Hot refining furnace for producing medium and low carbon chromite

Abstract

The invention relates to the technical field of iron ore smelting, and provides a hot refining furnace for producing medium-low carbon chromite, which comprises a first platform, a second platform, a furnace tilting device, a furnace body, a full-dry low smoke hood, an electrode lifting device, a conductive cross arm, a waste heat utilization device, a transformer, a hydraulic system, a water cooling system and the like, the full-dry type low smoke hood is arranged on the furnace body and seals the upper end of the furnace body, and a furnace hood protection mechanism is fixedly installed at the upper end of the first platform. The full-dry-type low smoke hood is innovatively designed and is of a full-dry-type water-free structure, compared with a traditional water-cooling low smoke hood, the full-dry-type low smoke hood is simple in structure, manufacturing and maintenance cost is saved, the inner smoke hood coaxially arranged with the full-dry-type low smoke hood in a sleeving mode protects the inner wall of the full-dry-type low smoke hood, slag which is not prone to being removed is prevented from occurring on the inner wall of a furnace body, and the service life of the furnace body is prolonged. And the electrode is limited through the full-dry low smoke hood and the inner smoke hood at the same time, so that the problem that the electrode is inclined and broken during lifting adjustment above the furnace body is solved.

Description

Technical Field

[0001] The invention relates to the technical field of iron ore smelting, and in particular to a hot refining furnace for producing medium and low carbon chromite. Background Art

[0002] The refining furnace is a smelting equipment in the hot processing industry, and is mostly used for the final deoxidation and alloying process of molten steel in ferrous metallurgy. In the prior art, the low smoke hood of the submerged arc furnace is traditionally a water-through smoke hood structure, which is a cylindrical outer wall enclosure plus a flat furnace cover structure. During long-term production, the furnace cover is baked by the flames in the furnace for a long time, and the flat furnace cover is greatly deformed, often accompanied by the shedding of the refractory material of the furnace cover, water leakage and other phenomena. Therefore, the traditional smoke hood has a short life, a high accident rate, and frequent maintenance, which greatly affects the service life of the submerged arc furnace and causes losses to the enterprise. In addition, slag is easy to form on the furnace cover and is not easy to remove, and continuous arcing is easy to occur. Due to being at high temperature for a long time, the service life of the furnace cover is relatively low.

[0003] Therefore, we have made improvements on this and proposed a hot refining furnace for producing medium and low carbon chromite. Summary of the invention

[0004] The object of the present invention is to provide a hot refining furnace for producing medium and low carbon chromite to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned invention object, the present invention provides a hot refining furnace for producing medium and low carbon chromite, including a first platform, a second platform, a furnace tilting device, a furnace body, a full-dry short smoke hood, an electrode lifting device and a conductive cross arm, a waste heat utilization device, a transformer, a hydraulic system, a water cooling system and the like. The full-dry short smoke hood is arranged on the furnace body and the upper end of the furnace body is closed. A furnace hood protection mechanism is fixedly installed on the upper end of the first platform. The furnace hood protection mechanism includes a bracket and an inner smoke hood. A plurality of lifting mechanisms are installed on the bracket. A smoke outlet is provided at the edge of the inner smoke hood. A filter plate is sleeved inside the opening, and a convex tooth is fixedly connected to the bottom end of the filter plate, a transmission gear is connected to one side of the convex tooth, and a drive motor is connected to one side of the transmission gear. An electrode hole for inserting an electrode is provided on the full-dry low smoke hood, and the electrode is movably inserted into the electrode hole and fixedly connected to the electrode lifting device. A waste heat utilization device is connected to the inner smoke hood, and the waste heat utilization device is fixedly installed on the second platform, and the bottom end of the waste heat utilization device is also connected to the full-dry low smoke hood, and a plurality of slings are connected to the upper end of the inner smoke hood, and the upper ends of the slings are connected to the lifting mechanism.

[0006] As a further solution of the present invention, the fully dry low smoke hood is a fully dry waterless structure, the side walls of the fully dry low smoke hood are built with refractory bricks, the furnace door is knotted with refractory materials, multiple operating doors are arranged on the side walls, and an automatically lifting large furnace door, the top cover is a spherical structure, and aluminum silicate fiber blankets, zirconium-containing fiber membrane blocks and their anchors are laid inside.

