Oxygen blowing tuyere of smelting reduction ironmaking furnace

Abstract

The invention discloses an oxygen blowing tuyere of a smelting reduction ironmaking furnace, and relates to the technical field of reduction ironmaking. A connecting pipe is slidably inserted into a fixing cylinder, a high-temperature-resistant floating plate is mounted at the joint of the connecting pipe and an oxygen blowing head, and the high-temperature-resistant floating plate floats on scum in a furnace body, so that when the position of the liquid level of molten iron in the furnace body is changed, the oxygen blowing tuyere can blow oxygen into the furnace body; the position of the oxygen blowing head can be synchronously adjusted, so that the oxygen blowing head and molten iron in the furnace body are always in a relatively stable position relationship, the situation that the oxygen blowing head is inserted too deep due to the increase of the molten iron in the furnace body is avoided, and the stability during smelting reduction ironmaking is improved to a certain extent; the first spraying hole, the second spraying hole and the third spraying hole are formed to spray airflow at the end of the oxygen blowing head, so that isolated airflow can be formed at the end of the oxygen blowing head, combustible gas is prevented from flowing to the end of the oxygen blowing head to cause deflagration, and the service life of the oxygen blowing head is prolonged.

Description

Technical Field

[0001] The invention relates to the field of reduction ironmaking, and in particular to an oxygen blowing tuyere of a molten reduction ironmaking furnace. Background Art

[0002] The smelting reduction ironmaking furnace is a non-blast furnace ironmaking equipment based on the smelting reduction ironmaking method. It can overcome the shortcomings of traditional blast furnace ironmaking, such as large investment, high energy consumption, long process and serious pollution. During ironmaking production, coal is loaded into the melting gasification furnace, and then high-purity oxygen is blown into the coal to burn and decompose it. The generated coal gas is used as reducing coal gas to reduce the lump ore and ore particles in the furnace and smelt them into molten iron.

[0003] During the oxygen blowing process, high-purity oxygen is blown into the furnace body through the oxygen blowing tuyere. Under normal circumstances, the position of the oxygen blowing tuyere remains fixed, which makes the position where oxygen enters the furnace through the oxygen blowing tuyere fixed. When the raw materials in the furnace body are reduced and melted, causing the liquid level of the molten iron to gradually rise, the molten iron will gradually submerge the oxygen blowing tuyere. Under relative movement, the depth of the oxygen blowing tuyere inserted into the molten iron is too large, which will not only cause the oxygen to rush directly to the bottom of the furnace and destroy the furnace lining, but also cause the molten iron in the furnace body to splash violently, affecting the stability of reduction ironmaking.

[0004] Therefore, an oxygen blowing tuyere for a smelting reduction ironmaking furnace is proposed to solve some problems existing in the above-mentioned prior art. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the position of the oxygen tuyere for reduction ironmaking in the prior art cannot be automatically adjusted according to the increase or decrease of molten iron in the furnace body, resulting in the oxygen tuyere being inserted too deeply into the molten iron in the later stage of molten reduction ironmaking, affecting the stability of reduction ironmaking, and an oxygen tuyere for a molten reduction ironmaking furnace is proposed.

[0006] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0007] An oxygen blowing tuyere for a molten reduction ironmaking furnace comprises a furnace body, on the end wall of which a plurality of oxygen blowing assemblies arranged in a surrounding manner are installed, the oxygen blowing assemblies comprising a fixed cylinder fixedly inserted into the end wall of the furnace body, and the lower end of the fixed cylinder is inclinedly arranged toward the central axis of the furnace body, a connecting pipe is slidably inserted in the fixed cylinder, and the lower end of the connecting pipe is located inside the furnace body, a bending structure is arranged on the connecting pipe near its lower end, an oxygen blowing head is installed at the lower end of the connecting pipe, and an oxygen blowing flow channel connected to the connecting pipe is opened on the central axis of the oxygen blowing head, the oxygen blowing flow channel points to the central position inside the furnace body, and a high temperature resistant floating plate is installed at the connection between the connecting pipe and the oxygen blowing head.

[0008] Preferably, a limit block is fixedly mounted on the outer end wall of the connecting tube, a slide groove matched with the limit block is provided on the inner end wall of the fixing cylinder, and the slide groove is arranged parallel to the connecting tube.

[0009] Preferably, a plurality of oxygen blowing assemblies are evenly distributed on the end wall of the furnace body, at least three oxygen blowing assemblies are provided, and the number of the oxygen blowing assemblies is set to an odd number.

[0010] Preferably, a collar is rotatably sleeved on the connecting pipe and is arranged between the curved structure and the oxygen blowing head, and the collar is fastened to the connecting pipe by bolts, a vertically arranged sliding rod is fixedly mounted on the collar, and a high temperature resistant floating plate is slidably sleeved on the outer side of the sliding rod, and the high temperature resistant floating plate is fastened to the sliding rod by bolts.

[0011] Preferably, a recess connected to the outside of the oxygen blowing channel port is formed at one end of the oxygen blowing head away from the connecting pipe, and a plurality of first spray holes arranged around the oxygen blowing channel are formed on the annular surface in the recess, and the first spray holes are arranged parallel to the oxygen blowing channel. A plurality of second spray holes arranged around the oxygen blowing channel are formed on the cylindrical surface in the recess, and the second spray holes are inclined toward the central axis of the oxygen blowing channel. A plurality of third spray holes distributed around the outside of the recess are formed at one end of the oxygen blowing head away from the connecting pipe, and the third spray holes are inclined toward the direction away from the central axis of the oxygen blowing channel.

