Sintering fuel granularity sorting system and method

Abstract

The invention relates to a sintering fuel granularity sorting system and method.The system comprises a fluidized bed body, a weighing feeder, a porous fluidization plate, an air blower, a vibration motor, a cyclone separator, a bag-type dust collector, an induced draft fan and a diffusion chimney, the weighing feeder is arranged at one end of the fluidized bed body, and a finished product discharging port is formed in the other end of the fluidized bed body; a porous fluidizing plate is arranged in the fluidized bed body, air supplied by an air blower is arranged below the fluidized bed body, a dust collection cover for collecting dust removal air is arranged above the fluidized bed body, a dust collection pipeline is connected behind the dust collection cover, the dust collection pipeline is connected with a cyclone separator, and the cyclone separator is connected with a bag-type dust remover. According to the sintering fuel particle size sorting method, fuel with the too small particle size is sorted out, the situation that when the particle size of the fuel is too small, the combustion speed of the fuel in a sintering material layer is increased, and consequently the strength and the yield of sintered ore are affected is avoided, and the quality and the yield of the sintered ore can be greatly improved; the method has good commercial application value.

Description

Technical Field

[0001] This patent application belongs to the technical field of sintering equipment, and more specifically, relates to a sintering fuel particle size sorting system and method. Background Art

[0002] The average particle size of sintering fuel is commonly known as particle size. The existing technology only controls the crushing of larger pieces of coking coal, and there is no sorting technology for small particle fuel. When the crushing particle size is less than 3mm and accounts for more than 75%, it is considered a qualified product and proceeds to the downstream batching process. Small particle fuel (less than 0.5mm) can easily deteriorate the permeability of the sintering material layer and may be carried away by the airflow. At the same time, when the solid fuel particles are too fine, the sintering speed is fast, and the heat generated by the combustion makes it difficult for the sintering material to reach the required high temperature, thereby reducing the strength of the finished sintered ore, which in turn affects the quality and yield of the sintered ore and increases production costs.

[0003] Therefore, a technology is needed to sort out small particles (less than 0.5 mm) of sintered fuel to solve the above-mentioned problems existing in the prior art. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a sintering fuel particle size sorting system and method, which can sort out small particles (less than 0.5mm) of sintering fuel, increase the strength of the finished sintered ore, improve the yield of sintered ore, and reduce production costs.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is: A sintering fuel particle size sorting system comprises a fluidized bed body, a weighing feeder arranged at one end of the fluidized bed body, a finished product discharge port arranged at the other end of the fluidized bed body, an online detector installed at the outlet of the finished product discharge port, a porous fluidizing plate installed in the fluidized bed body, a vibrating motor installed in the fluidized bed body and located below the porous fluidizing plate, a blower for air supply arranged at the bottom below the fluidized bed body, a dust collecting hood arranged above the fluidized bed body for collecting air sent by the blower, a dust collecting duct connected to the upper end of the dust collecting hood, a cyclone separator connected to the dust collecting duct, a cyclone separator lower outlet arranged at the bottom of the cyclone separator, a bag dust collector connected to the upper end of the cyclone separator, a bag dust collector lower outlet arranged at the bottom of the bag dust collector, an induced draft fan connected to the bag dust collector, and a dispersion chimney connected to the other end of the induced draft fan, a plurality of air holes are arranged on the porous fluidizing plate, and the porous fluidizing plate corresponds to the finished product discharge port.

[0006] Furthermore, a dispersing blade shaft is provided at the outlet of the weigh feeder, and a plurality of dispersing blades are provided on the dispersing blade shaft, and a variable frequency motor is connected to the dispersing blade shaft, and the variable frequency motor is located outside the weigh feeder. The feed of the weigh feeder is dispersed by the dispersing blades and evenly spread on the porous fluidizing plate, and the speed of the dispersing blades is controlled by the variable frequency motor.

[0007] Furthermore, the blower delivers air to the bottom of the fluidized bed body through an air blast pipe, a flow regulating valve is installed on the air blast pipe, and the blast generated by the blower passes through the porous fluidizing plate from bottom to top.

