Furnace charge preheating device of submerged arc furnace

Abstract

The utility model discloses a furnace charge preheating device of a submerged arc furnace, which belongs to the technical field of preheating of furnace charge of a submerged arc furnace and is characterized in that a feeding pipe for feeding is arranged at the upper end of an L-shaped pipe, a bin at the upper end of the L-shaped pipe is a stirring bin, a driving motor is arranged on the inclined surface of the L-shaped pipe, and the output end of the driving motor is connected with a stirring rod extending into the stirring bin; a plurality of material distributing rollers are arranged at the corner of the L-shaped pipe, material distributing gaps are formed among the material distributing rollers, and an opening in the lower end of the L-shaped pipe is a discharging opening. The hot air blowing system generates high-temperature hot air, and the high-temperature hot air exchanges heat with the ore through the L-shaped pipe to achieve rapid and uniform preheating. The stirring system drives a stirring rod to rotate, turn over and mix ore through a motor, accumulation and caking are prevented, and full contact with hot air is ensured. The distribution rollers and the multi-stage gaps are arranged to ensure that the ore is dispersed from hot to cold in sequence, and uniform preheating is achieved. The preheating device improves the production efficiency of the submerged arc furnace, reduces the energy consumption, improves the product quality and prolongs the service life of equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of hot stove burden preheating, in particular to a burden preheating device for a submerged arc furnace. Background Technique

[0002] The raw materials required for submerged arc furnace smelting mainly include iron ore, coal, scrap steel, etc., and these raw materials are called furnace burden in the submerged arc furnace. In practical applications, the preheating process of the submerged arc furnace burden often relies on a hot air blowing system. Although the hot air blowing system can achieve the preheating of materials to a certain extent, its effect has significant limitations.

[0003] Firstly, from the perspective of efficiency, the hot air blowing system blows air to the material pile and transfers heat through the convection of hot air. However, due to the uneven density, shape and distribution of the material pile, as well as the limited circulation of hot air inside the material pile, heat cannot be transferred quickly and evenly to every part of the furnace burden. Therefore, the entire preheating process takes a long time, which has an adverse effect on the production efficiency of the submerged arc furnace.

[0004] Secondly, uneven preheating is another important problem faced by the hot air blowing system. Due to the complexity of the internal structure of the material pile, the circulation of hot air in the material pile is often uneven, which leads to different preheating degrees of different parts of the furnace burden. Some parts of the furnace burden may be fully preheated, while other parts may be under-preheated. This uneven preheating state not only affects the overall quality of the furnace burden, but also may have a negative impact on the normal operation of the submerged arc furnace. For example, the under-preheated furnace burden needs a longer time to reach the required temperature after entering the submerged arc furnace, which not only increases energy consumption, but also may affect the quality and output of the product. Content of the Utility Model

[0005] The main purpose of the utility model is to provide a burden preheating device for a submerged arc furnace, which can effectively solve the problems put forward in the background technique.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A burden preheating device for a submerged arc furnace includes a trapezoidal pipe, a connecting pipe, a blowing device, a high-temperature resistant frame and heating wires. The connecting pipe and the high-temperature resistant frame are respectively located at both ends of the trapezoidal pipe. A blowing device is arranged at the outer end of the connecting pipe. The heating wires are installed inside the high-temperature resistant frame, and an L-shaped pipe is arranged at the outer end of the high-temperature resistant frame. The blowing device blows the heat at the heating wires into the L-shaped pipe and preheats the ore in the L-shaped pipe.

[0008] The upper end of the L-shaped pipe is provided with a feed pipe for feeding materials. The upper end bin of the L-shaped pipe is a stirring bin. A driving motor is provided on the inclined surface of the L-shaped pipe, and the output end of the driving motor is connected with a stirring rod extending into the stirring bin. A plurality of material distribution rollers are provided at the corner of the L-shaped pipe, and a material distribution gap is formed between the plurality of material distribution rollers. The lower end opening of the L-shaped pipe is a discharge port.

