Cage casting device for hydrogen-based shaft furnace cage casting test

Abstract

The utility model relates to a cage casting device for a hydrogen-based shaft furnace cage casting test, and belongs to the technical field of metallurgical engineering in the metallurgical industry. According to the technical scheme, the ball comprises a spherical segment (1), air holes (2), a spherical crown (3), a sealing plate (5) and a feeding hole (6), the spherical crown (3) and the spherical segment (1) are combined together to form a hollow ball body, the air holes (2) are evenly formed in the spherical surface of the spherical segment (1), the sealing plate (5) integrated with the spherical segment (1) is arranged at a notch of the spherical segment (1), the feeding hole (6) is formed in the center of the sealing plate (5), and the spherical segment (1) and the feeding hole (6) are communicated. The spherical crown (3) and the spherical segment (1) are connected together through a bolt to form the cage casting device for the cage casting test; and a plurality of bolt holes (4) matched with bolts are respectively formed in the periphery of the central feeding hole (6) of the sealing plate (5) and the spherical crown (3). The utility model has the beneficial effects that the maximum DRI yield can be ensured, and the recycling of the cage casting device is realized.

Description

Technical Field

[0001] The utility model relates to a cage throwing device for a hydrogen-based vertical furnace cage throwing test, belonging to the technical field of metallurgical engineering in the metallurgical industry. Background Art

[0002] The traditional steel industry urgently needs to implement effective carbon reduction measures, and developing new processes to lower carbon emissions is particularly crucial. Against this backdrop, hydrogen shaft furnace technology has emerged as a promising technology. Compared to a conventional "blast furnace + converter" process of similar scale, a hydrogen shaft furnace using hydrogen-rich gas as the reducing gas can achieve over 70% CO2 reductions. Even more exciting, using pure hydrogen as the reducing gas results in virtually zero carbon emissions per ton of iron produced. Furthermore, hydrogen shaft furnaces offer another significant advantage: the direct reduced iron (DRI) they produce has low impurity content, making it ideal for producing high-value-added steel grades. This not only helps reduce the pressure of subsequent steelmaking, but also significantly enhances the core competitiveness of steelmakers by producing "green steel" using DRI as a raw material. Therefore, hydrogen shaft furnace technology not only contributes to environmental protection and emission reduction, but also offers significant economic benefits and market advantages for steelmakers.

[0003] The pellet cage experiment can explore the effects of parameters such as pellet composition and particle size composition on hydrogen reduction during the actual production process, helping us gain a deeper understanding of the changes in the physical and chemical properties of direct reduced iron. Through this experiment, we can observe the performance of different pellets under different conditions, such as the effects of temperature, pressure, and time on pellet strength, wear resistance, and reducibility. In addition, the cage experiment can also help evaluate the applicability of raw materials and the rationality of the production process, thereby providing strong data support for improving the pellet production process. In general, conducting a pellet cage experiment is a key step in improving pellet production quality, optimizing process flow, and ensuring stable and smooth blast furnace smelting.

[0004] The iron ore vertical furnace cage test involves loading test iron ore into a specially designed metal mesh cage. This cage is then added to the vertical furnace through the top charging port along with the production iron ore. Under the high-temperature heating and reduction effects of the vertical furnace, both the test iron ore and the production iron ore are reduced simultaneously. However, due to the high pellet content in the hydrogen-based vertical furnace, direct friction between the wire mesh and the pellets is severe, and the extremely high temperatures ultimately damage the metal bag, resulting in extremely low DRI recovery rates in the cage test. Furthermore, the metal mesh is very difficult to manufacture. Utility Model Content

[0005] The purpose of the utility model is to provide a cage throwing device for hydrogen-based vertical furnace cage throwing test, which can ensure the maximum DRI yield and realize the recycling and reuse of the cage throwing device, thereby solving the problems existing in the background technology.

[0006] The technical solution of the utility model is:

[0007] A cage throwing device for a hydrogen-based vertical furnace cage throwing test comprises a spherical segment, air holes, a spherical cap, a sealing plate and a feed hole. The spherical cap and the spherical segment are combined to form a hollow sphere. The air holes are evenly arranged on the spherical surface of the spherical segment. A sealing plate that is an integral structure with the spherical segment is provided at the notch of the spherical segment. The feed hole is provided at the center of the sealing plate. The spherical cap and the spherical segment are connected together by bolts to form the cage throwing device for the cage throwing test.

[0008] A plurality of bolt holes matching with the bolts are respectively arranged around the central feed hole of the sealing plate and on the spherical crown.

[0009] The diameter of the air holes on the spherical surface of the spherical segment is smaller than the diameter of the pellet.

[0010] The diameter of the central feed hole of the sealing plate is larger than the diameter of the pellets.

[0011] The beneficial effects of the utility model are:

[0012] (1) It is wear-resistant, pressure-resistant and high-temperature-resistant, so it can be reused, reducing the capital cost of cage casting;

[0013] (2) The cage device has strong pressure resistance, eliminating the squeezing effect of the traditional cage on the pellets, and greatly improving the DRI yield;

[0014] (3) The air holes evenly distributed on the surface of the spherical segment can not only prevent the leakage of the experimental pellets, but also enable the oxidized pellets and the reducing gas to fully contact;

[0015] (4) It can accurately detect the DRI product data of different pellets in hydrogen-based vertical furnaces and provide accurate data support for actual production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the spherical segment structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the spherical crown structure of the utility model;

[0019] Figure 4 This is a schematic diagram of a hydrogen-based vertical furnace;

[0020] In the figure: ball segment 1, vent hole 2, ball crown 3, bolt hole 4, sealing plate 5, feed hole 6;

[0021] Top gas outlet 10, cooling gas inlet 11, cooling gas outlet 12, direct reduced iron outlet 13, discharge pipe 14, process gas inlet 15, reduction section 16, cooling section 17. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and examples.

