An oxygen-blowing tuyere for a smelting reduction ironmaking furnace

Abstract

The present invention discloses an oxygen-blowing tuyere for a smelting reduction iron-making furnace, which relates to the technical field of reduction iron-making. In the present invention, a connecting pipe is slidably inserted into a fixed cylinder, and a high-temperature resistant floating plate is installed at the connection between the connecting pipe and the oxygen-blowing head. By means 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 positional relationship, which is beneficial to avoiding the oxygen-blowing head from being inserted too deep due to the increase of molten iron in the furnace body, and improves the stability during smelting reduction iron-making to a certain extent. At the same time, by providing a first spray hole, a second spray hole and a third spray hole to carry out air flow spraying at the end of the oxygen-blowing head, an isolated air flow can be formed at the end of the oxygen-blowing head, avoiding the flammable gas from flowing to the end of the oxygen-blowing head and causing deflagration, which is beneficial to extending the service life of the oxygen-blowing head.

Description

Technical Field

[0001] The present invention relates to the field of reduced ironmaking, and particularly relates to an oxygen-blowing tuyere of a smelting reduction ironmaking furnace. Background Art

[0002] During the oxygen-blowing process of a smelting reduction ironmaking furnace, high-purity oxygen is blown into the furnace body through an 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 molten iron level gradually rises due to the reduction and melting of the raw materials in the furnace body, 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 becomes too large, which will not only cause the oxygen to directly impact the furnace bottom and damage the furnace lining, but also cause severe splashing of the molten iron in the furnace body, affecting the stability of reduced ironmaking.

[0003] Therefore, an oxygen-blowing tuyere of a smelting reduction ironmaking furnace is proposed to solve some problems existing in the above-mentioned prior art. Summary of the Invention

[0004] The purpose of the present invention is to solve the disadvantages existing in the prior art that the position of the oxygen-blowing tuyere for reduced ironmaking cannot be automatically adjusted according to the increase or decrease of the molten iron in the furnace body, resulting in too deep insertion of the oxygen-blowing tuyere into the molten iron in the later stage of smelting reduction ironmaking and affecting the stability of reduced ironmaking, and to propose an oxygen-blowing tuyere of a smelting reduction ironmaking furnace.

[0005] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0006] An oxygen-blowing tuyere of a smelting reduction ironmaking furnace includes a furnace body. A plurality of circumferentially arranged oxygen-blowing components are installed on the end wall of the furnace body. The oxygen-blowing component includes a fixed cylinder fixedly inserted through the end wall of the furnace body, and the lower end of the fixed cylinder is inclined towards the central axis of the furnace body. A connecting pipe is slidably inserted into the fixed cylinder, and the lower end of the connecting pipe is inside the furnace body. A bending structure is provided at a position near the lower end of the connecting pipe. The lower end of the connecting pipe is installed with an oxygen-blowing head, and an oxygen-blowing channel communicating with the connecting pipe is axially opened through the center of the oxygen-blowing head. The oxygen-blowing channel points to the central position inside the furnace body. A high-temperature resistant floating plate is installed at the connection between the connecting pipe and the oxygen-blowing head.

[0007] Preferably, a limiting block is fixedly installed on the outer end wall of the connecting pipe, and a sliding groove adapted to the limiting block is opened on the inner end wall of the fixed cylinder, and the sliding groove is arranged parallel to the connecting pipe.

[0008] Preferably, a plurality of oxygen-blowing components are evenly distributed on the end wall of the furnace body. At least 3 oxygen-blowing components are provided, and the number of oxygen-blowing components is set to an odd number.

[0009] Preferably, a collar is rotatably sleeved on the connecting pipe and is arranged between the bending structure and the oxygen lance head. The collar is fixedly connected to the connecting pipe by bolts. A vertically arranged sliding rod is fixedly installed on the collar. The high-temperature resistant floating plate is slidably sleeved on the outer side of the sliding rod and is fixedly connected to the sliding rod by bolts.

[0010] Preferably, one end of the oxygen lance head far away from the connecting pipe is provided with a notch communicated with the outside of the port of the oxygen blowing flow channel. A plurality of first spray holes surrounding the oxygen blowing flow channel are arranged on the circular ring surface in the notch. The first spray holes are arranged parallel to the oxygen blowing flow channel. A plurality of second spray holes surrounding the oxygen blowing flow channel are arranged on the cylindrical surface in the notch, and the second spray holes are inclined towards the central axis direction of the oxygen blowing flow channel. A plurality of third spray holes surrounding and distributed outside the notch are arranged at one end of the oxygen lance head far away from the connecting pipe, and the third spray holes are inclined towards the direction away from the central axis of the oxygen blowing flow channel.

