A charging device for LF refining furnace

Abstract

The utility model belongs to the field of metallurgical equipment, and specifically relates to a charging device for an LF refining furnace. The utility model includes a refining furnace body, a furnace cover is provided on the refining furnace body, electrodes are provided in the furnace cover, and multiple silos are provided. A weighing and feeding trolley is provided below the silo, and the weighing and feeding trolley is connected to a mixing tank through a one-way valve. A feed pipe is pre-buried in the furnace cover of the metering discharge silo located in the outer ring of the electrode, and the discharge port of the mixing tank is connected to the feed pipe, and a discharge hole is provided on the feed pipe. The furnace is fed with materials through an automated metering discharge silo, which avoids the time-consuming and labor-intensive manual feeding and the volatilization of materials caused by frequent opening of the furnace cover. The feeding system feeds accurately, mixes evenly and discharges smoothly, so that the refined slag of the LF refining furnace can be kept white slag stably for a long time. The blowing mechanism is pre-buried in the furnace cover of the refining furnace, and the discharge hole is located between the two electrodes of the outer ring, which avoids the contact between the material and the electrode during the discharge process.

Description

Technical Field

[0001] The utility model belongs to the field of metallurgical equipment, and in particular relates to a charging device for an LF refining furnace. Background Art

[0002] LF (Ladle Furnace) refining furnace is an important refining step in the iron and steel metallurgical process. It uses argon stirring, graphite electrode submerged arc heating in an atmospheric environment, and white slag refining technology. This method has the functions of desulfurization and deoxidation of strong reducing slag, and then control inclusions and heat up the molten ferroalloy with electric arc heating, and adjust the composition and temperature. Based on the advantages of simple equipment, low investment cost, flexible operation and stable effect, it has been widely used in the industry and occupies a dominant position in my country's out-of-furnace refining methods.

[0003] In the industry where high-quality steel is smelted in primary smelting furnaces such as medium frequency furnaces, electric arc furnaces, and converters, LF refining is an indispensable relay link. By making slag in the LF process, it can make up for the shortcomings of medium frequency furnaces that cannot make alkaline slag and cannot effectively remove impurity elements. It can also save the reduction period operation of the electric arc furnace and achieve the effect of deeply purifying the molten steel. At the same time, it can also solve the problems of temperature instability and the inability of inclusions to float caused by converter tapping and ladle deoxidation and alloying. The furnace capacity of this type of smelting furnace is generally small, and the temperature of the molten steel drops rapidly after tapping. The heating function of LF can effectively control the molten steel temperature and adjust the production rhythm.

[0004] Slag making is one of the most important operations in LF refining. In order to make white slag, lime, fluorite, deoxidizer and other slag materials need to be added in batches. The addition of slag materials accounts for a large proportion of the whole operation. In small and medium-sized LF refining, slag materials are generally added 3 to 6 times. At present, the overall feeding device of the domestic LF refining furnace is limited by the height and width of the built plant, and it is often impossible to set up a hopper-type automatic control feeding system. Granular materials such as carburizers and silicon carbide are still fed from the furnace door by manual shovels. The manual operation has high labor intensity for workers on the job, and there is a lot of smoke and dust when feeding. In addition, because the timing and position of addition are uncertain and unstable, the amount of addition depends on estimation and experience, which has an adverse effect on the smelting cycle and smelting effect. Frequent opening of the furnace door, in order to avoid the problem of volatilization waste caused by the contact and gasification of materials with high-temperature electrodes, requires frequent power outages and destroys the reducing atmosphere in the furnace. Utility Model Content

[0005] In view of the above problems existing in the prior art, the purpose of the utility model is to provide a LF refining furnace charging device.

[0006] In order to solve the above problems, the technical solution adopted by the utility model is as follows:

[0007] A LF refining furnace charging device comprises a refining furnace body, a furnace cover is arranged on the refining furnace body, electrodes are arranged in the furnace cover, and multiple silos are also included. A weighing feeding trolley is arranged below the silos, the weighing feeding trolley is connected to a mixing tank through a one-way valve, a feeding pipe is pre-buried in the furnace cover at the outer ring of the electrode, the discharge port of the mixing tank is connected to the feeding pipe, and a discharge hole is arranged on the feeding pipe.

[0008] Optionally, the discharge hole is arranged on the central axis of two adjacent electrodes.

[0009] Optionally, the inner diameter of the weighing and feeding trolley decreases from top to bottom, and a feeding port is provided on the weighing and feeding trolley. The feeding port is connected to the mixing tank, and a flap valve is provided at the feeding port.

[0010] Optionally, the mixing tank is connected to an air blowing pipeline via a valve, and an inert gas is passed through the air blowing pipeline.

[0011] Optionally, a vibrating feeder is provided at the discharge port below the silo.

[0012] Optionally, a stirring device is provided in the mixing tank.

[0013] Optionally, a fixed steel frame is also included, and the silo and the mixing tank are both connected to the fixed steel frame.