[0023] Refer to the attached Figure 1-3 A cage throwing device for a hydrogen-based vertical furnace cage throwing test comprises a spherical segment 1, an air vent 2, a spherical crown 3, a sealing plate 5 and a feed hole 6. The spherical crown 3 and the spherical segment 1 are combined to form a hollow sphere. The air vent 2 is evenly arranged on the spherical surface of the spherical segment 1. A sealing plate 5 that is an integral structure with the spherical segment 1 is provided at the notch of the spherical segment 1. A feed hole 6 is provided at the center of the sealing plate 5. The spherical crown 3 and the spherical segment 1 are connected together by bolts to form a cage throwing device for the cage throwing test.

[0024] In this embodiment, refer to the attached Figure 1-3 The cage throwing device for the hydrogen-based vertical furnace cage throwing test includes a spherical segment 1, an air vent 2, a spherical crown 3, a bolt hole 4, a sealing plate 5, and a feed hole 6. The specific manufacturing process is as follows:

[0025] (1) Select a square steel material with a side length of 250 to 300 mm, which is resistant to high temperature and high pressure without deformation;

[0026] (2) Making a hollow sphere by casting;

[0027] (3) Eliminate a part of the hollow sphere to form a spherical cap 3 and a spherical part 1;

[0028] (4) Using a punching method, holes are evenly punched on the spherical surface of the spherical segment 1, with a hole size of 10 to 12 mm, as vent holes 2;

[0029] (5) Use a steel plate with a thickness of 3 to 5 mm as a sealing plate 5 and weld it to the notch of the spherical segment 1. Punch a hole in the center of the sealing plate 5 with a diameter greater than 12 mm as the feed hole 6.

[0030] (6) Drill bolt holes 4 around the center hole of the sealing plate 5 and at the corresponding positions of the spherical crown 3;

[0031] (7) Connect the ball crown 3 and the ball segment 1 together by bolts.

[0032] Refer to the attached Figure 4 The hydrogen-based vertical furnace includes an upper reduction section 16 and a lower cooling section 17. A process gas inlet 15 is provided at the lower part of the reduction section 16, a furnace top gas outlet 10 is provided at the upper part of the reduction section 16, a cooling gas inlet 11 is provided at the lower part of the cooling section 17, and a direct reduced iron outlet 13 is provided at the bottom of the cooling section 7. The hydrogen-based vertical furnace discharge pipes 8 are symmetrically distributed, and the lower part of each discharge pipe 8 is connected to the top of the hydrogen-based vertical furnace 1. The alternating distribution ensures that the cage device is evenly distributed when entering the hydrogen-based vertical furnace.

[0033] The cage throwing experiment process is as follows:

[0034] (1) Adding oxidized pellets into the spherical cavity 1 through the feed port 6, wherein the oxidized pellets are iron-containing fine powder oxidized pellets, the total iron grade is above 65%, the proportion of solid particles with a particle size of 12mm-16mm in the oxidized pellets is not less than 95%, and the strength of the oxidized pellets is ≥2254N;

[0035] (2) The ball cap 3 and the ball segment 1 are connected together by bolts to form a feeding device;

[0036] (3) The cage throwing device is put into the hydrogen-based vertical furnace through the feeding pipe 8 on the top of the hydrogen-based vertical furnace;

[0037] (2) High-temperature reducing gas is introduced into the hydrogen-based vertical furnace. The oxidized pellets are in contact with the high-temperature reducing gas in the reduction section in a countercurrent flow and exchange heat. After being heated to the set reduction temperature, they react with the reducing gas.

[0038] (4) The reduced product enters the cooling section through the high-temperature cage device. After cooling, it is discharged from the bottom of the cooling section through the direct reduced iron outlet.

Claims

1. A cage throwing device for hydrogen-based vertical furnace cage throwing test, characterized by: The invention comprises a spherical segment (1), an air vent (2), a spherical cap (3), a sealing plate (5) and a feeding hole (6). The spherical cap (3) and the spherical segment (1) are combined to form a hollow sphere. The air vent (2) is evenly arranged on the spherical surface of the spherical segment (1). A sealing plate (5) which is an integral structure with the spherical segment (1) is provided at the gap of the spherical segment (1). The feeding hole (6) is provided at the center of the sealing plate (5). The spherical cap (3) and the spherical segment (1) are connected together by bolts to form a cage throwing device for a cage throwing test.

2. The cage throwing device for hydrogen-based vertical furnace cage throwing test according to claim 1, characterized in that: A plurality of bolt holes (4) matching with the bolts are respectively provided around the central feed hole (6) of the sealing plate (5) and on the spherical crown (3).

3. The cage throwing device for hydrogen-based vertical furnace cage throwing test according to claim 1, characterized in that: The diameter of the air pores (2) on the spherical surface of the spherical segment (1) is smaller than the diameter of the pellet.

4. The cage throwing device for hydrogen-based vertical furnace cage throwing test according to claim 1, characterized in that: The diameter of the central feed hole (6) of the sealing plate (5) is larger than the diameter of the pellets.

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