Fluidized furnace dispersion plate and fluidized furnace including same

Abstract

To provide a fluidized furnace dispersion plate and a fluidized furnace including the same, which eliminate the need for maintenance and repair of a plurality of nozzles, are lightweight, and can be easily replaced partially, thereby improving maintenance and repair efficiency and minimizing maintenance and repair time, thereby improving the operation rate and efficiency of the fluidized furnace. [Solution] The fluidized furnace distribution plate of the present invention is a fluidized furnace distribution plate located inside a fluidized furnace for reducing fine ore, and is characterized in that it includes a plurality of support beams that cross the interior of the fluidized furnace and are supported on the inner wall of the fluidized furnace, and a plurality of grid plates welded to the plurality of support beams to form a single distribution plate.

Description

[Technical Field]

[0001] This description relates to a fluidized furnace distributor plate and a fluidized furnace including the same. [Background technology]

[0002] Generally, a smelting reduction ironmaking facility that directly uses fine ore to produce molten iron has a plurality of fluidized furnaces for fluidized reduction of the fine ore. The fluidized bed furnace reduces iron ore fines, which are powdered iron ore, into reduced iron using high-temperature reducing gas supplied from the melter-gasifier.

[0003] Conventional fluidized furnaces are equipped with a fluidized furnace distribution plate (DISTRIBUTION PLATE OF FLUDIZED FURNACE) equipped with multiple nozzles through which reducing gas passes. The conventional fluidized furnace distribution plate includes refractory material that crosses the interior of the fluidized furnace, a guide pipe that penetrates the refractory material, and multiple nozzles attached to the guide pipe. High-temperature reducing gas passes through the nozzles of the fluidized furnace distribution plate, fluidizing the fine ore charged to the upper part of the interior of the fluidized furnace and reducing the fine ore to fine reduced iron. However, conventional fluidized bed furnace dispersion plates have the problem that adhesive dust contained in the reducing gas adheres to the inner surface of the nozzles, narrowing or clogging the nozzle outlets, requiring regular cleaning or replacement of multiple nozzles over long periods of time.

[0004] Furthermore, in the conventional fluidized furnace dispersion plate, columns for supporting the refractory material are installed between the fluidized furnace dispersion plate and the bottom of the fluidized furnace in order to support the weight of the refractory material itself, which has the problem of limiting the flow rate of the reducing gas supplied to the lower part of the fluidized furnace. Furthermore, in the case of a conventional fluidized bed furnace dispersion plate, if the refractory material supporting the multiple nozzles is damaged, it is not easy to repair the refractory material, which reduces the functionality of the entire dispersion plate. Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a fluidized furnace distributor plate and a fluidized furnace including the same, which eliminates the need for maintenance and repair of multiple nozzles, is lightweight, facilitates partial replacement, improves maintenance and repair efficiency, minimizes maintenance and repair time, and improves the fluidized furnace operating rate and efficiency. [Means for solving the problem]

[0006] The fluidized bed furnace distribution plate of the present invention is located inside a fluidized bed furnace for reducing fine ore, and is characterized in that it includes a plurality of support beams supported on the inner wall of the fluidized bed furnace across the inside of the fluidized bed furnace, and a plurality of grid plates welded to the plurality of support beams to form a single distribution plate.

[0007] The plurality of support beams may include a plurality of first beams spaced apart from one another along one direction and supported on the inner wall of the fluidized bed furnace, and a plurality of second beams connecting the plurality of first beams along the one direction. The plurality of first beams may be H-shaped beams. The first beams preferably have a greater thickness than the second beams.

[0008] The plurality of grid plates may include a plurality of outer plates disposed outside the one dispersion plate along the inner wall of the fluidized bed furnace, and a plurality of inner plates disposed inside the one dispersion plate adjacent to the plurality of outer plates. The inner plates preferably have the same shape.

[0009] The outer plates preferably have a different shape from the inner plates. The outer plates may have a plurality of first nozzle holes, and the inner plates may have a plurality of second nozzle holes having a different shape from the first nozzle holes. The plurality of first nozzle holes preferably have an inclined shape with respect to the vertical direction. The plurality of second nozzle holes may have a triangular shape centered on the vertical direction.

