A metallurgical furnace kiln flue gas treatment device

Abstract

The utility model provides a kind of metallurgical furnace kiln flue gas treatment device, belong to furnace kiln flue gas treatment technical field, including the initial storehouse being arranged at the flue gas exhaust of furnace kiln, the inner chamber of initial storehouse is sequentially provided with desulfurization component and primary purification component along flue gas flow direction, the outlet of initial storehouse is provided with the flue gas heat exchanger being communicated therewith, the outlet of flue gas heat exchanger is provided with the negative pressure cloth bag dust collector for secondary purification flue gas, after primary purification treatment, so that flue gas enters the inside of flue gas heat exchanger, by booster passage after being discharged by flue gas heat exchanger, enters last negative pressure cloth bag dust collector, last by the flue gas exhaust port being communicated with negative pressure cloth bag dust collector and discharged outside, in the process of booster passage, the effect of flue gas treatment is detected by flue gas analyzer, when reaching standard, flue gas reversing valve will open straight channel, when not reaching standard, channel with filter layer is opened to carry out secondary filtration.

Description

Technical Field

[0001] This utility model relates to the technical field, specifically to a metallurgical furnace flue gas treatment device. Background Technology

[0002] In the metallurgical industry, furnace operations continuously generate a large amount of high-temperature flue gas. This flue gas not only contains harmful sulfides such as sulfur dioxide, but also pollutants such as dust and particulate matter. If it is discharged directly without effective treatment, it will seriously damage the atmospheric environment, aggravate air pollution, and endanger the health of factory workers and surrounding residents. Therefore, the purification and treatment of flue gas from metallurgical furnaces has become a core link in the environmental protection production of the metallurgical industry.

[0003] The related technology (announcement number: CN211753912U) discloses an industrial furnace flue gas purification and treatment equipment. The disclosed technical solution is as follows: the particles in the flue gas are filtered by setting a gauze layer, the moisture in the flue gas is removed by setting a water removal layer to prevent the moisture from affecting the removal of subsequent chemical substances, and the multiple sulfides in the flue gas are oxidized into one sulfide by setting a desulfurization oxidation layer, which facilitates the subsequent removal. The above-disclosed technical solutions have the following problems: In the flue gas transportation process, the desulfurization and purification units are independent and scattered. Flue gas is prone to flow turbulence and insufficient purification during transportation. Conventional static filter plates are prone to filter pore blockage after long-term use and cannot achieve dynamic filtration. At the same time, ordinary pipelines lack pressurization structures, resulting in high flue gas flow resistance and slow flow velocity, which can easily lead to flue gas accumulation and low treatment efficiency. This utility model proposes a metallurgical furnace flue gas treatment device.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background section of this application, and therefore may include prior art information that does not constitute prior art information known to those skilled in the art. Utility Model Content

[0005] This utility model aims to solve at least one of the technical problems existing in the prior art or related technologies. To address the problem of kiln flue gas treatment in the prior art, this utility model provides a metallurgical furnace flue gas treatment device that employs a mechanical pressurization structure combined with a multi-stage purification treatment structure to achieve the effects of environmental protection and improved efficiency. Its specific technical solution is as follows: A flue gas treatment device for metallurgical furnaces includes a primary treatment chamber located at the flue gas exhaust point. The inner cavity of the primary treatment chamber is provided with a desulfurization component and a primary purification component arranged sequentially along the flue gas flow direction. A flue gas heat exchanger is provided at the outlet of the primary treatment chamber and communicates with it. A negative pressure bag filter for secondary purification of the flue gas is provided at the outlet of the flue gas heat exchanger, and the negative pressure bag filter and the flue gas heat exchanger are connected through a pressurization channel. The inner cavity of the air inlet side of the booster channel is configured as two parallel channels, and a filter layer is installed in one of the channels. The inner cavity of the booster channel is equipped with a flue gas reversing valve for switching between the two channels, and a flue gas analyzer connected to the flue gas reversing valve is installed at the inlet of the booster channel.