[0008] Furthermore, a plurality of springs are installed at the bottom of the fluidized bed body, and the porous fluidizing plate is tiltedly arranged in the fluidized bed body.

[0009] Furthermore, there are multiple dust collecting hoods, and a pipe expansion joint is installed between the upper end of each dust collecting hood and the dust collection pipe.

[0010] Furthermore, the porous fluidizing plate is a special-shaped structure, comprising a substrate, a recessed portion arranged at one end of the substrate, and a convex portion arranged at the other end of the substrate, the recessed portion and the convex portion are located in the same horizontal plane, and the pores are located on the substrate.

[0011] A method for sintering fuel particle size sorting, using the above system, the process is as follows: S1. After the sintering fuel is crushed to less than 3mm, the feeding rhythm is controlled by the weighing feeder and spread on the porous fluidizing plate; S2, start the vibration motor, use the vibration motor to drive the porous fluidizing plate to vibrate, so that the fuel on the porous fluidizing plate moves to the finished product discharge port; S3, start the blower, and the blower 5 supplies cold air under the porous fluidizing plate. According to the fuel particle size feedback from the online detector at the finished product discharge port, the flow rate of the blower and the flow regulating valve is adjusted to form a raised air curtain mixed with fuel particles smaller than 0.5 mm above the porous fluidizing plate; S4. The air curtain mixed with fuel particles smaller than 0.5mm is sucked into the cyclone separator through the dust removal pipeline, among which the larger particles (greater than 0.005mm) of fuel are discharged from the lower outlet of the cyclone separator, and the smaller dust particles (less than or equal to 0.005mm) enter the bag dust collector through the pipeline above the cyclone separator for further dust removal and purification; all are smaller than 0.5mm, larger particles are larger than 0.005mm, and smaller particles are smaller.

[0012] S5. The treated and purified gas passes through the induced draft fan and is discharged into the atmosphere through the vent chimney.

[0013] Furthermore, in S1, a scattering blade with a variable frequency motor is used to evenly spread the fuel on the porous fluidizing plate.

[0014] Due to the adoption of the above technical solution, the beneficial effects achieved by the present invention are: The present invention sorts out small particles (less than 0.5 mm) of sintering fuel, thereby avoiding the problem that small particles of fuel (less than 0.5 mm) easily deteriorate the air permeability of the sintering material layer, and small particles of fuel are easily carried away by the airflow, causing fuel loss; at the same time, it avoids the problem that when the sintering solid fuel particles are too fine, the sintering speed is fast, and the heat generated by the combustion is difficult to make the sintering material reach the required high temperature, thereby reducing the strength of the finished sintered ore, thereby affecting the quality and yield of the sintered ore and increasing production costs. The sorting technology of the invention fills the technical gap of sorting small particles of sintering fuel (less than 0.5 mm), greatly improves the strength and yield of sintered ore, reduces production costs, and can be widely used in the field of sintering and other fuel particle sorting, with good commercial application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the sintering fuel particle size sorting system of the present invention; Figure 2 It is a schematic diagram of the structure of the scattering blade; Figure 3 It is a schematic diagram of the structure of a porous fluidized plate; The numbers in the figure are as follows: 1. Fluidized bed body; 2. Weighing feeder; 301. Frequency conversion motor; 302. Dispersing blade; 303. Dispersing blade shaft; 4. Porous fluidizing plate; 401. Air hole; 5. Blower; 6. Flow regulating valve; 7. Vibrating motor; 8. Spring; 9. Finished product discharge port; 10. Dust collecting hood; 11. Pipe expansion joint; 12. Dust suction duct; 13. Cyclone separator; 14. Lower outlet of cyclone separator; 15. Bag dust collector; 16. Lower outlet of bag dust collector; 17. Induced draft fan; 18. Dispersion chimney; 19. Online detector. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below with reference to the embodiments.

