of the outer cavity tube, the water cooling seat is threadedly connected to the outer cavity tube, the water inlet pipe is fixedly connected to the water cooling seat, and the water outlet pipe is fixedly connected to the water cooling seat.

[0009] The water inlet pipe and the water outlet pipe are located on both sides of the gas flow channel, and the water inlet pipe is connected with the outer cavity tube. The water-cooling liquid in the water inlet pipe will enter the outer cavity tube, so that the water-cooling liquid will maintain the temperature of the airflow in the gas flow channel and reduce the impact of high temperature on the gas flow rate. The water-cooling liquid will flow in the outer cavity tube, concentrate into the water cooling seat, and then be discharged through the water outlet pipe.

[0010] Two grooves are provided at the bottom end of the water cooling seat, and an annular groove is provided inside the water cooling seat. The grooves are connected to each other, one of the grooves is connected to the input end of the water outlet pipe, and the other groove is used for allowing water cooling liquid to enter. A through hole A is provided on the positive axis of the water cooling seat, one end of the through hole A is connected to the input end of the gas flow channel, and the other end of the through hole A is connected to the injection body.

[0011] One of the grooves is connected to the outer cavity tube, and the other groove is welded to the water outlet pipe, so that the water-cooling liquid in the water outlet pipe will first pass through the internal space of the outer cavity tube to cool the gas flow channel to prevent high temperature from affecting the gas flow rate. The water-cooling liquid then enters the water-cooling seat through the groove connected to the outer cavity tube, and then the water-cooling liquid passes through the annular groove and goes around the water-cooling seat into another groove, and is finally discharged through the water outlet pipe to form a cycle. The water-cooling liquid in the cooling mechanism as a whole directly contacts the gas flow channel. Compared with the pipeline water-cooling liquid, the existence time is longer, the contact surface is larger, and the cooling efficiency is higher.

[0012] A fastener is provided at the bottom end of the ejector body, a through groove is opened on the positive axis of the fastener, the through groove cooperates with the ejector body, a thread A is provided on the fastener, a thread B is provided on the water cooling seat, thread B cooperates with thread A, a bottom plate is provided at the bottom end of the outer cavity tube, a through hole B is opened on the bottom plate, and the bottom plate is fixedly connected to the outer cavity tube.

[0013] The fasteners are used to install the ejector on the water cooling seat. The fasteners are connected to the water cooling seat through threads. The bottom plate is used to seal the inner space of the outer cavity to prevent the water cooling liquid from leaking out. The through hole B in the bottom plate is used to cooperate with the gas flow channel, water inlet pipe and water outlet pipe.

[0014] Through holes C are provided on both sides of the through hole B, and the through holes B cooperate with the gas flow channel. One of the through holes C is fixedly connected to the water inlet pipe, and the other through hole C cooperates with the water outlet pipe.

[0015] The through hole B is connected with the water outlet pipe, so that the water-cooling liquid of the water outlet pipe will enter the internal space of the outer cavity tube. Then, because the water inlet pipe cooperates with the through hole B, the gas flow channel cooperates with the through hole B, and the water cooling seat is connected with the top of the outer cavity tube, the internal space of the outer cavity tube will form a closed space, and the water-cooling liquid will not leak out.

[0016] A main hole is opened on the positive axis of the injection body, and auxiliary air holes are opened on the periphery of the main hole. The angle between the axis direction of the auxiliary air hole and the central axis ranges from 1.5° to 3°.

[0017] The main hole is used as the output pipe of the main hole of the injection body, and the main hole and the axis of the injection body are on the same axis, and then the auxiliary air hole is used to assist the output of the main hole.

[0018] A detection mechanism is provided on the gas flow channel, which includes an impeller and a shell. The impeller is located in the gas flow channel, the shell is located at the input end of the gas flow channel, a rotating motor is provided on the shell, a rotating rod is provided inside the shell, the output end of the rotating motor is fixedly connected to the rotating rod, the rotating rod is provided with blades, and the blades are fixedly connected to the rotating rod.

