Exhaust structure and intermediate frequency furnace

Abstract

The utility model discloses an exhaust structure, which relates to the technical field of flue gas control and mainly comprises a dust collection flue, one end of the dust collection flue is connected to a furnace mouth, the other end of the dust collection flue is connected to a main flue, and a guide plate is arranged in the dust collection flue and used for guiding the direction of flue gas and generating flue gas vortex at the main flue. The utility model further provides an intermediate frequency furnace which comprises a furnace cover, a furnace body and the exhaust structure, and the furnace cover can cover the furnace body. The guide plate in the dust collection flue can guide flue gas, so that the flue gas flows in a specific direction, vortex can be generated at the main flue, the absorption amount of the flue gas can be improved, and the amount of the flue gas exhausted into air can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of flue gas control, in particular to exhaust structure and intermediate frequency furnace. BACKGROUND

[0002] Intermediate frequency furnace has obvious advantages in the field of melting of metal materials. It can quickly heat the metal to the melting point, realize efficient melting, and compared with the traditional gas melting mode, the energy consumption of intermediate frequency furnace is lower, more environmentally friendly, and the operation is more simple. Therefore, it is widely used in smelting copper, aluminum, zinc and other non-ferrous metals, and high-quality castings are produced. However, in the process of melting and pouring molten iron, a large amount of flue gas is generated at high temperature, which pollutes the air and affects human health. The trace heavy metals contained in the flue gas can cause soil, water and biological pollution under certain conditions, so the flue gas needs to be treated by dust collection. At present, there are two kinds of dust collection treatment of flue gas. One is to set a bag type dust collector above the mouth of the intermediate frequency furnace, but this setting method cannot be too close to the furnace mouth, so the dust collection range of the bag type dust collector is limited, only part of the flue gas can enter the dust collection port, and most of the flue gas still disperses into the air. The second is to set a furnace cover on the mouth of the intermediate frequency furnace to keep the intermediate frequency furnace closed, and the flue gas is discharged during the melting process of molten iron, but since the molten iron continuously generates flue gas, the flue gas cannot be fully discharged, and part of the flue gas will still be discharged into the air during the pouring process of molten iron.

[0003] Patent CN210242416U discloses an intermediate frequency furnace with a cyclone type heat preservation and dust removal furnace cover, which is provided with a furnace cover combined with a dust absorption cover. The dust is absorbed in a closed state of the furnace cover, but a large amount of flue gas will still be discharged into the air during the pouring process. Therefore, an exhaust structure and intermediate frequency furnace are needed to improve the absorption amount of flue gas and reduce the amount of flue gas discharged into the air. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing an exhaust structure and intermediate frequency furnace to solve the problems existing in the prior art, improve the absorption amount of flue gas, and reduce the amount of flue gas discharged into the air.

[0005] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0006] The utility model provides an exhaust structure, which comprises a dust collection flue, one end of the dust collection flue is connected to the furnace mouth, the other end is connected to a total flue, and a guide plate is arranged in the dust collection flue.

[0007] Preferably, a plurality of guide plates are arranged in the dust collection flue, and are arranged in sequence and staggered along the length direction of the dust collection flue.

[0008] Preferably, a fence is further included, which is arranged above the furnace opening and encloses the furnace opening, and a furnace cover is arranged above the fence, which can cover the fence, and the dust collection flue is connected to the side of the fence.

[0009] Preferably, the side of the fence is further provided with an opening, and the edge of the opening is fixedly connected with the edge of the nozzle of the intermediate frequency furnace.

[0010] Preferably, the dust collection flue is in a triangular prism shape, one side of the dust collection flue is connected to the side of the fence, and the top end of the dust collection flue is connected to the total flue.

[0011] Preferably, an external dust collection device is further included, which is fixedly connected above the furnace cover, and the dust collection port of the external dust collection device extends beyond the edge of the furnace cover.

[0012] Preferably, the external dust collection device is a fan-shaped metal dust collection cover, the center point of the fan-shaped metal dust collection cover coincides with the center point of the furnace cover, the arc edge of the fan-shaped metal dust collection cover extends out of the edge of the furnace cover and is above the nozzle of the intermediate frequency furnace.

[0013] Preferably, the central angle of the fan-shaped metal dust collection cover is 80°-100°.

[0014] The utility model also provides a kind of intermediate frequency furnace, including furnace cover, furnace body and the exhaust structure as described above, the furnace cover can cover the furnace body.

[0015] Preferably, the intermediate frequency furnace further includes a rotating shaft and a connecting frame, one end of the connecting frame is fixedly connected to the rotating shaft, the other end is fixedly connected to the top of the furnace cover, and the rotating shaft is rotatably connected to the furnace body by a bearing.

[0016] The utility model has achieved the following technical effects compared with the prior art:

[0017] The dust collection flue is connected to the furnace opening at one end and to the total flue at the other end, and a guide plate is arranged inside the dust collection flue, which is used to guide the direction of flue gas and generate flue gas vortex at the total flue. The guide plate in the dust collection flue can guide the flue gas, so that the flue gas flows in a specific direction. When the flue gas enters the total flue, vortex is generated, and the vortex effect can make the dust particles in the flue gas more easily gather and settle under the action of centrifugal force, thereby improving the collection efficiency of the dust collection system for dust flue gas, increasing the absorption amount of flue gas, reducing the amount of flue gas discharged into the air, and protecting the environment. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative labor.

