Medium frequency furnace flue gas capture system

Abstract

The present invention discloses a medium frequency furnace smoke capture system, comprising a smoke capture device, a spark arrester, a bag filter, a fan and a smoke exhaust pipe connected in sequence, the smoke capture device comprising a feeding platform, two medium frequency furnaces working alternately in front and behind are arranged beside the feeding platform, a ladle car is arranged on one side of the medium frequency furnace in working state, a smoke hood movable forward and backward is arranged between the two medium frequency furnaces in front and behind, the smoke hood covers one of the medium frequency furnaces and the ladle car, a feeding car for feeding into the medium frequency furnace is arranged on the feeding platform, a longitudinally arranged smoke exhaust main pipeline is arranged above the feeding platform, an automatic switching valve is arranged between the smoke exhaust main pipeline and the smoke hood, and the automatic switching valve can control the air volume switch according to the actual position of the smoke hood. A medium frequency furnace smoke capture system of the present invention has the advantages of simple process, high working efficiency, low cost loss and good smoke capture effect.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a fume capture system for a medium frequency furnace. Background Art

[0002] At present, in the field of metallurgy, for environmental protection and other reasons, a flue gas capture system is required to capture and treat the flue gas generated during metallurgy. The existing medium frequency furnace flue gas capture system has the following defects:

[0003] 1. At present, the main form of smoke capture for medium frequency furnaces is umbrella-shaped rotating hoods, which are set above the furnace mouth of the medium frequency furnace, rotate around the axis between the two medium frequency furnaces, and alternately cover the furnace mouths of the two medium frequency furnaces. When charging, the rotating hood is moved away, and the material is directly charged through the crane on the top of the workshop; when tapping steel, the furnace table of the medium frequency furnace flips forward, and the furnace mouth is outside the hood of the umbrella-shaped hood. In both cases, the umbrella-shaped hood is out of position and cannot effectively extract the smoke, causing the smoke to spread directly into the workshop, causing pollution to the working environment. In addition, due to frequent charging during the steelmaking process, the effective working time of the umbrella-shaped hood above the furnace mouth is very short, and the smoke capture rate is less than about 50%. At present, some manufacturers use the method of secondary dust removal and smoke exhaust through the roof to solve the problem of residual smoke that the umbrella-shaped hood fails to capture and spreads in the workshop. Secondary dust removal and smoke exhaust requires the arrangement of several suction hoods on the top of the plant to extract the residual smoke through independent dust removal equipment. Using this method, the system has high exhaust volume requirements, large equipment investment, and high operating costs. In addition, due to the slow wind speed at the hood opening, the smoke exhaust effect is not obvious, especially in winter when the atmospheric pressure is low. The emitted residual smoke accumulates at the bottom of the workshop and cannot reach the top of the factory building, and the residual smoke in the workshop cannot be effectively discharged.

[0004] In response to the above problems, Patent No. 20082003690104 discloses a medium frequency furnace fume capture device, which can better capture the fume, but uses a one-way reciprocating feeding trolley to feed the medium frequency furnace, and the feeding speed is slow, which affects the metallurgical efficiency; the fume hood and the exhaust main pipe are connected by a rotatable exhaust pipe, which occupies a large space and cannot meet the complex working conditions of the factory; and in the actual medium frequency furnace smelting process, it is found that when the medium frequency furnace station is switched, the fume hood follows the switch, and the valve electric head is damaged by high temperature radiation due to the high temperature above the furnace body, which eventually leads to the pipe network being unable to switch the air volume in time, resulting in the inaction loss of effective air volume, seriously affecting the smoke capture effect of this station and other stations, and even destroying the air volume balance of the entire system;

[0005] 2. At present, it is found in the actual medium frequency furnace smelting process that the quality of steel raw materials recycled by the owner is uneven, especially in the smelting process of scrap steel with a high oil content, it is easy to cause sparks to fly, causing the sparks to fly into the pipeline with negative pressure and enter the dust collector, causing the dust bags to be burned and perforated by the sparks, resulting in poor flue gas filtration effect and substandard emissions. In severe cases, it may even cause the dust with a high carbon content in the dust collector hopper to reignite, causing safety accidents.

