A segmented consumable oxygen lance and an on-line replacement device thereof

Abstract

The application discloses a segmented self-consumption oxygen lance and an online replacement device thereof, and belongs to the technical field of oxygen lances. The segmented self-consumption oxygen lance comprises a furnace body, a furnace wall, a piston, a hydraulic propulsion mechanism and a segmented self-consumption oxygen lance. The furnace body is provided with the furnace wall on the outer wall. The segmented self-consumption oxygen lance comprises N oxygen lance heads and an oxygen lance base which are connected in sequence along the axial direction from front to back. The first N-1 oxygen lance heads are composed of an oxygen lance head section and a low-melting-point alloy section. The last oxygen lance head is composed of an oxygen lance head section. The bottom of the last oxygen lance head is fixed on the oxygen lance base. One end of the piston is connected with the hydraulic propulsion mechanism. The other end of the piston is provided with a piston rod. The furnace body and the furnace wall are provided with oxygen lance holes through which the oxygen lance heads pass. The oxygen lance heads pass through the oxygen lance holes, penetrate the furnace wall and are inserted into the furnace body. The oxygen lance wall is coated with refractory material at the contact position with the furnace wall to realize sealing. The oxygen lance head in the application forms a structure of'multi-section series connection and step-by-step consumption'. The application not only saves cost, but also can be remotely operated throughout the process, reduces the participation of personnel and reduces the labor intensity.

Description

Technical Field

[0001] This invention relates to the field of non-ferrous metal smelting technology, specifically to a segmented consumable oxygen lance and its online replacement device for oxygen-enriched bottom-blown furnaces, top-blown furnaces, or side-blown furnaces. Background Technology

[0002] Oxygen-enriched bottom-blown furnaces are core equipment in the smelting of non-ferrous metals such as copper and lead. During production, multiple oxygen lances are inserted into the molten pool from the bottom of the furnace, injecting oxygen-enriched air into the high-temperature melt (1200-1350℃) through the lances to complete the intensified smelting reaction. Oxygen lances are typically made of copper alloy and internally circulate cooling compressed air and oxygen to withstand extreme temperatures. It should be noted that the aforementioned oxygen lance clogging problem is not limited to bottom-blown furnaces; it is also common in top-blown smelting furnaces (such as ISA and Ausmelt furnaces, where the oxygen lance is inserted vertically from the top of the furnace) and side-blown smelting furnaces (where the oxygen lance is inserted horizontally or obliquely from the side of the furnace). These furnace types face the same clogging problem during operation, and maintenance also requires stopping the furnace and removing the entire oxygen lance, which is time-consuming and labor-intensive. Therefore, the following explanation uses a bottom-blown furnace as an example, but the technical solution of this invention is also applicable to top-blown and side-blown furnaces.

[0003] In actual operation, regardless of the insertion method, the head of the oxygen lance will gradually be covered and clogged with high-melting-point substances in the molten metal (such as magnetite, copper matte, etc.), forming a "mushroom head" shaped blockage. After about a week of operation, the blockage worsens, leading to a drop in oxygen pressure and a deterioration in the blowing effect. It is necessary to shut down the furnace and switch to a converter (to remove the oxygen lance from the molten metal surface), then pull the entire oxygen lance (about 100-150cm in length) out of the oxygen lance hole in the furnace body, clean or replace the lance head, and then reinstall it. The entire maintenance process usually takes more than 4 hours, and the removal and installation of the oxygen lance relies entirely on manual knocking and mechanical assistance, which is extremely labor-intensive and poses safety hazards in confined spaces.

[0004] In summary, the existing oxygen lance replacement technology has the following shortcomings: it requires shutting down the furnace and converter, resulting in long maintenance time (more than 4 hours) and affecting production capacity; the oxygen lance is pulled out as a whole for replacement, resulting in serious material waste; manual knocking and insertion is labor-intensive and poses safety hazards in confined spaces; and there is a lack of automated means for rapid processing.

