A composite smoke collecting duct for rock wool electric melting furnace

Abstract

The utility model discloses a kind of composite smoke collection pipelines for rock wool electric smelting furnace, outlet pipe one is connected with first branch pipe and is intersected 140 °, outlet pipe two and second branch pipe are connected and are intersected 145 °, first branch pipe and second branch pipe intersect and merge into main pipeline, main pipeline is vertically upwards, main pipeline and first branch pipe intersect 145 °;Manhole door and filter are respectively arranged above first branch pipe and second branch pipe;Optimize composite smoke collection pipeline system, set up double-outlet flue and the bending angle of composite smoke collection pipeline, reduce system resistance, beneficial to the flue gas of electric smelting furnace more smoothly discharge;Filter and quick-opening manhole door are set, facilitate cleaning composite smoke collection pipeline internal dust;Composite smoke collection pipeline is composed of 304 stainless steel pipe and chrome molybdenum tungsten alloy layer, with wear resistance, corrosion resistance characteristics, also have higher mechanical strength and impact resistance, can cope with the scouring and abrasion of high-temperature flue dust generated in electric smelting furnace to smoke collection pipeline, greatly prolong the service life of composite smoke collection pipeline.

Description

Technical Field

[0001] This utility model belongs to the field of rock wool production technology, specifically relating to a composite smoke collection pipe for rock wool electric melting furnace. Background Technology

[0002] An electric melting furnace is a device that uses electricity as an energy source to melt raw materials in the rock wool manufacturing process. During the operation of the electric melting furnace, a large amount of smoke and dust (including metal vapor, dust, and harmful gases) is generated inside the furnace, which needs to be collected in a timely manner through a pipeline system and subsequently purified. Therefore, a smoke collection pipe needs to be installed on the furnace cover of the electric melting furnace. During operation, the smoke collection pipe will also generate a certain negative pressure, which is conducted into the furnace cavity, keeping the entire furnace cavity under a slight negative pressure. The existence of a slight negative pressure has two effects: firstly, it confines the harmful substances generated during the melting process inside the furnace cavity, preventing them from leaking out through the gaps in the furnace top, thus avoiding personal safety hazards and environmental pollution; secondly, it also plays a role in preventing the electric furnace from exploding.

[0003] The currently used smoke collection pipes are made of 316 stainless steel. They are single-channel smoke collection pipes with unreasonable bending angles and configurations. During operation, due to long-term contact with high-temperature waste dust (containing corrosive nitrogen oxides and sulfides), high-temperature gases (reaching over 600°C), and the scouring of high-temperature dust particles, the smoke collection pipe walls are easily corroded and worn, resulting in thinning of the pipe walls, the formation of holes, and smoke leakage. This reduces the smoke collection function of the pipes, and the accumulation of ash inside the pipes makes cleaning inconvenient and affects the normal operation of the electric furnace. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides a composite smoke collection pipe for rock wool electric melting furnaces. It features a rationally designed dual-outlet flue and bend angle, and includes filters and manholes. The composite smoke collection pipe is composed of an outer layer of 304 stainless steel pipe and an inner layer of chromium-molybdenum-tungsten alloy welded onto it. It possesses wear-resistant and corrosion-resistant properties, as well as high mechanical strength and impact resistance. This allows it to withstand the scouring and wear caused by high-temperature flue gas and dust generated inside the electric melting furnace, enabling stable operation in high-temperature, corrosive, and scouring environments, significantly extending its service life.

[0005] The technical solution adopted by this utility model is as follows: a composite smoke collection pipe for a rock wool electric melting furnace. A furnace cover is fixedly installed on the upper end of the electric melting furnace. Two air outlets are provided on the upper end of the furnace cover. A composite smoke collection pipe connecting to the inside of the melting furnace is fixedly installed on the air outlets. The composite smoke collection pipe includes an outlet pipe one and an outlet pipe two, which are respectively connected to the two air outlets on the top of the furnace cover of the electric melting furnace. The outlet pipe one is connected to a first branch pipe and intersects with it at 140°. The outlet pipe two is connected to a second branch pipe and intersects with it at 145°. The first branch pipe and the second branch pipe intersect at 65° and merge into a main pipe. The main pipe is vertically upward and intersects with the first branch pipe at 145°. A manhole door and a filter are respectively provided on the first branch pipe and the second branch pipe. The filter is located at the front end of the manhole door.

