A grate bar, a sintering machine trolley and a sintering process for improving sintering air permeability

Abstract

The present invention discloses a grate bar, a sintering machine trolley and a sintering process for improving sintering air permeability, which relates to the technical field of sintering machines and solves the problems of poor air permeability of the existing sintering machine trolley, the existence of a dead material layer at the edge of the trolley, and serious thermal fatigue damage due to heat concentration on the trolley girder. The grate bar includes a grate bar body and an air inlet plate; the air inlet plate is provided with a cavity, the side wall of the air inlet plate is provided with a plurality of air inlet holes communicating with the cavity, the bottom end of the air inlet plate is provided with an exhaust passage communicating with the cavity, and the air inlet plate is arranged at the top end of the grate bar body. Among them, the exhaust port of the exhaust passage faces the grate bar body. After the air flow enters the cavity through the air inlet holes, it is discharged by the exhaust passage and flows to the opposite sides of the grate bar body; a plurality of grate bars are arranged at intervals on the sintering machine trolley; the process is realized based on the sintering machine trolley. The present invention effectively improves the sintering air permeability, further improves the sintering efficiency, increases the height of the sintering material layer, reduces the thermal fatigue damage of the trolley girder, and increases the air permeability of the edge dead material layer.

Description

Technical Field

[0001] The present invention relates to the technical field of sintering machines, and particularly relates to a grate bar, a sintering machine trolley and a sintering process for improving sintering air permeability. Background Art

[0002] The air permeability of the sintering machine trolley is greatly affected by the thickness of the sintering material. The prior art uses horizontal air permeability at the feeding part of the trolley to enhance the air permeability of the material layer. However, the air flow channels formed by this method are horizontal. Under the influence of the negative pressure suction of the sintering trolley, the effect of improving air permeability by this method is not good, resulting in a low material layer thickness. At the same time, there is a dead material layer at the edge of the trolley, and the problem of serious heat fatigue damage due to concentrated heat on the trolley girder also needs to be solved. Summary of the Invention

[0003] The purpose of the present invention is to provide a grate bar, a sintering machine trolley and a sintering process for improving sintering air permeability, so as to solve the problems of poor existing sintering air permeability, low material layer thickness, the existence of a dead material layer at the edge of the trolley, and serious heat fatigue damage due to concentrated heat on the trolley girder proposed in the above background art.

[0004] In order to achieve the above purpose, the technical solution of the present invention is as follows:

[0005] A grate bar for improving sintering air permeability, the grate bar includes a grate bar body and an air inlet plate;

[0006] The air inlet plate is provided with a cavity, the side wall of the air inlet plate is provided with a plurality of air inlet holes communicating with the cavity, the bottom end of the air inlet plate is provided with an exhaust passage communicating with the cavity, the air inlet plate is arranged at the top end of the grate bar body, wherein, the exhaust port of the exhaust passage faces the grate bar body, and after the air flow enters the cavity through the air inlet holes, it is discharged through the exhaust passage and flows to the opposite sides of the grate bar body.

[0007] Preferably, the grate bar further includes two protection plates, the upper ends of the two protection plates are respectively connected to the two side walls in the width direction of the exhaust passage, and the lower ends of the two protection plates extend in opposite directions.

[0008] Preferably, the grate bar further includes connecting beams, a plurality of the connecting beams are arranged at intervals at the bottom of the exhaust passage, and the bottom of the air inlet plate is fixedly arranged on the grate bar body through the plurality of connecting beams.

[0009] Preferably, the protection plate is provided with notches, the notches and the connecting beams are arranged in one-to-one correspondence, and both sides of the connecting beam are fixedly arranged at the notches of the same-side protection plate correspondingly.

[0010] Preferably, the outer side of the connecting beam and the outer side surface of the protection plate are in the same plane;

[0011] The bottom width of the connecting beam is greater than the width of the top surface of the grate bar body. Step grooves are provided along the length direction of the grate bar body on both opposite sides of the bottom surface of the connecting beam, and the two step grooves are respectively located on both sides of the grate bar body.

[0012] Preferably, the air inlet plate is in the shape of a rectangular plate. Air inlet holes are provided on each side wall of the air inlet plate. The air inlet holes are evenly spaced on the side wall of the air inlet plate, and the air inlet holes on the opposite side walls of the air inlet plate are oppositely arranged.

[0013] Preferably, the air inlet hole is a strip-shaped hole.