[0005] Therefore, how to achieve rapid online treatment of oxygen lance blockage, reduce converter maintenance time, and reduce manual labor intensity are urgent problems to be solved in this field. Summary of the Invention

[0006] In view of this, the present invention aims to provide a segmented self-consuming oxygen lance and its online replacement device, to solve the technical problems of existing oxygen-enriched bottom blowing furnaces where the oxygen lance must be completely pulled out and replaced after blockage, resulting in long maintenance time, high labor intensity, and safety hazards.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A segmented self-consuming oxygen lance and its online replacement device are disclosed, comprising a furnace body, a furnace wall, a piston, a hydraulic propulsion mechanism, and a segmented self-consuming oxygen lance. The furnace body has a furnace wall. The segmented self-consuming oxygen lance includes N oxygen lance heads and oxygen lance bases connected sequentially from front to back along the axial direction. The first N-1 oxygen lance heads are composed of oxygen lance head sections and low-melting-point alloy sections, and the last oxygen lance head is composed of oxygen lance head sections, with the bottom of the last oxygen lance head fixed to the oxygen lance base. One end of the piston is connected to the hydraulic propulsion mechanism, and the other end of the piston is provided with a piston rod, which is connected to the oxygen lance base. The furnace body and furnace wall are provided with oxygen lance holes through which the oxygen lance heads pass. The oxygen lance heads penetrate the furnace wall through the oxygen lance holes and are inserted into the furnace body to inject oxygen and / or compressed air. The contact area between the oxygen lance wall and the furnace wall is coated with refractory material to achieve sealing. Here, N is an integer, and N≥2.

[0008] Furthermore, the oxygen lance head is provided with a compressed air delivery channel and an oxygen delivery channel. The compressed air delivery channels in the front and rear oxygen lance heads are the same size and are axially corresponding, thus forming an axial compressed air delivery channel inside the entire segmented consumable oxygen lance. The oxygen delivery channels in the front and rear oxygen lance heads are the same size and are axially corresponding, thus forming an axial oxygen delivery channel inside the entire segmented consumable oxygen lance. The oxygen lance base is provided with a compressed air inlet and an oxygen inlet respectively corresponding to the compressed air delivery channel and the oxygen delivery channel.

[0009] Furthermore, the hydraulic propulsion mechanism consists of an A oil pipe, a hydraulic station, a B oil pipe, and an oil cylinder. The piston is located inside the oil cylinder, and the piston rod extends out of the oil cylinder and is connected to the oxygen lance base. One end of the A oil pipe and the B oil pipe are respectively connected to the hydraulic station, and the other end of the A oil pipe and the B oil pipe are respectively connected to the top and bottom of the oil cylinder.

[0010] Furthermore, the oxygen lance head section and the low-melting-point alloy section have the same diameter, and the oxygen lance head section and the low-melting-point alloy section are integrally formed.

[0011] Furthermore, the piston rod head is provided with a flange, and the outer edge of the flange is provided with a first threaded hole. The outer edge of the oxygen lance base is provided with a second threaded hole corresponding to the first threaded hole. The oxygen lance base and the flange are connected by a screw and a nut.