[0019] The impeller in the detection mechanism is used to detect the gas flow rate inside the gas flow channel. The gas will produce losses during the flow process, which will lead to the inconsistency between the initial gas Mach number and the terminal gas Mach number, affecting the gas retention device. The final output Mach number is inconsistent with the expected, resulting in the failure to achieve the purpose of restricting the injection range of the cleaning burner. After the gas passes through the impeller, it will drive the impeller to rotate, and the gas flow rate is obtained by the impeller rotation speed. The rotating motor is used as the output end to control the rotation of the rotating rod. Because the rotating rod is fixedly connected to the blades, the rotation of the rotating rod will drive the blades to rotate. Because the blades are located in the shell, the shell is connected to the gas flow channel. The rotation of the blades is controlled by the rotating motor to control the gas flow rate inside the gas flow channel. During the working process, the gas flow rate is obtained by the impeller rotation speed, thereby controlling the operation of the rotating motor to make the gas flow rate inside the gas flow channel reach the expected Mach number.

[0020] The input end of the water inlet pipe is provided with a connector, the input end of the gas flow channel is provided with a connector, and the output end of the water outlet pipe is provided with a connector.

[0021] The connecting piece is used to connect with the corresponding external pipeline.

[0022] Gas flow channel in gas retaining device is used to convey inert gas

[0023] The inert gas in the gas flow channel will not participate in the iron-oxygen reaction.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0025] (1) The present invention is the core device of the equipment for cleaning the corners of ingots, and plays a decisive role in the stability of the molten pool. The gas flow channel thereof will be output through the ejector, so that when the cleaning burner is cleaning the corners of the ingot with flame, a "gas wall" is formed at the edge of the molten pool through the flow beam of the gas jet, so as to avoid the dispersion of cleaning oxygen and control it within the cleaning range of the corners of the ingot, thereby improving the oxygen utilization rate, thereby effectively constraining the range of the molten pool, achieving the goal of making the corners of the ingot in an arc angle state after cleaning, and changing the direction of slag splashing, thereby solving the problem of oxide slag adhesion. The gas in the gas flow channel in the gas retaining device adopts inert gas, and the inert gas will not participate in the iron-oxygen reaction.

[0026] (2) The present invention has its own water cooling system, which can improve the life of the device and enable it to work continuously for a long time. The water inlet pipe in the cooling mechanism will input the water-cooling liquid into the outer cavity tube, so that the water-cooling liquid will maintain the temperature of the airflow in the gas flow channel and reduce the impact of high temperature on the gas flow rate. The water-cooling liquid will flow in the outer cavity tube and enter the water-cooling seat in a concentrated manner. The water-cooling liquid will pass through the annular groove and circle around the water-cooling seat once before entering another groove, and finally be discharged through the water outlet pipe to form a cycle. The water-cooling liquid in the cooling mechanism as a whole directly contacts the gas flow channel. Compared with the pipeline water-cooling liquid, the existence time is longer, the contact surface is larger, and the cooling efficiency is higher.

[0027] (3) In the detection mechanism of the present invention, the gas flow rate is obtained by the rotation speed of the impeller. The rotating motor serves as the output end to control the rotation of the rotating rod. Since the rotating rod is fixedly connected to the blades, the rotation of the rotating rod will drive the blades to rotate. Since the blades are located in the shell, the shell is connected to the gas flow channel. The rotation of the blades is controlled by the rotating motor to control the rotation of the blades to achieve the control of the gas flow rate inside the gas flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the overall side structure of the present invention;

[0031] Figure 3 It is a schematic diagram of the overall internal structure of the present invention;

[0032] Figure 4 It is a schematic diagram of the ejector structure of the present invention;

[0033] Figure 5 It is a schematic diagram of the structure of the internal detection mechanism of the gas flow channel of the present invention;

[0034] Figure 6 It is a schematic diagram of the housing structure of the detection mechanism of the present invention;

[0035] Figure 7 It is a schematic diagram of the structure of the outer cavity tube of the present invention;

[0036] Figure 8 It is a schematic diagram of the structure of the bottom end of the outer cavity tube of the present invention;

[0037] Fig. 9 It is a schematic diagram of the bottom structure of the water cooling seat of the present invention;

[0038] Fig.10 It is a schematic diagram of the top structure of the water cooling seat of the present invention;

[0039] Fig.11 It is a schematic diagram of the fastener structure of the present invention.