[0012] Preferably, an airflow switching mechanism is provided in the oxygen blowing head, and the airflow switching mechanism includes an annular cavity arranged around the outside of the oxygen blowing flow channel, and a first interface, a second interface and a third interface are sequentially provided on the end wall of the annular cavity close to the oxygen blowing flow channel, the first interface is connected to the first spray hole, the second interface is connected to the second spray hole, and the third interface is connected to the third spray hole, an airflow cavity is provided on the outside of the annular cavity, and a fourth interface is connected between the airflow cavity and the annular cavity, a ring block is slidably installed in the annular cavity, a spring is fixedly connected between the inner end wall of the annular cavity and the ring block, a fifth interface is provided on the end wall of the ring block close to the first interface, the second interface and the third interface, a sixth interface connected to the fifth interface is provided on the end wall of the ring block close to the fourth interface, and a first airflow channel connected to the annular cavity and a second airflow channel connected to the airflow cavity are provided in the end wall of the connecting pipe.

[0013] Preferably, a cooling water cavity is provided in the oxygen blowing head, and a water inlet and a water return channel connected to the cooling water cavity are provided in the end wall of the connecting pipe. The water inlet and the water return channel are staggered in the end wall of the connecting pipe in a double helical structure.

[0014] Preferably, the outer side of the lower end of the connecting pipe is equipped with an external thread, the oxygen blowing head is threadedly screwed on the lower end of the connecting pipe, and a first docking tube docking with the first air flow channel, a second docking tube docking with the second air flow channel, and a docking port docking with the water inlet channel and the water return channel are provided in the oxygen blowing head. The first docking tube is connected to the annular cavity, the second docking tube is connected to the air flow cavity, and the docking port is connected to the cooling water cavity.

[0015] Preferably, the upper end of the fixed cylinder is fixedly connected to a sleeve movably mounted on the outside of the connecting tube, and the upper end of the sleeve is bent and fixedly connected to the inside of the furnace body, and an oxygen supply pipe movably inserted in the connecting tube is fixedly installed in the sleeve, and the upper end of the oxygen supply pipe extends to the outside of the sleeve.

[0016] Preferably, four circumferentially distributed pipe joints are fixedly mounted on the lower outer end wall of the sleeve, and four circumferentially distributed through grooves are opened on the upper outer end wall of the connecting pipe. The four through grooves are arranged parallel to the connecting pipe and correspond one-to-one to the four pipe joints. The four through grooves are respectively connected to the first air flow channel, the second air flow channel, the water inlet channel and the water return channel.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, the connecting pipe is slidably inserted into the fixed cylinder, and the high temperature resistant floating plate is installed at the connection between the connecting pipe and the oxygen blowing head. With the help of the high temperature resistant floating plate floating on the slag in the furnace body, when the position of the molten iron liquid level in the furnace body changes, the position of the oxygen blowing head can be adjusted synchronously, so that the oxygen blowing head and the molten iron in the furnace body are always in a relatively stable position relationship, which is conducive to preventing the oxygen blowing head from being inserted too deeply due to the increase of molten iron in the furnace body, and to a certain extent improves the stability during smelting reduction ironmaking;

[0019] 2. In the present invention, by evenly and circumferentially installing at least three oxygen blowing assemblies on the end wall of the furnace body, oxygen blowing operation can be evenly and stably performed from multiple directions toward the center of the furnace body. At the same time, by setting the number of oxygen blowing assemblies to an odd number, there is only one oxygen blowing assembly on the same straight line, which can avoid the oxygen flow collision in the furnace body due to the symmetrical arrangement of the two oxygen blowing assemblies, which is beneficial to further improve the stability of oxygen blowing during reduction ironmaking;

[0020] 3. In the present invention, the sleeve ring is rotatably sleeved on the lower end of the connecting pipe, and the high temperature resistant floating plate is slidably sleeved on the vertically arranged sliding rod, and fastened by bolts, so that the height difference between the high temperature resistant floating plate and the oxygen blowing head can be adjusted in advance, so that the device can flexibly preset the position of the oxygen blowing head according to the actual situation during production, and control the depth of the oxygen blowing head inserted into the molten iron, which improves the flexibility of the device during use to a certain extent;

[0021] 4. In the present invention, by providing the first spray hole, the second spray hole and the third spray hole at the end of the oxygen blowing head to spray the airflow, an isolated airflow can be formed at the end of the oxygen blowing head to prevent the combustible gas from flowing to the end of the oxygen blowing head and deflagration with high-concentration oxygen, resulting in the burning of the oxygen blowing head, which is beneficial to prolonging the service life of the oxygen blowing head;

[0022] 5. In the present invention, the air flow wall formed by blowing out from the first spray hole presents a straight cylindrical structure, so that the oxygen sprayed from the oxygen blowing channel can be directly ejected over a long distance, which is convenient for concentrated oxygen blowing to the center of the furnace body. The air flow wall formed by blowing out from the second spray hole forms a round cover structure, and the port of the oxygen blowing channel is blocked to prevent the air flow and dust in the furnace body from entering the oxygen blowing channel. The air flow wall formed by blowing out from the third spray hole presents a trumpet-shaped structure, so that the oxygen sprayed from the oxygen blowing channel can diffuse outward, which is convenient for comprehensive dispersed oxygen blowing into the furnace body.