[0012] The oxygen lance head in this invention forms a "multi-segment series, step-by-step consumption" structure. The low-melting-point alloy segment is made of a low-melting-point alloy material, which remains solid at room temperature and the normal operating temperature of the oxygen lance. Its melting point is between 400-850℃, significantly lower than the furnace melt temperature (1200-1350℃), but higher than the temperature of the oxygen lance body during normal operation (approximately 100-300℃). When the oxygen lance head becomes blocked, the oxygen pressure increases. At this time, as shown in the figure, the hydraulic station controls the oil supply to the lower part of the piston through oil pipe B, while the oil in the upper part of the piston flows through oil pipe A. The flow returns to the hydraulic station, the piston rod extends, and pushes the entire oxygen lance forward into the furnace by a distance equal to the length of one lance head section plus one low-melting-point alloy section (usually 10-20 cm). This allows the currently blocked oxygen lance head section and its adjacent low-melting-point alloy section to enter the high-temperature melting zone of the furnace. At this time, the supply of compressed air and oxygen is appropriately reduced to decrease the intensity of the molten pool agitation. Relying on the heat of the melt itself (1200-1350℃), the first low-melting-point alloy section melts rapidly, the currently blocked oxygen lance head section falls off, and the next prefabricated oxygen lance head section is naturally exposed, becoming the new working lance head. When the oxygen lance is no longer in use and needs to be replaced as a whole (i.e., all prefabricated lance head sections have been consumed), after the converter removes the oxygen lance from the molten surface, the hydraulic station controls the hydraulic station to send pressurized oil into the upper chamber of the piston through oil pipe A. The return oil from the lower chamber of the piston flows back to the hydraulic station through oil pipe B. The piston rod retracts, pulling the entire oxygen lance out of the furnace body. Then, the connecting flange is opened for replacement. The entire process can be operated remotely, reducing human involvement and minimizing manual labor intensity. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the segmented consumable oxygen lance structure of the present invention; Figure 3 yes Figure 1 Enlarged view of part A in the image. Detailed Implementation

[0014] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited thereto.

[0015] A segmented consumable oxygen lance and its online replacement device, such as Figures 1 to 3 As shown, it includes furnace body 1, furnace wall 2, A oil pipe 4, hydraulic station 5, B oil pipe 6, piston 7, piston rod 8, and segmented consumable oxygen lance.

[0016] The furnace body 1 has a furnace wall 2 on its outer wall. The segmented consumable oxygen lance includes N oxygen lance heads 10 and oxygen lance bases 14 connected sequentially from front to back along the axial direction (N is generally an integer from 2 to 5, i.e., N is 2, 3, 4, 5). The first N-1 oxygen lance heads 10 are composed of an oxygen lance head section and a low melting point alloy section 9. The last oxygen lance head 10 is composed of an oxygen lance head section, and the bottom of the last oxygen lance head is fixed on the oxygen lance base 14. One end of the piston 7 is connected to the hydraulic propulsion mechanism, and the other end of the piston 7 is provided with a piston rod 8. The piston rod 8 is connected to the oxygen lance base 14. The furnace body 1 and the furnace wall 2 are provided with oxygen lance holes through which the oxygen lance heads 10 pass. The oxygen lance heads 10 penetrate the furnace wall 2 through the oxygen lance holes and are inserted into the interior of the furnace body 1 to spray oxygen and / or compressed air. The contact point between the oxygen lance wall 11 and the furnace wall 2 is coated with refractory material to achieve sealing.

[0017] The oxygen lance head 10 has a compressed air delivery channel 12 and an oxygen delivery channel 13. The compressed air delivery channels 12 in the front and rear oxygen lance heads 10 are of the same size and are axially aligned, thus forming an axial compressed air delivery channel inside the entire segmented consumable oxygen lance. The oxygen delivery channels 13 in the front and rear oxygen lance heads 10 are of the same size and are axially aligned, thus forming an axial oxygen delivery channel inside the entire segmented consumable oxygen lance. The oxygen lance base 14 has a compressed air inlet and an oxygen inlet corresponding to the compressed air delivery channels 12 and 13, respectively. In use, the compressed air inlet and the oxygen inlet are connected to the compressed air metal hose 17 and the oxygen metal hose 18, respectively. The oxygen lance head section and the low-melting-point alloy section 9 are integrally formed.