[0014] A sintering machine trolley for improving sintering air permeability includes a trolley body, and a plurality of the grate bars are arranged on the trolley body.

[0015] Preferably, the plurality of grate bars are spaced apart on the trolley body.

[0016] A wind guiding sintering process is realized based on the sintering machine trolley. The process includes:

[0017] Laying sintering materials on the sintering machine trolley so that the sintering materials cover the top end of the air inlet plate;

[0018] Starting sintering until sintering is completed. During the sintering process, the sintering machine trolley is moved to perform negative pressure air extraction under the platform of the sintering machine trolley, and air enters under the platform through the cavity of the air inlet plate and the exhaust passage.

[0019] The beneficial effects of the present invention:

[0020] As can be seen from the above technical solutions, for the grate bar disclosed in the present invention, an air inlet plate is arranged on the grate bar body. The area of the air permeable holes on the air inlet plate is much larger than the gap between adjacent grate bars, forming a short-circuit channel, which can greatly increase the air inlet quality, increase the sintering air permeability, and further improve the sintering efficiency of the sintering materials and greatly increase the height of the sintering material layer; moreover, the grate bar body can adopt the existing traditional grate bars in the workshop, and the air inlet plate can be welded on the traditional grate bars, with low cost and reasonable utilization of existing resources, without causing waste of resources;

[0021] The present invention also discloses a sintering machine trolley for improving sintering air permeability. A plurality of grate bars are laid on the sintering machine trolley. The grate bars can be spaced apart according to the use requirements. When using the sintering machine trolley for sintering, the sintering materials not only have vertical air permeability but also horizontal air permeability, effectively improving the air permeability of the sintering materials. At the same time, the cold air is directly guided to the girder of the trolley, reducing the temperature of the trolley girder and the risk of thermal fatigue fracture of the girder;

[0022] The present invention also discloses a wind-guided sintering process. Through the air inlet plate of the grate bars, the sintered material on the sintering machine trolley not only has vertical air flow channels inside, but also has multiple horizontal air flow channels. A single horizontal air flow channel is centered on the air inlet plate and is less affected by the vertical air flow channels, enabling good air permeability in both the vertical and horizontal directions of the sintered material, high sintering efficiency of the sintered material, and significantly increasing the height of the sintered material layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a cross-sectional structural schematic diagram of Embodiment 1 of the present invention;

[0025] Figure 2 It is a cross-sectional structural schematic diagram of another perspective of Embodiment 1 of the present invention;

[0026] Figure 3 It is a structural schematic diagram of Embodiment 2 of the present invention.

[0027] Reference numerals in the figures: 1 - grate bar body, 2 - air inlet plate, 3 - protective plate, 4 - connecting beam, 5 - trolley body, 6 - first grate bar, 201 - air inlet hole, 401 - stepped groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following will clearly and completely describe the technical solutions in the present embodiment in conjunction with the drawings in the present embodiment. However, this should not be construed as limiting the present invention to specific embodiments, and is only for explanation and understanding:

[0029] Embodiment 1

[0030] This embodiment provides a grate bar for improving sintering air permeability, including a grate bar body 1. The grate bar body 1 is a traditional grate bar, and the grate bar body 1 is in a plate shape. The grate bar body 1 is provided with a crossbeam clamping structure for mounting the grate bar on the trolley body 5. There is a gap between adjacent grate bars. The sintered material is arranged on the platform composed of multiple grate bars. A suction negative pressure is applied below the platform, so that after the air passes through the sintered material, it enters below the platform through the gap between adjacent grate bars. The air permeability affects the vertical sintering speed, the sintering productivity, and the quality of the sintered ore. The thickness of the sintered material is affected by the air permeability of the material layer. If the air permeability is poor, the sintering speed is slow and the quality of the sintered ore is not good. Increasing the thickness of the sintered material increases the output of the sintered ore and saves heat and reduces consumption.

[0031] Thus, referring toFigure 1 In this embodiment, the grate bar further includes an air inlet plate 2. The air inlet plate 2 can be in the shape of a plate. The air inlet plate 2 is provided with a cavity. A plurality of air inlet holes 201 communicating with the cavity are provided on the side wall of the air inlet plate 2. An exhaust passage communicating with the cavity is provided at the bottom end of the air inlet plate 2. The air inlet plate 2 is arranged at the top end of the grate bar body 1, and the air inlet plate 2 can be fixedly installed at the top end of the grate bar body 1 by welding. Among them, the exhaust direction of the exhaust passage faces the grate bar body 1. After the air flow enters the cavity through the air inlet holes 201, it is discharged through the exhaust passage and flows towards the opposite sides of the grate bar body 1.