[0011] Preferably, an air flow switching mechanism is arranged in the oxygen lance head. The air flow switching mechanism includes an annular cavity surrounding the outside of the oxygen blowing flow channel. First interfaces, second interfaces and third interfaces are sequentially arranged on the end wall of the annular cavity close to the oxygen blowing flow channel. The first interface is communicated with the first spray hole, the second interface is communicated with the second spray hole, and the third interface is communicated with the third spray hole. An air flow cavity is arranged outside the annular cavity, and a fourth interface is communicated between the air flow cavity and the annular cavity. An annular block is slidably installed in the annular cavity. A spring is fixedly connected between the inner end wall of the annular cavity and the annular block. Fifth interfaces are arranged on the end wall of the annular block close to the first interface, the second interface and the third interface. A sixth interface communicated with the fifth interface is arranged on the end wall of the annular block close to the fourth interface. A first air flow channel communicated with the annular cavity and a second air flow channel communicated with the air flow cavity are arranged in the end wall of the connecting pipe.

[0012] Preferably, a cooling water cavity is arranged in the oxygen lance head. An inlet channel and a return channel communicated with the cooling water cavity are arranged in the end wall of the connecting pipe. The inlet channel and the return channel are arranged in a double spiral structure and are staggered in the end wall of the connecting pipe.

[0013] Preferably, an external thread is assembled on the outer side of the lower end of the connecting pipe. The oxygen lance head is screwed onto the lower end of the connecting pipe. A first docking pipe docked with the first air flow channel, a second docking pipe docked with the second air flow channel, and docking ports docked with the inlet channel and the return channel are arranged in the oxygen lance head. The first docking pipe is communicated with the annular cavity, the second docking pipe is communicated with the air flow cavity, and the docking ports are communicated with the cooling water cavity.

[0014] Preferably, the upper end of the fixed cylinder is fixedly connected with a sleeve sleeved on the outside of the connecting pipe. The upper end of the sleeve is bent and fixedly communicated with the inside of the furnace body. An oxygen supply pipe movably inserted into the connecting pipe is fixedly installed in the sleeve, and the upper end of the oxygen supply pipe extends to the outside of the sleeve.

[0015] Preferably, four circumferentially distributed pipe joints are fixedly installed on the lower outer end wall of the casing, and four circumferentially distributed through grooves are formed on the upper outer end wall of the connecting pipe. The four through grooves are all arranged parallel to the connecting pipe and correspond to the four pipe joints one by one. The four through grooves are respectively communicated with the first air flow channel, the second air flow channel, the water inlet channel and the water return channel.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. In the present invention, by sliding the connecting pipe into the fixed cylinder and installing the high-temperature resistant floating plate at the connection between the connecting pipe and the oxygen lance head, and relying on 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 lance head can be adjusted synchronously, so that the oxygen lance head and the molten iron in the furnace body are always in a relatively stable positional relationship, which is beneficial to avoiding the oxygen lance head being inserted too deep due to the increase of molten iron in the furnace body, and to a certain extent improves the stability during smelting reduction ironmaking;

[0018] 2. In the present invention, by evenly and circumferentially installing at least 3 oxygen blowing components on the end wall of the furnace body, oxygen blowing operations can be carried out from multiple directions to the central position of the furnace body evenly and stably. At the same time, by setting the number of oxygen blowing components to an odd number, only one oxygen blowing component will exist on the same straight line, which can avoid the oxygen flow in the furnace body being counteracted due to the symmetric setting of two oxygen blowing components, and is beneficial to further improving the stability of oxygen blowing during reduction ironmaking;

[0019] 3. In the present invention, by rotatably sleeving the collar on the lower end of the connecting pipe and slidingly sleeving the high-temperature resistant floating plate on the vertically arranged sliding rod and fastening it with bolts, the height difference between the high-temperature resistant floating plate and the oxygen lance head can be adjusted in advance, so that the device can flexibly preset the position of the oxygen lance head according to the actual situation during production and control the depth of the oxygen lance head inserted into the molten iron, which improves the flexibility of the device during use to a certain extent;

[0020] 4. In the present invention, by providing the first spray hole, the second spray hole and the third spray hole to spray air flow at the end of the oxygen lance head, an isolated air flow can be formed at the end of the oxygen lance head to avoid the combustible gas flowing to the end of the oxygen lance head and exploding with high-concentration oxygen, resulting in the oxygen lance head being burned out, which is beneficial to extending the service life of the oxygen lance head;

[0021] 5. In the present invention, the air flow wall formed by blowing out from the first spray hole presents a straight cylindrical structure, enabling the oxygen ejected from the oxygen blowing channel to be directly ejected over a long distance, facilitating the centralized oxygen blowing towards the center position of the furnace body. The air flow wall formed by blowing out from the second spray hole forms a circular cover-shaped structure, which plugs the port of the oxygen blowing channel, preventing 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 horn-shaped structure, enabling the oxygen ejected from the oxygen blowing channel to diffuse outwards, facilitating the comprehensive and dispersed oxygen blowing into the furnace body;