[0010] Adjacent grid plates of the plurality of grid plates may be spaced apart from each other on the support beam. The furnace may further include a plurality of brackets fixed to the inner wall of the fluidized bed furnace along a circumferential direction of the inner wall of the fluidized bed furnace. The support beams are preferably fixed to the brackets. The fluidized bed furnace may further include an upper support ring connecting upper portions of the brackets along a circumferential direction of the inner wall of the fluidized bed furnace.

[0011] The furnace may further include a lower support ring spaced apart from the upper support ring with the brackets interposed therebetween and connecting lower portions of the brackets along a circumferential direction of the inner wall of the fluidized bed furnace. It is preferable that a first refractory is located above the upper support ring, a second refractory is located below the lower support ring, and the upper support ring, the plurality of brackets, and the lower support ring are disposed between the first refractory and the second refractory. The furnace may further include ceramic ropes positioned between the upper support ring and the first refractory and between the lower support ring and the second refractory. The plurality of grid plates may comprise stainless steel.

[0012] The fluidized furnace of the present invention includes a fluidized furnace body for reducing fine ore, and a fluidized furnace dispersion plate located inside the fluidized furnace body, the fluidized furnace dispersion plate including a plurality of support beams supported on the inner wall of the fluidized furnace body across the inside of the fluidized furnace body, and a plurality of grid plates welded to the plurality of support beams to form a dispersion plate. The plurality of grid plates may comprise stainless steel. [Effects of the Invention]

[0013] According to the present invention, there is provided a fluidized furnace distributor plate and a fluidized furnace including the same, which eliminate the need for maintenance and repair of multiple nozzles, are lightweight, and are easily replaced, thereby improving maintenance and repair efficiency and minimizing maintenance and repair time, thereby improving the fluidized furnace operating rate and efficiency. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view of a fluidized bed furnace according to an embodiment, cut vertically; [Figure 2] FIG. 2 is a vertical cross-sectional view showing part A in FIG. [Figure 3] 1 is a perspective view showing the underside of a fluidized bed furnace dispersion plate included in a fluidized bed furnace according to an embodiment; [Figure 4] 1 is a plan view showing the upper side of a fluidized bed furnace dispersion plate included in a fluidized bed furnace according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art will be able to easily understand and practice the present invention. As those skilled in the art may realize various different forms, the present invention is not limited to the embodiments set forth herein. For clarity of explanation of the present invention, unnecessary parts have been omitted, and the same or similar components have been given the same reference numerals throughout the specification. Furthermore, throughout the specification, when a part is said to "comprise" a certain element, unless otherwise specified, it means that it may further include other elements, not excluding other elements.

[0016] A fluidized bed furnace according to one embodiment will be described below with reference to FIGS. According to one embodiment, the fluidized furnace may be one of a plurality of fluidized furnaces included in a smelting reduction iron making facility that reduces fine iron ore, which is powdered iron ore, to reduced iron. For example, the smelting reduction iron making facility may be one of a plurality of fluidized furnaces that reduce fine iron ore to fine reduced iron, and may include a known agglomeration device that compresses the fine reduced iron to produce compacted iron agglomerates, such as a known melter-gasifier. Fine iron ore is charged into the fluidized furnace, and the fine reduced iron reduced from the fluidized furnace is produced as compacted iron agglomerates in the agglomeration device and supplied to the melter-gasifier together with coal briquettes to produce molten iron. The reducing gas generated from the melter-gasifier is supplied to the fluidized furnace.

[0017] Figure 1 is a vertically cut perspective view of a fluidized bed furnace according to an embodiment. The fluidized bed furnace shown in Figure 1 is a view showing the lower portion of the fluidized bed furnace where a fluidized bed dispersion plate is located, and the overall shape of the fluidized bed furnace may have various known shapes. Figure 2 is a vertical cross-sectional view of part A of Figure 1. Referring to FIGS. 1 and 2, a fluidized furnace 1000 includes a fluidized furnace body 100 and a fluidized furnace distributor plate 200 .

