Device for improving air permeability of sintered material layer

Abstract

A device for improving air permeability of a sinter bed relates to the field of ferrous metallurgy. The punching device comprises a punching support, a moving trolley and a punching assembly through a control center, the punching support is arranged above a trolley, the moving trolley is arranged on the punching support, an electric push rod is further arranged on the moving trolley, and the punching assembly is located at the bottom of the punching support and connected with a push rod at the bottom of the electric push rod. The punching devices are arranged above the trolley at intervals, the punching speed and the returning speed are controlled through the PLC control system, a series of uniform holes are formed in the material face of the sintering trolley, an ore forming belt hindering ventilation on the upper portion of a material layer of the sintering trolley is broken, the overall resistance of the ore forming belt is reduced, the vertical sintering speed and production efficiency are improved, and energy consumption is reduced. The method is beneficial to reducing the FeO content in the finished sinter, improving the reducing performance of the finished sinter, improving the quality and creating good raw material conditions for further increasing the yield and saving coke in blast furnace ironmaking.

Description

Technical Field

[0001] This utility model relates to a device for improving the air permeability of sintering material layers, and relates to the field of iron and steel metallurgy. 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, flux, 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] The sintering process exhibits distinct stratification. Based on temperature changes and the different physicochemical reactions that occur, the sintering material layer is divided into five zones from top to bottom: the sintered ore zone, the combustion zone, the preheating and drying zone, the water vapor condensation zone, and the original sintered material zone. The airflow through the sintered material layer results in varying resistance losses per unit height in each zone. The structure of the sintered raw material layer itself can influence permeability through enhanced granulation, improved raw material particle size distribution, controlled moisture content, preheating of the mixture, and the incorporation of larger particles into the sintered material. The influence of the gravity of the sintered cake in the sintered ore zone must be addressed through external means, such as installing appropriate support components on the sintering machine trolley to reduce the impact of the sintered cake's weight on the permeability of the sintered raw material layer.

[0004] Since the sintered ore-forming zone has been solidified into blocks, and its thickness gradually increases as the sintering process continues, the resistance to airflow also increases accordingly. Therefore, reducing the resistance of the sintered ore-forming zone itself and improving the permeability of the material layer are of great significance for improving the vertical sintering speed and production efficiency. Utility Model Content

[0005] The purpose of this invention is to address the deficiencies or shortcomings of existing technologies by providing a device to improve the permeability of the sintering material layer. This is achieved by installing spaced-apart perforating devices above the sintering trolley and controlling the perforation and retraction speeds via a PLC control system. This creates a series of uniform holes on the material surface of the sintering trolley, breaking up the ore-forming zone that hinders air permeability in the upper part of the sintering trolley material layer. This reduces the overall resistance of the sintering ore-forming zone, increases the amount and velocity of air passing through it, and to a certain extent improves vertical sintering speed and production efficiency while reducing energy consumption. Simultaneously, it enhances the oxidizing atmosphere during the sintering process, which helps reduce the FeO content in the finished sinter, improves its reducing properties, and enhances its quality, creating favorable raw material conditions for further increasing production and saving coke in blast furnace ironmaking.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: it includes a drilling device, which is controlled by a central drilling device. The drilling device includes a drilling bracket 1, a moving trolley 2, and a drilling assembly 3. The drilling bracket is located above the trolley 5, the moving trolley 2 is located on the drilling bracket 1, and an electric push rod 4 is also provided on the moving trolley 2. The drilling assembly 3 is located at the bottom of the drilling bracket 1 and is connected to the push rod at the bottom of the electric push rod 4.

[0007] Furthermore, an igniter is installed 30m away from the trolley 5 in the opposite direction of the drilling device's travel.

[0008] Furthermore, the aforementioned drilling device is provided in two sets, both sets having the same structure and being spaced 1m apart.

[0009] Furthermore, the drilling assembly 3 includes five nail teeth 31, each nail tooth 31 is spaced 900mm apart, and the stroke of the nail teeth 31 is 500mm.

[0010] Furthermore, the surface of the perforated bracket 1 is provided with double-layer heat-insulating asbestos 11, and the bottom of the perforated bracket 1 is provided with a heat-reflecting panel 12.

[0011] Furthermore, the drilling bracket 1 is equipped with a track that matches the mobile trolley 2, and a position detection proximity switch 6 and a limit stop 7 are installed at a distance of 30m from the igniter.

[0012] Furthermore, the cross-section of the nail tooth 31 is an equilateral triangle with an inner arc groove in the middle, with a side length of 40mm, forming a triangular pyramid structure.

[0013] Furthermore, the mobile trolley 2 is equipped with a drive motor and rollers. The drive motor is controlled by a frequency converter, and the electric push rod 4 is also controlled by a frequency converter.