[0006] In summary, the existing flue gas capture system has complex procedures, low working efficiency, high cost loss, and poor flue gas capture effect, which leads to a poor workshop environment and seriously affects the physical and mental health of workshop workers. Summary of the invention

[0007] The object of the present invention is to provide a medium frequency furnace fume capture system to solve the problems of complex procedures, low working efficiency, high cost loss and poor fume capture effect proposed in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solution: a medium frequency furnace fume capture system, comprising a fume capture device, a spark arrester, a bag filter, a fan and a smoke exhaust pipe connected in sequence through a pipeline,

[0009] The fume capture device comprises a feeding platform, two intermediate frequency furnaces working alternately are arranged beside the feeding platform, a ladle car is arranged on one side of the intermediate frequency furnace in working state, a smoke collecting hood which can move forward and backward is arranged between the intermediate frequency furnaces, the smoke collecting hood covers one of the intermediate frequency furnaces and the ladle car, a feeding car for feeding materials into the intermediate frequency furnace is arranged on the feeding platform, a longitudinally arranged smoke exhaust main pipe is arranged above the feeding platform, an automatic switching valve is arranged between the smoke exhaust main pipe and the smoke collecting hood, and the automatic switching valve can control the air volume switch according to the actual position of the smoke collecting hood;

[0010] The spark arrester is used to perform secondary spark capture treatment on the flue gas;

[0011] The bag filter is used to purify the flue gas.

[0012] The fan is used to introduce the treated smoke into the smoke exhaust pipe and exhaust it through the smoke exhaust pipe.

[0013] Furthermore, the automatic switching valve includes two valve bodies parallel to each other in front and back, a valve cavity connected to the smoke exhaust main pipe is arranged inside the valve body, a switching mechanism is arranged in the valve cavity, a linkage mechanism is arranged between the front and rear switching mechanisms, and the automatic switching valve also includes a movable pipe connected to the smoke exhaust port of the smoke hood, a collision block mechanism is arranged on the top of the movable pipe, and the collision block mechanism cooperates with the linkage mechanism to drive the front and rear switching mechanisms to realize the switching action.

[0014] Furthermore, the switching mechanism comprises a vertically arranged valve plate, the top of the valve plate is rotatably connected to the top of the valve body through an upright upper valve stem, the top end of the upper valve stem extends out of the valve body, and the bottom of the valve plate is rotatably connected to the bottom of the valve body through an upright lower valve stem;

[0015] The linkage mechanism comprises a longitudinally arranged connecting rod, wherein the front and rear ends of the connecting rod are provided with rotating arms, one end of the rotating arm is connected to the top end of the upper valve stem, and the middle part of the rotating arm is connected to the end of the connecting rod.

[0016] Furthermore, the feeding platform is provided with two front and rear double-row tracks, the double-row tracks include two straight tracks with cross-arranged ends, and the two straight tracks are both slidably connected with a feeding vehicle.

[0017] Furthermore, the spark arrester includes a bracket, a cylinder is arranged on the bracket, the cylinder, the upper and lower parts of the cylinder are respectively provided with an air inlet and an air outlet, the bottom of the cylinder is provided with an ash hopper, the bottom of the ash hopper is provided with an ash discharge valve, and the inner wall of the cylinder is provided with a plurality of downwardly inclined baffles from top to bottom, and the plurality of baffles are staggered up and down.

[0018] Furthermore, the bag filter comprises three interconnected dust removal chambers, the top of the dust removal chamber is provided with an air outlet, the bottom of the dust removal chamber is provided with a material outlet, and the material outlet is provided with an ash discharge valve.

[0019] Furthermore, a wild air valve is provided between the spark arrester and the bag filter.

[0020] Furthermore, a muffler is arranged between the fan and the smoke exhaust pipe.

[0021] Furthermore, a concentration monitoring device is provided on the smoke exhaust pipe.

