Smoke waste heat recovery device for steel-making electric furnace

Abstract

The invention relates to a smoke waste heat recovery device for a steelmaking electric furnace, and belongs to the field of steelmaking electric furnaces, the smoke waste heat recovery device comprises a protective cover and an electric furnace main body arranged in the protective cover, a first gas pipe is vertically and fixedly arranged at the top of the protective cover in a penetrating manner, the bottom end of the first gas pipe is connected with the electric furnace main body, and a waste heat recovery mechanism is arranged on the protective cover; the waste heat recovery mechanism comprises a collection cover, the collection cover is fixedly arranged at the top of the protection cover in a sealed mode, a second air pipe is connected to the collection cover and connected with an air exhaust system, the top end of the first air pipe is located in the protection cover, clear water is arranged in the protection cover, and the water level of the clear water is lower than that of the top end of the first air pipe. By dissolving dust in flue gas in clear water, the flue gas is filtered, and a filter screen is prevented from being adopted for filtering, so that the situation that the fluency of a flue gas flow channel is affected due to blockage of the filter screen can be prevented, and the filtering effect is improved.

Description

Technical Field

[0001] The invention relates to a smoke waste heat recovery device for a steelmaking electric furnace, belonging to the field of steelmaking electric furnaces. Background Art

[0002] An electric arc furnace (EAF) is a type of equipment used to smelt steel, primarily by heating scrap metal or molten iron with an electric arc. Electrodes generate a high-temperature arc, heating the scrap to melting temperature, creating liquid steel. This furnace is commonly used for steel recycling and small-batch steel production.

[0003] The Chinese utility model patent with the announcement number CN218329370U discloses a steelmaking electric furnace smoke collection device, comprising a protective cover, a movable cover movably connected to the top of the protective cover, an electric furnace body fixed inside the protective cover, a first exhaust pipe vertically embedded and fixed in the center of the movable cover, a support frame fixed to the outside of the first exhaust pipe, the first exhaust pipe embedded and fixed to the top cover plate of the electric furnace body, a hydraulic rod fixed to one side of the protective cover, a corrugated cover fixed to the top of the movable cover, a collection pipe fixed to the top of the corrugated cover, and a dust removal mechanism on one side of the collection pipe. When in use, the utility model filters dust in the smoke through a filter screen, separating the dust from the smoke, thereby facilitating subsequent purification work. After the dust is filtered, it is recovered by gravity in a recovery box for convenient centralized processing. The motor is started at a fixed time to drive the screw to rotate. At this time, the positioning rod prevents the cleaning brush from rotating, so that the cleaning brush can move along the screw, so that the cleaning brush moves to clean the filter screen, ensuring the filtering effect of the filter screen during long-term use. However, in the prior art, a filter is used to filter dust in the flue gas. Although the service life of the filter can be extended by cleaning the filter, the filter holes of the filter are still easily clogged after long-term operation. The clogged filter not only affects the smoothness of the flue gas flow, but also affects the flue gas filtration effect.

[0004] Therefore, there is a need for a smoke waste heat recovery device for steelmaking electric furnaces to ensure the smoothness of smoke flow and improve the smoke filtration effect. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in order to overcome the shortcomings of the existing technology, a smoke waste heat recovery device for a steelmaking electric furnace is provided to ensure the smoothness of smoke flow and improve the smoke filtration effect.

[0006] The technical solution adopted by the present invention to solve the above-mentioned problem is: a smoke waste heat recovery device for a steelmaking electric furnace, comprising a protective cover and an electric furnace body arranged in the protective cover, a first air pipe vertically fixedly penetrated through the top of the protective cover, the bottom end of the first air pipe being connected to the electric furnace body, and a waste heat recovery mechanism being provided on the protective cover; The waste heat recovery mechanism includes a collecting cover, which is fixedly and sealedly arranged on the top of the protective cover. The collecting cover is connected to a second air pipe, which is connected to an exhaust system. The top end of the first air pipe is located in the protective cover. Clean water is provided in the protective cover, and the water level of the clean water is lower than the top end of the first air pipe. A transmission component is provided in the protective cover, and the transmission component is connected to the top end of the first air pipe. The transmission assembly includes a first rotating tube and a first stirring tube. The first rotating tube is sleeved on the top of the first air pipe. The top of the first rotating tube is sealed. The top of the first rotating tube is driven by a motor. One end of the first stirring tube is connected to the outer wall of the first rotating tube. The other end of the first stirring tube is located in the clean water. The connection between the first stirring tube and the first rotating tube is located above the first air pipe.

