Dust hood of medium-frequency induction smelting furnace and smelting furnace

Abstract

The dust hood comprises a cover body, a lifting device and a heat insulation part, the lifting device and the heat insulation part are arranged on the cover body, a suction cavity and a suction opening are formed in the cover body, the suction opening is formed in the suction cavity and used for being connected with a suction fan, the lifting device comprises a driver and a driving rod, and the driver drives the driving rod to reciprocate. The heat insulation piece is connected to the driving rod and comprises a top plate and a side plate, and the side plate is connected to the lower end of the top plate; when the dust removal cover is arranged on a furnace body of the medium-frequency induction melting furnace in a covering mode, the driving rod drives the heat insulation piece to abut against the end face of a furnace opening of the medium-frequency induction melting furnace, and the periphery of the cover body is arranged above the end face of the furnace opening of the medium-frequency induction melting furnace in a spaced mode. Therefore, heat of the smelting furnace and external low-temperature air can be isolated through the heat insulation piece, the effect of sucking smoke can be achieved, the heat of the smelting furnace can be prevented from being taken away by the low-temperature air, the heat loss of the smelting furnace is greatly reduced, and the smelting cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of smelting furnace technology, and in particular to a dust hood for a medium-frequency induction smelting furnace. Background Technology

[0002] A medium-frequency induction furnace is a power supply device that converts 50Hz AC power into medium-frequency (300Hz to 1000Hz) power. It rectifies three-phase AC power into DC power, then converts the DC power into adjustable medium-frequency current, supplying it to the capacitor and induction coil. This generates high-density magnetic lines of force in the induction coil, cutting the metal material held within and inducing significant eddy currents within the metal. Because medium-frequency induction heating operates on the principle of electromagnetic induction, the heat is generated within the workpiece itself. Operators can begin continuous smelting operations within ten minutes of using the furnace. Furthermore, this heating method offers rapid temperature rise, resulting in minimal oxidation. The oxidation loss of pig iron heated by medium-frequency induction is only 0.5%, compared to 2% in gas furnaces and 3% in coal-fired furnaces. Therefore, using medium-frequency heating can save at least 20-50 kg of steel raw materials per ton of pig iron compared to coal-fired furnaces, gaining widespread market acceptance.

[0003] The flue gas from the medium-frequency electric furnace in the smelting workshop mainly consists of FeO, Fe2O3, SiO2, MnO, and blackish-brown fumes produced by the combustion of dust and grease. The dust particle size ranges from approximately 0.01 to 80 μm, falling into the category of ultrafine dust. Most of this dust can enter the lungs through the respiratory tract, causing damage to lung function. Therefore, an effective flue gas ash removal system is essential to ensure a safe operating environment. In practice, suction ports are typically installed on the furnace's dust hood, and external fans are used to extract the flue gas, preventing its dispersion. However, this also results in a significant amount of heat being wasted, increasing the actual electricity consumption per ton of molten iron smelted by 30% compared to the original design standard, thus greatly increasing smelting costs. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a dust hood for a medium-frequency induction melting furnace.

[0005] A dust collection hood for a medium-frequency induction melting furnace according to an embodiment of the present invention includes: A cover body, wherein the cover body is provided with a suction chamber and a suction port, the suction port being located on the suction chamber for connecting a suction fan; A lifting device is provided on the cover body. The lifting device includes a driver and a drive rod. The driver drives the drive rod to reciprocate. A heat insulation component is connected to the drive rod. The heat insulation component includes a top plate and a side plate, and the side plate is connected to the lower end of the top plate. When the dust cover is installed on the furnace body of the medium-frequency induction melting furnace, the drive rod drives the heat insulation component to abut against the furnace mouth end face of the medium-frequency induction melting furnace, and the periphery of the cover is located above the furnace mouth end face of the medium-frequency induction melting furnace.

[0006] According to some embodiments of the present invention, the side plate is provided with a notch, which is located near the pouring port of the smelting furnace.

[0007] According to some embodiments of the present invention, the side plate is provided with flue gas holes.

[0008] According to some embodiments of the present invention, the heat insulation component includes an alloy skeleton and a refractory material layer, the refractory material layer being attached to the alloy skeleton, and the end of the drive rod being connected to the alloy skeleton.