[0006] In the above technical solution, an air inlet pipe is fixedly connected to the outlet of the flue gas heat exchanger and is connected to the pressurization channel. A blind pipe is fixedly connected to the inlet of the negative pressure bag dust collector and is connected to the pressurization channel. A sealing partition fixed to the inner wall of the pressurization channel is evenly arranged between the closed end of the blind pipe and the air inlet pipe, and several of the sealing partitions divide the pressurization channel into two parallel channels.

[0007] The flue gas reversing valve includes a baffle plate rotatably disposed at the closed end of the blind pipe. The baffle plate has circumferentially evenly spaced guide holes, and each of the two non-orthogonally opposite guide holes is fitted with a filter layer for covering one of the channels. The outer wall of the pressurization channel is provided with a reversing drive component for driving the baffle plate to rotate, and the reversing drive component is connected to the flue gas analyzer.

[0008] The reversing drive component includes a groove formed on the outer wall of the boosting channel, and the length of the groove corresponds to the circumference of the guide hole. A transmission rod fixed to the outer wall of the baffle plate is slidably arranged in the inner cavity of the groove. A driven ring covering the outside of the groove is sleeved on the outer wall of the boosting channel, and the transmission rod is fixed to the inner wall of the driven ring. A drive wheel that fits against the outer wall of the driven ring is provided on the outer wall of the boosting channel.

[0009] The outer wall of the blind tube has eccentric holes on both sides located in the inner cavity of the pressurization channel, and the inner wall of the closed end of the blind tube is rotatably equipped with a pressurization wheel located on the flow path of the eccentric hole.

[0010] The desulfurization assembly includes a desulfurization catalyst layer fixed to the inner cavity of the primary storage chamber, and the desulfurization catalyst layer covers the inner wall of the inlet of the primary storage chamber. A guide slope is provided at the bottom corner of the inner wall of the primary storage chamber, and an ammonia injection pipe is provided on the side wall of the guide slope toward the desulfurization catalyst layer. An ash hopper is provided at the bottom of the primary storage chamber between the desulfurization catalyst layer and the ammonia injection pipe.

[0011] The primary purification component includes a double-layer flow port located at the upper part of the inner cavity of the primary chamber, and a filter plate is slidably disposed at each side of the double-layer flow port. The side wall of the primary chamber is provided with a cross-filtering component that drives the two filter plates to move back and forth in opposite directions.

[0012] The cross-filtering component includes connecting seats respectively disposed on the side walls of the two filter plates, and both connecting seats are disposed on the initial chamber by means of elastic reset members. An elliptical turntable is rotatably disposed between the two connecting seats, and the two connecting seats are symmetrically attached to the circumferential sides of the elliptical turntable.

[0013] The elastic reset component includes slide rods fixed to opposite sides of the two connecting seats respectively. A limiting plate is fixed to the other end of the slide rod, and the slide rod extends out of the initial placement chamber. An elastic element sleeved on the outer wall of the slide rod is provided between the limiting plate and the outer wall of the initial placement chamber.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. The pressurization channel is equipped with an eccentric hole and a pressurization wheel structure. It uses flue gas convection to achieve mechanical pressurization, which effectively reduces the resistance of flue gas flow, accelerates the flue gas delivery speed, eliminates the problem of flue gas accumulation, and improves the overall processing efficiency of the whole set of equipment.

[0015] Second, the primary purification component adopts a filter plate structure that can move back and forth. It relies on the cross-filter components composed of an elliptical turntable and elastic reset parts to drive the filter plate to work dynamically. Compared with traditional static filter plates, it can effectively prevent filter hole clogging, extend the service life of filter plates, ensure long-term stable operation of primary dust removal, and reduce the frequency of manual maintenance and replacement.

[0016] III. The flue gas analyzer monitors flue gas indicators in real time and automatically switches the flow channel based on the test results: when the flue gas meets the standards, it flows through a straight channel, reducing filter material consumption and equipment operating load; when the flue gas exceeds the standards, it automatically switches to a channel with a filter layer to complete secondary filtration, providing double protection that flue gas emissions meet environmental standards. The reversing valve relies on gear transmission, driven ring, and transmission rod to achieve rotational adjustment. The transmission structure is stable and the control is precise, allowing for long-term reliable operation in dusty flue gas environments with low failure rates.