[0032] The exhaust passage may include two exhaust ports oppositely arranged at the bottom end of the air inlet plate 2. The length directions of the two exhaust ports are both parallel to the length direction of the grate bar body 1. The thickness of the bottom end of the air inlet plate 2 is greater than the thickness of the grate bar body 1, so that the two exhaust ports respectively face the opposite sides of the grate bar body 1. When the air inlet plate 2 is installed on the trolley, the air flow can flow downward under the platform. In this embodiment, the exhaust passage only includes one exhaust port. The width of the exhaust port is greater than the thickness of the grate bar body 1. The central axis in the length direction of the grate bar body 1 is located below the central axis in the length direction of the exhaust port, so that the air flow in the exhaust passage is discharged from the gap between the grate bar body 1 and the exhaust port.

[0033] The working mode of this embodiment:

[0034] The grate bar is arranged on the trolley body 5, so that the sintering material covers the top end of the air inlet plate 2. At this time, when negative pressure is drawn under the platform, after the air flow passes through the sintering material surface, it passes through the cavity of the air inlet plate 2 to form a "short circuit" channel and finally flows into the area under the platform. The area of the air permeable holes on the air inlet plate 2 is much larger than the gap between adjacent grate bars, which can greatly increase the air inlet quality, improve the sintering air permeability, and thus improve the sintering efficiency of the sintering material. Due to the improvement of the permeability of the material layer, under the same sintering negative pressure, the height of the sintering material layer can be greatly increased. And the grate bar body 1 can adopt the existing traditional grate bar in the workshop, and the air inlet plate 2 can be welded on the traditional grate bar. The cost is low, and the existing resources are reasonably utilized without causing waste of resources.

[0035] The specific structure of the grate bar in this embodiment is as follows:

[0036] Refer to Figure 1 and Figure 2, the intake plate 2 further includes protective plates 3. The upper ends of the two protective plates 3 are respectively connected to the two side walls in the width direction of the exhaust passage, and the lower ends of the two protective plates 3 extend in opposite directions. The two ends of the two protective plates 3 are fixedly connected through two auxiliary connecting plates respectively, so that the two protective plates 3 enclose a protective hopper. At this time, the intake plate 2 can be installed at the top of the grate bar body 1 by connecting the auxiliary connecting plate to the top of the grate bar body 1. The top of the protective hopper is fixedly connected to the bottom end of the intake plate 2. The width of the protective hopper gradually increases along the direction away from the intake plate 2, so that the overall shape of the protective hopper is skirt-shaped. In this embodiment, the cross-section of the protective hopper is an isosceles trapezoid, so that the airflow discharged from the cavity can flow out from both sides of the grate bar body 1 more evenly, avoiding uneven gas flow on both sides of the grate bar body 1, and further avoiding inconsistent sintering progress of the sintered material on the platform. The bottom width of the protective hopper is greater than the thickness of the bottom end of the intake plate 2, so that the intake plate 2 can be stably installed on the grate bar body 1 and there is enough air guiding channel. At this time, the thickness of the upper part of the intake plate 2 can be designed to be smaller correspondingly, so that more sintered material can be accommodated on the platform of the sintering machine trolley.

[0037] Refer to Figure 1 and Figure 2 , the grate bar further includes connecting beams 4. A plurality of connecting beams 4 are arranged at intervals at the bottom of the exhaust passage. The bottom of the intake plate 2 is fixedly arranged on the grate bar body 1 through a plurality of connecting beams 4. Notches are provided on the protective plates 3, and the notches and the connecting beams 4 are arranged in one-to-one correspondence. The two sides of the connecting beam 4 are fixedly arranged at the notches of the same-side protective plates 3 correspondingly, and the connecting beam 4 and the protective plate 3 are welded, so that the connecting beam 4 can close the notches of the protective plates 3. At this time, the airflow passes through the gaps between adjacent connecting beams 4 and flows downward along the protective plates 3. Figure 2 In the figure, the arrow direction is the airflow direction.

[0038] Refer to Figure 2 , in this embodiment, the outer side surface of the connecting beam 4 and the outer side surface of the protective plate 3 are in the same plane, that is, the outer side of the connecting beam 4 has the same slope as the outer side of the protective plate 3, so that the outer side of the bottom end of the protective plate 3 is flat without protrusions, avoiding sintered material being stuck on the protective plate 3.