[0009] According to some embodiments of the present invention, it further includes: a limiting component, the limiting component including a slide rod and a slider, the slider being sleeved on the slide rod, the top of the slide rod being connected to the inner sidewall of the cover, and the slider being disposed on the alloy skeleton.

[0010] According to some embodiments of the present invention, the actuator includes a telescopic cylinder and a piston rod, one end of the piston rod being embedded in the telescopic cylinder and the other end being detachably connected to the drive rod.

[0011] According to some embodiments of the present invention, the lifting device further includes a sleeve coupling, one end of which is connected to the piston rod and the other end of which is connected to the drive rod.

[0012] According to some embodiments of the present invention, the device further includes: a mounting plate connected to the drive rod, the mounting plate having a diameter larger than that of the drive rod, and the mounting plate being connected to the heat insulation member at multiple points.

[0013] According to some embodiments of the present invention, a reflective layer is further provided on the inner side of the heat insulation member.

[0014] A smelting furnace according to a second embodiment of the present invention includes: a furnace body and a dust removal hood, wherein the dust removal hood is the dust removal hood of the medium-frequency induction smelting furnace described above.

[0015] Beneficial effects

[0016] This invention's heat insulation component isolates the heat from the smelting furnace from the external low-temperature air. It effectively draws in flue gas while preventing the low-temperature air from carrying away heat from the furnace, thus significantly reducing heat loss and lowering smelting costs. Simultaneously, the low-temperature air drawn into the dust collector hood flows along the outer surface of the heat insulation component, providing some cooling and mitigating the adverse effects of the furnace's high temperature on the component, thereby extending its service life. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is an overall schematic diagram of the smelting furnace according to an embodiment of the present invention; Figure 2 This is a cross-sectional structural diagram of the dust removal hood according to an embodiment of the present invention; Figure 3 This is a three-dimensional schematic diagram of a heat insulation component according to an embodiment of the present invention; Figure 4 This is a three-dimensional schematic diagram of a driver according to an embodiment of the present invention.

[0018] Figure label: 100. Smelting furnace; 10. Dust collector hood; 20. Furnace body; 1. Cover; 11. Suction chamber; 12. Suction port; 2. Lifting device; 21. Driver; 211. Drive cylinder; 212. Piston rod; 22. Drive rod; 3. Insulation component; 31. Top plate; 32. Side plate; 321. Notch; 41. Alloy skeleton; 42. Refractory material layer; 5. Limiting component; 51. Slide rod; 52. Slider; 6. Sleeve coupling; 7. Mounting plate; 8. Pouring port. Detailed Implementation

[0019] The technical solutions of the embodiments disclosed in this application will be clearly and completely described below with reference to the accompanying drawings. The descriptions of the embodiments are merely illustrative and exemplary, and are not intended to limit the scope of this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort should fall within the scope of protection of this disclosure. Furthermore, techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification.

[0020] Combination Figures 1 to 4As shown, a dust collector hood 100 for a medium-frequency induction melting furnace according to an embodiment of the present invention includes: a cover 1, a lifting device 2, and a heat insulation component 3. The cover 1 is provided with a suction chamber 11 and a suction port 12. The suction port 12 is provided on the suction chamber 11 and is used to connect a suction fan. Specifically, the periphery of the cover 1 is bent downward to form a flange, thereby forming a semi-closed chamber structure with an open bottom. The heat insulation component 3 is located in this chamber structure. The heat insulation component 3 includes a top plate 31 and a side plate 32. The side plate 32 is connected to the lower end of the top plate 31. The lifting device 2 is provided on the cover 1. The lifting device 2 includes a driver 21 and a driving rod 22. The driver 21 drives the driving rod 22 to reciprocate. The cover 1 is provided with a through hole. During assembly, the free end of the driving rod 22 is connected to the heat insulation component 3.

