A sintering fuel sorting device and screening control method

Abstract

This invention discloses a sintering fuel sorting device, relating to the field of bulk fuel sorting technology. It includes a mechanical primary screening and feeding mechanism, a dust guiding and removal mechanism, and an airflow secondary screening mechanism. The airflow secondary screening mechanism has an annular air separation chamber, and an annular gas-solid interaction chamber is interconnected with the annular air separation chamber. A dust outlet is provided on the outer wall of the annular gas-solid interaction chamber. The airflow secondary screening mechanism includes a guide shroud and an air intake inner cylinder. The guide shroud is located outside the air intake inner cylinder and surrounds it to form the annular air separation chamber. The top inlet of the annular air separation chamber is connected to the annular feeding outlet, and the bottom of the annular air separation chamber has a solid outlet. Air vents are arranged on the wall of the annular air separation chamber. This sintering fuel sorting device obtains fixed-size fuel with a particle size of 0.5 mm to 3 mm, which is of great significance for improving the utilization efficiency of sintering fuel coal and reducing energy consumption.

Description

Technical Field

[0001] This invention relates to the field of sintering fuel sorting technology, and in particular, to a sintering fuel sorting device and a screening control method. Background Technology

[0002] The view that "strictly controlling the particle size distribution of solid fuel within a reasonable range will have a beneficial effect on the sintering process" has long been a common consensus in the industry.

[0003] In the steel industry, sintering is one of the major energy- and carbon-consuming processes. The particle size distribution of the solid fuel used in sintering is a crucial parameter affecting the sintering effect. The particle size of the coal used in sintering machines must be limited to a certain range, with a suitable particle size between 0.5 mm and 3 mm. Particle sizes that are too coarse or too fine are detrimental to sintering production. Both excessively coarse and excessively fine particle sizes of the solid fuel lead to technical problems such as low sintering utilization efficiency and high energy consumption in sintering production.

[0004] Therefore, developing a sintering fuel sorting device and a fuel coal screening control method to improve the screening efficiency of fuel coal is of great significance for improving the utilization efficiency of sintering fuel coal and reducing energy consumption. Summary of the Invention

[0005] The sintering fuel sorting device provided by the present invention solves the technical problem that it is difficult to achieve a fixed-size supply of sintering fuel within the range of 0.5 mm to 3 mm when screening sintering fuel.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A sintering fuel sorting device includes a mechanical primary screening and feeding mechanism, a dust guiding and exhaust mechanism, and an airflow secondary screening mechanism. The airflow secondary screening mechanism has an annular air separation chamber. The mechanical primary screening and feeding mechanism is located above the airflow secondary screening mechanism. The dust guiding and exhaust mechanism is located above the airflow secondary screening mechanism and together with the mechanical primary screening and feeding mechanism, forms an annular gas-solid interaction chamber. The annular gas-solid interaction chamber and the annular air separation chamber are interconnected. The top of the mechanical primary screening and feeding mechanism has a feed inlet, and the side of the mechanical primary screening and feeding mechanism has a large particle outlet. The bottom of the annular gas-solid interaction chamber has an annular feeding outlet. The outer wall of the annular gas-solid interaction chamber has a dust outlet, which is located above the annular feeding outlet. The airflow secondary screening mechanism includes a guide shroud and... The air-drawing inner cylinder and the flow-guiding outer cover are located below the dust-guiding and dust-removing mechanism. The air-drawing inner cylinder is located below the mechanical primary screening and material-laying mechanism. The flow-guiding outer cover is located outside the air-drawing inner cylinder and surrounds the air-drawing inner cylinder to form an annular air-classifying separation chamber. The top inlet of the annular air-classifying separation chamber is connected to the annular material-laying outlet. The bottom of the annular air-classifying separation chamber has a solid outlet. Air blowing ports are arranged on the cavity wall of the annular air-classifying separation chamber. Small particles no larger than 3 mm are obtained by screening through the mechanical primary screening and material-laying mechanism. Air blowing through the air blowing ports separates the small particles no larger than 3 mm that fall from the annular material-laying outlet toward the solid outlet. This causes the dust in the small particles to move upward and be discharged from the dust outlet, and causes the particulate matter in the small particles to move downward and be discharged to the solid outlet.

[0008] Furthermore, the secondary airflow screening mechanism also includes a primary air supply duct, a secondary air supply duct, and a tertiary air supply duct arranged sequentially along the height direction. The inner air intake cylinder has a primary air supply chamber corresponding to the primary air supply duct and a tertiary air supply chamber corresponding to the tertiary air supply duct. The primary and tertiary air supply chambers are separated, with the tertiary air supply chamber located below the primary air supply chamber. The secondary air supply duct has a secondary air supply chamber. The primary air supply duct passes through the guide shroud and connects to the primary air supply chamber to introduce airflow from outside the primary air supply chamber into the primary air supply chamber. A [missing information - likely a design feature or feature] is provided on the side wall of the primary air supply chamber. The first-stage air supply outlet blows air from the first-stage air supply chamber into the annular gas-solid interaction chamber and / or the annular air separation chamber. The third-stage air supply duct passes through the guide shroud and connects to the third-stage air supply chamber to introduce airflow from outside the third-stage air supply chamber into the third-stage air supply chamber. The side wall of the third-stage air supply chamber is provided with a third-stage air supply outlet, through which air is blown from the third-stage air supply chamber into the annular air separation chamber. The second-stage air supply duct is located outside the guide shroud and connects to the annular air separation chamber through a second-stage air supply outlet on the outer wall of the guide shroud, blowing air into the annular air separation chamber through the second-stage air supply outlet.

