Coating system for gas-based shaft furnace ore feedstock

Abstract

This invention provides a coating system for ore raw materials in a gas-based vertical shaft furnace, comprising: a coating feeding mechanism, a stirrer, a dry coating chute, a wet coating feeding chute, a wet coating discharge chute, a conveying mechanism, and a coating device. The coating device includes a first material distribution mechanism, a stirring plow, and a second material distribution mechanism arranged along the conveying mechanism. The coating feeding mechanism is connected to the first material distribution mechanism via the dry coating chute. The coating feeding mechanism is connected to the inlet of the stirrer via the wet coating feeding chute, and the outlet of the stirrer is connected to the second material distribution mechanism via the wet coating discharge chute. This invention solves the technical problem in direct reduction technology where the process of preparing a coating on the surface of the ore raw material is difficult and the effectiveness of the coating is hard to guarantee.

Description

Technical Field

[0001] This invention relates to the technical field of direct reduction ironmaking, and more particularly to a coating system for gas-based shaft furnace ore feedstock. Background Technology

[0002] Traditional blast furnace ironmaking technology is heavily reliant on metallurgical coke, and the blast furnace smelting process emits large amounts of carbon dioxide and other harmful gases, making it a significant contributor to environmental pollution. Direct reduction non-blast furnace ironmaking technologies, such as MEDREX and HYL, offer environmental advantages and are beneficial to the sustainable development of the steel industry. Direct reduction shaft furnaces use pellets or lump ore as raw materials, adding them directly from the top of the furnace, and the reduced sponge iron is discharged from the bottom.

[0003] Currently, the adhesion of ferrous charge is a major challenge in direct reduction technology. Applying a coating to the surface of pellets or lump ore can inhibit adhesion and improve the problem. However, the process of preparing this coating on the ore surface is difficult, making it challenging to guarantee its effectiveness. Summary of the Invention

[0004] The purpose of this invention is to provide a coating system for gas-based vertical shaft furnace ore raw materials, in order to solve the technical problem that the process of preparing coatings on the surface of ore raw materials in direct reduction technology is difficult and it is hard to ensure the effectiveness of the coating.

[0005] The above-mentioned objectives of the present invention can be achieved by the following technical solutions:

[0006] This invention provides a coating system for ore raw materials in a gas-based vertical shaft furnace, comprising: a coating feeding mechanism, a stirrer, a dry coating chute, a wet coating feeding chute, a wet coating discharge chute, a conveying mechanism, and a coating device. The coating device includes a first material distribution mechanism, a stirring plow, and a second material distribution mechanism arranged along the conveying mechanism. The coating feeding mechanism is connected to the first material distribution mechanism via the dry coating chute. The coating feeding mechanism is connected to the inlet of the stirrer via the wet coating feeding chute, and the outlet of the stirrer is connected to the second material distribution mechanism via the wet coating discharge chute.

[0007] In a preferred embodiment, the first fabric feeding mechanism includes a vibrating fabric feeder, and the second fabric feeding mechanism includes a fabric chute.

[0008] In a preferred embodiment, at least one of the mixing plows is provided between the first and second fabric spreading mechanisms along the forward direction of the conveying mechanism.

[0009] In a preferred embodiment, at least one of the stirring plows is provided in front of the vibrating cloth distributor along the forward direction of the conveying mechanism.

[0010] In a preferred embodiment, the conveying mechanism includes a coating belt machine arranged in a horizontal direction, and the first spreading mechanism, the stirring plow, and the second spreading mechanism are arranged along the forward direction of the coating belt machine.

[0011] In a preferred embodiment, the conveying mechanism includes an infeed tape machine that feeds material to the coating tape machine, and the infeed tape machine is equipped with a humidity sensor.

[0012] In a preferred embodiment, the coating system includes at least two sets of the coating feeding mechanism, the agitator, the dry coating chute, the wet coating feeding chute, and the wet coating discharge chute. The dry coating chute corresponds one-to-one with the first coating mechanism, and the wet coating discharge chute corresponds one-to-one with the second coating mechanism.

[0013] In a preferred embodiment, the coating system includes a paint hopper, which is connected to the paint feeding mechanism via a paint chute.

[0014] In a preferred embodiment, the paint hopper includes vertically distributed cylindrical and conical sections. A hopper loosener is provided at the bottom of the conical section. The hopper loosener is connected to a paint chute, and the paint chute is equipped with a slide valve.