[0017] See also Figure 1The sintering fuel particle size sorting system of the present invention comprises a fluidized bed body 1, a weighing feeder 2 is provided at one end of the fluidized bed body 1, a finished product discharge port 9 is provided at the other end of the fluidized bed body 1, an online detector 19 is installed at the outlet position of the discharge port 9, a porous fluidizing plate 4 is installed in the fluidized bed body 1, a vibration motor 7 is installed in the fluidized bed body 1 below the porous fluidizing plate 4, a blower 5 for supplying air is provided at the bottom below the fluidized bed body 1, air is supplied through the blower 5 below the fluidized bed body 1, a dust collecting hood 10 for extracting air sent by the blower 5 is provided above the fluidized bed body 1, a dust collecting hood 10 is connected to a dust collecting duct 12 at the upper end, a cyclone separator 13 is connected to the dust collecting duct 12, a cyclone separator lower outlet 14 is provided at the bottom of the cyclone separator 13, a bag dust collector 15 is connected to the upper end 13 of the cyclone separator, and a bag dust collector lower outlet 16 is provided at the bottom of the bag dust collector 15. The bag filter 15 is connected to an induced draft fan 17 , and the other end of the induced draft fan 17 is connected to a dispersing chimney 18 .

[0018] The porous fluidizing plate 4 is provided with a plurality of air holes 401 . The porous fluidizing plate 4 corresponds to the finished product discharge port 9 . The porous fluidizing plate 4 can be tiltedly arranged in the fluidized bed body 1 .

[0019] exist Figure 2 In the figure, a scattering blade shaft 303 is provided at the outlet of the weigh feeder 2, and a plurality of scattering blades 302 are provided on the scattering blade shaft 303. The scattering blade shaft 303 is connected to a variable frequency motor 301, and the variable frequency motor 301 is located outside the weigh feeder 2.

[0020] The weighing feeder 2 feeds the sintered fuel through the scattering blade 302, and spreads it evenly on the porous fluidizing plate 4. The scattering blade 302 is welded to the scattering blade shaft 303. The installation angle of the scattering blade 302 is such that the angle between the scattering blade 302 and the horizontal direction is zero. The speed of the scattering blade 302 is driven by the variable frequency motor 301, and the speed of the variable frequency motor 301 can be adjusted in time according to changes in production conditions.

[0021] The blower 5 sends blast air to the bottom of the fluidized bed body 1 through an air blast pipe, on which a flow regulating valve 6 is installed. The blast air generated by the blower 5 passes through the porous fluidizing plate 4 with air holes 401 from bottom to top. The air volume of the blower 5 and the opening of the flow regulating valve 6 are adjusted according to the particle size detected by the online detector 19 to achieve a particle size greater than or equal to 0.5 mm at the finished product outlet 9.

[0022] The vibrating motor 7 is used to drive the vibrating fluidized bed to vibrate up and down, and the vibration makes the fuel particles reach a fluidized state. The cold air is blown in by the blower 5 to bring the fuel with a particle size less than 0.5 mm to the cyclone separator 13 through the dust collecting hood 10 and the dust suction duct. The cyclone separator 13 swirls the fuel with larger particles (greater than 0.005 mm) and discharges it at the lower outlet 14 of the cyclone separator. The discharged fuel is supplied to the blast furnace coal injection process.

[0023] A plurality of springs 8 are installed at the bottom of the fluidized bed body 1 to play a buffering role. There are multiple dust collecting hoods 10. Figure 1 There are two of them, and a pipe expansion joint 11 is installed between the upper end of each dust collecting hood 10 and the dust collection pipe 12. The pipe expansion joint 11 can effectively offset the overall vibration caused by the vibration motor 7 and increase the service life of the pipe.

[0024] exist Figure 3 In the figure, the porous fluidizing plate 4 is a special-shaped structure, which includes a substrate, a concave portion arranged at one end of the substrate, and a convex portion arranged at the other end of the substrate. The concave portion and the convex portion are located in the same horizontal plane, and the air holes 401 are located on the substrate. Figure 3 It can be clearly seen that there is an acute-angled convex portion on the left side of the upper part of the substrate and an acute-angled concave portion at the corresponding position on the right side, and there is an obtuse-angled concave portion on the left side of the lower part of the substrate and an obtuse-angled convex portion at the corresponding position on the right side.