[0014] The working principle of this utility model is as follows: The sintering trolley and the drilling device are controlled by a PLC control system, which adopts a Siemens PLC s7-1500 system. A control cabinet is also provided on-site, with automatic, manual, and stop control buttons. The control system sets the trolley's running speed and the drilling device's movement and drilling speed according to production needs. During normal operation, pressing the automatic button starts the drilling operation. The drilling device is positioned 30m from the igniter. At this time, the position detection proximity switch 6 detects the drilling device and sends a signal back to the PLC system. The PLC program detects the current start / stop status of the trolley 5, the trolley 5 speed, and gas ignition signals, determining that the trolley 5 is in normal production, and the drilling device starts working. Based on the sintering trolley 5 speed signal, the rated speed of the moving trolley 2 motor, the reduction ratio, and other parameters, the PLC automatically calculates the frequency converter output of the moving trolley 2, adjusting the moving speed of the moving trolley 2. Simultaneously, the electric push rod 4 starts and pushes the drilling assembly 3 downward to drill holes at the same speed as the trolley 5. The drilling depth is set to 300mm. The two drilling devices drill a total of 10 holes side by side. After drilling is completed, the electric push rod 2 retracts, driving the nail tooth 31 to retract synchronously. The nail tooth 31 retracts 500mm to avoid interference and affect the travel of the moving trolley 2. After the nail tooth 31 retracts to the correct position, the moving trolley 2 moves in the opposite direction of the travel of the trolley 5. The retraction speed is twice the speed of the trolley 5. When it returns to the initial position, that is, 30m away from the igniter, the position detection proximity switch 6 detects the signal again and sends a stop signal to the control system to wait for the start of the next operating cycle. The operating cycle of the device is the time required for the trolley 5 to travel a fixed distance. By drilling at even intervals, a series of uniform holes are formed on the sintering trolley material surface, breaking the ore-forming zone that hinders air permeability in the upper part of the sintering trolley material layer, thereby increasing the air permeability of the trolley material layer. Attached Figure Description

[0015] 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.

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

[0017] Figure 2 yes Figure 1 View from point A to point B;

[0018] Figure 3 This is a schematic diagram of the structure of the nail tooth 31 in this utility model;

[0019] Figure 4 yes Figure 3 Cross-sectional view along the CC direction;

[0020] Figure 5 This is a diagram showing the location of the sintering material in this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Drilling bracket; 2. Moving trolley; 3. Drilling assembly; 4. Electric push rod; 5. Trolley; 6. Position detection proximity switch; 7. Limit stop; 11. Double-layer heat-insulating asbestos; 12. Heat-reflecting panel; 31. Nail teeth. Detailed Implementation

[0022] See Figures 1-5 As shown, the technical solution adopted in this specific embodiment is: a device for improving the air permeability of the sintering material layer, which includes a drilling device. The drilling device, controlled by a control center, includes a drilling bracket 1, a moving trolley 2, and a drilling assembly 3. The drilling bracket is positioned above the trolley 5, and the moving trolley 2 is positioned on the drilling bracket 1. An electric push rod 4 is also mounted on the moving trolley 2. The drilling assembly 3 is located at the bottom of the drilling bracket 1 and connected to the push rod at the bottom of the electric push rod 4. In this embodiment, a 360m² sintering machine (trolley width 5m, effective sintering length 80m, trolley sideboard height 900mm) is used. Taking a trolley with a length of 1500mm, a travel speed of 0-2m / min, and a normal production travel speed of approximately 1.5m / min as an example, an igniter is installed 30m away from the trolley in the opposite direction of the drilling device's travel. An igniter and a feeding device are installed above the trolley for material feeding and sintering operations. The drilling device is positioned 30m from the igniter, at approximately 1 / 3 of the effective sintering length, where the sintered ore zone is approximately 300mm thick. Two sets of drilling devices are provided, with identical structures and synchronized operation, spaced 1m apart. (See [reference]). Figure 2 As shown in the diagram, position A in this embodiment represents the drilling device closest to the igniter, located 30m away. After the equipment is started, the trolley begins to run, while the moving trolley moves on the drilling support. Both the trolley and the moving trolley are controlled uniformly through a Siemens PLCs7-1500 system. The electric push rod drives the drilling assembly to drill holes in the sintering zone, with a drilling depth of 300mm, penetrating the sintering zone and the combustion zone. This creates a series of uniform holes on the material surface of the sintering trolley, reducing the overall resistance of the sintering zone and increasing the air volume and flow rate through it. This can improve the vertical sintering speed and production efficiency to a certain extent, while reducing energy consumption. At the same time, it enhances the oxidizing atmosphere during the sintering process, which helps to reduce the FeO content in the finished sinter, improve the reducing properties of the finished sinter, and enhance its quality, creating favorable raw material conditions for further production increases and coke savings in blast furnace ironmaking.