[0018] The fluidized furnace body 100 forms an internal space IS in which fine ore is reduced. The fluidized furnace body 100 has a cylindrical shape, but is not limited to this and may have various known shapes. A fluidized furnace dispersion plate 200 is located below the internal space IS of the fluidized furnace body 100. Fine ore is charged to the upper side of the fluidized furnace body 100 based on the fluidized furnace dispersion plate 200, and reducing gas is supplied to the lower side of the fluidized furnace body 100. The reducing gas supplied to the lower side of the fluidized furnace body 100 is sprayed toward the fine ore located above the fluidized furnace dispersion plate 200, and a fluidized bed is formed above the fluidized furnace dispersion plate 200. The fluidized bed distribution plate 200 distributes the reducing gas supplied to the lower side of the fluidized bed distribution plate 200 to the fine ore located above the fluidized bed distribution plate 200. The fluidized bed distribution plate 200 includes a plurality of support beams 210, a plurality of grid plates 220, a plurality of brackets 230, an upper support ring 240, a lower support ring 250, and a ceramic rope 260.

[0019] FIG. 3 is a perspective view showing the underside of a fluidized bed furnace dispersion plate included in a fluidized bed furnace according to one embodiment. 3, 1, and 2, a plurality of support beams 210 are arranged across the interior of the fluidized furnace 1000, which is the internal space IS formed by the fluidized furnace body 100, and are supported on the inner wall of the fluidized furnace 1000. The plurality of support beams 210 are fixed to a plurality of brackets 230 and supported on the inner wall of the fluidized furnace 1000, but are not limited thereto and may be fixed to the inner wall of the fluidized furnace 1000 using various support means.

[0020] The plurality of support beams 210 includes a plurality of first beams 211 and a plurality of second beams 212 . The plurality of first beams 211 are supported on the inner wall of the fluidized furnace 1000 at intervals along one direction. Here, the one direction may be, but is not limited to, a diameter direction crossing the circumference formed by the inner wall of the fluidized furnace 1000. The plurality of first beams 211 may be, but is not limited to, H-shaped beams. The plurality of first beams 211 have a greater thickness than the plurality of second beams 212. Here, the thickness of the first beam 211 may include the vertical length of the first beam 211. The plurality of first beams 211 may be, but is not limited to, eight H-shaped beams each 1000 mm thick.

[0021] The plurality of second beams 212 connect the plurality of first beams 211 along one direction that intersects with the plurality of first beams 211. The plurality of second beams 212 may be, but is not limited to, H-shaped beams. The plurality of second beams 212 have a smaller thickness than the plurality of first beams 211. Here, the thickness of the second beam 212 may include the length of the second beam 212 in the vertical direction. The plurality of second beams 212 may be, but is not limited to, 42 H-shaped beams with a thickness of 300 mm. A plurality of grid plates 220 are welded to the surface of the H-shaped beam that forms the plurality of first beams 211 and the plurality of second beams 212 .

[0022] FIG. 4 is a plan view showing the upper side of a fluidized bed furnace dispersion plate included in a fluidized bed furnace according to one embodiment. 4, 1, and 2, a plurality of grid plates 220 are welded to a plurality of support beams 210 to form a single dispersion plate. The plurality of grid plates 220 includes a plurality of outer plates 221 arranged on the outside of a single dispersion plate along the circumference formed by the inner wall of the fluidized bed furnace 1000, and a plurality of inner plates 222 located inside the plurality of outer plates 221.

[0023] The outer plates 221 are arranged outside a single distribution plate composed of the grid plates 220 along the inner wall of the fluidized furnace 1000. The outer plates 221 have different shapes from the inner plates 222. The outer plates 221 may have different shapes corresponding to the circumference formed by the inner wall of the fluidized furnace 1000, but are not limited to this. The outer plates 221 include a plurality of first nozzle holes 221a through which the reducing gas passes. The first nozzle holes 221a have a different shape from the second nozzle holes 222a disposed in the inner plates 222. The first nozzle holes 221a are configured to face the inner wall of the fluidized furnace 1000 and are inclined in an inclined direction ID with respect to a vertical direction VD along which the second nozzle holes 222a face. The number of first nozzle holes 221a may be, but is not limited to, 112.

[0024] The plurality of inner plates 222 are adjacent to the plurality of outer plates 221 and are disposed inside one dispersion plate formed by the plurality of grid plates 220. The plurality of inner plates 222 have the same diamond shape, but are not limited to this. The plurality of inner plates 222 have a plurality of second nozzle holes 222a through which the reducing gas passes. The plurality of second nozzle holes 222a have a shape different from the plurality of first nozzle holes 221a disposed in the plurality of outer plates 221. The plurality of second nozzle holes 222a face in the vertical direction VD and have a triangular shape centered on the vertical direction VD. The plurality of second nozzle holes 222a may be, but are not limited to, 331 and spaced apart at a pitch of 350 mm. Since the multiple first nozzle holes 221a are inclined in the inclination direction ID toward the inner wall of the fluidized furnace 1000 and the multiple second nozzle holes 222a are oriented in the vertical direction VD, the reducing gas passing through the multiple first nozzle holes 221a and the multiple second nozzle holes 222a is dispersed over an even wider area above the fluidized furnace dispersion plate 200.

