A steelmaking electric furnace dust treatment device

Abstract

This invention relates to the field of electric arc furnace technology for steelmaking, and discloses a dust treatment device for electric arc furnaces, comprising a liquid atomizing generator, a compressed air generator, and a ceramic support. The output end of the liquid atomizing generator is connected to a water pipe for conveying the water mist generated by the liquid atomizing generator. One end of the water pipe is connected to an atomizing spray ring with a hollow interior. The output end of the compressed air generator is connected to a compressed air pipe for conveying the compressed air generated by the compressed air generator. This invention suppresses the leakage of dust-laden flue gas from the electrode holes by setting an air curtain and a mist layer at the electrode holes, improving the furnace environment. It also effectively cools the electrodes, reduces electrode consumption, lowers the failure rate of smelting equipment, reduces production costs, effectively improves the suppression effect of dust-laden flue gas, prevents leakage of dust-laden flue gas, and enhances the cooling effect on the electrodes.

Description

Technical Field

[0001] This invention relates to the field of electric arc furnaces for steelmaking, and more specifically, to a device for treating flue gas from electric arc furnaces for steelmaking. Background Technology

[0002] In electric arc furnaces or submerged arc furnaces used for steelmaking, a certain gap exists between the electrode holes on the furnace cover and the electrodes located inside, to facilitate the electrodes passing through the furnace cover and moving up and down. During the electric arc furnace steelmaking process, the gas inside the furnace expands rapidly after reaching high temperatures and losing pressure. The fourth hole cannot completely absorb the expanded dust-laden flue gas, especially during the oxygen blowing stage, when the dust production is even greater. Excess flue gas is injected into the surrounding environment from the gap between the electrode holes on the top of the furnace cover and the electrodes. Even if the furnace is completely sealed and equipped with dust removal facilities, a certain proportion of dust still accumulates after entering the furnace, affecting equipment and personnel safety. This phenomenon is more pronounced in ordinary electric arc furnace enterprises without furnaces and is a major source of dust concentration in the workshop. At the same time, the traditional electrode spray ring is installed near the electrode holder, which significantly reduces the cooling effect at the furnace cover position. Summary of the Invention

[0003] This invention provides a dust treatment device for electric arc furnaces in steelmaking, which solves the technical problem in related technologies where, during the electric arc furnace steelmaking process, the gas inside the furnace expands rapidly after high temperature and pressure loss, and the fourth hole cannot completely absorb the expanded dust-laden flue gas. Especially during the oxygen blowing stage, the dust production is even greater, and excessive flue gas is sprayed into the surrounding environment from the electrode holes on the top of the furnace cover and the gap between the electrodes. The traditional electrode spray ring is installed near the electrode holder, which significantly reduces the cooling effect at the furnace cover position.

[0004] This invention provides a steelmaking electric furnace dust treatment device, including a liquid atomizing generator, a compressed air generator, and a ceramic bracket. The output end of the liquid atomizing generator is connected to a water pipe for conveying the water mist generated by the liquid atomizing generator. One end of the water pipe is connected to an atomizing spray ring with an internally hollow structure. The output end of the compressed air generator is connected to a compressed air pipe for conveying the compressed air generated by the compressed air generator. One end of the compressed air pipe is connected to an air curtain ring with an internally hollow structure. Flow regulating valves and differential pressure transmitters are fixedly installed on both the water pipe and the compressed air pipe.

[0005] The central axes of the atomizing spray ring and the air curtain ring are both collinear with the central axis of the electrode. The outer surfaces of the atomizing spray ring and the air curtain ring are fixedly connected to the ceramic bracket, and the outer surfaces of the ceramic bracket are fixedly connected to the top cover of the electric furnace.

[0006] The atomizing spray ring has multiple A-type spray holes arranged in a circular array with its central axis as the center.

[0007] The air curtain ring has multiple B-type nozzles arranged in a circular array around its central axis.

[0008] Both nozzles A and B have one end angled downwards toward the bottom of the electrode.

