Method for uniform sintering of air volume

Abstract

The present application provides a kind of method of uniform sintering air volume, it is related to the field of iron and steel metallurgy, comprising the following steps: step one, in the process of sintering bottom material, arrangement hydraulic flat roller, install material height measuring instrument above the trolley after flat roller, the control valve of bottom material bin is linked with the pressure of flat roller, and the average determination result of computer and material height measuring instrument is controlled;Step two, in the process of sintering distribution, after arranging pressure roller after small gate opening control mud roller distribution, install material height measuring instrument directly above the trolley after pressure roller, and the average determination result of computer and material height measuring instrument is linked with small gate opening and the pressure of pressure roller and controlled;Step three, in the process of sintering exhaust, set up air distribution vertical baffle at the left and right sides of the same trolley bottom air box entrance and middle butt joint beam, set up air isolation horizontal baffle on the partition beam between air box and air box along the direction of trolley operation, and reasonably distribute air volume.

Description

Technical Field

[0001] This invention relates to the field of iron and steel metallurgy, and more particularly to a method for uniform sintering air volume. Background Technology

[0002] In the iron ore sintering process, "air, water, and carbon" are crucial factors affecting the yield and quality of sintered ore. Among these, achieving a reasonable air distribution is fundamental and one of the essential measures for achieving thick-layer sintering and homogenous sintering. For example, low negative pressure ignition is generally used at the head of the sintering machine, requiring a reduction in air volume. This is to fully utilize the ignition heat energy, reduce gas consumption, and prevent the material layer's permeability from decreasing due to excessively high negative pressure. At the tail end of the sintering machine, after sintering and combustion are complete, the permeability of the sintered ore increases sharply, again necessitating a reduction in air volume to prevent the increase of ineffective airflow. Therefore, a reasonable air distribution along the length of the sintering machine is crucial for reducing air leakage and the power consumption of the main exhaust fan. Furthermore, since the vertical combustion speed of the sintering machine is directly affected by the air volume, especially when the material surface on the trolley is uneven, it can lead to inconsistencies in the combustion zone along the height, causing over-burning or under-burning at the end of the sintering machine. Therefore, the air volume of the sintering machine must be matched with the height of the material layer in the sintering machine. It is not that the larger the air volume, the better. The appropriate air volume can increase the output of the sintering machine while ensuring quality.

[0003] However, there are currently no good measures at home and abroad to achieve a reasonable distribution of air volume. The main technical measures generally adopted are: (1) reasonable distribution of fuel, which is achieved by controlling the combustion of fuel to achieve a reasonable distribution of air volume in the vertical and horizontal directions of the material layer; (2) reasonable distribution of particle size, which is achieved by controlling the reasonable distribution of air volume in the vertical and horizontal directions of large and small particles through segregation distribution; (3) control by the flap valve of the air box to achieve the air volume distribution of different air boxes; (4) implementation of blind grate bars to achieve the air volume distribution of the trolley in the horizontal direction, etc. Among them, measures (1), (2), and (4) are indirect control, and their effects are very limited. Measure (3) is direct control, but the control method is very crude, and most sintering machines are in a state of failure, which needs to be improved and refined. Summary of the Invention

[0004] To address the technical problem that the aforementioned measures for achieving a reasonable airflow distribution have not reached a high level of precision, this invention provides a method for uniform sintering airflow. This invention automates and interlocks the base material laying and distribution processes, achieving flatness of the base material and mixture on the trolley. Firstly, it achieves a uniform airflow distribution in the horizontal direction of the trolley. Secondly, by implementing a uniform airflow vertical plate and an airflow-isolieving horizontal plate on the upper part of the air box, it achieves a reasonable distribution of airflow in the vertical direction and the overall airflow of the sintering machine.

[0005] The technical means employed in this invention are as follows:

[0006] A method for uniform sintering air volume includes the following steps:

[0007] Step 1: During the sintering and bottom material laying process, a hydraulic leveling roller is arranged. The material leveling height measuring instrument is installed directly above the trolley after the leveling roller has leveled the material, 20-100cm away from the side baffles of the trolley, and at the center of the trolley. The control valve of the bottom material trough and the pressure of the leveling roller are linked and controlled by the computer and the average measurement result of the material leveling height measuring instrument.