[0023] More specifically, the drilling component 3 includes five nail teeth 31, each nail tooth 31 is spaced 900mm apart, and the stroke of the nail tooth 31 is 500mm. The cross-section of the nail tooth 31 is an equilateral triangle with an inner arc groove in the middle, with a side length of 40mm, forming a triangular pyramid structure. In this embodiment, by setting the grooved triangular pyramid nail teeth as the drilling mechanism, the surface breaking effect can be increased and the extrusion forming of a new material surface solidification layer can be reduced. Setting the drilling stroke of the nail teeth to 500mm can ensure that the nail teeth completely withdraw from the sintering zone after drilling and move away from the sintering zone. In order to prevent the uneven material layer from hindering the movement of the trolley during non-drilling periods, and also to prevent the trolley from being out of sync with the speed of the trolley during the initial operation of the device, causing irregular drilling, the first set of drilling devices is equipped with five nail teeth. The two sets can drill ten holes at the same time to ensure the air permeability of the material layer.

[0024] More specifically, the surface of the perforated bracket 1 is provided with double-layer heat-insulating asbestos 11, and the bottom of the perforated bracket 1 is provided with a heat-reflecting panel 12. Since the perforated bracket is located above the trolley and close to the igniter, the amount of heat radiation is large. The surface is provided with heat-insulating asbestos for heat insulation, and the bottom is provided with a heat-reflecting panel 1 to effectively protect the bracket. In another embodiment, the surface of the mobile trolley is also provided with double-layer heat-insulating asbestos for heat insulation protection, which extends the service life of the equipment.

[0025] More specifically, the drilling bracket 1 is equipped with a track that matches the mobile trolley 2, and a position detection proximity switch 6 and a limit stop 7 are installed 30m away from the igniter. The position detection proximity switch is used to detect the drilling assembly, specifically to detect the position of the mobile trolley. The mobile trolley has a sensor corresponding to the nail tooth position. When the sensor reaches the detection position, it triggers the switch. The position detection proximity switch feeds the detection signal back to the PLC control system, which issues the operation command and uses the limit stop to limit the movement of the mobile trolley to prevent it from moving out of range.

[0026] More specifically, the mobile trolley 2 is equipped with a drive motor and rollers. The drive motor is controlled by a frequency converter, and the electric push rod 4 is also controlled by a frequency converter. In this embodiment, the drive motor and electric push rod of the mobile trolley are controlled by frequency converter through a PLC control system to ensure the accuracy of the stroke.

[0027] The beneficial effects of this utility model after adopting the above technical solution are as follows: By setting a perforated device at intervals above the sintering trolley and controlling the perforation speed and retraction speed through a PLC control system, a series of uniform holes are formed on the material surface of the sintering trolley, breaking the ore-forming zone that hinders air permeability in the upper part of the sintering trolley material layer, reducing the overall resistance of the sintering ore-forming zone, and increasing the amount and velocity of air passing through the sintering ore-forming zone. This can improve the vertical sintering speed and production efficiency and reduce energy consumption to a certain extent. At the same time, it enhances the oxidizing atmosphere in the sintering process, which is conducive to reducing the FeO content in the finished sinter, improving the reduction performance of the finished sinter, and improving its quality, thus creating good raw material conditions for further production increase and coke saving in blast furnace ironmaking.

[0028] 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. An apparatus for improving the permeability of a bed of sintering material, characterized by: It includes a punching device, the punching device includes a punching support (1), a moving trolley (2) and a punching assembly (3) through a control center, the punching support is arranged above a trolley (5), the moving trolley (2) is arranged on the punching support (1), a motorized push rod (4) is further arranged on the moving trolley (2), and the punching assembly (3) is located at the bottom of the punching support (1) and connected with the push rod at the bottom of the motorized push rod (4).

2. The apparatus for improving the permeability of a sintering material layer according to claim 1, wherein: The punching device is provided with an igniter at a position 30 m away from the trolley (5) in the opposite direction.

3. The apparatus for improving the permeability of a sintering material layer according to claim 1, wherein: The punching device is provided with two groups, and the two groups of punching devices are the same in structure and are arranged at a distance interval of 1 m.

4. The apparatus for improving the permeability of a sintering material layer according to claim 1, wherein: The punching assembly (3) includes five nail teeth (31), each nail tooth (31) is arranged at an interval of 900 mm, and the stroke of the nail tooth (31) is 500 mm.

5. The apparatus for improving the permeability of a sintering material layer according to claim 1, wherein: The punching support (1) is provided with double-layer heat insulation asbestos (11) on the surface, and the bottom of the punching support (1) is provided with a heat radiation panel (12).

6. The apparatus for improving the permeability of a sintering material layer according to claim 1, wherein: The punching support (1) is provided with a position detection proximity switch (6) and a limiting fixed baffle (7) below.

7. The apparatus for improving the permeability of a sintering material layer according to claim 4, wherein: The nail tooth (31) is a right triangle with an arc-shaped groove in the middle, the side length is 40 mm, and a three-pyramid structure is formed.

8. The apparatus for improving the permeability of a sintering material layer according to claim 1, wherein: The moving trolley (2) is provided with a driving motor and a roller, the driving motor is controlled through a frequency converter, and the motorized push rod (4) is also controlled through a frequency converter.

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