[0040] In the figure: 1. outer cavity tube; 2. injection body; 21. main hole; 22. auxiliary air hole; 3. cooling mechanism; 31. water inlet pipe; 32. water outlet pipe; 33. water cooling seat; 331. groove; 332. annular groove; 333. through hole A; 334. thread B; 4. gas flow channel; 5. fastener; 51. through groove; 52. thread A; 6. bottom plate; 61. through hole B; 62. through hole C; 7. detection mechanism; 71. impeller; 72. housing; 73. rotating motor; 74. rotating rod; 75. blade; 8. connecting piece. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0042] The present invention provides a technical solution:

[0043] like Figures 1 to 11 As shown, a gas retaining device for an iron-oxygen combustion molten pool is used to restrict the spray range of a cleaning burner. The gas retaining device comprises an outer cavity tube 1, a spray body 2, a cooling mechanism 3, and a gas flow channel 4. The outer cavity tube 1, the spray body 2, and the gas flow channel 4 are arranged along the same central axis. The outer cavity tube 1 is sleeved on the spray body 2 and the cooling mechanism 3. One end of the cooling mechanism 3 passes through the outer cavity tube 1. The cooling mechanism 3 is provided with the spray body 2. The diameter of the inner cavity line of the spray body 2 first decreases and then increases along the gas supply direction. The Mach number of the spray body 2 is greater than the Mach number of the oxygen cleaning burner.

[0044] Specifically, the ejector 2 serves as the output end of the entire device, the gas flow channel 4 serves as the input end of the entire device, the cooling mechanism 3 is used to cool the entire device to reduce the impact of high temperature on the flowing gas, the outer cavity tube 1 is used to connect with the cooling mechanism 3 and wrap the gas flow channel 4, when the oxygen flow in the cleaning oxygen burner is sprayed onto the surface of the ingot, it will be broken up by the corners of the ingot, so that the oxygen concentration in the corner area is reduced, causing instability in the molten pool area; and the gas retaining device for the iron oxygen combustion molten pool is arranged on the side of the cleaning oxygen burner, and the flow beam of its gas jet constrains the spray range of the oxygen flow in the cleaning burner, and because the Mach number of the ejector 2 is greater than the Mach number of the oxygen cleaning burner, the gas flow beam output by the ejector 2 forms a "gas wall" at the edge of the molten pool to avoid the dispersion of the cleaning oxygen and control it within the cleaning range of the ingot corner, thereby improving the oxygen utilization rate, effectively constraining the molten pool range, and achieving the goal of the corner of the ingot to be in an arc angle state after cleaning, and changing the slag splashing direction to solve the problem of oxide slag adhesion.

[0045] like Figure 1 to Figure 3 , Fig. 9 , Fig.10 As shown, the cooling mechanism 3 includes a water inlet pipe 31, a water outlet pipe 32, and a water cooling seat 33. The water inlet pipe 31 and the water outlet pipe 32 are located in the outer cavity tube 1, and the water inlet pipe 31 and the water outlet pipe 32 are located on both sides of the gas flow channel 4. The water cooling seat 33 is located at one end of the outer cavity tube 1, and the water cooling seat 33 is threadedly connected to the outer cavity tube 1. The water inlet pipe 31 is fixedly connected to the water cooling seat 33, and the water outlet pipe 32 is fixedly connected to the water cooling seat 33;

[0046] Specifically, the water inlet pipe 31 and the water outlet pipe 32 are located on both sides of the gas flow channel 4, and the water inlet pipe 31 is connected to the outer cavity tube 1, wherein the water-cooling liquid of the water inlet pipe 31 will enter the outer cavity tube 1, so that the water-cooling liquid will maintain the temperature of the airflow in the gas flow channel 4, reducing the impact of high temperature on the gas flow rate, and the water-cooling liquid will flow in the outer cavity tube 1, and concentrate into the water cooling seat 33, and then be discharged through the water outlet pipe 32.