[0021] In use, a rotating arm system is usually installed on one side of the furnace body 20 of the medium-frequency induction melting furnace 100. The dust hood 10 is connected to the suspension arm of the rotating arm. The rotation of the rotating arm drives the dust hood 10 to open and close. When the dust hood 10 is placed on the furnace body 20 of the medium-frequency induction melting furnace 100, the drive rod 22 moves downward and drives the heat insulation 3 to abut against the furnace mouth end face of the medium-frequency induction melting furnace 100. The periphery of the cover 1 is set above the furnace mouth end face of the medium-frequency induction melting furnace 100, thereby reducing the heat radiated outward by the melting furnace 100, reducing the adverse effect of the radiated heat on the cover 1, and also reducing heat loss.

[0022] Specifically, when the dust collector hood 10 is installed above the furnace opening of the smelting furnace 100 by the rotating arm, a certain height gap is left between the cover 1 and the furnace opening. This gap is typically between 5cm and 10cm high. This allows for the simultaneous extraction of flue gas from the smelting furnace 100 and the extraction of cold air from outside the furnace. This mixing of cold air and hot flue gas lowers the temperature of the hot flue gas in the extraction pipe, preventing heat accumulation and adverse effects. However, because a large amount of cold air passing through the gap is directly heated by the furnace opening temperature of the smelting furnace 100, it inevitably carries away heat from the vicinity of the furnace opening, resulting in significant heat loss from the smelting furnace 100.

[0023] Therefore, this application sets the cover structure formed by the top plate 31 and the side plate 32 at the furnace opening of the smelting furnace 100. In this way, the lower end of the side plate 32 abuts against the end face of the furnace body 20 of the smelting furnace 100, and the lower end of the cover 1 is spaced at the upper end face of the periphery of the furnace opening of the smelting furnace 100, so that there is a gap between the cover 1 and the plane where the furnace opening is located. The suction force at the suction port 12 can allow the low temperature air near the smelting furnace 100 to enter the dust removal cover 10 through the gap between the cover 1 and the furnace body 20, and flow directly to the suction port 12 side along the space outside the heat insulation member 3.

[0024] At this time, the flue gas generated during the smelting process in the smelting furnace 100 can leave the heat insulation component 3 through the uneven gap between the heat insulation component 3 and the furnace body 20 or through the additional flue gas hole structure, and flow towards the suction port 12 along with the low-temperature airflow. In this way, the heat insulation component 3 can isolate the heat of the smelting furnace 100 from the external low-temperature air, which can both achieve the function of suctioning the flue gas and prevent the low-temperature air from taking away the heat of the smelting furnace 100, thereby greatly reducing the heat loss of the smelting furnace 100 and helping to reduce smelting costs.

[0025] At the same time, when the low-temperature air drawn into the dust collector 10 flows on the outer side of the heat insulation component 3, it can also play a certain role in cooling the heat insulation component 3, thereby reducing the adverse effects of the high temperature of the smelting furnace 100 on the heat insulation component 3 and helping to improve the service life of the heat insulation component 3.

[0026] Because the smelting process requires operations such as filling, adding alloys, removing slag, collecting data on the composition of molten iron, and collecting temperature data, the cover needs to be opened frequently. At the same time, since the filler materials made from scrap steel vary in size, it is impossible to ensure that the cover 1 can be closed before complete smelting. Therefore, if the heat insulation component 3 always protrudes from the cover 1, it will easily affect the operation when the cover is opened, especially when using a crane to fill the filler, which may cause collisions and damage to the heat insulation component 3.

[0027] Therefore, the lifting device 2 can retract the heat insulation component 3 when the cover is opened. That is, the control drive rod 22 drives the heat insulation component 3 to retract to one side of the cover body 1, so that the heat insulation component 3 is retracted into the suction chamber 11, reducing the chance of accidental contact and helping to improve the service life of the heat insulation component 3.

[0028] It is important to note that, such as Figure 1 As shown, since the furnace body 20 of the smelting furnace 100 has a pouring port 8 on one side, and the pouring port 8 is inclined upwards, part of the pouring port structure protrudes from the end plane where the furnace opening is located. This causes the structure of the pouring port to interfere with the heat insulation component 3 when the bottom of the heat insulation component 3 abuts against the end face where the furnace opening is located, easily resulting in an excessively large gap between the heat insulation component 3 and the upper end face of the furnace body 20. Therefore, a notch 321 is provided near the pouring port of the heat insulation component 3. This not only ensures the sealing of the contact between the side plate 32 and the upper end face of the furnace body 20, but also provides a smoother channel for the flue gas of the smelting furnace 100, thereby achieving a balance between flue gas extraction and heat loss.

