CN217465360U - Improve fire grate bar of sintering gas permeability - Google Patents
Improve fire grate bar of sintering gas permeability Download PDFInfo
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- CN217465360U CN217465360U CN202221179994.4U CN202221179994U CN217465360U CN 217465360 U CN217465360 U CN 217465360U CN 202221179994 U CN202221179994 U CN 202221179994U CN 217465360 U CN217465360 U CN 217465360U
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Abstract
The utility model discloses an improve fire grate bar of sintering gas permeability belongs to sintering technical field. The grate bars are of a prism structure, the upper part of the cross section of each prism is trapezoidal, the middle part of each prism is rectangular, the lower part of each prism is triangular, the long edges of the rectangles are respectively the lower bottom edge of the trapezoid and the bottom edge of the triangle, and the overall height of the cross section of each prism is equal to that of the long edge of the rectangle; the trapezoidal surface of the grate bar is contacted with the material, and the triangular surface is contacted with the heat insulation sleeve. The utility model provides the high gas permeability of sinter bed improves the distribution of bottom air current, has reduced the erosion of surplus problem of sintering thick bed production bottom heat to platform truck bottom radiation shield and grate bar itself, not only improves sintering technical index, still can reduce the grate bar loss.
Description
Technical Field
The utility model relates to an improve fire grate bar of sintering gas permeability belongs to sintering technical field.
Background
The air permeability of the sinter bed is measured by the volume or velocity (m/s) of gas per second per square meter of the air draft area of the sintering machine under a certain air draft negative pressure, or by the resistance of a certain thickness of the sinter bed per unit area of the grate bar when a certain amount of air passes through the sinter bed per unit time. Under a certain air quantity, the smaller the negative pressure of the air box is, the smaller the corresponding resistance is, and the better the air permeability is. The air permeability of the sinter bed is improved, the vertical speed of sintering can be improved, and the sintering machine is one of the main means for increasing the yield of the sintering machine.
The automatic heat accumulation phenomenon of a material layer exists in the sintering process, the condition that the heat of materials on the upper portion is insufficient and the heat of the lower portion is excessive generally exists, particularly along with the technical development of a thick material layer, the phenomenon is more prominent, the air permeability of the middle and lower portions of a sintered cake is rapidly worsened, the heat is excessive and serious, the bottom sintered cake is over-melted and even is bonded with a trolley grate bar, the grate bar is hardened under the action of high temperature, erosion and the like, the resistance of sintering smoke passing through the grate bar is obviously increased, and in the serious condition, the machine needs to be stopped for replacing operation.
The sintering of a certain enterprise mainly uses fine-grained iron ore concentrate as a main raw material, the uniform mixing and granulating effects in the production process are deviated, the air permeability in the sintering process is low, particularly after a thick material layer technology is adopted, the material layer is increased by 120mm, the sintering negative pressure is obviously increased, the air leakage rate is aggravated, the sintering end point lag is serious, the burning loss of a grate bar is serious, and the improvement of various sintering indexes is influenced.
Therefore, it is urgently needed to improve the air permeability of a material layer in the sintering process, reduce the negative pressure in the sintering process, improve the air flow distribution and improve the utilization coefficient of the sintering machine.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a improve fire grate bar of sintering gas permeability. The utility model can increase the air permeability index of the sinter bed, improve the vertical speed and improve the utilization coefficient by improving the structure of the grate bar; meanwhile, the temperature of the bottom of the sintering material layer is reduced, and the consumption of the grate bars is reduced.
The utility model adopts the technical proposal that:
a grate bar for improving sintering air permeability is of a prismatic structure, the upper part of the section of a prism is trapezoidal, the middle part of the section of the prism is rectangular, the lower part of the section of the prism is triangular, the long edges of the rectangle are respectively the lower bottom edge of the trapezoid and the bottom edge of the triangle, and the overall height of the section of the prism is equal to that of the long edges of the rectangle; the trapezoidal surface of the grate bar is contacted with the material, and the triangular surface is contacted with the heat insulation sleeve.
The lower part of the grate bar is in a triangular structure in contact with the heat insulation sleeve, so that the contact area of the grate bar and the heat insulation sleeve is reduced, the heat conduction is reduced, and the function of protecting equipment is achieved.
The height of the trapezoid of the prism section is equal to the height of the triangle. Is more beneficial to the air permeability of the sinter bed.
The utility model provides a weight of single grate bar is about 6kg, utilizes artifical transport, change, and it is convenient to change.
In the device, the length of the grate bars is 485 mm; the upper bottom of the upper trapezoid is 26mm, the lower bottom is 30mm, and the height is 2 mm; the rectangular size in the middle of the grate bar is 26mm multiplied by 30 mm; the lower bottom of the triangle at the lower part of the grate bar is 30mm and the height is 2 mm. The size design ensures the porosity of unit area and ensures the air permeability of the whole material layer.