[0009] Furthermore, the liquid atomizing generator, the compressed air generator, and the flow regulating valve are connected to a controller, which is used to control the power of the liquid atomizing generator and the compressed air generator, as well as the opening degree of the flow regulating valve.

[0010] Furthermore, it also includes A guide vane, B guide vane, A drive component, and B drive component;

[0011] The A guide vane is slidably connected to the inner wall of the A nozzle on both sides. The A guide vane can move to the first position and the second position along the direction of water mist movement. The A guide vane is connected to the A drive component that drives its movement. The A guide vane divides the A nozzle into the A channel and the B channel.

[0012] When guide vane A moves to the first position, guide vane A blocks flow channel A, and flow channel B is in the open state; when guide vane A moves to the second position, both flow channel A and flow channel B are in the open state.

[0013] The B guide vane is slidably connected to the inner wall of the B nozzle on both sides. The B guide vane can move to the first position and the second position along the direction of water mist movement. The B guide vane is connected to the B drive component that drives its movement. The B guide vane divides the B nozzle into the C channel and the D channel.

[0014] When guide vane B moves to the first position, it blocks flow channel C and opens flow channel D; when guide vane B moves to the second position, both flow channels C and D are open.

[0015] Furthermore, the A drive component includes an A turntable rotatably mounted on the atomizing spray ring, two A inclined grooves are formed on the A turntable, A guide posts are slidably connected to the inner wall of the A inclined grooves, one end of the A guide post is fixedly connected to the A guide vane, and the A turntable is connected to an A drive mechanism that drives it to rotate around its central axis.

[0016] Furthermore, the A drive mechanism includes an A arc-shaped rack fixedly installed outside the A turntable, an A rack meshing on one side of the A arc-shaped rack, an A support frame that can move axially along the ceramic bracket, and an A telescopic drive member that drives its movement.

[0017] Furthermore, the B drive component includes a B turntable rotatably mounted on the air curtain ring, a B inclined groove is provided on the B turntable, a B guide post is slidably connected to the B inclined groove, one end of the B guide post is fixedly connected to the B guide vane, and the B turntable is connected to a B drive mechanism that drives it to rotate around its central axis.

[0018] Furthermore, the B drive mechanism includes a B arc-shaped rack fixedly installed outside the B turntable, a B rack meshing on one side of the B arc-shaped rack, a B support frame that can move axially along the ceramic bracket, and a B telescopic drive member that drives its movement.

[0019] Furthermore, an inclined platform is provided at the outlet end of the A guide vane near the A flow channel.

[0020] Furthermore, a ramp is provided at the outlet end of the B guide vane near the B flow channel.

[0021] Furthermore, elastic rubber pads are provided on the surfaces of the bosses on both the A and B guide vanes.

[0022] The beneficial effects of this invention are as follows: by setting an air curtain and an aerosol layer at the electrode hole, the dust-laden flue gas in the electric furnace is suppressed from being ejected and overflowing from the electrode hole, the environment inside the furnace is improved, and the electrode can be effectively cooled, reducing electrode consumption, reducing the failure rate of smelting equipment, and reducing production costs.

[0023] By setting up A and B guide vanes, the formed air curtain and mist layer have two layers, which effectively improves the suppression effect on dust-laden flue gas, prevents the leakage of dust-laden flue gas, and improves the cooling effect on the electrodes. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0025] Figure 2 This is a cross-sectional structural diagram provided in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the combination of the atomizing spray ring, water pipe, flow regulating valve, differential pressure transmitter, A support frame, A rack and pinion, and A telescopic drive component provided in the embodiments of the present invention;

[0027] Figure 4 This is a schematic diagram of the combination of the air curtain ring, compressed air pipe, flow regulating valve, differential pressure transmitter, B support frame, B rack and pinion and B telescopic drive component provided in the embodiment of the present invention;

[0028] Figure 5 This is provided by an embodiment of the present invention. Figure 2 Enlarged structural diagram at point A in the diagram;