[0022] 6. In the present invention, by providing an air flow switching mechanism, the air flow supply states in the first spray hole, the second spray hole, and the third spray hole can be flexibly switched. Integrating the air flow switching mechanism into the oxygen blowing head enables the first spray hole, the second spray hole, and the third spray hole to share a relatively large-diameter air flow channel, and a relatively small-diameter air flow channel is used to control the air flow switching mechanism. This can avoid opening a large number of large-diameter air flow channels in the end wall of the connecting pipe, facilitating the control of the rationality of the thickness of the connecting pipe and ensuring the stable flexibility during the actual operation of the device;

[0023] 7. In the present invention, by opening a cooling water cavity in the oxygen blowing head and forming a continuous flow of cooling water in the cooling water cavity with the help of the water inlet channel and the 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 arranging the water inlet channel and the water return channel in a double spiral structure and intersecting them in the end wall of the connecting pipe, the temperature of the connecting pipe can also be controlled during the flow of the cooling water, which is beneficial to extending the service life of the device;

[0024] 8. In the present invention, by sleeving a sleeve on the outer side of the upper end of the connecting pipe and connecting it to the inside of the furnace body, the air pressure intensity at the upper end of the connecting pipe is made consistent with that at the lower end of the connecting pipe, avoiding the influence of the internal and external pressure difference when the high-temperature floating plate drives the connecting pipe to move up and down for adjustment, which is beneficial to ensuring the stability during the operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and form a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0026] Figure 1 is the front sectional view of the present invention;

[0027] Figure 2 is the present invention Figure 1 the enlarged view of part A in;

[0028] Figure 3 is the present invention Figure 1 the enlarged view of part B in;

[0029] Figure 4 is a perspective view of the present invention;

[0030] Figure 5 is a top sectional view of the present invention;

[0031] Figure 6 is a perspective view of the oxygen blowing assembly of the present invention;

[0032] Figure 7 is an exploded view of the fixed cylinder and the connecting pipe from the front view of the present invention;

[0033] Figure 8 is an exploded view of the fixed cylinder and the connecting pipe from the rear view of the present invention;

[0034] Figure 9 is a front view of the oxygen blowing assembly of the present invention;

[0035] Figure 10 of the present invention Figure 9 is a sectional view at C-C in;

[0036] Figure 11 of the present invention Figure 9 is a sectional view at D-D in;

[0037] Figure 12 is a perspective view of the lower end of the connecting pipe of the present invention;

[0038] Figure 13 is a perspective view of the end of the oxygen blowing head away from the connecting pipe of the present invention;

[0039] Figure 14 is a perspective view of the end of the oxygen blowing head close to the connecting pipe of the present invention;

[0040] Figure 15 is a sectional view of the oxygen blowing head of the present invention.

[0041] Reference numerals in the figure:

[0042] 1. Furnace body;

[0043] 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;

[0044] 3. Oxygen blowing head; 301. Oxygen blowing flow channel; 302. Notch; 303. First spray hole; 304. Second spray hole; 305. Third spray hole;

[0045] 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;

[0046] 5. High-temperature resistant floating plate; 501. Sleeve ring; 502. Slide bar;

[0047] 6. Cooling water cavity;

[0048] 7. First docking pipe; 701. Second docking pipe; 702. Docking interface;

[0049] 8. Sleeve; 801. Oxygen supply pipe; 802. Pipe joint; 803. Through groove. Detailed implementation mode

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0051] Embodiment: This embodiment provides an oxygen blowing tuyere for a smelting reduction ironmaking furnace. Refer to Figure 1 - Figure 15 , specifically, it includes a furnace body 1. 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 cylinder 2 fixedly inserted through the end wall of the furnace body 1, and the lower end of the fixed cylinder 2 is inclined towards the central axis of the furnace body 1. A connecting pipe 201 is slidably inserted into the fixed cylinder 2, and the lower end of the connecting pipe 201 is inside the furnace body 1. A bending structure 202 is arranged on the connecting pipe 201 near its lower end. A blowing oxygen head 3 is installed at the lower end of the connecting pipe 201, and an oxygen blowing flow channel 301 communicating with the connecting pipe 201 is axially penetrated and opened on the central axis inside the blowing oxygen head 3. The oxygen blowing flow channel 301 points to the central position inside the furnace body 1. A high-temperature resistant floating plate 5 is installed at the connection between the connecting pipe 201 and the blowing oxygen head 3.

[0052] During the use of this device, high-concentration oxygen is sent into the furnace body 1 through the oxygen blowing component. The oxygen enters the oxygen blowing flow channel 301 through the connecting pipe 201 and is blown towards the central position inside the furnace body 1 through the oxygen blowing flow channel 301. When carrying out reduction ironmaking, 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 blowing oxygen head 3 cannot be changed, it will cause the blowing oxygen head 3 to be inserted too deeply into the molten iron. During subsequent reduction ironmaking, if the insertion position of the blowing oxygen head 3 is too deep, it will not only cause the oxygen to directly impact the furnace bottom and damage the furnace lining, but also cause the molten iron in the furnace body 1 to splash violently due to the too-deep impact of the oxygen, affecting the stability of reduction ironmaking.