The utility model provides an improve fire grate bar of sintering gas permeability, the beneficial effect who brings:
(1) the air permeability index of the sinter bed is increased, the vertical speed is improved, and the utilization coefficient is improved.
(2) The oxidizing atmosphere in the sintering process is improved, and the FeO content of the bottom sintering cake is reduced.
(3) The temperature of the bottom of the sintering material layer is reduced, the consumption of the grate bars is reduced, and the production cost is saved.
The present invention will be further explained with reference to the drawings and examples.
Drawings
Fig. 1 is a schematic structural view of the grate bar of the present invention.
Fig. 2 is a cross-sectional view taken along line a-a of fig. 1.
In the figure: 1 is the upper part of the grate bar, 2 is the middle part of the grate bar, and 3 is the lower part of the grate bar.
Detailed Description
Example (b):
as shown in fig. 1-2, a grate bar for improving sintering air permeability is a prismatic structure, the section of the prism is composed of three structures, the upper part 1 of the grate bar is trapezoidal, the middle part 2 of the grate bar is rectangular, the lower part 3 of the grate bar is triangular, the long sides of the rectangle are respectively the lower bottom side of the trapezoid and the bottom side of the triangle, and the whole height of the cross section of the prism is equal to that of the long side of the rectangle; the trapezoidal surface of the grate bar is contacted with the material, and the triangular surface is contacted with the heat insulation sleeve.
The lower part of the grate bar is in a triangular structure in contact with the heat insulation sleeve, so that the contact area of the grate bar and the heat insulation sleeve is reduced, the heat conduction is reduced, and the function of protecting equipment is achieved.
The utility model provides a weight of single grate bar is about 6kg, utilizes artifical transport, change, and it is convenient to change.
In the device, the length of the grate bars is 485 mm; the upper bottom of the upper trapezoid is 26mm, the lower bottom is 30mm, and the height is 2 mm; the rectangular size in the middle of the grate bar is 26mm multiplied by 30 mm; the bottom of the triangle at the lower part of the grate bar is 30mm, and the height is 2 mm. The size design ensures the porosity of unit area and ensures the air permeability of the whole material layer.
450m for a certain steel mill 2 Before improvement of the sintering machine, the length of an original furnace grate bar is 490mm, the section of the original furnace grate bar is a square with the size of 30mm multiplied by 30mm, and the original furnace grate bar is of a standard quadrangular structure. In order to improve sintering permeability, the structure of the material is improved according to the figures 1-2; the data after trial are as follows:
before implementation: the laminar air permeability index of the sinter layer is 318, the turbulent air permeability index is 132, the mean value of FeO is 9.85 percent, the rotating drum Index (ISO) is 82.18 percent, and the utilization coefficient is 1.09t/h.m 2 And the grate bars are seriously damaged from the appearance; after the implementation: laminar flow ventilation index of the sinter layer is 369, turbulent flow ventilationIndex 157, FeO mean 9.65%, drum Index (ISO) 82.38%, using a factor of 1.15t/h.m 2 And the integrity of the grate bars is better from the appearance, and according to statistics, the grate bar loss of the ton ore is reduced by 56.3 per ten thousand t.
Claims (3)
1. The utility model provides an improve fire grate bar of sintering gas permeability, is prismatic structure, its characterized in that: the upper part of the cross section of the prism is trapezoidal, the middle part of the cross section of the prism is rectangular, the lower part of the cross section of the prism is triangular, the long edge of the rectangle is respectively superposed with the lower bottom edge of the trapezoid and the bottom edge of the triangle, and the overall height of the cross section of the prism is equal to that of the long edge of the rectangle; the trapezoidal surface of the grate bar is contacted with the material, and the triangular surface is contacted with the heat insulation sleeve.
2. The grate bar for improving sintering gas permeability of claim 1, wherein: the height of the trapezoid of the prism section is equal to the height of the triangle.
3. The grate bar for improving sintering gas permeability of claim 1, wherein: the length of the grate bars is 485 mm; the upper bottom of the upper trapezoid is 26mm, the lower bottom is 30mm, and the height is 2 mm; the rectangular size in the middle of the grate bar is 26mm multiplied by 30 mm; the bottom of the triangle at the lower part of the grate bar is 30mm, and the height is 2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221179994.4U CN217465360U (en) | 2022-05-17 | 2022-05-17 | Improve fire grate bar of sintering gas permeability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221179994.4U CN217465360U (en) | 2022-05-17 | 2022-05-17 | Improve fire grate bar of sintering gas permeability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217465360U true CN217465360U (en) | 2022-09-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221179994.4U Active CN217465360U (en) | 2022-05-17 | 2022-05-17 | Improve fire grate bar of sintering gas permeability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217465360U (en) |
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2022
- 2022-05-17 CN CN202221179994.4U patent/CN217465360U/en active Active
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