[0009] Furthermore, the secondary air supply duct includes an annular air inlet duct, an annular air outlet duct, and a radial connecting duct. The annular air outlet duct is installed in close contact with the outer wall of the guide shroud and is connected to the secondary air supply outlet. The annular air outlet duct has a secondary air supply chamber arranged in a ring. The annular air inlet duct is located around the annular air outlet duct and is connected to the annular air outlet duct through the radial connecting duct.

[0010] Furthermore, multiple secondary air outlets are evenly spaced along the circumference of the air guide cover.

[0011] Furthermore, the primary air supply duct is a radial air supply duct. The first end of the primary air supply duct is connected to the primary air supply chamber. The second end of the primary air supply duct passes radially through the annular air separation chamber and extends out to the outside of the guide shroud. The tertiary air supply duct includes a radial inlet pipe and an axial connecting pipe. The axial connecting pipe is arranged axially and its top is connected to the bottom of the tertiary air supply chamber. The bottom of the circumferential connecting pipe extends axially downward and is connected to the first end of the radial inlet pipe. The second end of the radial inlet pipe extends radially and extends out to the outside of the guide shroud.

[0012] Furthermore, the outer guide shroud includes a first tapered shroud, a tapered shroud, a second tapered shroud, a straight shroud, and a conical shroud with a discharge port at the bottom, which are sequentially spliced ​​along the height direction. The inner air intake cylinder includes a first tapered cylinder, a support cylinder, and a second tapered cylinder, which are sequentially spliced ​​along the height direction. The first tapered cylinder is located below the mechanical primary screening and material distribution mechanism and is arranged correspondingly to the first tapered shroud. The first tapered cylinder has a primary air supply chamber. The second tapered cylinder is arranged correspondingly to the second tapered shroud and has a tertiary air supply chamber.

[0013] Furthermore, the mechanical primary screening and feeding mechanism includes a primary screening discharge unit and a storage and feeding unit. The storage and feeding unit is located below the primary screening discharge unit. The primary screening discharge unit has a feed inlet at its top, a large particle outlet on its side, and a small particle outlet at its bottom. The storage and feeding unit has a feeding inlet at its top that communicates with the small particle outlet. The storage and feeding unit also has an annular feeding outlet located below the feeding inlet. The primary screening discharge unit includes two rows of opposing circular roller units. Each row of circular roller units is arranged inclined downwards outwards from its center. Each row of circular roller units includes multiple spaced conveying rollers. The roller gap is arranged in a gradually increasing manner from the center outwards, ranging from 0.5 mm to 3 mm. The roller gap between the two innermost roller units is 0.5 mm, and the roller gap between the two outermost roller units is 3 mm. The material storage and distribution unit includes a material storage cylinder and a material distribution component. The material storage cylinder is located below the roller unit and is connected to the small particle outlet. The material distribution component is located below the material storage cylinder and has a discharge gap between it and the material storage cylinder. The material distribution component is rotatably arranged around the central axis to disperse the material and allow it to enter the annular air separation chamber from the annular gas-solid action chamber.

[0014] Furthermore, the material dispersing assembly includes a material guide cone and a rotary drive unit arranged coaxially. The material guide cone is located at the drive end of the rotary drive unit, and the positioning end of the rotary drive unit is located on the airflow secondary screening mechanism. The material guide cone is driven to rotate around the central axis by the rotary drive unit, thereby causing the material to be discharged from the discharge gap.

[0015] Furthermore, the mechanical primary screening material feeding mechanism also includes a lifting and adjusting positioning component, which is used to drive the material storage cylinder to move axially and position it, thereby adjusting the size of the discharge gap.

[0016] The present invention also provides a method for controlling the screening of sintering fuel, comprising the following steps:

[0017] Small particles of 0 to 3 mm are obtained by the primary screening and discharge unit of the mechanical primary screening and feeding mechanism, and guided into the feeding and dispersing component of the mechanical primary screening and feeding mechanism. The feeding and dispersing component disperses the small particles of 0 to 3 mm and sends them into the annular gas-solid reaction chamber. The primary air supply chamber blows primary airflow into the annular gas-solid reaction chamber and / or the annular air separation chamber through the first air outlet to perform primary air separation of the material. The secondary air supply chamber blows secondary airflow into the annular air separation chamber through the second air outlet to perform secondary air separation of the material. The tertiary air supply chamber blows tertiary airflow into the annular air separation chamber through the third air outlet to perform tertiary air separation of the material. Some or all of the small particles of 0 to 3 mm that are dusty material below 0.5 mm are discharged from the dust outlet, and other small particles of 0 to 3 mm flow into the solid outlet.