[0017] IV. The primary chamber integrates desulfurization and primary purification components. Flue gas undergoes desulfurization and primary dust removal sequentially along a fixed flow direction. The layout is compact and reasonable, ensuring smooth flue gas transport and improving the pretreatment effect of flue gas from the source. The desulfurization component adopts a desulfurization mode of ammonia injection combined with a desulfurization catalyst layer, and is equipped with a guide slope to guide the flue gas to fully contact and react, resulting in thorough desulfurization. An ash hopper is set at the bottom to collect the waste residue generated by desulfurization in a timely manner, facilitating centralized cleaning. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the structure of a metallurgical furnace flue gas treatment device according to the present invention. Figure 2 This is a structural cross-sectional view of the initial storage compartment of this utility model; Figure 3 This is a schematic diagram of the internal structure of the initial storage chamber of this utility model; Figure 4 This is a schematic diagram of the pressurization pipeline section of this utility model; Figure 5 This is a cross-sectional view of the pressurization pipeline section of this utility model; Figure 6 for Figure 5 Enlarged view of a portion at point A; Figure 7 This is a partial structural diagram of the internal structure of the pressurization pipeline of this utility model; Figure 8 This is a schematic diagram of the flow-blocking plate part of this utility model; in, Figures 1 to 8 The correspondence between the reference numerals and component names in the attached drawings is as follows: 1. Primary storage chamber; 2. Desulfurization assembly; 3. Primary purification assembly; 4. Flue gas heat exchanger; 5. Negative pressure bag filter; 6. Pressurization channel; 61. Inlet pipe; 62. Blind pipe; 621. Eccentric hole; 622. Pressurization wheel; 63. Enclosed baffle; 7. Flue gas reversing valve; 71. Baffle plate; 72. Guide hole; 73. Filter layer; 74. Reversing drive mechanism Components; 741, chute; 742, transmission rod; 743, driven ring; 744, driving wheel; 8, flue gas analyzer; 21, desulfurization catalyst layer; 22, guide slope; 23, ammonia injection pipe; 24, ash hopper; 31, double-layer flow port; 32, filter plate; 33, cross-filter component; 331, connecting seat; 332, elastic reset component; 3321, slide bar; 3322, limiting plate; 333, elliptical turntable. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] The following are specific implementation cases and appendices. Figure 1-8 The present invention will be further described below, but the present invention is not limited to these embodiments.

[0021] A flue gas treatment device for metallurgical furnaces includes a primary treatment chamber 1 located at the furnace exhaust outlet. A desulfurization component 2 and a primary purification component 3 are sequentially arranged within the inner cavity of the primary treatment chamber 1 along the flue gas flow direction. The primary treatment chamber 1 has a right-angled trapezoidal cross-section and three independent flue gas inlets. Each of the three inlets has connection holes on its surface, allowing selective use of the inlets. When an inlet is not in use, a sealing plate can be fixed to it with bolts. The desulfurization component 2 covers the flue gas inlets, enabling primary purification of the flue gas after treatment by the desulfurization component 2.

[0022] A flue gas heat exchanger 4 is installed at the outlet of the primary chamber 1 and is connected to it. A negative pressure bag filter 5 for secondary purification of flue gas is installed at the outlet of the flue gas heat exchanger 4, and the negative pressure bag filter 5 and the flue gas heat exchanger 4 are connected through a pressurization channel 6.

[0023] After primary purification, the flue gas enters the flue gas heat exchanger 4, and after being discharged from the flue gas heat exchanger 4, it enters the final negative pressure bag filter 5 through the pressurization channel 6. Finally, it is discharged to the outside through the exhaust port connected to the negative pressure bag filter 5. The waste heat of the flue gas is used in the flue gas heat exchanger 4. The flue gas flow efficiency is improved by the mechanical pressurization channel 6. After the flue gas is treated step by step, it avoids causing environmental impact.

