Waste steel preheating and feeding device for refining furnace
By setting up horizontal tubes and heating mechanisms in the scrap steel preheating device of the refining furnace, three-dimensional heating and uniform heat distribution of the scrap steel are achieved, solving the problem of insufficient preheating in the middle and bottom parts, and improving the preheating effect and heat utilization rate.
Patent Information
- Application Number
- CN202422822182.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-11-19
AI Technical Summary
In the existing scrap steel preheating device of the refining furnace, the high-temperature flue gas can only pass through the outer layer of the scrap steel, resulting in insufficient preheating of the middle and bottom parts, low heat utilization rate, and poor preheating effect.
A device including a conveyor box and a conveyor belt was designed. Heating mechanisms were installed on both sides of the conveyor belt. Horizontal pipes were located at the bottom and inside of the scrap steel. High-temperature flue gas was ejected from the jet holes to heat the scrap steel in three dimensions. The scrap steel was supported by the horizontal pipes to avoid excessive stacking and ensure even heat distribution.
It achieves uniform preheating of all parts of the scrap steel, improves the heat utilization rate of the flue gas and the preheating effect, and ensures that the scrap steel meets the preheating requirements.
Smart Images
Figure CN223345924U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of scrap steel preheating, in particular to a scrap steel preheating and charging device for a refining furnace. Background Art
[0002] A refining furnace is a type of smelting equipment in the hot working industry, primarily used for the final deoxidation and alloying of molten steel in ferrous metallurgy. It is categorized according to the purpose of the smelting process, with common examples including argon-blown refining furnaces and LF refining furnaces. Scrap steel refers to steel waste, such as trimmings and ends, that do not become finished products during the steel mill production process, as well as steel materials from discarded equipment and components. Scrap steel is steel, while scrap steel is pig iron. Collectively, these are referred to as scrap steel. When recycling steel, the scrap steel needs to be heated and melted in a refining furnace. Preheating the scrap steel before placing it in the refining furnace shortens the scrap steel smelting cycle, thereby saving energy.
[0003] The scrap preheating and charging device for a refining furnace is a device used to implement continuous preheating and charging of scrap steel. In the prior art, this device mostly uses an automatic charging method, allowing scrap steel pieces of different specifications to be piled together and fed into the refining furnace via a conveyor belt to achieve uninterrupted production and improve production efficiency. However, there are still the following problems: Currently, high-temperature flue gas is mostly used to preheat the scrap steel. However, due to the piled scrap steel, the high-temperature flue gas often only passes through the upper layer of the scrap steel, and the scrap steel in the middle and bottom parts cannot be fully preheated. The heat utilization rate of the high-temperature flue gas is low, resulting in the scrap steel being hot at the top and cold at the bottom. The overall preheating temperature is generally low, which does not meet the technical requirements for scrap preheating and the preheating effect is poor. Therefore, it is objectively necessary to develop a scrap preheating and charging device for a refining furnace that can preheat uniformly, has high flue gas heat utilization rate, and has good preheating effect. Utility Model Content
[0004] The utility model aims to provide a scrap steel preheating charging device for a refining furnace which can preheat evenly, has high flue gas heat utilization rate and good preheating effect.
[0005] The purpose of the utility model is achieved in this way, including a conveying box and a conveyor belt arranged in the conveying box, two heating mechanisms are symmetrically arranged on both sides of the conveyor belt, each heating mechanism includes a number of hollow sealed cavities arranged at intervals along the length direction of the conveyor belt, a skirt-type rib is provided on the conveyor belt between each two adjacent hollow sealed cavities, each two adjacent hollow sealed cavities are connected by a flexible telescopic tube, a transverse tube is provided between the corresponding hollow sealed cavities on the two heating mechanisms, a number of air injection holes are evenly provided on the tube wall of the lower half of the transverse tube, a feed port is provided on the top of the conveying box above the feed end of the conveyor belt, a discharge port is provided on the bottom of the conveying box below the discharge end of the conveyor belt, a flexible hose is provided on the outside of one of the hollow sealed cavities, and the end of the flexible hose is connected to the conveying box.