[0018] The present invention has the following beneficial effects:

[0019] The sintering fuel sorting device and fuel coal screening control method of the present invention include a mechanical primary screening and feeding mechanism, a dust guiding and dust removal mechanism, and an airflow secondary screening mechanism. The mechanical primary screening and feeding mechanism is located above the airflow secondary screening mechanism. The mechanical primary screening and feeding mechanism is used to screen the initial fuel and allow small particles no larger than 3 mm to flow from the annular feeding outlet into the annular air separation chamber of the airflow secondary screening mechanism, while large particles larger than 3 mm are discharged from the large particle outlet. The small particles no larger than 3 mm are air separated in the annular gas-solid interaction chamber and the annular air separation chamber by inertial force and their own gravity, further separating all or part of the dust material no larger than 0.5 mm from the small particles and discharging it from the dust outlet. The granular material between 0.5 mm and 3 mm is discharged to the solid outlet, ultimately achieving the beneficial effect of obtaining sintering fuel with a fixed size in the range of 0.5 mm to 3 mm. The solution of the present invention obtains fuel with a fixed size of 0.5 mm to 3 mm, which is of great significance for improving the utilization efficiency of sintering fuel coal and reducing energy consumption.

[0020] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0022] Figure 1 This is one of the structural schematic diagrams of a sintering fuel sorting device in one embodiment of the present invention;

[0023] Figure 2This is a second schematic diagram of the sintering fuel sorting device in one embodiment of the present invention;

[0024] Figure 3 yes Figure 1 Sectional view at point AA;

[0025] Figure 4 yes Figure 1 Sectional view at point BB;

[0026] Figure 5 yes Figure 1 Enlarged view of point C in the middle;

[0027] Figure 6 yes Figure 1 Enlarged view at point D;

[0028] Figure 7 yes Figure 1 Top view of the sintering fuel sorting unit.

[0029] Legend:

[0030] 100. Sintering fuel sorting device; 10. Mechanical primary screening and feeding mechanism; 101. Annular gas-solid reaction chamber; 102. Feed inlet; 103. Large particle outlet; 104. Annular feeding outlet; 105. Dust outlet; 11. Primary screening discharge unit; 111. Small particle outlet; 112. Circular roller unit; 12. Material storage and feeding unit; 121. Feeding inlet; 122. Feeding storage cylinder; 123. Feeding dispersion assembly; 1231. Feeding guide cone; 1232. Rotary drive unit; 124. Lifting adjustment and positioning assembly; 20. Dust guiding and removal mechanism; 30. Airflow secondary screening mechanism; 31. Guide shroud; 311. 312. Gradually contracting hood; 313. Gradually expanding hood; 314. Second gradually contracting hood; 315. Straight cylinder hood; 316. Conical hood; 32. Inner air intake cylinder; 301. Annular air separation chamber; 302. Solid outlet; 321. Primary air supply chamber; 322. Tertiary air supply chamber; 323. First gradually contracting cylinder; 324. Support cylinder; 325. Second gradually contracting cylinder; 33. Primary air supply duct; 34. Secondary air supply duct; 341. Annular air inlet pipe; 342. Annular air outlet; 343. Radial connecting pipe; 35. Tertiary air supply duct; 401. Primary air outlet; 402. Secondary air outlet; 403. Tertiary air outlet. Detailed Implementation

[0031] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0034] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0035] Research has shown that sintering efficiency is high when the particle size of the fuel coal used in sintering machines is limited to the range of 0.5 to 3 mm. Both excessively coarse and excessively fine fuel particle sizes are detrimental to sintering production. When the fuel particle size is too coarse, the fuel distribution is uneven, resulting in excess heat and a strong reducing atmosphere around and below the coarse fuel particles, leading to slow combustion and incomplete combustion. Conversely, when the fuel particle size is too small, the sintering speed is fast, the combustion ratio increases, and the generated heat is insufficient to reach the required high temperature in the sinter, reducing the strength of the sinter. Fine fuel particles worsen the permeability of the sinter layer and may be carried away by the airflow, resulting in significant calorific value loss, lower fuel utilization, and increased solid fuel consumption. However, existing one- or two-stage open-circuit crushing processes are prone to problems with excessively large or small fuel particle sizes due to imperfect crushing systems and a lack of fine particle screening systems. This negatively impacts the quality of the sinter, reduces fuel utilization, and thus increases solid energy consumption. Currently, most sintering fuels, after crushing, have a particle size of over 30% smaller than 0.5 mm, reaching as high as 40%, and a particle size larger than 3 mm, accounting for over 25%, with a maximum exceeding 30%. Over-crushing is prone to occur during the crushing process. Studies have found that after primary crushing with roller crushers, particles smaller than 3 mm account for about 50% of the material. After a large number of qualified particles (0.5-3 mm) undergo further processing with four-roller crushers, the proportion of 0.5-3 mm particles does not increase significantly, while the proportion of particles smaller than 0.5 mm increases substantially. Most steel companies directly incorporate the crushed fuel into sintering production without any further treatment; therefore, the solid fuel consumption per ton of sintered ore exceeds the theoretical requirement.