[0022] A medium frequency furnace flue gas capture process, using the above-mentioned medium frequency furnace flue gas capture system to capture flue gas, the process comprises the following steps:

[0023] Step 1: When the smoke hood moves to the top of an intermediate frequency furnace, the charging car runs to charge the intermediate frequency furnace, and steelmaking is carried out in the smoke hood after the charge is full. When tapping steel, the intermediate frequency furnace pours the molten steel into the ladle car, and the smoke generated during charging, steelmaking and tapping is discharged into the main exhaust pipe through the smoke hood.

[0024] Step 2: The flue gas enters the spark arrester for secondary spark capture treatment;

[0025] Step 3: The flue gas after the secondary spark capture treatment enters the bag filter for dust purification;

[0026] Step 4: The fan introduces the purified flue gas into the exhaust pipe for discharge.

[0027] Compared with the prior art, the present invention provides a medium frequency furnace fume capture system, which has the following beneficial effects:

[0028] 1. The present invention comprises a fume capture device, a spark arrester, a bag filter, a fan and a smoke exhaust pipe which are connected in sequence. The process is simple and the investment cost is low. The fume in each stage of charging, smelting and tapping of the medium frequency furnace is captured by the fume hood and discharged into the main smoke exhaust pipe. Therefore, the fume will not directly diffuse into the workshop to cause pollution to the working environment. The fume capture effect is good and the fume capture rate is as high as 95%. In addition, the automatic switching valve can control the air volume switch according to the actual position of the fume hood, which effectively avoids the loss of air volume and improves the fume capture effect.

[0029] 2. The present invention adds a spark catcher between the smoke capture device and the bag filter, which can effectively capture the sparks entrained in the smoke, prevent the sparks from splashing into the pipeline and the bag filter with the negative pressure, affecting the smoke filtering effect, and also reduce the safety hazards;

[0030] 3. During the smelting process, the medium frequency furnace is fed with the self-contained feeding car. The double-track system allows two feeding cars to feed the same medium frequency furnace alternately. The uninterrupted feeding greatly increases the feeding speed, thereby improving the overall metallurgical efficiency.

[0031] 4. A spark isolation cover is installed on the top of the smoke hood to effectively prevent sparks generated during the smelting process from splashing to the outside and causing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 This is a structural schematic diagram of a medium frequency furnace fume capture system proposed by the present invention;

[0034] Figure 2 for Figure 1 Middle A-direction view;

[0035] Figure 3 Schematic diagram of two working states of the automatic switching valve;

[0036] Figure 4 for Figure 3 Schematic diagram of the matching relationship between a single valve body and a mobile pipeline;

[0037] Figure 5 for Figure 4 Middle BB section view;

[0038] Figure 6 for Figure 4 Enlarged view of part C;

[0039] Figure 7 This is a schematic diagram of the structure of the spark arrester.

[0040] In the figure:

[0041] Flue gas capture device 1

[0042] Feeding platform 101; medium frequency furnace 102; smoke hood 103; automatic switching valve 104; valve body 104.1; switching mechanism 104.2; valve plate 104.2.1; upper valve stem 104.2.2; lower valve stem 104.2.3; reinforcing rib 104.2.4; linkage mechanism 104.3; rotating arm 104.3.1; connecting rod 104.3.2; connecting rod body 104.3.21; telescopic threaded section 104.3.22; movable Movable joint 104.3.23; support frame 104.3.3; movable pipeline 104.4; collision block mechanism 104.5; stud 104.5.1; first locking nut 104.5.2; second locking nut 104.5.3; sleeve 104.5.4; limit nut 104.5.5; ladle car 105; charging car 106; smoke exhaust main pipeline 107; spark isolation cover 108; double track 109; adjustment bracket 110;

[0043] Spark arrester 2; bracket 201; cylinder 202; ash hopper 203; ash discharge valve 204; baffle 205; air inlet 206; air outlet 207

[0044] Bag dust collector 3; dust removal chamber 301; discharge port 302

[0045] Fan 4

[0046] Smoke exhaust 5

[0047] Wild Wind Valve 6

[0048] Silencer 7. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] See also Figure 1-Figure 7The present invention provides a technical solution: a medium frequency furnace fume capture system comprises a fume capture device 1, a spark arrester 2, a bag filter 3, a fan 4 and a smoke exhaust pipe 5 which are sequentially connected through pipelines.