[0053] In this application, the connecting pipe 201 is slidably inserted into the fixed cylinder 2, which enables the height position of the oxygen blowing head 3 installed at the lower end of the connecting pipe 201 to be flexibly adjusted. The high-temperature resistant floating plate 5 floats on the floating slag in the furnace body 1. When the height of the floating slag in the furnace body 1 changes due to the increase or decrease of the molten iron at the furnace bottom, the height position of the high-temperature resistant floating plate 5 floating on the floating slag will change synchronously. With the support 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 floating slag height, which is beneficial to ensuring the relative stability of the position relationship between the oxygen blowing head 3 and the molten iron at the furnace bottom. Compared with the prior art in which the oxygen blowing tuyere is fixed at a specific position in the furnace body 1, this 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 furnace bottom, and to a certain extent improves the stability of reduced ironmaking.

[0054] The inclination angle of the fixed cylinder 2 with respect to the horizontal plane is greater than 45°. With 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 cylinder 2, which is beneficial to ensuring the stability of the lifting adjustment of the oxygen blowing head 3.

[0055] In the specific implementation process, as Figure 7 shown, a limiting block 203 is fixedly installed on the outer end wall of the connecting pipe 201, and a sliding groove adapted to the limiting block 203 is opened on the inner end wall of the fixed cylinder 2, and the sliding groove is arranged parallel to the connecting pipe 201. During the use of this device, the limiting block 203 is fixedly installed on the inner end wall of the connecting pipe 201. With the adaptation of the limiting block 203 and the sliding groove opened on the inner end wall of the fixed cylinder 2, the sliding of the connecting pipe 201 is restricted, and the connecting pipe 201 can only slide axially along the fixed cylinder 2, restricting the radial deflection of the connecting pipe 201, which can effectively ensure the stability of the position adjustment of the oxygen blowing head 3 by means of the floating of the high-temperature resistant floating plate 5 on the floating slag.

[0056] In the specific implementation process, as Figure 5 shown, a plurality of oxygen blowing components are evenly distributed on the end wall of the furnace body 1. At least 3 oxygen blowing components are provided, and the number of oxygen blowing components is set to an odd number. During the use of this device, by evenly surrounding and installing at least 3 oxygen blowing components on the end wall of the furnace body 1, the plurality of oxygen blowing components are arranged around the central position of the furnace body 1, and oxygen blowing operations can be carried out evenly and stably from multiple directions towards the central position of the furnace body 1. Moreover, since the number of oxygen blowing components is set to an odd number, there will be no other oxygen blowing component opposite to each oxygen blowing component, which can prevent the formation of an oxygen flow countercurrent in the furnace body 1 due to the symmetrical setting of two oxygen blowing components, and is beneficial to further improving the stability of reduced ironmaking by this device.

[0057] In the specific implementation process, as Figure 6 and Figure 12As shown, a collar 501 is rotatably sleeved on the connecting pipe 201 and is arranged between the bending structure 202 and the oxygen lance head 3. The collar 501 is fixedly connected to the connecting pipe 201 by bolts. A vertically arranged sliding rod 502 is fixedly installed on the collar 501. The high-temperature resistant floating plate 5 is slidably sleeved on the outer side of the sliding rod 502 and is fixedly connected to the sliding rod 502 by bolts. During the use of the device, the bolts installed on the collar 501 can be screwed to squeeze on the outer end wall of the connecting pipe 201, and the bolts installed on the high-temperature resistant floating plate 5 can be screwed to squeeze on the outer end wall of the sliding rod 502. When the device adjusts the position of the oxygen lance head 3 by means of the high-temperature resistant floating plate 5, the height difference between the high-temperature resistant floating plate 5 and the oxygen lance head 3 can also be adjusted.

[0058] During use, the staff selects whether the high-temperature resistant floating plate 5 is above or below the oxygen lance head 3 according to the specific environment during actual production. The staff can loosen the bolts on the collar 501 to release the restriction between the collar 501 and the connecting pipe 201, and adjust the sliding rod 502 vertically upward or downward by rotating the collar 501. After the position of the sliding rod 502 is adjusted, the bolts on the collar 501 are tightened again to ensure the stable position of the sliding rod 502. When the sliding rod 502 is vertically downward, the high-temperature resistant floating plate 5 is below the oxygen lance head 3, which enables the high-temperature resistant floating plate 5 to float on the slag while the oxygen lance head 3 is above the slag layer. The oxygen blowing channel 301 in the oxygen lance head 3 blows oxygen into the space above the slag in the furnace body 1. When the sliding rod 502 is vertically upward, the high-temperature resistant floating plate 5 is above the oxygen lance head 3, which enables the high-temperature resistant floating plate 5 to float on the slag while the oxygen lance head 3 can sink into the molten iron under the slag to blow oxygen into the molten iron. The staff can loosen the bolts on the high-temperature resistant floating plate 5 to release the restriction between the high-temperature resistant floating plate 5 and the sliding rod 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 lance head 3. The above structure enables the device to flexibly adjust the position of the oxygen lance head 3 according to the actual situation during production, which improves the flexibility of the device during use to a certain extent.

