Device for reducing danger of over-wet zone at middle lower part of sintered material layer

Abstract

The utility model provides a device for reducing the danger of an over-wet zone at the middle lower part of a sintering material layer, which comprises a preheating structure arranged in a trolley at the head part of a sintering machine, and the preheating structure is arranged above a first air bellow below the trolley at the head part of the sintering machine and is positioned at the middle-layer position of a material distribution area in the trolley at the head part of the sintering machine; the preheating structure comprises a plurality of spraying pipes arranged in the width direction of the sintering machine head trolley and inclined plates arranged on the nozzle end sides of the spraying pipes and sequentially connected with the spraying pipes, and the inclined plates incline upwards by a certain angle in the spraying direction of the spraying pipes, so that a local small cavity is formed in the lower portion of the inclined plates. The vertical sintering device is simple and reliable in structure, can obviously reduce the hazard of an over-wet zone, improves the air permeability of a sintered material layer, improves the vertical sintering speed and the production efficiency, and reduces the energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of iron and steel metallurgy technology, specifically to a device for reducing the danger of excessive moisture in the lower part of the sintering material layer. Background Technology

[0002] Sintering is currently the most widely used method for granulating iron-containing raw materials in steel enterprises both domestically and internationally. The sintering process can be summarized as follows: A sintering mixture (containing iron-containing raw materials, fuel, solvent, and return ore, etc.) is mixed with an appropriate amount of water, granulated, and then spread onto the sintering machine trolley. After ignition on the surface of the sintering material, the fuel in the material layer burns from top to bottom and releases heat under the forced draft of the lower air box. The mixture undergoes a series of physical and chemical changes under high temperature, ultimately solidifying into sintered ore. Sintered ore, as a raw material for ironmaking, is combined with pellets, lump ore, coke, and other materials in a certain proportion and then smelted in a blast furnace.

[0003] However, the sintering process exhibits significant stratification, which can be divided into five zones based on temperature changes and physicochemical reactions: the sinter zone, combustion zone, preheating zone, drying zone, and over-wet zone. While the appearance of these five zones during sintering is a natural phenomenon, the over-wet zone affects the permeability of the sintering bed, damaging the formed mixture pellets, especially in the lower part of the sintering bed. This leads to a decrease in sintering vertical speed and production efficiency, and an increase in energy consumption. Therefore, we propose a device to reduce the dangers of the over-wet zone in the lower part of the sintering bed, addressing the aforementioned problems in existing technologies. Utility Model Content

[0004] The purpose of this invention is to provide a device for reducing the danger of excessive moisture in the lower part of the sintering material layer, so as to solve some technical problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a device for reducing the danger of excessive moisture in the lower part of the sintering material layer, comprising a preheating structure installed inside the head carriage of the sintering machine, the preheating structure being located above the first air box under the head carriage of the sintering machine and in the middle layer of the material distribution area inside the head carriage of the sintering machine.

[0006] The preheating structure includes multiple nozzles arranged along the width of the head carriage of the sintering machine, and an inclined plate located at the nozzle end of the nozzle and connected to each nozzle in sequence. The inclined plate is set at a certain angle upward toward the spray direction of the nozzle, so that its lower part forms a local small cavity.

[0007] Furthermore, the preheating structure is connected to the high-temperature section of the chimney of the external cooler via a hot air pipe. A regulating valve is installed on the pipe body near the cooler. The end of the hot air pipe away from the cooler extends through into the head carriage of the sintering machine and is connected to each nozzle.

[0008] Furthermore, the inclined plate is set at an upward tilt angle of 15°.

[0009] Furthermore, there is a certain distance between the two sides of the preheating structure and the side rails of the sintering machine head trolley.

[0010] Furthermore, the inclined plate is disposed on the upper edge of the nozzle;

[0011] Alternatively, the inclined plate may be disposed on the nozzle end of the nozzle, in which case the inclined plate has a through opening corresponding to the nozzle end of the nozzle, which is connected to the nozzle.

[0012] Furthermore, an insulation layer is provided on the outside of the hot air duct.

[0013] Compared with existing technologies, the above technical solution has the following advantages: simple and reliable structure, significantly reduces the harmfulness of excessively wet zones, improves the permeability of the sintering material layer, increases vertical sintering speed and production efficiency, and reduces energy consumption. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a partial structural schematic diagram of the present invention.

[0017] Explanation of reference numerals in the attached drawings: 1. Sintering machine head trolley; 11. Air box; 12. Side rail plate; 2. Preheating structure; 21. Nozzle; 22. Inclined plate; 221. Local small cavity; 222. Exit; 3. Hot air pipe; 31. Regulating valve; 4. External cooler. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0019] To address the problems existing in the prior art, this utility model provides a device for reducing the danger of the excessively wet zone in the lower part of the sintering material layer. It is applied in the production process of iron and steel metallurgy and aims to effectively reduce the hazards of the excessively wet zone in the lower part of the sintering material layer, thereby improving sintering production efficiency and quality. The present utility model will be described in detail below with reference to the accompanying drawings.

[0020] See Figures 1-2 As shown, the technical solution adopted in this specific embodiment is: a device for reducing the danger of excessive moisture in the lower part of the sintering material layer, including a preheating structure 2 installed in the head carriage 1 of the sintering machine. Specifically, the preheating structure 2 is installed above the first air box 11 under the head carriage of the sintering machine, and the preheating structure 2 is located in the middle layer of the material distribution area in the head carriage 1 of the sintering machine.

