A gas-water compound spray cooling electric furnace cover and an electric furnace

Abstract

The present invention discloses a gas-water compound spray cooling electric furnace cover and an electric furnace. The gas-water compound spray cooling electric furnace cover includes an upper cover plate (1), a lower cover plate (3), an outer vertical plate (7) and an inner vertical plate (8). A receiving space is formed between the upper cover plate (1) and the lower cover plate (3). A compressed air supply branch pipe (4), a cooling water supply branch pipe (5) and a gas-water compound nozzle (6) are arranged in the receiving space. The gas-water compound nozzle (6) is respectively connected to the compressed air supply branch pipe (4) and the cooling water supply branch pipe (5). The gas-water compound nozzle (6) can spray a gas-water mixture downward onto the lower cover plate (3). The lower cover plate (3) is located between the outer vertical plate (7) and the inner vertical plate (8). A drain port (701) is arranged at the lower part of the outer vertical plate (7). This gas-water compound spray cooling electric furnace cover has the advantages of low cooling water pressure, small flow rate, low thermal stress, high furnace cover life, convenient overhaul and maintenance, and high safety.

Description

Technical Field

[0001] The present invention relates to the field of steelmaking equipment, specifically a gas-water compound spray cooling electric furnace cover, and also an electric furnace containing the gas-water compound spray cooling electric furnace cover. Background Art

[0002] At present, in the process of electric furnace steelmaking, the gas-water compound spray cooling electric furnace cover mostly adopts a water-cooled coil structure. In this structure, the water-cooled coil bears a cooling water pressure of 0.6 MPa and also bears the high-temperature radiation from the furnace interior. The stress on the structure is relatively large, the service life of the furnace cover is short, the cooling water pressure is high and the flow rate is large, and the energy consumption is relatively large. Summary of the Invention

[0003] In order to improve the service life of the furnace cover, the present invention provides a gas-water compound spray cooling electric furnace cover and an electric furnace. The gas-water compound spray cooling electric furnace cover has the advantages of low cooling water pressure, small flow rate, low thermal stress, high furnace cover life, convenient maintenance and high safety.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a gas-water compound spray cooling electric furnace cover, including an upper cover plate, a lower cover plate, an outer vertical plate and an inner vertical plate. The upper cover plate and the lower cover plate are arranged at intervals up and down to form an accommodation space. A compressed air supply branch pipe, a cooling water supply branch pipe and a gas-water compound nozzle are arranged in the accommodation space. The gas-water compound nozzle is respectively connected with the compressed air supply branch pipe and the cooling water supply branch pipe. The gas-water compound nozzle can spray a gas-water mixture downward onto the lower cover plate. A drain port is arranged at the lower part of the outer vertical plate. The inner vertical plate is located inside the outer vertical plate, and the lower cover plate is located between the outer vertical plate and the inner vertical plate.

[0005] A support is arranged between the upper cover plate and the lower cover plate. The compressed air supply branch pipe extends along the diameter direction of the gas-water compound spray cooling electric furnace cover, and the cooling water supply branch pipe also extends along the diameter direction of the gas-water compound spray cooling electric furnace cover. The compressed air supply branch pipes are connected in one-to-one correspondence with the cooling water supply branch pipes.

[0006] A compressed air supply main pipe is arranged between the upper cover plate and the outer vertical plate. The compressed air supply main pipe has an annular structure, and the compressed air supply branch pipes are communicated with the compressed air supply main pipe.

[0007] Both the upper cover plate and the lower cover plate have a conical structure. An inspection hole and an inspection cover plate are arranged on the upper cover plate, and a water collecting trough is arranged at the outer end of the lower cover plate.

[0008] A cooling water supply main pipe is arranged between the upper cover plate and the inner vertical plate. The cooling water supply main pipe has an annular structure, and the cooling water supply branch pipes are communicated with the cooling water supply main pipe.

[0009] The main cooling water supply pipe is formed by sequentially connecting an inner vertical plate, an upper end ring, an outer sleeve, and a lower end ring. The outer sleeve is sleeved outside the inner vertical plate, and the upper cover plate is hermetically connected to the outer sleeve.

