Flue gas waste heat utilization device for electric furnace

Abstract

The utility model discloses a flue gas waste heat utilization device for an electric melting furnace, comprising a shell, a mounting plate fixedly mounted on one side of the inner cavity of the shell, and a dust filter fixedly mounted on the mounting plate, a first homogenizing liquid box fixedly mounted on the bottom surface of the inner cavity of the shell, and the bottom of the inner cavity of the first homogenizing liquid box is connected to a water inlet pipe, a second homogenizing liquid box fixedly mounted on the top surface of the inner cavity of the shell, and the top of the inner cavity of the second homogenizing liquid box is connected to a water outlet pipe, a pump shell fixedly mounted in the center of the shell, and an impeller shaft is mounted in the center of the pump shell, and an impeller paddle is fixedly mounted on the impeller shaft. Beneficial effects: The utility model is provided with an impeller shaft, a dust filter, an ash scraper and an ash collecting box. When in use, the installed dust filter can be used to intercept and filter the smoke in the smoke to prevent blockage between the discharge pipes, while extending the service life of the discharge pipes, and can automatically clean the smoke blocked by the dust filter without the need for manual cleaning by workers, making it more convenient to use and more practical.

Description

Technical Field

[0001] The utility model relates to the technical field of preheating recovery, in particular to a fume waste heat utilization device for an electric melting furnace. Background Art

[0002] The electric furnace is a process test instrument commonly used in the field of metallurgical engineering technology. For example, the high-temperature smelting of steel often uses an electric furnace. The electric furnace will produce a large amount of high-temperature flue gas during the high-temperature smelting of steel raw materials. This part of the high-temperature flue gas directly discharged into the atmosphere will not only pollute the environment, but also cause a large amount of heat energy waste. Therefore, a flue gas waste heat utilization device for an electric furnace is needed.

[0003] The prior art discloses a waste heat recovery device for an electric furnace for steel smelting with publication number: CN204574832U. The utility model uses a plurality of exhaust pipes to recover the waste heat of the flue gas generated when the electric furnace is working, and intercepts the smoke dust in the passing flue gas through the exhaust pipes to reduce the pollution of the exhaust flue gas. However, using the exhaust pipes to block the smoke dust in the flue gas not only easily causes blockage of the inner cavity of the shell, requiring the user to regularly shut down and open the machine for cleaning, but also has a certain impact on the service life of the exhaust pipes. In view of the shortcomings of the prior art, a person skilled in the art has proposed a waste heat utilization device for flue gas in an electric furnace. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the utility model provides a flue gas waste heat utilization device for an electric melting furnace, which has the advantages of being able to intercept and filter smoke in the smoke by using an installed dust filter to prevent blockage between the exhaust pipes, while extending the service life of the exhaust pipes, and being able to automatically clean the smoke blocked by the dust filter without the need for manual cleaning by workers. It is more convenient to use and has stronger practicality, thereby solving the problems in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] In order to realize the above-mentioned dust filter that can be installed to intercept and filter the smoke in the smoke, prevent blockage between the exhaust pipes, and at the same time extend the service life of the exhaust pipes, and can automatically clean the smoke blocked by the dust filter, without the need for workers to manually clean it, it is more convenient to use and has the advantages of stronger practicality. The specific technical scheme adopted by the utility model is as follows: A flue gas waste heat utilization device for an electric melting furnace comprises a shell, a mounting plate is fixedly installed on one side of the inner cavity of the shell, and a dust filter is fixedly installed on the mounting plate, a first homogenizing liquid box is fixedly installed on the bottom surface of the inner cavity of the shell, and the bottom of the inner cavity of the first homogenizing liquid box is connected to a water inlet pipe, and a second homogenizing liquid box is fixedly installed on the top surface of the inner cavity of the shell A liquid tank, and the top of the inner cavity of the second uniform liquid tank is connected with a water outlet pipe, a pump casing is fixedly installed in the center of the shell, and an impeller shaft is installed in the center of the pump casing, and an impeller paddle is fixedly installed on the impeller shaft, a plurality of water inlets are opened on the bottom surface of the pump casing, and the water inlets are connected with the first transition box, a plurality of water outlets are opened on the top surface of the pump casing, and the water outlets are connected with the second transition box, a plurality of discharge pipes are connected and installed between the first uniform liquid box and the first transition box, and between the second uniform liquid box and the second transition box, the impeller shaft passes through one end of the mounting plate and is symmetrically fixed with a mounting rod, and a dust scraper plate is fixedly installed on one side of the mounting rod, and one end of the dust scraper plate is abutted against the dust filter.