[0007] Preferably, the transmission assembly further comprises a transmission unit and an auxiliary unit, and the first rotating tube is connected to the auxiliary unit via the transmission unit; The auxiliary unit includes a second rotating tube, which is arranged vertically. A rotating support seat is provided on the outer peripheral wall of the second rotating tube. The rotating support seat is fixedly connected to the first air pipe. A second stirring tube is provided on the second rotating tube. The second stirring tube is located in the clean water. The first rotating tube is connected to the second rotating tube through a transmission unit.

[0008] Preferably, the axis of the second stirring tube is perpendicular to and intersects with the axis of the second rotating tube.

[0009] Preferably, the transmission unit includes a driving gear and a driven gear, the driving gear is mounted on the outer peripheral wall of the first rotating tube, the driven gear is mounted on the outer peripheral wall of the second rotating tube, and the driven gear is meshed with the driving gear.

[0010] Preferably, a water inlet and a drain are provided on the collecting cover, the water inlet is connected to the water supply system, and the drain is connected to the recovery system.

[0011] Preferably, the electric furnace body includes a furnace body and a furnace cover arranged on the top of the furnace body, and the first gas pipe is connected to the furnace cover.

[0012] Preferably, the protective cover includes an upper cover body and a lower cover body distributed up and down, the upper cover body is driven to rise and fall by a hydraulic cylinder, the collecting cover is arranged on the top of the upper cover body, and the first air pipe is fixedly penetrated on the upper cover body.

[0013] Preferably, a heat exchange mechanism is provided on the collecting hood, and the heat exchange mechanism includes a heat exchange tube. The heat exchange tube passes through the collecting hood, and the heat exchange tube is rotatably and sealedly connected to the collecting hood. The part of the heat exchange tube located in the collecting hood is immersed in clean water.

[0014] Preferably, the heat exchange tube includes a heat exchange section and two rotating sections, the heat exchange section is located in the collecting cover, the two rotating sections are horizontally symmetrically arranged on both sides of the heat exchange section, the rotating section passes through the collecting cover, and the rotating section rotates and is sealed with the collecting cover. Two magnet blocks are provided on the heat exchange section, and the two magnet blocks are evenly distributed circumferentially with the first air pipe as the center. An adsorption block is fixedly connected to the first rotating tube, and the adsorption block is located above the magnet block. The adsorption block is arranged opposite to one of the magnet blocks. Connecting plates are fixedly provided on both sides of the rotating section, and a spring is provided between the connecting plate and the protective cover, and the two ends of the spring are respectively connected to the connecting plate and the protective cover.

[0015] Preferably, the heat exchange section is annular and is coaxially sleeved on the first air pipe.

[0016] Compared with the prior art, the advantages of the present invention are: The present invention provides a smoke waste heat recovery device for a steel-making electric furnace. The device filters the smoke by dissolving dust in the smoke in clean water, avoiding the use of a filter screen for filtering, thereby preventing the smoothness of the smoke flow channel from being affected by clogging of the filter screen and improving the filtering effect. Moreover, the clean water is stirred by the rotation of the first stirring rod tube and the second stirring tube, and the bubbles in the clean water are dispersed, thereby increasing the contact area between the clean water and the dust, improving the efficiency of the clean water dissolving in the water, and improving the smoke filtering efficiency. Secondly, the rotation of the first rotating tube causes the heat exchange tube to swing in a circular motion, which not only further disperses the bubbles in the clean water, but also improves the heat exchange efficiency of the clean water in the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional diagram of a smoke waste heat recovery device for a steelmaking electric furnace according to the present invention; Figure 2 This is a front view of a smoke waste heat recovery device for a steelmaking electric furnace according to the present invention; Figure 3 This is a left side view of a smoke waste heat recovery device for a steelmaking electric furnace according to the present invention; Figure 4 This is a top view of a smoke waste heat recovery device for a steelmaking electric furnace according to the present invention; Figure 5 This is a cross-sectional view of a smoke waste heat recovery device for a steelmaking electric furnace according to the present invention; Figure 6 Schematic diagram of the connection structure between the waste heat recovery mechanism and the heat exchange mechanism; Figure 7 It is a structural diagram of the waste heat recovery mechanism; Figure 8 is a structural diagram of the transmission component; Figure 9It is a structural diagram of the heat exchange mechanism.