[0029] Figure 6 This is a schematic diagram of the combination of the atomizing spray ring, A support frame, A rack, A arc rack, A turntable and A guide vane provided in the embodiment of the present invention;

[0030] Figure 7This is a schematic diagram of the combination of air curtain ring, B support frame, B rack, B arc rack, B turntable and B guide vane provided in the embodiment of the present invention;

[0031] Figure 8 This is an exploded structural diagram of the atomizing spray ring, spray hole A, arc-shaped rack A, turntable A, inclined groove A, guide post A, and guide vane A provided in the embodiments of the present invention;

[0032] Figure 9 This is an exploded structural diagram of the air curtain ring, B nozzle, B arc rack, B turntable, B inclined groove, B guide post and B guide vane provided in the embodiments of the present invention;

[0033] Figure 10 This is a schematic diagram of the combination of the A-arc rack, A-turntable, A-sloping groove, A-guide post and A-guide vane provided in the embodiment of the present invention;

[0034] Figure 11 This is a schematic diagram of the combination of the B arc-shaped rack, B turntable, B inclined groove, B guide post and B guide vane provided in the embodiment of the present invention.

[0035] In the diagram: 1. Ceramic bracket; 2. Water pipe; 3. Atomizing spray ring; 4. Compressed air pipe; 5. Air curtain ring; 6. Flow regulating valve; 7. Differential pressure transmitter; 8. A nozzle; 9. B nozzle; 10. A guide vane; 11. B guide vane; 12. A drive component; 121. A turntable; 122. A inclined groove; 123. A guide post; 124. A drive mechanism; 1241. A arc-shaped rack; 1242. A rack; 1243. A support frame; 1244. A telescopic drive component; 13. B drive component; 131. B turntable; 132. B inclined groove; 133. B guide post; 134. B drive mechanism; 1341. B arc-shaped rack; 1342. B rack; 1343. B support frame; 1344. B telescopic drive component. Detailed Implementation

[0036] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0037] like Figures 1-11As shown, a steelmaking electric furnace dust treatment device includes a liquid atomizing generator, a compressed air generator, and a ceramic bracket 1. The output end of the liquid atomizing generator is connected to a water pipe 2 for conveying the water mist generated by the liquid atomizing generator. One end of the water pipe 2 is connected to an atomizing spray ring 3 with a hollow interior. The output end of the compressed air generator is connected to a compressed air pipe 4 for conveying the compressed air generated by the compressed air generator. One end of the compressed air pipe 4 is connected to an air curtain ring 5 with a hollow interior. A flow regulating valve 6 and a differential pressure transmitter 7 are fixedly installed on both the water pipe 2 and the compressed air pipe 4.

[0038] The central axes of the atomizing spray ring 3 and the air curtain ring 5 are collinear with the centerline of the electrode. The outer surfaces of the atomizing spray ring 3 and the air curtain ring 5 are fixedly connected to the ceramic bracket 1. The outer surface of the ceramic bracket 1 is fixedly connected to the top cover of the electric furnace.

[0039] The atomizing spray ring 3 has multiple A spray holes 8 arranged in a circular array with its central axis as the center;

[0040] Multiple B-type nozzles 9 are arranged in a circular array with their central axis as the center on the air curtain ring 5;

[0041] One end of nozzle A 8 and nozzle B 9 are both angled downwards toward the bottom of the electrode.

[0042] In one embodiment of the present invention, the liquid atomizing generator, the compressed air generator, and the flow regulating valve 6 are connected to a controller, which is used to control the power of the liquid atomizing generator and the compressed air generator and the opening degree of the flow regulating valve 6.

[0043] After the electric furnace starts smelting, less flue gas overflows from the electrode holes of the furnace cover. At this time, the controller controls the liquid atomizer and compressed air generator to a low power state, maintaining the lowest intensity of compressed air and mist layer output, and the mist layer density is low.