[0047] like Figures 1 to 11 , Fig. 9 , Fig.10As shown, two grooves 331 are provided at the bottom of the water cooling seat 33, and an annular groove 332 is provided in the water cooling seat 33. The grooves 331 are connected to the annular grooves 332, one of the grooves 331 is connected to the input end of the water outlet pipe 32, and the other groove 331 is used for the water cooling liquid to enter. A through hole A333 is provided on the positive axis of the water cooling seat 33, one end of the through hole A333 is connected to the input end of the gas flow channel 4, and the other end of the through hole A333 is connected to the ejector 2;

[0048] Specifically, one of the grooves 331 is connected to the outer cavity tube 1, and the other groove 331 is welded to the water outlet pipe 32, so that the water-cooling liquid in the water outlet pipe 32 will first pass through the internal space of the outer cavity tube 1 to cool the gas flow channel 4 to prevent high temperature from affecting the gas flow rate, and then the water-cooling liquid will enter the water-cooling seat 33 through the groove 331 connected to the outer cavity tube 1, and then the water-cooling liquid will pass through the annular groove 332 and enter another groove 331 after circling the water-cooling seat 33, and finally be discharged through the water outlet pipe 32 to form a cycle. The water-cooling liquid in the cooling mechanism 3 as a whole directly contacts the gas flow channel 4. Compared with the pipeline water-cooling liquid, the existence time is longer, the contact surface is larger, and the cooling efficiency is higher.

[0049] like Figure 1 to Figure 3 , Figure 8 , Fig.10 , Fig.11 As shown, a fastener 5 is provided at the bottom end of the ejection body 2, a through groove 51 is provided on the positive axis of the fastener 5, the through groove 51 cooperates with the ejection body 2, a thread A52 is provided on the fastener 5, a thread B334 is provided on the water cooling seat 33, the thread B334 cooperates with the thread A52, a bottom plate 6 is provided at the bottom end of the outer cavity tube 1, a through hole B61 is provided on the bottom plate 6, and the bottom plate 6 is fixedly connected to the outer cavity tube 1;

[0050] Specifically, the fastener 5 is used to install the injection body 2 on the water cooling seat 33. The fastener 5 is connected to the water cooling seat 33 through threads. Then the bottom plate 6 is used to seal the internal space of the outer cavity tube 1 to prevent the water-cooling liquid from leaking out. The through hole B61 in the bottom plate 6 is used to cooperate with the gas flow channel 4, the water inlet pipe 31, and the water outlet pipe 32.

[0051] like Figure 8 As shown, through holes C are opened on both sides of the through hole B61, and the through hole B61 cooperates with the gas flow channel 4, one of the through holes C62 is fixedly connected to the water inlet pipe 31, and the other through hole C62 cooperates with the water outlet pipe 32.

[0052] Specifically, the through hole C62 is connected with the water outlet pipe 32, so that the water-cooling liquid of the water outlet pipe 32 will enter the internal space of the outer cavity tube 1, and then because the water inlet pipe 31 cooperates with the through hole C62, the gas flow channel 4 cooperates with the through hole B61, and the water-cooling seat 33 is connected with the top of the outer cavity tube 1, so that the internal space of the outer cavity tube 1 will form a closed space, and the water-cooling liquid will not leak out.

[0053] like Figure 3 , Figure 4 As shown, the main hole 21 is opened on the positive axis of the injection body 2, and auxiliary air holes 22 are opened on the periphery of the main hole 21. The angle between the axis direction of the auxiliary air hole 22 and the central axis ranges from 1.5° to 3°.

[0054] Specifically, the main hole 21 serves as an output pipe of the main hole 21 of the injection body 2 , and the main hole 21 and the axis of the injection body 2 are coaxial, and then the auxiliary air hole 22 is used to assist the main hole 21 in outputting.