[0059] In the specific implementation process, such as Figure 2 、 Figure 10 and Figure 13As shown, one end of the oxygen lance head 3 far from the connecting pipe 201 is provided with a notch 302 communicating with the outside of the port of the oxygen blowing flow channel 301. A plurality of first spray holes 303 surrounding the oxygen blowing flow channel 301 are arranged on the circular ring surface in the notch 302. The first spray holes 303 are arranged parallel to the oxygen blowing flow channel 301. A plurality of second spray holes 304 surrounding the oxygen blowing flow channel 301 are arranged on the cylindrical surface in the notch 302. The second spray holes 304 are inclined towards the central axis direction of the oxygen blowing flow channel 301. A plurality of third spray holes 305 surrounding and distributed outside the notch 302 are arranged at one end of the oxygen lance head 3 far from the connecting pipe 201. The third spray holes 305 are inclined in the direction away from the central axis of the oxygen blowing flow channel 301.

[0060] During the use of the device, according to the actual production requirements, the first spray holes 303, the second spray holes 304 and the third spray holes 305 are controlled to carry out gas spraying. The gas ejected from the first spray holes 303, the second spray holes 304 and the third spray holes 305 is a safe and stable inert gas, and the inert gas can be nitrogen. Since a plurality of first spray holes 303 are distributed around the circular ring surface inside the notch 302, a plurality of second spray holes 304 are distributed around the cylindrical surface inside the notch 302, and a plurality of third spray holes 305 are distributed around the end of the oxygen lance head 3, this makes the plurality of first spray holes 303, the plurality of second spray holes 304 and the plurality of third spray holes 305 all surround the outside of the port of the oxygen blowing flow channel 301. When the high-speed gas is ejected outward through the first spray holes 303, the second spray holes 304 and the third spray holes 305, an air flow wall can be formed to wrap the outside of the port of the oxygen blowing flow channel 301, and an isolated air flow can be formed at the end of the oxygen lance head 3, which can prevent the combustible gas existing in the furnace body 1 from flowing to the end of the oxygen lance head 3 during the oxygen blowing process, and avoid the deflagration of the combustible gas and the high-concentration oxygen at the end of the oxygen lance head 3, resulting in the burning of the oxygen lance head 3, which is beneficial to ensuring the stability of the oxygen lance head 3 during the actual use process.

[0061] During actual use, since the first nozzle hole 303 is arranged in parallel with the oxygen-blowing channel 301, the air flow wall formed by blowing through the first nozzle hole 303 presents a straight cylindrical structure. With the guidance of this air flow wall, the oxygen ejected from the oxygen-blowing channel 301 can directly shoot at the inner central position of the furnace body 1, which is convenient for ensuring the stability of the high-concentration oxygen delivery to the inner central position of the furnace body 1 during oxygen blowing. Since the second nozzle hole 304 is inclined towards the central axis direction of the oxygen-blowing channel 301, when there is no oxygen-blowing operation in the oxygen-blowing channel 301, the air flow walls formed by blowing through the second nozzle hole 304 will converge outside the port of the oxygen-blowing head 3 to form a round cover-shaped protection, which can block the port of the oxygen-blowing channel 301 and prevent the air flow and dust in the furnace body 1 from entering the oxygen-blowing channel 301 when not blowing oxygen. Through the active protection of the oxygen-blowing channel 301, it is beneficial to extend the service life of the device. Since the third nozzle hole 305 is inclined towards the direction away from the central axis of the oxygen-blowing channel 301, the air flow wall formed by blowing through the third nozzle hole 305 presents a trumpet-shaped structure. With the guidance of this air flow wall, the oxygen ejected from the oxygen-blowing channel 301 can diffuse outwards, and when it is not necessary to centrally supply oxygen to the central position of the furnace body 1, the trumpet-shaped air flow wall can be used to improve the high-efficiency and comprehensiveness of oxygen filling in the furnace body 1.

[0062] In the specific implementation process, as Figure 2 , Figure 10 and Figure 15 shown, an air flow switching mechanism is arranged in the oxygen-blowing head 3, and the air flow switching mechanism includes an annular cavity 4 arranged around the outside of the oxygen-blowing channel 301. The end wall of the annular cavity 4 close to the oxygen-blowing channel 301 is successively provided with a first interface 401, a second interface 402 and a third interface 403. The first interface 401 is communicated with the first nozzle hole 303, the second interface 402 is communicated with the second nozzle hole 304, and the third interface 403 is communicated with the third nozzle hole 305. An air flow cavity 404 is arranged outside the annular cavity 4, and a fourth interface 405 is communicated between the air flow cavity 404 and the annular cavity 4. An annular block 406 is slidably installed in the annular cavity 4, and a spring 407 is fixedly connected between the inner end wall of the annular cavity 4 and the annular block 406. A fifth interface 408 is opened on the end wall of the annular block 406 close to the first interface 401, the second interface 402 and the third interface 403, and a sixth interface 409 communicated with the fifth interface 408 is opened on the end wall of the annular block 406 close to the fourth interface 405. A first air flow channel 204 communicated with the annular cavity 4 and a second air flow channel 205 communicated with the air flow cavity 404 are opened in the end wall of the connecting pipe 201.

