A labyrinth-style scrap steel bale structure and manufacturing method

Abstract

This invention discloses a labyrinth-type scrap steel baler structure and its manufacturing method, relating to the fields of scrap steel balers and scrap steel smelting technology. The labyrinth-type scrap steel baler structure includes a perforated scrap steel baler with through holes. The perforated scrap steel baler contains a closed cavity for filling fuel. The through holes and the closed cavity are connected by a labyrinth structure, which allows molten steel from the through holes to flow into the closed cavity during the steelmaking process. This labyrinth-type scrap steel baler structure and manufacturing method, based on a perforated and closed-cavity scrap steel baler, adds a labyrinth structure between the holes and the closed cavity, which can accelerate and control the time it takes for molten steel to enter the closed cavity, thereby improving the smelting efficiency of the perforated scrap steel baler in scrap steel smelting.

Description

Technical Field

[0001] This invention relates to the field of scrap steel baling and scrap steel smelting technology, specifically to a labyrinth-type scrap steel baling structure and its manufacturing method. Background Technology

[0002] Currently, experts both domestically and internationally have conducted extensive research on the utilization of scrap steel in converters. However, related theoretical research is relatively limited. To improve the scrap steel ratio in the steel production process, Professor Chen Linquan conducted theoretical calculations and analyses of the melting of scrap steel in molten iron and molten steel, and performed on-site verification. The melting process of scrap steel in molten iron typically occurs at temperatures between 1250℃ and 1500℃, while the melting point of scrap steel is above 1500℃. Because the melting point of scrap steel is higher than the temperature of molten iron, based on thermodynamic models and experiments, the melting process of scrap steel in molten iron is considered to be as follows: In the initial stage of melting, the temperature difference between scrap steel and molten iron is large, and molten iron solidifies on the surface of the scrap steel, forming a solidified layer; as time progresses and the temperature of the scrap steel increases, the solidified layer on the surface begins to melt; carbon in the molten iron transfers mass to the surface of the scrap steel, forming a carburized layer; as the temperature of the scrap steel continues to rise, the carbon content on the surface of the scrap steel increases, and the melting point decreases; when the melting point of the carburized layer on the surface of the scrap steel is lower than the temperature of the molten pool, the scrap steel melts and forms a liquid state. Then the surface of the scrap steel undergoes repeated solidification, carburizing, and melting until all the scrap steel has melted. Therefore, the limiting factor in the melting of scrap steel in molten iron is the mass transfer of carbon on the surface of the scrap steel.

[0003] Making scrap steel into baled blocks facilitates storage, transportation, and recycling in furnaces, and results in extremely low losses, making it an effective way to process scrap steel. However, scrap steel baled blocks are large in volume and dense inside, which is not conducive to heat transfer, mass transfer, conduction, convection, and radiation, and also makes it difficult for personnel to observe the internal composition of the scrap steel.

[0004] Currently, there are methods to add fuel to the converter, but when smelting scrap steel, the fuel will float directly to the surface of the molten steel and cannot fully contact the scrap steel to generate heat, thus reducing the smelting efficiency of scrap steel.

[0005] Although existing technologies, such as the invention with application number CN202210398966.X, disclose a metal baler and pressing mold, pressing equipment, and method, which uses a metal baler structure with through holes and a closed cavity to improve the heat transfer effect in the scrap steel smelting process, and adding the fuel required for smelting into the closed cavity can also make the fuel fully contact and generate heat, further improving the smelting efficiency of scrap steel, in actual use, the molten steel needs to melt the closed cavity wall before it can contact and react with the fuel in the closed cavity, thus delaying the time for the fuel to participate in the smelting. When the wall thickness is uncertain, it further increases the uncertainty of the time for the fuel to participate in the smelting, reducing the smelting efficiency of scrap steel. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this invention provides a labyrinthine scrap steel bale structure and manufacturing method, solving the following technical problems:

[0008] 1. In the existing technology, scrap steel baled blocks with enclosed cavities require the molten steel to melt the walls of the enclosed cavity before the fuel inside the enclosed cavity can participate in the smelting process, which is not conducive to improving the smelting efficiency.