[0024] The inner cavity of the inlet side of the pressurization channel 6 is configured as two parallel channels, one of which contains a filter layer 73. The inner cavity of the pressurization channel 6 is equipped with a flue gas reversing valve 7 for switching between the two channels, and a flue gas analyzer 8 connected to the reversing valve 7 is installed at the inlet of the pressurization channel 6. During the passage of gas through the pressurization channel 6, the flue gas analyzer 8 monitors the effectiveness of the flue gas treatment. When the standard is met, the reversing valve 7 opens the straight channel; when the standard is not met, the channel with the filter layer 73 opens for secondary filtration.

[0025] Among them, the outlet of the flue gas heat exchanger 4 is fixedly connected to the inlet pipe 61, which is connected to the pressurization channel 6. The pressurization channel 6 is sleeved on the outside of the inlet pipe 61 and the blind pipe 62. The inlet of the negative pressure bag dust collector 5 is fixedly connected to the blind pipe 62, which is connected to the pressurization channel 6. The closed end of the blind pipe 62 and the inlet pipe 61 are evenly provided with the sealing partition 63 fixed to the inner wall of the pressurization channel 6, and several sealing partitions 63 divide the pressurization channel 6 into two parallel channels.

[0026] The pressurization channel 6 is divided into four independent spaces by four closed partitions 63. Two diagonally opposite spaces form a channel, so that the four independent spaces inside the pressurization channel 6 form two channels. One end of the inlet pipe 61 is sealed to the outlet of the flue gas heat exchanger 4, and the other end of the inlet pipe 61 extends into the interior of the pressurization channel 6, so that the flue gas discharged from the flue gas heat exchanger 4 enters the interior of the blind pipe 62 through the pressurization channel 6, and after pressurization, it enters the interior of the negative pressure bag filter 5 through the blind pipe 62.

[0027] It is worth noting that the flue gas reversing valve 7 includes a baffle plate 71 rotatably mounted at the closed end of the blind pipe 62. One end of the blind pipe 62 is closed, and the other end is connected to the negative pressure bag filter 5. The baffle plate 71 rotates against the closed end of the blind pipe 62 and rotates inside the pressurization channel 6. The baffle plate 71 seals and obstructs the flow by dividing the closed partition 63 into four independent spaces. The baffle plate 71 has circumferentially evenly spaced guide holes 72, and each of the two non-orthogonally opposite guide holes 72 is fitted with a filter layer 73 to cover one of the channels. The outer wall of the pressurization channel 6 is provided with a reversing drive component 74 for driving the baffle plate 71 to rotate, and the reversing drive component 74 is connected to the flue gas analyzer 8.

[0028] The baffle plate 71 has flow guide holes 72 that are connected to the four independent spaces of the closed partition plate 63. The filter layer 73 is embedded in the two diagonally opposite flow guide holes 72. The baffle plate 71 is driven to rotate by the reversing drive component 74, so that the baffle plate 71 adjusts the flow channel of the flue gas. The filter layer 73 is selected according to the detection results of the flue gas analyzer 8.

[0029] Furthermore, the reversing drive component 74 includes a groove 741 formed on the outer wall of the boosting channel 6, and the length of the groove 741 corresponds to the circumference of the guide hole 72. The circumference of the groove 741 is the same as that of each individual guide hole 72, that is, the circumference of the groove 741 is one-quarter of the circumference. A transmission rod 742 fixed to the outer wall of the baffle plate 71 is slidably arranged in the inner cavity of the groove 741. A driven ring 743 covering the outside of the groove 741 is sleeved on the outer wall of the boosting channel 6, and the transmission rod 742 is fixed to the inner wall of the driven ring 743. A drive wheel 744 that fits against the outer wall of the driven ring 743 is provided on the outer wall of the boosting channel 6.