[0006] The composite smoke collection duct consists of two layers: an outer layer of 304 stainless steel pipe and an inner layer of chromium-molybdenum-tungsten wear-resistant alloy; the thickness of the chromium-molybdenum-tungsten wear-resistant alloy layer is 4-6 mm.

[0007] At the bends and turns of the outlet pipe 1 and the first branch pipe, the outlet pipe 2 and the second branch pipe, and the main pipe and the first branch pipe, a chromium-molybdenum-tungsten wear-resistant alloy layer with a thickness of 5-6mm is added to the inside of the composite smoke collection pipe.

[0008] The manhole is installed at the opening on the outer wall of the first and second branch pipes. An elongated oval manhole is opened on the outer wall of the first and second branch pipes. The cover plate of the manhole is an elongated arc plate. An installation block is fixed on one side of the pipe wall of the manhole opening, and a clamping device is fixed on the other side of the pipe wall corresponding to the manhole opening. A fastening strip with the same curvature as the manhole cover plate is inserted into the groove of the installation block and fixed in the through hole by bolts. An installation block is fixed in the middle of the manhole cover plate, and the middle part of the fastening strip is fixed by the installation block. The other end of the fastening strip is connected to the clamping device.

[0009] The cover plate of the manhole door is larger than the opening size of the oblong manhole. A sealing groove is provided around the manhole door cover plate, and a sealing strip is provided between the manhole door cover plate and the outer wall of the manhole opening. A handle is also fixedly provided on the manhole door cover plate.

[0010] One end and the middle of the fastening strip are provided with through holes, and the other end of the fastening strip is fixed with a clamping block with an inner groove; at least three fastening strips are provided, respectively at the upper, middle and lower positions of the manhole cover plate, and the fastening strips are pressed against the outside of the manhole cover plate along the circumference of the pipe by the mounting block and the pressing device.

[0011] The mounting block has a through hole along the axial center of the pipe, and an arc-shaped groove along the circumference of the pipe, with the groove perpendicular to the direction of the through hole.

[0012] The clamping device includes a clamping ring, a clamping shaft, a guide block, and a clamping fixing block. The guide block and the clamping fixing block are fixedly welded to the pipe sidewall on one side of the manhole opening at intervals. A through hole is longitudinally provided in the guide block. The clamping shaft passes through the through hole of the guide block. A square clamping ring is rotatably provided in the through hole at the front end of the clamping shaft. The rear end of the clamping shaft is riveted to one end of a hinge plate. The other end of the hinge plate is riveted to the lower middle part of the clamping handle. The lower part of the clamping handle is connected to the clamping fixing block by a pin.

[0013] The filter is installed on the composite smoke collection pipe at the front end of the manhole door via a flange. The filter is equipped with 1-2 filter screens, which are easy to disassemble and clean. The internal filter element can also be removed and replaced at the manhole.

[0014] The composite smoke collection pipe includes outlet pipe one and outlet pipe two, which are respectively connected to two air outlets on the top of the electric furnace cover. The purpose of this arrangement is to connect outlet pipe one and outlet pipe two to the two outlet positions of the electric furnace cover, and to connect outlet pipe one and outlet pipe two to the first branch pipe and the second branch pipe respectively. By using the two branch pipes, the pressure inside the electric furnace is collected at two points, resulting in more uniform internal pressure and better smoke collection effect.

[0015] The first outlet pipe is connected to the first branch pipe and intersects at 140°. The second outlet pipe is connected to the second branch pipe and intersects at 145°. The first and second branch pipes intersect at 65° and merge into the main pipe. The main pipe is vertically upward and intersects the first branch pipe at 145°. The purpose of this arrangement is to set a certain inclination angle between the first outlet pipe, the second outlet pipe, the first branch pipe, the second branch pipe, and the main pipe, thereby optimizing the design of the flue gas exhaust system, reducing the system resistance of the flue gas collection pipe, facilitating the smoother discharge of flue gas from the electric furnace, reducing scouring resistance, and improving operating efficiency.