[0055] like Figure 5 , Figure 6 As shown, a detection mechanism 7 is provided on the gas flow channel 4, and the detection mechanism 7 includes an impeller 71 and a housing 72. The impeller 71 is located in the gas flow channel 4, and the housing 72 is located at the input end of the gas flow channel 4. A rotating motor 73 is provided on the housing 72, and a rotating rod 74 is provided inside the housing 72. The output end of the rotating motor 73 is fixedly connected to the rotating rod 74, and a blade 75 is provided on the rotating rod 74, and the blade 75 is fixedly connected to the rotating rod 74;

[0056] Specifically, the impeller 71 in the detection mechanism 7 is used to detect the gas flow rate inside the gas flow channel 4. The gas will produce losses during the flow process, which will cause the initial gas Mach number to be inconsistent with the terminal gas Mach number, affecting the final output of the gas retention device to prevent the Mach number from being inconsistent with the expected, resulting in the purpose of not restraining the injection range of the cleaning burner. After the gas passes through the impeller 71, it will drive the impeller 71 to rotate, and the gas flow rate is obtained by the rotation speed of the impeller 71. The rotating motor 73 serves as the output end to control the rotation of the rotating rod 74. Since the rotating rod 74 is fixedly connected to the blade 75, the rotation of the rotating rod 74 will drive the blade 75 to rotate. Since the blade 75 is located in the shell 72, the shell 72 is connected to the gas flow channel 4. The rotation of the blade 75 is controlled by the rotating motor 73 to control the gas flow rate inside the gas flow channel 4. During the working process, the gas flow rate is obtained by the rotation speed of the impeller 71, thereby controlling the operation of the rotating motor 73 so that the gas flow rate inside the gas flow channel 4 reaches the expected Mach number.

[0057] like Figure 1 to Figure 3 , Figure 5 , Figure 6 As shown, the input end of the water inlet pipe 31 is provided with a connector 8, the input end of the gas flow channel 4 is provided with a connector 8, and the output end of the water outlet pipe 32 is provided with a connector 8;

[0058] Specifically, the connecting piece 8 is used to connect with a corresponding external pipeline.

[0059] like Figure 1 to Figure 3 , Figure 5 , Figure 6 As shown, the gas flow channel 4 in the gas retaining device is used to transport the inert gas;

[0060] Specifically, the inert gas in the gas flow channel 4 will not participate in the iron-oxygen reaction.

[0061] Working principle of the present invention: The present invention is used to cooperate with the cleaning burner, and its gas flow channel 4 will be output through the ejector 2, so that when the cleaning burner performs flame cleaning on the corner of the ingot, a "gas wall" is formed at the edge of the molten pool through the flow beam of the gas jet, so as to avoid the dispersion of cleaning oxygen and control it within the cleaning range of the corner of the ingot, thereby improving the oxygen utilization rate, thereby effectively constraining the molten pool range, achieving the goal of the corner of the ingot to be in an arc angle state after cleaning, and changing the direction of slag splashing, solving the problem of oxide slag adhesion. During this process, the water inlet pipe 31 in the cooling mechanism 3 will input water-cooling liquid into the outer cavity tube 1, so that the water-cooling liquid will maintain the temperature of the airflow in the gas flow channel 4, reduce the influence of high temperature on the gas flow rate, and the water-cooling liquid will flow in the outer cavity tube 1 and enter the water cooling seat in a concentrated manner. 33, the water-cooling liquid will pass through the annular groove 332 and then go around the water-cooling seat 33 for a circle into another groove 331, and finally be discharged through the water outlet pipe 32 to form a cycle. The water-cooling liquid in the cooling mechanism 3 as a whole is in direct contact with the gas flow channel 4. Compared with the pipeline water-cooling liquid, it exists longer, has a larger contact surface, and has a higher cooling efficiency. In this process, the gas flow rate is obtained by the rotation speed of the impeller 71 in the detection mechanism 7, and the rotating motor 73 is used as the output end to control the rotation of the rotating rod 74. Because the rotating rod 74 is fixedly connected to the blade 75, the rotating rod 74 will drive the blade 75 to rotate when it rotates. Because the blade 75 is located in the shell 72, the shell 72 is connected to the gas flow channel 4, and the rotation of the blade 75 is controlled by the rotating motor 73 to control the gas flow rate inside the gas flow channel 4.

