Smoke dust treatment equipment and treatment method based on steel slag air quenching granulation

Abstract

The invention discloses smoke dust treatment equipment and method based on steel slag air quenching granulation, and the equipment comprises an air duct which is transversely arranged and is used for flue gas to pass through; the dust removal cylinder is sleeved outside the air cylinder; the plurality of separation holes are formed in the top of the side wall of the air cylinder, so that the air cylinder is communicated with the dust removal cylinder; wherein a magnetic block is arranged in the upper half part of the dust removal barrel, and flue gas flows into the air barrel in the tangential direction and rotates and blows in the air barrel. Flue gas generated by driving of high-speed air flow in a steel slag air quenching method flows into the air barrel in the tangential direction, the air flow in the air barrel rotates and blows, so that fine solid particles in the flue gas move into the dust removal barrel from the air barrel through the separation holes under the centrifugal effect, and iron oxide is magnetically attracted to the upper half portion of the dust removal barrel through the magnetic blocks; and other substances cannot be magnetically absorbed at the lower half part of the dust removal cylinder, so that recoverable iron oxide and acid salt substances in the generated flue gas are continuously separated.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas and dust separation, and particularly to a steel slag air-quenching granulation dust treatment device and a treatment method thereof. Background Art

[0002] Steel slag is a by-product during the steelmaking process to remove impurities in steel. The mainstream process for steel slag treatment in China is the air-quenching method, also known as the air-quenching granulation method. Since the gravitational force between steel slag molecules is small at high temperatures in a liquid state, they can be separated from each other with relatively little energy. High-speed air currents are used to quickly break the falling high-temperature liquid steel slag stream into fine droplets in the air, and the droplets fly in a specific direction with the air current. During the flight, they are quickly cooled into semi-solid slag particles, and then dispersed and fall into a pool, where they are quickly cooled to room temperature. This method has a simple process, a small footprint, a large processing capacity, thorough granulation, and low air consumption. The process of air-quenching treatment is as follows: After the slag is received by the slag pot under the electric furnace hearth, it is transported to the air-quenching device, the slag pot is tilted, and the molten slag flows out through the intermediate tank and is dispersed by the air ejected from a special nozzle, breaking into fine particles. The high-temperature air and the heat dissipated from the fine particle slag are recovered in a covered boiler, and the slag particles are captured. However, a small amount of flue gas is generated during the steel slag treatment process. The main components of the flue gas mainly contain fine solid particles, such as iron oxides 、silicates, aluminates, etc. The particle size is mostly between 0.1 and 100 microns. It is urgent to separate the recoverable iron oxides and acid salts in the generated flue gas. Summary of the Invention

[0003] The purpose of the present invention is to provide a steel slag air-quenching granulation dust treatment device and a treatment method thereof to continuously separate the recoverable iron oxides and acid salts in the generated flue gas.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A steel slag air-quenching granulation dust treatment device includes:

[0006] An air duct, horizontally arranged for the passage of flue gas;

[0007] A dust removal cylinder, sleeved outside the air duct;

[0008] A plurality of separation holes are arranged at the top of the side wall of the air duct to connect the air duct and the dust removal cylinder;

[0009] A cover body;

[0010] A clear door is opened on one side of the cover body;

[0011] A collection pool is arranged below the cover body;

[0012] A rotating shaft is rotatably connected and arranged inside the cover body;

[0013] Multiple fan blades, fixedly connected to the outer wall of the rotating shaft;

[0014] The first propeller blade, fixedly arranged on the outer wall of the rotating shaft;

[0015] The second propeller blade, located between the air duct and the dust removal cylinder, and adapted to fit with the dust removal cylinder and the air duct;

[0016] Two discharge hoppers, respectively corresponding to discharging recyclable iron oxides and acid salts;

[0017] Among them, the upper half of the dust removal cylinder contains magnetic blocks. The high-speed air flow of the steel slag air quenching method enters the inside of the cover through the open door. The high-speed air flow quickly breaks the flowing stream of high-temperature liquid steel slag falling in the air into small droplets, and flies in a directed manner along with the air flow. During the flight, it is quickly cooled into semi-solid slag particles, and then scattered into the collection pool. The generated flue gas rushes into the inside of the air duct in a tangential direction and rotates and blows inside the air duct.

[0018] Preferably, the open door corresponds to the direction of the high-speed air flow in the steel slag air quenching method. The collection pool is used to collect the scattered semi-solid slag particles, and the dust removal cylinder is fixedly arranged at the inner top of the cover.