[0015] In a preferred embodiment, a plurality of air cannons are provided on the outer periphery of the cone segment.

[0016] In a preferred embodiment, a support is connected to the outer periphery of the cylindrical segment, and a paint tank weighing device is provided at the bottom of the support.

[0017] In a preferred embodiment, the cylindrical section, the conical section, the hopper loosener, the paint feeding mechanism, the agitator, and the coating device are arranged sequentially from top to bottom.

[0018] The features and advantages of this invention are:

[0019] The coating feeding mechanism delivers coating material to the agitator via a wet coating chute. Water and coating material mix in the agitator to form a wet coating slurry with a specific concentration. This wet coating slurry is then conveyed to the second coating distribution mechanism via a wet coating discharge chute. The second distribution mechanism applies the wet coating slurry to the surface of the ore feedstock on the conveying mechanism, achieving wet coating. The first distribution mechanism applies coating material delivered by the coating feeding mechanism via a dry coating chute to the surface of the ore feedstock on the conveying mechanism, achieving dry coating. A stirring plow agitates the ore feedstock on the conveying mechanism to ensure uniform coating. This coating system can achieve both wet and dry coating methods. The choice between wet and dry coating depends on the moisture content of the incoming ore, which helps ensure coating effectiveness, improves versatility, reduces process difficulty, and helps improve the adhesion problem of iron-containing furnace charge. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the coating system for gas-based vertical shaft furnace ore raw materials provided by the present invention;

[0022] Figure 2 for Figure 1 The diagram shows a structural schematic of the coating system in a coating system for gas-based vertical shaft furnace ore feedstock.

[0023] Figure 3 for Figure 1 The diagram shows a structural schematic of a coating device in a coating system for gas-based vertical shaft furnace ore raw materials.

[0024] Figure 4 for Figure 1 The diagram shows a structural schematic of the coating hopper in a coating system for gas-based vertical shaft furnace ore feedstock.

[0025] Explanation of icon numbers:

[0026] 12. Paint tank; 121. Cylindrical section; 122. Conical section;

[0027] 13. Support; 14. Weighing device;

[0028] 11. Dust collector; 15. Paint delivery pipeline; 16. Air cannon;

[0029] 21. Hopper loosener; 22. Slide valve;

[0030] 231. Paint chute; 232. Wet coating feeding chute; 233. Dry coating chute; 234. Wet coating discharge chute;

[0031] 24. Paint feeding mechanism; 25. Agitator; 26. Water pipe;

[0032] 311. Second feeding mechanism; 31. Feed chute; 32. Mixing plow; 331. First feeding mechanism; 33. Vibrating feeder;

[0033] 340. Conveying mechanism; 34. Adhesive tape coating machine; 35. Incoming material conveyor belt machine;

[0034] 36. Humidity sensor. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] This invention provides a coating system for gas-based shaft furnace ore feedstock, such as... Figures 1-3 As shown, the system includes: a paint feeding mechanism 24, a mixer 25, a dry coating chute 233, a wet coating feeding chute 232, a wet coating discharge chute 234, a conveying mechanism 340, and a coating device. The coating device includes a first spreading mechanism 331, a stirring plow 32, and a second spreading mechanism 311 arranged along the conveying mechanism 340. The paint feeding mechanism 24 is connected to the first spreading mechanism 331 through the dry coating chute 233. The paint feeding mechanism 24 is connected to the inlet of the mixer 25 through the wet coating feeding chute 232, and the outlet of the mixer 25 is connected to the second spreading mechanism 311 through the wet coating discharge chute 234.

[0037] The coating feeding mechanism 24 delivers coating material to the agitator 25 via the wet coating feed chute 232. A water pipe connected to the inlet of the agitator 25 supplies water to the agitator 25. The water and coating material mix in the agitator 25 to form a wet coating slurry with a certain concentration. The wet coating slurry is then conveyed to the second spreading mechanism 311 via the wet coating discharge chute 234. The second spreading mechanism 311 applies the wet coating slurry to the surface of the ore raw material on the conveying mechanism 340, achieving wet coating. The first spreading mechanism 331 applies the coating material delivered by the coating feeding mechanism 24 via the dry coating chute 233 to the surface of the ore raw material on the conveying mechanism 340, achieving dry coating. The stirring plow 32 agitates the ore raw material on the conveying mechanism 340 to ensure uniform coating. This coating system can achieve both wet and dry coating methods. The choice between wet and dry coating methods depends on the moisture content of the incoming ore, which helps ensure the effectiveness of the coating, improves versatility, reduces process difficulty, and helps improve the adhesion problem of iron-containing furnace materials.