[0062] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0063] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas retaining device for an iron-oxygen combustion molten pool, the gas retaining device being used to restrict the spray range of a cleaning burner, characterized in that: The gas retaining device comprises an outer cavity tube (1), a jet (2), a cooling mechanism (3), and a gas flow channel (4); the outer cavity tube (1), the jet (2), and the gas flow channel (4) are arranged along the same central axis; the outer cavity tube (1) is sleeved on the jet (2) and the cooling mechanism (3); one end of the cooling mechanism (3) passes through the outer cavity tube (1); the cooling mechanism (3) is provided with a jet (2); the diameter of the inner cavity line of the jet (2) first decreases and then increases along the gas supply direction; the Mach number of the jet (2) is greater than the Mach number of the oxygen cleaning burner.

2. The gas retaining device for an iron-oxygen combustion molten pool according to claim 1, characterized in that: The cooling mechanism (3) comprises a water inlet pipe (31), a water outlet pipe (32), and a water cooling seat (33); the water inlet pipe (31) and the water outlet pipe (32) are located in the outer cavity tube (1); the water inlet pipe (31) and the water outlet pipe (32) are located on both sides of the gas flow channel (4); the water cooling seat (33) is located at one end of the outer cavity tube (1); the water cooling seat (33) is threadedly connected to the outer cavity tube (1); the water inlet pipe (31) and the water cooling seat (33) are fixedly connected; and the water outlet pipe (32) and the water cooling seat (33) are fixedly connected.

3. The gas retaining device for an iron-oxygen combustion molten pool according to claim 2, characterized in that: Two grooves (331) are provided at the bottom end of the water cooling seat (33), an annular groove (332) is provided in the water cooling seat (33), the grooves (331) are connected to the annular grooves (332), one of the grooves (331) is connected to the input end of the water outlet pipe (32), and the other groove (331) is used to allow water cooling liquid to enter, a through hole A (333) is provided on the positive axis of the water cooling seat (33), one end of the through hole A (333) is connected to the input end of the gas flow channel (4), and the other end of the through hole A (333) is connected to the injection body (2).

4. A gas retaining device for an iron-oxygen combustion molten pool according to claim 3, characterized in that: A fastener (5) is provided at the bottom end of the ejector body (2), a through groove (51) is provided on the axis of the fastener (5), the through groove (51) matches with the ejector body (2), a thread A (52) is provided on the fastener (5), a thread B (334) is provided on the water cooling seat (33), the thread B (334) matches with the thread A (52), a bottom plate (6) is provided at the bottom end of the outer cavity tube (1), a through hole B (61) is provided on the bottom plate (6), and the bottom plate (6) is fixedly connected to the outer cavity tube (1).

5. A gas retaining device for an iron-oxygen combustion molten pool according to claim 4, characterized in that: Through holes C are provided on both sides of the through hole B (61), and the through hole B (61) cooperates with the gas flow channel (4), one of the through holes C (62) is fixedly connected to the water inlet pipe (31), and the other through hole C (62) cooperates with the water outlet pipe (32).

6. A gas retaining device for an iron-oxygen combustion molten pool according to claim 5, characterized in that: The jet body (2) has a main hole (21) formed on its axis, and an auxiliary air hole (22) formed on the periphery of the main hole (21). The angle between the axis direction of the auxiliary air hole (22) and the central axis is in the range of 1.5° to 3°.

7. A gas retaining device for an iron-oxygen combustion bath according to claim 6, characterized in that: The gas flow channel (4) is provided with a detection mechanism (7), the detection mechanism (7) comprising an impeller (71) and a housing (72), the impeller (71) being located in the gas flow channel (4), the housing (72) being located at the input end of the gas flow channel (4), the housing (72) being provided with a rotating motor (73), a rotating rod (74) being provided inside the housing (72), the output end of the rotating motor (73) being fixedly connected to the rotating rod (74), the rotating rod (74) being provided with blades (75), and the blades (75) being fixedly connected to the rotating rod (74).

8. The gas retaining device for an iron-oxygen combustion molten pool according to claim 7, characterized in that: The input end of the water inlet pipe (31) is provided with a connector (8), the input end of the gas flow channel (4) is provided with a connector (8), and the output end of the water outlet pipe (32) is provided with a connector (8).

9. A gas retaining device for an iron-oxygen combustion molten pool according to claim 8, characterized in that: The gas flow channel (4) in the gas retaining device is used for conveying inert gas.

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