[0006] Furthermore, a rotating sealing structure is formed between the flexible hose and the side wall of the delivery box.
[0007] Furthermore, an air box is provided on the outer wall of the delivery box, and the air inlet end of the flexible hose is connected to the air box.
[0008] Furthermore, a plurality of through holes are provided on the inner side of the hollow sealed cavity.
[0009] Furthermore, the transverse tubes are arranged in multiple rows up and down, and the transverse tubes in two adjacent rows are staggered.
[0010] Furthermore, a baffle is provided on the top of the conveying box above the feeding end of the conveyor belt.
[0011] When the utility model is in operation, the flexible hose is connected to the high-temperature flue gas conveying pipeline, and the high-temperature flue gas enters the hollow sealed cavity connected to it through the flexible hose, and then enters the adjacent hollow sealed cavity through the flexible telescopic tube, and enters the hollow sealed cavity of another heating mechanism through the horizontal pipe. The high-temperature flue gas is ejected from the jet holes on the horizontal pipe, filling the entire conveying box for preheating, and then the conveyor belt is started, and the scrap steel is put into the conveying box from the feed port and falls on the conveyor belt. The conveyor belt drives the scrap steel forward. During the movement, the high-temperature flue gas heats it to achieve the purpose of preheating. The utility model is provided with a horizontal pipe, which has two functions. One is that when the scrap steel falls onto the conveyor belt, the horizontal pipe at this position is located at the bottom and inside of the scrap steel, and the high-temperature flue gas is ejected from the jet holes of the horizontal pipe, that is, the high-temperature flue gas is sprayed into the bottom and inside of the scrap steel pile, and the scrap steel is heated from the bottom and inside, while the high-temperature flue gas ejected from the horizontal pipe not covered by the scrap steel can heat the outer layer of the scrap steel. The two methods are combined to heat the outer layer, bottom and inside of the scrap steel at the same time, ensuring that the outer layer, middle and bottom of the scrap steel can be fully heated, solving the current problem that the scrap steel is piled up together and the high-temperature flue gas can only heat the outer layer of the scrap steel, thereby heating the middle and bottom The problem of scrap steel not being fully preheated is solved, so that all parts of the scrap steel can be better heated, the preheating is more uniform, the preheating temperature of each part is averaged, and the preheating effect is improved; secondly, the horizontal tube has a supporting effect on the scrap steel, and because the scrap steel is usually irregular in shape, the setting of the horizontal tube can leave more gaps between the scrap steel and the scrap steel, avoiding the scrap steel from being piled too tightly, and the high-temperature flue gas can flow more smoothly in the scrap steel pile, preventing the blockage of the high-temperature flue gas, thereby improving the heat exchange efficiency between the scrap steel and the high-temperature flue gas, improving the utilization rate of the heat in the high-temperature flue gas, and improving the preheating temperature of the overall scrap steel, with a better preheating effect, so that the scrap steel meets the preheating requirements. In summary, the utility model has the advantages of uniform preheating, high flue gas heat utilization rate, and good preheating effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic diagram of the main structure of the utility model;
[0013] Figure 2 This is a schematic diagram of the top view of the structure of the utility model;
[0014] Figure 3 This is a left-side structural schematic diagram of the present utility model;
[0015] In the figure: 1- conveying box, 2- conveyor belt, 3- hollow sealing chamber, 4- skirt-type rib, 5- flexible telescopic tube, 6- horizontal tube, 7- air injection hole, 8- feed port, 9- discharge port, 10- flexible hose, 11- air box, 12- through hole, 13- baffle plate. DETAILED DESCRIPTION
[0016] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or improvements based on the present invention fall within the scope of protection of the present invention.