[0025] Adjacent grid plates 220 of the plurality of grid plates 220 including a plurality of outer plates 221 and a plurality of inner plates 222 are spaced apart from each other at a set interval GA on the support beam 210 . The grid plates 220 include stainless steel. By way of example, the grid plates 220 may include, but are not limited to, SUS304H standard stainless steel. The grid plates 220 may also include SUS316, SUS310S, SUS321, and 800H standard stainless steel.

[0026] The grid plates 220 are made of stainless steel, and adjacent grid plates 220 among the grid plates 220 are spaced apart at a set interval GA on one support beam 210, thereby preventing the grid plates 220 from interfering with each other due to thermal expansion. The number of grid plates 220 may be, but is not limited to, 62. In addition, the support beams 210, the brackets 230, the upper support ring 240, and the lower support ring 250 may be made of stainless steel of SUS304H standard, but are not limited thereto, and may also be made of stainless steel of SUS316, SUS310S, SUS321, or 800H standard.

[0027] 1 to 3, a plurality of brackets 230 are fixed to the inner wall of the fluidized furnace 1000 along the circumferential direction of the inner wall of the fluidized furnace 1000. The plurality of brackets 230 form the framework of the fluidized furnace dispersion plate 200 and are fixed to the inner wall of the fluidized furnace 1000. A plurality of support beams 210 are fixed to the plurality of brackets 230, and the plurality of support beams 210 are fixed to the plurality of brackets 230 by welding. The plurality of brackets 230 may include, but is not limited to, 100 brackets 230.

[0028] The upper support ring 240 connects the upper portions of the plurality of brackets 230 along the circumferential direction of the inner wall of the fluidized bed furnace 1000. The upper support ring 240 is fixed to the upper portions of the plurality of brackets 230 by welding, but is not limited thereto, and the plurality of brackets 230 may be fitted and fixed between the upper support ring 240 and the lower support ring 250. The lower support ring 250 is spaced apart from the upper support ring 240, sandwiching the brackets 230, and connects the lower portions of the brackets 230 along the circumferential direction of the inner wall of the fluidized bed furnace 1000. The lower support ring 250 is fixed to the lower portions of the brackets 230 by welding, but is not limited thereto, and the brackets 230 may be fitted between the lower support ring 250 and the upper support ring 240 to fix them.

[0029] For example, referring to FIG. 3, four support grooves 251 spaced apart from one another are formed on the lower part of the lower support ring 250, and the four support grooves 251 are fitted into four protrusions formed on the inner wall of the fluidized bed furnace 1000 to fix them. A known variety of first refractories CM1 may be located above the upper support ring 240, and a known variety of second refractories CM2 may be located below the lower support ring 250. The upper support ring 240, the plurality of brackets 230, and the lower support ring 250, which form the framework of the fluidized furnace dispersion plate 200, are preferably located between the first refractories CM1 and the second refractories CM2.

[0030] 2, the ceramic rope 260 is located between the upper support ring 240 and the first refractory CM1 and between the lower support ring 250 and the second refractory CM2. When the upper support ring 240 and the lower support ring 250 are thermally expanded, the ceramic rope 260 is pressed against the first refractory CM1 and the second refractory CM2, respectively, thereby sealing the gap between the fluidized furnace distributor plate 200 and the inner wall of the fluidized furnace 1000.

[0031] As described above, the fluidized furnace distributor plate 200 included in the fluidized furnace 1000 according to one embodiment includes a plurality of support beams 210 and a plurality of grid plates 220 welded to the plurality of support beams 210 to form a single distributor plate. Therefore, if adhesive dust contained in the reducing gas adheres to the plurality of grid plates 220 or if some of the plurality of grid plates 220 are damaged, the surfaces of the plurality of grid plates 220 can be cleaned or only the damaged portion of the plurality of grid plates 220 can be replaced with new grid plates 220, thereby improving the efficiency of maintenance and repair of the fluidized furnace distributor plate 200 and minimizing the maintenance and repair time.