[0009] As a further preferred embodiment of the present invention, the trapezoidal pipe is installed on the connecting pipe and the high-temperature resistant frame through bolts. The high-temperature resistant frame and the L-shaped pipe are fixed to each other through connecting flanges, bolts and nuts. A heat-resistant rubber strip is provided at the connection between the high-temperature resistant frame and the L-shaped pipe;

[0010] As a further preferred embodiment of the present invention, the cross-section of the feed pipe is designed to be elliptical, and the feed pipe is inserted into the middle of the stirring bin. The feed pipe is fixedly welded to the L-shaped pipe;

[0011] As a further preferred embodiment of the present invention, the driving motor is fixed on the L-shaped pipe through bolts, nuts and anti-slip gaskets. The output end of the driving motor passes through the opening on the inclined surface of the L-shaped pipe. The driving motor and the stirring rod are fixed through bolts and nuts, and the rod body of the stirring rod is sleeved with stirring blades;

[0012] As a further preferred embodiment of the present invention, a filter screen is provided between the high-temperature resistant frame and the L-shaped pipe, and the filter screen blocks the materials in the stirring bin from entering the heating wire;

[0013] As a further preferred embodiment of the present invention, the material distribution rollers are installed on the L-shaped pipe through a rotating shaft and a bearing device, and the gap size of the material distribution gap gradually decreases from near the heating wire to far from the heating wire.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] In the present invention, the preheating device for the charge of the submerged arc furnace skillfully combines a hot air blowing system, a stirring system and a material distribution structure to realize uniform preheating of the charge. First of all, the hot air blowing system generates a hot air flow through a blowing device and heats it into high-temperature hot air by means of a heating wire. These hot air quickly and evenly enter the L-shaped pipe and conduct sufficient heat exchange with the ore material, thus realizing rapid and uniform preheating of the charge.

[0016] At the same time, the stirring system drives the stirring rod to rotate in the stirring bin through the driving motor. The stirring blades on the stirring rod effectively turn over and mix the ore material, avoiding the phenomena of accumulation and caking during the preheating process. This stirring method ensures sufficient contact between the ore material and the hot air, further improving the preheating effect.

[0017] The design of the material distributing roller and the setting of multiple material distributing gaps enable the ore to be gradually dispersed in the order from hot to cold during the preheating process. The materials close to the heating wire are preheated first, and then through the rotation and hierarchical dispersion of the material distributing roller, the entire ore can obtain a uniform heat distribution during the preheating process.

[0018] Through the mutual cooperation of these three systems, the ore preheating device of the submerged arc furnace not only improves the production efficiency of the submerged arc furnace, but also ensures that the furnace charge has reached an appropriate temperature before entering the submerged arc furnace. This helps to reduce energy consumption, improve product quality, and extend the service life of the equipment. Brief Description of the Drawings

[0019] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0020] Figure 2 is a side view of the overall structure of the present utility model;

[0021] Figure 3 is an exploded view of the blowing system and the L-shaped pipe of the present utility model;

[0022] Figure 4 is a sectional view of the L-shaped pipe and the material distributing pipe of the present utility model.

[0023] In the figure: 1, trapezoidal pipe; 2, connecting pipe; 3, blowing device; 4, high-temperature resistant frame; 5, heating wire; 6, L-shaped pipe; 7, feed pipe; 8, stirring bin; 9, drive motor; 10, stirring rod; 11, material distributing roller; 12, material distributing gap; 13, discharge port. Detailed Description of the Preferred Embodiment

[0024] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with the specific embodiments.

[0025] As Figures 1 to 4 shown, we present a carefully designed ore preheating device for a submerged arc furnace. The device consists of several key parts, including a trapezoidal pipe 1, a connecting pipe 2, a blowing device 3, a high-temperature resistant frame 4, a heating wire 5, and an L-shaped pipe 6. The connecting pipe 2 is located at one end of the trapezoidal pipe 1, while the high-temperature resistant frame 4 is located at the other end. At the outer end of the connecting pipe 2, the blowing device 3 is ingeniously installed to drive the flow of hot air. At the same time, the heating wire 5 is properly installed inside the high-temperature resistant frame 4 to ensure that heat can be evenly dissipated.

[0026] To further optimize the preheating effect, we added an L-shaped pipe 6 at the outer end of the high-temperature resistant frame 4. The heat blown by the blowing device 3, after being heated by the heating wire 5, will directly enter the L-shaped pipe 6 to preheat the ore placed therein. The design of the L-shaped pipe 6 fully considers the fluidity and preheating efficiency of the materials.

[0027] At the upper end of the L-shaped pipe 6, we have set up a feed pipe 7 for adding the ore to be preheated into the device. The cross-section of the feed pipe 7 is designed as an ellipse to increase the fluidity of the material and ensure that the material can smoothly enter the stirring bin 8. The stirring bin 8 is located at the upper end of the L-shaped pipe 6 and is used to stir the ore during the preheating process to ensure uniform preheating.