[0017] like Figures 1 to 3 As shown, the utility model includes a conveying box 1 and a conveyor belt 2 arranged in the conveying box 1. The conveying box 1 is a closed box body used for conveying and preheating scrap steel. The conveyor belt 2 is an existing conveying equipment used for conveying scrap steel. The scrap steel is preheated during conveying. Two heating mechanisms are symmetrically arranged on both sides of the conveyor belt 2. Each heating mechanism includes a plurality of hollow sealed cavities 3 arranged at intervals along the length direction of the conveyor belt 2. A skirt-type rib 4 is provided on the conveyor belt 2 between each two adjacent hollow sealed cavities 3. Each two adjacent hollow sealed cavities 3 are connected by a flexible telescopic tube 5. A transverse tube 6 is provided between the corresponding hollow sealed cavities 3 on the two heating mechanisms. A plurality of air injection holes 7 are evenly provided on the tube wall of the lower half of the transverse tube 6. A feed port 8 is provided on the top of the conveying box 1 above the feeding end of the conveyor belt 2, and a discharge port 9 is provided on the bottom of the conveying box 1 below the discharging end of the conveyor belt 2. A flexible hose 10 is provided on the outside of one of the hollow sealed cavities 3, and the end of the flexible hose 10 is connected to the conveying box 1. In the present invention, in order to extend the service life, the skirt-type rib 4, the flexible telescopic tube 5 and the flexible hose 10 are all made of high-temperature resistant materials.
[0018] When the utility model is in operation, the flexible hose 10 is connected to the high-temperature flue gas conveying pipeline, and the high-temperature flue gas enters the hollow sealed cavity 3 connected to it through the flexible hose 10, and then enters the adjacent hollow sealed cavity 3 through the flexible telescopic tube 5, and enters the hollow sealed cavity 3 of another heating mechanism through the transverse pipe 6. The high-temperature flue gas is ejected from the jet holes 7 on the transverse pipe 6, filling the entire conveying box 1 for preheating, and then the conveyor belt 2 is started, and the scrap steel is put into the conveying box 1 from the feed port 8 and falls on the conveyor belt 2. The conveyor belt 2 drives the scrap steel to move forward. During the movement, the high-temperature flue gas heats it to achieve the purpose of preheating. The flue gas with a lowered temperature can be discharged from the exhaust port set at the top of the conveying box 1. The scrap steel after preheating is discharged into the refining furnace from the discharge port 9. The utility model is provided with a transverse pipe 6, which has two functions. One is that when the scrap steel falls onto the conveyor belt 2, the transverse pipe 6 at this position is located at the bottom and inside of the scrap steel, and the high-temperature flue gas is ejected from the jet holes 7 of the transverse pipe 6, that is, the high-temperature flue gas is sprayed into the bottom and inside of the scrap steel pile, and the scrap steel is heated from the bottom and inside, while the high-temperature flue gas ejected from the transverse pipe 6 not covered by the scrap steel can heat the outer layer of the scrap steel. The two methods are combined to heat the outer layer, bottom and inside of the scrap steel at the same time, ensuring that the outer layer, middle and bottom of the scrap steel can be fully heated, solving the current problem that the scrap steel is piled together and the high-temperature flue gas can only heat the outer layer of the scrap steel, thereby heating the middle and bottom of the scrap steel. The problem of insufficient preheating of the scrap steel at the bottom is solved, so that all parts of the scrap steel can be better heated, the preheating is more uniform, the preheating temperature of each part is averaged, and the preheating effect is improved; secondly, the cross pipe 6 has a supporting effect on the scrap steel, and because the scrap steel is usually irregular in shape, the setting of the cross pipe 6 can leave more gaps between the scrap steel and the scrap steel to avoid the scrap steel from being piled too tightly. The high-temperature flue gas can flow more smoothly in the scrap steel pile to prevent the blockage of the high-temperature flue gas, thereby improving the heat exchange efficiency between the scrap steel and the high-temperature flue gas, improving the utilization rate of the heat in the high-temperature flue gas, and improving the preheating temperature of the overall scrap steel, with a better preheating effect, so that the scrap steel meets the preheating requirements.
[0019] There is a rotating sealing structure between the flexible hose 10 and the side wall of the conveying box 1. The flexible hose 10 is arranged on the hollow sealing cavity 3, and the hollow sealing cavity 3 is in a moving state driven by the conveyor belt 2, and the moving trajectory is annular. During the continuous operation of the device, the flexible hose 10 will be twisted or even damaged. For this reason, the connection structure between the flexible hose 10 and the side wall of the conveying box 1 is set to a rotating sealing structure. The flexible hose 10 can release torque by rotation to prevent damage. At the same time, the sealing structure can prevent the leakage of high-temperature flue gas in the conveying box 1 and avoid heat waste.