[0010] The gas-water compound spray cooling electric furnace cover further includes an upper end cover containing a circular plate section and an inner cylindrical section connected up and down. The lower end of the inner cylindrical section is hermetically connected to the upper end ring, and a smoke exhaust port is provided on the inner cylindrical section.

[0011] An exhaust sleeve is sleeved outside the upper end cover. An upper annular cavity is formed between the exhaust sleeve and the upper end cover. The exhaust sleeve contains a circular ring section and an outer cylindrical section connected up and down. The circular ring section is hermetically connected to the upper end cover, and the outer cylindrical section is hermetically connected to the upper cover plate. Upper exhaust holes are provided on the inner edge of the upper cover plate, and intake through holes are provided on the inner cylindrical section. The gas in the accommodation space can sequentially enter the inner cavity of the upper end cover through the upper exhaust holes, the upper annular cavity, and the intake through holes.

[0012] An electric furnace, the electric furnace includes a return water supply system and the above-mentioned gas-water compound spray cooling electric furnace cover. The return water supply system is connected to the drain port, and the return water supply system can supply cooling water into the cooling water supply branch pipe.

[0013] The return water supply system includes a Venturi pump, a return water tank, and a cooling tower. The drain port is connected to the suction port of the Venturi pump through a first drain pipeline. The discharge port of the Venturi pump is connected to the inlet of the return water tank through a second drain pipeline. The water in the return water tank can enter the injection port of the Venturi pump, and the water in the return water tank can also enter the cooling tower. The cooling tower can supply cooling water into the cooling water supply branch pipe through a third drain pipeline.

[0014] The beneficial effects of the present invention are: The gas-water compound spray cooling electric furnace cover has the advantages of low cooling water pressure, small flow rate, low thermal stress, high furnace cover life, convenient maintenance and high safety. Description of the Drawings

[0015] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0016] Figure 1 It is an assembly schematic diagram of the gas-water compound spray cooling electric furnace cover of the present invention.

[0017] Figure 2 It is Figure 1 The partial enlarged schematic diagram in

[0018] Figure 3 It is a sectional view taken along the A-A direction in Figure 2

[0019] Figure 4 ​It is the top view of the gas-water compound spray cooling electric furnace roof described in the present invention.

[0020] Figure 5 It is the schematic diagram of the electric furnace described in the present invention.

[0021] 1. Upper cover plate; 2. Bracket; 3. Lower cover plate; 4. Compressed air supply branch pipe; 5. Cooling water supply branch pipe;

[0022] 6. Gas-water compound nozzle; 7. Outer vertical plate; 8. Inner vertical plate; 9. Compressed air supply main pipe; 10. Cooling water supply main pipe; 11. Upper end cover; 12. Exhaust sleeve; 13. Return water supply system; 14. Central small furnace cover; 15. High-temperature electrode; 16. Holding arm; 17. Furnace body;

[0023] 101. Maintenance cover plate; 102. Upper exhaust hole;

[0024] 301. Water collecting tank;

[0025] 701. Drainage port;

[0026] 1001. Upper end ring; 1002. Outer sleeve; 1003. Lower end ring;

[0027] 1101. Circular plate section; 1102. Inner cylindrical section; 1103. Intake through hole; 1104. Smoke exhaust port;

[0028] 1201. Ring section; 1202. Outer cylindrical section;

[0029] 1301. Venturi pump; 1302. Return water tank; 1303. Cooling tower; 1304. First drainage pipeline; 1305. Second drainage pipeline; 1306. Third drainage pipeline; 1307. Fourth drainage pipeline; 1308. Fifth drainage pipeline;

[0030] 13011. Suction port; 13012. Discharge port; 13013. Injection port. Detailed implementation manners