[0038] In some embodiments, the first material distribution mechanism 331 includes a vibrating material distributor 33, and the second material distribution mechanism 311 includes a material distribution chute. The lower part of the dry coating chute 233 is connected to the vibrating material distributor 33 to convey dry coating material to the vibrating material distributor for distributing dry material to the ore raw material. The upper part of the material distribution chute 31 is connected to the agitator 25 through a wet coating discharge chute 234, so that the wet coating slurry can be coated onto the ore raw material on the conveying mechanism 340 by the material distribution chute, thereby realizing the application of coating slurry to the ore raw material.

[0039] The first material spreading mechanism 331, the mixing plow 32, and the second material spreading mechanism 311 are arranged along the forward direction of the coating belt conveyor 340. The specific order is not limited. The first material spreading mechanism 331 can be before the second material spreading mechanism 311, or the second material spreading mechanism 311 can be before the first material spreading mechanism 331.

[0040] Furthermore, along the forward direction of the conveying mechanism 340, at least one stirring plow 32 is provided between the vibrating distributor 33 and the distribution chute. The stirring action of the stirring plow 32 helps to improve the uniformity of the coating on the surface of the furnace slag raw materials. Figure 3 As shown, along the forward direction of the conveying mechanism 340, at least one stirring plow 32 is arranged in front of the vibrating distributor. The furnace ore raw material moves from back to front along the forward direction of the conveying mechanism 340. After being coated by the vibrating distributor, the stirring plow 32 agitates the material, which helps to form a uniform coating on the surface of the furnace ore raw material and more effectively improves the adhesion problem of iron-containing furnace charge. In one embodiment, the vibrating distributor includes a downwardly inclined chute and a vibrator disposed outside the chute and fixedly connected to the chute. During operation, the vibrator vibrates and drives the chute to vibrate, causing the dry coating to run downward and forward and flow out of the chute. The vibrating distributor 33 can adopt an existing structure.

[0041] In one embodiment, the conveying mechanism 340 includes a coating belt machine arranged horizontally, and a first material spreading mechanism 331, a stirring plow 32, and a second material spreading mechanism 311 arranged along the forward direction of the coating belt machine. Specifically, three sets of stirring plows 32 are respectively provided between the vibrating material spreader 33 and the material chute 31, and in front of the vibrating material spreader 33, for turning over the ore raw materials on the coating belt machine 34 to make the coating uniform.

[0042] Furthermore, the conveying mechanism 340 includes an infeed conveyor belt that feeds material to the coating conveyor belt 34. The infeed conveyor belt 35 is equipped with a humidity sensor. The infeed conveyor belt 35 is used to convey the ore raw material to be coated onto the coating conveyor belt 34. The humidity sensor is used to detect the humidity of the infeed ore and select either a "wet coating" or "dry coating" method. Preferably, a humidity sensor 36 for detecting the humidity of the infeed material is provided at the head of the infeed conveyor belt 35; multiple sets of humidity sensors 36 can be provided to comprehensively measure the humidity value of the infeed material.

[0043] The mixer mixes the paint with water. Depending on the humidity level, different paint concentrations can be achieved by controlling the ratio of water added to the paint in the mixer, so that the paint concentration is compatible with the humidity of the incoming material.

[0044] In some embodiments, the coating system includes at least two sets of paint feeding mechanisms, a mixer, a dry coating chute, a wet coating feeding chute, and a wet coating discharging chute. The dry coating chute corresponds one-to-one with the first coating mechanism 331, and the wet coating discharging chute 234 corresponds one-to-one with the second coating mechanism 311. There are two sets of "wet coating" and "dry coating" routes. When a certain coating method is selected, the two sets of routes can operate simultaneously, or one can be used while the other is on standby.

[0045] Furthermore, the paint feeding mechanism 24 employs a loss-in-weight feeder and has a material distribution function, capable of controlling the amount of paint entering the lower agitator 25 or the dry coating chute 233. The paint feeding mechanism 24 also has a weighing function, capable of controlling the amount of paint entering downstream. Alternatively, other equipment suitable for powder conveying, such as a screw conveyor, can also be used for the paint feeding mechanism.

