Blast furnace top stabilized platform material distribution device

Abstract

The utility model relates to a blast furnace top stabilized platform material distribution device which comprises a furnace top device, the bottom of the furnace top device is provided with a rotating chute, a rotating motor and a tilting motor, the output end of the rotating motor and the output end of the tilting motor are connected with the rotating chute, and the rotating motor is used for driving the rotating chute to rotate in the horizontal direction. The tilting motor is used for driving the rotary chute to rotate in the vertical direction; an input port is formed in the top of the furnace body, a containing cavity is formed in the furnace body, and the rotating chute extends into the containing cavity through the input port. Through the arrangement, a material mixing area can be eliminated or reduced, and ore rolling does not occur frequently any more, so that a stable ore platform is constructed, and the purpose of stabilizing blast furnace edge airflow is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgy, in particular to a material distributing device for a stabilizing platform on a blast furnace top. Background Art

[0002] The charge column of a blast furnace is determined by the distribution form, distribution system and physical characteristics of the charge. The charge type, particle size, mixing state of different types of charge and distribution of ore-coke ratio in the charge column are all uneven. Therefore, the resistance to the gas flow in the cross section of the charge column in the furnace is different in both the circumference and the radial direction. Figure 1 As shown, the blast furnace charge column is layered in the furnace body 1 according to the charging order and loaded into the coke layer 2 and the ore layer 3 through the rotating chute 6. The difference in air permeability resistance between the two is generally 3-4 times, and the pile angles they form in the furnace are also different.

[0003] In most traditional blast furnaces, the tilting angles of ore and coke are the same. When the ore is loaded, it falls on the coke layer under the action of its gravity and impact force, and a sliding surface will be generated in the coke layer. If the shear stress of the sliding surface is greater than the critical stress, the coke layer will move along the sliding surface to form a mixed area. The uneven air permeability resistance causes unstable airflow. Experiments have shown that the larger the batch weight of the ore, the more serious the formation of the mixed area, resulting in insufficient airflow in the center of the blast furnace, too low temperature of the dead material column in the hearth, and unstable airflow at the edge of the blast furnace, which brings a series of adverse effects on the blast furnace condition. Utility Model Content

[0004] To this end, the technical problem to be solved by the utility model is to overcome the problem in the prior art that most blast furnace ore and coke distribution have the same tilting angle, which easily forms a mixed material area, resulting in insufficient airflow in the center of the blast furnace and too low temperature of the dead material column in the furnace cylinder, thereby providing a blast furnace top stable platform distribution device.

[0005] In order to solve the above technical problems, the utility model provides a blast furnace top stabilizing platform material distribution device, comprising:

[0006] A furnace top device, the bottom of which is provided with a rotating chute, and a rotating motor and a tilting motor respectively connected to the rotating chute at the output ends, the rotating motor is used to drive the rotating chute to rotate in the horizontal direction, and the tilting motor is used to drive the rotating chute to rotate in the vertical direction;

[0007] The furnace body is provided with an input port on the top and a accommodating chamber. The rotating chute extends into the accommodating chamber through the input port. The accommodating chamber is provided with multiple coke layers and ore layers from bottom to top. The coke layers and ore layers are arranged alternately, and the coke layer is at the bottom. Detection devices are provided on both sides of the furnace body.

[0008] In one embodiment of the present invention, the tilting angle of the rotary chute used for ore layer distribution is a first angle, and the tilting angle of the rotary chute used for coke layer distribution is a second angle, and the first angle and the second angle are not equal.

[0009] In one embodiment of the present invention, the first angle and the second angle are the angles between the axis of the rotating chute and the axis of the furnace body.

[0010] In one embodiment of the present invention, the first angle is smaller than the second angle.

[0011] In one embodiment of the present invention, the first angle is 0.5°-1° smaller than the second angle.

[0012] In one embodiment of the utility model, the furnace top equipment further includes a material tank weighing scale and a material flow valve, wherein the material tank weighing scale is used to detect material distribution quality, and the material flow valve is used to control material distribution speed.

[0013] In one embodiment of the present invention, the coke layer or ore layer passes through a rotary chute and adopts multi-ring distribution and / or spiral distribution.

[0014] In one embodiment of the utility model, each of the ore layer and the coke layer is conical or truncated cone-shaped in the containing cavity.

[0015] In one embodiment of the utility model, the diameter of the accommodating cavity gradually decreases from bottom to top, and a zero material line is arranged at the top of the accommodating cavity, and the height of the coke layer or the ore layer does not exceed the zero material line.