[0018] in: Protective cover 1, electric furnace body 2, first gas pipe 3, waste heat recovery mechanism 4, heat exchange mechanism 5; Upper cover 11, lower cover 12, hydraulic cylinder 13; Furnace body 21, furnace cover 22; Collection cover 41, second air pipe 42, transmission component 43, water inlet 44, drain outlet 45; First rotating tube 431, first stirring tube 432, motor 433, transmission unit 434, auxiliary unit 435; Driving gear 4341, driven gear 4342; Second rotating tube 4351, rotating support base 4352, second stirring tube 4353; Heat exchange tube 51, magnet block 52, adsorption block 53, connecting plate 54, spring 55; Heat exchange section 511, rotating section 512. DETAILED DESCRIPTION

[0019] like Figure 1-9 As shown, in this embodiment, a smoke waste heat recovery device for a steelmaking electric furnace comprises a protective cover 1 and an electric furnace body 2 disposed within the protective cover 1. A first air pipe 3 is vertically fixedly provided on the top of the protective cover 1. The bottom end of the first air pipe 3 is connected to the electric furnace body 2. A waste heat recovery mechanism 4 is provided on the protective cover 1. The waste heat recovery mechanism 4 includes a collecting cover 41, which is fixed and sealed on the top of the protective cover 1, and a second air pipe 42 is connected to the collecting cover 41, and the second air pipe 42 is connected to the exhaust system. The top end of the first air pipe 3 is located in the protective cover 1, and clean water is provided in the protective cover 1, and the water level of the clean water is lower than the top end of the first air pipe 3. A transmission component 43 is provided in the protective cover 1, and the transmission component 43 is connected to the top end of the first air pipe 3, so that the flue gas in the first air pipe 3 is transported to the clean water through the transmission component 43. When working, the flue gas in the second air pipe 42 is discharged through the exhaust system, and the smoke dust in the electric furnace body 2 is transported to the first air pipe 3, and then the smoke is transported to the clean water through the transmission component 43 and forms bubbles. The bubbles float up and burst and are transported to the second air pipe 42. In this way, the dust in the smoke is dissolved in the clean water, so that the smoke is filtered, and the use of a filter screen for filtering is avoided, thereby preventing the smoothness of the smoke flow channel from being affected by the blockage of the filter screen, thereby improving the filtering effect; The transmission component 43 includes a first rotating tube 431 and a plurality of first stirring tubes 432. The first rotating tube 431 is sleeved on the top of the first air pipe 3. The top of the first rotating tube 431 is sealed. The top of the first rotating tube 431 is driven by a motor 433. The plurality of first stirring tubes 432 are evenly distributed circumferentially with the first rotating tube 431 as the center. One end of the first stirring tube 432 is connected to the outer peripheral wall of the first rotating tube 431. The other end of the first stirring tube 432 is located in the clean water. The first stirring tube 432 is connected to the outer peripheral wall of the first rotating tube 431. The connection point of the first rotating tube 431 is located above the first air pipe 3. The smoke in the first air pipe 3 is transported to the first rotating tube 431. The smoke in the first rotating tube 431 is then transported to the clean water through the first stirring tube 432. At the same time, the first rotating tube 431 is driven to rotate by the motor 433. The rotation of the first rotating tube 431 drives the stirring rod tube to rotate synchronously, thus realizing the stirring of the clean water by the first stirring rod tube. In this way, the bubbles in the clean water are dispersed, the contact area between the clean water and the dust is increased, and the efficiency of the clean water dissolving in the water is improved, that is, the smoke filtration efficiency is improved. The transmission assembly 43 further includes a transmission unit 434 and a plurality of auxiliary units 435 . The plurality of auxiliary units 435 are evenly distributed circumferentially around the first rotating tube 431 . The first rotating tube 431 is connected to the auxiliary units 435 via the transmission unit 434 . The auxiliary unit 435 includes a second rotating tube 4351, which is arranged vertically. A rotating support seat 4352 is provided on the outer peripheral wall of the second rotating tube 4351, and the rotating support seat 4352 is fixedly connected to the first air pipe 3. A plurality of second stirring tubes 4353 are provided on the second rotating tube 4351. The plurality of second stirring tubes 4353 are evenly distributed circumferentially around the second rotating tube 4351. The second stirring tubes 4353 are located in the clean water. The axis of the second stirring tube 4353 is perpendicular to and intersects with the axis of the second rotating tube 4351. The first rotating tube 431 is connected to the second rotating tube 4351 via the transmission unit 434. The transmission unit 434 includes a driving gear 4341 and a plurality of driven gears 4342. The driving gear 4341 is mounted on the outer circumferential wall of the first rotating tube 431. The plurality of driven gears 4342 correspond one-to-one to the plurality of second rotating tubes 4351. The driven gears 4342 are mounted on the outer circumferential wall of the second rotating tube 4351 and mesh with the driving gear 4341. When the first rotating tube 431 rotates, it drives the driving gear 4341 to rotate synchronously. Because the driving gear 4341 is meshed with the driven gear 4342, the driven gear 4342 drives the second rotating tube 4351 to rotate. The rotating support seat 4352 plays a supporting role in supporting the rotation of the second rotating tube 4351. The rotation of the second rotating tube 4351 drives the second stirring tube 4353 to rotate synchronously. In this way, the rotation of the second stirring tube 4353 further breaks up the bubbles in the clean water, increases the contact area between the clean water and the dust, and further improves the smoke filtration efficiency. Moreover, as the second stirring tube 4353 rotates, the clean water in the second stirring tube 4353 is discharged from one end of the second rotating tube 4351 of the second stirring tube 4353 under the action of centrifugal force, while the clean water in the