[0023] 6. In the present invention, by providing an airflow switching mechanism, the airflow supply states in the first nozzle hole, the second nozzle hole and the third nozzle hole can be flexibly switched, and the airflow switching mechanism is integrated in the oxygen blowing head, so that the first nozzle hole, the second nozzle hole and the third nozzle hole can share a larger diameter airflow channel, and use a smaller diameter airflow channel to control the airflow switching mechanism, which can avoid opening more large diameter airflow channels in the end wall of the connecting pipe, which is conducive to controlling the rationality of the thickness of the connecting pipe and facilitating the stability and flexibility of the device during actual operation;

[0024] 7. In the present invention, by opening a cooling water chamber in the oxygen blowing head and forming a continuous flow of cooling water in the cooling water chamber by means of a water inlet and a water return channel, it is beneficial to control the temperature of the oxygen blowing head and reduce the probability of the oxygen blowing head being burned during use. At the same time, by staggering the water inlet and the water return channel in a double helical structure in the end wall of the connecting pipe, the temperature of the connecting pipe can also be controlled during the flow of cooling water, which is beneficial to prolonging the service life of the device;

[0025] 8. In the present invention, by arranging the sleeve on the outer side of the upper end of the connecting pipe and connecting it with the interior of the furnace body, the air pressure strength at the upper end of the connecting pipe is consistent with the air pressure strength at the lower end of the connecting pipe, which can avoid the high temperature resistant floating plate driving the connecting pipe to move up and down and be affected by the internal and external pressure difference, which is beneficial to ensure the stability of the device during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 It is a front cross-sectional view of the present invention;

[0028] Figure 2 For the present invention Figure 1 The enlarged view of point A in the middle;

[0029] Figure 3 For the present invention Figure 1 The enlarged view of point B in the middle;

[0030] Figure 4 A perspective view of the present invention;

[0031] Figure 5 It is a top cross-sectional view of the present invention;

[0032] Figure 6 is a three-dimensional diagram of the oxygen blowing assembly of the present invention;

[0033] Figure 7 This is a disassembled view of the fixing tube and the connecting tube from the front view of the present invention;

[0034] Figure 8 This is a disassembled view of the fixing tube and the connecting tube from the back side of the present invention;

[0035] Fig. 9 It is a front view of the oxygen blowing assembly of the present invention;

[0036] Fig.10 For the present invention Fig. 9 Sectional view at CC;

[0037] Fig.11 For the present invention Fig. 9 Sectional view at DD in the middle;

[0038] Fig.12 A three-dimensional diagram of the lower end of the connecting pipe of the present invention;

[0039] Fig.13 A three-dimensional diagram of the oxygen blowing head of the present invention away from one end of the connecting pipe;

[0040] Fig.14 A three-dimensional diagram of the oxygen blowing head of the present invention near one end of the connecting pipe;

[0041] Fig.15 It is a cutaway view of the oxygen blowing head of the present invention.

[0042] Serial number in the picture:

[0043] 1. Furnace body;

[0044] 2. Fixed cylinder; 201. Connecting pipe; 202. Bending structure; 203. Limiting block; 204. First air flow channel; 205. Second air flow channel; 206. Water inlet channel; 207. Water return channel;

[0045] 3. Oxygen blowing head; 301. Oxygen blowing channel; 302. Notch; 303. First spray hole; 304. Second spray hole; 305. Third spray hole;

[0046] 4. Ring cavity; 401. First interface; 402. Second interface; 403. Third interface; 404. Air flow cavity; 405. Fourth interface; 406. Ring block; 407. Spring; 408. Fifth interface; 409. Sixth interface;

[0047] 5. High temperature resistant floating plate; 501. Ring; 502. Sliding rod;

[0048] 6. Cooling water chamber;

[0049] 7. First butt joint; 701. Second butt joint; 702. Butt joint;

[0050] 8. Casing; 801. Oxygen supply pipe; 802. Pipe joint; 803. Through groove. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0052] Embodiment: This embodiment provides an oxygen blowing tuyere for a smelting reduction ironmaking furnace, see Figure 1 - Fig.15 Specifically, it includes a furnace body 1, and a plurality of oxygen blowing components arranged in a surrounding manner are installed on the end wall of the furnace body 1. The oxygen blowing component includes a fixed tube 2 fixedly inserted on the end wall of the furnace body 1, and the lower end of the fixed tube 2 is inclined to the central axis of the furnace body 1. A connecting pipe 201 is slidably inserted in the fixed tube 2, and the lower end of the connecting pipe 201 is inside the furnace body 1. A bent structure 202 is arranged on the connecting pipe 201 near its lower end. An oxygen blowing head 3 is installed at the lower end of the connecting pipe 201, and an oxygen blowing flow channel 301 connected with the connecting pipe 201 is opened on the central axis of the oxygen blowing head 3, and the oxygen blowing flow channel 301 points to the central position of the furnace body 1, and a high temperature resistant floating plate 5 is installed at the connection between the connecting pipe 201 and the oxygen blowing head 3.

[0053] During use of the device, high-concentration oxygen is delivered into the furnace body 1 through the oxygen blowing assembly, and the oxygen enters the oxygen blowing channel 301 through the connecting pipe 201, and is blown toward the center of the furnace body 1 through the oxygen blowing channel 301. When reduction ironmaking is carried out, along with the melting of the raw materials, the amount of molten iron in the furnace body 1 gradually increases. If the position of the oxygen blowing head 3 cannot be changed, the oxygen blowing head 3 will be inserted too deeply into the molten iron. During subsequent reduction ironmaking, if the oxygen blowing head 3 is inserted too deeply, not only will the oxygen rush directly to the bottom of the furnace and destroy the furnace lining, but the oxygen impact will be too deep, causing the molten iron in the furnace body 1 to splash violently, affecting the stability of reduction ironmaking.