[0028] To drive the stirring rod 10 to stir in the stirring bin 8, we have installed a driving motor 9 on the inclined plane of the L-shaped pipe 6. The output end of the driving motor 9 is firmly fixed to the L-shaped pipe 6 through bolts, nuts and anti-slip gaskets, and passes through the opening on its inclined plane to be tightly connected to the stirring rod 10. Stirring blades are sleeved on the rod body of the stirring rod 10 to enhance the stirring effect.

[0029] To ensure the efficient utilization of heat during the preheating process, we have set up a filter screen between the high-temperature resistant frame 4 and the L-shaped pipe 6. This filter screen can effectively prevent the material in the stirring bin 8 from entering the heating wire 5, thus avoiding damage to the heating wire 5 and ensuring the preheating effect.

[0030] In addition, we have installed multiple material distribution rollers 11 at the corner of the L-shaped pipe 6. These material distribution rollers 11 are fixed to the L-shaped pipe 6 through rotating shafts and bearing devices, and material distribution gaps 12 are opened between them. The design of these material distribution gaps 12 is very ingenious, and the gap sizes decrease successively from near the heating wire 5 to far from the heating wire 5 to ensure that the ore can be evenly dispersed and preheated during the preheating process. Due to the setting of the material distribution rollers 11, the discharge of material debris can be achieved after the material distribution gaps 12 are opened between multiple material distribution rollers 11.

[0031] Finally, the entire device is fixed and connected through bolts and connecting flanges. The trapezoidal pipe 1 is installed on the connecting pipe 2 and the high-temperature resistant frame 4 through bolts, while the high-temperature resistant frame 4 and the L-shaped pipe 6 are fixedly connected through connecting flanges, bolts and nuts. To ensure the sealing and heat resistance of the connection, we have set up heat-resistant rubber strips at the connection between the high-temperature resistant frame 4 and the L-shaped pipe 6.

[0032] The entire preheating device for the charge of the submerged arc furnace is reasonably designed, compact in structure and easy to operate, and can efficiently preheat the ore, improving the production efficiency and product quality of the submerged arc furnace.

[0033] Working process: The blowing device 3 is started to blow air to form a hot air flow. The hot air flow enters the trapezoidal pipe 1 through the connecting pipe 2 and flows towards the high-temperature resistant frame 4. Inside the high-temperature resistant frame 4, the heating wire 5 starts to work to heat the passing hot air flow to form high-temperature hot air. The high-temperature hot air then enters the L-shaped pipe 6 to preheat the ore placed therein. The design of the L-shaped pipe 6 ensures that the hot air can fully contact the ore to achieve uniform preheating.

[0034] When the material enters the mixing bin 8 through the feed pipe 7, the drive motor 9 starts. The drive motor 9 drives the stirring rod 10 to rotate in the mixing bin 8, and the stirring blades on the stirring rod 10 enable the material to be evenly stirred during the preheating process. At the corner of the L-shaped tube 6, multiple dividing rollers 11 begin to rotate. The dividing gap 12 opened between the dividing rollers 11 is designed to decrease in size from close to the heating wire 5 to far away from the heating wire 5, so that the material is evenly dispersed during the preheating process. The material close to the heating wire 5 is preheated first, and is gradually dispersed to the area far away from the heating wire 5 through the rotation of the dividing rollers 11, so as to achieve uniform preheating of the material.

[0035] During the preheating process, the debris or impurities that may be generated by the material will be discharged through the material separation gap 12 between the material separation rollers 11, ensuring the preheating effect while keeping the device clean. The entire device is fixed and sealed by bolts, connecting flanges and heat-resistant rubber strips to ensure that the hot air will not leak during the preheating process while maintaining the stability of the device. The hot air blowing system, stirring system and material separation structure in the preheating device of the submerged arc furnace cooperate with each other to achieve uniform preheating of the material, providing a strong guarantee for the efficient production and product quality of the submerged arc furnace.

[0036] The ore-fired furnace charge preheating device proposed in the utility model ingeniously integrates the hot blowing system, the stirring system and the material distribution structure, aiming to achieve uniform and efficient preheating of the charge. Firstly, the built-in blowing device of the hot blowing system cooperates with the heating wire to generate and heat high-temperature hot air, which quickly passes through the L-shaped tube and fully exchanges heat with the charge, ensuring rapid and uniform preheating of the charge.