[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 as well as Figure 7As shown, the present invention provides a sintering fuel sorting device 100, including a mechanical primary screening and feeding mechanism 10, a dust guiding and dust removal mechanism 20, and an airflow secondary screening mechanism 30. The airflow secondary screening mechanism 30 has an annular air separation chamber 301. The mechanical primary screening and feeding mechanism 10 is located above the airflow secondary screening mechanism 30. The dust guiding and dust removal mechanism 20 is located above the airflow secondary screening mechanism 30 and together with the mechanical primary screening and feeding mechanism 10, forms an annular gas-solid interaction chamber 101. The annular gas-solid interaction chamber 101 and the annular air separation chamber 301 are interconnected. The top of the mechanical primary screening and feeding mechanism 10 has a feed inlet 102, and the side of the mechanical primary screening and feeding mechanism 10 has a large particle outlet 103. The bottom of the annular gas-solid interaction chamber 101 has an annular feeding outlet 104. A dust outlet 105 is provided on the outer wall of the annular gas-solid interaction chamber 101, and the dust outlet 105 is located above the annular feeding outlet 104. The sub-mechanism 30 includes a flow guide shroud 31 and an air intake cylinder 32. The flow guide shroud 31 is located below the dust guiding and dust removal mechanism 20, and the air intake cylinder is located below the mechanical primary screening and material distribution mechanism 10. The flow guide shroud 31 is located outside the air intake cylinder 32 and forms an annular air separation chamber 301 with the air intake cylinder 32. The top inlet of the annular air separation chamber 301 is connected to the annular material distribution outlet 104. The bottom of the annular air separation chamber 301 has a solid outlet 302. Air nozzles are arranged on the cavity wall of the annular air separation chamber 301. Small particles no larger than 3 mm are obtained by screening through the mechanical primary screening and material distribution mechanism 10. Air is blown through the air nozzles to separate the small particles no larger than 3 mm falling from the annular material distribution outlet 104 toward the solid outlet 302. The dust in the small particles moves upward and is discharged from the dust outlet 105, and the particulate material in the small particles moves downward and is discharged to the solid outlet 302.

[0037] The sintering fuel sorting device 100 provided by the present invention includes a mechanical primary screening and feeding mechanism 10, a dust guiding and discharging mechanism 20, and an airflow secondary screening mechanism 30. The mechanical primary screening and feeding mechanism 10 is disposed above the airflow secondary screening mechanism 30. The mechanical primary screening and feeding mechanism 10 is used to screen the initial fuel and allow small particles no larger than 3 mm to flow from the annular feeding outlet 104 into the annular air separation chamber 301 of the airflow secondary screening mechanism 30, while allowing large particles larger than 3 mm to be discharged from the large particle outlet 103. The small particles no larger than 3 mm are discharged by inertia. The force and gravity of the particles are used to perform air separation in the annular gas-solid interaction chamber 101 and the annular air separation chamber 301, further separating all or part of the dust material no larger than 0.5 mm from the small particles and discharging them from the dust outlet 105. The particles between 0.5 mm and 3 mm are discharged to the solid outlet 302. Ultimately, the beneficial effect of obtaining sintered fuel with a fixed size of 0.5 mm to 3 mm is achieved. The solution of this invention obtains fuel with a fixed size of 0.5 mm to 3 mm, which is of great significance for improving the utilization efficiency of sintered fuel coal and reducing energy consumption.

[0038] Understandably, dust outlet 105 is mainly used to discharge dust materials within 0.5 mm with the airflow, large particle outlet 103 is mainly used to discharge large particles larger than 3 mm, and small particles no larger than 3 mm are discharged from the annular cloth outlet 104 and then undergo air separation in the annular gas-solid interaction chamber 101 and the annular air separation chamber 301.

[0039] Furthermore, the secondary airflow screening mechanism 30 also includes a primary air supply duct 33, a secondary air supply duct 34, and a tertiary air supply duct 35 arranged sequentially along the height direction. The inner air intake cylinder 32 has a primary air supply chamber corresponding to the primary air supply duct 33 and a tertiary air supply chamber corresponding to the tertiary air supply duct 35. The primary and tertiary air supply chambers 322 are separated, with the tertiary air supply chamber located below the primary air supply chamber. The secondary air supply duct 34 has a secondary air supply chamber. The primary air supply duct 33 passes through the guide shroud 31 and connects to the primary air supply chamber 321 to introduce airflow from outside the primary air supply chamber 321 into the primary air supply chamber 321. A primary air supply port 401 is provided on the side wall of the primary air supply chamber 321, through which airflow is introduced. Air is blown from the primary air supply chamber 321 into the annular gas-solid interaction chamber 101 and / or the annular air separation chamber 301 through the outlet 401. The tertiary air supply duct 35 passes through the guide cover 31 and is connected to the tertiary air supply chamber 322 to introduce airflow from outside the tertiary air supply chamber 322 into the tertiary air supply chamber 322. The side wall of the tertiary air supply chamber 322 is provided with a tertiary air supply outlet 403, through which air is blown from the tertiary air supply chamber 322 into the annular air separation chamber 301. The secondary air supply duct 34 is located outside the guide cover 31 and is connected to the annular air separation chamber 301 through the secondary air supply outlet 402 on the outer wall of the guide cover 31, through which air is blown into the annular air separation chamber 301. In a preferred embodiment of the present invention, a plurality of primary air outlets 401 are arranged at uniform intervals along the circumference, a plurality of secondary air outlets 402 are arranged at uniform intervals along the circumference, and a plurality of tertiary air outlets 403 are arranged at uniform intervals along the circumference.