[0039] The bottom width of the connecting beam 4 is greater than the width of the top surface of the grate bar body 1. Step grooves 401 are provided along the length direction of the grate bar body 1 on both opposite sides of the bottom surface of the connecting beam 4, that is, the two step grooves 401 are respectively located on both sides of the grate bar body 1. The bottom surface of the protection plate 3 at the non-notch part is flush with the bottom of the step groove 401 to further increase the gap for air flow. When the grate bars of this embodiment are installed, the air inlet plate 2 can be erected on the top of adjacent traditional grate bars without the air inlet plate 2 through the step grooves 401, increasing the stability of the air inlet plate 2; and the width of the interval between the two step grooves 401 is greater than the width of the grate bar body 1, so that when the step grooves 401 abut against other traditional grate bars, the exhaust passage of the air inlet plate 2 will not be blocked.

[0040] Referring to Figure 1 , in this embodiment, the air inlet plate 2 is in the shape of a rectangular plate, and the air inlet holes 201 are evenly spaced on the side wall of the air inlet plate 2. The air inlet holes 201 are evenly spaced, so that the air inlet is relatively uniform, which is beneficial to the balanced sintering of the corresponding two sides of the sintering material. The air inlet plate 2 can also be set as a cylindrical shape, and the cylindrical air inlet plate occupies a smaller area.

[0041] Each side wall of the air inlet plate 2 is provided with an air inlet hole 201 to increase the air inlet area and improve the efficiency of gas passing through.

[0042] Referring to Figure 2 , in this embodiment, the air inlet holes 201 on the opposite side walls of the air inlet plate 2 are arranged opposite to each other, so that the sintering effects of the sintering materials on both sides of the air inlet plate 2 are symmetrical, further ensuring the sintering quality of the sintering material.

[0043] Referring to Figure 1 , the air inlet hole 201 is a strip-shaped hole. In this embodiment, the length direction of the strip-shaped hole is horizontal, and the width of the strip-shaped hole is not greater than 3 mm, so as to reduce the probability of the sintering material passing through the strip-shaped hole and falling into and filling the cavity, and the strip-shaped hole is not easily blocked compared with the circular hole. Even if a small amount of sintering material gets stuck in the strip-shaped hole, the strip-shaped hole still has a large remaining pore for air to pass through, which will not affect the sintering progress, and the cleaning efficiency of the strip-shaped hole is high. At the same time, since the two protection plates 3 are enclosed to form a bucket tightly against the bottom surface of the trolley, when the trolley is loading, unloading and turning over, the sintering material will not leak into the cavity of the air inlet plate 2 to block the cavity. Further improving the reliability of the use of the grate bar.

[0044] Embodiment 2

[0045] This embodiment provides a sintering machine trolley, referring to Figure 3, the sintering machine trolley includes a trolley body 5, on which a plurality of first grate bars 6 are provided. The first grate bars 6 are the traditional grate bars. On the trolley body 5, a plurality of grate bars as in Embodiment 1 are also provided. The plurality of grate bars and the traditional grate bars are laid on the trolley body 5 according to the trolley requirements. Further, the number of the first grate bars 6 spaced between adjacent grate bars is the same, so that the grate bars can be spaced on the trolley body 5.

[0046] During use, the sintering material submerges the top of the air inlet plate 2 of the grate bar, so that the air flow can pass through the sintering material and then enter the cavity of the air inlet plate 2. At this time, the sintering material not only has enhanced vertical air permeability, but also has horizontal air permeability, and the sintering efficiency is high. The sintering mixture is distributed and combined by the grate bars and the first grate bars 6, and is divided into small sintering areas in blocks. Under good air permeability, the sintering efficiency is improved, thereby increasing the output of sintered ore.

[0047] Due to the edge effect of the air flow, it is difficult for the air flow to penetrate the sintering material on both sides of the trolley, resulting in dead material corners remaining on both sides of the trolley. Moreover, the sintering heat storage mainly occurs in the middle and lower parts of the sintering material, and the trolley beam is concentratedly heated, which is extremely likely to cause thermal fatigue accidents. By arranging the grate bars on both sides and the middle of the trolley body 5, while reducing the dead material corners, the thermal fatigue damage of the trolley beam can also be reduced.