[0018] The hydraulic propulsion mechanism consists of an A-pipe 4, a hydraulic station 5, a B-pipe 6, and a cylinder. A piston 7 is located inside the cylinder, and a piston rod 8 extends out of the cylinder with a flange 3 at its head. A first threaded hole is located on the outer circumference of the flange 3, and a second threaded hole is located on the outer circumference of the oxygen lance base 14 corresponding to the first threaded hole. The oxygen lance base 14 and the flange 3 are connected by a screw 15 and a nut 16. One end of the A-pipe 4 and the B-pipe 6 are connected to the hydraulic station, and the other ends are connected to the top and bottom of the cylinder, respectively.

[0019] The furnace body 1 serves as the ore powder smelting reaction zone, and the furnace wall 2 is the area where the furnace body 1 contacts the outside world.

[0020] The oxygen lance head 10 penetrates the furnace wall 2 and is inserted into the furnace body 1 to spray oxygen and / or compressed air to participate in the reaction. The oxygen lance wall 11 is coated with refractory material and contacts the furnace wall 2 to achieve a seal. When the oxygen lance head 10 at the very front penetrates the furnace wall 2 and enters the furnace body 1, the remaining part of the oxygen lance head temporarily serves as the lance body.

[0021] The oxygen lance head 10 is a nozzle made of 316 stainless steel and is located at the very front of the oxygen lance. The low-melting-point alloy segment 9 remains solid at room temperature and the normal operating temperature of the oxygen lance. Its melting point is between 400-850℃, which is significantly lower than the temperature of the melt in the furnace (1200-1350℃), but higher than the temperature of the lance body when the oxygen lance is operating normally (about 100-300℃). Specifically, it can be made of A356 aluminum alloy or low-melting-point copper alloy (a new low-melting-point die-casting copper alloy, Xie Kui, Mechanical Workers Technical Data, 1974, page 48), etc.

[0022] When the oxygen lance head 10 becomes clogged, at this time... Figure 1 The hydraulic station 5, as shown, pressurizes oil into the lower part of piston 7 through oil pipe B 6. The oil in the upper part of piston 7 flows back to hydraulic station 5 through oil pipe A 4. Piston rod 8 extends, pushing the entire oxygen lance forward into the furnace 1 by the distance of one oxygen lance head section plus one low melting point alloy section 9 (usually 10-20cm). This allows the currently blocked oxygen lance head section and its adjacent low melting point alloy section 9 to enter the high-temperature melting zone of furnace 1. At this time, the amount of compressed air and oxygen supplied is appropriately reduced to decrease the intensity of molten pool agitation. Relying on the heat of the melt itself (1200-1350℃), the melting point alloy section 9 entering the furnace 1 melts rapidly. The currently blocked oxygen lance head section falls off, and the next prefabricated oxygen lance head section is naturally exposed, becoming a new working lance head.

[0023] When the oxygen lance is used up and needs to be replaced as a whole (i.e., all prefabricated lance head sections have been consumed), the converter removes the oxygen lance from the molten metal surface. The control hydraulic station 5 sends pressurized oil into the upper chamber of the piston through oil pipe A 4. The return oil from the lower chamber of the piston flows back to the hydraulic station 5 through oil pipe B 6. The piston rod retracts, and the remaining part of the oxygen lance is pulled out of the furnace body. Then, the connecting flange 3 is opened for replacement.

[0024] When the oxygen lance is bottom-blown, and it is necessary to push the entire oxygen lance in the direction of furnace 1, for safety reasons, after stopping the converter, disconnect the compressed air metal hose 17 and the oxygen metal hose 18, and then fix the oxygen lance base 14 and flange 3 with nuts 16 and bolts 15. Control the hydraulic station 5 to press oil into the lower part of piston 7 through oil pipe B 6, and the oil in the upper part of piston 7 flows back to hydraulic station 5 through oil pipe A 4. The piston rod 8 extends, pushing the entire oxygen lance in the direction of furnace 1 a distance equal to the oxygen lance head section plus a low melting point alloy section 9. Then, disconnect the oxygen lance base 14 and flange 3, and install the compressed air metal hose 17 and the oxygen metal hose 18. The oxygen lance will then work normally.