[0016] The composite smoke collection duct consists of two layers: an outer layer of 304 stainless steel pipe and an inner layer of chromium-molybdenum-tungsten wear-resistant alloy. The thickness of the chromium-molybdenum-tungsten wear-resistant alloy layer is 4-6 mm. The purpose of this design is that the smoke collection duct is composed of two composite layers. The outer layer uses 304 stainless steel pipe as the base layer, and the inner layer is formed by overlaying chromium-molybdenum-tungsten wear-resistant alloy material on the inside of the 304 stainless steel pipe, forming a good metallurgical bond. The 304 stainless steel pipe has excellent corrosion resistance. The chromium element present in it can form a dense chromium oxide passivation film on the steel surface, isolating oxygen and corrosive media, thus providing protection. This allows it to withstand the harsh environment of corrosion and high temperature around the electric furnace, and its short-term temperature resistance can reach 1000-1200 degrees Celsius, while its long-term operating temperature can reach up to 650 degrees Celsius, which is suitable for the exhaust working temperature of rock wool electric melting furnaces. A high-hardness chromium-molybdenum-tungsten alloy layer is formed on the inner side of the stainless steel pipe through overlay welding as the inner layer of the smoke collection pipe. The chromium-molybdenum-tungsten alloy contains approximately 45% M7C3 type hard carbides. These carbides have a rod-like structure and high toughness. Simultaneously, the microhardness of the carbides is very high (Hv1500-1800), and the macrohardness of the wear-resistant layer is above HRC55, improving the inner layer's resistance to erosion by high-temperature dust. Therefore, the composite smoke collection pipe composed of 304 stainless steel pipe and its overlaid chromium-molybdenum-tungsten alloy inner layer possesses wear resistance, corrosion resistance, high mechanical strength, and high impact resistance. It exhibits excellent comprehensive performance, capable of withstanding the erosion and wear of the smoke collection pipe caused by high-temperature flue gas and dust generated inside the electric furnace, adapting to both internal and external working environments, and significantly extending the service life of the composite smoke collection pipe.

[0017] This composite smoke collection pipe structure can be widely used in corrosion-resistant and wear-resistant industrial pipelines, solving the problem of easy wear in corrosion-resistant and wear-resistant industrial conveying pipelines and the difficulty of composite pipes with bends. Because the inner layer is made of chromium-molybdenum-tungsten wear-resistant alloy material welded to the inside of the 304 stainless steel pipe, a good metallurgical bond is formed. Bends and other various irregularly shaped pipes can be integrally composited without changing the material's movement trajectory within the bend. The pipeline system has low operating resistance and low energy consumption. Since the inner and outer layers of the bimetallic composite pipe have similar coefficients of thermal expansion, the inner layer of the wear-resistant pipe will not crack or peel off due to inconsistent expansion or contraction during rapid temperature changes or welding, preventing premature failure. It also has good thermal shock resistance. Bimetallic composite pipes can be installed using flanges, quick-connect fittings, direct welding, etc., making transportation, installation, and use convenient. Due to the high impact resistance of the bimetallic composite pipe, in the event of local blockage in the pipeline system, it can be easily knocked or hammered to clean the accumulated dust and debris inside.

[0018] Manholes and filters are respectively installed on the first and second branch pipes, with the filters located at the front end of the manholes. The purpose of this arrangement is to facilitate the periodic manual cleaning of dust accumulated in the branch pipes by installing manholes on the first and second branch pipes, which have an inclined angle, thus ensuring the permeability of the smoke collection pipes.

[0019] A mounting block is fixedly installed in the middle of the manhole cover plate, and the middle part of the fastening strip is fixed by the mounting block. The other end of the fastening strip is connected to a clamping device. The clamping device includes a clamping ring, a pressure shaft, a guide block, and a clamping fixing block. The guide block and the clamping fixing block are fixedly welded to the pipe sidewall on one side of the manhole opening at intervals. A through hole is longitudinally provided in the guide block, and the pressure shaft passes through the through hole of the guide block. A square clamping ring is rotatably installed in the through hole at the front end of the pressure shaft. The rear end of the pressure shaft is riveted to one end of a hinge plate, and the other end of the hinge plate is connected to a clamping handle. The lower part of the clamping handle is riveted and fixed, and the lower part of the clamping handle is connected to the clamping block by a pin. The purpose of this setting is that pressing or lifting the clamping handle will drive the hinge plate to move, and at the same time drive the pressure shaft at the front end of the hinge plate to move horizontally through the guide block, which will drive the clamping ring at the front end of the pressure shaft to move back and forth. The clamping ring will engage in the inner groove of the clamping block at the end of the fastening strip to complete the work of fixing or loosening the fastening strip. That is, pressing or lifting the clamping handle can quickly clamp or loosen one end of the fastening strip, which is convenient for quickly closing or opening the manhole door and improving work efficiency.