[0054] In the present application, the connecting pipe 201 is slidably inserted in the fixed tube 2, so that the position height of the oxygen blowing head 3 installed at the lower end of the connecting pipe 201 can be flexibly adjusted, and the high-temperature resistant floating plate 5 floats on the slag in the furnace body 1. When the height of the slag in the furnace body 1 changes due to the increase or decrease of the molten iron at the bottom of the furnace, the position height of the high-temperature resistant floating plate 5 floating on the slag will change synchronously. With the help of the high-temperature resistant floating plate 5, the position of the oxygen blowing head 3 is adjusted, so that the position of the oxygen blowing head 3 can be automatically adjusted synchronously with the change of the slag height, which is conducive to ensuring that the positional relationship between the oxygen blowing head 3 and the molten iron at the bottom of the furnace is relatively stable. Compared with the technical solution of fixing the oxygen blowing tuyere at a specific position in the furnace body 1 in the prior art, the device can prevent the oxygen blowing head 3 from being inserted too deep due to the increase in the amount of molten iron at the bottom of the furnace, thereby improving the stability of reduction ironmaking to a certain extent.

[0055] The inclination angle between the fixed tube 2 and the horizontal plane is greater than 45°. Under this angle setting, when the high temperature resistant floating plate 5 drives the connecting pipe 201 to move up and down, it can slide more smoothly in the fixed tube 2, which is conducive to ensuring the stability of the lifting and lowering adjustment of the oxygen blowing head 3.

[0056] In the specific implementation process, Figure 7 As shown, a limit block 203 is fixedly installed on the outer end wall of the connecting tube 201, and a slide groove adapted to the limit block 203 is provided on the inner end wall of the fixed cylinder 2, and the slide groove is arranged parallel to the connecting tube 201. During the use of the device, the limit block 203 is fixedly installed on the inner end wall of the connecting tube 201. With the adaptation of the limit block 203 and the slide groove provided on the inner end wall of the fixed cylinder 2, the sliding of the connecting tube 201 is restricted, and the connecting tube 201 can only slide axially along the fixed cylinder 2, limiting the radial deflection of the connecting tube 201, which can effectively ensure the stability of the position adjustment of the oxygen blowing head 3 by the floating of the high-temperature resistant floating plate 5 on the slag.

[0057] In the specific implementation process, Figure 5 As shown, a plurality of oxygen blowing assemblies are evenly distributed on the end wall of the furnace body 1, at least three oxygen blowing assemblies are provided, and the number of oxygen blowing assemblies is set to an odd number. During the use of the device, by evenly surrounding and installing at least three oxygen blowing assemblies on the end wall of the furnace body 1, a plurality of oxygen blowing assemblies are arranged around the center position of the furnace body 1, oxygen blowing operations can be evenly and stably performed from multiple directions toward the center position of the furnace body 1, and since the number of oxygen blowing assemblies is set to an odd number, there will not be another oxygen blowing assembly opposite to each oxygen blowing assembly, which can avoid the oxygen flow collision formed in the furnace body 1 due to the symmetrical arrangement of the two oxygen blowing assemblies, which is beneficial to further improve the stability of reduction ironmaking through the device.

[0058] In the specific implementation process, Figure 6 and Fig.12As shown, a sleeve 501 arranged between the curved structure 202 and the oxygen blowing head 3 is rotatably sleeved on the connecting pipe 201, and the sleeve 501 is fastened to the connecting pipe 201 by bolts, a vertically arranged slide bar 502 is fixedly installed on the sleeve 501, and the high temperature resistant floating plate 5 is slidably sleeved on the outer side of the slide bar 502, and the high temperature resistant floating plate 5 is fastened to the slide bar 502 by bolts. During the use of the device, the bolts installed on the sleeve 501 can be squeezed on the outer end wall of the connecting pipe 201 by twisting, and the bolts installed on the high temperature resistant floating plate 5 can be squeezed on the outer end wall of the slide bar 502 by twisting. When the high temperature resistant floating plate 5 is used to drive the oxygen blowing head 3 to adjust its position, the height difference between the high temperature resistant floating plate 5 and the oxygen blowing head 3 can also be adjusted.

[0059] When in use, the staff selects the high temperature resistant floating plate 5 to be above or below the oxygen blowing head 3 according to the specific environment during actual production. The staff can loosen the bolts on the collar 501 to release the restrictions of the collar 501 and the connecting pipe 201, and adjust the slide bar 502 to be vertically upward or vertically downward by rotating the collar 501. When the position of the slide bar 502 is adjusted, the bolts on the collar 501 are tightened again to ensure that the position of the slide bar 502 is stable. When the slide bar 502 is vertically downward, the high temperature resistant floating plate 5 is below the oxygen blowing head 3, which makes the high temperature resistant floating plate 5 suspended on the slag, the oxygen blowing head 3 is on the upper layer of the slag, and the oxygen blowing flow channel 301 in the oxygen blowing head 3 Oxygen blowing operation is performed on the space above the slag in the furnace body 1. When the slide bar 502 is vertically upward, the high temperature resistant floating plate 5 is above the oxygen blowing head 3. This allows the high temperature resistant floating plate 5 to float on the slag, and the oxygen blowing head 3 can sink into the molten iron under the slag to perform oxygen blowing operation on the inside of the molten iron. The staff can loosen the bolts on the high temperature resistant floating plate 5 to release the restrictions of the high temperature resistant floating plate 5 and the slide bar 502, and slide the high temperature resistant floating plate 5 up and down to adjust the height difference between the high temperature resistant floating plate 5 and the oxygen blowing head 3. The arrangement of the above structure allows the device to flexibly adjust the position of the oxygen blowing head 3 according to the actual situation during production, which improves the flexibility of the device during use to a certain extent.