[0048] Embodiment 3

[0049] This embodiment provides a wind guiding sintering process, which includes:

[0050] Step 1: Lay the sintering material on the sintering machine trolley so that the sintering material covers the top of the air inlet plate 2;

[0051] Step 2: Start sintering until sintering is completed. During the sintering process, move the sintering machine trolley to suck air under negative pressure under the platform of the sintering machine trolley, and the air enters under the platform through the gaps between the grate bars and the exhaust channels of the air inlet plate 2.

[0052] In this embodiment, inside the sintering material on the sintering machine trolley, there are not only vertical air flow channels provided by the sintering machine trolley, but also a plurality of horizontal air flow channels provided by the air inlet plate 2. A single horizontal air flow channel is centered on the air inlet plate 2, and the air flow can enter the air inlet plate 2 in an approximately horizontal direction, so that there are a plurality of horizontal air flow channels inside the sintering material on the sintering machine trolley. And because there are a plurality of grate bars, the air permeability of the sintering material in the horizontal direction is less affected by the vertical air flow channels. Therefore, in Step 2, the sintering material has good air permeability in both the vertical and horizontal directions, and the sintering efficiency of the sintering material is high.

[0053] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A grate bar for improving sintering air permeability, characterized in that, The grate bar includes a grate bar body and an air inlet plate; The air inlet plate is provided with a cavity, and a plurality of air inlet holes communicating with the cavity are provided on the side wall of the air inlet plate. An exhaust passage communicating with the cavity is provided at the bottom end of the air inlet plate. The air inlet plate is arranged at the top end of the grate bar body. Among them, the exhaust port of the exhaust passage faces the grate bar body. After the air flow enters the cavity through the air inlet holes, it is discharged through the exhaust passage. The air flow in the exhaust passage is discharged from the gap between the grate bar body and the exhaust port, so that the air flow flows to the opposite sides of the grate bar body; The grate bar further includes two protection plates. The upper ends of the two protection plates are respectively connected to the two side walls in the width direction of the exhaust passage. The lower ends of the two protection plates extend in opposite directions; the two ends of the two protection plates are respectively fixedly connected by two auxiliary connecting plates, so that the two protection plates enclose a protection hopper. The air inlet plate is installed at the top end of the grate bar body by connecting the auxiliary connecting plate to the top end of the grate bar body. The top end of the protection hopper is fixedly connected to the bottom end of the air inlet plate. The width of the protection hopper gradually increases along the direction away from the air inlet plate, so that the overall shape of the protection hopper is skirt-shaped; The grate bar further includes connecting beams. A plurality of the connecting beams are arranged at intervals at the bottom of the exhaust passage. The bottom of the air inlet plate is fixedly arranged on the grate bar body through a plurality of the connecting beams; notches are provided on the protection plates, and the notches and the connecting beams are arranged in one-to-one correspondence. The two sides of the connecting beam are fixedly arranged at the notches of the protection plates on the same side correspondingly. Among them, the air flow passes through the gap between adjacent connecting beams and flows downward along the protection plates.

2. The grate bar for improving sintering air permeability according to claim 1, wherein, The outer side of the connecting beam and the outer side surface of the protection plate are in the same plane. The bottom surface width of the connecting beam is greater than the width of the top surface of the grate bar body. Step grooves are provided on both sides of the bottom surface of the connecting beam along the length direction of the grate bar body, and the two step grooves are respectively located on both sides of the grate bar body.

3. The grate bar for improving sinter permeability according to claim 1, characterized in that, The air inlet plate is in the shape of a rectangular plate. Each side wall of the air inlet plate is provided with air inlet holes. The air inlet holes are arranged at equal intervals on the side wall of the air inlet plate. The air inlet holes on the opposite side walls of the air inlet plate are arranged oppositely.

4. The grate bar for improving sintering air permeability according to claim 1, characterized in that, The air inlet hole is a strip-shaped hole.

5. A sintering machine trolley for improving sintering air permeability, characterized in that, It includes a trolley body, and a plurality of the grate bars as described in any one of claims 1-4 are arranged on the trolley body.

6. The sintering machine trolley for improving sintering air permeability according to claim 5, characterized in that A plurality of the grate bars are arranged at intervals on the trolley body.

7. A wind guiding sintering process, characterized in that, The air guiding sintering process is realized based on the sintering machine trolley described in claim 4 or 5. The process includes: Laying the sintering material on the sintering machine trolley so that the sintering material covers the top end of the air inlet plate; Starting sintering until sintering is completed. During the sintering process, move the sintering machine trolley to make negative pressure air extraction under the platform of the sintering machine trolley, and air enters under the platform through the cavity and the exhaust passage of the air inlet plate.

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