An alloy roasting and screening system for steelmaking and a roasting and screening method thereof

Abstract

The application discloses an alloy roasting and screening system for steelmaking and a roasting and screening method thereof, and relates to the technical field of alloy roasting and screening systems. The system comprises an alloy bin, a combustion chamber is arranged in communication with the outer wall of the alloy bin, an alloy burner is arranged at the top of the combustion chamber, the bottom surface of the combustion chamber is a first sieve plate, a first alloy powder recovery bin is arranged in communication with the bottom of the first sieve plate, a first material outlet is arranged in communication with the side surface of the combustion chamber, the screening feeder has a screening feeder body, a material receiving horn is arranged in communication with the upper portion of the screening feeder body, the material receiving horn is in communication with the first material outlet, the bottom of the screening feeder body is a second sieve plate, a second alloy powder recovery bin is arranged in communication with the bottom of the second sieve plate, an exciter is arranged on the outer wall of the second alloy powder recovery bin, the screening feeder body is provided with a second material outlet, and a chute is arranged in communication with the first alloy powder recovery bin and the second alloy powder recovery bin. The alloy roasting and screening system solves the problems of uneven roasting effect, poor discharging and dust flying of the existing alloy roasting device.

Description

[Technical Field]

[0001] This invention belongs to the technical field of alloy baking equipment, specifically relating to an alloy baking and screening system and its baking and screening method for steelmaking. [Background Technology]

[0002] In converter steelmaking, silicon-manganese and vanadium-nitrogen alloys are used for alloying. The amount of alloy added varies from several hundred kilograms to several tons depending on the steel grade. Ferroalloys at room temperature absorb a large amount of heat when added to molten steel at temperatures above 1600°C, causing the steel temperature to drop. To ensure the pourability of the molten steel, the converter must increase the tapping temperature. Increasing the tapping temperature reduces the lifespan of the converter refractory materials and increases refractory consumption. It also increases the post-blowing time in the converter, increasing the consumption of steel materials and oxygen. Furthermore, it increases the consumption of alloys and deoxidizers, negatively impacting steelmaking costs. In addition, damp alloys can cause accidents such as ladle overturning, billet bubbles, and excessive hydrogen content in the billet. Therefore, preheating the alloy before adding it to the ladle is an important measure in steelmaking, especially for steel grades that produce large quantities of alloy materials; the alloy preheating technology has a greater impact on product quality and cost.

[0003] Existing alloy baking equipment uses open-type baking, resulting in significant heat loss and high energy consumption. If the alloy pieces inside the chamber are of uneven size, the baking effect will be uneven, and the required baking temperature will be difficult to reach in a short time. Prolonged baking will cause small pieces and powdered alloy materials to sinter, leading to poor material discharge, affecting production, and ultimately resulting in substandard steel composition. At the same time, alloy dust flies around during the alloy discharge process, affecting the health of operators. [Summary of the Invention]

[0004] The purpose of this invention is to provide an alloy baking and screening system and its baking and screening method for steelmaking, so as to solve the problems of uneven baking effect, poor material discharge and dust in existing alloy baking devices.

[0005] This invention adopts the following technical solution: an alloy baking and screening system for steelmaking and its baking and screening method, comprising:

[0006] An alloy silo is a hollow barrel structure used to hold alloy materials.

[0007] A combustion chamber is connected to the outer wall of the alloy chamber. The top of the combustion chamber is equipped with an alloy burner for heating the alloy material. The bottom of the combustion chamber is a first sieve plate that is inclined downwards. The bottom of the first sieve plate is connected to a first alloy powder recovery chamber with an opening facing downwards. The side of the combustion chamber, above the first sieve plate, is connected to a first material outlet with an opening facing downwards.

[0008] A screening feeder has a screening feeder body horizontally positioned below a combustion chamber. A receiving horn is connected to the top of the screening feeder body and is connected to a first material outlet. A second screen plate is horizontally positioned at the bottom of the screening feeder body, and a second alloy powder recovery chamber is connected to the bottom of the second screen plate. A vibrator is installed on the outer wall of the second alloy powder recovery chamber. A second material outlet is located downwards at the end of the screening feeder body furthest from the receiving horn. The top of the screening feeder body is connected to the outer wall of the combustion chamber via four springs.

[0009] A tube is connected at its top to the first alloy powder recovery chamber and the second alloy powder recovery chamber, and its bottom is open for exporting the sieved powder.