[0040] In the air separation process of this invention, the primary air inlet 401 is located below the material guide cone 1231. The primary air inlet 401 is a microporous high-speed airflow. When small particles of material flow out of the material guide cone 1231, they are subjected to the action of the primary airflow. The airflow first contacts the fine particles, and the fine particles collide with the larger particles. Under the action of airflow and collision, the fine powder particles adhering to the larger particles fall off. At the same time, the falling material and the combined action of airflow generate high-speed impacts on the side wall of the device, and the collisions further separate the particles that are stuck together. 321 is fixed to the tower body by a square hollow beam. The inner cavity of the square beam is connected to the primary air supply chamber 321, and the outer side is the air inlet. The primary air supply port 401 blows air from the inner side of the center to the outer side. After the material passes through the primary airflow, it moves along the outer wall towards the center of the tower, and the tower diameter gradually decreases. After a certain distance, the tower diameter begins to increase. A secondary air supply duct 34 (with a secondary air supply chamber) is set at the turning point, and a ring of air holes is opened around the inner side of the secondary air supply chamber to form a secondary air outlet. To ensure uniform airflow, the secondary air supply duct 34 is enclosed in a ring of air holes around the inner wall of the cylinder. The system includes an annular inlet duct 341, an annular exhaust duct 342, and a radial connecting duct 343. Secondary airflow enters the annular exhaust duct 342 (secondary air supply chamber) and exits through the secondary outlet. A large air volume and medium velocity are used here, primarily to increase the appropriate air velocity to carry away the small particles dispersed by the primary airflow, thereby achieving the separation of most small particles. The secondary air supply outlet 402 blows air from the outer periphery towards the inner center. A tertiary airflow is provided below the secondary airflow, with the tertiary air supply chamber 322 positioned in the middle. The inlet duct is located below the tertiary air supply chamber 322. The outer wall of the three-stage air supply chamber 322 has a three-stage air supply outlet 403. The three-stage airflow is adjustable, and its main purpose is to supplement the air separation of small particles that have not been carried away in the material falling here. At the same time, according to the process requirements for the proportion of particles smaller than 0.5 mm, the air volume is adjusted to control the separation of small particles. The air volume can be adjusted by controlling the size of the pipeline valves or by using an intermittent pressure-stabilized air supply method. The intermittent pressure-stabilized air supply maintains a constant airflow pressure and achieves intermittent airflow by changing the frequency of opening and closing the air outlets. The higher the frequency, the more air is delivered, and the lower the frequency, the less air is delivered. By changing the air volume, the removal rate of particles smaller than 0.5 mm can be adjusted from 50% to 80%.

[0041] Furthermore, an airlock valve is arranged at the solid outlet 302. In this invention, qualified material after air separation accumulates at the lower end of the tower (guide shroud 31) and is discharged by the airlock valve (star valve, etc.). Separate particles are discharged with the airflow from the dust discharge port at the top of the tower and enter the next processing step. Specifically, an airflow velocity sensor is installed below the dust outlet 105 to monitor the operating airflow velocity. Each airflow adjusts its volume according to the airflow velocity to ensure stable equipment operation. This achieves a fixed-size supply of sintering fuel within the range of 0.5~3 mm.

[0042] In one specific embodiment of the present invention, the dust guiding and dust removal mechanism 20 is a dust guiding and dust removal hood, which covers the material storage and fabric distribution unit 12 and surrounds the material storage and fabric distribution unit 12 to form an annular gas-solid interaction cavity 101 and an annular fabric distribution outlet 104. Specifically, the dust guiding and dust removal hood includes a first hood cylinder with a dust outlet 105, a straight hood cylinder located below the first hood body, a reducing and expanding hood cylinder located below the straight hood body, and a straight hood cylinder located below the reducing and expanding hood body.

[0043] Furthermore, in order to achieve stable air supply and air separation, the secondary air supply duct 34 includes an annular air inlet duct 341, an annular air outlet duct 342, and a radial connecting duct 343. The annular air outlet duct 342 is set to fit against the outer wall of the guide cover 31 and is connected to the secondary air outlet 402 on the outer wall of the guide cover 31. The annular air inlet duct 341 is located around the annular air outlet duct 342 and is connected to the annular air outlet duct 342 through the radial connecting duct 343.

[0044] Optionally, multiple radial connecting pipes 343 are arranged at uniform intervals along the circumference.

[0045] Furthermore, multiple secondary air outlets 402 are evenly spaced along the circumference of the air guide cover 31.

[0046] Furthermore, in order to achieve stable air supply and air separation, the primary air supply duct is a radial air supply duct. The first end of the primary air supply duct is connected to the primary air supply chamber, and the second end of the primary air supply duct passes radially through the annular air separation chamber 301 and extends out to the outside of the guide cover 31. The tertiary air supply duct includes a radial inlet pipe and an axial connecting pipe. The axial connecting pipe is arranged axially and its top is connected to the bottom of the tertiary air supply chamber. The bottom of the circumferential connecting pipe extends axially downward and is connected to the first end of the radial inlet pipe. The second end of the radial inlet pipe extends radially and extends out to the outside of the guide cover 31.