[0016] In one embodiment of the present invention, the rotary chute is provided with a plurality of tilting gears, so that the rotation range of the first angle and the second angle is between 10° and 60°.

[0017] The above technical solution of the utility model has the following advantages compared with the prior art:

[0018] The utility model discloses a blast furnace roof stable platform feeding device, the furnace roof equipment is located at the top of the blast furnace, and the bottom is equipped with a rotating chute, the output ends of the rotating motor and the tilting motor are respectively connected to the rotating chute, the rotating motor drives the rotating chute to rotate in a circle around the axis in the horizontal direction, so that the material can be evenly distributed to the plane in the accommodating cavity, and the rotating chute is driven by the tilting motor to rotate in the vertical direction, the bottom of the furnace roof equipment is provided with an output port connected to the input port, so as to adjust the angle and position of the material falling, cooperate with the rotating motor to carry out multi-ring and spiral feeding, realize the feeding of the coke layer and the ore layer at different tilting angles, the coke exists near the furnace wall, the impact force brought by the upper ore feeding can be eliminated or mitigated, the mixing area can be eliminated or reduced, the ore rolling no longer occurs frequently, thereby constructing a stable ore platform, and achieving the purpose of stabilizing the airflow at the edge of the blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein

[0020] Figure 1 It is a schematic diagram of the furnace mixing area in the prior art;

[0021] Figure 2 This is a schematic diagram of eliminating or reducing the mixing area of ​​the furnace body of the utility model;

[0022] Figure 3 This is a schematic diagram of the angle of the rotary chute of the utility model;

[0023] Figure 4 It is a structural schematic diagram of the furnace top equipment and furnace body of the utility model;

[0024] Figure 5 It is a structural schematic diagram of the furnace top equipment and the furnace body of the utility model from another angle.

[0025] Explanation of the reference numerals in the specification: 1. furnace body; 2. coke layer; 3. ore layer; 4. input port; 6. rotating chute; 7. furnace top equipment; 8. rotating motor; 9. tilting motor; 10. output port; 11. detection device. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0027] Example

[0028] Reference Figure 1-5As shown, a blast furnace top stabilizing platform material distribution device of the utility model comprises:

[0029] A furnace top device 7, the bottom of which is provided with a rotating chute 6, and a rotating motor 8 and a tilting motor 9 respectively connected to the rotating chute 6 at the output ends, wherein the rotating motor 8 is used to drive the rotating chute 6 to rotate in the horizontal direction, and the tilting motor 9 is used to drive the rotating chute 6 to rotate in the vertical direction;

[0030] The furnace body 1 is provided with an input port 4 on the top, and a accommodating chamber. The rotating chute 6 extends into the accommodating chamber through the input port 4. The accommodating chamber is provided with multiple layers of coke layers 2 and ore layers 3 from bottom to top. The coke layers 2 and ore layers 3 are arranged alternately, and the coke layer 2 is at the bottom. Detection devices 11 are provided on both sides of the furnace body 1.

[0031] The utility model describes a blast furnace roof stabilizing platform feeding device, wherein the furnace roof equipment 7 is located at the top of the blast furnace, and a rotating chute 6 is provided at the bottom thereof, the output ends of the rotating motor 8 and the tilting motor 9 are respectively connected to the rotating chute 6, the rotating motor 8 drives the rotating chute 6 to rotate in a circle around the axis in the horizontal direction, so that the material can be evenly distributed on the plane in the accommodating cavity, and the rotating chute 6 is driven by the tilting motor 9 to rotate in the vertical direction, the bottom of the furnace roof equipment 7 is provided with an output port 10 connected to the input port 4, so as to adjust the angle and position of the material falling, cooperate with the rotating motor 8 to carry out multi-ring and spiral feeding, and realize feeding of the coke layer 2 and the ore layer 3 at different tilting angles.

[0032] The tilting angle of the rotary chute 6 used for distributing the ore layer 3 is a first angle, and the tilting angle of the rotary chute 6 used for distributing the coke layer 2 is a second angle. The first angle and the second angle are not equal, so as to control the distribution point and distribution of the ore and coke, reduce the formation of mixed areas caused by improper distribution, and build a more stable blast furnace distribution platform, thereby optimizing the airflow distribution and reaction conditions inside the blast furnace, and ensuring the efficiency and stability of the blast furnace smelting process.