[0010] Furthermore, a plurality of waist-shaped holes are arranged in an array on the first sieve plate and a plurality of waist-shaped holes are arranged in an array on the second sieve plate, wherein the axial direction of the waist-shaped holes on the first sieve plate is perpendicular to the axial direction of the waist-shaped holes on the second sieve plate.

[0011] Furthermore, it also includes a dust cover, which is used to cover the outside of the first alloy powder recovery bin, the second alloy powder recovery bin, the first material outlet, and the second material outlet.

[0012] Furthermore, a dust removal pipe is connected to the top of the dust cover.

[0013] Furthermore, the main body of the screening feeder is equipped with four hanging lugs, and a crossbeam extends outward from the combustion chamber;

[0014] The bottom of each spring is hooked to each lug by a hook. The tops of two springs are fixedly connected to the outer wall of the combustion chamber, and the tops of the other two springs are fixedly connected to the crossbeam.

[0015] Furthermore, it also includes an alloy burner located at the top of the combustion chamber, which is used to heat the alloy material inside the combustion chamber.

[0016] The second technical solution adopted in this invention is an alloy baking and screening system for steelmaking and a baking and screening method thereof, comprising the following:

[0017] After the alloy material is loaded into the alloy bin, it slides into the combustion chamber under the action of gravity;

[0018] Turn on the alloy burner to heat the material in the combustion chamber;

[0019] First screening: The vibrator is turned on again to generate vibration, so that the block material in the combustion chamber enters the screening feeder body through the first material outlet, and the powder material in the combustion chamber enters the first alloy powder recovery bin through the first screen plate.

[0020] Secondary screening: The material entering the screening feeder is vibrated by the vibrator, causing the lumpy material to be discharged through the second material outlet, and the powder material to pass through the second screen plate and enter the second alloy powder recovery bin.

[0021] Furthermore, the powder entering the first and second alloy powder recovery chambers is ultimately collected in a chute for recovery.

[0022] The beneficial effects of this invention are as follows: The invention employs an external baking and combustion chamber for the alloy storage, allowing for more complete combustion of the alloy in a short time, thus improving energy utilization efficiency. By adding a first sieve plate, a screening feeder, and a second sieve plate, the problem of alloy spillage and waste during transfer is solved, reducing production costs and improving economic efficiency. The dust cover and dust removal pipe reduce emissions of waste gas generated during complete energy combustion and toxic gases generated from incomplete combustion, reducing alloy dust generated during material discharge, lowering pollution levels, and minimizing the harm of dust to operators' health. During alloy transfer, small pieces and powdered alloys are easily spilled; the chute recovers the screened powder, solving the waste problem. [Attached Image Description]

[0023] Figure 1 This is a schematic diagram of the structure of an alloy baking and screening system and its baking and screening method for steelmaking according to the present invention.

[0024] Among them, 1. Alloy bin, 2. Alloy burner, 3. Dust cover, 4. Screening feeder body, 5. Combustion chamber, 6. Chute, 7. Dust removal pipe, 8. First screen plate, 9. Second screen plate, 10. Vibrator, 11. First alloy powder recovery bin, 12. Hanging lug, 13. First material outlet, 14. Second material outlet, 15. Second alloy powder recovery bin, 16. Receiving horn, 17. Spring, 18. Crossbeam.

Detailed Implementation Methods

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0026] This invention provides an alloy baking and screening system for steelmaking, such as... Figure 1 As shown, it includes an alloy bin 1, a combustion chamber 5, a screening feeder, and a chute 6.

[0027] The alloy chamber 1 is a hollow barrel structure used to hold alloy materials. A combustion chamber 5 is connected to the outer wall of the alloy chamber 1, and an alloy burner 2 is installed at the top of the combustion chamber 5 to heat the alloy materials inside. This invention employs external baking of the alloy chamber. The combustion chamber is designed according to the usage volume, changing from an open baking space to a relatively closed baking space, reducing the amount of alloy to be baked and thus reducing energy consumption while achieving the same baking effect. The bottom of the alloy chamber 1 is a steel structure reinforced by an internal sloping support. Therefore, the combustion chamber 5 is connected to the middle of the alloy chamber 1, and the outlet of the alloy chamber 1 into the combustion chamber 5 is the lowest point where the alloy materials are stored.

[0028] The bottom surface of the combustion chamber 5 is a downwardly inclined first sieve plate 8; the bottom of the first sieve plate 8 is connected to a downward-opening first alloy powder recovery chamber 11, and the side of the combustion chamber 5, located above the first sieve plate 8, is connected to a downward-opening first material outlet 13. This invention designs the dimensions of the combustion chamber according to actual needs, ensuring the amount of alloy added to the ladle each time meets the requirements, accommodating small-batch, high-frequency production with a fast production pace. Simultaneously, the combustion chamber can screen out the alloy powder in one pass, improving heating uniformity and enabling the alloy to reach the required temperature in a short time.