[0047] Furthermore, the outer shroud 31 includes a first tapered shroud 311, a tapered shroud 312, a second tapered shroud 313, a straight shroud 314, and a conical shroud 315 with a discharge port at the bottom, which are sequentially spliced ​​along the height direction. The inner air-guiding cylinder 32 includes a first tapered cylinder 323, a supporting cylinder 324, and a second tapered cylinder 325, which are sequentially spliced ​​along the height direction. The first tapered cylinder 323 is located below the mechanical primary screening and feeding mechanism and is arranged correspondingly to the first tapered shroud 311. The first tapered cylinder 323 has a primary air supply chamber. The second tapered cylinder 325 is arranged correspondingly to the second tapered shroud 313 and has a tertiary air supply chamber. Understandably, in this invention, the first tapered cover 311 and the tapered cover 312 are spliced ​​together to form a turning point; the first-stage air supply chamber is located at the head of the first cover, the second-stage air supply chamber is located at the turning point, and the third-stage air supply chamber is located at the tail of the tapered cover 312. Under the action of airflow in different directions and the guiding action of the guide cover 31 wall at different angles, air separation is performed. The structure is reasonably designed to avoid material accumulation on the side wall of the guide cover 31.

[0048] Optionally, in this invention, the flow guide cover 31, the air intake inner cylinder 32, and the fabric guide cone 1231 are arranged coaxially. In order to ensure air supply efficiency, both the primary air supply chamber and the secondary air supply chamber are cone-shaped air chambers with enlarged heads.

[0049] Furthermore, the mechanical primary screening and feeding mechanism 10 includes a primary screening discharge unit 11 and a storage and feeding unit 12. The storage and feeding unit 12 is located below the primary screening discharge unit 11. The primary screening discharge unit 11 has a feed inlet 102 at its top, a large particle outlet 103 on its side, and a small particle outlet 111 at its bottom. The storage and feeding unit 12 has a feeding inlet 121 at its top that communicates with the small particle outlet 111. The storage and feeding unit 12 also has an annular feeding outlet 104 located below the feeding inlet 121. The primary screening discharge unit 11 includes two rows of oppositely arranged circular roller units 112. The single-row circular roller units 112 are arranged inclined downwards from the center outwards. The single-row circular roller unit 112 includes multiple spaced conveying rollers. The roller gap of the roller unit 112 is arranged in a manner that gradually increases from the center outwards. The roller gap gradually increases from the inside to the outside from 0.5 mm to 3 mm. The roller gap between the two innermost roller units 112 is 0.5 mm, and the roller gap between the two outermost roller units 112 is 3 mm. The material storage and distribution unit 12 includes a material storage cylinder 122 and a material distribution component 123. The material storage cylinder 122 is located below the roller unit 112 and is connected to the small particle outlet 111. The material distribution component 123 is located below the material storage cylinder 122 and leaves a discharge gap between it and the material storage cylinder 122. The material distribution component 123 is rotatably arranged around the central axis to disperse the material and allow it to enter the annular air separation chamber 301 from the annular gas-solid action chamber 101. In practical implementation, the mechanical primary screening and feeding mechanism 10 includes two rows of opposing circular roller units 112. Each row of circular roller units 112 is arranged inclined downwards from the center outwards. Each row of circular roller units 112 includes multiple spaced conveying rollers. An inlet 102 is provided at the top of the large particle screening device, containing two rows of circular rollers. Each row of rollers is gradually inclined outwards from the center, with an angle between 0-20°. The roller gap increases progressively, from 0.5-3 mm from the inside out, with a maximum gap not exceeding 3 mm. A discharge chute is provided at the outer end of the rollers to collect large particle fuel. The rotating rollers convey the material outwards, during which small particles fall through the roller gaps, thus achieving particle size separation. To improve screening efficiency, the roller speed gradually increases from the center outwards, gradually dispersing the material thinner. Furthermore, the speed difference between the front and rear rollers enhances particle size separation and increases collisions between particles, removing adhering fine particles from large particles.

[0050] Furthermore, the mechanical primary screening and feeding mechanism 10 also includes a lifting and adjusting positioning component 124. The lifting and adjusting positioning component 124 is used to drive the feeding storage cylinder 122 to move axially and position it, thereby adjusting the size of the discharge gap. In a specific embodiment of the present invention, the first end of the lifting and adjusting positioning component 124 is provided on the tower body, and the second end of the lifting and adjusting positioning mechanism is fixedly connected to the feeding storage cylinder 122. The lifting and adjusting positioning mechanism is used to drive the feeding storage cylinder 122 to move axially and position it, thereby adjusting the size of the discharge gap.

[0051] Furthermore, the material dispersing assembly 123 includes a coaxially arranged material guide cone 1231 and a rotary drive unit 1232. The material guide cone 1231 is located at the driving end of the rotary drive unit 1232, and the positioning end of the rotary drive unit 1232 is located on the airflow secondary screening mechanism 30. The rotary drive unit 1232 drives the material guide cone 1231 to rotate around the central axis, thereby causing the material to be discharged from the discharge gap. Optionally, the rotary drive unit 1232 is a bevel gear transmission structure. The lifting and adjusting positioning component 124 can adjust the position of the material storage cylinder 122 up and down to adjust the size of the material opening. The material guide cone 1231 rotates at low speed, and the material flows down along the cone surface. As the diameter of the cone cross-section increases, the material gradually disperses, which is conducive to the airflow fully contacting the particles. The rotation of the material guide cone 1231 solves the problem of material blockage at the material opening, and the particle distribution is more uniform. The roller screen classifies and screens, with small particles concentrated in the middle and large particles on the outside, so that a large number of small particles are concentrated at the bottom, which is convenient for air separation.