[0020] The beneficial effects of this utility model are as follows: The overall design of the composite smoke collection pipe is scientific and reasonable, with a compact structure. The optimized design of the dual-outlet flue and the bending angle of the composite smoke collection pipe system reduces system resistance, facilitating smoother exhaust of flue gas from the electric furnace, reducing scouring resistance, and improving operating efficiency. The inclusion of a filter and a quick-opening manhole facilitates cleaning of dust inside the composite smoke collection pipe. The composite smoke collection pipe is composed of an outer layer of 304 stainless steel pipe and an inner layer of chromium-molybdenum-tungsten alloy, possessing wear-resistant and corrosion-resistant properties, as well as high mechanical strength and impact resistance. This allows it to withstand the scouring and wear caused by high-temperature flue gas dust generated inside the electric furnace, enabling stable operation in high-temperature, corrosive, and scouring environments, significantly extending the service life of the composite smoke collection pipe and improving the smoke collection performance of the electric furnace. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the composite smoke collection pipe of this utility model;

[0022] Figure 2 This is a schematic cross-sectional view of the manhole of the composite smoke collection pipe of this utility model.

[0023] Figure 3 This is a schematic diagram of the overall structure of the manhole door for the composite smoke collection pipe of this utility model;

[0024] Figure 4 This is a schematic diagram of the composite smoke collection pipe pressing device of this utility model.

[0025] Markings in the diagram: 1. Outlet pipe one; 2. Outlet pipe two; 3. First branch pipe; 4. Second branch pipe; 5. Main pipe; 6. Manhole door; 7. Filter; 8. 304 stainless steel pipe; 9. Chromium-molybdenum-tungsten wear-resistant alloy layer; 10. Cover plate; 11. Manhole; 12. Sealing groove; 13. Mounting block; 14. Fastening strip; 15. Clamping block; 16. Pressing device; 17. Clamping ring; 18. Pressure shaft; 19. Guide block; 20. Pressing and fixing block; 21. Hinge plate; 22. Pressing handle; 23. Handle. Detailed Implementation

[0026] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0027] like Figure 1-4 As shown, a composite smoke collection pipe for a rock wool electric melting furnace is provided. A furnace cover is fixedly installed at the upper end of the furnace, and two air outlets are provided at the upper end of the furnace cover. A composite smoke collection pipe connecting to the inside of the furnace is fixedly installed on the air outlets. The composite smoke collection pipe includes an outlet pipe 1 and an outlet pipe 2, which are respectively connected to the two air outlets at the top of the furnace cover. The outlet pipe 1 is connected to the first branch pipe 3 and intersects it at 140°. The outlet pipe 2 is connected to the second branch pipe 4 and intersects it at 145°. The first branch pipe 3 and the second branch pipe 4 intersect at 65° and merge into the main pipe 5. The main pipe 5 is vertically upward and intersects the first branch pipe 3 at 145°. A manhole door 6 and a filter 7 are respectively provided on the first branch pipe 3 and the second branch pipe 4. The filter 7 is located at the front end of the manhole door 6.

[0028] The composite smoke collection pipe consists of two layers: an outer layer of 304 stainless steel pipe 8 and an inner layer of chromium-molybdenum-tungsten wear-resistant alloy layer 9. The chromium-molybdenum-tungsten wear-resistant alloy layer 9 is formed by overlaying chromium-molybdenum-tungsten alloy material on the inner wall of the 304 stainless steel pipe 8, and the overlay thickness of the chromium-molybdenum-tungsten wear-resistant alloy layer 9 is 4-6mm.

[0029] At the bends and turns of outlet pipe 1 and the first branch pipe 3, outlet pipe 2 and the second branch pipe 4, and main pipe 5 and the first branch pipe 3, the thickness of the chromium-molybdenum-tungsten wear-resistant alloy layer 9 welded inside the composite smoke collection pipe is increased to 5-6mm. Appropriately increasing the thickness of the chromium-molybdenum-tungsten wear-resistant alloy layer 9 in the bends of the composite smoke collection pipe, where it is easily eroded and worn by smoke, improves the pipe's strength against smoke impact at bends, effectively extending the overall service life of the smoke collection pipe.