[0060] In the specific implementation process, Figure 2 , Fig.10 and Fig.13As shown, a recess 302 connected to the outside of the port of the oxygen blowing channel 301 is provided at one end of the oxygen blowing head 3 away from the connecting pipe 201, and a plurality of first spray holes 303 arranged around the oxygen blowing channel 301 are provided on the annular surface in the recess 302, and the first spray holes 303 are arranged parallel to the oxygen blowing channel 301, a plurality of second spray holes 304 arranged around the oxygen blowing channel 301 are provided on the cylindrical surface in the recess 302, and the second spray holes 304 are inclined toward the central axis direction of the oxygen blowing channel 301, and a plurality of third spray holes 305 distributed around the outside of the recess 302 are provided at one end of the oxygen blowing head 3 away from the connecting pipe 201, and the third spray holes 305 are inclined toward the direction away from the central axis of the oxygen blowing channel 301.

[0061] During the use of the device, according to the actual production needs, the first spray hole 303, the second spray hole 304 and the third spray hole 305 are controlled to spray airflow, and the gas sprayed from the first spray hole 303, the second spray hole 304 and the third spray hole 305 is a safe and stable inert gas, which can be nitrogen. Since the plurality of first spray holes 303 are distributed on the annular surface inside the recess 302, the plurality of second spray holes 304 are distributed on the cylindrical surface inside the recess 302, and the plurality of third spray holes 305 are distributed on the end of the oxygen blowing head 3, the plurality of first spray holes 303, the plurality of The second spray hole 304 and the plurality of third spray holes 305 are all surrounded by the outside of the port of the oxygen blowing channel 301. When the high-speed airflow is ejected outward through the first spray hole 303, the second spray hole 304 and the third spray hole 305, an airflow wall wrapped around the outside of the port of the oxygen blowing channel 301 can be formed, and an isolated airflow is formed at the end of the oxygen blowing head 3. This can prevent the combustible gas in the furnace body 1 from flowing to the end of the oxygen blowing head 3 during the oxygen blowing process, and prevent the combustible gas from deflagrating with high-concentration oxygen at the end of the oxygen blowing head 3, causing the oxygen blowing head 3 to be burned, which is beneficial to ensuring the stability of the oxygen blowing head 3 during actual use.

[0062] During actual use, since the first spray hole 303 is arranged in parallel with the oxygen blowing channel 301, the air flow wall formed by blowing out from the first spray hole 303 presents a straight cylindrical structure. With the guidance of the air flow wall, the oxygen sprayed from the oxygen blowing channel 301 can be directly directed to the inner center position of the furnace body 1, which is convenient for ensuring the stability of high-concentration oxygen being transported to the inner center position of the furnace body 1 during oxygen blowing. Since the second spray hole 304 is inclined toward the central axis direction of the oxygen blowing channel 301, when the oxygen blowing operation is not performed in the oxygen blowing channel 301, the air flow wall formed by blowing out from the second spray hole 304 will intersect at the outer side of the port of the oxygen blowing head 3 to form a round cover-shaped protection. The port of the oxygen flow channel 301 is blocked to prevent the airflow and dust in the furnace body 1 from entering the oxygen blowing flow channel 301 when no oxygen is blown. Active protection of the oxygen blowing flow channel 301 is beneficial to extending the service life of the device. Since the third nozzle 305 is inclined in a direction away from the central axis of the oxygen blowing flow channel 301, the airflow wall formed by blowing out through the third nozzle 305 presents a trumpet-shaped structure. With the guidance of the airflow wall, the oxygen sprayed from the oxygen blowing flow channel 301 can diffuse outward. When there is no need to centrally supply oxygen to the center of the furnace body 1, the trumpet-shaped airflow wall can be used to improve the efficiency and comprehensiveness of oxygen filling in the furnace body 1.

[0063] In the specific implementation process, Figure 2 , Fig.10 and Fig.15 As shown, an airflow switching mechanism is provided in the oxygen blowing head 3, and the airflow switching mechanism includes an annular cavity 4 arranged around the outside of the oxygen blowing flow channel 301, and a first interface 401, a second interface 402 and a third interface 403 are sequentially provided on the end wall of the annular cavity 4 close to the oxygen blowing flow channel 301. The first interface 401 is connected to the first spray hole 303, the second interface 402 is connected to the second spray hole 304, and the third interface 403 is connected to the third spray hole 305. An airflow cavity 404 is provided on the outside of the annular cavity 4, and a fourth interface 404 is connected between the airflow cavity 404 and the annular cavity 4. 405, a ring block 406 is slidably installed in the ring cavity 4, a spring 407 is fixedly connected between the inner end wall of the ring cavity 4 and the ring block 406, a fifth interface 408 is provided on the end wall of the ring block 406 close to the first interface 401, the second interface 402 and the third interface 403, a sixth interface 409 connected to the fifth interface 408 is provided on the end wall of the ring block 406 close to the fourth interface 405, and a first air flow channel 204 connected to the ring cavity 4, and a second air flow channel 205 connected to the air flow cavity 404 are provided in the end wall of the connecting pipe 201.