[0063] During the use of the device, the first interface 401, the second interface 402, the third interface 403, and the fourth interface 405 are opened on the inner end walls of the corresponding two sides inside and outside the annular cavity 4. The fifth interface 408 and the sixth interface 409 are opened on the corresponding two sides inside and outside the annular block 406. The size of the sixth interface 409 is set large enough so that when the annular block 406 slides and adjusts, the sixth interface 409 is always in communication with the fourth interface 405. The airflow that pushes the annular block 406 to move is input through the side close to the first interface 401 inside the annular cavity 4. The size of the annular block 406 is set relatively large, so that even when the fifth interface 408 is docked with the third interface 403, the annular block 406 can still complete the covering and blocking of the first interface 401.

[0064] When no airflow suction is performed under normal conditions, with the connection of the spring 407, the annular block 406 is in the middle position inside the annular cavity 4. At this time, the fifth interface 408 opened on the annular block 406 is docked with the second interface 402, and the sixth interface 409 opened on the annular block 406 is docked with the fourth interface 405. The first interface 401 is covered and blocked by the annular block 406. The airflow that enters the airflow cavity 404 enters the inside of the annular block 406 through the docking of the fourth interface 405 and the sixth interface 409, and then sprays out from the second spray hole 304 through the docking of the fifth interface 408 and the second interface 402, forming a circular hood-shaped airflow wall at the end of the oxygen blowing head 3.

[0065] When airflow is filled into the annular cavity 4, under the push of the airflow, the annular block 406 moves towards the third interface 403 and squeezes the spring 407. At this time, the fifth interface 408 opened on the annular block 406 is docked with the third interface 403, and the sixth interface 409 opened on the annular block 406 is docked 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 sprays out from the third spray hole 305 through the docking of the fifth interface 408 and the third interface 403, forming a trumpet-shaped airflow wall at the end of the oxygen blowing head 3.

[0066] When air is pumped out of the annular cavity 4, by means of the force exerted on the water inlet channel 206 by the airflow suction, the water inlet channel 206 moves towards the first interface 401 and pulls the spring 407. At this time, the fifth interface 408 opened on the annular block 406 is docked with the first interface 401, and the sixth interface 409 opened on the annular block 406 is docked with the fourth interface 405. The airflow in the airflow cavity 404 sprays out 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.

[0067] By adjusting the internal structure of the air flow switching mechanism, the air flow supply states in the first nozzle hole 303, the second nozzle hole 304, and the third nozzle hole 305 can be flexibly switched. The air flow switching mechanism is integrated in the oxygen blowing head 3, enabling the first nozzle hole 303, the second nozzle hole 304, and the third nozzle hole 305 to share a relatively large-diameter air flow channel, and using a relatively small-diameter air flow channel to control the air flow switching mechanism. Compared with preparing a relatively large-diameter air flow channel for each of the first nozzle hole 303, the second nozzle hole 304, and the third nozzle hole 305, it can effectively avoid opening a large number of relatively large-diameter air flow channels in the end wall of the connecting pipe 201, facilitating the guarantee of the stability and flexibility during the actual operation of the device.

[0068] During the specific implementation process, as Figure 2 shown, a cooling water cavity 6 is provided in the oxygen blowing head 3, and a water inlet channel 206 and a water return channel 207 communicating with the cooling water cavity 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-spiral structure and staggered in the end wall of the connecting pipe 201. During the use of the device, the cooling water enters the cooling water cavity 6 provided in the oxygen blowing head 3 through the water inlet channel 206 and is then discharged through the water return channel 207, which can effectively reduce the temperature of the oxygen blowing head 3 and prevent the oxygen blowing head 3 from being burned due to excessive temperature. By arranging the water inlet channel 206 and the water return channel 207 in a double-spiral and staggered manner in the end wall of the connecting pipe 201, when the cooling water flows in the water inlet channel 206 and the water return channel 207, the temperature of the connecting pipe 201 can also be controlled, which is beneficial to ensuring the stability of the connecting pipe 201 extending into the furnace body 1 during actual use. The double-spiral and staggered arrangement enables the cooling water to contact the connecting pipe 201 more evenly when being supplied and discharged, which is beneficial to ensuring the temperature control stability.