[0031] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] A gas-water compound spray cooling electric furnace cover includes an upper cover plate 1, a lower cover plate 3, an outer vertical plate 7 and an inner vertical plate 8. The upper cover plate 1 and the lower cover plate 3 are arranged at an interval up and down. An annular accommodation space is formed between the upper cover plate 1 and the lower cover plate 3. A compressed air supply branch pipe 4, a cooling water supply branch pipe 5 and a gas-water compound nozzle 6 are arranged in the accommodation space. The gas-water compound nozzle 6 is respectively connected with the compressed air supply branch pipe 4 and the cooling water supply branch pipe 5. The gas-water compound nozzle 6 can spray a gas-water mixture downward onto the lower cover plate 3. The inner vertical plate 8 is located inside the outer vertical plate 7. The lower cover plate 3 is located between the outer vertical plate 7 and the inner vertical plate 8. A drain port 701 is provided at the lower part of the outer vertical plate 7, as Figures 1 to 4 shown.

[0033] The compressed air in the compressed air supply branch pipe 4 and the cooling water in the cooling water supply branch pipe 5 can both be ejected from the gas-water compound nozzle 6. The gas-water mixture ejected by the gas-water compound nozzle 6 can cool the lower cover plate 3. The pressure in the accommodation space is the same as the external atmospheric pressure. This gas-water compound spray cooling electric furnace cover has the advantages of low cooling water pressure, small flow rate, low thermal stress, high furnace cover life, convenient maintenance and high safety.

[0034] In this embodiment, both the upper cover plate 1 and the lower cover plate 3 are in a conical structure. Both the outer vertical plate 7 and the inner vertical plate 8 are in a cylindrical structure. The axes of the outer vertical plate 7, the inner vertical plate 8, the upper cover plate 1 and the lower cover plate 3 coincide. A plurality of brackets 2 are provided between the upper cover plate 1 and the lower cover plate 3. The brackets 2 can be made of H-shaped steel. The extending direction of the H-shaped steel is the same as the diameter direction of the lower cover plate 3. The brackets 2 divide the accommodation space into a plurality of fan-shaped spaces, as Figures 1 to 3 shown.

[0035] In this embodiment, the compressed air supply branch pipe 4 extends along the diameter direction of the gas-water compound spray cooling electric furnace cover, and the cooling water supply branch pipe 5 also extends along the diameter direction of the gas-water compound spray cooling electric furnace cover. The compressed air supply branch pipe 4 and the cooling water supply branch pipe 5 are connected in one-to-one correspondence. A plurality of gas-water compound nozzles 6 are provided on one compressed air supply branch pipe 4 and one cooling water supply branch pipe 5. The gas-water compound nozzle 6 can not only spray a gas-water mixture downward onto the lower cover plate 3, but also spray a gas-water mixture onto the outer vertical plate 7 and the inner vertical plate 8, as Figure 2 shown.

[0036] In this embodiment, a main compressed air supply pipe 9 is provided between the upper cover plate 1 and the outer vertical plate 7. The main compressed air supply pipe 9 has an annular structure and is sleeved outside the upper cover plate 1. The upper end of the upper cover plate 1 is hermetically and fixedly connected to the main compressed air supply pipe 9, and the outer edge of the outer vertical plate 7 is hermetically and fixedly connected to the main compressed air supply pipe 9. The compressed air supply branch pipe 4 is communicated with the main compressed air supply pipe 9. The main compressed air supply pipe 9 is externally connected with a compressed air supply pipeline or a compressed air gas source.

[0037] In this embodiment, the upper cover plate 1 is provided with a plurality of inspection holes and a plurality of inspection cover plates 101. The plurality of inspection cover plates 101 are evenly spaced along the circumferential direction of the upper cover plate 1. The inspection holes and the inspection cover plates 101 are connected in one-to-one correspondence. The arrangement of the inspection holes and the inspection cover plates 101 facilitates inspection. A water collecting tank 301 is provided at the outer end of the lower cover plate 3. The water in the air-water mixture ejected by the air-water composite nozzle 6 will collect in the water collecting tank 301 and then be discharged from the drain port 701.

[0038] In this embodiment, a main cooling water supply pipe 10 is provided between the upper cover plate 1 and the inner vertical plate 8. The main cooling water supply pipe 10 is sleeved inside the upper cover plate 1. The main cooling water supply pipe 10 has an annular structure. The axis of the upper cover plate 1, the axis of the main compressed air supply pipe 9, and the axis of the main cooling water supply pipe 10 coincide. The cooling water supply branch pipe 5 is communicated with the main cooling water supply pipe 10, as Figure 2 shown.

