Process system for rapidly replacing slag ladle in electric furnace smelting

Abstract

The invention relates to an electric furnace smelting rapid slag pot replacement process system which comprises a group of electric furnaces, two groups of slag pot cars and a herringbone track cross transport line, each group of slag pot cars is provided with a slag pot body, and the herringbone track cross transport line comprises a first slag pot car track and a second slag pot car track. The first slag pot car track and the second slag pot car track are converged through a herringbone track cross block and then merged into a slag receiving station, and the slag receiving station is located under a furnace door opening of the electric furnace. Compared with the prior art, the two special-shaped slag pot cars and the two herringbone crossed rail transport lines which form a certain angle are arranged, and the two slag pot cars can be rapidly replaced within 1.5 minutes. The slag receiving efficiency of the slag tank is improved, and relatively continuous slag receiving is achieved. The slag tanks are rapidly replaced through the two slag tank trucks and are coordinated with production operation, the phenomenon that no slag tank overflows slag at the slag receiving position in the smelting process is eradicated, slag is prevented from being discharged to a furnace lower channel, and the environment and safety of the furnace lower channel are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of electric furnace steelmaking, and in particular relates to a process system for quickly replacing slag pots in electric furnace smelting. Background Art

[0002] Electric furnace slag is a solid waste discharged during the process of smelting metals in an electric furnace. Slag is an important phase involved in various metallurgical reactions, and has the function of removing impurities in steel and protecting molten steel. In the process of electric furnace smelting, a large amount of slag will be produced. Reducing the amount of slag in the molten steel during the steelmaking process of the electric furnace is an important guarantee for improving the quality of steel. The density of slag is lighter than that of molten steel, and it floats on the surface of molten steel. Before the electric furnace is tapped, the slag is poured out from the furnace door. At present, there are two ways to slag. One is hot slag pouring in front of the furnace. The liquid foam slag flows directly from the furnace door of the electric furnace to the ground under the furnace in front of the furnace. The ground is covered with silica sand and cast iron plates are covered on the sand. After slag is discharged, it is cooled and pulverized by pumping water under the furnace, and then transported away by a forklift after cooling. Another way is to pour the slag directly into the slag tank on the slag tank car under the furnace, and then lift it away by a crane. Hot slag pouring in front of the furnace has safety hazards, and it produces a large amount of steam and smoke, and the environment is harsh. Currently, the slag is basically poured into a slag pot and then transported to a slag yard for treatment.

[0003] At present, the existing technology sets a slag tank car and a slag tank car transportation line under the electric furnace, and places a slag tank on the slag tank car to carry out the slag receiving operation in front of the furnace. When the slag tank on the slag tank car is full of slag, the slag tank car drives out of the platform in front of the furnace, and the heavy slag tank is lifted away by the overhead crane, and then an empty slag tank is lifted and placed on the slag tank car. The slag tank car then drives into the slag receiving station and waits for slag receiving. It takes at least 8 minutes to replace the slag tank. During the replacement of the slag tank, slag overflow may occur in the electric furnace, and relatively continuous slag receiving cannot be achieved during this period. Some steel companies increase the slag pot or adopt a double slag pot type to meet the storage of slag from multiple furnaces. China's utility model patent is a slag tank car (patent number: CN 2001762374 U). This utility model places two slag pots on a car body, which significantly improves the slag discharge capacity of the slag car, but does not fundamentally solve the problem of relatively continuous slag receiving.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The object of the present invention is to provide a slag pot rapid replacement process system for electric furnace smelting. The slag pot rapid replacement process system for electric furnace smelting can effectively shorten the slag pot replacement time, improve the slag pot online slag connection efficiency, and achieve relatively continuous slag connection.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A process system for quickly replacing slag pots in electric furnace smelting comprises a group of electric furnaces, two groups of slag pot cars and a herringbone track cross-transport line, each group of the slag pot cars is provided with a slag pot body, the herringbone track cross-transport line comprises a first slag pot car track and a second slag pot car track, the first slag pot car track and the second slag pot car track are merged through a herringbone track cross block and then incorporated into a slag receiving station, and the slag receiving station is located directly below the furnace door of the electric furnace.