[0025] When the oxygen lance is side-blown or top-blown, during production, the compressed air metal hose 17 and the oxygen metal hose 18 are always connected to the oxygen lance base 14, and the oxygen lance base 14 and the flange 3 are always connected. By controlling the distance between the bolts 15 and the nuts 16, the oxygen lance head 10 can be pushed directly into the furnace body 1 without stopping the machine, thus reducing the frequency of shutdowns.

[0026] The above process can be operated remotely throughout, reducing human involvement and lowering the intensity of manual labor.

[0027] Currently, when the oxygen lance head is clogged and needs to be replaced, it takes 4-5 hours to shut down for replacement. With this application, the oxygen lance head can be directly pushed into the furnace body 1 when it needs to be replaced, reducing the shutdown time to 2 hours, which greatly shortens the shutdown time and improves production efficiency.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the specific implementation of the present invention and not to limit it. Those skilled in the art should understand that any equivalent substitutions or obvious modifications made to the implementation of the present invention without changing its performance or use, without departing from the spirit of the present invention, should be covered within the scope of protection claimed by the present invention.

Claims

1. A segmented consumable oxygen lance and its online replacement device, characterized in that, The furnace includes a furnace body, furnace wall, piston, hydraulic propulsion mechanism, and segmented consumable oxygen lance. The furnace body has a furnace wall. The segmented consumable oxygen lance includes N oxygen lance heads and oxygen lance bases connected sequentially from front to back along the axial direction. The first N-1 oxygen lance heads are composed of oxygen lance head sections and low-melting-point alloy sections. The last oxygen lance head is composed of oxygen lance head sections, and the bottom of the last oxygen lance head is fixed to the oxygen lance base. One end of the piston is connected to the hydraulic propulsion mechanism, and the other end of the piston is provided with a piston rod, which is connected to the oxygen lance base. The furnace body and furnace wall are provided with oxygen lance holes for the oxygen lance heads to pass through. The oxygen lance heads penetrate the furnace wall through the oxygen lance holes and are inserted into the furnace body to spray oxygen and / or compressed air. The contact area between the oxygen lance wall and the furnace wall is coated with refractory material to achieve sealing. Here, N is an integer, and N≥2.

2. The segmented consumable oxygen lance and its online replacement device according to claim 1, characterized in that, The oxygen lance head is equipped with a compressed air delivery channel and an oxygen delivery channel. The compressed air delivery channels in the front and rear oxygen lance heads are the same size and are axially aligned, thus forming an axial compressed air delivery channel inside the entire segmented consumable oxygen lance. The oxygen delivery channels in the front and rear oxygen lance heads are the same size and are axially aligned, thus forming an axial oxygen delivery channel inside the entire segmented consumable oxygen lance. The oxygen lance base is equipped with a compressed air inlet and an oxygen inlet respectively, corresponding to the compressed air delivery channel and the oxygen delivery channel.

3. The segmented consumable oxygen lance and its online replacement device according to claim 1, characterized in that, The hydraulic propulsion mechanism consists of an A oil pipe, a hydraulic station, a B oil pipe, and an oil cylinder. The piston is located inside the oil cylinder, and the piston rod extends out of the oil cylinder and is connected to the oxygen lance base. One end of the A oil pipe and the B oil pipe are connected to the hydraulic station, and the other end of the A oil pipe and the B oil pipe are connected to the top and bottom of the oil cylinder, respectively.

4. The segmented consumable oxygen lance and its online replacement device according to claim 1 or 2, characterized in that, The oxygen lance head section and the low-melting-point alloy section have the same diameter and are integrally formed.

5. The segmented consumable oxygen lance and its online replacement device according to claim 1, characterized in that, The piston rod head is provided with a flange, and the outer edge of the flange is provided with a first threaded hole. The outer edge of the oxygen lance base is provided with a second threaded hole corresponding to the first threaded hole. The oxygen lance base and the flange are connected by a screw and a nut.

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