[0019] Preferably, the air duct is located inside the dust removal cylinder and is rotationally connected coaxially with the dust removal cylinder. One end of the air duct is rotationally connected to the cover. The dust removal cylinder is provided with an air inlet. The cover is rotationally connected with a rotating shaft, and the rotating shaft is located inside the air duct and is coaxially arranged with the air duct.

[0020] Preferably, the rotating shaft is fixedly connected with a rotating ring through the fan blade, the outer wall of the rotating ring is in fit with the inner wall of the dust removal cylinder, and the edge of the first propeller blade is fixedly connected in adaptation with the air duct.

[0021] Preferably, a plurality of counterweight plates are also slidably arranged inside the air duct, and the sliding direction of the counterweight plates is perpendicular to the virtual central axis of the rotating shaft.

[0022] Preferably, the cover is also fixedly connected with two conveying pipelines, and the two conveying pipelines are respectively communicated with the two discharge hoppers.

[0023] A method for treating steel slag air quenching granulation smoke and dust, comprising the following steps:

[0024] Guide the generated flue gas to enter the air duct in a tangential direction under the high-speed air flow and form a rotating air flow inside the air duct;

[0025] The rotating air flow enables the fine solid particles in the flue gas to enter the dust removal cylinder under the action of centrifugal force;

[0026] Enter the dust removal cylinder and classify the fine solid particles according to magnetic attraction and be respectively located in the upper half and the lower half of the dust removal cylinder;

[0027] The rotating airflow drives the rotation of the air duct, the first propeller blade and the second propeller blade, and pushes the fine solid particles in the dust removal cylinder to separate from it.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] In the present invention, by using the flue gas generated by the high-speed airflow in the steel slag air quenching method to flow into the interior of the air duct in a tangential direction, the air flow inside the air duct rotates and blows, so that the fine solid particles in the flue gas move from the air duct to the interior of the dust removal cylinder through a plurality of separation holes under the action of centrifugal force, and the iron oxide is magnetically attracted by the magnetic block and located in the upper half of the dust removal cylinder, and the remaining substances that cannot be magnetically attracted remain in the lower half of the dust removal cylinder, continuously separating the recoverable iron oxide and acid salt substances in the generated flue gas. Description of the drawings

[0030] Figure 1 FIG. is a schematic structural diagram of a steel slag air quenching granulation soot treatment device proposed by the present invention;

[0031] Figure 2 FIG. is a schematic internal structure diagram of a steel slag air quenching granulation soot treatment device proposed by the present invention;

[0032] Figure 3 FIG. is a schematic internal structure diagram of the air duct and the dust removal cylinder in a steel slag air quenching granulation soot treatment device proposed by the present invention.

[0033] In the figure: 1. Air duct; 2. Dust removal cylinder; 3. Separation hole; 4. Cover body; 5. Clear door; 6. Collection pool; 7. Rotating shaft; 8. Fan blade; 9. Rotating ring; 10. First propeller blade; 11. Second propeller blade; 12. Counterweight plate; 13. Conveying pipeline; 14. Feeding hopper; 15. Air inlet. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Refer to the attached Figure 1 - attached Figure 3 , a steel slag air quenching granulation soot treatment device, comprising:

[0036] An air duct 1, which is horizontally arranged for the passage of flue gas;

[0037] A dust removal cylinder 2, which is sleeved outside the air duct 1;

[0038] A plurality of separation holes 3 are arranged and opened at the top of the side wall of the air duct 1, so that the air duct 1 is communicated with the dust removal cylinder 2;

[0039] Among them, the upper half of the dust removal cylinder 2 contains magnetic blocks, and the flue gas rushes into the inside of the air duct 1 in a tangential direction and rotates and blows inside the air duct 1.

[0040] Through the above technical solution, the flue gas generated by the high-speed air flow in the steel slag air quenching method rushes into the inside of the air duct 1 in a tangential direction. Then, the air flow rotation and blowing inside the air duct 1 cause the fine solid particles in the flue gas to move from the air duct 1 to the inside of the dust removal cylinder 2 through the plurality of separation holes 3 under the action of centrifugal force, and the iron oxide is magnetically attracted by the magnetic block and located in the upper half of the dust removal cylinder 2, and the remaining substances that cannot be magnetically attracted remain in the lower half of the dust removal cylinder 2, continuously separating the recoverable iron oxide and acid salt substances in the generated flue gas.