[0052] The present invention also provides a sintering fuel screening control method, comprising the steps of: obtaining small particulate material of 0 to 3 mm through the primary screening discharge unit 11 of the mechanical primary screening material distribution mechanism 10, and guiding the small particulate material of 0 to 3 mm into the material distribution and dispersion component 123 of the mechanical primary screening material distribution mechanism 10; dispersing the small particulate material of 0 to 3 mm through the material distribution and dispersion component 123 and sending it into the annular gas-solid interaction chamber 101; and blowing primary airflow into the annular gas-solid interaction chamber 101 and / or through the first air outlet of the primary air supply chamber. The annular air separation chamber 301 performs primary air separation on the material. The secondary air supply chamber blows secondary airflow into the annular air separation chamber 301 through the second air outlet to perform secondary air separation on the material. The tertiary air supply chamber blows tertiary airflow into the annular air separation chamber 301 through the third air outlet to perform tertiary air separation on the material. Some or all of the small particles of 0 to 3 mm that are dust particles smaller than 0.5 mm are discharged from the dust outlet 105, while other small particles of 0 to 3 mm flow into the solid outlet 302.

[0053] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A sintering fuel sorting device, characterized in that it comprises a mechanical primary screening and distributing mechanism, a dust guiding and discharging mechanism, and an airflow secondary screening mechanism, the airflow secondary screening mechanism has a ring-shaped air- elutriation separation chamber, the mechanical primary screening and distributing mechanism is arranged above the airflow secondary screening mechanism, the dust guiding and discharging mechanism is arranged above the airflow secondary screening mechanism and forms a ring-shaped gas-solid interaction chamber together with the mechanical primary screening and distributing mechanism, the ring-shaped gas-solid interaction chamber and the ring-shaped air- elutriation separation chamber are in communication with each other, the top of the mechanical primary screening and distributing mechanism has a feeding port, the lateral side of the mechanical primary screening and distributing mechanism has a large-particle outlet, the bottom of the ring-shaped gas-solid interaction chamber has a ring-shaped distributing outlet, a dust outlet is arranged on the outer wall of the cavity of the ring-shaped gas-solid interaction chamber, and the dust outlet is above the ring-shaped distributing outlet, the airflow secondary screening mechanism comprises a flow guiding outer cover and an air induction inner cylinder, the flow guiding outer cover is arranged below the dust guiding and discharging mechanism, the air induction inner cylinder is arranged below the mechanical primary screening and distributing mechanism, the flow guiding outer cover is arranged outside the air induction inner cylinder and forms the ring-shaped air- elutriation separation chamber together with the air induction inner cylinder, the top inlet of the ring-shaped air- elutriation separation chamber is in communication with the ring-shaped distributing outlet, the bottom of the ring-shaped air- elutriation separation chamber has a solid outlet, and the cavity wall of the ring-shaped air- elutriation separation chamber is provided with a blowing port, the airflow secondary screening mechanism further comprises a first-stage air supply pipeline, a second-stage air supply pipeline and a third-stage air supply pipeline arranged in sequence in the height direction, the air induction inner cylinder has a first-stage air supply chamber corresponding to the first-stage air supply pipeline and a third-stage air supply chamber corresponding to the third-stage air supply pipeline, the first-stage air supply chamber and the third-stage air supply chamber are arranged in isolation, the third-stage air supply chamber is below the first-stage air supply chamber, the second-stage air supply pipeline has a second-stage air supply chamber, the flow guiding outer cover comprises a first tapered cover body, a diverging cover body, a second tapered cover body, a straight cylinder cover body and a conical cover body with a discharging port at the bottom arranged in sequence in the height direction, and the air induction inner cylinder comprises a first tapered cylinder body, a support cylinder body and a second tapered cylinder body arranged in sequence in the height direction, wherein the first tapered cylinder body is below the mechanical primary screening and distributing mechanism and is correspondingly arranged with the first tapered cover body, the first tapered cylinder body has a first-stage air supply chamber therein, the second tapered cylinder body is correspondingly arranged with the second tapered cover body, and the second tapered cylinder body has a third-stage air supply chamber, small-particle materials not greater than 3 mm are obtained through the screening of the mechanical primary screening and distributing mechanism, and the small-particle materials not greater than 3 mm falling from the ring-shaped distributing outlet towards the solid outlet are air- elutriated through the blowing of the blowing port, so that the dust in the small-particle materials moves upwards and is discharged from the dust outlet, and the granular materials in the small-particle materials move downwards and are discharged to the solid outlet.

2. The sintering fuel sorting device according to claim 1, characterized in that ​ The first-stage air supply pipeline passes through the guide outer cover and communicates with the first-stage air supply chamber for introducing air flow from outside the first-stage air supply chamber into the first-stage air supply chamber, and a first-stage air supply port is arranged on the side wall surface of the first-stage air supply chamber for blowing air from the first-stage air supply chamber into the annular gas-solid action cavity and / or the annular air separation cavity, The third-stage air supply pipeline passes through the guide outer cover and communicates with the third-stage air supply chamber for introducing air flow from outside the third-stage air supply chamber into the third-stage air supply chamber, and a third-stage air supply port is arranged on the side wall surface of the third-stage air supply chamber for blowing air from the third-stage air supply chamber into the annular air separation cavity, The second-stage air supply pipeline is arranged outside the guide outer cover, and the second-stage air supply pipeline communicates with the annular air separation cavity through a second-stage air supply port arranged on the outer side wall surface of the guide outer cover for blowing air into the annular air separation cavity through the second-stage air supply port.