[0008] Furthermore, a smoke inlet interface and a sealing gasket frame are provided on one side of the shell, and mounting screw holes are opened on one side of the shell corresponding to the smoke inlet interface and the sealing gasket frame, and mounting bolts are screwed and installed in the mounting screw holes. A smoke outlet interface and a sealing gasket frame are provided on the other side of the shell, and mounting screw holes are opened on the other side of the shell corresponding to the smoke outlet interface and the sealing gasket frame, and mounting bolts are screwed and installed in the mounting screw holes.

[0009] Furthermore, an ash collecting trough opened on the bottom surface of the shell is provided below one side of the mounting plate, and an ash collecting box fixedly installed on the bottom surface of the shell is provided below the ash collecting trough. The bottom of the inner cavity of the ash collecting box is connected to an ash discharge pipe, and an electromagnetic valve is installed on the ash discharge pipe.

[0010] Furthermore, a steam-water separator is installed on one end of the water outlet pipe, and a steam outlet pipe and a hot water outlet pipe are installed on the steam-water separator.

[0011] Furthermore, the central axes of the casing, pump housing, impeller shaft, mounting plate and dust filter are on the same straight line.

[0012] Furthermore, a control panel is installed on the shell, and the control panel is electrically connected to the solenoid valve.

[0013] Furthermore, the cross-section of the ash collecting trough is an inverted isosceles trapezoid.

[0014] (III) Beneficial effects

[0015] Compared with the prior art, the utility model provides a flue gas waste heat utilization device for an electric melting furnace, which has the following beneficial effects:

[0016] (1) The utility model is provided with a shell, a pump shell, a dust filter and an exhaust pipe. A smoke inlet interface and a sealing gasket frame are provided on one side of the shell, and mounting screw holes are provided on one side of the shell corresponding to the smoke inlet interface and the sealing gasket frame, and mounting bolts are screwed and installed in the mounting screw holes. A smoke outlet interface and a sealing gasket frame are provided on the other side of the shell, and mounting screw holes are also provided on the other side of the shell corresponding to the smoke outlet interface and the sealing gasket frame, and mounting bolts are screwed and installed in the mounting screw holes. When in use, the high-temperature smoke generated when the electric melting furnace is working can enter the inner cavity of the shell through the smoke inlet interface, and then be discharged through the smoke outlet interface. A mounting plate is provided on one side of the inner cavity of the shell, and a dust filter is fixedly installed on the mounting plate, so that the high-temperature smoke will be filtered by the dust filter to remove the smoke contained therein before entering the inner cavity of the shell. At the same time, cold water from the outside can be pumped into the inner cavity of the first homogenizing tank through the water inlet pipe, and then connected to the first homogenizing tank through the water inlet pipe. The water enters the inner cavity of the first transition box through several discharge pipes, and then enters the inner cavity of the pump casing installed in the center of the shell through the water inlet. The inner cavity of the pump casing is installed with an impeller shaft, and the impeller paddle is installed on the impeller shaft. When the water enters the inner cavity of the pump casing through the water inlet, it will push the impeller paddle to drive the impeller shaft to rotate, and then enter the inner cavity of the second transition box through the water outlet, and then enter the inner cavity of the second liquid homogenizing box through the discharge pipe. The high-temperature flue gas passing through the inner cavity of the shell can be subjected to waste heat absorption and heat recovery by utilizing the set discharge pipes, and the high-temperature flue gas is utilized to heat the water. Since the set impeller paddle can reduce the speed of the water passing through the discharge pipe, the recovery effect of the water on the waste heat of the flue gas can be improved. The obtained heated water can enter the steam-water separator through the water outlet pipe, the obtained water vapor can be exported and utilized through the steam outlet pipe, and the obtained hot water can be exported and utilized through the hot water outlet pipe, thereby realizing the recovery and utilization of the waste heat of the flue gas generated when the electric furnace is working, with good heat recovery effect and strong practicality.