[0008] Preferably, the wheels of the slag tank car are of single rim type.

[0009] Preferably, the slag pot truck is provided with a supporting seat, and the slag pot body is placed on the supporting seat.

[0010] Preferably, a counterweight is provided on the non-slag discharge side of the slag tank car.

[0011] Preferably, the center line of the bracket is parallel to the track line of the crane for lifting the slag pot body in the workshop.

[0012] Preferably, the angle between the first slag tank car track and the second slag tank car track is 15 degrees.

[0013] Preferably, the herringbone track crossing block 5 is provided with a notch at the wheel rim.

[0014] Preferably, the distance between the slag receiving station and the starting waiting station of the slag tank truck is 20-25 meters.

[0015] Compared with the prior art, the present invention proposes a rapid replacement slag pot process system for electric furnace smelting. By setting two special-shaped slag pot cars and two herringbone cross-track transport lines at a certain angle to each other, the two slag pot cars can be quickly replaced within 1.5 minutes. The efficiency of slag pot slag connection is improved, and relatively continuous slag connection is achieved. The rapid replacement of slag pots by two slag pot cars is coordinated with production operations to prevent the phenomenon of slag overflow from the slag pot at the slag connection position during the smelting process, avoid the discharge of slag into the furnace, and ensure the environment and safety of the furnace.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0018] Figure 1This is a plan view of a process system for quickly replacing slag pots in an electric furnace smelting process proposed in an embodiment of the present invention.

[0019] Figure 2 A schematic diagram of a slag pot car in a slag pot rapid replacement process system for electric furnace smelting proposed in an embodiment of the present invention.

[0020] Figure 3 This is a layout diagram of herringbone track cross blocks in a process system for quickly replacing slag pots in an electric furnace smelting process proposed in an embodiment of the present invention.

[0021] Figure 4 A schematic structural diagram of a herringbone track cross block in a process system for quickly replacing slag pots in an electric furnace smelting proposed in an embodiment of the present invention.

[0022] The diagram is as follows:

[0023] 1. Waiting station; 2. Slag tank body; 3. Slag tank car; 4. Slag tank car track; 5. Herringbone track cross block; 6. Slag receiving station; 7. Special-shaped slag tank car support; 8. Counterweight. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0025] like Figure 1 As shown, an electric furnace smelting rapid replacement slag pot body process system proposed in an embodiment of the present invention includes a group of electric furnaces, two groups of slag pot cars 3 and a herringbone track cross-transport line, each group of the slag pot cars 3 is provided with a slag pot body, the herringbone track cross-transport line includes a first slag pot car track and a second slag pot car track, the first slag pot car track and the second slag pot car track are merged through the herringbone track cross block 5 and then merged into the slag receiving station 6, the slag receiving station 6 is located directly below the furnace door of the electric furnace. The first slag pot car track and the second slag pot car track are combined to form a slag pot car track 4.

[0026] The present invention specifically describes a method for realizing continuous slag connection operation of a slag tank body, such as Figure 1As shown, the specific steps include: first, two slag tank cars 3 are respectively arranged at the initial waiting stations 1 of the two slag tank cars 3. An empty slag tank body is placed on each slag tank car 3. When the electric furnace starts smelting, a slag tank car 3 is first driven from the waiting station 1 of the first slag tank car track through the slag tank car track 4 and the herringbone track intersection block 5 to the slag receiving station 6, waiting for slag discharge from the furnace door. During the smelting process, the slag discharge operation can be carried out at the furnace door of the electric furnace at any time. In this embodiment, an empty slag tank body can accommodate two furnaces of slag. The smelting cycle of each furnace of the electric furnace is 33-40 minutes. When the electric furnace completes the smelting of two furnaces, the slag tank car 3 completes the slag receiving work. The slag tank car 3 located at the slag receiving station 6 passes through the herringbone track intersection block 5 and the slag tank car track 4 to drive out of the slag receiving station 6 and return to the initial waiting station 1. At the same time, the slag tank car 3 located at the waiting station 1 on the second slag tank car track passes through the slag tank car track 4 and the herringbone track intersection block 5 to drive into the slag receiving station 6, and the two slag tank cars 3 are quickly replaced. The walking speed of the slag tank car 3 is 3-30min / min, and the distance between the slag receiving station 6 and the waiting station 1 is generally about 20-25m. The two slag tank cars 3 can basically be quickly replaced in 1.5 minutes. During the replacement of the two slag tank cars 3, the electric furnace is in a charging state, and there is no overflow of the electric furnace slag. After the slag tank car 3 filled with slag drives to the waiting station 11, there is ample time to wait for the workshop crane to lift it, avoiding the phenomenon of grabbing the overhead crane.