[0064] During use of the device, the first interface 401, the second interface 402, the third interface 403 and the fourth interface 405 are provided on the inner end walls on both sides corresponding to the inside and outside of the ring cavity 4, the fifth interface 408 and the sixth interface 409 are provided on both sides corresponding to the inside and outside of the ring block 406, and the size of the sixth interface 409 is set large enough so that when the ring block 406 is slid and adjusted, the sixth interface 409 is always connected with the fourth interface 405, and the airflow that pushes the ring block 406 to move is input through the side of the inside of the ring cavity 4 close to the first interface 401. The size of the ring block 406 is set large, and even when the fifth interface 408 is docked with the third interface 403, the ring block 406 can still complete the covering and blocking of the first interface 401.

[0065] When air suction is not performed under normal conditions, the ring block 406 is located in the middle position of the ring cavity 4 by means of the connection of the spring 407. At this time, the fifth interface 408 provided on the ring block 406 is connected to the second interface 402, and the sixth interface 409 provided on the ring block 406 is connected to the fourth interface 405. The first interface 401 is covered and blocked by the ring block 406. The airflow entering the airflow cavity 404 enters the inside of the ring block 406 through the connection between the fourth interface 405 and the sixth interface 409, and then is ejected from the second spray hole 304 through the connection between the fifth interface 408 and the second interface 402, forming a round cover-shaped airflow wall at the end of the oxygen blowing head 3.

[0066] When the airflow is charged into the annular cavity 4, the annular block 406 moves toward the third interface 403 under the push of the airflow, and squeezes the spring 407. At this time, the fifth interface 408 provided on the annular block 406 is connected with the third interface 403, and the sixth interface 409 provided on the annular block 406 is connected with the fourth interface 405. The first interface 401 is covered and blocked by the annular block 406. The airflow in the airflow cavity 404 is ejected from the third spray hole 305 through the connection between the fifth interface 408 and the third interface 403, forming a trumpet-shaped airflow wall at the end of the oxygen blowing head 3.

[0067] When the annular cavity 4 is evacuated, the force applied to the water inlet 206 by air suction causes the water inlet 206 to move toward the first interface 401 and pull the spring 407. At this time, the fifth interface 408 provided on the annular block 406 is docked with the first interface 401, and the sixth interface 409 provided on the annular block 406 is docked with the fourth interface 405. The airflow in the airflow cavity 404 is ejected from the first spray hole 303 through the docking of the fifth interface 408 and the first interface 401, forming a cylindrical airflow wall at the end of the oxygen blowing head 3.

[0068] By adjusting the structure inside the airflow switching mechanism, the airflow supply states in the first nozzle 303, the second nozzle 304 and the third nozzle 305 are flexibly switched, and the airflow switching mechanism is integrated in the oxygen blowing head 3, so that the first nozzle 303, the second nozzle 304 and the third nozzle 305 can share a larger diameter airflow channel, and use a smaller diameter airflow channel to control the airflow switching mechanism. Compared with preparing a larger diameter airflow channel for each of the first nozzle 303, the second nozzle 304 and the third nozzle 305, it can effectively avoid that more large diameter airflow channels are opened in the end wall of the connecting pipe 201, so as to ensure the stability and flexibility of the device during actual operation.

[0069] In the specific implementation process, Figure 2 As shown, a cooling water chamber 6 is provided in the oxygen blowing head 3, and a water inlet 206 and a water return 207 connected to the cooling water chamber 6 are provided in the end wall of the connecting pipe 201. The water inlet 206 and the water return 207 are arranged in a double helical structure in an interlaced manner in the end wall of the connecting pipe 201. During the use of the device, cooling water enters the cooling water chamber 6 provided in the oxygen blowing head 3 through the water inlet 206, and is then discharged through the water return 207, which can effectively reduce the temperature of the oxygen blowing head 3 and avoid the oxygen blowing head 3 from overheating. In order to prevent the temperature from being too high and burning, the water inlet 206 and the water return 207 are staggered in a double spiral in the end wall of the connecting pipe 201, so that the temperature of the connecting pipe 201 can be controlled when the cooling water flows in the water inlet 206 and the water return 207, which is beneficial to ensure the stability of the connecting pipe 201 extending into the furnace body 1 during actual use. The staggered arrangement of the double spirals allows the cooling water to contact the connecting pipe 201 more evenly when it is supplied and flows out, which is beneficial to ensure the stability of temperature control.

[0070] In the specific implementation process, Figure 2 , Fig.10 and Fig.11As shown, the outer side of the lower end of the connecting pipe 201 is equipped with an external thread, and the oxygen blowing head 3 is screwed on the lower end of the connecting pipe 201. The oxygen blowing head 3 is provided with a first butt joint pipe 7 that is butt jointed with the first air flow channel 204, a second butt joint pipe 701 that is butt jointed with the second air flow channel 205, and a butt joint 702 that is butt jointed with the water inlet channel 206 and the water return channel 207. The first butt joint pipe 7 is connected to the annular cavity 4, the second butt joint pipe 701 is connected to the air flow cavity 404, and the butt joint 702 is connected to the cooling water cavity 6. During the use of the device, the airflow that controls the movement of the water inlet channel 206 passes through the butt joint of the first air flow channel 204 and the first butt joint pipe 7, enters the interior of the annular cavity 4, and is input The airflows of the first spray hole 303, the second spray hole 304 and the third spray hole 305 enter the airflow chamber 404 through the connection between the second airflow channel 205 and the second docking tube 701. The cooling water transported in the water inlet 206 enters the cooling water chamber 6 through the docking port 702 opened at the bottom, and then flows back to the return water channel 207 through the docking port 702 opened at the top. The oxygen blowing head 3 is installed on the outer side of the lower end of the connecting pipe 201 by means of a spiral connection. During daily maintenance, the oxygen blowing head 3 can be conveniently removed for maintenance, and can be flexibly replaced if the oxygen blowing head 3 is damaged, which is conducive to improving the convenience of staff in inspecting and maintaining the device.