[0025] The fuel ash of tiny particles (less than or equal to 0.005mm) enters the bag filter 15 through the upper opening of the cyclone separator 13, and the generated dust is discharged through the lower outlet 16 of the bag filter and supplied to the blast furnace coal injection. The treated and purified gas passes through the induced draft fan 17 and is discharged into the atmosphere through the discharge chimney 18.

[0026] In addition, the present invention also discloses a sintering fuel particle size sorting method, the process is: S1. The sintered fuel that is crushed to a size less than 3 mm is fed through a weighing feeder 2 to control the feeding rhythm and spread on the porous fluidizing plate 4. Preferably, the fuel is spread evenly on the porous fluidizing plate 4.

[0027] S2, start the vibration motor 7, and use the vibration motor 7 to drive the porous fluidizing plate 4 to vibrate, so that the fuel on the porous fluidizing plate 4 moves to the finished product discharge port 9.

[0028] S3, start the blower 5, and there is cold air supplied by the blower 5 under the porous fluidizing plate 4. The flow rate of the blower 5 is adjusted according to the fuel particle size feedback from the online detector 19 at the finished product discharge port 9, so as to form a raised air curtain mixed with fuel particles smaller than 0.5 mm above the porous fluidizing plate 4.

[0029] S4. The air curtain mixed with fuel particles smaller than 0.5 mm is sucked into the cyclone separator 13 through the dust removal pipe 12, wherein the fuel with a particle size larger than 0.005 mm is discharged from the lower outlet 14 of the cyclone separator, and the dust with a particle size less than or equal to 0.005 mm enters the bag dust collector 15 through the pipe above the cyclone separator 13 for further dust removal and purification.

[0030] S5. The treated and purified gas passes through the induced draft fan 17 and is discharged into the atmosphere through the vent chimney 18.

[0031] The system of the present invention controls the feeding rhythm of the crushed sintered fuel with a size less than 3 mm through a weighing feeder 2, and evenly spreads the material on the porous fluidizing plate 4 using a scattering blade 302 with a variable frequency motor 301, and drives the porous fluidizing plate 4 to vibrate using a vibration motor 7, so that the fuel on the porous fluidizing plate 4 moves to the finished product discharge port 9. There is a blower 5 under the porous fluidizing plate 4 to supply cold air, and the blower 5 and the flow regulating valve 6 are adjusted according to the fuel particle size feedback from the online detector 19 at the finished product discharge port 9. The flow rate is such that an air curtain mixed with fuel particles smaller than 0.5 mm is formed above the porous fluidizing plate 4, and the air curtain mixed with fuel particles smaller than 0.5 mm is sucked into the cyclone separator 13 through the dust removal pipe 12, wherein the larger particles are discharged from the lower outlet 14 of the cyclone separator, and the smaller dust particles enter the bag filter 15 through the pipe above the cyclone separator 13 for further dust removal and purification, and the treated and purified gas passes through the induced draft fan 17 and is discharged into the atmosphere through the emission chimney 18.

[0032] The method of the present invention sorts out small particles (less than 0.5 mm) of sintering fuel, thereby avoiding the problem that small particles of fuel (less than 0.5 mm) easily deteriorate the air permeability of the sintering material layer, and small particles of fuel are easily carried away by the airflow, causing fuel loss; at the same time, it avoids the problem that when the sintering solid fuel particles are too fine, the sintering speed is fast, and the heat generated by the combustion is difficult to make the sintering material reach the required high temperature, thereby reducing the strength of the finished sintered ore, thereby affecting the yield. The sintering fuel sorting technology of the invention fills the technical gap in the sorting of small particles (less than 0.5 mm) of sintering fuel, greatly improves the strength and yield of sintered ore, reduces production costs, and can be widely used in the field of sintering and other fuel particle sorting, with good commercial application value.