[0033] The first angle and the second angle are the angles between the axis of the rotating chute 6 and the axis of the furnace body 1 , and the maximum value of the angle is limited so that the material passing through the rotating chute 6 will not collide with the inner wall of the accommodating cavity, that is, the furnace wall in the furnace body 1 .

[0034] The first angle is smaller than the second angle. Specifically in this embodiment, the first angle is used for feeding the ore layer 3, and the second angle is used for feeding the coke layer 2. Since the density of the coke layer 2 is lower than that of the ore layer 3, the mass of the coke layer 2 is smaller than that of the ore layer 3 in the case of the same thickness of the feeding layer. Therefore, the ore layer 3 with a larger mass has a greater inertia during the feeding movement and can be thrown a longer distance. The rotating chute 6 is angle compensated by the tilting motor 9, so that when the rotating chute 6 feeds the coke at the second angle, its feeding angle is greater than the first angle when the ore is fed, so that the coke can also reach the periphery of the accommodating cavity when feeding, that is, the position near the furnace wall in the furnace body 1. After adopting this method, there is coke near the furnace wall, which can eliminate or reduce the impact force brought by the upper ore feeding, eliminate or reduce the mixing area, and the ore rolling no longer occurs frequently, thereby constructing a stable ore platform to achieve the purpose of stabilizing the airflow at the edge of the blast furnace.

[0035] The first angle is 0.5°-1° smaller than the second angle, so that the difference in the distribution angles of ore and coke is within a reasonable range, and both can be evenly distributed on the plane inside the furnace.

[0036] The furnace top equipment 7 also includes a tank weighing scale and a material flow valve. The tank weighing scale is used to detect the quality of material distribution, and the material flow valve is used to control the distribution speed. The tank weighing scale is used to detect the quality of material distribution and obtain the weight data of each distribution to provide data for subsequent distribution adjustment and optimization. The material flow valve is used to control the distribution speed and switch, that is, the adjustment of the material distribution speed from zero to the maximum. In combination with the obtained weight data, the distribution speed can be changed by adjusting the material flow valve, so as to better control the distribution of the charge in the furnace, cooperate with the setting of the distribution tilt angle, build a stable blast furnace ore distribution platform, and optimize the smelting process of the blast furnace.

[0037] The output end of the rotating motor 8 is connected to a tilting motor 9 , and the output end of the tilting motor 9 is connected to a rotating chute 6 , and the rotating chute 6 is rotatably connected to the furnace body 1 .

[0038] The coke layer 2 or ore layer 3 is distributed more evenly in the furnace by using a rotating chute 6 and / or a spiral distribution. In this embodiment, the coke layer 2 and the ore layer 3 are distributed more evenly in the furnace. The multi-ring distribution can be carried out at different circumferential positions, while the spiral distribution can achieve continuous distribution from the center to the edge or from the edge to the center. In this embodiment, the multi-ring distribution and the spiral distribution are carried out in coordination, and the radius of the furnace body 1 is divided into multiple ring positions, and the angle position or ring position of the distribution is selected from the edge to the center. Multiple ring positions are from the edge to the center, and the number of distribution rings is selected according to the distribution needs of the blast furnace to form a distribution matrix of ore and coke, and the coke angle is 44.5°-12° up and down; the ore angle is 44°-33° up and down.

[0039] Each layer of the ore layer 3 and the coke layer 2 is conical or truncated cone-shaped in the containing chamber. During the material distribution process, the material falls from the rotating chute 6 and gradually accumulates to form a cone or truncated cone. The material distribution situation in the furnace body 1 is detected by the detection device 11.

[0040] The diameter of the accommodating chamber gradually decreases from bottom to top, which is convenient for better controlling the distribution of materials in the furnace and the flow of airflow, and a zero-material line is arranged on the top of the accommodating chamber, which sets an upper limit for the stacking height of the coke layer 2 and the ore layer 3, maintains good contact and exchange between the gas and materials in the furnace, promotes the full progress of the reaction, and the accommodating chamber no longer narrows on the zero-material line, and the height of the coke layer 2 or the ore layer 3 does not exceed the zero-material line.

[0041] The rotating chute 6 is provided with a plurality of tilting gears, so that the rotation range of the first angle and the second angle is between 10°-60°. In the present embodiment, the rotating chute 6 is provided with 9 tilting gears through the tilting motor 9, namely, gear 1 α1=16°, gear 2 α2=26°, gear 3 α2=28°, gear 4 α4=30°, gear 5 α5=34°, gear 6 α6=37°, gear 7 α7=40.5°, gear 8 α8=43°, gear 9 α9=45.5°, so as to be suitable for ores of different specifications.