collection cover 41 enters from the bottom end of the second rotating tube 4351 and is then transported to the second stirring tube 4353. In this way, the stirring direction of the clean water is increased, and the stirring effect of the clean water is further improved. The collection cover 41 is provided with a water inlet 44 and a drain outlet 45. The water inlet 44 is connected to the water supply system, and the drain outlet 45 is connected to the recovery system. As the air flows, the water vapor generated by the clean water is easily discharged along with the air, which will reduce the clean water in the collection cover 41. The water supply system allows the water inlet 44 to add clean water according to the clean water loss rate in the collection cover 41, so that the clean water in the collection cover 41 is maintained within a certain liquid level range. During maintenance and servicing, the clean water containing dissolved dust can be discharged from the drain outlet 45. The collecting hood 41 is provided with a heat exchange mechanism 5, which includes a heat exchange tube 51. The heat exchange tube 51 passes through the collecting hood 41, and the heat exchange tube 51 is rotatably and sealedly connected to the collecting hood 41. The part of the heat exchange tube 51 located in the collecting hood 41 is immersed in clean water. During operation, one end of the heat exchange tube 51 is connected to a water source, so that water enters the heat exchange tube 51 from one end of the heat exchange tube 51. The clean water in the collecting hood 41 can absorb heat from the flue gas and transfer it to the clean water in the heat exchange tube 51 through the heat exchange tube 51. The clean water in the heat exchange tube 51 is discharged from the other end of the heat exchange tube 51 and collected. In fact, the temperature of the flue gas is still relatively high after contacting the clean water in the collecting hood 41. After being discharged from the second air pipe 42, the filtered flue gas is collected and can be used to preheat the raw materials. In this way, waste heat recovery is achieved. The heat exchange tube 51 includes a heat exchange section 511 and two rotating sections 512. The heat exchange section 511 is annular and is located in the collecting cover 41. The heat exchange section 511 is coaxially sleeved on the first air pipe 3. The two rotating sections 512 are horizontally symmetrically arranged on both sides of the heat exchange section 511. The rotating section 512 passes through the collecting cover 41. The rotating section 512 rotates and is sealed with the collecting cover 41. Two magnet blocks 52 are provided on the heat exchange section 511. The two magnet blocks 52 are evenly distributed circumferentially with the first air pipe 3 as the center. An adsorption block 53 is fixedly connected to the first rotating tube 431. In fact, the adsorption block 53 is an iron block. The adsorption block 53 is located above the magnet block 52. The adsorption block 53 is arranged opposite to one of the magnet blocks 52. Connecting plates 54 are fixedly provided on both sides of the rotating section 512. A spring 55 is provided between the connecting plate 54 and the protective cover 1. The two ends of the spring 55 are respectively connected to the connecting plate 54 and the protective cover 1. During the rotation of the first rotating tube 431, the adsorption block 53 is driven to rotate synchronously. When the adsorption block 53 rotates to the top of one of the magnet blocks 52, an adsorption force is generated between the adsorption block 53 and the magnet block 52, so that the heat exchange section 511 rotates around the rotating section 512 at a certain angle. The rotation of the rotating section 512 drives the connecting plate 54 to rotate synchronously and causes the spring 55 to deform. As the first rotating tube 431 rotates, the distance between the adsorption block 53 and the magnet block 52 increases. When the adsorption force between the adsorption block 53 and the magnet block 52 is less than the elastic force of the spring 55, the rotating section 512 is caused to rotate in the opposite direction. The first rotating tube 431 drives the adsorption block 53 to move to the top of the other magnet block 52, and the heat exchange section 511 rotates in the opposite direction by a certain angle. In this way, the heat exchange section 511 circulates and swings in the clean water in the collection cover 41. On the one hand, the clean water is further stirred, and the bubbles in the clean water are further dispersed, thereby improving the smoke filtration efficiency. On the other hand, as the heat exchange section 511 swings, the clean water in the heat exchange section 511 is stirred, thereby facilitating the heat in the clean water in the collection cover 41 to be transferred to the clean water in the heat exchange section 511 through the heat exchange section 511, thereby improving the heat exchange efficiency. It should be noted that in order to improve the heating effect, the temperature of the clean water delivered to the protective cover 1 is consistent with the flue gas temperature; The electric furnace body 2 includes a furnace body 21 and a furnace cover 22 arranged on the top of the furnace body 21, and the first gas pipe 3 is connected to the furnace cover 22; The protective cover 1 includes an upper cover body 11 and a lower cover body 12, which are arranged vertically. The upper cover body 11 is driven to rise and fall by a hydraulic cylinder 13. The collecting cover 41 is arranged on the top of the upper cover body 11. The first air pipe 3 is fixedly provided on the upper cover body 11. To sum up, by dissolving the dust in the flue gas in clean water, the flue gas is filtered and the use of a filter is avoided, thereby preventing the smoothness of the flue gas flow channel from being affected by the blockage of the filter, and improving the filtering effect. Moreover, the clean water is stirred by the rotation of the first stirring rod tube and the second stirring tube 4353, and the bubbles in the clean water are broken up, thereby increasing the contact area between the clean water and the dust, improving the efficiency of the clean water dissolving in the water, and improving the flue gas filtration efficiency. Secondly, by the rotation of the first rotating tube 431, the heat exchange tube 51 is swung in a circle, which not only further breaks up the bubbles in the clean water, but also improves the heat exchange efficiency of the clean water in the heat exchange tube 51.

