Ore feeding system for gas-based shaft furnace

Abstract

The utility model relates to an ore feeding system for a gas-based shaft furnace. The ore feeding system comprises an ore tank system, a coating system and a feeding system, the coating system comprises a coating bin, at least one mixing tank and a coating sealing-tape machine, and the ore groove system is used for storing in-furnace ore raw materials and can convey the in-furnace ore raw materials to the coating sealing-tape machine. The discharging end of the coating bin is in butt joint with the feeding end of the mixing tank, the mixing tank is further connected with a water inlet, and the discharging end of the mixing tank right faces the adhesive tape coating machine. The feeding system comprises at least one surge bin and a feeding sealing-tape machine, the coating sealing-tape machine can convey the coated in-furnace ore raw materials into the corresponding surge bin, and the discharging end of each surge bin right faces the feeding sealing-tape machine. The ore feeding system can effectively prevent furnace charge from being bonded and meet the feeding requirement of the shaft furnace.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgy, in particular to an ore feeding system for a gas-based vertical furnace. Background Art

[0002] Traditional blast furnace ironmaking technology has been very mature after long-term development, but it also has inherent shortcomings, namely, it has a strong dependence on metallurgical coke, and the emission of large amounts of carbon dioxide and other harmful gases during blast furnace smelting has become one of the important causes of environmental pollution. Direct reduction non-blast furnace ironmaking technology represented by MEDREX, HYL and other technologies is becoming a cutting-edge technology for the sustainable development of the steel industry and achieving environmental friendliness.

[0003] The direct reduction shaft furnace uses pelletized ore or lump ore as raw material, which is directly fed from the furnace top, and the reduced sponge iron is discharged from the furnace bottom. The traditional blast furnace ore trough and feeding system generally feed qualified materials into the furnace in batches through the ore trough, screening device and weighing funnel. However, in the direct reduction technology of hydrogen metallurgy, the bonding of iron-containing furnace charge is a major problem of the technology, which cannot meet the feeding requirements of the shaft furnace.

[0004] Therefore, the inventor, relying on his many years of experience and practice in related industries, proposes an ore feeding system for a gas-based vertical furnace to overcome the defects of the prior art. Utility Model Content

[0005] The utility model aims to provide an ore feeding system for a gas-based vertical furnace, which can effectively prevent the charge from sticking and meet the vertical furnace feeding requirements.

[0006] The purpose of the utility model is achieved in this way. An ore feeding system for a gas-based vertical furnace includes an ore trough system, a coating system and a feeding system; the coating system includes a coating bin, at least one mixing tank and a coating belt machine, the ore trough system is used to store the ore raw materials entering the furnace, and can transport the ore raw materials entering the furnace to the coating belt machine; the discharge end of the coating bin is connected to the feed end of the mixing tank, the mixing tank is also connected to a water inlet, and the discharge end of the mixing tank is arranged opposite to the coating belt machine; the feeding system includes at least one buffer bin and a feeding belt machine, the coating belt machine can transport the coated ore raw materials entering the furnace to the corresponding buffer bin, and the discharge end of each buffer bin is arranged opposite to the feeding belt machine.

[0007] In a preferred embodiment of the present invention, the discharge end of the mixing tank is sequentially connected to a switch valve and a chute.

[0008] In a preferred embodiment of the present invention, the coating system further comprises at least one stirring device, which is arranged above the conveyor belt of the coating tape machine so as to be movable up and down and rotatable around its axis.

[0009] In a preferred embodiment of the present invention, the feeding system also includes a first three-way distributor and an intermediate belt machine. The feed port of the first three-way distributor is connected to the head of the coating tape machine, and its two discharge ports are respectively connected to the tail of the intermediate belt machine and the head of the feeding tape machine.

[0010] In a preferred embodiment of the present invention, there are two buffer bins, and the feeding system also includes a second three-way distributor, whose feed port is connected to the head of the intermediate belt conveyor, and whose two discharge ports are respectively connected to the feed ends of the two buffer bins.

[0011] In a preferred embodiment of the present invention, the exterior of each buffer bin is wrapped with a heat-insulating layer.

[0012] In a preferred embodiment of the present invention, a plurality of supports are fixedly provided on the outer circumference of each buffer bin, and a weighing device is placed under each support.