[0019] Fig. 1 The structure schematic view of the exhaust structure arranged in the intermediate frequency furnace in the embodiment of the present application is shown in the figure.

[0020] Fig. 2 The top view of the exhaust structure arranged in the intermediate frequency furnace in the embodiment of the present application is shown in the figure.

[0021] In the figure: 1 - dust collection flue; 2 - total flue; 3 - furnace cover; 4 - external dust collection device; 5 - connecting frame; 6 - bearing; 7 - rotating shaft; 8 - fence; 9 - guide plate. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0023] The purpose of the present application is to provide an exhaust structure and an intermediate frequency furnace, so as to solve the problems in the prior art, improve the absorption amount of flue gas, and reduce the amount of flue gas discharged into the air.

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail in combination with the drawings and specific embodiments.

[0025] Embodiment one

[0026] As Figs. 1-2The utility model provides a kind of exhaust structure, including dust collection flue 1, dust collection flue 1 one end is connected at furnace mouth, the other end is connected at general flue 2, and dust collection flue 1 inside is provided with guide plate 9, guide plate 9 is used to guide the direction of flue gas and generates flue gas vortex at general flue 2.Guide plate 9 in dust collection flue 1 can guide flue gas, so that flue gas flows in specific direction.When flue gas enters general flue 2, vortex is generated, and vortex effect can make dust particles in flue gas more easily gather and settle under the action of centrifugal force, so as to improve the collection efficiency of dust collection system to dust flue gas, improve the absorption amount of flue gas, reduce the amount of flue gas into air, protect environment.And, the existence of guide plate 9 makes that dust collection flue 1 can adapt to different furnace mouth working condition and flue gas flow variation, no matter what kind of fluctuation guide plate 9 can effectively guide and adjust flue gas at furnace mouth, ensure that dust collection system always maintains good working condition, high adaptability can improve flexibility and reliability of entire system, meet the needs of different production processes, while guide plate 9 can avoid turbulence and impact of flue gas in flue, reduce the wear and damage risk of flue, and stable flue gas flow also helps to reduce the possibility of fire and explosion, improve the safety of production process.

[0027] In some embodiments, guide plate 9 is inclinedly provided with multiple in dust collection flue 1, and is staggered along the length direction of dust collection flue 1.Multiple guide plates 9 are staggered along the length direction of dust collection flue 1, can guide flue gas multiple times, and multiple guiding mode can more effectively change the flow direction of flue gas, so that it flows according to predetermined path, thereby being capable of enhancing the control ability of flue gas direction and improving guiding effect.Staggered guide plate 9 can also make flue gas continuously change flow direction in dust collection flue 1, thereby promoting the mixing of flue gas, helping dust particles in flue gas to be more evenly distributed, improving dust collection efficiency, and simultaneously, mixed flue gas is also more easily to generate stable vortex at general flue 2, further enhancing dust collection effect.

[0028] It should be noted that guide plate 9 can also be provided with other kinds, such as arc-shaped guide plate 9 or guide plate 9 in the form of logarithmic line, etc., as long as it can ensure that flue gas generates vortex at general flue 2 for easy discharge.

[0029] In some embodiments, the exhaust device further comprises a fence 8 arranged above the furnace opening and enclosing the furnace opening, and a furnace cover 3 arranged above the fence 8 and capable of covering the fence 8, and the dust collection flue 1 is connected to the side of the fence 8. The fence 8 arranged above the furnace opening and enclosing the furnace opening can effectively concentrate the flue gas generated at the furnace opening, and the dust collection flue 1 can more easily capture the flue gas and guide it to the main flue 2 for processing, so as to ensure that most of the flue gas can enter the dust collection flue 1 for processing, improve the collection efficiency of the flue gas, reduce the unorganized emission of the flue gas, and reduce the pollution to the surrounding environment. At the same time, the combination of the fence 8 and the furnace cover 3 forms a relatively closed space, which can prevent the flue gas from spreading around, and in particular when the furnace opening is operated or an abnormal situation occurs, the fence 8 can play a good protective role, reducing the harm of the flue gas to the operators and surrounding equipment.

[0030] In some embodiments, the side of the fence 8 is further provided with an opening, and the edge of the opening is fixedly connected with the edge of the nozzle of the intermediate frequency furnace. The fixed connection of the edge of the opening with the edge of the nozzle can form a tight connection at the nozzle, ensuring that most of the flue gas in the intermediate frequency furnace can be collected into the fence 8.