[0030] The driven ring 743 rotates against the outer wall of the pressurization channel 6, covering the slide groove 741. One end of the transmission rod 742 is fixed to the circumferential outer wall of the baffle plate 71, and the other end is fixed to the inner wall of the driven ring 743. Rotating the driven ring 743 causes the transmission rod 742 to drive the baffle plate 71 to rotate, thereby adjusting the position of the filter layer 73. A motor is fixed at the bottom of the outer wall of the pressurization channel 6. A drive wheel 744 is sleeved on the outer wall of the motor's output shaft. A rubber ring for pressurizing friction is sleeved on the circumferential outer wall of the drive wheel 744. The drive wheel 744 drives the driven ring 743 to rotate.

[0031] In addition, eccentric holes 621 are provided on both sides of the outer wall of the blind pipe 62, located in the inner cavity of the pressurization channel 6. A pressurization wheel 622 is rotatably installed on the inner wall of the closed end of the blind pipe 62, which is located on the flow path of the eccentric holes 621. The flue gas enters the interior of the blind pipe 62 through the eccentric holes 621 on both sides, and the eccentric convection drives the pressurization wheel 622 to rotate, thereby achieving the effect of pressurization.

[0032] Two sets of obliquely opposite eccentric holes 621 are opened on both sides of the outer wall of the pressurization channel 6. The two eccentric holes 621 correspond to two obliquely opposite guide holes 72 respectively. When the two filter layers 73 on the baffle plate 71 rotate to the channel connected by the eccentric holes 621, they filter the flue gas. When the two straight holes on the baffle plate 71 rotate to the channel connected by the eccentric holes 621, the flue gas directly enters the interior of the negative pressure bag dust collector 5.

[0033] Furthermore, the desulfurization assembly 2 includes a desulfurization catalyst layer 21 fixed within the inner cavity of the primary treatment chamber 1, and the desulfurization catalyst layer 21 covers the inner wall of the inlet of the primary treatment chamber 1. A guide slope 22 is provided at the bottom corner of the inner wall of the primary treatment chamber 1, and an ammonia injection pipe 23 is provided on the side wall of the guide slope 22, facing the desulfurization catalyst layer 21. Nozzles are evenly arranged on the ammonia injection pipe 23, and the nozzles spray ammonia towards the desulfurization catalyst layer 21. An ash hopper 24 is provided at the bottom of the primary treatment chamber 1, located between the desulfurization catalyst layer 21 and the ammonia injection pipe 23. A valve is provided on the ash hopper 24, and the guide slope 22 guides the flow of flue gas and directs the flow of the desulfurized flue gas.

[0034] After the kiln flue gas enters the initial storage chamber 1, the nozzles on the ammonia injection pipe 23 inject ammonia onto the desulfurization catalyst layer 21, thereby desulfurizing the flue gas.

[0035] The primary purification component 3 includes a double-layered flow port 31 located at the upper part of the inner cavity of the primary chamber 1, with a filter plate 32 slidably installed at each side of the double-layered flow port 31. The side wall of the primary chamber 1 is provided with a cross-filtering component 33 that drives the two filter plates 32 to move back and forth in opposite directions. After desulfurization treatment, the flue gas undergoes primary filtration through the two reciprocatingly moving filter plates 32.

[0036] The cross-filtration component 33 includes connecting seats 331 respectively disposed on the side walls of the two filter plates 32. Both connecting seats 331 are mounted on the primary chamber 1 via elastic reset members 332. An elliptical turntable 333 is rotatably disposed between the two connecting seats 331, and the two connecting seats 331 are symmetrically attached to the circumferential sides of the elliptical turntable 333. A motor is fixed on the outer wall of the primary chamber 1, and the output shaft of the motor extends into the interior of the primary chamber 1. The elliptical turntable 333 is fixedly sleeved on the outer wall of the motor output shaft through a central mounting hole.

[0037] The elastic reset member 332 includes a slide rod 3321 fixed to the opposite sides of two connecting seats 331 respectively. The other end of the slide rod 3321 is fixed with a limiting plate 3322, and the slide rod 3321 extends out of the outside of the initial placement chamber 1. An elastic member sleeved on the outer wall of the slide rod 3321 is provided between the limiting plate 3322 and the outer wall of the initial placement chamber 1.