[0007] As a further solution of the present invention, the furnace tilting device includes two bases, which are symmetrically installed at the bottom of the furnace body, and two rollers are connected to the upper ends of the bases respectively, and the rollers are rotatably connected to the bottom circular surface of the furnace body. As a further solution of the present invention, three electrode holes, four feeding holes and two smoke exhaust holes are arranged on the round cover of the fully dry low smoke hood, and the smoke exhaust holes are fixedly connected to the smoke exhaust pipes. Three electrode holes and four feeding holes are arranged on the inner smoke hood, and electrode sealing devices are arranged on the electrode holes.

[0008] As a further solution of the present invention, the sandwiching walls on both sides of the smoke outlet are provided with a plurality of notches, and both sides of the notches are provided with chamfers, which are tangent to the filter plate.

[0009] As a further scheme of the present invention, the waste heat utilization device includes two flues, a smoke outlet pipe is fixedly connected to the bottom of the flue, the smoke outlet pipe is fixedly connected to the smoke exhaust pipe, one end of the flue is fixedly connected to the main pipe, the other end of the flue is fixedly connected to the ventilation fan, and a silo is also sleeved in the middle of the flue, a feed pipe is fixedly connected to the bottom end of the silo, and the feed pipe is fixedly connected to the feeding hole of the inner smoke hood.

[0010] As a further solution of the present invention, four scrapers are fixedly connected to the bottom end of the filter plate, and the scrapers are close to the inner wall of the furnace body and penetrate into the interior of the furnace body.

[0011] As a further solution of the present invention, the full-dry low smoke hood is coaxially sleeved outside the inner smoke hood, and the inner smoke hood is a dome structure.

[0012] As a further solution of the present invention, all openings on the full-dry low smoke hood and the inner smoke hood are insulated and electrically insulated using corundum casting material.

[0013] The invention provides a thermal refining furnace for producing medium and low carbon chromite, which has the following beneficial effects: 1. Through the innovative design of the full-dry low smoke hood, a full-dry waterless structure is adopted. The side walls of the full-dry low smoke hood are built with refractory bricks, the furnace door refractory materials are tied, and all openings are insulated and insulated with corundum casting materials. Compared with the traditional water-cooled low smoke hood, the structure is simple, convenient to manufacture, and saves manufacturing and maintenance costs. In addition, a coaxially sleeved inner smoke hood is arranged at the bottom of the full-dry low smoke hood. The inner smoke hood protects the inner wall of the full-dry low smoke hood to avoid slag that is difficult to remove on the inner wall of the furnace body. The full-dry low smoke hood and the inner smoke hood are used to limit the electrode at the same time, so as to facilitate the problem of tilting and breaking of the electrode when it is raised and lowered above the furnace body.

[0014] 2. Compared with the traditional structure in which the smoke exhaust duct and the silo are independently separated, the present application wraps the silo inside the flue, which protects the silo when the cold material is preheated. The raw material is preheated before entering the furnace. Compared with the traditional mineral thermal refining furnace in which raw material is fed into the furnace, the heat carried away by the exhaust gas discharged from the furnace is used to preheat the raw material in the silo, thereby turning waste into treasure, extending the service life, reducing maintenance and repair costs, improving various indicators of smelting production, and playing a role in energy saving and consumption reduction.

[0015] 3. An independent inner smoke hood is arranged inside the full-dry low smoke hood. The inner smoke hood is pulled up and down by a lifting mechanism to ensure a closed environment inside the furnace body, isolate the air inside and outside the furnace, ensure a slightly positive pressure atmosphere in the furnace, and achieve and promote uniform reflection in the furnace. At the same time, multiple notches are opened on the side of the inner smoke hood, and rotatable and adjustable filter plates are arranged in the notches. When the inner smoke hood and the furnace body are closed, the flue gas is filtered and discharged through the notch and the filter plate at the edge of the smoke outlet. The driving motor and the transmission gear drive the filter plate to rotate, so that the chamfer of the notch edge of the smoke outlet is pressed against the rotating filter plate to clean the slag on the filter plate and ensure smooth discharge of the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a thermal refining furnace for producing medium and low carbon chromite provided in this application; Figure 2 A structural cross-sectional view of a thermal refining furnace for producing medium and low carbon chromite provided in this application; Figure 3 A schematic diagram of the structure of a furnace tilting device for producing a medium- and low-carbon chromite hot refining furnace provided in this application; Figure 4A schematic diagram of the structure of a furnace hood protection mechanism for a hot refining furnace for producing medium and low carbon chromite provided in this application; Figure 5 A schematic diagram of the inner smoke hood structure of a hot refining furnace for producing medium and low carbon chromite provided in this application; Figure 6 A schematic diagram of the structure of a waste heat utilization device for a hot refining furnace for producing medium and low carbon chromite provided in this application; Figure 7 A cross-sectional view of a waste heat utilization device for a hot refining furnace for producing medium and low carbon chromite provided in the present application; Figure 8 for Figure 4 A partial enlarged schematic diagram of the structure.