[0017] (2) The utility model is provided with an impeller shaft, a dust filter, an ash scraper and an ash collecting box. As mentioned above, when water passes through the inner cavity of the pump casing, the impeller shaft can be driven to rotate. The impeller shaft is set to penetrate one end of the mounting plate and is symmetrically fixed with a mounting rod, and a ash scraper is fixedly installed on one side of the mounting rod, and the ash scraper is abutted against the dust filter. Therefore, when the impeller shaft rotates, the mounting rod and the ash scraper can be driven to rotate, so that the smoke and dust blocked on the dust filter can be scraped off, and the scraped smoke and dust can slide along the ash collecting groove into the ash collecting box fixedly installed on the bottom surface of the casing. Temporary storage and collection are carried out. When the smoke dust collected in the ash box is large, the solenoid valve installed on the ash discharge pipe can be opened to discharge the collected smoke dust, thereby eliminating the need for users to regularly shut down the machine and open the shell to clean the smoke dust. Therefore, the smoke waste heat utilization device for the electric melting furnace can use the installed dust filter to intercept and filter the smoke dust in the smoke to prevent blockage between the discharge pipes, while extending the service life of the discharge pipes, and can automatically clean the smoke dust blocked by the dust filter without manual cleaning by workers. It is more convenient to use and more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of a device for utilizing waste heat from flue gas for an electric melting furnace according to an embodiment of the utility model;

[0020] Figure 2 According to the embodiment of the utility model Figure 1 A magnified image of point A;

[0021] Figure 3 According to the embodiment of the utility model Figure 1 A magnified view of point B;

[0022] Figure 4 It is a three-dimensional diagram of a scraper plate of a flue gas waste heat utilization device for an electric melting furnace according to an embodiment of the utility model.

[0023] In the figure:

[0024] 1. Shell; 2. Ash discharge pipe; 3. Ash collecting box; 4. Smoke inlet interface; 5. Solenoid valve; 6. Mounting bolts; 7. Steam outlet pipe; 8. Steam-water separator; 9. Water outlet pipe; 10. Hot water outlet pipe; 11. Second homogenizing tank; 12. Discharge pipe; 13. Second transition box; 14. Pump shell; 15. Smoke outlet interface; 16. First homogenizing tank; 17. Sealing gasket frame; 18. Water inlet pipe; 19. First transition box; 20. Water inlet; 21. Impeller shaft; 22. Impeller paddle; 23. Water outlet; 24. Mounting plate; 25. Dust filter; 26. Mounting rod; 27. Ash scraper; 28. Ash collecting trough. DETAILED DESCRIPTION

[0025] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementation methods and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0026] According to an embodiment of the utility model, a device for utilizing waste heat from flue gas for an electric melting furnace is provided.