[0008] Step 2: During the sintering and feeding process, after the mud roller feeds the material by controlling the opening of the small gate, the pressing roller is arranged. The material level height measuring instrument is installed directly above the trolley after the pressing roller presses the material, 20-100cm away from the side baffles of the trolley, and at the center of the trolley. The opening of the small gate and the pressure of the pressing roller are linked and controlled by the computer with the average measurement results of the material level height measuring instrument.

[0009] Step 3: During the sintering exhaust process, vertical baffles for uniform air distribution are installed at the left and right air box inlets and the middle connecting beam at the bottom of the same trolley, and horizontal baffles for air isolation are installed on the partition beams between the air boxes along the trolley's running direction.

[0010] Furthermore, step one specifically includes the following process:

[0011] When the measured height of the material surface is less than 60% of the set bottom material height, the opening of the control valve of the bottom material trough remains unchanged, and the material surface is leveled to within ±20% of the set height by the leveling roller;

[0012] When the measured height is greater than or equal to 60% of the set height, first reduce the valve opening of the bottom material trough. When the measured material surface height is less than 60% of the set height, keep the valve opening of the trough unchanged and use the leveling roller to level the material surface to within ±20% of the set height.

[0013] When the measured material level is less than the set height, first increase the valve opening of the bottom material trough. When the measured material level is less than 60% of the set height, keep the valve opening of the trough unchanged and use the leveling roller to level the material level to within ±20% of the set height.

[0014] Furthermore, step two specifically includes the following process:

[0015] When the material level measuring instrument measures a height that exceeds the baffle by less than 8%, the small gate opening remains unchanged, and the material level is pressed down to be flush with the baffle height by the pressure roller.

[0016] When the measured height is greater than or equal to 8% of the baffle height, first reduce the opening of the small gate. When the measured material surface height exceeds 8% of the baffle height, keep the opening of the small gate unchanged and press the material surface to be flush with the baffle height using the pressure roller.

[0017] When the measured material level is less than the baffle height, first increase the opening of the small gate. When the measured material level exceeds the baffle height by less than 8%, keep the opening of the small gate unchanged and press the material level with the baffle height using the pressure roller.

[0018] Furthermore, in step three, the angles of the vertical baffles on the connecting beam and the horizontal baffles on the partition beam are not adjustable. The angles of the vertical baffles on the left and right sides of the trolley with respect to the horizontal direction are independently adjusted by computer, and the adjustment angles of the vertical baffles on each side of the trolley are kept consistent.

[0019] Furthermore, in step three, the number of vertical baffles for wind distribution on each side of the windbox is configured according to the width of the windbox and is greater than or equal to two; the spacing between the vertical baffles for wind distribution on each side of the windbox is set according to the width of the windbox, and the vertical baffles for wind distribution on both sides of the windbox are symmetrically arranged.

[0020] Furthermore, the adjustment angle range of each wind-equalizing vertical baffle with respect to the horizontal direction is 40° to 90°.

[0021] Furthermore, in step three, the windproof horizontal baffles are installed along the running direction of the sintering machine, on the partition beams between the next wind box and one-fifth, two-fifths, three-fifths, and four-fifths of the total number of wind boxes, and between the last wind box and the sealing plate at the tail of the sintering machine.

[0022] Furthermore, the flat roller and the pressure roller are convex in shape.

[0023] Furthermore, the height of the pressure roller is adjusted hydraulically.

[0024] Furthermore, the width of the pressure roller is equal to the width of the material surface on the trolley.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] This invention achieves leveling of the base material and the mixed material surface on the sintering machine trolley by adding intelligent control to the base material laying and spreading processes, ensuring consistent air pressure and air volume in the horizontal direction of the material surface. Simultaneously, by adding vertical air-equalizing plates and horizontal air-isolieving plates, the air volume in the vertical direction can be balanced, and the air volume of the air boxes at different locations can be rationally distributed, maximizing the utilization of the sintering machine's effective air volume and reducing air leakage caused by uneven material surfaces or unreasonable air volume distribution.

[0027] This invention enables automated control of each sintering process, aligns with future production trends, significantly reduces manual labor intensity, and facilitates further development of the sintering process, thus possessing considerable promotional value. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a front view of the bellows with added vertical baffles for uniform airflow in this invention.