[0051] The fume capture device 1 comprises a feeding platform 101, and two intermediate frequency furnaces 102 are arranged next to the feeding platform 101, wherein a ladle car 105 is arranged on one side of the intermediate frequency furnace 102 in working state, and a fume hood 103 (see patent number 200820036901.6) that can move forward and backward is arranged between the two intermediate frequency furnaces 102, and the fume hood 103 covers one of the intermediate frequency furnaces 102 and the ladle car 105 (see patent number 20 1220265669.X), a charging vehicle 106 (see patent number 201220265668.5) for feeding into the intermediate frequency furnace 102 is arranged on the charging platform 101, a longitudinally arranged smoke exhaust main pipe 107 is arranged above the charging platform 101, and an automatic switching valve 104 is arranged between the smoke exhaust main pipe 107 and the smoke collecting hood 103, and the automatic switching valve 104 can perform air volume switch control according to the actual position of the smoke collecting hood 103;

[0052] A smoke exhaust port is provided on the top of the smoke collecting hood 103, and a spark isolation cover 108 (see patent number 201020101738.4) is hung at the smoke exhaust port. The spark isolation cover 108 is used to prevent sparks from splashing outside when the intermediate frequency furnace 102 is working, causing safety hazards;

[0053] The spark arrester 2 is used for secondary spark capture treatment of flue gas;

[0054] The bag filter 3 is used to purify the flue gas.

[0055] The fan 4 is used to introduce the treated smoke into the smoke exhaust pipe 5 and discharge it through the smoke exhaust pipe 5. The fan 4 is a negative pressure centrifugal fan;

[0056] A wild air valve 6 is provided between the spark arrester 2 and the bag filter 3, and the wild air valve 6 is used to adjust the flue gas temperature to avoid damage to the bag filter 3 due to excessive temperature, thereby extending the service life of the bag filter 3;

[0057] A muffler 7 for reducing noise is provided between the fan 4 and the smoke exhaust pipe 5;

[0058] The smoke exhaust pipe 5 is provided with a concentration monitoring device, which is used to monitor whether the dust concentration of the discharged smoke meets the standard.

[0059] The feeding platform 101 is provided with two front and rear double-row tracks 109, and the double-row tracks 109 include two straight tracks arranged crosswise at the ends, and the two straight tracks are slidably connected with a feeding car 106, and the two feeding cars 106 can work alternately to feed materials to the same intermediate frequency furnace 102, thereby increasing the feeding speed and thus improving the overall metallurgical efficiency;

[0060] The automatic switching valve 104 comprises two valve bodies 104.1 arranged in parallel in front and back, wherein a valve cavity connected to the main smoke exhaust pipe 107 is arranged inside the valve body 104.1, a switching mechanism 104.2 is arranged in the valve cavity, and a linkage mechanism 104.3 is arranged between the front and rear switching mechanisms 104.2, and the automatic switching valve 104 also comprises a movable pipe 104.4 connected to the smoke exhaust port of the smoke hood 103, and a collision block mechanism 104.5 is arranged on the top of the movable pipe 104.4, and the collision block mechanism 104.5 cooperates with the linkage mechanism 104.3 to drive the front and rear switching mechanisms 104.2 to realize the switching action;

[0061] The switching mechanism 104.2 comprises a vertically arranged valve plate 104.2.1, the top of the valve plate 104.2.1 is rotatably connected to the top of the valve body 104.1 via an upright upper valve stem 104.2.2, the top of the upper valve stem 104.2.2 extends out of the valve body 104.1, and the bottom of the valve plate 104.2.1 is rotatably connected to the bottom of the valve body 104.1 via an upright lower valve stem 104.2.3;