[0044] After the oxygen blowing begins, the oxygen flow rate in the oxygen lance increases sharply. The controller controls the power of the liquid atomizer and compressed air generator to increase, and controls the opening of the flow regulating valve 6 to enhance the strength of the air curtain and the density of the atomized layer, until the flue gas flow in the electrode hole is completely sealed inside the electric furnace.

[0045] When the furnace cover is opened, the controller shuts down the flow regulating valve 6, the liquid atomizing generator, the compressed air generator, and the differential pressure transmitter 7.

[0046] In one embodiment of the present invention, it further includes an A guide vane 10, a B guide vane 11, an A drive member 12, and a B drive member 13;

[0047] The A guide vane 10 is slidably connected to the inner wall of the A nozzle 8 on both sides. The A guide vane 10 can move to the first position and the second position along the direction of water mist movement. The A guide vane 10 is connected to the A drive member 12 that drives its movement. The A guide vane 10 divides the A nozzle 8 into the A flow channel and the B flow channel.

[0048] When the A guide vane 10 moves to the first position, the A guide vane 10 blocks the A flow channel and the B flow channel is open; when the A guide vane 10 moves to the second position, both the A flow channel and the B flow channel are open.

[0049] The B guide vane 11 is slidably connected to the inner wall of the B nozzle 9 on both sides. The B guide vane 11 can move to the first position and the second position along the direction of water mist movement. The B guide vane 11 is connected to the B drive member 13 that drives its movement. The B guide vane 11 divides the B nozzle 9 into the C channel and the D channel.

[0050] When the B guide vane 11 moves to the first position, the B guide vane 11 blocks the C flow channel and the D flow channel is open; when the B guide vane 11 moves to the second position, both the C and D flow channels are open.

[0051] In one embodiment of the present invention, a ramp is provided at the outlet end of the A guide vane 10 near the A flow channel;

[0052] The direction of the aerosol spray is changed by setting up a ramp;

[0053] In one embodiment of the present invention, a ramp is provided at the outlet end of the B guide vane 11 near the B flow channel;

[0054] The direction of compressed gas ejection is changed by setting up a ramp.

[0055] In one embodiment of the present invention, the A drive member 12 includes an A turntable 121 rotatably mounted on the atomizing spray ring 3. Two A inclined grooves 122 are formed on the A turntable 121. An A guide post 123 is slidably connected to the inner wall of the A inclined groove 122. One end of the A guide post 123 is fixedly connected to the A guide plate 10. The A turntable 121 is connected to an A drive mechanism 124 that drives it to rotate around its central axis.

[0056] In one embodiment of the present invention, the A drive mechanism 124 includes an A arc-shaped rack 1241 fixedly installed outside the A turntable 121, an A rack 1242 meshing on one side of the A arc-shaped rack 1241, an A support frame 1243 that can move along the axial direction of the ceramic bracket 1, and an A telescopic drive member 1244 that drives the movement of the A support frame 1243.

[0057] In one embodiment of the present invention, the A telescopic drive member 1244 is a cylinder or a hydraulic cylinder, the output end of the A telescopic drive member 1244 is fixedly connected to the A support frame 1243, and the fixed end of the A telescopic drive member 1244 is fixedly connected to the top cover of the electric furnace.

[0058] In one embodiment of the present invention, the A drive mechanism 124 is a cylinder or a hydraulic cylinder, the output end of the A drive mechanism 124 is fixedly connected to the A guide vane 10, and the fixed end of the A drive mechanism 124 is fixedly connected to the ceramic bracket 1.

[0059] In one embodiment of the present invention, the B drive component 13 includes a B turntable 131 rotatably mounted on the air curtain ring 5, a B inclined groove 132 is provided on the B turntable 131, a B guide post 133 is slidably connected to the B inclined groove 132, one end of the B guide post 133 is fixedly connected to the B guide vane 11, and the B turntable 131 is connected to a B drive mechanism 134 that drives it to rotate around its central axis.