[0009] 2. The serrated labyrinth is not easy to press onto hard scrap steel bales;

[0010] 3. Long-pipe labyrinths make it difficult to control the time it takes for molten steel to enter the closed cavity.

[0011] (II) Technical Solution

[0012] To achieve the above objectives, the present invention provides the following technical solution: a labyrinth-type scrap steel baling block structure, comprising a perforated scrap steel baling block, wherein the perforated scrap steel baling block has through holes and a closed cavity for filling fuel is provided inside the perforated scrap steel baling block, the through holes and the closed cavity are connected by a labyrinth structure, the labyrinth structure being used to guide molten steel from the through holes into the closed cavity during the steelmaking process of the perforated scrap steel baling block.

[0013] Preferably, the maze structure is a toothed maze.

[0014] Preferably, the maze structure is a multi-curve maze.

[0015] Preferably, a flow-limiting throttle is provided on the multi-bend maze.

[0016] Preferably, the flow restrictor is a conical flow restrictor or a frustum-shaped flow restrictor.

[0017] Preferably, the multi-bend maze includes multiple interconnected pipes, the length of which in the vertical direction is greater than the length of the closed cavity, and the length of which in the horizontal direction is greater than the diameter of the closed cavity.

[0018] (III) Beneficial Effects

[0019] This invention provides a labyrinthine scrap steel bale structure and its manufacturing method. It offers the following advantages:

[0020] (1) The labyrinth-type scrap steel baling block structure and manufacturing method, based on the scrap steel baling block with holes and closed cavities, adds a labyrinth structure between the holes and the closed cavities, which can speed up and control the time for molten steel to enter the closed cavities, thereby improving the smelting efficiency of the perforated scrap steel baling block in scrap steel smelting.

[0021] (2) The structure and manufacturing method of the maze-type scrap steel baler block adopts a curved maze, which facilitates pressing on the metal baler block with a relatively hard material.

[0022] (3) The structure and manufacturing method of the maze-type scrap steel baler can further improve the control of the time when molten steel enters the closed cavity by adding a flow-limiting section on the basis of the curved maze. Attached Figure Description

[0023] Figure 1 This is a front view of an existing perforated scrap steel bale.

[0024] Figure 2 Cross-sectional view of an existing perforated scrap steel bale;

[0025] Figure 3 This is the lower half of the front view of an existing perforated scrap steel bale.

[0026] Figure 4 This is a lower half top view of an existing perforated scrap steel bale.

[0027] Figure 5 This is a front view of an existing perforated scrap steel baling block mold;

[0028] Figure 6 Top view of an existing perforated scrap steel baling block mold;

[0029] Figure 7 This is a lower half top view of the maze-type scrap steel bale block of the present invention (curved maze);

[0030] Figure 8 This is a lower half top view (toothed maze) of the maze-type scrap steel bale block of the present invention;

[0031] Figure 9 This is a lower half top view of the labyrinthine scrap steel bale block of the present invention (a curved labyrinth with a flow-limiting throttle);

[0032] Figure 10 This is a schematic diagram of a curved maze structure.

[0033] Figure 11 This is a front view of the maze-type scrap steel baling block mold of the present invention (curved maze);

[0034] Figure 12 This is a top view of the maze-type scrap steel baling block mold of the present invention (curved maze);

[0035] Figure 13 This is a front view of the labyrinth-type scrap steel baling block mold of the present invention (a curved labyrinth with a flow-limiting throttle);

[0036] Figure 14 This is a bottom view of the labyrinth-type scrap steel baling block mold of the present invention (a curved labyrinth with a flow-limiting throttle);

[0037] Figure 15 This is a front view of the maze-type scrap steel baling block mold of the present invention (symmetrically arranged toothed maze);

[0038] Figure 16 This is a top view of the labyrinth-type scrap steel baling block mold of the present invention (symmetrically arranged toothed labyrinth);

[0039] Figure 17 This is a cross-sectional view of the labyrinthine scrap steel bale block of the present invention (symmetrically arranged toothed labyrinth);

[0040] Figure 18 This is a front view of the maze-type scrap steel baling block mold of the present invention (a toothed maze arranged on one side);

[0041] Figure 19 This is a top view of the maze-type scrap steel baling block mold of the present invention (a toothed maze arranged on one side);

[0042] Figure 20 This is a cross-sectional view of the labyrinth-type scrap steel bale block of the present invention (a toothed labyrinth arranged on one side);

[0043] Figure 21 This is a schematic diagram of the labyrinth-type scrap steel baler pressing process of the present invention.