[0029] The screening feeder has a screening feeder body 4 horizontally positioned below the combustion chamber 5. A receiving horn 16 is connected to the top of the screening feeder body 4, and the receiving horn 16 is connected to the first material outlet 13. The bottom of the screening feeder body 4 is a horizontally positioned second screen plate 9, and the bottom of the second screen plate 9 is connected to a second alloy powder recovery chamber 15. A vibrator 10 is provided on the outer wall of the second alloy powder recovery chamber 15. A second material outlet 14 is provided downward at the end of the screening feeder body 4 away from the receiving horn 16. The top of the screening feeder body 4 is connected to the outer wall of the combustion chamber 5 by four springs 17.

[0030] The top of the chute 6 is connected to the first alloy powder recovery chamber 11 and the second alloy powder recovery chamber 15 respectively, and its bottom is open for exporting the sieved powder.

[0031] The first screen plate 8 is used to screen the alloy material in the combustion chamber 5 for the first time, the second screen plate 9 is used to screen the alloy material in the screening feeder body 4 for the second time, and the chute 6 is used to collect the powder material obtained by screening. This solves the problem of alloy spillage and waste during the transfer process, reduces production costs, and improves production economic efficiency. The second material outlet 14 is used to discharge the final block material. The block alloy material will be loaded into the transportation equipment and transferred to the use part for addition.

[0032] In some embodiments, a plurality of waist-shaped holes are arranged in an array on a first sieve plate, and a plurality of waist-shaped holes are arranged in an array on a second sieve plate. Each waist-shaped hole has the same size, which can be set to 10*30mm. The axial direction of the waist-shaped holes on the first sieve plate is perpendicular to the axial direction of the waist-shaped holes on the second sieve plate. Because the shape and size of the waist-shaped holes have a decisive influence on the screening accuracy, the perpendicular distribution of the axial direction of the waist-shaped holes on the first sieve plate to the axial direction of the waist-shaped holes on the second sieve plate can improve the screening rate of slender alloy particles smaller than 30mm.

[0033] In some embodiments, a dust cover 3 is further included, which is used to cover the outside of the first alloy powder recovery chamber 11, the second alloy powder recovery chamber 15, the first material outlet 13, and the second material outlet 14. By setting the dust cover 3, the problem of dust flying during the entire screening process is prevented. The flue gas dust removal section is open throughout the entire process, which recovers the exhaust gas generated during combustion in the combustion chamber and the alloy dust generated during the alloy material feeding process inside the dust removal hood.

[0034] In some embodiments, a dust removal pipe 7 is connected to the top of the dust cover 3. By adding a flue gas dust removal section, not only are the exhaust gases generated during the complete combustion of energy and the toxic gases generated during the incomplete combustion of energy recovered, but also the alloy dust generated during the feeding process of the alloy material is recovered, thereby reducing emission pollution and minimizing the harm of dust to human health.

[0035] In some embodiments, the screening feeder body 4 is provided with four lugs 12, and a crossbeam 18 extends outward from the combustion chamber 5; the bottom ends of each spring 7 are hooked onto each lug 12 via hooks, wherein the top ends of two springs 7 are fixedly connected to the outer wall of the combustion chamber 5, and the top ends of the other two springs 7 are fixedly connected to the crossbeam 18. The small-amplitude vibrations damped by the springs are transmitted to the combustion chamber, making it easier for the alloy material to slide off.

[0036] The present invention also provides a baking and screening method for an alloy baking and screening system for steelmaking, comprising the following:

[0037] After the alloy material is loaded into the alloy bin 1, it slides into the combustion chamber 5 under the action of gravity;

[0038] Turn on the alloy burner 2 to heat the material in the combustion chamber 5;

[0039] First screening: The vibrator 10 is turned on again to generate vibration, so that the block material in the combustion chamber 5 enters the screening feeder body 4 through the first material outlet 13, and the powder material in the combustion chamber 5 enters the first alloy powder recovery bin 11 through the first screen plate 8.

[0040] Secondary screening: The material entering the screening feeder is vibrated by the vibrator 10, causing the block material to be discharged through the second material outlet 14, and the powder material to enter the second alloy powder recovery bin 15 through the second screen plate 9.

[0041] The powder entering the first alloy powder recovery chamber 11 and the second alloy powder recovery chamber 15 is eventually collected by the chute 6.