[0029] As an alternative to the above embodiment, some flue gas holes can be distributed on the side plate 32 of the heat insulation component 3. This allows the bottom shape of the side plate 32 to be shaped along the surface of the furnace body 20 of the smelting furnace 100, especially near the pouring port of the smelting furnace 100. This ensures that the bottom surface of the heat insulation component 3 can be relatively tightly pressed against the surface of the furnace body 20, and then the flue gas can leave the heat insulation component 3 through the flue gas holes on the side plate 32. This ensures that the flue gas of the smelting furnace 100 can flow out smoothly and mix with the low-temperature air, and also prevents the heat of the smelting furnace 100 from being drawn away, achieving a balance between the extraction of flue gas and heat loss, which helps to reduce smelting costs.

[0030] In some embodiments of the present invention, such as Figure 2 As shown, the heat insulation component 3 includes an alloy frame 41 and a refractory material layer 42. The top plate 31 and side plate 32 of the heat insulation component 3 form a cover with an open bottom. The alloy frame 41 forms the frame of the cover, and then the refractory material layer 42 is attached to the inner surface of the alloy frame 41, thereby isolating part of the heat radiated from the smelting furnace 100 to the cover 1, which helps to extend the service life of the cover 1. During connection, the end of the drive rod 22 is connected to the alloy frame 41, thereby improving the connection rigidity and reliability between the drive rod 22 and the heat insulation component 3.

[0031] Preferably, a reflective layer is provided on the inner side of the heat insulation component 3. When the heat insulation component 3 is placed over the furnace opening of the smelting furnace 100, the heat insulation component 3 is very close to the furnace opening of the smelting furnace 100 and is easily affected by the high temperature of the smelting furnace 100. Therefore, a reflective layer is provided on the inner side of the heat insulation component 3. Through this reflective layer, some of the heat radiated outward from the smelting furnace 100 can be reflected, thereby reducing the adverse effects of the heat of the smelting furnace 100 on the heat insulation component 3 and improving the service life of the heat insulation component 3.

[0032] Furthermore, based on the above embodiments, since the dust cover needs to be frequently flipped during use, and the heat insulation component 3 is relatively heavy, when the dust cover is flipped up, the entire heat insulation component 3 is in an upright state. If the connection between the drive rod 22 and the heat insulation component 3 is a single-point connection, the end of the drive rod 22 will support the weight of the heat insulation component 3, which can easily cause the drive rod 22 to bend and affect its service life.

[0033] Therefore, as Figure 2 and Figure 3As shown, the dust cover 10 also includes a limiting component 5, which shares part of the weight of the heat insulation component 3 through the limiting structure. The limiting component 5 includes a sliding rod 51 and a slider 52. The slider 52 is connected to the alloy frame 41, and the slider 52 is sleeved on the sliding rod 51. The top of the sliding rod 51 is connected to the inner side wall of the cover 1. In this way, when the drive rod 22 moves the heat insulation component 3 up and down, the slider 52 set on the heat insulation component 3 can move up and down along the sliding rod 51 synchronously. Even when the dust cover is in the upright state, the sliding rod 51 can effectively limit and support the heat insulation component 3, share the weight of the heat insulation component 3 when it is upright, and prevent the weight of the heat insulation component 3 from being entirely applied to the drive rod 22. This not only makes it easier to reduce the material requirements of the drive rod 22 and reduce the cost of use, but also helps to extend the service life.

[0034] Preferably, such as Figure 4 As shown, the dust cover 10 of the medium frequency induction melting furnace 100 also includes a mounting plate 7, wherein the mounting plate 7 is connected to the drive rod 22, and the diameter of the mounting plate 7 is larger than the diameter of the drive rod 22. When connected, multiple screw holes are provided at the edge of the mounting plate 7, and a multi-point connection is achieved with the heat insulation component 3 through the multiple screw holes, thereby effectively improving the connection reliability between the drive rod 22 and the heat insulation component 3.