[0031] In some embodiments, the dust collection flue 1 is in the shape of a triangular prism, one side of the dust collection flue 1 is connected to the side of the fence 8, and the top end away from the fence 8 is connected to the main flue 2. The diameter of the flue gas inlet is relatively large, and the diameter of the vortex formed at the opening of the main flue 2 is relatively small. The relatively large diameter of the flue gas inlet can more widely collect the flue gas discharged from the fence 8. Since the fence 8 encloses the furnace opening, the flue gas above the furnace opening can be quickly captured by the large-diameter inlet of the dust collection flue 1, ensuring efficient collection of the flue gas. From the large-diameter inlet to the small-diameter vortex, the flow area of the flue gas gradually decreases, and according to the principle of fluid mechanics, the flow velocity will correspondingly increase. The increase in velocity helps to increase the inertial force of the dust particles in the flue gas, so that the dust is more easily separated and settled under the action of the vortex, thereby enhancing the dust collection effect.

[0032] In some embodiments, the exhaust device further comprises an external dust collection device 4 fixedly connected above the furnace cover 3, and the dust collection port of the external dust collection device 4 extends beyond the edge of the furnace cover 3. The dust collection port of the external dust collection device 4 extends beyond the edge of the furnace cover 3, which can expand the dust collection range. During the pouring process, some flue gas may escape from the edge of the nozzle, and this design can effectively capture these escaping flue gas, ensuring that more flue gas is collected for processing, improving the comprehensiveness and thoroughness of dust collection.

[0033] In some embodiments, the external dust collecting device 4 is a metal dust collecting hood in a fan shape, the material is 15CrMo, the top of the metal dust collecting hood in a fan shape is coincided with the center point of the furnace cover 3, the arc edge of the metal dust collecting hood in a fan shape extends out of the edge of the furnace cover 3, and is located above the tuyere of the intermediate frequency furnace, wherein the central angle of the metal dust collecting hood in a fan shape is 80°-100°, preferably 90°, and the smoke escaping from the tuyere during the pouring process can be collected by the metal dust collecting hood in a fan shape.

[0034] Embodiment two

[0035] The embodiment also provides an intermediate frequency furnace, which comprises a furnace cover 3, a furnace body and an exhaust structure as described in embodiment one, the furnace cover 3 can cover the furnace body, and the intermediate frequency furnace further comprises a rotating shaft 7 and a connecting frame 5, one end of the connecting frame 5 is fixedly connected with the rotating shaft 7, the other end is fixedly connected to the top of the furnace cover 3, and the rotating shaft 7 is rotatably connected to the furnace body through a bearing 6. The furnace cover 3 is made of light and thin high-temperature-resistant material, such as 15CrMo, the rotating shaft 7 is made of high-hardness material, such as 42CrMoS4, and the bearing 6 is used for rotation, so as to improve the rotation fluency and overall durability.

[0036] The principle and implementation mode of the utility model are described by using specific examples in the utility model, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the utility model, the specific implementation mode and application range will be changed. In conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. An exhaust structure, characterized in that: It includes a dust collecting flue, one end of which is connected to the furnace mouth and the other end is connected to the main flue, and a plurality of guide plates are arranged inside the dust collecting flue. The plurality of guide plates are arranged in an interlaced manner along the length direction of the dust collecting flue. The guide plates are used to guide the direction of the flue gas and generate flue gas vortexes at the main flue.

2. The exhaust structure according to claim 1, characterized in that: It also includes an enclosure, which is arranged above the furnace mouth and encloses the furnace mouth, and a furnace cover is arranged above the enclosure, and the furnace cover can cover the enclosure, and the dust collection flue is connected to the side of the enclosure.

3. The exhaust structure according to claim 2, characterized in that: The side of the enclosure is further provided with an opening, the edge of the opening being fixedly connected to the edge of the furnace nozzle of the intermediate frequency furnace.

4. The exhaust structure according to claim 2, characterized in that: The dust collecting flue is in the shape of a triangular prism, one side of the dust collecting flue is connected to the side of the enclosure, and the top end away from the enclosure is connected to the main flue.

5. The exhaust structure according to claim 1, characterized in that: It also includes an external dust collecting device, which is used to be fixedly connected to the top of the furnace cover, and the dust collecting port of the external dust collecting device extends beyond the outer side of the edge of the furnace cover.

6. The exhaust structure according to claim 5, characterized in that: The external dust collecting device is a metal dust collecting hood with a fan-shaped structure, the vertex of the metal dust collecting hood with a fan-shaped structure coincides with the center point of the furnace cover, the arc edge of the metal dust collecting hood with a fan-shaped structure extends out of the edge of the furnace cover and is located above the furnace nozzle of the medium frequency furnace.

7. The exhaust structure according to claim 6, characterized in that: The central angle of the fan-shaped metal dust collecting cover is 80°-100°.

8. A medium frequency furnace, characterized in that: The invention comprises a furnace cover, a furnace body and the exhaust structure according to any one of claims 1 to 7, wherein the furnace cover can cover the furnace body.

9. The intermediate frequency furnace according to claim 8, characterized in that: The intermediate frequency furnace also includes a rotating shaft and a connecting frame. One end of the connecting frame is fixedly connected to the rotating shaft, and the other end is fixedly connected to the top of the furnace cover. The rotating shaft is rotatably connected to the furnace body through a bearing.

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