[0020] An air box 11 is provided on the outer wall of the conveying box 1, and the air inlet end of the flexible hose 10 is connected to the air box 11. The high-temperature flue gas first enters the air box 11, then enters the flexible hose 10, and finally enters the hollow sealed cavity 3 and the cross pipe 6 to preheat the scrap steel.
[0021] A plurality of through holes 12 are provided on the inner side of the hollow sealed cavity 3. The hollow sealed cavity 3 is filled with high-temperature flue gas. The high-temperature flue gas can be ejected from the through holes 12 to heat the scrap steel pile from both sides. Together with the high-temperature flue gas ejected from the jet holes 7 of the transverse pipe 6, the scrap steel pile is heated in three dimensions, thereby further improving the preheating effect of the scrap steel pile.
[0022] The horizontal tubes 6 are arranged in multiple rows, one above the other, with adjacent rows staggered. These rows, arranged from bottom to top, allow the high-temperature flue gas to be ejected both uniformly horizontally and vertically into various locations within the scrap pile, improving the uniformity and effectiveness of the scrap preheating process.
[0023] A baffle plate 13 is provided on the top of the conveying box 1 above the feed end of the conveyor belt 2. When actually set, the baffle plate 13 is set on one side of the feed port 8 and is located in front of the conveying direction of the conveyor belt 2. Its function is: when scrap steel falls onto the conveyor belt 2, the stacking height is usually high. After the baffle plate 13 is set, the scrap steel that is higher than the lower end surface of the baffle plate 13 cannot pass through, limiting the stacking height of the scrap steel and averaging the stacking height of the scrap steel to ensure the consistency of the stacking height of the scrap steel, which can prevent the preheating effect from being affected by the scrap steel stacking being too high, and ensure the stability of the scrap steel preheating.
Claims
1. A scrap steel preheating and charging device for a refining furnace, comprising a conveying box (1) and a conveyor belt (2) arranged in the conveying box (1), characterized in that Two heating mechanisms are symmetrically arranged on both sides of the conveyor belt (2), each heating mechanism includes a plurality of hollow sealed cavities (3) arranged at intervals along the length direction of the conveyor belt (2), a skirt-type rib (4) is arranged on the conveyor belt (2) between each two adjacent hollow sealed cavities (3), each two adjacent hollow sealed cavities (3) are connected through a flexible telescopic tube (5), a transverse tube (6) is arranged between the corresponding hollow sealed cavities (3) on the two heating mechanisms, and a plurality of air injection holes (7) are evenly arranged on the tube wall of the lower half of the transverse tube (6), a feed port (8) is arranged on the top of the conveying box (1) above the feed end of the conveyor belt (2), a discharge port (9) is arranged on the bottom of the conveying box (1) below the discharge end of the conveyor belt (2), a flexible hose (10) is arranged on the outside of one of the hollow sealed cavities (3), and the end of the flexible hose (10) is connected to the conveying box (1).
2. The scrap steel preheating charging device for a refining furnace according to claim 1, characterized in that A rotating sealing structure is formed between the flexible hose (10) and the side wall of the delivery box (1).
3. The scrap steel preheating charging device for a refining furnace according to claim 2, characterized in that An air box (11) is provided on the outer wall of the delivery box (1), and the air inlet end of the flexible hose (10) is connected to the air box (11).
4. The scrap steel preheating and charging device for a refining furnace according to claim 1, characterized in that A plurality of through holes (12) are provided on the inner side of the hollow sealed cavity (3).
5. The scrap steel preheating and charging device for a refining furnace according to claim 1, characterized in that The transverse tubes (6) are arranged in multiple rows up and down, and two adjacent rows of transverse tubes (6) are arranged in a staggered manner.
6. The scrap steel preheating and charging device for a refining furnace according to claim 1, characterized in that A baffle plate (13) is provided on the top of the conveying box (1) above the feeding end of the conveying belt (2).