[0071] In the specific implementation process, Figure 3 , Figure 7 and Figure 8 As shown, the upper end of the fixed cylinder 2 is fixedly connected with a sleeve 8 movably sleeved on the outside of the connecting pipe 201, and the upper end of the sleeve 8 is bent and fixedly connected with the inside of the furnace body 1, an oxygen supply pipe 801 movably inserted in the connecting pipe 201 is fixedly installed in the sleeve 8, and the upper end of the oxygen supply pipe 801 extends to the outside of the sleeve 8, four circumferentially distributed pipe joints 802 are fixedly installed on the lower outer end wall of the sleeve 8, and four circumferentially distributed through grooves 803 are opened on the upper outer end wall of the connecting pipe 201, the four through grooves 803 are all arranged parallel to the connecting pipe 201, and correspond one by one to the four pipe joints 802, and the four through grooves 803 are respectively connected with the first air flow channel 204, the second air flow channel 205, the water inlet channel 206 and the water return channel 207.

[0072] During the use of the device, the sleeve 8 is sleeved on the outer side of the upper end of the connecting pipe 201 and is connected to the interior of the furnace body 1, which makes the air pressure strength at the upper end of the connecting pipe 201 consistent with the air pressure strength at the lower end of the connecting pipe 201, and can avoid the high temperature resistant floating plate 5 driving the connecting pipe 201 to move up and down and be affected by the internal and external pressure difference, which is beneficial to ensure the stability of the device during operation. In addition, during the sliding adjustment process of the connecting pipe 201, four through grooves 803 respectively connected to the first airflow channel 204, the second airflow channel 205, the water inlet channel 206 and the water return channel 207 are opened on the connecting pipe 201, and the pipe joints 802 corresponding to the through grooves 803 are fixedly installed on the sleeve 8, so that the sliding of the connecting pipe 201 will not affect the airflow and the supply of cooling water. At the same time, the inflow speed and the outflow speed of the cooling water are consistent, and the supply of cooling water will not interfere with the sliding of the connecting pipe 201. Under the cooperation with each other, the stability of the device during operation is further ensured.

[0073] Specifically, the working principle and operation method of the present invention are as follows:

[0074] Since the connecting tube 201 is slidably inserted in the fixed tube 2, and a high temperature resistant floating plate 5 is installed at the lower end of the connecting tube 201, the high temperature resistant floating plate 5 is lifted by the slag in the furnace body 1, so that when the height of the slag changes due to the increase or decrease of the molten iron, the relative position of the oxygen blowing head 3 and the molten iron remains stable, and the position of the high temperature resistant floating plate 5 is pre-adjusted before use, and the height difference between the high temperature resistant floating plate 5 and the oxygen blowing head 3 can be adjusted to adapt to different production needs. The airflow supply control is performed on the first spray hole 303, the second spray hole 304 and the third spray hole 305 through the airflow switching mechanism. The airflow ejected from the first nozzle 303 will form a cylindrical airflow wall at the end of the oxygen blowing head 3, ensuring that the oxygen in the oxygen blowing channel 301 can be directly blown to the center of the furnace body 1 for concentrated oxygen blowing. The airflow ejected from the second nozzle 304 will form a round cover-shaped airflow wall at the end of the oxygen blowing head 3, reducing the probability of airflow dust in the furnace body 1 entering the oxygen blowing channel 301. The airflow ejected from the third nozzle 305 will form a trumpet-shaped airflow wall at the end of the oxygen blowing head 3, ensuring that the oxygen in the oxygen blowing channel 301 can be efficiently and comprehensively dispersed in the furnace body 1 for dispersed oxygen blowing.

[0075] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An oxygen tuyere for a smelting reduction ironmaking furnace, comprising a furnace body (1), characterized in that: A plurality of oxygen blowing components arranged in a surrounding manner are mounted on the end wall of the furnace body (1). The oxygen blowing components include a fixed tube (2) fixedly inserted on the end wall of the furnace body (1), and the lower end of the fixed tube (2) is inclined toward the central axis of the furnace body (1). A connecting pipe (201) is slidably inserted in the fixed tube (2), and the lower end of the connecting pipe (201) is located inside the furnace body (1). A bent structure (202) is arranged on the connecting pipe (201) near its lower end. An oxygen blowing head (3) is mounted on the lower end of the connecting pipe (201), and an oxygen blowing channel (301) communicating with the connecting pipe (201) is provided on the central axis of the oxygen blowing head (3). The oxygen blowing channel (301) points to the central position inside the furnace body (1), and a high temperature resistant floating plate (5) is installed at the connection between the connecting pipe (201) and the oxygen blowing head (3).

2. The oxygen blowing tuyere of a smelting reduction ironmaking furnace according to claim 1, characterized in that: A limit block (203) is fixedly mounted on the outer end wall of the connecting tube (201), and a slide groove adapted to the limit block (203) is provided on the inner end wall of the fixing cylinder (2), and the slide groove is arranged parallel to the connecting tube (201).