[0020] In addition to the above embodiments, the present invention also includes other implementation methods. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of protection of the claims of the present invention.

Claims

1. A smoke waste heat recovery device for a steelmaking electric furnace, comprising a protective cover (1) and an electric furnace body (2) arranged in the protective cover (1), wherein a first air pipe (3) is vertically fixedly penetrated through the top of the protective cover (1), and the bottom end of the first air pipe (3) is connected to the electric furnace body (2), characterized in that: The protective cover (1) is provided with a waste heat recovery mechanism (4); The waste heat recovery mechanism (4) includes a collecting cover (41), the collecting cover (41) is fixedly and sealedly arranged on the top of the protective cover (1), the collecting cover (41) is connected to a second air pipe (42), the second air pipe (42) is connected to an exhaust system, the top end of the first air pipe (3) is located in the protective cover (1), clean water is provided in the protective cover (1), the water level of the clean water is lower than the top end of the first air pipe (3), a transmission component (43) is provided in the protective cover (1), and the transmission component (43) is connected to the top end of the first air pipe (3); The transmission assembly (43) comprises a first rotating tube (431) and a first stirring tube (432), wherein the first rotating tube (431) is sleeved on the top end of the first air pipe (3), the top end of the first rotating tube (431) is sealed, the top end of the first rotating tube (431) is driven by a motor (433), one end of the first stirring tube (432) is connected to the outer peripheral wall of the first rotating tube (431), the other end of the first stirring tube (432) is located in the clean water, and the connection between the first stirring tube (432) and the first rotating tube (431) is located above the first air pipe (3).