[0013] In a preferred embodiment of the present invention, a weighing belt feeder is provided below the discharge end of each buffer bin, and the head of the weighing belt feeder is arranged opposite to the feeding belt machine.

[0014] In a preferred embodiment of the utility model, the ore trough system includes multiple ore bins, multiple feeding feeders, multiple vibrating screens, multiple weighing funnels, feeding belt conveyors, crushing belt conveyors and crushing bins. The feeding feeders can feed the furnace ore raw materials stored in the ore bins into the vibrating screens. The vibrating screens can feed the qualified materials after screening to the feeding belt conveyors through the weighing funnels. They can also transport the crushed ore under the screen to the crushing bin through the crushing belt conveyors. The head of the feeding belt conveyors is connected to the tail of the coating belt conveyors.

[0015] In a preferred embodiment of the present invention, the plurality of ore bins include a plurality of ore storage bins and an ore return bin.

[0016] As described above, the ore feeding system of the utility model can spray the coating on the surface of the ore raw materials entering the furnace to form an anti-sticking layer by setting up a coating system and a feeding system; the coated ore can be buffered by using a buffer bin, so that the coated ore raw materials can be fully dried and the coating can adhere more firmly; thus, the ore raw materials can be effectively prevented from sticking in the vertical furnace, thereby providing the vertical furnace with qualified raw materials entering the furnace and meeting the vertical furnace feeding requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following drawings are only intended to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0018] Figure 1 : A schematic structural diagram of an ore feeding system for a gas-based vertical furnace provided by the utility model.

[0019] Figure 2 : It is a schematic diagram of the cooperation between the buffer bin provided by the utility model, the weighing belt feeder and the feeding belt machine.

[0020] Figure 3 : A schematic diagram of the cooperation between the chute, stirring device and coating tape machine provided by the utility model.

[0021] Description of Figure Numbers:

[0022] 1. Ore chute system; 11. Ore bin; 12. Feeder; 13. Vibrating screen; 14. Weighing funnel; 15. Feeding belt conveyor; 16. Ore crushing belt conveyor; 17. Ore crushing bin;

[0023] 2. coating system; 21. coating tank; 22. mixing tank; 221. chute; 23. coating tape machine; 24. stirring device;

[0024] 3. Feeding system; 31. First three-way distributor; 32. Middle belt conveyor; 33. Second three-way distributor; 34. Buffer bin; 341. Insulation layer; 342. Support; 343. Weighing device; 35. Weighing belt feeder; 36. Feeding belt conveyor;

[0025] 4. Furnace top receiving tank. DETAILED DESCRIPTION

[0026] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

[0027] like Figures 1 to 3 As shown, the present application provides an ore feeding system for a gas-based vertical furnace, including an ore trough system 1, a coating system 2 and a feeding system 3; the coating system 2 includes a coating bin 21, at least one mixing tank 22 and a coating belt machine 23, the ore trough system 1 is used to store the ore raw materials entering the furnace, and can transport the ore raw materials entering the furnace to the coating belt machine 23; the discharge end of the coating bin 21 is connected to the feed end of the mixing tank 22, and the mixing tank 22 is also connected to a water inlet, and the discharge end of the mixing tank 22 is arranged opposite to the coating belt machine 23; the feeding system 3 includes at least one buffer bin 34 and a feeding belt machine 36, the coating belt machine 23 can transport the coated ore raw materials entering the furnace to the corresponding buffer bin 34, and the discharge end of each buffer bin 34 is arranged opposite to the feeding belt machine 36.

[0028] The coating bin 21 is used to store coatings, and the water inlet is connected to the water inlet pipe. A stirrer is provided in the mixing tank 22, and the mixing tank 22 is used to mix the coating and water into a coating slurry. After the ore raw materials entering the furnace are transported to the coating tape machine 23 through the ore trough system 1, the coating slurry in the mixing tank 22 is sprayed on the ore raw materials entering the furnace on the coating tape machine 23, and a coating is formed on the surface of the ore raw materials entering the furnace, which can prevent adhesion during the reaction in the furnace. The head of the feeding tape machine 36 is used to dock with the top receiving tank 4 of the gas-based vertical furnace. After the coated ore is transported to the head of the coating tape machine 23, it can enter the corresponding buffer bin 34 for buffering, and then enter the vertical furnace.