[0062] The linkage mechanism 104.3 comprises a longitudinally arranged connecting rod 104.3.2, and a rotating arm 104.3.1 is arranged at the front and rear ends of the connecting rod 104.3.2, one end of the rotating arm 104.3.1 is connected to the top end of the upper valve stem 104.2.2, and the middle part of the rotating arm 104.3.1 is connected to the end of the connecting rod 104.3.2;

[0063] Preferably, the front and rear valve plates 104.2.1 are arranged vertically;

[0064] Preferably, a square head is provided at the top of the upper valve stem 104.2.2. The manufacturing process of the square head is simple and the cost is low. One end of the rotating arm 104.3.1 is connected to the square head. The axis of the rotating arm 104.3.1 and the center line of the square head are located on the same straight line.

[0065] One side of the valve plate 104.2.1 is provided with two upper and lower reinforcing ribs 104.2.4, the reinforcing ribs 104.2.4 are L-shaped structures, and the openings of the upper and lower reinforcing ribs 104.2.4 are arranged opposite to each other;

[0066] A support frame 104.3.3 is provided on the top of the valve body 104.1, and the bottom of the rotating arm 104.3.1 is slidably connected to the support frame 104.3.3, and the support frame 104.3.3 is used to prevent the rotating arm 104.3.1 from bending due to gravity;

[0067] The connecting rod 104.3.2 comprises a connecting rod body 104.3.21, and telescopic threaded sections 104.3.22 are arranged at both ends of the connecting rod body 104.3.21, and the telescopic threaded sections 104.3.22 are connected to the rotating arm 104.3.1 via a movable joint 104.3.23;

[0068] A longitudinally arranged adjustment bracket 110 is provided on the top of the movable pipe 104.4, and two collision block mechanisms 104.5 arranged symmetrically front and back are provided on the adjustment bracket 110, and the collision block mechanism 104.5 comprises a stud 104.5.1 inserted on the adjustment bracket 110, and a sleeve 104.5.4 is sleeved on the stud 104.5.1, and the bottom end of the stud 104.5.1 is fixedly connected with the adjustment bracket 110 through the cooperation of the first locking nut 104.5.2 and the second locking nut 104.5.3, and the top surface of the adjustment bracket 110 is clamped between the first locking nut 104.5.2 and the second locking nut 104.5.3, and a limiting nut 104.5.5 is provided on the top of the stud 104.5.1, and the limiting nut 104.5.5 is used to limit the sleeve 104.5.4;

[0069] The adjusting bracket 110 is provided with a plurality of waist-shaped holes at intervals along its length direction, which is helpful for adjusting the installation position of the stud 104.5.1.

[0070] Working principle of automatic switching valve 104:

[0071] The intermediate frequency furnace located at the front side is intermediate frequency furnace A, and the intermediate frequency furnace located at the rear side is intermediate frequency furnace B;

[0072] The valve body corresponding to the intermediate frequency furnace A is the workstation A, and the valve body corresponding to the intermediate frequency furnace B is the workstation B;

[0073] When the smoke hood moves to the medium frequency furnace A, the moving pipe moves forward with the smoke hood. When the collision block mechanism on the front side collides with the rotating arm at station A, it can generate thrust on the rotating arm at station A, driving the valve plate in station A to rotate, so that the plane where the valve plate is located is parallel to the airflow direction, and the airflow can pass through station A without hindrance, so that station A can be opened; because the rotating arm at station A is connected to the rotating arm at station B by a connecting rod, it can also generate pulling force on the rotating arm at station B, driving the valve plate in station B to rotate, so that the plane where the valve plate is located is perpendicular to the airflow direction, completely blocking the airflow, and station B can be closed;

[0074] When the smoke hood moves to the medium frequency furnace B, the moving duct moves backward with the smoke hood. When the collision block mechanism at the rear side collides with the rotating arm at station B, a thrust is generated on the rotating arm at station B, driving the valve plate in station B to rotate, so that the plane where the valve plate is located is parallel to the airflow direction, and the airflow can pass through station B without hindrance, thereby opening station B. Since the rotating arm at station B is connected to the rotating arm at station B by a connecting rod, a pulling force is generated on the rotating arm at station A at the same time, driving the valve plate in station A to rotate, so that the plane where the valve plate is located is perpendicular to the airflow direction, completely blocking the airflow, and closing station A. Therefore, the air volume switch control function is timely performed according to the actual position of the smoke hood.