[0069] During the specific implementation process, as Figure 2 、 Figure 10 and Figure 11As shown in the figure, an external thread is assembled on the outer side of the lower end of the connecting pipe 201. The oxygen blowing head 3 is screwed onto the lower end of the connecting pipe 201. A first docking pipe 7 connected to the first air flow channel 204, a second docking pipe 701 connected to the second air flow channel 205, and a docking port 702 connected to the water inlet channel 206 and the water return channel 207 are arranged inside the oxygen blowing head 3. The first docking pipe 7 communicates with the annular cavity 4, the second docking pipe 701 communicates with the air flow cavity 404, and the docking port 702 communicates with the cooling water cavity 6. During the use of the device, the air flow controlling the movement of the water inlet channel 206 enters the inside of the annular cavity 4 through the docking of the first air flow channel 204 and the first docking pipe 7. The air flow input into the first spray hole 303, the second spray hole 304, and the third spray hole 305 enters the inside of the air flow cavity 404 through the docking of the second air flow channel 205 and the second docking pipe 701. The cooling water conveyed in the water inlet channel 206 enters the cooling water cavity 6 through the docking port 702 opened below, and then flows back to the water return channel 207 through the docking port 702 opened above. The oxygen blowing head 3 is installed on the outer side of the lower end of the connecting pipe 201 in a spiral connection manner. During daily maintenance, the oxygen blowing head 3 can be conveniently removed for maintenance, and can be flexibly disassembled and replaced after the oxygen blowing head 3 is damaged, which is beneficial to improving the convenience of the staff for overhauling and maintaining the device.

[0070] In the specific implementation process, as Figure 3 、 Figure 7 and Figure 8 shown, a sleeve 8 which is movably sleeved outside the connecting pipe 201 is fixedly connected to the upper end of the fixed cylinder 2, and the upper end of the sleeve 8 is bent and fixedly communicated with the inside of the furnace body 1. An oxygen supply pipe 801 which is movably inserted into the connecting pipe 201 is fixedly installed inside 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 outer end wall below the sleeve 8. Four circumferentially distributed through grooves 803 are opened on the outer end wall above the connecting pipe 201. The four through grooves 803 are all arranged parallel to the connecting pipe 201 and correspond to the four pipe joints 802 one by one. The four through grooves 803 are respectively communicated with the first air flow channel 204, the second air flow channel 205, the water inlet channel 206, and the water return channel 207.

[0071] 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 communicates with the inside of the furnace body 1. This makes the air pressure intensity at the upper end of the connecting pipe 201 the same as that at the lower end of the connecting pipe 201, which can prevent the high-temperature floating plate 5 from driving the connecting pipe 201 to move up and down under the influence of the internal and external pressure difference, and is beneficial to ensuring the stability of the device during operation. Moreover, during the sliding adjustment of the connecting pipe 201, by opening four through grooves 803 communicating with the first air flow channel 204, the second air flow channel 205, the water inlet channel 206, and the water return channel 207 on the connecting pipe 201 respectively, and fixedly installing pipe joints 802 corresponding to the through grooves 803 on the sleeve 8, the sliding of the connecting pipe 201 will not affect the supply of air flow and cooling water. At the same time, the inflow speed and outflow speed of the cooling water are the same, and the supply of the cooling water will not interfere with the sliding of the connecting pipe 201. With the mutual cooperation, the stability of the device during operation and use is further ensured.

[0072] Specifically, the working principle and operation method of the present invention are as follows:

[0073] Since the connecting pipe 201 is slidably inserted into the fixed cylinder 2 and a high-temperature floating plate 5 is installed at the lower end of the connecting pipe 201, with the support of the floating slag in the furnace body 1 on the high-temperature floating plate 5, when the height of the floating slag changes due to the increase or decrease of the molten iron, the relative position between the oxygen blowing head 3 and the molten iron remains stable. And by pre-adjusting the position of the high-temperature floating plate 5 before use, the height difference between the high-temperature floating plate 5 and the oxygen blowing head 3 can be adjusted to facilitate adapting to different production requirements. The air flow supply to the first spray hole 303, the second spray hole 304, and the third spray hole 305 is controlled by the air flow switching mechanism. The air flow ejected from the first spray hole 303 will form a cylindrical air flow wall at the end of the oxygen blowing head 3 to ensure that the oxygen in the oxygen blowing flow channel 301 can directly blow to the central position of the furnace body 1 for centralized oxygen blowing. The air flow ejected from the second spray hole 304 will form a round cover-shaped air flow wall at the end of the oxygen blowing head 3 to reduce the probability of the air flow dust in the furnace body 1 entering the oxygen blowing flow channel 301. The air flow ejected from the third spray hole 305 will form a trumpet-shaped air flow wall at the end of the oxygen blowing head 3 to ensure that the oxygen in the oxygen blowing flow channel 301 can be efficiently and comprehensively dispersed in the furnace body 1 for dispersed oxygen blowing.