2. The smoke waste heat recovery device for a steelmaking electric furnace according to claim 1, characterized in that: The transmission assembly (43) further includes a transmission unit (434) and an auxiliary unit (435), and the first rotating tube (431) is connected to the auxiliary unit (435) via the transmission unit (434); The auxiliary unit (435) comprises a second rotating tube (4351), the second rotating tube (4351) is arranged vertically, a rotating support seat (4352) is provided on the outer peripheral wall of the second rotating tube (4351), the rotating support seat (4352) is fixedly connected to the first air pipe (3), a second stirring tube (4353) is provided on the second rotating tube (4351), the second stirring tube (4353) is located in the clean water, and the first rotating tube (431) is connected to the second rotating tube (4351) via the transmission unit (434).

3. The smoke waste heat recovery device for a steelmaking electric furnace according to claim 2, characterized in that: The axis of the second stirring tube (4353) is perpendicular to and intersects with the axis of the second rotating tube (4351).

4. The smoke waste heat recovery device for a steelmaking electric furnace according to claim 2, characterized in that: The transmission unit (434) includes a driving gear (4341) and a driven gear (4342), wherein the driving gear (4341) is mounted on the outer peripheral wall of the first rotating tube (431), and the driven gear (4342) is mounted on the outer peripheral wall of the second rotating tube (4351), and the driven gear (4342) is meshed with the driving gear (4341).

5. The smoke waste heat recovery device for a steelmaking electric furnace according to claim 1, characterized in that: A water inlet (44) and a water outlet (45) are provided on the collecting cover (41); the water inlet (44) is connected to a water supply system, and the water outlet (45) is connected to a recovery system.

6. The smoke waste heat recovery device for a steelmaking electric furnace according to claim 1, characterized in that: The electric furnace body (2) comprises a furnace body (21) and a furnace cover (22) arranged on the top of the furnace body (21), and the first gas pipe (3) is connected to the furnace cover (22).

7. The smoke waste heat recovery device for a steelmaking electric furnace according to claim 1, characterized in that: The protective cover (1) comprises an upper cover body (11) and a lower cover body (12) which are arranged vertically. The upper cover body (11) is driven to rise and fall by a hydraulic cylinder (13). The collecting cover (41) is arranged on the top of the upper cover body (11). The first air pipe (3) is fixedly provided on the upper cover body (11).

8. A smoke waste heat recovery device for a steelmaking electric furnace according to any one of claims 1 to 7, characterized in that: A heat exchange mechanism (5) is provided on the collecting hood (41), and the heat exchange mechanism (5) comprises a heat exchange tube (51). The heat exchange tube (51) passes through the collecting hood (41), and the heat exchange tube (51) is rotatably and sealedly connected to the collecting hood (41). The portion of the heat exchange tube (51) located inside the collecting hood (41) is immersed in clean water.

9. The smoke waste heat recovery device for a steelmaking electric furnace according to claim 8, characterized in that: The heat exchange tube (51) comprises a heat exchange section (511) and two rotating sections (512). The heat exchange section (511) is located in the collecting cover (41). The two rotating sections (512) are horizontally symmetrically arranged on both sides of the heat exchange section (511). The rotating section (512) passes through the collecting cover (41). The rotating section (512) is rotatably and sealedly connected to the collecting cover (41). Two magnet blocks (52) are provided on the heat exchange section (511). The two magnet blocks (52) are located with the first air pipe (3) as the first magnet block. The first rotating tube (431) is evenly distributed in the circumferential direction of the center. An adsorption block (53) is fixedly connected to the first rotating tube (431). The adsorption block (53) is located above the magnet block (52). The adsorption block (53) is arranged opposite to one of the magnet blocks (52). Connecting plates (54) are fixedly provided on both sides of the rotating section (512). A spring (55) is provided between the connecting plate (54) and the protective cover (1). The two ends of the spring (55) are respectively connected to the connecting plate (54) and the protective cover (1).

10. The smoke waste heat recovery device for a steelmaking electric furnace according to claim 9, characterized in that: The heat exchange section (511) is annular and is coaxially sleeved on the first air pipe (3).

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