[0035] In some embodiments of the invention, such as Figure 4 As shown, the actuator 21 includes a telescopic cylinder and a piston rod 212. One end of the piston rod 212 is embedded in the telescopic cylinder, and the other end is connected to the drive rod 22. The piston of the piston rod 212 can divide the telescopic cylinder into two chambers: a rodless chamber and a rod chamber. When the compressed medium is introduced into the rodless chamber, the piston rod 212 can be pushed outward under pressure, thereby driving the heat insulation element 3 to move downward. When the compressed medium is introduced into the rod chamber, the piston rod 212 can be moved inward under pressure, thereby driving the heat insulation element 3 to move upward.

[0036] Preferably, the other end of the piston rod 212 is detachably connected to the drive rod 22, specifically, as shown in the example below. Figure 2 As shown, the lifting device 2 also includes a sleeve coupling 6. The sleeve coupling uses a sleeve and rigid connecting parts such as keys or tapered pins to connect the two shafts. One end of the sleeve coupling 6 is connected to the piston rod 212, and the other end is connected to the drive rod 22. When the lifting device 2 or the heat insulation component 3 is damaged and needs to be replaced or repaired, the piston rod 212 and the drive rod 22 can be separated through the sleeve coupling, thereby avoiding the need to disassemble the lifting device 2 and the heat insulation component 3 at the same time, which helps to reduce the difficulty of maintenance and improve maintenance efficiency.

[0037] In the description of this invention, it should be understood that if terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0038] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0039] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A dust hood for a medium-frequency induction melting furnace, characterized in that, include: A cover body, wherein the cover body is provided with a suction chamber and a suction port, the suction port being located on the suction chamber for connecting a suction fan; A lifting device is provided on the cover body. The lifting device includes a driver and a drive rod. The driver drives the drive rod to reciprocate. A heat insulation component is connected to the drive rod. The heat insulation component includes a top plate and a side plate, and the side plate is connected to the lower end of the top plate. When the dust cover is installed on the furnace body of the medium-frequency induction melting furnace, the drive rod drives the heat insulation component to abut against the furnace mouth end face of the medium-frequency induction melting furnace, and the periphery of the cover is located above the furnace mouth end face of the medium-frequency induction melting furnace.

2. The dust collector hood for a medium-frequency induction melting furnace according to claim 1, characterized in that, The side plate has a notch, which is located near the pouring port of the smelting furnace.

3. The dust collector hood for a medium-frequency induction melting furnace according to claim 1, characterized in that, The side plate is provided with flue gas holes.

4. A dust collector hood for a medium-frequency induction melting furnace according to claim 2 or 3, characterized in that, The heat insulation component includes an alloy frame and a refractory material layer, the refractory material layer being attached to the alloy frame, and the end of the drive rod being connected to the alloy frame.

5. The dust collector hood for a medium-frequency induction melting furnace according to claim 4, characterized in that, Also includes: A limiting component, comprising a sliding rod and a slider, wherein the slider is sleeved on the sliding rod, the top of the sliding rod is connected to the inner sidewall of the cover, and the slider is disposed on the alloy skeleton.

6. A dust collector hood for a medium-frequency induction melting furnace according to any one of claims 1 to 3 and 5, characterized in that, The actuator includes a telescopic cylinder and a piston rod, one end of which is embedded in the telescopic cylinder and the other end is detachably connected to the drive rod.

7. The dust hood for a medium-frequency induction melting furnace according to claim 6, characterized in that, The lifting device also includes a sleeve coupling, one end of which is connected to the piston rod and the other end of which is connected to the drive rod.

8. A dust collector hood for a medium-frequency induction melting furnace according to claim 1 or 7, characterized in that, Also includes: The mounting plate is connected to the drive rod, and the diameter of the mounting plate is larger than the diameter of the drive rod. The mounting plate is connected to the heat insulation component at multiple points.

9. The dust hood for a medium-frequency induction melting furnace according to claim 4, characterized in that, The inner surface of the heat insulation component is also provided with a reflective layer.

10. A smelting furnace, characterized in that, include: The furnace body and the dust hood, wherein the dust hood is used to cover the furnace body, and the dust hood is the dust hood of the medium frequency induction melting furnace as described in any one of claims 1 to 9.

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