3. The sinter fuel sorting device according to claim 2, characterized in that The second-stage air supply pipeline comprises an annular air inlet pipe, an annular air outlet pipe and a radial communication pipe, the annular air outlet pipe is arranged in close contact with the outer wall surface of the guide outer cover, the annular air outlet pipe is arranged in communication with the second-stage air supply port, and the annular air outlet pipe has the second-stage air supply chamber arranged in a circular ring shape, The annular air inlet pipe is arranged at the periphery of the annular air outlet pipe and is arranged in communication with the annular air outlet pipe through the radial communication pipe.

4. The sinter fuel sorting device according to claim 3, characterized in that A plurality of second-stage air supply ports are uniformly spaced along the circumference of the guide outer cover.

5. The sinter fuel sorting device according to claim 2, characterized in that The first-stage air supply pipeline is a radial air supply pipeline, a first end of the first-stage air supply pipeline is in communication with the first-stage air supply chamber, and a second end of the first-stage air supply pipeline passes through the annular air separation cavity in a radial direction and extends out of the guide outer cover, The third-stage air supply pipeline comprises a radial introduction pipe and an axial communication pipe, the axial communication pipe is arranged in an axial direction and has a top portion in communication with the bottom portion of the third-stage air supply chamber, the bottom portion of the axial communication pipe extends downward in the axial direction and is arranged in communication with the first end of the radial introduction pipe, and the second end of the radial introduction pipe extends in a radial direction and extends out of the guide outer cover.

6. The sinter fuel sorting device according to any one of claims 1 to 5, characterized in that The mechanical primary screening and distributing mechanism comprises a primary screening and discharging unit and a storage and distributing unit, the storage and distributing unit is arranged at the lower portion where the primary screening and discharging unit is located, the top portion of the primary screening and discharging unit has the material inlet, the lateral portion of the primary screening and discharging unit has the large-particle outlet, the bottom portion of the primary screening and discharging unit has a small-particle outlet, the top portion of the storage and distributing unit has a distributing inlet in communication with the small-particle outlet, and the annular distributing outlet is arranged below the distributing inlet on the storage and distributing unit. The primary screening and discharging unit comprises two rows of circular roller units arranged oppositely, and each row of the circular roller units is arranged downwardly and outwardly from the center, and each row of the circular roller units comprises a plurality of spaced conveying rollers, wherein the circular roller gaps of each row of the circular roller units are arranged in a gradually increasing manner from the center to the outside, and the circular roller gaps gradually increase from the inside to the outside by 0.5-3 mm, the circular roller gap between the two circular roller units at the innermost side is 0.5 mm, and the circular roller gap between the two circular roller units at the outermost side is 3 mm, The material storage and distribution unit comprises a material storage cylinder and a material distribution assembly, the material storage cylinder is arranged below the circular roller units and communicates with the small particle outlet, and the material distribution assembly is arranged below the material storage cylinder and has a discharging gap with the material storage cylinder, and the material distribution assembly is rotatably arranged about a central axis to make the material be distributed and enter the annular pneumatic separation chamber from the annular gas-solid interaction chamber.

7. The sinter fuel sorting device according to claim 6, characterized in that The material distribution assembly comprises a material guide cone and a rotary driving part arranged coaxially, the material guide cone is arranged at the driving end of the rotary driving part, the positioning end of the rotary driving part is arranged on the airflow secondary screening mechanism, and the rotary driving part drives the material guide cone to rotate about the central axis, so that the material is discharged from the discharging gap.

8. The sinter fuel sorting device according to claim 6, characterized in that The mechanical primary screening and material distribution mechanism further comprises a lifting and adjusting positioning assembly for driving the material storage cylinder to move axially and be positioned, so as to adjust the size of the discharging gap.

9. A sintering fuel sizing control method characterized by, The sinter fuel sorting device according to any one of claims 1-8 comprises the following steps: The small particle material of 0-3 mm is obtained by the primary screening and discharging unit of the mechanical primary screening and material distribution mechanism, and the small particle material of 0-3 mm is guided into the material distribution assembly of the mechanical primary screening and material distribution mechanism; The small particle material of 0-3 mm is distributed by the material distribution assembly and sent into the annular gas-solid interaction chamber; The primary air flow is blown into the annular gas-solid interaction chamber and / or the annular pneumatic separation chamber by the first blowing port of the primary air supply chamber to perform primary pneumatic separation on the material, the secondary air flow is blown into the annular pneumatic separation chamber by the second blowing port of the secondary air supply chamber to perform secondary pneumatic separation on the material, and the tertiary air flow is blown into the annular pneumatic separation chamber by the third blowing port of the tertiary air supply chamber to perform tertiary pneumatic separation on the material; Part or all of the small particle material of 0-3 mm is discharged from the dust outlet as dust material of 0.5 mm or less, and the other small particle material of 0-3 mm flows into the solid outlet.

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