[0027] The present invention is now further described in conjunction with the accompanying drawings and specific implementation methods. Figure 1-4As shown, according to an embodiment of the utility model, the flue gas waste heat utilization device for an electric melting furnace includes a shell 1, a mounting plate 24 is fixedly installed on one side of the inner cavity of the shell 1, and a dust filter 25 is fixedly installed on the mounting plate 24, a first homogenizing tank 16 is fixedly installed on the bottom surface of the inner cavity of the shell 1, and the bottom of the inner cavity of the first homogenizing tank 16 is connected to the water inlet pipe 18, a second homogenizing tank 11 is fixedly installed on the top surface of the inner cavity of the shell 1, and the top of the inner cavity of the second homogenizing tank 11 is connected to the water outlet pipe 9, a pump shell 14 is fixedly installed in the center of the shell 1, and an impeller shaft 21 is installed in the center of the pump shell 14, and an impeller paddle 22 is fixedly installed on the impeller shaft 21, a plurality of water inlets 20 are opened on the bottom surface of the pump shell 14, and the water inlet 20 is connected to the first transition box 19, and the pump shell 14 A plurality of water outlets 23 are provided on the top surface, and the water outlets 23 are connected to the second transition box 13. A plurality of discharge pipes 12 are connected and installed between the first homogenizing box 16 and the first transition box 19, and between the second homogenizing box 11 and the second transition box 13. The impeller shaft 21 passes through the mounting plate 24, and a mounting rod 26 is symmetrically fixedly installed at one end thereof. A dust scraper 27 is fixedly installed on one side of the mounting rod 26, and one end of the dust scraper 27 is in contact with the dust filter 25, so that the installed dust filter 25 can be used to intercept and filter the smoke in the flue gas to prevent blockage between the discharge pipes 12, and at the same time, the service life of the discharge pipes 12 is extended, and the smoke blocked by the dust filter 25 can be automatically cleaned without manual cleaning by workers, which is more convenient to use and more practical.

[0028] In one embodiment, a smoke inlet interface 4 and a sealing gasket frame 17 are provided on one side of the shell 1, and mounting screw holes are opened on one side of the shell 1 corresponding to the smoke inlet interface 4 and the sealing gasket frame 17, and mounting bolts 6 are screwed and installed in the mounting screw holes. A smoke outlet interface 15 and a sealing gasket frame 17 are provided on the other side of the shell 1, and mounting screw holes are opened on the other side of the shell 1 corresponding to the smoke outlet interface 15 and the sealing gasket frame 17, and mounting bolts 6 are screwed and installed in the mounting screw holes, so that the high-temperature smoke generated when the electric melting furnace is working can enter the inner cavity of the shell 1 through the smoke inlet interface 4, and then be discharged through the smoke outlet interface 15.

[0029] In one embodiment, an ash collecting groove 28 opened on the bottom surface of the shell 1 is provided below one side of the mounting plate 24, and an ash collecting box 3 fixedly installed on the bottom surface of the shell 1 is provided below the ash collecting groove 28. The bottom of the inner cavity of the ash collecting box 3 is connected to an ash discharge pipe 2, and an electromagnetic valve 5 is installed on the ash discharge pipe 2, which serves to centrally collect the scraped smoke and dust and facilitate subsequent extraction and cleaning.

[0030] In one embodiment, a steam-water separator 8 is installed at one end of the water outlet pipe 9, and a steam outlet pipe 7 and a hot water outlet pipe 10 are installed on the steam-water separator 8, so as to separate and utilize the hot water and water vapor generated by absorbing the waste heat.

[0031] In one embodiment, the central axes of the housing 1, the pump casing 14, the impeller shaft 21, the mounting plate 24 and the dust filter 25 are on the same straight line.

[0032] In one embodiment, a control panel is installed on the shell 1, and the control panel is electrically connected to the solenoid valve 5. The control circuit of the control panel can be realized through simple programming by technicians in this field. It is common knowledge in this field and is only used without modification. Therefore, the control method and circuit connection will not be described in detail.

[0033] In one embodiment, the cross-section of the ash collecting trough 28 is an inverted isosceles trapezoid.