[0030] The manhole door 6 is installed at the opening on the outer wall of the first branch pipe 3 and the second branch pipe 4. An elongated oval manhole 11 is opened on the outer wall of the first branch pipe 3 and the second branch pipe 4. The cover plate 10 of the manhole door 6 is an elongated oval arc plate. An installation block 13 is fixedly installed on one side of the pipe wall of the opening of the manhole 11, and a clamping device 16 is fixedly installed on the other side of the pipe wall corresponding to the opening of the manhole 11. A fastening strip 14 with the same curvature as the cover plate 10 of the manhole door 6 is inserted into the groove of the installation block 13 and fixed in the through hole by bolts. An installation block 13 is fixedly installed in the middle position of the cover plate 10 of the manhole door 6. The middle part of the fastening strip 14 is fixed by the installation block 13. The other end of the fastening strip 14 is connected to the clamping device 14.

[0031] The cover plate 10 of the manhole door 6 is larger than the opening size of the oblong manhole. A sealing groove 12 is provided around the cover plate 10 of the manhole door 6. A sealing strip is provided between the cover plate 10 of the manhole door 6 and the outer wall of the opening of the manhole 11. A handle 23 is also fixedly provided on the cover plate 10 of the manhole door 6.

[0032] One end and the middle of the fastening strip 14 are provided with through holes, and the other end of the fastening strip 14 is fixed with a clamping block 15 with an inner groove. The fastening strip 14 is provided in at least three positions, respectively at the upper, middle and lower positions of the manhole door 6 cover plate 10. The fastening strip 14 is pressed against the outside of the manhole door 6 cover plate 10 along the circumference of the pipe by the mounting block 13 and the pressing device 16. The mounting block 13 is provided with a through hole along the axial center of the pipe, and the mounting block 13 is also provided with an arc-shaped groove along the circumference of the pipe. The groove is perpendicular to the direction of the through hole.

[0033] The clamping device 16 includes a clamping ring 17, a clamping shaft 18, a guide block 19, and a clamping fixing block 20. The guide block 19 and the clamping fixing block 20 are fixedly welded to the pipe sidewall on one side of the manhole 11 opening at intervals. A through hole is longitudinally provided in the guide block 19. The clamping shaft 18 passes through the through hole of the guide block 19. A square clamping ring 17 is rotatably provided in the through hole at the front end of the clamping shaft 18. The rear end of the clamping shaft 18 is riveted to one end of the hinge plate 21. The other end of the hinge plate 21 is riveted to the lower middle part of the clamping handle 22. The lower part of the clamping handle 22 is connected to the clamping fixing block 20 by a pin.

[0034] The filter 7 is installed on the smoke collection pipe at the front end of the manhole 6 via a flange. The filter 7 is equipped with 1-2 filter screens, which are easy to disassemble and clean, or the internal filter element can be removed and replaced at the manhole 11.

[0035] During operation, smoke is discharged from two outlets at the top of the electric furnace cover. These outlets are connected to the first branch pipe 3 and the second branch pipe 4 via outlet pipe 1 and outlet pipe 2, respectively, and then merged into the main pipe 5 to discharge smoke and dust vertically upwards. The composite smoke collection pipe system is optimized with the design of dual outlet flues and the bending angle of the composite smoke collection pipe, which reduces the system resistance of the composite smoke collection pipe, facilitates the smoother discharge of flue gas from the electric furnace, reduces scouring resistance, and improves operating efficiency. Filters 7 are installed on the first branch pipe 3 and the second branch pipe 4 respectively to perform preliminary coarse filtration of the emitted smoke and dust, reducing the wear and scouring of the smoke and dust on the subsequent smoke collection pipe. The filter 7 is located at the front end of the manhole door 6. The manhole door 6 is set to a quick-opening type. Pull up the clamping handle 22 on the clamping device 16 to remove the clamping ring 17 at the front end of the pressure shaft 18 from the inner groove of the clamping block 15 at the end of the fastening strip 14. Loosen the bolt of the end mounting block 13. The other end of the fastening strip 14 can rotate along the fastening bolt at the through hole of the mounting block 13. Hold the handle 23 to open the cover plate 10 of the manhole door 6 for easy cleaning of the dust inside the composite smoke collection pipe. The composite smoke collection pipe consists of an outer layer of 304 stainless steel pipe 8 and an inner layer of chromium-molybdenum-tungsten alloy 9 welded on it. It has wear-resistant and corrosion-resistant properties, as well as high mechanical strength and impact resistance. It can withstand the scouring and wear of high-temperature flue gas and dust generated inside the electric furnace, enabling the composite smoke collection pipe to be used stably in high-temperature, corrosive and scouring environments, greatly extending the service life of the composite smoke collection pipe and improving the smoke collection performance of the electric furnace.