[0014] Optionally, three electrodes are symmetrically arranged along the center of the furnace cover, and three discharge holes are equidistantly arranged along the feed pipe.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model designs an automated weighing feeding trolley and a vibrating feeder to feed materials into the furnace, avoiding the time-consuming and labor-intensive manual feeding and frequent opening of the furnace cover and the volatilization of materials. The feeding system feeds accurately, mixes evenly and discharges smoothly, so that the LF refining furnace can keep the refined slag white for a long time. The injection mechanism is embedded in the furnace cover of the refining furnace, and the discharge hole is located between the two electrodes of the outer ring, so that the material discharge process is as far away from the electrode as possible, avoiding the contact between the material and the electrode during the discharge process, and better ensuring the stability of the slag refining system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of a charging device for a LF refining furnace;

[0018] Figure 2 This is a schematic diagram of the furnace cover structure;

[0019] In the figure: 1. furnace cover; 11. electrode; 12. feed pipe; 13. discharge hole; 2. silo; 3. fixed steel frame; 4. weighing and feeding trolley; 41. flap valve; 5. mixing tank; 6. air blowing pipe. DETAILED DESCRIPTION

[0020] The following will combine the embodiments of the present utility model to clearly and completely describe the technical solutions in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present utility model.

[0021] like Figure 1-Figure 2 As shown, a technical solution is provided below:

[0022] A charging device for an LF refining furnace comprises a refining furnace body, a furnace cover 1 is provided on the refining furnace body, an electrode 11 is provided in the furnace cover 1, and a plurality of silos 2 and a fixed steel frame 3 are provided. A weighing and feeding trolley 4 is provided below the silo 2. The weighing and feeding trolley 4 is connected to a mixing tank 5 through a one-way valve. A stirring device is provided in the mixing tank 5. The silo 2 and the mixing tank 5 are both connected to the fixed steel frame 3. A feeding pipe 12 is pre-buried in the outer ring of the electrode 11 in the furnace cover 1. The discharge port of the mixing tank 5 is connected to the feeding pipe 12. A discharge hole 13 is provided on the feeding pipe 12. The discharge hole 13 is provided on the central axis of two adjacent electrodes 11, so as to ensure that the discharge of the discharge hole 13 is as far away from the electrode 11 as possible, so that the material falls smoothly into the refining furnace body. In this embodiment, three electrodes 11 are symmetrically provided along the center of the furnace cover 1, and three discharge holes 13 are equidistantly provided along the feeding pipe 12.

[0023] The inner diameter of the weighing and feeding trolley 4 decreases from top to bottom and becomes a frustum. A material drop port is provided on the weighing and feeding trolley 4, and the material drop port is connected to the mixing tank 5. A flap valve 41 is provided at the material drop port. The flap valve 41 is closed during the material falling process. When the weighing and feeding trolley 4 detects that the material has reached the required amount, the flap valve 41 is opened, and the material can fall into the mixing tank 5.

[0024] The mixing tank 5 is connected to a blowing pipe 6 via a valve, and an inert gas is passed through the blowing pipe 6 .

[0025] A vibrating feeder is provided at the discharge port below the silo 2, and the vibrating feeder is opposite to the weighing feeding trolley 4 to ensure smooth material discharge.

[0026] Through the feeding device, materials such as carburizer, silicon carbide, submerged arc particles, deoxidized particles, etc. are added to the silo 2, and the vibrating feeder sends the materials to the weighing and feeding trolley 4. After reaching the required mass, the flap valve 41 on the weighing and feeding trolley 4 is opened, and the materials can fall into the mixing tank 5. After the different materials are evenly mixed in the mixing tank 5, they enter the feeding pipe 12, and the high-pressure inert gas is sprayed on the materials. The materials can fall into the refining furnace body along the discharge hole 13, and the feeding is completed.

[0027] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A charging device for a LF refining furnace, comprising a refining furnace body, a furnace cover (1) being arranged on the refining furnace body, and an electrode (11) being arranged in the furnace cover (1), characterized in that: It also comprises a plurality of silos (2), a weighing and feeding trolley (4) is provided below the silos (2), the weighing and feeding trolley (4) is connected to a mixing tank (5) via a one-way valve, a feeding pipe (12) is pre-buried in the furnace cover (1) at the outer ring of the electrode (11), the discharge port of the mixing tank (5) is connected to the feeding pipe (12), and a discharge hole (13) is provided on the feeding pipe (12); A vibrating feeder is provided at the discharge port below the silo (2).

2. The LF refining furnace charging device according to claim 1, characterized in that: The discharge hole (13) is arranged on the central axis of two adjacent electrodes (11).

3. The LF refining furnace charging device according to claim 1, characterized in that: The inner diameter of the weighing and feeding trolley (4) decreases from top to bottom. The weighing and feeding trolley (4) is provided with a material drop opening, which is connected to the mixing tank (5) and is provided with a flap valve (41).

4. The LF refining furnace charging device according to claim 1, characterized in that: The mixing tank (5) is connected to an air blowing pipeline (6) via a valve, and an inert gas is passed through the air blowing pipeline (6).

5. The LF refining furnace charging device according to claim 2, characterized in that: Three electrodes (11) are symmetrically arranged along the center of the furnace cover (1), and three discharge holes (13) are equidistantly arranged along the feed pipe (12).

6. The LF refining furnace charging device according to claim 1, characterized in that: A stirring device is arranged in the mixing tank (5).

7. The LF refining furnace charging device according to claim 1, characterized in that: It also comprises a fixed steel frame (3), and the silo (2) and the mixing tank (5) are both connected to the fixed steel frame (3).

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