[0029] Therefore, the ore feeding system of the present application can spray the coating on the surface of the ore raw materials entering the furnace to form an anti-sticking layer by setting up the coating system 2 and the feeding system 3; the buffer bin 34 can be used to cache the coated ore, so that the coated ore raw materials can be fully dried and the coating can adhere more firmly; and thus, the ore raw materials can be effectively prevented from sticking in the vertical furnace, thereby providing the vertical furnace with qualified raw materials entering the furnace and meeting the vertical furnace feeding requirements.

[0030] In a specific implementation, the discharge end of the mixing tank 22 is sequentially connected with a switch valve and a chute 221. The chute 221 can be used to more easily distribute the material so as to distribute the coating slurry on the ore to be coated.

[0031] The number of the coating bin 21 is one, and the number of the mixing tanks 22 is preferably multiple, and they are evenly spaced along the length direction of the coating tape machine 23. The bottom of each mixing tank 22 is connected to a corresponding switch valve and a chute 221, which is more conducive to achieving uniform coating. The feed end of each mixing tank 22 is connected to the discharge end of the coating bin 21 through a corresponding branch pipeline, and a corresponding switch valve is set on the corresponding branch pipeline.

[0032] Preferably, the coating system 2 further comprises at least one stirring device 24 , which is arranged above the conveyor belt of the coating tape machine 23 so as to be movable up and down and rotatable around its axis.

[0033] The stirring device 24 can be connected to the frame of the coating belt machine 23, and it has the function of moving up and down and rotating around the axis. After the coating in the mixing tank 22 is sprayed on the ore raw material entering the furnace on the coating belt machine 23, the coating has a certain thickness on the conveyor belt of the coating belt machine 23; the stirring device 24 can be used without moving, and only the stirring device 24 can touch the coating to play a certain scraping and sliding effect on the coating on the conveyor belt; the stirring device 24 can also be used to move up and down to stir the coating within the thickness range; the stirring device 24 can also be used to rotate around the axis to stir the coating within the thickness range; the stirring device 24 can be used to move up and down and rotate around the axis at the same time, or only one can be used, depending on the actual coating effect. In addition, the stirring device 24 can be used to make the coating more uniform, thereby forming a more uniform coating on the surface of the ore.

[0034] The specific structure of the stirring device 24 can adopt any existing feasible form, as long as it can realize up and down movement and rotation around the axis. The number of stirring devices 24 can be determined according to the coating needs. Generally, the number of stirring devices 24 is multiple and evenly spaced along the length direction of the coating tape machine 23, which is more conducive to achieving uniform coating.

[0035] Furthermore, the feeding system 3 also includes a first three-way distributor 31 and an intermediate belt machine 32. The feed port of the first three-way distributor 31 is connected to the head of the coating belt machine 23, and its two discharge ports are respectively connected to the tail of the intermediate belt machine 32 and the head of the feeding belt machine 36.

[0036] By setting a first three-way distributor 31 at the head of the coating tape conveyor 23, the coated ore can enter the vertical furnace in two ways through the first three-way distributor 31: one way is to enter the buffer bin 34 for buffering through the intermediate tape conveyor 32 and then enter the vertical furnace, and the other way is to directly enter the furnace top receiving tank 4 through the feeding tape conveyor 36. Under normal circumstances, the coated ore enters the buffer bin 34 for buffering, so that the coating can be fully dried; when the equipment on this line fails, the coated ore directly enters the vertical furnace through the feeding tape conveyor 36 to avoid affecting the normal production of the vertical furnace.

[0037] The number of buffer bins 34 can be determined as needed. For example, in this embodiment, there are two buffer bins 34. The feeding system 3 also includes a second three-way distributor 33. The feed port of the second three-way distributor 33 is connected to the head of the intermediate belt conveyor 32, and its two discharge ports are respectively connected to the feed ends of the two buffer bins 34. The second three-way distributor 33 allows the coated ore to enter the two buffer bins 34 for buffering, and the two buffer bins 34 can be used alternately.

[0038] Reference Figure 2 Each buffer bin 34 is wrapped with an insulation layer 341 on the outside to prevent the ore in the bin from freezing due to severe cold weather.