[0030] Figure 2 This is a side view of the bellows with a vertical baffle plate for uniform airflow in this invention.

[0031] Figure 3 This is a side view of the bellows after the addition of a windproof horizontal baffle in this invention.

[0032] In the diagram: 1. Horizontal baffle for windbreak; 2. Vertical baffle for wind distribution; 3. Connecting beam; 4. Dividing beam; 5. Air box. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0037] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0038] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0039] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0040] like Figure 1-3As shown, the present invention provides a method for uniform sintering air volume, comprising the following steps:

[0041] Step 1: During the sintering and bottom material laying process, a hydraulic leveling roller is arranged. The leveling roller is slightly "convex". A material surface height measuring instrument is installed directly above the trolley after the leveling roller has leveled the material, 20-100cm away from the side baffles of the trolley, and at the center of the trolley. The control valve of the bottom material trough and the pressure of the leveling roller are linked and controlled by the computer and the average measurement results of the material surface height measuring instrument.

[0042] When the measured height of the material surface is less than 60% of the set bottom material height, the opening of the control valve of the bottom material trough remains unchanged, and the material surface is leveled to within ±20% of the set height by the leveling roller;

[0043] When the measured height is greater than or equal to 60% of the set height, first reduce the valve opening of the bottom material trough. When the measured material surface height is less than 60% of the set height, keep the valve opening of the trough unchanged and use the leveling roller to level the material surface to within ±20% of the set height.

[0044] When the measured material level is less than the set height, first increase the valve opening of the bottom material trough. When the measured material level is less than 60% of the set height, keep the valve opening of the trough unchanged and use the leveling roller to level the material level to within ±20% of the set height.

[0045] Step 2: During the sintering and feeding process, after the mud roller feeds the material according to the small gate opening, a pressure roller with the same width as the material surface on the trolley is arranged. The pressure roller is slightly "convex" and its height is adjusted hydraulically. A material surface height measuring instrument is installed directly above the trolley after the pressure roller has pressed the material, 20-100cm away from the side baffles of the trolley, and at the center of the trolley. The small gate opening and the pressure of the pressure roller are linked and controlled by the computer with the average measurement results of the material surface height measuring instrument. If a trapezoidal feeding method with a material layer height exceeding the baffle height is used, the preset trapezoidal material layer height is used to replace the baffle height.

[0046] When the material level measuring instrument measures a height that exceeds the baffle by less than 8%, the small gate opening remains unchanged, and the material level is pressed down to be flush with the baffle height by the pressure roller.

[0047] When the measured height is greater than or equal to 8% of the baffle height, first reduce the opening of the small gate. When the measured material surface height exceeds 8% of the baffle height, keep the opening of the small gate unchanged and press the material surface to be flush with the baffle height using the pressure roller.

[0048] When the measured material level is less than the baffle height, first increase the opening of the small gate. When the measured material level exceeds the baffle height by less than 8%, keep the opening of the small gate unchanged and press the material level with the baffle height using the pressure roller.

[0049] Step 3: During the sintering exhaust process, vertical baffles 2 for uniform air distribution are installed at the inlet of the left and right air boxes 5 at the bottom of the same trolley and on the middle connecting beam 3. Horizontal baffles 1 for wind isolation are installed on the partition beam 4 between the air boxes 5 along the trolley running direction.

[0050] In step three, the angles of the vertical baffle 2 on the connecting beam 3 and the horizontal baffle 1 on the partition beam 4 are not adjustable. The angles of the vertical baffle 2 on the left and right sides of the trolley and the horizontal direction are independently adjusted by computer, and the adjustment angle of the vertical baffle 2 on each side of the trolley is consistent.

[0051] In step three, the number of wind equalization vertical baffles 2 on each side of the wind box 5 is configured according to the width of the wind box 5 and is greater than or equal to two; the spacing between the wind equalization vertical baffles 2 on each side of the wind box 5 is set according to the width of the wind box 5, and the wind equalization vertical baffles 2 on both sides are symmetrically arranged.

[0052] The adjustment angle range of each wind-equalizing vertical baffle 2 with the horizontal direction is 40° to 90°.