[0060] In one embodiment of the present invention, the B drive mechanism 134 includes a B arc-shaped rack 1341 fixedly installed outside the B turntable 131, a B rack 1342 meshing on one side of the B arc-shaped rack 1341, the B rack 1342 being connected to a B support frame 1343 that can move along the axial direction of the ceramic bracket 1, and the B support frame 1343 being connected to a B telescopic drive member 1344 that drives its movement.

[0061] In one embodiment of the present invention, the B telescopic drive component 1344 is a cylinder or a hydraulic cylinder, the output end of the B telescopic drive component 1344 is fixedly connected to the B support frame 1343, and the fixed end of the B telescopic drive component 1344 is fixedly connected to the top cover of the electric furnace.

[0062] In one embodiment of the present invention, the B drive mechanism 134 is a cylinder or a hydraulic cylinder, the output end of the B drive mechanism 134 is fixedly connected to the B guide vane 11, and the fixed end of the B drive mechanism 134 is fixedly connected to the ceramic bracket 1.

[0063] In one embodiment of the present invention, elastic rubber pads are provided on the surfaces of the bosses on both the A guide vane 10 and the B guide vane 11.

[0064] When the A guide vane 10 is in the first position, the elastic pad on the A guide vane 10 is pressed against the inner wall of the A flow channel, completely sealing the A flow channel.

[0065] When the B guide vane 11 is in the first position, the elastic pad on the B guide vane 11 is pressed against the inner wall of the B flow channel, completely sealing the B flow channel.

[0066] During operation, when an increase in pressure is detected inside the electric arc furnace, the controller further increases the power of the liquid atomizing generator and compressed air generator, widens the opening of the flow regulating valve 6, and enhances the air curtain intensity and atomization layer density. This activates the A telescopic drive 1244 and B telescopic drive 1344, causing their output ends to retract. The A support frame 1243 moves upward, driving the A rack 1242 upward. The A rack 1242, through the A arc-shaped rack 1241, drives the A turntable 121 to rotate. As the A turntable 121 rotates, the inner wall of the A inclined groove 122 presses against and pushes the A guide column. Because the A guide vane 10 is slidably connected to the inner wall of the A nozzle 8 on both sides, the A guide vane 10 is limited. Thus, the A guide vane 10 moves towards the outlet direction of the A nozzle 8. A B flow channel is formed between the side of the A guide vane 10 with the A nozzle 8 and the inclined platform. At this time, the A guide vane 10 is in the first position. The other side of the A guide vane 10 forms the A flow channel with the A nozzle 8. Water mist is sprayed out from the A flow channel and the B flow channel at the same time. At the same time, under the action of the inclined platform on the A guide vane 10, the spray direction of the water mist deviates at a certain angle. The aerosol layers formed by the water mist sprayed from the A flow channel and the B flow channel have a certain distance between them, which improves the suppression effect of the aerosol layer on the dust-laden flue gas. Similarly, compressed air is sprayed out from the C flow channel and the D flow channel at the same time. Due to the increase in the amount of water mist and compressed air, there are two aerosol layers at this time, which effectively improves the suppression of dust-laden flue gas and avoids the leakage of dust-laden flue gas.

[0067] The embodiments of this example have been described above. However, this example is not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of this example, and all of them are within the protection scope of this example.