[0075] The spark arrester 2 includes a bracket 201, on which a cylinder 202 is arranged, and the cylinder 202, the upper part and the lower part of the cylinder 202 are respectively provided with an air inlet 206 and an air outlet 207, and the bottom of the cylinder 202 is provided with an ash hopper 203, and the bottom of the ash hopper 203 is provided with an ash discharge valve 204, and the inner wall of the cylinder 202 is provided with a plurality of downwardly inclined baffles 205 from top to bottom, and the plurality of baffles 205 are staggered up and down, and the baffles 205 play the role of capturing and extinguishing sparks.

[0076] The spark collector 2 is used to perform secondary spark capture treatment on the flue gas. The flue gas containing sparks enters the cylinder 202 through the air inlet 206. The baffles 205 arranged alternately up and down make the airflow S-shaped. Since the sparks in the flue gas are denser than the flue gas, the flue gas stalls when colliding with the baffle 205 and falls into the ash hopper 203. The ash in the ash hopper 203 is emptied by the ash discharge valve 204.

[0077] The bag filter 3 includes three interconnected dust removal chambers 301, the top of the dust removal chamber 301 is provided with an air outlet, the bottom of the dust removal chamber 301 is provided with a discharge port 302, and the discharge port 302 is provided with an ash discharge valve. The three dust removal chambers 301 work simultaneously, which greatly improves the purification and dust removal efficiency of the flue gas.

[0078] A medium frequency furnace fume capture process, the process comprising the following steps:

[0079] Step 1: When the smoke hood moves to the top of an intermediate frequency furnace, two charging cars alternately run to charge the intermediate frequency furnace, and steelmaking is carried out in the smoke hood after the charge is full. When tapping steel, the intermediate frequency furnace pours the molten steel into the ladle car, and the smoke generated during charging, steelmaking and tapping is discharged into the main exhaust pipe through the smoke hood;

[0080] Step 2: The flue gas enters the spark arrester for secondary spark capture treatment;

[0081] Step 3: The flue gas after the secondary spark capture treatment enters the bag filter for dust purification;

[0082] Preferably, the temperature of the flue gas before entering the bag filter is reduced by the wild air valve 6;

[0083] Step 4: The fan introduces the purified flue gas into the exhaust pipe for discharge.

[0084] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A medium frequency furnace fume capture system, characterized by: The invention comprises a fume collecting device (1), a spark arrester (2), a bag filter (3), a fan (4) and a fume exhaust pipe (5) which are connected in sequence through a pipeline. The fume capture device (1) comprises a feeding platform (101), two intermediate frequency furnaces (102) working alternately are arranged next to the feeding platform (101), a ladle car (105) is arranged on one side of the intermediate frequency furnace (102) in working state, a fume hood (103) movable forward and backward is arranged between the intermediate frequency furnaces (102), the fume hood (103) covers one of the intermediate frequency furnaces (102) and the ladle car (105), a feeding car (106) for feeding materials into the intermediate frequency furnace (102) is arranged on the feeding platform (101), a longitudinally arranged smoke exhaust main duct (107) is arranged above the feeding platform (101), an automatic switching valve (104) is arranged between the smoke exhaust main duct (107) and the smoke hood (103), and the automatic switching valve (104) can control the air volume switch according to the actual position of the smoke hood (103); The spark arrester (2) is used to perform secondary spark capture treatment on the flue gas; The bag filter (3) is used to purify the flue gas from dust; The fan (4) is used to introduce the treated smoke into the smoke exhaust pipe (5) and discharge it through the smoke exhaust pipe (5); The automatic switching valve (104) comprises two valve bodies (104.1) arranged in parallel in front and back, a valve cavity connected to a smoke exhaust main pipe (107) being arranged inside the valve body (104.1), a switching mechanism (104.2) being arranged inside the valve cavity, a linkage mechanism (104.3) being arranged between the front and rear switching mechanisms (104.2), the automatic switching valve (104) further comprising a movable pipe (104.4) connected to a smoke exhaust port of a smoke collecting hood (103), a bumping block mechanism (104.5) being arranged on the top of the movable pipe (104.4), the bumping block mechanism (104.5) cooperating with the linkage mechanism (104.3) to drive the front and rear switching mechanisms (104.2) to realize a switching action; The spark arrester (2) comprises a bracket (201), a cylinder (202) is arranged on the bracket (201), the cylinder (202), an air inlet (206) and an air outlet (207) are arranged at the upper and lower parts of the cylinder (202), an ash hopper (203) is arranged at the bottom of the cylinder (202), an ash discharge valve (204) is arranged at the bottom of the ash hopper (203), and a plurality of downwardly inclined baffles (205) are arranged at intervals from top to bottom on the inner wall of the cylinder (202), and the plurality of baffles (205) are arranged in an alternating manner up and down.