[0053] In step three, the windproof horizontal baffle 1 is set along the running direction of the sintering machine, on the partition beam 4 between the wind box 5 and the next wind box 5 at one-fifth, two-fifths, three-fifths, and four-fifths of the total number of wind boxes 5, and between the last wind box 5 and the sealing plate at the tail of the sintering machine.

[0054] Example 1

[0055] A sintering machine with a width of 5 meters and a total area of ​​405 square meters has 22 air boxes in total (5 in total), and is a double-sided air box type. During the base material laying process, the thickness of the base material is controlled at 60mm. The leveling roller for laying the base material is slightly convex. A material surface height measuring instrument is installed directly above the trolley after leveling, 35cm from the side baffles of the trolley, and at the center of the trolley. The control valve of the base material trough and the pressure of the leveling roller are intelligently controlled by a computer based on the average measurement results of the material surface height measuring instrument, ensuring that the base material thickness is within the range of 48-72mm.

[0056] During the sintering and feeding process, a 5-meter-long pressure roller is arranged, with a baffle height of 900mm. The material layer thickness is controlled at 900mm. The pressure roller is slightly convex and its height is adjusted hydraulically. A material surface height measuring instrument is installed directly above the trolley after the pressure roller has pressed the material, 40cm away from the baffles on both sides of the trolley, and at the center of the trolley. When the measured material surface height is 900-972mm, the opening of the small gate and the pressure of the pressure roller are intelligently controlled by a computer based on the average measurement results of the material surface height measuring instrument to ensure that the total material layer thickness is 900mm.

[0057] Along the sintering machine's operating direction, all air boxes on both the left and right sides are equipped with two sets of vertical baffles 2 (a total of four sets), and a fixed vertical baffle 2 is installed on the middle connecting beam 3. Along the sintering machine's operating direction, an air-blocking horizontal baffle 1 is installed between the fourth and fifth air boxes 5, and the angle between each of the four sets of vertical baffles 2 in the first to fourth air boxes 5 and the horizontal direction is 40°; an air-blocking horizontal baffle 1 is installed between the eighth and ninth air boxes 5, and the angle between each of the four sets of vertical baffles 2 in the fifth to eighth air boxes 5 and the horizontal direction is 80°; an air-blocking horizontal baffle 1 is installed between the thirteenth and fourteenth air boxes 5, and... Furthermore, the angle between the four sets of vertical baffles 2 for wind distribution in each of the 9th to 13th wind boxes 5 and the horizontal direction is 90°; an air-insulating horizontal baffle 1 is installed between the 17th and 18th wind boxes 5, and the angle between the four sets of vertical baffles 2 for wind distribution in each of the 14th to 17th wind boxes 5 and the horizontal direction is 90°; an air-insulating horizontal baffle 1 is installed between the 22nd wind box 5 and the tail sealing plate, and the angle between the four sets of vertical baffles 2 for wind distribution in each of the 18th to 22nd wind boxes 5 and the horizontal direction is 50°.

[0058] Example 2

[0059] A 600-square-meter sintering machine, 6 meters wide, has a total of 25 air boxes (5 in total) in a double-sided configuration. During the base material laying process, the thickness is controlled at 50mm. The leveling roller for laying the base material is slightly convex. A material leveling instrument is installed directly above the trolley after leveling, 80cm from the side baffles of the trolley, and at the center of the trolley. The control valves of the base material trough and the pressure of the leveling roller are intelligently controlled by a computer based on the average measurement results from the material leveling instrument, ensuring that the base material thickness remains within the range of 40-60mm.

[0060] During the sintering and feeding process, a 6-meter-long pressure roller is arranged, with a baffle height of 800mm. The material layer thickness is controlled at 800mm. The pressure roller is slightly convex and its height is adjusted hydraulically. A material surface height measuring instrument is installed directly above the trolley after the pressure roller has pressed the material, 85cm away from the baffles on both sides of the trolley, and at the center of the trolley. When the measured material surface height is 800-864mm, the opening of the small gate and the pressure of the pressure roller are intelligently controlled by a computer based on the average measurement results of the material surface height measuring instrument to ensure that the total material layer thickness is 800mm.