[0039] In this embodiment, the main cooling water supply pipe 10 is formed by sequentially and hermetically connecting the inner vertical plate 8, the upper end ring 1001, the outer sleeve 1002, and the lower end ring 1003. The upper end ring 1001 and the lower end ring 1003 are arranged at intervals up and down. The outer sleeve 1002 is sleeved outside the inner vertical plate 8, and the upper cover plate 1 is hermetically connected to the outer sleeve 1002. The axis of the inner vertical plate 8, the axis of the upper end ring 1001, the axis of the outer sleeve 1002, and the axis of the lower end ring 1003 coincide.

[0040] In this embodiment, the air-water composite spray cooling electric furnace cover further includes an upper end cover 11 including a circular plate section 1101 and an inner cylindrical section 1102 connected up and down. The axis of the upper end cover 11 coincides with the axis of the inner vertical plate 8. The lower end of the inner cylindrical section 1102 is hermetically and fixedly connected to the edge of the upper end ring 1001. A smoke exhaust port 1104 is provided on the inner cylindrical section 1102, and a smoke exhaust pipe is externally connected to the smoke exhaust port 1104.

[0041] In this embodiment, an exhaust sleeve 12 is sleeved outside the upper end cover 11. An upper annular cavity is formed between the exhaust sleeve 12 and the upper end cover 11. The exhaust sleeve 12 includes an upper and lower connected circular ring section 1201 and an outer cylindrical section 1202. The circular ring section 1201 is hermetically connected to the upper end cover 11, and the outer cylindrical section 1202 is hermetically connected to the upper cover plate 1. An upper exhaust hole 102 is provided at the inner edge of the upper cover plate 1, and an intake through hole 1103 is provided on the inner cylindrical section 1102. The gas in the accommodation space can sequentially enter the inner cavity of the upper end cover 11 through the upper exhaust hole 102, the upper annular cavity, and the intake through hole 1103. The gas in the inner cavity of the upper end cover 11 can enter the exhaust duct through the exhaust port 1104.

[0042] In this embodiment, the gas-water composite spray cooling electric furnace cover further includes a central small furnace cover 14, a high-temperature electrode 15, and a holding arm 16. The central small furnace cover 14 is cast from high-aluminum refractory material. The central small furnace cover 14 is sleeved inside the inner vertical plate 8, and the central small furnace cover 14 is hermetically connected to the inner vertical plate 8. The high-temperature electrode 15 passes through the upper end cover 11 and the central small furnace cover 14, and the high-temperature electrode 15 is in clearance fit with the central small furnace cover 14. The flue gas in the electric furnace can enter the inner cavity of the upper end cover 11. The holding arm 16 is located on the upper cover plate 1, as Figure 1 and Figure 4 shown.

[0043] Next, an electric furnace is introduced. The electric furnace includes a return water supply system 13, a furnace body 17, and the above-mentioned gas-water composite spray cooling electric furnace cover. The gas-water composite spray cooling electric furnace cover is connected to the furnace body 17 up and down. The return water supply system 13 is connected to the drain port 701. The water in the gas-water mixture sprayed by the gas-water composite nozzle 6 can enter the return water supply system 13, and the return water supply system 13 can supply cooling water to the cooling water supply branch pipe 5, as Figure 5 shown.

[0044] In this embodiment, the return water supply system 13 includes a Venturi pump 1301, a return water tank 1302, and a cooling tower 1303. The drain port 701 is connected to the suction port 13011 of the Venturi pump 1301 through a first drain pipeline 1304. The discharge port 13012 of the Venturi pump 1301 is connected to the inlet of the return water tank 1302 through a second drain pipeline 1305. The water in the return water tank 1302 can enter the injection port 13013 of the Venturi pump 1301. The water in the return water tank 1302 can also enter the cooling tower 1303, and the cooling tower 1303 can supply cooling water to the cooling water supply branch pipe 5 through a third drain pipeline 1306.