3. The oxygen blowing tuyere of a smelting reduction ironmaking furnace according to claim 1, characterized in that: The plurality of oxygen blowing assemblies are evenly distributed on the end wall of the furnace body (1), at least three oxygen blowing assemblies are provided, and the number of the oxygen blowing assemblies is set to an odd number.

4. The oxygen blowing tuyere of a smelting reduction ironmaking furnace according to claim 1, characterized in that: A sleeve (501) is rotatably sleeved on the connecting pipe (201) and is arranged between the curved structure (202) and the oxygen blowing head (3). The sleeve (501) is fastened to the connecting pipe (201) by bolts. A vertically arranged sliding rod (502) is fixedly mounted on the sleeve (501). The high temperature resistant floating plate (5) is slidably sleeved on the outer side of the sliding rod (502). The high temperature resistant floating plate (5) is fastened to the sliding rod (502) by bolts.

5. The oxygen blowing tuyere of a smelting reduction ironmaking furnace according to claim 1, characterized in that: The oxygen blowing head (3) is provided with a recess (302) at one end away from the connecting pipe (201) and connected to the outside of the port of the oxygen blowing channel (301), and a plurality of first spray holes (303) arranged around the oxygen blowing channel (301) are provided on a circular ring surface in the recess (302), and the first spray holes (303) are arranged in parallel with the oxygen blowing channel (301). A plurality of second spray holes (304) are provided on a cylindrical surface in the recess (302) and arranged around the oxygen blowing channel (301), and the second spray holes (304) are arranged obliquely toward the central axis of the oxygen blowing channel (301). A plurality of third spray holes (305) are provided at one end away from the connecting pipe (201) and distributed around the outside of the recess (302), and the third spray holes (305) are arranged obliquely toward a direction away from the central axis of the oxygen blowing channel (301).

6. The oxygen blowing tuyere of a smelting reduction ironmaking furnace according to claim 5, characterized in that: The oxygen blowing head (3) is provided with an airflow switching mechanism, and the airflow switching mechanism comprises an annular cavity (4) arranged around the outer side of the oxygen blowing channel (301), and a first interface (401), a second interface (402) and a third interface (403) are sequentially provided on the end wall of the annular cavity (4) close to the oxygen blowing channel (301), the first interface (401) is communicated with the first spray hole (303), the second interface (402) is communicated with the second spray hole (304), and the third interface (403) is communicated with the third spray hole (305), an airflow cavity (404) is provided on the outer side of the annular cavity (4), and a fourth interface (404) is communicated between the airflow cavity (404) and the annular cavity (4). 5), a ring block (406) is slidably installed in the annular cavity (4), a spring (407) is fixedly connected between the inner end wall of the annular cavity (4) and the ring block (406), a fifth interface (408) is provided on the end wall of the annular block (406) close to the first interface (401), the second interface (402) and the third interface (403), a sixth interface (409) connected to the fifth interface (408) is provided on the end wall of the annular block (406) close to the fourth interface (405), and a first air flow channel (204) connected to the annular cavity (4) and a second air flow channel (205) connected to the air flow cavity (404) are provided in the end wall of the connecting pipe (201).

7. The oxygen blowing tuyere of a smelting reduction ironmaking furnace according to claim 6, characterized in that: A cooling water chamber (6) is provided in the oxygen blowing head (3), and a water inlet channel (206) and a water return channel (207) connected to the cooling water chamber (6) are provided in the end wall of the connecting pipe (201). The water inlet channel (206) and the water return channel (207) are arranged in a double helical structure in an alternating manner in the end wall of the connecting pipe (201).

8. The oxygen blowing tuyere of a smelting reduction ironmaking furnace according to claim 7, characterized in that: The outer side of the lower end of the connecting pipe (201) is equipped with an external thread, and the oxygen blowing head (3) is screwed on the lower end of the connecting pipe (201). The oxygen blowing head (3) is provided with a first butt joint pipe (7) butt jointed with the first air flow channel (204), a second butt joint pipe (701) butt jointed with the second air flow channel (205), and a butt joint (702) butt jointed with the water inlet channel (206) and the water return channel (207). The first butt joint pipe (7) is connected to the annular cavity (4), the second butt joint pipe (701) is connected to the air flow cavity (404), and the butt joint (702) is connected to the cooling water cavity (6).

9. The oxygen blowing tuyere of a smelting reduction ironmaking furnace according to claim 7, characterized in that: The upper end of the fixed cylinder (2) is fixedly connected to a sleeve (8) movably sleeved on the outside of the connecting tube (201), and the upper end of the sleeve (8) is bent and fixedly connected to the inside of the furnace body (1), and an oxygen supply pipe (801) movably inserted in the connecting tube (201) is fixedly installed in the sleeve (8), and the upper end of the oxygen supply pipe (801) extends to the outside of the sleeve (8).

10. The oxygen blowing tuyere of a smelting reduction ironmaking furnace according to claim 9, characterized in that: Four circumferentially distributed pipe joints (802) are fixedly mounted on the lower outer end wall of the sleeve (8), and four circumferentially distributed through grooves (803) are opened on the upper outer end wall of the connecting pipe (201). The four through grooves (803) are arranged in parallel with the connecting pipe (201) and correspond one-to-one to the four pipe joints (802). The four through grooves (803) are respectively connected to the first air flow channel (204), the second air flow channel (205), the water inlet channel (206) and the water return channel (207).

Images