[0037] At the same time, the stirring system plays a vital role. It uses a drive motor to drive the stirring rod to rotate in the stirring chamber, and the stirring blades on the stirring rod effectively turn and mix the charge, effectively avoiding the accumulation and agglomeration problems that may occur during the preheating process. This stirring method ensures full contact between the charge and the hot air, thereby further improving the preheating effect.

[0038] In addition, the design of the distribution rollers and the setting of multi-level distribution gaps add a new dimension to the preheating process of the charge. During the preheating process, the charge is gradually dispersed in the order from hot to cold. The charge close to the heating wire is preheated first, and then as the distribution rollers rotate and disperse in stages, the entire charge can obtain uniform heat distribution during the preheating process.

[0039] In summary, through the coordinated operation of these three systems, the burden preheating device of the submerged arc furnace not only significantly improves the production efficiency of the submerged arc furnace, but also ensures that the burden reaches the ideal preheating temperature before entering the submerged arc furnace. This not only helps to reduce energy consumption, improve product quality, but also effectively extends the service life of the equipment.

[0040] The above is the preferred embodiment of the present invention and the technical principles applied therein. For those skilled in the art, any obvious changes such as equivalent transformation and simple substitution based on the technical solution of the present invention without departing from the spirit and scope of the present invention shall fall within the protection scope of the present invention.

Claims

1. A charge preheating device for a submerged arc furnace, characterized in that: The invention comprises a trapezoidal tube (1), a connecting tube (2), a blowing device (3), a high temperature resistant frame (4) and a heating wire (5), wherein the connecting tube (2) and the high temperature resistant frame (4) are respectively located at two ends of the trapezoidal tube (1), the outer end of the connecting tube (2) is provided with a blowing device (3), the heating wire (5) is installed in the frame of the high temperature resistant frame (4), and the outer end of the high temperature resistant frame (4) is provided with an L-shaped tube (6), the blowing device (3) blows the heat at the heating wire (5) into the L-shaped tube (6) and preheats the ore in the L-shaped tube (6); A feeding pipe (7) for feeding materials is provided at the upper end of the L-shaped tube (6); the upper end bin of the L-shaped tube (6) is a stirring bin (8); a driving motor (9) is provided on the inclined surface of the L-shaped tube (6); and the output end of the driving motor (9) is connected to a stirring rod (10) extending into the stirring bin (8); a plurality of material distribution rollers (11) are provided at the corners of the L-shaped tube (6); material distribution gaps (12) are provided between the plurality of material distribution rollers (11); and the lower end opening of the L-shaped tube (6) is a material discharge port (13).

2. The charge preheating device for a submerged arc furnace according to claim 1, characterized in that: The trapezoidal tube (1) is mounted on the connecting tube (2) and the high temperature resistant frame (4) by means of bolts; the high temperature resistant frame (4) and the L-shaped tube (6) are fixed to each other by means of connecting flanges, bolts and nuts; a heat resistant rubber strip is provided at the connection between the high temperature resistant frame (4) and the L-shaped tube (6).

3. The charge preheating device for a submerged arc furnace according to claim 2, characterized in that: The cross section of the feed pipe (7) is designed to be elliptical, and the feed pipe (7) is inserted into the middle of the stirring chamber (8), and the feed pipe (7) is fixed to the L-shaped pipe (6) by welding.

4. The charge preheating device for a submerged arc furnace according to claim 3, characterized in that: The drive motor (9) is fixed to the L-shaped tube (6) by means of bolts, nuts and anti-slip gaskets; the output end of the drive motor (9) passes through the inclined opening of the L-shaped tube (6); the drive motor (9) and the stirring rod (10) are fixed by means of bolts and nuts; and the shaft of the stirring rod (10) is provided with stirring blades.

5. The charge preheating device for a submerged arc furnace according to claim 4, characterized in that: A filter screen is provided between the high temperature resistant frame (4) and the L-shaped tube (6), and the filter screen blocks the material in the stirring chamber (8) from entering the heating wire (5).

6. The charge preheating device for a submerged arc furnace according to claim 5, characterized in that: The material dividing roller (11) is mounted on the L-shaped tube (6) via a rotating shaft and a bearing device, and the size of the material dividing gap (12) decreases from close to the heating wire (5) to far away from the heating wire (5).

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