2. The medium frequency furnace fume capture system according to claim 1 is characterized in that: The switching mechanism (104.2) comprises a vertically arranged valve plate (104.2.1), the top of the valve plate (104.2.1) being rotatably connected to the top of the valve body (104.1) via an upright upper valve stem (104.2.2), the top end of the upper valve stem (104.2.2) extending out of the valve body (104.1), and the bottom of the valve plate (104.2.1) being rotatably connected to the bottom of the valve body (104.1) via an upright lower valve stem (104.2.3); The linkage mechanism (104.3) comprises a longitudinally arranged connecting rod (104.3.2), and rotating arms (104.3.1) are arranged at the front and rear ends of the connecting rod (104.3.2), one end of the rotating arm (104.3.1) is connected to the top end of the upper valve stem (104.2.2), and the middle part of the rotating arm (104.3.1) is connected to the end of the connecting rod (104.3.2).

3. The medium frequency furnace fume capture system according to claim 1 is characterized in that: The feeding platform (101) is provided with two front and rear double-row tracks (109), the double-row tracks (109) comprising two straight tracks with their ends arranged crosswise, and the two straight tracks are both slidably connected to a feeding vehicle (106).

4. The medium frequency furnace fume capture system according to claim 1 is characterized in that: The bag filter (3) comprises three interconnected dust removal chambers (301), the top of each dust removal chamber (301) is provided with an air outlet, the bottom of each dust removal chamber (301) is provided with a material outlet (302), and a dust discharge valve is provided at the material outlet (302).

5. The medium frequency furnace fume capture system according to claim 1 is characterized in that: A wild air valve (6) is provided between the spark arrester (2) and the bag dust collector (3).

6. The medium frequency furnace fume capture system according to claim 1 is characterized in that: A silencer (7) is provided between the fan (4) and the smoke exhaust pipe (5).

7. The medium frequency furnace fume capture system according to claim 1 is characterized in that: The smoke exhaust pipe (5) is provided with a concentration monitoring device.

8. A medium frequency furnace fume capture process, characterized in that: The medium frequency furnace flue gas capture system according to claim 1 is used to capture flue gas, and the process comprises the following steps: Step 1: When the smoke hood moves to the top of an intermediate frequency furnace, the charging car runs to charge the intermediate frequency furnace, and steelmaking is carried out in the smoke hood after the charge is full. When tapping steel, the intermediate frequency furnace pours the molten steel into the ladle car, and the smoke generated during charging, steelmaking and tapping is discharged into the main exhaust pipe through the smoke hood. Step 2: The flue gas enters the spark arrester for secondary spark capture treatment; Step 3: The flue gas after the secondary spark capture treatment enters the bag filter for dust purification; Step 4: The fan introduces the purified flue gas into the exhaust pipe for discharge.

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