[0061] Along the sintering machine's operating direction, all air boxes 5 on both the left and right sides are equipped with 3 sets of vertical baffles 2 (6 sets in total), and a fixed vertical baffle 2 is installed on the middle connecting beam 3. Along the sintering machine's operating direction, an air-blocking horizontal baffle 1 is installed between the 5th and 6th air boxes 5, and the angle between the 6 sets of vertical baffles 2 for each of the 1st to 5th air boxes and the horizontal direction is 50°; an air-blocking horizontal baffle 1 is installed between the 10th and 11th air boxes 5, and the angle between the 6 sets of vertical baffles 2 for each of the 7th to 10th air boxes 5 and the horizontal direction is 85°; an air-blocking horizontal baffle 1 is installed between the 15th and 16th air boxes 5, and... Furthermore, the angle between the six sets of vertical baffles 2 for wind distribution in each of the 11th to 15th wind boxes 5 and the horizontal direction is 90°; an air-insulating horizontal baffle 1 is installed between the 20th and 21st wind boxes 5, and the angle between the six sets of vertical baffles 2 for wind distribution in each of the 16th to 20th wind boxes 5 and the horizontal direction is 90°; an air-insulating horizontal baffle 1 is installed between the 25th wind box 5 and the tail sealing plate, and the angle between the six sets of vertical baffles 2 for wind distribution in each of the 21st to 25th wind boxes 5 and the horizontal direction is 70°.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of uniform sintering of air volume, characterized by, Includes the following steps: Step 1: During the sintering and bottom material laying process, a hydraulic leveling roller is arranged. The material leveling height measuring instrument is installed directly above the trolley after the leveling roller has leveled the material, 20-100cm away from the side baffles of the trolley, and at the center of the trolley. The control valve of the bottom material trough and the pressure of the leveling roller are linked and controlled by the computer and the average measurement result of the material leveling height measuring instrument. Step 2: During the sintering and feeding process, after the mud roller feeds the material by controlling the opening of the small gate, the pressing roller is arranged. The material level height measuring instrument is installed directly above the trolley after the pressing roller presses the material, 20-100cm away from the side baffles of the trolley, and at the center of the trolley. The opening of the small gate and the pressure of the pressing roller are linked and controlled by the computer with the average measurement results of the material level height measuring instrument. Step 3: During the sintering exhaust process, wind equalization vertical baffles (2) are set at the inlet of the left and right wind boxes (5) at the bottom of the same car and on the middle connecting beam (3), and wind-blocking horizontal baffles (1) are set on the partition beam (4) between the wind boxes (5) and the wind boxes (5) along the running direction of the car.

2. The method for uniform sintering air volume according to claim 1, characterized in that, The angles of the vertical baffle (2) on the connecting beam (3) and the horizontal baffle (1) on the partition beam (4) in step three are not adjustable. The angles of the vertical baffle (2) on the left and right sides of the trolley and the horizontal direction are independently adjusted by computer, and the adjustment angles of the vertical baffle (2) on each side of the trolley are kept consistent.

3. The method for uniform sintering air volume according to claim 2, characterized in that, In step three, the number of wind equalization vertical baffles (2) on each side of the wind box (5) is configured according to the width of the wind box (5) and is greater than or equal to two; the spacing of the wind equalization vertical baffles (2) on each side of the wind box (5) is set according to the width of the wind box (5), and the wind equalization vertical baffles (2) on both sides of the wind box (5) are symmetrically arranged.

4. The method for uniform sintering air volume according to claim 2, characterized in that, The adjustment angle range of each wind-equalizing vertical baffle (2) with the horizontal direction is 40°~90°.

5. The method for uniform sintering air volume according to claim 1, characterized in that, In step three, the windproof horizontal baffle (1) is set along the running direction of the sintering machine. It is set on the partition beam (4) between the wind box (5) and the next wind box (5) at one-fifth, two-fifths, three-fifths, and four-fifths of the total number of wind boxes (5), and between the last wind box (5) and the sealing plate at the tail of the sintering machine.

6. The method for uniform sintering air volume according to claim 1, characterized in that, The flat roller and the pressure roller are convex in shape.

7. The method for uniform sintering air volume according to claim 1, characterized in that, The pressure roller is adjustable in height via hydraulic pressure.

8. The method for uniform sintering air volume according to claim 1, characterized in that, The width of the pressure roller is equal to the width of the material surface on the trolley.

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