Claims

1. A sintering fuel particle size sorting system, characterized by: The invention comprises a fluidized bed body (1), a weighing feeder (2) arranged at one end of the fluidized bed body (1), a finished product discharge port (9) arranged at the other end of the fluidized bed body (1), an online detector (19) installed at the outlet of the finished product discharge port (9), a porous fluidizing plate (4) installed in the fluidized bed body (1), a vibration motor (7) installed in the fluidized bed body (1) and located below the porous fluidizing plate (4), a blower (5) arranged at the bottom below the fluidized bed body (1), a dust collecting hood (10) arranged above the fluidized bed body (1) and used to collect wind sent by the blower (5), and a dust collecting hood (11) arranged above the fluidized bed body (1) and used to collect wind sent by the blower (5). 10) a dust collection duct (12) connected to the upper end thereof, a cyclone separator (13) connected to the dust collection duct (12), a cyclone separator lower outlet (14) arranged at the bottom of the cyclone separator (13), a bag dust collector (15) connected to the upper end of the cyclone separator (13), a bag dust collector lower outlet (16) arranged at the bottom of the bag dust collector (15), an induced draft fan (17) connected to the bag dust collector (15), and a dispersing chimney (18) connected to the other end of the induced draft fan (17), a plurality of air holes (401) being provided on the porous fluidizing plate (4), and the porous fluidizing plate (4) corresponds to the finished product discharge port (9).

2. A sintering fuel particle size sorting system according to claim 1, characterized in that: A scattering blade shaft (303) is provided at the outlet of the weighing feeder (2), a plurality of scattering blades (302) are provided on the scattering blade shaft (303), and a variable frequency motor (301) is connected to the scattering blade shaft (303), and the variable frequency motor (301) is located outside the weighing feeder (2).

3. A sintering fuel particle size sorting system according to claim 1, characterized in that: The blower (5) delivers air to the bottom of the fluidized bed body (1) through an air blast pipe, and a flow regulating valve (6) is installed on the air blast pipe. The blast air generated by the blower (5) passes through the porous fluidizing plate (4) from bottom to top.

4. A sintering fuel particle size sorting system according to claim 1, characterized in that: A plurality of springs (8) are installed at the bottom of the fluidized bed body (1), and the porous fluidizing plate (4) is arranged obliquely in the fluidized bed body (1).

5. The sintering fuel particle size sorting system according to claim 1, characterized in that: There are a plurality of dust collecting hoods (10), and a pipe expansion joint (11) is installed between the upper end of each dust collecting hood (10) and the dust collection pipe (12).

6. A sintering fuel particle size sorting system according to claim 1, characterized in that: The porous fluidizing plate (4) comprises a substrate, a concave portion arranged at one end of the substrate, and a convex portion arranged at the other end of the substrate, wherein the concave portion and the convex portion are located on the same horizontal plane, and the pores (401) are located on the substrate.

7. A method for sintering fuel particle size sorting, using the system according to any one of claims 1 to 6, characterized in that The process is: S1, the sintered fuel is crushed to a size less than 3 mm, and the feed is fed through a weighing feeder (2) to control the feeding rhythm, and is spread on a porous fluidizing plate (4); S2, starting the vibration motor (7), using the vibration motor (7) to drive the porous fluidizing plate (4) to vibrate, so that the fuel on the porous fluidizing plate (4) moves toward the finished product discharge port (9); S3, starting the blower (5), supplying cold air from the blower 5 below the porous fluidizing plate (4), adjusting the flow rate of the blower (5) based on the fuel particle size feedback from the online detector (19) at the finished product discharge port (9), so as to form a raised air curtain containing fuel particles smaller than 0.5 mm above the porous fluidizing plate (4); S4, sucking the air curtain mixed with fuel particles smaller than 0.5 mm into the cyclone separator (13) through the dust removal duct (12), wherein the fuel with a particle size larger than 0.005 mm is discharged from the lower outlet (14) of the cyclone separator, and the dust with a particle size smaller than or equal to 0.005 mm enters the bag filter (15) through the upper duct of the cyclone separator (13) for further dust removal and purification; S5. The treated and purified gas passes through the induced draft fan (17) and is discharged into the atmosphere through the discharge chimney (18).

8. A sintering fuel particle size sorting method according to claim 7, characterized in that: In S1, the fuel is evenly spread on the porous fluidizing plate (4).

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