[0046] In one embodiment, the coating system includes a paint hopper 12, which is connected to a paint feeding mechanism via a paint chute. Further, the paint hopper 12 includes vertically distributed cylindrical sections 121 and conical sections 122, such as... Figure 1 and Figure 4As shown, a silo loosener is installed at the bottom of the conical section 122. The silo loosener is connected to the paint chute, which is equipped with a gate valve 22 to help prevent blockage of the paint silo 12. Specifically, the upper part of the silo loosener 21 is fixedly connected to the outlet of the conical section 122 of the paint silo 12 to prevent silo blockage; the silo loosener 21 is divided into two paths, which can be arranged in the same way. The lower part of the silo loosener 21 is connected to the paint feeding mechanism 24 through the paint chute 231.

[0047] Furthermore, multiple air cannons are installed around the outer periphery of the conical section 122 to clear blockages in the coating within the tank and aid in flow. The air cannons can be installed along the outer wall of the conical section 122. It should be noted that multiple sets of air cannons 16 can be installed around the outer wall of the tank, each set at a different elevation to increase the effective range of the air cannons. The number of air cannons is not limited and can be arranged as needed. Preferably, the number of air cannons can be four, arranged in pairs facing each other, for a total of two sets. The two facing each other form one set, located at the same elevation. The two sets are respectively set at different elevations to increase the effective range of the air cannons.

[0048] In one embodiment, a support is connected to the outer periphery of the cylindrical segment 121, and a weighing device for the paint tank 12 is provided at the bottom of the support to detect the weight of the paint in the paint tank 12. When the weight value is lower than a set value, paint is added to the paint tank 12. Figure 4 As shown, a support 13 is provided outside the paint silo 12 and is fixedly connected to the paint silo 12. A weighing device 14 sits on the platform under the support 13. Preferably, three sets of supports 13 and weighing devices 14 are arranged along the circumference of the silo to achieve the stability of the silo and the accuracy of weighing.

[0049] The paint silo 12 can be a paint silo. The paint conveying pipe 15 transports the paint for coating the ore raw materials to the paint silo 12. A dust collector 11 is installed on the top of the paint silo 12 for dust removal when replenishing the material into the silo. When the weighing device 14 detects that the weight value in the silo is lower than the set value, the paint conveying pipe 15 is activated to inject paint into the silo.

[0050] like Figure 1 As shown, the cylindrical section, conical section 122, hopper loosener, paint feeding mechanism, agitator and coating device are arranged in sequence from top to bottom, which helps to ensure that the raw materials on the conveying mechanism 340 can be wet coated smoothly and smoothly, as well as dry coated smoothly.

[0051] like Figure 2As shown, a water pipe 26 connected to the inlet of the mixer 25 supplies water to the mixer 25. In one embodiment, a valve is provided on the wet coating discharge chute 234 to control the discharge and shut-off of the mixer 25. The water pipe 26 is used to add water to the mixer 25 and is equipped with an opening / closing and flow control device. An automatic mixing device is provided inside the mixer 25 to mix the dry coating with water evenly to form a coating slurry. The lower part of the mixer 25 is connected to the material distribution chute 31 through the wet coating discharge chute 234. A detection device is provided on the wet coating feeding chute 232 to detect whether there is a blockage in the wet coating feeding chute 232 and to control the amount of material fed into the mixer 25.

[0052] The coating system realizes two modes: "dry coating" and "wet coating". The "dry coating" mode is realized by the paint feeding mechanism 24, the dry coating chute 233, and the vibrating distributor 33; the "wet coating" mode is realized by the paint feeding mechanism 24, the wet coating feeding chute 232, the agitator 25, the wet coating discharge chute 234, and the distribution chute 31.

[0053] The working process of this coating system includes:

[0054] (1) When the incoming conveyor belt 35 delivers the ore raw material to be coated to the inlet of the system, the humidity sensor 36 located at the head of the incoming conveyor belt 35 detects the humidity of the ore raw material to be coated.

[0055] (2) When the humidity value is less than the set value, a "wet coating" signal is sent to the control system and the control system starts the "wet coating" mode; otherwise, the "dry coating" mode is started.

[0056] (3) If “wet coating” is used, the flow control device on the water pipe 26 and the weighing device on the paint feeding mechanism 24 control the amount of water and paint entering the mixer respectively to achieve different coating concentrations. The control system controls the amount of water and paint added by measuring the humidity value through the humidity sensor 36.