[0044] In the diagram: 1. Perforated scrap steel baler; 11. Upper half of perforated scrap steel baler; 111. Mounting groove A; 112. Mounting block A; 12. Lower half of perforated scrap steel baler; 121. Mounting block B; 122. Mounting groove B; 13. Through hole; 131. Semicircular groove; 14. Enclosed cavity A; 141. Enclosed cavity groove A; 15. Enclosed cavity B; 151. Enclosed cavity groove B;

[0045] 2. Mold; 21. Mounting block pressing groove; 22. Mounting groove pressing block; 23. Through hole pressing block; 24. Closed cavity pressing block A; 25. Closed cavity pressing block B; 26. Labyrinth structure pressing module; 27. Flow limiting joint pressing block; 28. Toothed labyrinth pressing block;

[0046] 3. Maze structure; 31a, First horizontal passage; 31b, First vertical passage; 32a, Second horizontal passage; 32b, Second vertical passage; 33a, Third horizontal passage; 33b, Third vertical passage; 34a, Fourth horizontal passage; 34b, Fourth vertical passage;

[0047] 4. Flow restriction throttle. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] The metal bale blocks pressed in the following embodiments and comparative examples all have a cross-sectional dimension of 0.8m*1.2m and a length of 1.2m. They have a through hole 131 and a closed cavity diameter of 10cm. There is one through hole 13 and two closed cavities. The length of the closed cavity is not less than 0.6m. The initial carbon content is 0.1%. The through hole 131 is located at the center of the cross-section of the metal bale block. The closed cavity is located 20cm away from the axis of the through hole 13. The mounting block is a triangular prism, and the mounting groove is a triangular prism groove. The height of the triangular prism is 5cm and the base of the triangular prism is 4cm. The triangular prism and the triangular prism groove are interference fit or transition fit. The coke has a calorific element C content of 85%. The initial temperature of the metal bale block is 25℃. Coke with a mass ratio of 0.59:1000 to the metal bale block is added during the converter smelting process.

[0050] like Figures 1-6 The perforated scrap steel bale 1 in the following embodiments and comparative examples includes an upper half 11 and a lower half 12. A semi-circular groove 131 is provided at the bottom of the upper half 11 and the top of the lower half 12. The semi-circular groove 131 at the bottom of the upper half 11 corresponds to the semi-circular groove 131 at the top of the lower half 12 and can be combined to form a through hole 13. A perforated scrap steel bale 11 is provided at the bottom of the upper half 11 and the top of the lower half 12. The closed cavity groove at the bottom of the perforated scrap steel baler block 11 corresponds to the closed cavity groove at the top of the perforated scrap steel baler block 12 and can be combined to form a closed cavity; the bottom left and right sides of the perforated scrap steel baler block 11 are respectively provided with mounting groove A111 and mounting block A112, and the top left and right sides of the perforated scrap steel baler block 12 are respectively provided with mounting block B121 and mounting groove B122, and mounting groove A111 and mounting block A112 can be connected to mounting block B121 and mounting groove B122 respectively.

[0051] Comparative Example 1: Metal Packing Block with Application No. CN202210398966.X

[0052] Example 1: Metal packing block using a toothed labyrinth

[0053] A labyrinth-type scrap steel baler structure includes a perforated scrap steel baler 1, a perforated scrap steel baler 1 with a through hole 13, and a closed cavity for filling fuel inside the perforated scrap steel baler 1. The through hole 13 and the closed cavity are connected by a labyrinth structure 3, which is used to pass molten steel from the through hole 13 into the closed cavity during the steelmaking process of the perforated scrap steel baler 1.