[0018] In the figure: 1. first platform; 2. second platform; 3. furnace tilting device; 31. base; 32. roller; 4. furnace body; 5. full dry low smoke hood; 6. electrode lifting device; 7. smoke exhaust duct; 8. waste heat utilization device; 81. flue; 82. smoke outlet pipe; 83. main pipe; 84. ventilation fan; 85. silo; 86. feed pipe; 9. furnace hood protection mechanism; 91. bracket; 92. lifting mechanism; 93. sling; 94. inner smoke hood; 95. filter plate; 96. smoke outlet; 97. convex teeth; 98. scraper; 99. transmission gear; 910. drive motor. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples of the specification. The following examples are only used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0020] like Figure 1-Figure 8As shown, the present embodiment proposes a hot refining furnace for producing medium and low carbon chromite, comprising a first platform 1, a second platform 2, a furnace tilting device 3, a furnace body 4, a full dry type short smoke hood 5, an electrode lifting device 6 and a conductive cross arm, a waste heat utilization device 8, a transformer, a hydraulic system, a water cooling system and the like. The full dry type short smoke hood 5 is arranged on the furnace body 4 and closes the upper end of the furnace body 4. A furnace hood protection mechanism 9 is fixedly installed on the upper end of the first platform 1. The furnace hood protection mechanism 9 comprises a bracket 91 and an inner smoke hood 94. A plurality of lifting mechanisms 92 are installed on the bracket 91. A smoke outlet 96 is provided at the edge of the inner smoke hood 94. A filter plate 95 is sleeved inside the smoke outlet 96. A convex tooth 97 is fixedly connected to the bottom end of the filter plate 95. One side of the convex tooth 97 is connected to There is a transmission gear 99, and a driving motor 910 is connected to one side of the transmission gear 99. An electrode hole for inserting an electrode is provided on the full-dry low smoke hood 5. The electrode is movably inserted in the electrode hole and fixedly connected to the electrode lifting device 6. A waste heat utilization device 8 is connected to the inner smoke hood 94. The waste heat utilization device 8 is fixedly installed on the second platform 2, and the bottom end of the waste heat utilization device 8 is also connected to the full-dry low smoke hood 5. A plurality of slings 93 are connected to the upper end of the inner smoke hood 94, and the upper ends of the slings 93 are connected to the lifting mechanism 92. Compared with the traditional structure in which the smoke exhaust pipe and the silo are independently separated, the smoke exhaust pipe is wrapped around the outside of the silo, which protects the silo when the cold material is preheated, extends the service life, and reduces the maintenance cost.

[0021] The fully dry low smoke hood 5 is a fully dry waterless structure. The side walls of the fully dry low smoke hood 5 are built with refractory bricks, the furnace door is knotted with refractory materials, multiple operating doors are arranged on the side walls, and an automatic lifting large furnace door is arranged. The top cover is a spherical structure, and aluminum silicate fiber blankets, zirconium-containing fiber membrane blocks and their anchors are laid inside. Compared with traditional water-cooled low smoke hoods, the structure is simple, easy to manufacture, and saves manufacturing and repair and maintenance costs.

[0022] The furnace tilting device 3 includes two bases 31, which are symmetrically installed at the bottom of the furnace body 4. Two rollers 32 are respectively connected to the upper ends of the bases 31. The rollers 32 are rollingly connected to the bottom circular surface of the furnace body 4. The rollers 32 are externally driven to drive the furnace body 4 to flip over, so that the molten iron inside the furnace body 4 is poured out.

[0023] Three electrode holes, four feeding holes and two smoke exhaust holes are arranged on the round cover of the full-dry low smoke hood 5, and a smoke exhaust pipe 7 is fixedly connected to the smoke exhaust hole. Three electrode holes and four feeding holes are arranged on the inner smoke hood 94, and electrode sealing devices are arranged on the electrode holes. The full-dry low smoke hood 5 and the inner smoke hood 94 are both buckled on the top of the furnace body 4. The inner smoke hood 94 protects the inner wall of the full-dry low smoke hood 5 to prevent the flame in the furnace from directly baking the inner wall of the full-dry low smoke hood 5. At the same time, it also prevents the inner wall of the furnace body 4 from slagging that is difficult to remove. It is more labor-saving and convenient to replace the inner smoke hood 94 alone.