[0041] The dust treatment equipment further includes a cover body 4. The cover body 4 has an open door 5. The open door 5 corresponds to the direction of the high-speed air flow in the steel slag air quenching method. A collection pool 6 is arranged below the cover body 4 for collecting scattered semi-solid slag particles. The dust removal cylinder 2 is fixedly arranged at the inner top of the cover body 4.

[0042] The air duct 1 is located inside the dust removal cylinder 2 and is rotationally connected coaxially with the dust removal cylinder 2. One end of the air duct 1 is rotationally connected to the cover body 4. The dust removal cylinder 2 is provided with an air inlet 15. The cover body 4 is rotationally connected with a rotating shaft 7. The rotating shaft 7 is located inside the air duct 1 and is coaxially arranged with the air duct 1.

[0043] A plurality of fan blades 8 are fixedly connected to the outer wall of the rotating shaft 7. The rotating shaft 7 is fixedly connected with a rotating ring 9 through the fan blades 8. The outer wall of the rotating ring 9 is fitted with the inner wall of the dust removal cylinder 2. A first propeller blade 10 is also fixedly arranged on the outer wall of the rotating shaft 7. The edge of the first propeller blade 10 is fixedly connected in a matching manner with the air duct 1. The rotating ring 9 is fixedly provided with a second propeller blade 11. The second propeller blade 11 is located between the dust removal cylinder 2 and the air duct 1 and is fitted and attached to the dust removal cylinder 2 and the air duct 1.

[0044] Through the above technical solution, the high-speed air flow enters through the air inlet 15 and blows the fan blades 8 to make the conversion and the rotating shaft 7 rotate synchronously, driving the rotation of the first propeller blade 10 and the second propeller blade 11. The air flow entering the air duct 1 rotates and flows in a spiral form under the guidance of the first propeller blade 10, maintaining the centrifugal action on the fine solid particles in the flue gas, which helps the fine solid particles to be more thoroughly separated and enter the inside of the dust removal cylinder 2 through the separation holes 3. The rotation of the second propeller blade 11 pushes the fine solid particles located in the dust removal cylinder 2, enabling the dust removal cylinder 2 to continuously remove dust and avoid accumulation.

[0045] A plurality of counterweight plates 12 are also slidably arranged inside the air duct 1. The sliding direction of the counterweight plates 12 is perpendicular to the virtual central axis of the rotating shaft 7.

[0046] Through the above technical solution, when the counterweight plate 12 is in the lower part of the dust collecting cylinder 2, it will collide with the inner wall of the dust collecting cylinder 2 under the action of gravity, and then the fine solid particles in the lower part of the dust collecting cylinder 2 will be pushed to the upper part of the dust collecting cylinder 2 according to the rotation of the wind tube 1. If the fine solid particles contain iron oxides , can be magnetically attracted and retained by the upper part of the dust removal cylinder 2.

[0047] The cover body 4 is also fixedly connected to two conveying pipes 13 , and the two conveying pipes 13 are respectively connected to two lower hoppers 14 .

[0048] Working principle:

[0049] The high-speed airflow of the slag wind quenching method enters the housing 4 through the open door 5, and the high-speed airflow quickly breaks the falling high-temperature liquid slag into fine droplets in the air, and the droplets fly in a directional manner with the airflow, and are quickly cooled into semi-solid slag particles during the flight, and then dispersed and fall into the collection pool 6;

[0050] The generated flue gas enters the wind tube 1 under the influence of high-speed airflow, pushing the fan blades 8 to rotate the shaft 7 and the wind tube 1, thereby causing the first propeller blade 10 and the second propeller blade 11 to rotate synchronously. Under the centrifugal effect, the fine solid particles in the flue gas pass through the separation hole 3 from the wind tube 1 into the dust removal tube 2, and the iron oxides are removed. The remaining fine solid particles are magnetically attracted by the upper part of the dust collecting cylinder 2, and fall into the lower part of the dust collecting cylinder 2, and are continuously pushed away from the dust collecting cylinder 2 by the second propeller blade 11;

[0051] The fine solid particles separated from the upper and lower parts of the dust removal cylinder 2 fall into the two conveying pipes 13 respectively, and are blown by the high-speed airflow blown out from the wind tube 1, and finally fall from the lower hopper 14.

[0052] It should be noted that:

[0053] The cover body 4 has two arc grooves at one end corresponding to the dust collecting tube 2 for discharging fine solid particles, which are used to transport fine solid particles in the upper and lower parts of the dust collecting tube 2, and the upper and lower arc grooves also correspond to two transport pipes 13 respectively.