[0054] in:

[0055] like Figure 8 The labyrinth structure 3 is a toothed labyrinth, which includes a flow channel and multiple flow-blocking strips installed within the flow channel. During the converter smelting process, molten steel first enters the through hole 13 quickly and then slowly passes through the toothed labyrinth into the closed cavity to react with the fuel in the closed cavity.

[0056] The toothed labyrinth can be processed by pressing. The bottom of the pressing mold 2 is provided with a mounting block pressing groove 21, a through hole pressing block 23, a closed cavity pressing block, a mounting groove pressing block 22, and a labyrinth structure pressing module 26. The mounting block pressing groove 21 is used to press the mounting groove A111 and the mounting groove B122. The through hole pressing block 23 is used to press the semi-circular groove 131. The closed cavity pressing block is used to press the closed cavity groove. The labyrinth structure pressing module 26 is used to press the labyrinth structure 3.

[0057] The pressing mold and pressing method in this embodiment are best suited for softer metal packing blocks. This is because the structure of the serrated labyrinth is relatively small compared to the entire metal packing block, and it may not be possible to press a good serrated labyrinth on a hard metal packing block. In addition, the influence of the gaps in the metal packing block itself must also be considered. If the serrated labyrinth occupies a small proportion of the volume of the entire metal packing block, then the gaps in the metal packing block itself will have a greater impact on the serrated labyrinth.

[0058] like Figure 21 The pressing process is as follows:

[0059] The characteristic surfaces of the upper half 11 and the lower half 12 of the perforated scrap steel bale are the bottom surface and the top surface, respectively, and the process includes the following steps:

[0060] Step 1: Use mold 2 to press two scrap steel bales with characteristic surfaces;

[0061] Step 2: Place one of the scrap steel balers on top of the other scrap steel baler;

[0062] Step 3: Flip the upper scrap steel baler vertically. At this point, the upper scrap steel baler is the upper half of the perforated scrap steel baler 11, and the lower scrap steel baler is the lower half of the perforated scrap steel baler 12.

[0063] Step 4: Connect the upper half 11 of the perforated scrap steel baler block and the lower half 12 of the perforated scrap steel baler block through the mounting slot A111, mounting block A112, mounting block B121, and mounting slot B122.

[0064] In this embodiment, the maze structure pressing module 26 can be set on one or both sides of the through hole pressing block 23.

[0065] When set on both sides, such as Figures 15-17 The maze structure 3 was compressed into two pairs that were spliced ​​together.

[0066] When set on one side, such as Figures 18-20 Maze structure 3 was pressed into a pair but not spliced ​​together; instead, it was attached to the flat part of the other half of the packaged block.

[0067] Both the upper half 11 and the lower half 12 of the perforated scrap steel baler are pressed using the mold 2. Since the maze structure does not entirely require splicing and assembly, it is possible to place the maze structure pressing module 26 on one side of the through-hole pressing block 23. The technical purpose of placing it on one side is to simplify the complexity of the mold and reduce its maintenance costs.

[0068] Example 2: Metal packing blocks using a multi-curved maze

[0069] This embodiment is proposed to solve the technical problem that the toothed labyrinth in Embodiment 1 is not easy to press onto a relatively hard metal packing block.

[0070] The difference between this embodiment and Embodiment 1 is that the maze structure 3 is a multi-bend maze. Essentially, the flow channel can have a larger diameter (making it easier to press and reducing the impact of gaps in the metal packing block itself), and the speed at which molten steel enters the closed cavity is slowed down by extending the length of the channel.

[0071] A preferred requirement for a multi-bend maze is that the multi-bend maze includes multiple interconnected pipes, the sum of the vertical lengths of the multiple pipes is greater than the length of the closed cavity, and the sum of the horizontal lengths of the multiple pipes is greater than the diameter of the closed cavity.

[0072] like Figure 10 The sum of the lengths of all horizontal channels (including the first horizontal channel 31a, the second horizontal channel 32a, the third horizontal channel 33a and the fourth horizontal channel 34a) is greater than the diameter of the closed cavity, and the sum of the lengths of all vertical channels (including the first vertical channel 31b, the second vertical channel 32b, the third vertical channel 33b and the fourth vertical channel 34b) is greater than the length of the closed cavity.