[0042] This invention employs an external baking and combustion chamber for the alloy storage bin, enabling more complete combustion of the alloy in a short time and improving energy utilization efficiency. By adding a first sieve plate, a screening feeder, and a second sieve plate, the problem of alloy spillage and waste during transfer is solved, reducing production costs and improving economic efficiency. Dust covers and dust removal pipes reduce emissions of waste gas generated during complete energy combustion and toxic gases generated from incomplete combustion, reducing alloy dust generated during material discharge, lowering pollution levels, and minimizing the health risks to operators. During alloy transfer, small pieces and powder alloys are prone to spillage; the sieved powder is recovered via a chute, solving the waste problem.

Claims

1. An alloy baking and screening system for steelmaking, characterized in that, include: An alloy container (1) is a hollow barrel structure used to hold alloy materials; A combustion chamber (5) is connected to the outer wall of the alloy chamber (1). The top of the combustion chamber (5) is provided with an alloy burner (2) for heating alloy materials. The bottom surface of the combustion chamber (5) is a first sieve plate (8) that is inclined downward. The bottom of the first sieve plate (8) is connected to a first alloy powder recovery chamber (11) with an opening downward. The side of the combustion chamber (5) and above the first sieve plate (8) is connected to a first material outlet (13) with an opening downward. A screening feeder has a screening feeder body (4) horizontally disposed below the combustion chamber (5), the screening feeder body (4) is provided with four hanging ears (12), and a crossbeam (18) extends outward from the combustion chamber (5). The upper part of the screening feeder body (4) is connected to a receiving horn (16), which is connected to the first material outlet (13); the bottom of the screening feeder body (4) is a horizontally arranged second screen plate (9), the bottom of the second screen plate (9) is connected to a second alloy powder recovery chamber (15), and a vibrator (10) is provided on the outer wall of the second alloy powder recovery chamber (15); the end of the screening feeder body (4) away from the receiving horn (16) is provided with a downward-facing second material outlet (14); the upper part of the screening feeder body (4) is connected to the outer wall of the combustion chamber (5) by four springs (17); A tube (6) has its top end connected to the first alloy powder recovery chamber (11) and the second alloy powder recovery chamber (15), and its bottom end is open for exporting the sieved powder. The first sieve plate (8) is used to screen the alloy material in the combustion chamber (5) once, the second sieve plate (9) is used to screen the alloy material in the screening feeder body (4) twice, the chute (6) is used to collect the screened powder material, and the second material outlet (14) is used to discharge the final block material. It also includes a dust cover (3), which is used to cover the outside of the first alloy powder recovery chamber (11), the second alloy powder recovery chamber (15), the first material outlet (13) and the second material outlet (14); The top of the dust cover (3) is connected to a dust removal pipe (7).

2. The alloy baking and screening system for steelmaking as described in claim 1, characterized in that, The first sieve plate (8) is provided with a plurality of waist-shaped holes arranged in an array, and the second sieve plate (9) is provided with a plurality of waist-shaped holes arranged in an array. The axial direction of the waist-shaped holes on the first sieve plate (8) is perpendicular to the axial direction of the waist-shaped holes on the second sieve plate (9).

3. An alloy baking and screening system for steelmaking as described in claim 1 or 2, characterized in that, The bottom end of each spring (17) is hooked to each of the hanging ears (12) by a hook, wherein the top ends of two of the springs (17) are fixedly connected to the outer wall of the combustion chamber (5), and the top ends of the other two springs (17) are fixedly connected to the crossbeam (18).

4. A baking and screening method for an alloy baking and screening system used in steelmaking, characterized in that, An alloy baking and screening system for steelmaking, based on any one of claims 1-3, comprises the following: After the alloy material is loaded into the alloy bin (1), it slides into the combustion chamber (5) under the action of gravity; Turn on the alloy burner (2) to heat the material in the combustion chamber (5); First screening: The vibrator (10) is turned on again to generate vibration, so that the block material in the combustion chamber (5) enters the screening feeder body (4) through the first material outlet (13), and the powder material in the combustion chamber (5) enters the first alloy powder recovery bin (11) through the first screen plate (8). Secondary screening: The material entering the screening feeder is vibrated by the vibrator (10), causing the block material to be discharged through the second material outlet (14), and the powder material to pass through the second screen plate (9) and enter the second alloy powder recovery bin (15).

5. The baking and sieving method as described in claim 4, characterized in that, The powder entering the first alloy powder recovery chamber (11) and the second alloy powder recovery chamber (15) will eventually flow into the chute (6) for recovery.

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