Claims

1. A device for treating flue gas from steelmaking electric furnaces, characterized in that, The device includes a liquid atomizer, a compressed air generator, and a ceramic bracket (1). The output end of the liquid atomizer is connected to a water pipe (2) for conveying the water mist generated by the liquid atomizer. One end of the water pipe (2) is connected to an atomizing spray ring (3) with a hollow interior. The output end of the compressed air generator is connected to a compressed air pipe (4) for conveying the compressed air generated by the compressed air generator. One end of the compressed air pipe (4) is connected to an air curtain ring (5) with a hollow interior. A flow regulating valve (6) and a differential pressure transmitter (7) are fixedly installed on both the water pipe (2) and the compressed air pipe (4). The central axes of the atomizing spray ring (3) and the air curtain ring (5) are both collinear with the center axis of the electrode. The outer surfaces of the atomizing spray ring (3) and the air curtain ring (5) are fixedly connected to the ceramic bracket (1). The outer surface of the ceramic bracket (1) is fixedly connected to the top cover of the electric furnace. Multiple A-type spray holes (8) are arranged in a circular array with their central axis as the center on the atomizing spray ring (3). Multiple B-type nozzles (9) are arranged in a circular array with their central axis as the center on the air curtain ring (5). One end of nozzle A (8) and nozzle B (9) are both angled downward toward the bottom of the electrode; It also includes A guide vane (10), B guide vane (11), A drive component (12) and B drive component (13). The A guide vane (10) is slidably connected to the inner wall of the A nozzle (8) on both sides. The A guide vane (10) can move to the first position and the second position along the direction of water mist movement. The A guide vane (10) is connected to the A drive unit (12) that drives its movement. The A guide vane (10) divides the A nozzle (8) into the A channel and the B channel. When the A guide vane (10) moves to the first position, the A guide vane (10) blocks the A flow channel and the B flow channel is in the open state; when the A guide vane (10) moves to the second position, both the A flow channel and the B flow channel are in the open state. The B guide vane (11) is slidably connected to the inner wall of the B nozzle (9) on both sides. The B guide vane (11) can move to the first position and the second position along the direction of water mist movement. The B guide vane (11) is connected to the B drive unit (13) that drives its movement. The B guide vane (11) divides the B nozzle (9) into the C channel and the D channel. When the B guide vane (11) moves to the first position, the B guide vane (11) blocks the C channel and the D channel is open; when the B guide vane (11) moves to the second position, both the C channel and the D channel are open. The A drive component (12) includes an A turntable (121) rotatably mounted on the atomizing spray ring (3). Two A inclined grooves (122) are opened on the A turntable (121). An A guide post (123) is slidably connected to the inner wall of the A inclined groove (122). One end of the A guide post (123) is fixedly connected to the A guide plate (10). The A turntable (121) is connected to an A drive mechanism (124) that drives it to rotate around its central axis. The A drive mechanism (124) includes an A arc-shaped rack (1241) fixedly installed on the outside of the A turntable (121). An A rack (1242) is engaged on one side of the A arc-shaped rack (1241). The A rack (1242) is connected to an A support frame (1243) that can move along the axial direction of the ceramic bracket (1). The A support frame (1243) is connected to an A telescopic drive member (1244) that drives its movement.

2. The electric arc furnace dust treatment device according to claim 1, characterized in that, The liquid atomizer, compressed air generator and flow regulating valve (6) are connected to a controller, which is used to control the power of the liquid atomizer and compressed air generator and the opening degree of the flow regulating valve (6).

3. The electric arc furnace dust treatment device according to claim 1, characterized in that, The B drive component (13) includes a B turntable (131) rotatably mounted on the air curtain ring (5), a B inclined groove (132) is provided on the B turntable (131), a B guide post (133) is slidably connected on the B inclined groove (132), one end of the B guide post (133) is fixedly connected to the B guide vane (11), and the B turntable (131) is connected to a B drive mechanism (134) that drives it to rotate around its central axis.

4. The electric arc furnace dust treatment device according to claim 3, characterized in that, The B drive mechanism (134) includes a B arc-shaped rack (1341) fixedly installed on the outside of the B turntable (131). A B rack (1342) is engaged on one side of the B arc-shaped rack (1341). The B rack (1342) is connected to a B support frame (1343) that can move along the axial direction of the ceramic bracket (1). The B support frame (1343) is connected to a B telescopic drive member (1344) that drives its movement.

5. The electric arc furnace dust treatment device according to claim 1, characterized in that, A ramp is provided at the outlet end of the A flow channel (10) near the A flow channel.

6. The electric arc furnace dust treatment device according to claim 5, characterized in that, The B guide vane (11) has an inclined platform at the outlet end near the B flow channel.

7. The electric arc furnace dust treatment device according to claim 6, characterized in that, Elastic rubber pads are provided on the protrusions of both guide vane A (10) and guide vane B (11).

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