[0024] Multiple notches are provided on the two side walls of the smoke outlet 96, and chamfers are provided on both sides of the notches, which are tangent to the filter plate 95. The smoke outlet 96 and the filter plate 95 are sleeved together, so that the smoke inside the furnace body 4 is discharged through the notches of the smoke outlet 96, and during the discharge process, the filter plate 95 is used to filter the residue in the smoke, and the ash is separated in the filter plate 95. During the rotation of the filter plate 95, the chamfer of the smoke outlet 96 shovels the surface of the filter plate 95 to clean the ash attached to the filter plate 95.

[0025] The waste heat utilization device 8 includes two flues 81, a smoke outlet pipe 82 is fixedly connected to the bottom of the flue 81, the smoke outlet pipe 82 is fixedly connected to the smoke exhaust pipe 7, one end of the flue 81 is fixedly connected to the main pipe 83, the other end of the flue 81 is fixedly connected to the ventilation fan 84, and a silo 85 is also sleeved in the middle of the flue 81, a feed pipe 86 is fixedly connected to the bottom end of the silo 85, and the feed pipe 86 is fixedly connected to the feeding hole of the inner smoke hood 94. The flue gas generated by refining in the furnace body 4 enters the flue 81 through the smoke outlet pipe 82, and the waste heat is used for the silo 85 wrapped in the middle of the flue 81 and the cold material inside it, so as to make full use of the heat of the high-temperature flue gas and play a role in energy saving and consumption reduction.

[0026] Four scrapers 98 are fixedly connected to the bottom end of the filter plate 95. The scrapers 98 are close to the inner wall of the furnace body 4 and penetrate into the interior of the furnace body 4. After the inner smoke hood 94 is buckled on the furnace body 4, the convex teeth 97 are connected to the drive motor 910. Driven by the drive motor 910, the scrapers 98 rotate along with the filter plate 95. The scrapers 98 stir the metal inside the furnace body 4 to ensure that the mass transfer and heat transfer process of the metal molten pool are promoted during the melting of the metal, and the composition and temperature of the molten metal are uniform, the slag and metal are mixed, the solid material is melted faster, the smelting time is shortened, and the removal of harmful elements is accelerated, so as to finally improve the product quality and productivity.

[0027] The full-dry low smoke hood 5 is coaxially sleeved outside the inner smoke hood 94. The inner smoke hood 94 is a dome structure. The inner smoke hood 94 is installed in the full-dry low smoke hood 5 to cover the top of the furnace body 4 to prevent the interior of the furnace body 4 from being baked by the flames in the furnace for a long time, which may cause deformation and shedding of refractory materials. It also prevents the inner wall of the full-dry low smoke hood 5 from forming metal slag that is difficult to remove, which may cause arcing of the electrode. At the same time, the inner smoke hood 94 is movably installed, which is easier to replace than the full-dry low smoke hood 5, thereby extending the service life of the full-dry low smoke hood 5.

[0028] All openings on the full dry low smoke hood 5 and the inner smoke hood 94 are insulated and insulated with corundum casting materials, and the openings are connected to the electrode feed to avoid leakage at the electrode connection and to avoid damage to the openings caused by high temperature baking in the furnace.

[0029] Specifically, when the hot refining furnace of low-carbon chromite in the production is in use: an inner smoke hood 94 is coaxially sleeved below the full-dry short smoke hood 5, and the inner smoke hood 94 is pulled up and down by a lifting mechanism 92 to ensure a closed environment inside the furnace body 4 and isolate the air inside and outside the furnace. A rotatable and adjustable filter plate 95 is arranged on the side of the inner smoke hood 94, and the flue gas is discharged through the notch on the side of the smoke outlet 96 and the filter plate 95 and enters the smoke outlet pipe 82. The heat carried away by the exhaust gas discharged from the furnace is used to preheat the silo 85, and the silo 85 is wrapped inside the flue 81. The flue gas is in the smoke outlet pipe 82. The raw material and cold material in the silo 85 are preheated to save energy and reduce consumption. The electrodes on the full-dry low smoke hood 5 release electric energy in the form of electric arc to heat and melt the charge. After melting, the furnace tilting device 3 drives the furnace body 4 to tilt, and the molten iron in the furnace body 4 is poured out. The driving motor 910 and the transmission gear 99 drive the filter plate 95 to rotate, so that the chamfer of the notch edge of the smoke outlet 96 is performed on the rotating filter plate 95, and the slag on the filter plate 95 is cleaned to ensure smooth discharge of smoke. The contents not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field.