[0045] The injection port 13013 of the venturi pump 1301 is connected to the inlet of the cooling tower 1303 through the fourth drainage pipeline 1307, the fourth drainage pipeline 1307 is provided with a return valve, the outlet of the return water tank 1302 is connected to the fourth drainage pipeline 1307 through the fifth drainage pipeline 1308, the third drainage pipeline 1306 and the fifth drainage pipeline 1308 are both provided with a water supply pump, and the third drainage pipeline 1306 is connected to the cooling water supply main pipe 10. The high-temperature cooling water discharged from the gas-water composite spray cooling electric furnace roof first enters the return water tank 1302, and then the high-temperature cooling water enters the cooling tower 1303 to be cooled into low-temperature water, and the low-temperature water enters the cooling water supply main pipe 10 again, and the cycle repeats.

[0046] The working process of the gas-water composite spray cooling of the electric furnace cover and the electric furnace is introduced below.

[0047] The compressed air in the compressed air supply main pipe 9 enters the compressed air supply branch pipe 4, and the cooling water in the cooling water supply main pipe 10 enters the cooling water supply branch pipe 5. The compressed air in the compressed air supply branch pipe 4 and the cooling water in the cooling water supply branch pipe 5 are sprayed out from the air-water composite nozzle 6. The water in the air-water mixture sprayed out from the air-water composite nozzle 6 is collected in the water collecting tank 301 and discharged from the drain port 701. The air in the air-water mixture sprayed out from the air-water composite nozzle 6 passes through the upper exhaust hole 102, the upper annular cavity, the air inlet through hole 1103, and the inner cavity of the upper end cover 11 in sequence, and then is discharged from the smoke exhaust port 1104 and enters the smoke exhaust pipe. Figure 1 and Figure 2 shown.

[0048] The unpressurized high-temperature cooling water discharged from the drain port 701 can enter the return water tank 1302 after passing through the Venturi pump 1301. The Venturi pump 1301 uses the pressurized return water (0.3MPa) as the drainage medium to form a vacuum state in the pipe, and can guide the unpressurized water after spraying into the return water tank 1302. After entering the return water tank 1302, the unpressurized water is pressurized by the return water pump connected to the return water tank 1302, and a small part of it is supplied to the Venturi pump 1301 as a drainage medium, and most of it is returned to the cooling tower 1303 for cooling. The cooled cooling water is then pressurized to 0.3MPa by the water supply pump and re-supplied to the furnace cover for use. Figure 5 shown.

[0049] In order to facilitate understanding and description, the present invention adopts the method of combining absolute position relationship to express, wherein the directional word "up" means Figure 2 The upward direction in the Figure 2 The present invention is described using the reader's observation perspective, but the above-mentioned directional words cannot be understood or interpreted as limiting the protection scope of the present invention.

[0050] As described above, the above are only specific embodiments of the present invention, and the scope of the invention cannot be limited thereby. Therefore, the replacement of equivalent components, or equivalent changes and modifications made in accordance with the scope of protection of the present invention, should still fall within the scope covered by this patent. In addition, the technical features in the present invention, between technical features, between technical features and technical solutions, and between technical solutions can be freely combined and used.