[0027] like Figure 2 As shown, the bracket is a steel structure bracket, and the center line of the bracket is parallel to the track line of the workshop crane for lifting the slag tank body, ensuring that the direction of the plate hook of the slag tank body is consistent with the direction of the ear axis of the slag tank body, which is convenient for the crane operator to operate. Since the frame of the slag tank car 3 is short near the slag discharge side, and considering that the slag tank body is heavy, a counterweight 8 is set on the non-slag discharge side of the car body to ensure the smooth and reliable operation of the slag tank body 2. When the crane is idle, the full slag tank body is hoisted to the storage area through the plate hook, and then an empty slag tank body is hoisted and placed on the slag tank car 3, and waits at the waiting station 1 for the next replacement with the slag tank car 3 at the slag receiving station 6.

[0028] like Figure 3 and Figure 4As shown, the two ends of the herringbone track cross block 5 are respectively connected to the first transport line track and the second transport line track, and can be connected by a track connecting plate or welding. The connection part is required to be flat to facilitate the passage of the slag tank car 3. The wheels of the slag tank car 3 are of a single rim type, and the herringbone track cross block 5 is provided with a notch at the rim. The angle α of the herringbone track cross block 5 depends on the layout of the platform column and the electric furnace cradle foundation. If the angle is too large, the slag tank car 3 is likely to interfere with the electric furnace cradle foundation at the slag receiving station 6. At the same time, the large angle causes the platform column spacing span to be large and the platform beam height to be large. If the angle is too small, it is easy to cause a large distance between the slag receiving station 6 and the waiting station 1, which makes it take a long time for the slag tank car 3 to complete the replacement. Generally, it is optimal to select an angle of 15 degrees between the first slag tank car track and the second slag tank car track.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. 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. It should be noted that similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

Claims

1. A slag pot rapid replacement process system for electric furnace smelting, characterized in that: It includes a group of electric furnaces, two groups of slag tank cars and a herringbone track cross-transport line. Each group of slag tank cars is provided with a slag tank body. The herringbone track cross-transport line includes a first slag tank car track and a second slag tank car track. The first slag tank car track and the second slag tank car track are merged through the herringbone track cross block and then incorporated into a slag receiving station. The slag receiving station is located directly below the furnace door of the electric furnace.

2. The electric furnace smelting rapid replacement slag pot process system according to claim 1 is characterized in that: The wheels of the slag tank car are of single rim type.

3. The electric furnace smelting rapid replacement slag pot process system according to claim 1 is characterized in that: The slag pot car is provided with a supporting seat, and the slag pot body is placed on the supporting seat.

4. The electric furnace smelting rapid replacement slag pot process system according to claim 1 is characterized in that: A counterweight is arranged on the non-slag discharge side of the slag tank car.

5. The electric furnace smelting rapid replacement slag pot process system according to claim 1 is characterized in that: The center line of the bracket is parallel to the track line of the crane used to lift the slag pot body in the workshop.

6. The electric furnace smelting rapid replacement slag pot process system according to claim 1 is characterized in that: The included angle between the first slag tank car track and the second slag tank car track is 15 degrees.

7. The electric furnace smelting rapid replacement slag pot process system according to claim 1 is characterized in that: The herringbone track cross block 5 is provided with a notch at the wheel rim.

8. The electric furnace smelting rapid replacement slag pot process system according to claim 1 is characterized in that: The distance between the slag receiving station and the starting waiting station of the slag tank truck is 20-25 meters.

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