[0039] A plurality of supports 342 are fixedly provided on the outer circumference of each buffer bin 34 , and a weighing device 343 is placed under each support 342 for controlling the amount of material in the bin.

[0040] The number of the supports 342 is the same as the number of the weighing devices 343. Specifically, the number of the weighing devices 343 can be determined according to the shape of the buffer bin 34. For example, in this embodiment, the buffer bin 34 is cylindrical, and three weighing devices 343 are evenly arranged in the circumference to ensure the stability of the buffer bin 34 and the accuracy of weighing. The sum of the weights weighed by the three weighing devices 343 is the total weight of the buffer bin 34 and the material therein, which can facilitate the operator to understand whether the material in the buffer bin 34 is full. Compared with setting a level meter on the top of the buffer bin 34 to understand the amount of material in the bin, the use of the weighing device 343 can effectively avoid the influence of dust on the detection data, and the detection is more accurate.

[0041] A weighing belt feeder 35 is provided below the discharge end of each buffer bin 34 , and the head of the weighing belt feeder 35 is arranged directly opposite to the feeding belt conveyor 36 .

[0042] The discharge end of each buffer bin 34 is connected with a corresponding switch valve (for example, a bin gate), and the switch valve is set to the weighing belt feeder 35. The material in the bin is fed to the feeding belt conveyor 36 through the switch valve and the weighing belt feeder 35. The weighing belt feeder 35 is mainly used to control the discharge amount of the buffer bin 34. Specifically, the discharge amount of the buffer bin 34 falling to the weighing belt feeder 35 can be detected by its own weighing function, and then the amount of material delivered to the feeding belt conveyor 36 can be controlled by controlling the running speed of the weighing belt feeder 35. The structure of the weighing belt feeder 35 is an existing structure and will not be described in detail here.

[0043] Furthermore, the ore trough system 1 includes multiple ore bins 11, multiple feeding feeders 12, multiple vibrating screens 13, multiple weighing funnels 14, feeding belt conveyors 15, crushing belt conveyors 16 and crushing bins 17. The feeding feeders 12 can feed the furnace ore raw materials stored in the ore bin 11 into the vibrating screen 13. The vibrating screen 13 can feed the qualified materials after screening to the feeding belt conveyor 15 through the weighing funnel 14, and can also transport the crushed ore under the screen to the crushing bin 17 through the crushing belt conveyor 16 (the crushed ore in the crushing bin 17 can be transported to the corresponding position for processing through the corresponding belt conveyor). The head of the feeding belt conveyor 15 is connected to the tail of the coating belt conveyor 23.

[0044] The number of ore bins 11, feeders 12, vibrating screens 13 and weighing hoppers 14 is the same, the number of feeder belts 15, crushing belts 16 and crushing bins 17 is one, and the multiple ore bins 11 preferably include multiple ore storage bins and one ore return bin, each ore storage bin is used to store the incoming ore raw materials, and the ore return bin is used to store the ore that has not been completely reduced in the initial stage of the vertical furnace. The specific number of ore bins 11 is determined according to the actual vertical furnace feeding needs. For example, in this embodiment, a total of three ore storage bins are provided. A corresponding switch valve (for example, a bin gate) is connected to the discharge end of each ore bin 11. When in use, the material in the ore bin 11 is fed to the vibrating screen 13 through the bin lower gate and the feeder 12 to screen out the crushed ore. The material with qualified particle size enters the weighing funnel 14, and the crushed ore under the screen is transported to the crushing bin 17 through the crushing belt 16. The feeding machine 12 transports the qualified materials in the weighing hopper 14 to the adhesive tape coating machine 23 .