[0074] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. An oxygen-blowing tuyere for a smelting reduction iron-making furnace, comprising a furnace body (1), characterized in that: 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 components include a fixed cylinder (2) fixedly inserted into the end wall of the furnace body (1), and the lower end of the fixed cylinder (2) is inclined towards the central axis of the furnace body (1). A connecting pipe (201) is slidably inserted into the fixed cylinder (2), and the lower end of the connecting pipe (201) is inside the furnace body (1). A bending structure (202) is arranged at a position near the lower end of the connecting pipe (201). An oxygen blowing head (3) is installed at the lower end of the connecting pipe (201), and an oxygen blowing channel (301) communicating with the connecting pipe (201) is throughly opened on the central axis in the oxygen blowing head (3). The oxygen blowing channel (301) points to the central position inside the furnace body (1). A high-temperature resistant floating plate (5) is installed at the connection between the connecting pipe (201) and the oxygen blowing head (3); An indentation (302) communicating with the outside of the port of the oxygen blowing channel (301) is opened at one end of the oxygen blowing head (3) away from the connecting pipe (201). A plurality of first spray holes (303) arranged around the oxygen blowing channel (301) are opened on the circular ring surface in the indentation (302). 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 opened on the cylindrical surface in the indentation (302), and the second spray holes (304) are inclined towards the central axis direction of the oxygen blowing channel (301). A plurality of third spray holes (305) distributed around the outside of the indentation (302) are opened at one end of the oxygen blowing head (3) away from the connecting pipe (201), and the third spray holes (305) are inclined in a direction away from the central axis of the oxygen blowing channel (301); An air flow switching mechanism is arranged inside the oxygen blowing head (3), and the air flow switching mechanism includes an annular cavity (4) arranged around the outer side of the oxygen blowing flow channel (301). A first interface (401), a second interface (402), and a third interface (403) are sequentially formed on the end wall of the annular cavity (4) close to the oxygen blowing flow 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 air flow cavity (404) is arranged on the outer side of the annular cavity (4), and a fourth interface (405) is communicated between the air flow cavity (404) and the annular cavity (4). An annular block (406) is slidably installed in the annular cavity (4), and a spring (407) is fixedly connected between the inner end wall of the annular cavity (4) and the annular block (406). A fifth interface (408) is formed on the end wall of the annular block (406) close to the first interface (401), the second interface (402), and the third interface (403), and a sixth interface (409) communicated with the fifth interface (408) is formed on the end wall of the annular block (406) close to the fourth interface (405). A first air flow channel (204) communicated with the annular cavity (4) and a second air flow channel (205) communicated with the air flow cavity (404) are formed in the end wall of the connecting pipe (201).

2. The oxygen-blowing tuyere of a smelting reduction iron-making furnace according to claim 1, characterized in that: A limiting block (203) is fixedly installed on the outer end wall of the connecting pipe (201), and a sliding groove adapted to the limiting block (203) is formed in the inner end wall of the fixed cylinder (2), and the sliding groove is arranged parallel to the connecting pipe (201).

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

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

5. The oxygen-blowing tuyere of a smelting reduction iron-making furnace according to claim 1, characterized in that: A cooling water cavity (6) is formed in the oxygen blowing head (3), and a water inlet channel (206) and a water return channel (207) communicated with the cooling water cavity (6) are formed in the end wall of the connecting pipe (201), and the water inlet channel (206) and the water return channel (207) are arranged in a double-spiral structure and staggered in the end wall of the connecting pipe (201).

6. The oxygen-blowing tuyere of a smelting reduction iron-making furnace according to claim 5, characterized in that: An external thread is assembled on the outer side of the lower end of the connecting pipe (201). The oxygen blowing head (3) is screwed onto the lower end of the connecting pipe (201). A first docking pipe (7) connected to the first air flow channel (204), a second docking pipe (701) connected to the second air flow channel (205), and a docking port (702) connected to the water inlet channel (206) and the water return channel (207) are arranged in the oxygen blowing head (3). The first docking pipe (7) communicates with the annular cavity (4). The second docking pipe (701) communicates with the air flow cavity (404). The docking port (702) communicates with the cooling water cavity (6).

7. The oxygen-blowing tuyere of a smelting reduction ironmaking furnace according to claim 6, characterized in that: The upper end of the fixed cylinder (2) is fixedly connected with a sleeve (8) movably sleeved on the outer side of the connecting pipe (201). The upper end of the sleeve (8) is bent and fixedly communicated with the inside of the furnace body (1). An oxygen supply pipe (801) movably inserted into 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).

8. The oxygen-blowing tuyere of a smelting reduction ironmaking furnace according to claim 7, characterized in that: Four circumferentially distributed pipe joints (802) are fixedly installed on the outer end wall below the sleeve (8). Four circumferentially distributed through grooves (803) are formed in the outer end wall above the connecting pipe (201). The four through grooves (803) are all arranged parallel to the connecting pipe (201) and correspond to the four pipe joints (802) one by one. The four through grooves (803) are respectively communicated with the first air flow channel (204), the second air flow channel (205), the water inlet channel (206) and the water return channel (207).

Images