[0042] After adjustment, there is a platform on the coke layer 2 near the furnace wall, that is, where the ore falls, eliminating the unstable factor of the ore platform. After the method was put into use, the relevant experimental blast furnace conditions achieved long-term (more than 3 months) stable and smooth operation, the smelting intensity was effectively improved, the blast furnace effective utilization coefficient increased by 0.2, and the coke consumption decreased by more than 3kg / t, achieving the expected effect.

[0043] This embodiment also includes a method for constructing a blast furnace ore distribution platform, comprising the following steps:

[0044] Step 1: Calibrate various parameters of the blast furnace top charging equipment (including but not limited to the charging tank weighing scale, the opening of the charging valve, the tilting rotation angle α of the charging chute) to ensure the accuracy of the instrumentation data;

[0045] Step 2: Set the coke ore distribution angle α, and set the chute tilting angle α separately when distributing ore and coke, that is, the chute tilting angle α when distributing ore and coke is changed from consistent to inconsistent;

[0046] Step 3: The tilting angle of the ore distribution chute αore is smaller than the tilting angle of the coke distribution chute αcoke by 0.5-1°;

[0047] Step 4: Spread the fabric in a multi-ring + spiral manner.

[0048] As a further preferred solution, the method can appropriately adjust relevant parameters according to the different effective volumes of the blast furnace to achieve the purpose of meeting different furnace capacities and different furnace conditions.

[0049] Through the above steps, this embodiment has the following advantages: First, the process design is relatively advanced, making full use of existing equipment conditions, and can be implemented without adding new equipment. Second, this method is suitable for blast furnaces of various furnace capacities that adopt the bellless rotary chute 6 charging method, and can be implemented by adjusting parameters according to actual furnace conditions through this method. Third, the investment is low, the construction difficulty is small, and the maintenance cost is low.

[0050] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A blast furnace top stabilizing platform material distribution device, characterized in that: include: A furnace top device, the bottom of which is provided with a rotating chute, and a rotating motor and a tilting motor respectively connected to the rotating chute at the output ends, the rotating motor is used to drive the rotating chute to rotate in the horizontal direction, and the tilting motor is used to drive the rotating chute to rotate in the vertical direction; The furnace body is provided with an input port on the top and a accommodating chamber. The rotating chute extends into the accommodating chamber through the input port. The accommodating chamber is provided with multiple coke layers and ore layers from bottom to top. The coke layers and ore layers are arranged alternately, and the coke layer is at the bottom. Detection devices are provided on both sides of the furnace body.

2. A blast furnace roof stabilizing platform material distribution device according to claim 1, characterized in that: The tilting angle of the rotary chute used for distributing the ore layer is a first angle, and the tilting angle of the rotary chute used for distributing the coke layer is a second angle, and the first angle and the second angle are not equal.

3. A blast furnace roof stabilizing platform material distributing device according to claim 2, characterized in that: The first angle and the second angle are the angles between the axis of the rotating chute and the axis of the furnace body.

4. A blast furnace roof stabilizing platform material distribution device according to claim 2, characterized in that: The first angle is smaller than the second angle.

5. A blast furnace roof stabilizing platform material distributing device according to claim 4, characterized in that: The first angle is smaller than the second angle by 0.5°-1°.

6. A blast furnace top stabilizing platform material distribution device according to claim 1, characterized in that: The furnace top equipment also includes a material tank weighing scale and a material flow valve. The material tank weighing scale is used to detect the material distribution quality, and the material flow valve is used to control the material distribution speed.

7. The blast furnace top stabilizing platform material distributing device according to claim 1, characterized in that: The coke layer or ore layer passes through a rotating chute and adopts multi-ring distribution and / or spiral distribution.

8. The blast furnace top stabilizing platform material distributing device according to claim 1, characterized in that: Each ore layer and coke layer is in a cone or truncated cone shape in the containing cavity.

9. The blast furnace top stabilizing platform material distributing device according to claim 1, characterized in that: The diameter of the accommodating cavity decreases gradually from bottom to top, and a zero-material line is arranged at the top of the accommodating cavity, and the height of the coke layer or the ore layer does not exceed the zero-material line.

10. The blast furnace roof stabilizing platform material distributing device according to claim 2, characterized in that: The rotary chute is provided with a plurality of tilting gears, so that the rotation range of the first angle and the second angle is between 10° and 60°.

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