[0073] Figure 10This is just one way to set up a multi-curve maze. In order to facilitate the calculation of the length of each pipe in the horizontal and vertical directions, only horizontal channels (with no length in the vertical direction) and vertical channels (with no length in the horizontal direction) are deliberately set. Alternatively, oblique channels (with length in both the horizontal and vertical directions) can be selected. Furthermore, this embodiment is only one arrangement method. Other channel arrangement methods that can achieve the technical purpose of this embodiment should also be within the protection scope of this invention.

[0074] The difference between this embodiment and Embodiment 1 in terms of the manufacturing mold is that the maze structure pressing module 26 is used to press a multi-curved maze. The pressing process is the same as in Embodiment 1.

[0075] Example 3: Adding a metal packing block for the current limiting section 4

[0076] The curved maze in Example 2 delays the entry of molten steel into the closed cavity by extending the flow path of molten steel. However, the length of the pipe maze cannot be extended indefinitely to control the time it takes for molten steel to enter the closed cavity. Therefore, this example is proposed.

[0077] This embodiment, based on embodiment 2, adds a flow-limiting section 4 to the flow channel of the curved labyrinth. The flow-limiting section 4 can be a conical or frustum-shaped section. Upon encountering the high temperature of molten steel, the section melts. As the melting range of the section expands, its flow-limiting effect gradually weakens, thus further improving the control over the time it takes for molten steel to flow into the closed cavity. In practical use, those skilled in the art can select the number and type of flow-limiting sections as needed. A conical section can be considered a flow-limiting section with a closed inlet, while a frustum-shaped section can be considered a flow-limiting section with a small inlet and a large outlet. With a conical section, molten steel needs to melt at the closed inlet to create a through-hole before entering. With a frustum-shaped section, molten steel can enter directly, and the flow rate of molten steel increases with the degree of melting of the section structure.

[0078] The difference between this embodiment and Embodiment 2 in terms of the manufacturing mold is that a flow-limiting pressing block 27 is provided on the labyrinth structure pressing module 26. The pressing process is the same as in Embodiment 1.

[0079] The table below shows the smelting results of the metal bales from Comparative Examples 1-3 and Examples 1-2 (the values ​​in the table are the average melting times of four identical bales).

[0080] Example Metal packing block melting time Comparative Example 1 240s Example 1 220s Example 2 220s Example 3 230s

[0081] In Examples 1-3, the molten steel was able to enter the closed cavity earlier than in Comparative Example 1 and react with the fuel inside the closed cavity, thus Examples 1-3 all had higher melting rates.

[0082] Although the labyrinth structure used in Example 2 is longer than that in Example 1, the flow area of ​​the labyrinth structure in Example 2 is larger. Therefore, overall, the melting speeds of Example 1 and Example 2 are basically the same. However, since the labyrinth structure of Example 2 is easier to manufacture (press), Example 2 is a better example.

[0083] The difference between Example 3 and Example 2 is that a flow-limiting section is added. Although the flow-limiting section delays the time for molten steel to enter the closed cavity, the setting of the flow-limiting section provides the possibility for more precise control of the time for molten steel to enter the closed cavity.

[0084] It should be noted that in the description of the invention, the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the description of the structure of the invention shown in the accompanying drawings. They are only for the convenience of describing the invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0085] The terms "first" and "second" in this technical solution are merely designations for corresponding structures that are identical or similar, or that perform similar functions. They do not represent an arrangement of the importance of these structures, nor do they imply any ranking, comparison of size, or other meaning.

[0086] Furthermore, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, a connection 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 an indirect connection through an intermediate medium; it can be a connection within two structures. Those skilled in the art can understand the specific meaning of the above terms in this invention by considering the overall concept of the invention and the specific context of the solution.

Claims

1. A structure of a labyrinth of scrap packing blocks, comprising a perforated scrap packing block (1) provided with through holes (13) and a closed cavity inside for filling with fuel, characterized in that: The through hole (13) is connected to the closed cavity through a labyrinth structure (3), which is used to pass molten steel in the through hole (13) into the closed cavity during the steelmaking process of the perforated scrap steel baled block (1).