[0045] In summary, the ore feeding system in this embodiment, through the cooperation of the ore trough system 1, the coating system 2 and the feeding system 3, the ore trough system 1 is provided with an ore storage bin and an ore return bin, which can process the return materials (unqualified products in the initial stage of the vertical furnace opening) at the beginning of the vertical furnace opening under the condition of meeting the vertical furnace feeding ratio, and mix them with the raw material ore into the furnace; the raw materials are screened in the ore trough, and a weighing funnel 14 is set under the trough, and the materials can be discharged into the furnace according to the vertical furnace charging instruction. The coating system 2 sprays the coating on the surface of the raw material through the treatment of the coating to form an anti-adhesion layer; the coating is evenly coated on the surface of the raw material entering the furnace to avoid the adhesion of the raw material in the furnace; the post-coating route is divided into two routes: one route allows the coated raw material to enter the buffer bin 34 for buffering; when there is a fault in this equipment, the coated material is directly fed into the furnace according to another route to avoid affecting the normal production of the vertical furnace. The feeding system 3 is provided with a buffer bin 34 so that the coated ore raw materials can be fully dried and the coating can adhere firmly; at the same time, the feeding system 3 is provided with a backup system. When the buffer equipment fails, the coated raw materials are directly fed into the furnace to avoid affecting normal production; the buffer bin 34 is provided with external insulation measures for drying the coated ore in winter.

[0046] The above is only an illustrative embodiment of the utility model, and is not intended to limit the scope of the utility model. Any equivalent changes and modifications made by any technician in the field without departing from the concept and principle of the utility model should fall within the scope of protection of the utility model.

Claims

1. An ore feeding system for a gas-based shaft furnace, characterized in that: Including ore chute system, coating system and feeding system; The coating system includes a coating bin, at least one mixing tank and a coating tape machine. The ore trough system is used to store the ore raw materials entering the furnace and can transport the ore raw materials entering the furnace to the coating tape machine. The discharge end of the coating bin is connected to the feed end of the mixing tank. The mixing tank is also connected to a water inlet. The discharge end of the mixing tank is arranged directly opposite to the coating tape machine. The feeding system includes at least one buffer bin and a feeding belt conveyor. The coating belt conveyor can transport the coated ore raw materials entering the furnace to the corresponding buffer bin. The discharge end of each buffer bin is arranged opposite to the feeding belt conveyor.

2. The ore feeding system for a gas-based shaft furnace according to claim 1, characterized in that: The discharge end of the mixing tank is connected with a switch valve and a chute in sequence.

3. The ore feeding system for a gas-based shaft furnace according to claim 1, characterized in that: The coating system further comprises at least one stirring device, which is arranged above the conveyor belt of the coating tape machine so as to be movable up and down and rotatable around its axis.

4. The ore feeding system for a gas-based shaft furnace according to claim 1, characterized in that: The feeding system also includes a first three-way distributor and an intermediate belt conveyor. The feed port of the first three-way distributor is connected to the head of the coating belt conveyor, and its two discharge ports are respectively connected to the tail of the intermediate belt conveyor and the head of the feeding belt conveyor.

5. The ore feeding system for a gas-based shaft furnace according to claim 4, characterized in that: There are two buffer bins, and the feeding system also includes a second three-way distributor, the feed port of the second three-way distributor is connected to the head of the intermediate belt conveyor, and its two discharge ports are respectively connected to the feed ends of the two buffer bins.

6. The ore feeding system for a gas-based shaft furnace according to claim 1, characterized in that: The outside of each buffer bin is wrapped with a heat-insulating layer.

7. The ore feeding system for a gas-based shaft furnace according to claim 1, characterized in that: A plurality of supports are fixedly arranged on the outer circumference of each buffer bin, and a weighing device is placed under each support.

8. The ore feeding system for a gas-based shaft furnace according to claim 1, characterized in that: A weighing belt feeder is provided below the discharge end of each buffer bin, and the head of the weighing belt feeder is arranged directly opposite to the feeding belt conveyor.

9. The ore feeding system for a gas-based shaft furnace according to claim 1, characterized in that: The ore trough system includes multiple ore bins, multiple feeding feeders, multiple vibrating screens, multiple weighing funnels, feeding belt conveyors, crushing belt conveyors and crushing bins. The feeding feeders can feed the furnace ore raw materials stored in the ore bins into the vibrating screens. The vibrating screens can feed the qualified materials after screening to the feeding belt conveyors through the weighing funnels. They can also transport the crushed ore under the screen to the crushing bin through the crushing belt conveyors. The head of the feeding belt conveyor is connected to the tail of the coating belt conveyor.

10. The ore feeding system for a gas-based shaft furnace according to claim 9, characterized in that: The plurality of ore bins include a plurality of ore storage bins and an ore return bin.

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