[0057] (4) When the weighing device 14 detects that the amount of paint in the paint silo 12 has decreased to the set value, the weighing device 14 sends a replenishment signal to the paint conveying pipeline 15. After receiving the replenishment signal, the paint conveying pipeline 15 starts the dust collector 11 and then replenishes the silo. At the same time, the weighing device 14 measures the amount of paint in the silo in real time. When the maximum storage capacity is reached, the paint conveying pipeline 15 stops working, and the dust collector 11 stops in turn.

[0058] (5) When the paint silo 12 is blocked, the air cannons 16 on the outer wall of the silo will work to keep the paint flowing inside the silo. The air cannons 16 arranged around the outer wall of the silo can fire in groups in a cycle or multiple groups can fire at the same time, with the purpose of keeping the paint flowing inside the silo.

[0059] The advantages of this coating system include: (1) it realizes two coating methods, "wet coating" and "dry coating"; (2) it can select "wet coating" or "dry coating" by detecting the moisture content of the incoming ore; (3) it can achieve different coating slurry concentrations by controlling the amount of water added and the amount of coating by the agitator; (4) each coating method is set up with two groups, which can work at the same time or one can be used and the other can be on standby; (5) the agitator 32 promotes uniform coating; (6) the amount of coating material can be controlled by the weighing device, and the air cannon set in the cone section 122 of the coating hopper 12 can avoid material blockage in the hopper.

[0060] The above descriptions are merely a few embodiments of the present invention. Those skilled in the art can make various modifications or variations to the embodiments of the present invention based on the content disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A coating system for gas-based shaft furnace ore feedstock, characterized in that, include: The coating device includes a paint feeding mechanism, a mixer, a dry coating chute, a wet coating feeding chute, a wet coating discharging chute, a conveying mechanism, and a coating device. The coating device includes a first spreading mechanism, a stirring plow, and a second spreading mechanism arranged along the conveying mechanism. The first spreading mechanism includes a vibrating spreader. At least one stirring plow is provided between the first spreading mechanism and the second spreading mechanism along the forward direction of the conveying mechanism. At least one stirring plow is provided in front of the vibrating spreader along the forward direction of the conveying mechanism. The paint feeding mechanism is connected to the first spreading mechanism via the dry coating chute; the paint feeding mechanism is connected to the inlet of the agitator via the wet coating feeding chute, and the outlet of the agitator is connected to the second spreading mechanism via the wet coating discharge chute. The conveying mechanism includes: a coating belt machine arranged in a horizontal direction, and the first material spreading mechanism, the stirring plow, and the second material spreading mechanism arranged in the forward direction of the coating belt machine; The material feeding tape machine is equipped with a humidity sensor to detect the humidity of the incoming ore in order to select between wet or dry coating.

2. The coating system for gas-based shaft furnace ore raw materials according to claim 1, characterized in that, The second fabric feeding mechanism includes a fabric chute.

3. The coating system for gas-based shaft furnace ore raw materials according to claim 1, characterized in that, The coating system includes at least two sets of coating feeding mechanisms, the agitator, the dry coating chute, the wet coating feeding chute, and the wet coating discharge chute. The dry coating chute corresponds one-to-one with the first coating mechanism, and the wet coating discharge chute corresponds one-to-one with the second coating mechanism.

4. The coating system for gas-based shaft furnace ore feedstock according to any one of claims 1-3, characterized in that, The coating system includes a paint hopper, which is connected to the paint feeding mechanism via a paint chute.

5. The coating system for gas-based shaft furnace ore raw materials according to claim 4, characterized in that, The paint hopper includes vertically distributed cylindrical and conical sections. A hopper loosener is installed at the bottom of the conical section. The hopper loosener is connected to a paint chute, and the paint chute is equipped with a slide valve.

6. The coating system for gas-based shaft furnace ore feedstock according to claim 5, characterized in that, Multiple air cannons are installed on the outer periphery of the cone section.

7. The coating system for gas-based shaft furnace ore raw materials according to claim 5, characterized in that, The outer periphery of the cylindrical section is connected to a support, and a paint tank weighing device is provided at the bottom of the support.

8. The coating system for gas-based shaft furnace ore feedstock according to claim 5, characterized in that, The cylindrical section, the conical section, the hopper loosener, the paint feeding mechanism, the agitator, and the coating device are arranged sequentially from top to bottom.

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