2. The labyrinthine scrap steel baling block structure according to claim 1, characterized in that: The maze structure (3) is a toothed maze.

3. The labyrinthine scrap steel baler structure according to claim 1, characterized in that: The maze structure (3) is a multi-curve maze.

4. The labyrinthine scrap steel baler structure according to claim 3, characterized in that: The multi-bend maze is equipped with a flow-limiting section (4).

5. The labyrinthine scrap steel baling block structure according to claim 4, characterized in that: The flow-limiting section (4) is one of a conical flow-limiting section or a frustum-shaped flow-limiting section.

6. The labyrinthine scrap steel baler structure according to claim 3, characterized in that: The multi-bend maze includes multiple interconnected pipes, the length of which in the vertical direction is greater than the length of the closed cavity, and the length of which in the horizontal direction is greater than the diameter of the closed cavity.

7. A labyrinthine scrap steel baling block structure according to any one of claims 1 to 6, characterized in that: The perforated scrap steel baler (1) includes an upper half (11) and a lower half (12). The bottom of the upper half (11) of the perforated scrap steel baler and the top of the lower half (12) of the perforated scrap steel baler are both provided with semi-circular grooves (131). The semi-circular grooves (131) at the bottom of the upper half (11) of the perforated scrap steel baler and the semi-circular grooves (131) at the top of the lower half (12) of the perforated scrap steel baler are positioned corresponding to each other and can be combined to form a through hole (13). The bottom of the upper half (11) of the perforated scrap steel baling block and the top of the lower half (12) of the perforated scrap steel baling block are both provided with closed cavity grooves. The closed cavity groove at the bottom of the upper half (11) of the perforated scrap steel baling block and the closed cavity groove at the top of the lower half (12) of the perforated scrap steel baling block are positioned corresponding to each other and can be combined to form a closed cavity. The bottom left and right sides of the perforated scrap steel baling block (11) are provided with mounting groove A (111) and mounting block A (112), respectively. The top left and right sides of the perforated scrap steel baling block (12) are provided with mounting block B (121) and mounting groove B (122), respectively. The mounting groove A (111) and mounting block A (112) can be connected to the mounting block B (121) and mounting groove B (122), respectively.

8. A manufacturing mold for a labyrinth-type scrap steel baler structure as described in claim 7, characterized in that: The bottom of the mold (2) is provided with a mounting block pressing groove (21), a through hole pressing block (23), a closed cavity pressing block, a mounting groove pressing block (22), and a maze structure pressing module (26). The mounting block pressing groove (21) is used to press the mounting groove A (111) and the mounting groove B (122). The through-hole pressing block (23) is used to press the semi-circular groove (131). The closed cavity pressing block is used to press the closed cavity groove; The maze structure suppression module (26) is used to suppress the maze structure (3).

9. The manufacturing mold for a labyrinth-type scrap steel baler structure according to claim 8, characterized in that: The labyrinth structure suppression module (26) is provided with a current limiting block (27) for suppressing the current limiting block (4).

10. A method for manufacturing a labyrinthine scrap steel bale structure, characterized in that: The manufacturing mold for a labyrinth-type scrap steel baler structure as described in claim 8, wherein the characteristic surfaces of the upper half (11) and the lower half (12) of the perforated scrap steel baler are the bottom surface and the top surface, respectively, and the manufacturing method includes the following steps: Step 1: Use mold (2) to press two scrap steel balers with characteristic surfaces; Step 2: Place one of the scrap steel balers on top of the other scrap steel baler; Step 3: Flip the scrap steel baler located at the top vertically. At this time, the scrap steel baler located at the top is the upper half of the perforated scrap steel baler (11), and the scrap steel baler located at the bottom is the lower half of the perforated scrap steel baler (12). Step 4: Connect the upper half (11) of the perforated scrap steel baler block and the lower half (12) of the perforated scrap steel baler block through mounting slot A (111), mounting block A (112), mounting block B (121), and mounting slot B (122).

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