[0034] Working principle: The utility model is provided with a shell 1, a pump shell 14, a dust filter 25 and a discharge pipe 12. A smoke inlet interface 4 and a sealing gasket frame 17 are provided on one side of the shell 1, and mounting screw holes are provided on one side of the shell 1 corresponding to the smoke inlet interface 4 and the sealing gasket frame 17, and mounting bolts 6 are screwed and installed in the mounting screw holes. A smoke outlet interface 15 and a sealing gasket frame 17 are provided on the other side of the shell 1, and mounting screw holes are also provided on the other side of the shell 1 corresponding to the smoke outlet interface 15 and the sealing gasket frame 17, and mounting bolts 6 are screwed and installed in the mounting screw holes. When in use, the high-temperature smoke generated when the electric melting furnace is working can enter the inner cavity of the shell 1 through the smoke inlet interface 4, and then be discharged through the smoke outlet interface 15. The inner cavity of the shell 1 is provided A mounting plate 24 is installed on one side of the cavity, and a dust filter 25 is fixedly installed on the mounting plate 24, so the high-temperature flue gas will be filtered by the dust filter 25 to remove the smoke contained in it before entering the inner cavity of the shell 1. At the same time, external cold water can be pumped into the inner cavity of the first homogenizing box 16 through the water inlet pipe 18, and then enter the inner cavity of the first transition box 19 through a plurality of discharge pipes 12 connected to the first homogenizing box 16, and then enter the inner cavity of the pump casing 14 installed in the center of the shell 1 through the water inlet 20. The inner cavity of the pump casing 14 is provided with an impeller shaft 21, and an impeller paddle 22 is installed on the impeller shaft 21. When water enters the inner cavity of the pump casing 14 through the water inlet 20, it will push the impeller paddle 22 to drive the impeller shaft 21 to rotate, and then enter the inner cavity of the second transition box 13 through the water outlet 23, and then After that, it enters the inner cavity of the second homogenizing tank 11 through the discharge pipe 12. The high-temperature flue gas passing through the inner cavity of the shell 1 can be used to absorb the waste heat and recover the heat by using the several discharge pipes 12. The high-temperature flue gas is used to heat the water body. Since the impeller blade 22 can reduce the speed of the water body passing through the discharge pipe 12, the recovery effect of the water body on the waste heat of the flue gas can be improved. The obtained heated water body can enter the steam-water separator 8 through the water outlet pipe 9, and the obtained water vapor can be exported and utilized through the steam outlet pipe 7, and the obtained hot water can be exported and utilized through the hot water outlet pipe 10, thereby realizing the recovery and utilization of the waste heat of the flue gas generated when the electric melting furnace is working, with good heat recovery effect and strong practicality. In addition, the utility model is provided with an impeller shaft 21, a dust filter 25, an ash scraper 27 and an ash collecting box 3, as described above As described above, when water passes through the inner cavity of the pump casing 14, it can drive the impeller shaft 21 to rotate. The impeller shaft 21 is set to pass through one end of the mounting plate 24 and is symmetrically fixed with a mounting rod 26, and a dust scraper 27 is fixedly installed on one side of the mounting rod 26, and the dust scraper 27 is in contact with the dust filter 25. Therefore, when the impeller shaft 21 rotates, the mounting rod 26 and the dust scraper 27 can be driven to rotate, so that the smoke blocked on the dust filter 25 can be scraped off, and the scraped smoke can slide along the dust collecting groove 28 to the dust collecting box 3 fixedly installed on the bottom surface of the casing 1 for temporary storage and collection. When the smoke collecting box 3 is collected in a lot, the solenoid valve 5 installed on the ash discharge pipe 2 can be opened to export the collected smoke, so that the user does not need to regularly stop the machine to open the casing 1 to clean the smoke.Therefore, the electric furnace flue gas waste heat utilization device can use the installed dust filter 25 to intercept and filter the smoke in the smoke, prevent blockage between the exhaust pipes 12, and at the same time extend the service life of the exhaust pipes 12. It can also automatically clean the smoke blocked by the dust filter 25 without manual cleaning by workers, making it more convenient to use and more practical.