[0036] The parts of this invention not described in detail are prior art. Besides the embodiments described above, this utility model may have other implementations, and all technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by this utility model.

Claims

1. A composite smoke collection pipe for a rock wool electric melting furnace, characterized in that: A furnace cover is fixedly installed on the upper part of the electric melting furnace. Two gas outlets are provided on the upper part of the furnace cover. A smoke collection pipe connecting to the inside of the furnace is fixedly installed on the gas outlet. The smoke collection pipe includes outlet pipe one and outlet pipe two, which are respectively connected to the two gas outlets on the top of the furnace cover. Outlet pipe one is connected to the first branch pipe and intersects it at 140°. Outlet pipe two is connected to the second branch pipe and intersects it at 145°. The first branch pipe and the second branch pipe intersect at 65° and merge into the main pipe. The main pipe is vertically upward and intersects the first branch pipe at 145°. A manhole door and a filter are respectively installed on the first branch pipe and the second branch pipe. The filter is located at the front end of the manhole door.

2. The composite smoke collection pipe for a rock wool electric melting furnace according to claim 1, characterized in that: The smoke collection duct consists of two layers: an outer layer of 304 stainless steel pipe and an inner layer of chromium-molybdenum-tungsten wear-resistant alloy; the thickness of the chromium-molybdenum-tungsten wear-resistant alloy layer is 4-6mm.

3. The composite smoke collection pipe for a rock wool electric melting furnace according to claim 2, characterized in that: At the bends and turns of the outlet pipe 1 and the first branch pipe, the outlet pipe 2 and the second branch pipe, and the main pipe and the first branch pipe, the thickness of the chromium-molybdenum-tungsten wear-resistant alloy layer welded inside the composite smoke collection pipe is increased to 5-6mm.

4. The composite smoke collection pipe for a rock wool electric melting furnace according to claim 1, characterized in that: Manhole doors are installed at the openings on the outer walls of the first and second branch pipes. Elongated oval manholes are made on the outer walls of the first and second branch pipes. The manhole cover is an elongated arc-shaped plate. An mounting block is fixed to one side of the pipe wall where the manhole opening is located, and a clamping device is fixed to the other side of the pipe wall corresponding to the manhole opening. A fastening strip has the same curvature as the manhole cover plate. One end of the fastening strip is inserted into the groove of the mounting block and fixed to the through hole with bolts. An mounting block is fixed in the middle of the manhole cover plate, fixing the middle of the fastening strip. The other end of the fastening strip is connected to the clamping device.

5. A composite smoke collection pipe for a rock wool electric melting furnace according to claim 4, characterized in that: The cover plate of the manhole door is larger than the opening size of the oblong manhole. The manhole door cover plate is provided with a sealing groove in the circumference. A sealing strip is provided between the manhole door cover plate and the outer circumferential wall of the manhole opening. A handle is also fixedly provided on the manhole door cover plate.

6. A composite smoke collection pipe for a rock wool electric melting furnace according to claim 4, characterized in that: One end and the middle of the fastening strip are provided with through holes, and the other end of the fastening strip is fixed with a clamping block with an inner groove; at least three fastening strips are provided, respectively at the upper, middle and lower positions of the manhole cover plate, and the fastening strips are pressed against the outside of the manhole cover plate along the circumference of the pipe by the mounting block and the clamping device.

7. A composite smoke collection pipe for a rock wool electric melting furnace according to claim 4, characterized in that: The mounting block has a through hole along the axial center of the pipe, and an arc-shaped groove along the circumference of the pipe, with the groove perpendicular to the direction of the through hole.

8. A composite smoke collection pipe for a rock wool electric melting furnace according to claim 4, characterized in that: The clamping device includes a clamping ring, a clamping shaft, a guide block, and a clamping fixing block. The guide block and the clamping fixing block are fixedly welded to the pipe sidewall on one side of the manhole opening at intervals. A through hole is longitudinally provided in the guide block. The clamping shaft passes through the through hole of the guide block. A square clamping ring is rotatably provided in the through hole at the front end of the clamping shaft. The rear end of the clamping shaft is riveted to one end of the hinge plate. The other end of the hinge plate is riveted to the lower middle part of the clamping handle. The lower part of the clamping handle is connected to the clamping fixing block by a pin.

9. A composite smoke collection pipe for a rock wool electric melting furnace according to claim 1, characterized in that: The filter is installed on the composite smoke collection duct at the front end of the manhole door via a flange, and the filter contains 1-2 filter screens.

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