[0021] It should be specifically noted that the preheating structure 2 includes multiple nozzles 21 arranged along the width direction of the sintering machine head carriage 1. This ensures that hot air is evenly distributed across the width of the sintering material layer, achieving comprehensive preheating of the lower part of the entire sintering material layer. An inclined plate 22 is provided at the nozzle end of each nozzle 21, connecting the nozzles 21 sequentially. The inclined plate 22 is tilted upwards at a certain angle towards the spray direction of the nozzle 21, forming a small local cavity 221 at its lower part. Preferably, the inclined plate 22 is tilted upwards at a 15° angle. The inclined plate 22 can be located on the upper edge of the nozzle 21 or on the nozzle end of the nozzle 21, in which case the inclined plate 22 has a through-hole 222 connected to the nozzle 21 at the nozzle end position. This unique structural design facilitates the flow of hot air, allowing the hot air to fill the cavity and achieve full coverage and uniform preheating of the sintering material, effectively improving the preheating effect.

[0022] It should be specifically noted that the preheating structure 2 is connected to the high-temperature section of the chimney of the external cooler 4 via a hot air duct 3, allowing the preheating gas for the sintering material to come from the hot exhaust gas discharged from the high-temperature section of the cooler, with the temperature of the hot exhaust gas being around 350℃. A regulating valve 31 is installed on the pipe body of the hot air duct 3 near the external cooler 4, which controls the flow rate of the hot exhaust gas to adapt to preheating requirements under different production conditions. The end of the hot air duct 3 furthest from the external cooler 4 extends through into the sintering machine head carriage 1 and connects to each nozzle 21. The natural pressure difference created by the blower air from the external cooler 4 and the exhaust air from the sintering machine head carriage 1 enables the transport of the hot exhaust gas without external power and achieves self-balancing of the flow rate. The pipe diameter of the hot air duct 3 is set to 500mm, and an insulation layer (not shown in the figure) is installed on its exterior to reduce heat loss and ensure the temperature stability of the hot exhaust gas during transport.

[0023] It should be specifically noted that there is a certain distance between the two sides of the preheating structure 2 and the side rails 12 of the sintering machine head carriage 1. This is because of the segregation of the material. The air permeability on both sides of the sintering machine head carriage 1 is better than that in the middle, and the degree of damage from the excessively wet belt is less than that in the middle. Therefore, the focus is on preheating the sintering material in the middle.

[0024] Taking a 360㎡ sintering machine as an example, the trolley width is 5m, the side rail plate 12 of the trolley is 0.9m high, the trolley length is 1.5m, the preheating structure 2 is set about 400mm away from the bottom surface of the trolley (grate bar), and the edge of the preheating structure 2 is about 500mm away from the side rail plate 12. This installation position setting can effectively preheat the lower part of the sintering material layer where excessive moisture is likely to occur.

[0025] During the sintering process, hot exhaust gas from the high-temperature section of the external cooler 4 is transported through hot air duct 3 to the nozzle 21 of the preheating structure 2. The nozzle 21 sprays out the hot exhaust gas, which can uniformly preheat the lower part of the sintering material layer. The structure of the preheating structure 2 itself also has a loosening function for the sintering material, which can improve the air permeability of the lower material layer. The high-temperature hot exhaust gas continues to preheat the lower part of the sintering material layer, which can raise the temperature of the lower sintering material to above the dew point, thus avoiding the formation of an overly wet zone as much as possible. At the same time, the hot exhaust gas helps to remove a small portion of the moisture from the lower sintering material, which also prevents the lower sintering material from damaging the spheres due to excessive moisture to a certain extent. In summary, this utility model has a simple and reliable structure, which can significantly reduce the harmfulness of the overly wet zone, improve the air permeability of the sintering material layer, increase the vertical sintering speed and production efficiency, reduce energy consumption, and can also be extended to similar production practices of solid material sintering.

[0026] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, 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, and therefore should not be construed as a limitation of this utility model.

[0027] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A device for reducing the danger of excessive moisture in the lower part of a sintering bed, characterized in that, Includes a preheating structure (2) installed inside the head carriage (1) of the sintering machine, the preheating structure (2) being located above the first air box (11) under the head carriage (1) of the sintering machine and in the middle layer of the material distribution area inside the head carriage (1) of the sintering machine. The preheating structure (2) includes multiple nozzles (21) arranged along the width direction of the head carriage (1) of the sintering machine, and an inclined plate (22) located on the nozzle end side of the nozzle (21) and connected to each nozzle (21) in sequence. The inclined plate (22) is set at a certain angle upward towards the spray direction of the nozzle (21) so that a local small cavity (221) is formed at its lower part.

2. The device for reducing the danger of excessive moisture in the lower part of the sintering bed according to claim 1, characterized in that, The preheating structure (2) is connected to the high-temperature section of the chimney of the external cooler (4) through the hot air pipe (3). The hot air pipe (3) is equipped with a regulating valve (31) on the pipe body near the cooler. The end of the hot air pipe (3) away from the cooler extends through into the head carriage (1) of the sintering machine and is connected to each nozzle (21).

3. The device for reducing the danger of excessive moisture in the lower part of the sintering bed according to claim 1, characterized in that, The inclined plate (22) is set at an upward angle of 15°.

4. The device for reducing the danger of excessive moisture in the lower part of the sintering bed according to claim 1, characterized in that, The two sides of the preheating structure (2) are at a certain distance from the side rails (12) of the head carriage (1) of the sintering machine.

5. The device for reducing the danger of excessive moisture in the lower part of the sintering bed according to claim 1, characterized in that, The inclined plate (22) is disposed on the upper edge of the nozzle (21); Alternatively, the inclined plate (22) may be disposed on the nozzle end of the nozzle (21), and the inclined plate (22) may be provided with a through opening (222) that is connected to the nozzle (21) at the nozzle end position of the nozzle (21).

6. The device for reducing the danger of excessive moisture in the lower part of the sintering bed according to claim 2, characterized in that, An insulation layer is provided on the outside of the hot air duct (3).

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