[0035] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for utilizing waste heat from flue gas of an electric furnace, comprising a housing (1), characterized in that: A mounting plate (24) is fixedly mounted on one side of the inner cavity of the shell (1), and a dust filter (25) is fixedly mounted on the mounting plate (24); a first homogenizing liquid box (16) is fixedly mounted on the bottom surface of the inner cavity of the shell (1), and the bottom of the inner cavity of the first homogenizing liquid box (16) is connected to a water inlet pipe (18); a second homogenizing liquid box (11) is fixedly mounted on the top surface of the inner cavity of the shell (1), and the top of the inner cavity of the second homogenizing liquid box (11) is connected to a water outlet pipe (9); a pump shell (14) is fixedly mounted in the center of the shell (1), and an impeller shaft (21) is fixedly mounted in the center of the pump shell (14), and an impeller paddle (22) is fixedly mounted on the impeller shaft (21); and a pump shell (14) is fixedly mounted on the bottom surface of the pump shell (14). A plurality of water inlets (20) are provided on the surface, and the water inlets (20) are connected to a first transition box (19); a plurality of water outlets (23) are provided on the top surface of the pump housing (14), and the water outlets (23) are connected to a second transition box (13); a plurality of discharge pipes (12) are connected and installed between the first homogenizing liquid box (16) and the first transition box (19), and between the second homogenizing liquid box (11) and the second transition box (13); the impeller shaft (21) passes through the mounting plate (24), and one end of the impeller shaft (21) is symmetrically fixedly installed with a mounting rod (26); a dust scraper (27) is fixedly installed on one side of the mounting rod (26), and one end of the dust scraper (27) is in contact with the dust filter (25).

2. The device for utilizing waste heat from flue gas for an electric melting furnace according to claim 1, characterized in that: A smoke inlet interface (4) and a sealing gasket frame (17) are provided on one side of the shell (1), and mounting screw holes are provided on one side of the shell (1) corresponding to the smoke inlet interface (4) and the sealing gasket frame (17), and mounting bolts (6) are screwed and installed in the mounting screw holes; a smoke outlet interface (15) and a sealing gasket frame (17) are provided on the other side of the shell (1), and mounting screw holes are provided on the other side of the shell (1) corresponding to the smoke outlet interface (15) and the sealing gasket frame (17), and mounting bolts (6) are screwed and installed in the mounting screw holes.

3. The device for utilizing waste heat from flue gas for an electric melting furnace according to claim 1, characterized in that: An ash collecting groove (28) opened on the bottom surface of the shell (1) is provided below one side of the mounting plate (24), and an ash collecting box (3) fixedly installed on the bottom surface of the shell (1) is provided below the ash collecting groove (28); the bottom of the inner cavity of the ash collecting box (3) is connected to an ash discharge pipe (2), and an electromagnetic valve (5) is installed on the ash discharge pipe (2).

4. The device for utilizing waste heat from flue gas for an electric melting furnace according to claim 1, characterized in that: One end of the water outlet pipe (9) is connected to a steam-water separator (8), and the steam-water separator (8) is connected to a steam outlet pipe (7) and a hot water outlet pipe (10).

5. The device for utilizing waste heat from flue gas for an electric melting furnace according to claim 1, characterized in that: The central axes of the housing (1), the pump casing (14), the impeller shaft (21), the mounting plate (24) and the dust filter (25) are on the same straight line.

6. The device for utilizing waste heat from flue gas for an electric melting furnace according to claim 1, characterized in that: A control panel is installed on the housing (1), and the control panel is electrically connected to the solenoid valve (5).

7. The device for utilizing waste heat from flue gas for an electric melting furnace according to claim 3, characterized in that: The cross-sectional shape of the ash collecting trough (28) is an inverted isosceles trapezoid.

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