[0038] The double-layer flow port 31 consists of two partition plates, which are fixed parallel to each other inside the primary storage chamber 1. The partition plates have through holes located above the desulfurization catalyst layer 21 and the ammonia injection pipe 23. Each partition plate has a sandwich layer in the middle, and the filter plate 32 slides inside the sandwich layer. The side wall of the filter plate 32 is fixedly connected to the connecting seat 331 by a connecting rod. The connecting seat 331 and the connecting rod form a T-shaped anti-fall-off structure. One end of the slide rod 3321 is fixed to one side of the connecting seat 331, and the other end of the slide rod 3321 extends to the outside after passing through the side wall of the primary storage chamber 1 along the horizontal direction of the filter plate 32. A limiting plate 3322 is fixedly installed at the end of the slide rod 3321 outside the primary storage chamber 1. The elastic element is a compression spring, and the two ends of the elastic element are fixed to the limiting plate 3322 and the outer wall of the primary storage chamber 1, respectively. At the same time, the elastic element is sleeved on the outside of the slide rod 3321.

[0039] As the elliptical turntable 333 rotates, after half a revolution, it simultaneously pushes the connecting seats 331 on both sides to move. This causes the connecting seats 331 to move the filter plates 32 and the sliding rods 3321. At the same time, the elastic element is compressed and generates elastic force, causing the two filter plates 32 to slide against each other on the two openings of the double-layer flow port 31. When the elliptical turntable 333 rotates another half revolution, it disengages from the two connecting seats 331. At this time, the limiting plate 3322 pushes the connecting seats 331 back to their original position through the elastic force of the elastic element. This causes the connecting seats 331 to move the filter plates 32 back to their original position. As the elliptical turntable 333 continues to rotate, the two filter plates 32 move back and forth against each other continuously, allowing the flue gas to pass evenly over the surfaces of the two filter plates 32.

[0040] This embodiment is a metallurgical furnace flue gas treatment device. The working principle is as follows: after the flue gas enters the primary storage chamber 1 from the metallurgical furnace, it first undergoes desulfurization through the ammonia injection pipe 23 in conjunction with the desulfurization catalyst layer 21. Then, the filter plate 32 is driven to reciprocate by the cross-filter component 33 to achieve primary purification. The flue gas then flows into the flue gas heat exchanger 4 to recover waste heat, and then enters the pressurization channel 6 through the inlet pipe 61. The eccentric hole 621 and the pressurization wheel 622 in the channel create a flue gas pressurization effect. The flue gas analyzer 8 detects the flue gas indicators in real time and controls the flue gas reversing valve 7 to switch the flow channel according to the detection results: if the flue gas meets the standard, it flows through the straight flow channel; if it does not meet the standard, it flows through the flow channel with the filter layer 73 for secondary filtration. Finally, the flue gas merges into the negative pressure bag dust collector 5 to complete deep purification and is discharged from the exhaust port.

[0041] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] Furthermore, the terms “first,” “second,” “third,” and “fourth” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as “first,” “second,” “third,” or “fourth” may explicitly or implicitly include at least one of those features.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flue gas treatment device for metallurgical furnaces and kilns, characterized in that, The system includes a primary silo (1) located at the flue gas exhaust point of the furnace. The internal cavity of the primary silo (1) is provided with a desulfurization component (2) and a primary purification component (3) in sequence along the flue gas flow direction. A flue gas heat exchanger (4) is provided at the outlet of the primary silo (1) and is connected to it. A negative pressure bag filter (5) for secondary purification of flue gas is provided at the outlet of the flue gas heat exchanger (4). The negative pressure bag filter (5) and the flue gas heat exchanger (4) are connected through a pressurization channel (6). The inner cavity of the pressurization channel (6) on the air inlet side is configured as two parallel channels, and a filter layer (73) is provided in one of the channels. The inner cavity of the pressurization channel (6) is provided with a flue gas reversing valve (7) for switching between the two channels, and a flue gas analyzer (8) connected to the flue gas reversing valve (7) is provided at the inlet of the pressurization channel (6).