Claims

1. A gas-water compound spray cooling electric furnace cover, characterized in that, the gas-water compound spray cooling electric furnace cover includes an upper cover plate (1), a lower cover plate (3), an outer vertical plate (7) and an inner vertical plate (8). The upper cover plate (1) and the lower cover plate (3) are arranged at intervals up and down to form a receiving space. A compressed air supply branch pipe (4), a cooling water supply branch pipe (5) and a gas-water compound nozzle (6) are arranged in the receiving space. The gas-water compound nozzle (6) is respectively connected with the compressed air supply branch pipe (4) and the cooling water supply branch pipe (5). The gas-water compound nozzle (6) can spray a gas-water mixture downward onto the lower cover plate (3). A drain port (701) is provided at the lower part of the outer vertical plate (7). The inner vertical plate (8) is located inside the outer vertical plate (7), and the lower cover plate (3) is located between the outer vertical plate (7) and the inner vertical plate (8); both the upper cover plate (1) and the lower cover plate (3) are in a conical structure; a cooling water supply main pipe (10) is provided between the upper cover plate (1) and the inner vertical plate (8). The cooling water supply main pipe (10) is in an annular structure, and the cooling water supply branch pipe (5) is communicated with the cooling water supply main pipe (10); the cooling water supply main pipe (10) is formed by sequentially connecting an inner vertical plate (8), an upper end ring (1001), an outer sleeve (1002) and a lower end ring (1003). The outer sleeve (1002) is sleeved outside the inner vertical plate (8); the gas-water compound spray cooling electric furnace cover further includes an upper end cover (11). The upper end cover (11) contains a circular plate section (1101) and an inner cylindrical section (1102) connected up and down. The lower end of the inner cylindrical section (1102) is hermetically connected with the upper end ring (1001), and a smoke exhaust port (1104) is provided on the inner cylindrical section (1102); a smoke exhaust pipe is connected outside the smoke exhaust port (1104); an exhaust sleeve (12) is sleeved outside the upper end cover (11). An upper annular cavity is formed between the exhaust sleeve (12) and the upper end cover (11). The exhaust sleeve (12) contains a circular ring section (1201) and an outer cylindrical section (1202) connected up and down. The circular ring section (1201) is hermetically connected with the upper end cover (11), and the outer cylindrical section (1202) is hermetically connected with the upper cover plate (1). An upper exhaust hole (102) is provided at the inner edge of the upper cover plate (1), and an air intake through hole (1103) is provided on the inner cylindrical section (1102). The gas in the receiving space can sequentially enter the inner cavity of the upper end cover (11) through the upper exhaust hole (102), the upper annular cavity and the air intake through hole (1103); the gas in the inner cavity of the upper end cover (11) can enter the smoke exhaust pipe through the smoke exhaust port (1104).

2. The gas-water compound spray cooling electric furnace cover according to claim 1, characterized in that, a bracket (2) is provided between the upper cover plate (1) and the lower cover plate (3). The compressed air supply branch pipe (4) extends along the diameter direction of the gas-water compound spray cooling electric furnace cover, and the cooling water supply branch pipe (5) also extends along the diameter direction of the gas-water compound spray cooling electric furnace cover. The compressed air supply branch pipe (4) and the cooling water supply branch pipe (5) are connected in one-to-one correspondence.

3. The gas-water compound spray cooling electric furnace cover according to claim 1, It is characterized in that a main compressed air supply pipe (9) is provided between the upper cover plate (1) and the outer vertical plate (7), the main compressed air supply pipe (9) is in an annular structure, and the compressed air supply branch pipes (4) are communicated with the main compressed air supply pipe (9).

4. The gas-water composite spray cooling electric furnace cover according to claim 1, It is characterized in that a maintenance hole and a maintenance cover plate (101) are provided on the upper cover plate (1), and a water collecting tank (301) is provided at the outer end of the lower cover plate (3).

5. The gas-water composite spray cooling electric furnace cover according to claim 1, It is characterized in that the upper cover plate (1) is hermetically connected to the outer sleeve (1002).

6. An electric furnace, It is characterized in that the electric furnace includes a return water supply system (13) and the gas-water composite spray cooling electric furnace cover according to claim 1, the return water supply system (13) is connected to the drain port (701), and the return water supply system (13) can supply cooling water into the cooling water supply branch pipes (5).

7. The electric furnace according to claim 6, It is characterized in that the return water supply system (13) includes a Venturi pump (1301), a return water tank (1302) and a cooling tower (1303), the drain port (701) is connected to the suction port (13011) of the Venturi pump (1301) through a first drain pipeline (1304), the discharge port (13012) of the Venturi pump (1301) is connected to the inlet of the return water tank (1302) through a second drain pipeline (1305), the water in the return water tank (1302) can enter the injection port (13013) of the Venturi pump (1301), the water in the return water tank (1302) can also enter the cooling tower (1303), and the cooling tower (1303) can supply cooling water into the cooling water supply branch pipes (5) through a third drain pipeline (1306).

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