[0030] The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A hot refining furnace for producing medium and low carbon chromite, comprising a first platform (1), a second platform (2), a furnace tilting device (3), a furnace body (4), a full dry low smoke hood (5), an electrode lifting device (6) and a conductive cross arm, a waste heat utilization device (8), a transformer, a hydraulic system, a water cooling system and the like, characterized in that: The fully dry low smoke hood (5) is arranged on the furnace body (4) and closes the upper end of the furnace body (4); a furnace hood protection mechanism (9) is fixedly installed on the upper end of the first platform (1); the furnace hood protection mechanism (9) comprises a bracket (91) and an inner smoke hood (94); a plurality of lifting mechanisms (92) are installed on the bracket (91); a smoke outlet (96) is provided at the edge of the inner smoke hood (94); a filter plate (95) is sleeved inside the smoke outlet (96); a convex tooth (97) is fixedly connected to the bottom end of the filter plate (95); a transmission gear (99) is connected to one side of the convex tooth (97); A driving motor (910) is connected to one side of the transmission gear (99); an electrode hole for inserting an electrode is provided on the full-dry low smoke hood (5); the electrode is movably inserted into the electrode hole and is fixedly connected to the electrode lifting device (6); a waste heat utilization device (8) is connected to the inner smoke hood (94); the waste heat utilization device (8) is fixedly mounted on the second platform (2), and the bottom end of the waste heat utilization device (8) is also connected to the full-dry low smoke hood (5); a plurality of slings (93) are connected to the upper end of the inner smoke hood (94); and the upper ends of the slings (93) are connected to the lifting mechanism (92).

2. A hot refining furnace for producing medium and low carbon chromite according to claim 1, characterized in that: The fully dry low smoke hood (5) is a fully dry waterless structure. The side walls of the fully dry low smoke hood (5) are built with refractory bricks. The furnace door is knotted with refractory materials. The side walls are provided with multiple operating doors and an automatically lifting large furnace door. The top cover is a spherical structure, and aluminum silicate fiber blankets, zirconium-containing fiber membrane blocks and their anchors are laid inside.

3. A thermal refining furnace for producing medium and low carbon chromite according to claim 1, characterized in that: The furnace tilting device (3) comprises two bases (31), the two bases (31) being symmetrically mounted on the bottom of the furnace body (4), two rollers (32) being respectively connected to the upper ends of the bases (31), and the rollers (32) being rollingly connected to the bottom circular surface of the furnace body (4).

4. A hot refining furnace for producing medium and low carbon chromite according to claim 1, characterized in that: The round cover of the full-dry low smoke hood (5) is provided with three electrode holes, four feeding holes, and two smoke exhaust holes, and the smoke exhaust holes are fixedly connected to the smoke exhaust pipes (7), and the inner smoke hood (94) is provided with three electrode holes and four feeding holes, and the electrode holes are provided with electrode sealing devices.

5. A hot refining furnace for producing medium and low carbon chromite according to claim 1, characterized in that: The walls on both sides of the smoke outlet (96) are provided with a plurality of notches, and both sides of the notches are provided with chamfers, which are tangent to the filter plate (95).

6. A hot refining furnace for producing medium and low carbon chromite according to claim 4, characterized in that: The waste heat utilization device (8) comprises two flues (81), the bottom of each flue (81) is fixedly connected to a smoke outlet pipe (82), the smoke outlet pipe (82) is fixedly connected to a smoke exhaust pipe (7), one end of each flue (81) is fixedly connected to a main pipe (83), the other end of each flue (81) is fixedly connected to a ventilation fan (84), and a silo (85) is sleeved in the middle of each flue (81), the bottom end of each silo (85) is fixedly connected to a feed pipe (86), and the feed pipe (86) is fixedly connected to a feed hole of an inner smoke hood (94).

7. A hot refining furnace for producing medium and low carbon chromite according to claim 1, characterized in that: Four scrapers (98) are fixedly connected to the bottom end of the filter plate (95), and the scrapers (98) are close to the inner wall of the furnace body (4) and penetrate into the interior of the furnace body (4).

8. A hot refining furnace for producing medium and low carbon chromite according to claim 1, characterized in that: The full-dry low smoke hood (5) is coaxially sleeved outside the inner smoke hood (94), and the inner smoke hood (94) is a dome structure.

9. A hot refining furnace for producing medium and low carbon chromite according to claim 1, characterized in that: All openings on the full-dry low smoke hood (5) and the inner smoke hood (94) are insulated and electrically insulated using corundum casting material.

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