[0054] Reference Figure 2 With the push of the second propeller blade 11, the magnetically attracted recyclable iron oxides in the upper part of the dust collecting tube 2 will move from the magnetic attraction area of ​​the dust collecting tube 2 to the arc-shaped groove magnetic attraction attenuation area corresponding to the cover body 4 and the upper part of the dust collecting tube 2. As the recyclable iron oxides accumulate in the arc-shaped groove magnetic attraction attenuation area, they gradually enter the corresponding conveying pipe 13, completing the removal of the recyclable iron oxides originally magnetically attracted in the dust collecting tube 2.

[0055] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A steel slag air-quenching granulation soot treatment device, characterized in that, Comprising: A wind tube (1), arranged horizontally for the passage of flue gas; A dust removal tube (2), sleeved outside the wind tube (1); A plurality of separation holes (3), arranged and opened at the top of the side wall of the wind tube (1) to connect the wind tube (1) and the dust removal tube (2); A cover body (4); A clear door (5), opened on one side of the cover body (4); A collection pool (6), arranged below the cover body (4); A rotating shaft (7), rotatably connected and arranged inside the cover body (4); A plurality of fan blades (8), fixedly connected to the outer wall of the rotating shaft (7); A first propeller blade (10), fixedly arranged on the outer wall of the rotating shaft (7); A second propeller blade (11), located between the wind tube (1) and the dust removal tube (2), and adapted to fit closely with the dust removal tube (2) and the wind tube (1); Two discharge hoppers (14), respectively corresponding to discharging recyclable iron oxides and acid salts; Among them, the upper half of the dust removal tube (2) contains magnetic blocks. The high-speed air flow of the steel slag air quenching method enters the inside of the cover body (4) through the clear door (5). The high-speed air flow quickly shatters the falling high-temperature liquid steel slag stream into fine droplets in the air, and the droplets fly in a directed manner with the air flow and are quickly cooled into semi-solid slag particles during the flight, and then are scattered and fall into the collection pool (6). The generated flue gas surges into the inside of the wind tube (1) in a tangential direction and rotates and blows inside the wind tube (1).

2. The apparatus for treating steel slag air-quenched granulation soot according to claim 1, wherein The clear door (5) corresponds to the direction of the high-speed air flow in the steel slag air quenching method. The collection pool (6) is used to collect the scattered semi-solid slag particles. The dust removal tube (2) is fixedly arranged at the inner top of the cover body (4).

3. The device for treating steel slag air-quenched granulation soot according to claim 1, wherein The wind tube (1) is located inside the dust removal tube (2) and is rotatably connected coaxially with the dust removal tube (2). One end of the wind tube (1) is rotatably connected to the cover body (4). The dust removal tube (2) is provided with an air inlet (15). The cover body (4) is rotatably connected with a rotating shaft (7). The rotating shaft (7) is located inside the wind tube (1) and is arranged coaxially with the wind tube (1).

4. The apparatus for treating steel slag air-quenched granulation soot according to claim 3, characterized in that, The rotating shaft (7) is fixedly connected with a rotating ring (9) through the fan blades (8). The outer wall of the rotating ring (9) fits with the inner wall of the dust removal tube (2). The edge of the first propeller blade (10) is fixedly connected in an adapted manner with the wind tube (1).

5. A steel slag air-quenching granulation soot treatment device according to claim 3, characterized in that, A plurality of counterweight plates (12) are also slidably arranged inside the wind tube (1). The sliding direction of the counterweight plates (12) is perpendicular to the virtual central axis of the rotating shaft (7).

6. The apparatus for treating steel slag air-quenched granulation soot according to claim 2, wherein, The cover body (4) is also fixedly connected with two conveying pipes (13). The two conveying pipes (13) are respectively communicated with the two discharge hoppers (14).

7. A method for treating steel slag air-quenched granulation soot, characterized in that, Including the following steps: Guiding the generated flue gas to enter the wind tube (1) in a tangential direction under the high-speed air flow to form a rotating air flow inside the wind tube (1); The rotating air flow enables the fine solid particles in the flue gas to enter the dust removal tube (2) under the centrifugal force; Entering the dust removal tube (2), the fine solid particles are classified according to the magnetic attraction and are respectively located in the upper half and the lower half of the dust removal tube (2); The rotating air flow promotes the rotation of the wind tube (1), the first propeller blade (10) and the second propeller blade (11), and promotes the fine solid particles inside the dust removal tube (2) to break away.

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