2. The metallurgical furnace flue gas treatment device according to claim 1, characterized in that: The outlet of the flue gas heat exchanger (4) is fixedly connected to the inlet pipe (61) which is opposite to the pressurization channel (6). The inlet of the negative pressure bag dust collector (5) is fixedly connected to the blind pipe (62) which is opposite to the pressurization channel (6). The closed end of the blind pipe (62) and the inlet pipe (61) are evenly provided with a closed partition (63) fixed to the inner wall of the pressurization channel (6). Several of the closed partitions (63) divide the pressurization channel (6) into two parallel channels.

3. The metallurgical furnace flue gas treatment device according to claim 2, characterized in that: The flue gas reversing valve (7) includes a baffle plate (71) rotatably disposed at the closed end of the blind pipe (62). The baffle plate (71) is provided with circumferentially uniform guide holes (72), and each of the two non-orthogonally opposite guide holes (72) is fitted with a filter layer (73) for covering one of the channels. The outer wall of the pressurization channel (6) is provided with a reversing drive component (74) for driving the baffle plate (71) to rotate, and the reversing drive component (74) is connected to the flue gas analyzer (8).

4. The metallurgical furnace flue gas treatment device according to claim 3, characterized in that: The reversing drive component (74) includes a groove (741) formed on the outer wall of the boosting channel (6), and the length of the groove (741) corresponds to the circumference of the guide hole (72). The inner cavity of the groove (741) is slidably provided with a transmission rod (742) fixed to the outer wall of the baffle plate (71). The outer wall of the boosting channel (6) is sleeved with a driven ring (743) covering the outside of the groove (741), and the transmission rod (742) is fixed to the inner wall of the driven ring (743). The outer wall of the boosting channel (6) is provided with a drive wheel (744) that fits against the outer wall of the driven ring (743).

5. The metallurgical furnace flue gas treatment device according to claim 4, characterized in that: The blind tube (62) has eccentric holes (621) on both sides of its outer wall located in the inner cavity of the pressurization channel (6). The inner wall of the closed end of the blind tube (62) is rotatably provided with a pressurization wheel (622) located on the flow path of the eccentric hole (621).

6. The metallurgical furnace flue gas treatment device according to claim 1, characterized in that: The desulfurization assembly (2) includes a desulfurization catalyst layer (21) fixed in the inner cavity of the primary storage chamber (1), and the desulfurization catalyst layer (21) covers the inner wall of the inlet of the primary storage chamber (1). A guide slope (22) is provided at the bottom corner of the inner wall of the primary storage chamber (1). An ammonia injection pipe (23) is provided on the side wall of the guide slope (22) facing the desulfurization catalyst layer (21). An ash hopper (24) is provided at the bottom of the primary storage chamber (1) between the desulfurization catalyst layer (21) and the ammonia injection pipe (23).

7. The metallurgical furnace flue gas treatment device according to claim 1, characterized in that: The primary purification component (3) includes a double-layer flow port (31) located at the upper part of the inner cavity of the primary chamber (1), and a filter plate (32) is slidably provided at each side of the double-layer flow port (31). The side wall of the primary chamber (1) is provided with a cross filter component (33) that drives the two filter plates (32) to move back and forth in opposite directions.

8. The metallurgical furnace flue gas treatment device according to claim 7, characterized in that: The cross-filter component (33) includes connecting seats (331) respectively disposed on the side walls of the two filter plates (32), and both connecting seats (331) are disposed on the initial chamber (1) through elastic reset members (332). An elliptical turntable (333) is rotatably disposed between the two connecting seats (331), and the two connecting seats (331) are symmetrically attached to the circumferential sides of the elliptical turntable (333).

9. The metallurgical furnace flue gas treatment device according to claim 8, characterized in that: The elastic reset member (332) includes a slide rod (3321) fixed to the back side of the two connecting seats (331), the other end of the slide rod (3321) is fixed with a limiting plate (3322), and the slide rod (3321) extends out of the outside of the initial placement chamber (1). An elastic member sleeved on the outer wall of the slide rod (3321) is provided between the limiting plate (3322) and the outer wall of the initial placement chamber (1).

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