[0032] Furthermore, in the fluidized furnace 1000 according to one embodiment, the fluidized furnace distributor plate 200 includes a plurality of grid plates 220 that are lighter than those made of conventional refractory materials. Therefore, there is no need to install pillars between the fluidized furnace distributor plate 200 and the bottom of the fluidized furnace 1000 to support the weight of the plurality of grid plates 220, and a decrease in the flow rate of the reducing gas supplied to the lower part of the fluidized furnace 1000 is suppressed. That is, the fluidized furnace dispersion plate 200 and the fluidized furnace 1000 including the same are provided, which eliminate the need for maintenance and repair of multiple nozzles, are lightweight, and facilitate partial replacement, thereby improving maintenance and repair efficiency and minimizing maintenance and repair time, thereby improving the fluidized furnace operating rate and efficiency.

[0033] Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention as specified in the following claims also fall within the scope of the present invention. [Explanation of symbols]

[0034] 100 Fluidized furnace body 200 Fluidized fluidized furnace distribution plate 210 Support Beam 211 First Beam 212 Second Beam 220 Grid Plate 221 Outer Plate 221a No. 1 nozzle hole 222 Inner Plate 222a No. 2 nozzle hole 230 Bracket 240 Upper support ring 250 Lower Support Ring 251 Support groove 260 Ceramic Rope 1000 Fluidized Furnace CM1 1st refractory CM2 2nd refractory ID tilt direction IS interior space GA interval VD vertical direction

Claims

1. In a fluidized furnace dispersion plate located inside a fluidized furnace for reducing fine ore, a plurality of support beams extending across the interior of the fluidized bed furnace and supported on the inner wall of the fluidized bed furnace; and The fluidized bed furnace dispersion plate comprises a plurality of grid plates welded to the plurality of support beams to form a dispersion plate.

2. The plurality of support beams include: a plurality of first beams supported on the inner wall of the fluidized bed furnace at intervals along one direction; a plurality of second beams connecting the plurality of first beams along the one direction; 2. The fluidized bed furnace dispersion plate according to claim 1, comprising:

3. 3. The fluidized bed furnace dispersion plate according to claim 2, wherein the first beams are H-shaped beams.

4. 3. The fluidized bed furnace dispersion plate according to claim 2, wherein the first beams have a greater thickness than the second beams.

5. The plurality of grid plates include: a plurality of outer plates disposed outside the one dispersion plate along the inner wall of the fluidized bed furnace; 2. The fluidized bed furnace dispersion plate according to claim 1, further comprising a plurality of inner plates disposed adjacent to the plurality of outer plates and inside the one dispersion plate.

6. 6. The fluidized bed furnace dispersion plate according to claim 5, wherein the plurality of inner plates have the same shape.

7. 7. The fluidized bed furnace dispersion plate according to claim 6, wherein the outer plates have a different shape from the inner plates.

8. the outer plates each have a first nozzle hole; 6. The fluidized bed furnace dispersion plate according to claim 5, wherein the inner plates have a plurality of second nozzle holes having a different shape from the first nozzle holes.

9. 9. The fluidized bed furnace dispersion plate of claim 8, wherein the first nozzle holes are inclined with respect to the vertical direction.

10. 9. The fluidized bed furnace dispersion plate of claim 8, wherein the plurality of second nozzle holes have a triangular shape centered on the vertical direction.

11. 2. The fluidized bed furnace dispersion plate according to claim 1, wherein adjacent ones of said plurality of grid plates are spaced apart from each other on said support beam.

12. The fluidized furnace dispersion plate according to claim 1 , further comprising a plurality of brackets fixed to the inner wall of the fluidized furnace along the circumferential direction of the inner wall of the fluidized furnace.

13. 13. The fluidized bed furnace dispersion plate according to claim 12, wherein the plurality of support beams are fixed to the plurality of brackets.

14. 13. The fluidized bed furnace distributor plate according to claim 12, further comprising an upper support ring connecting upper portions of the brackets along the circumferential direction of the inner wall of the fluidized bed furnace.

15. 15. The fluidized bed furnace dispersion plate of claim 14, further comprising a lower support ring spaced apart from the upper support ring across the brackets and connecting lower portions of the brackets along the circumferential direction of the inner wall of the fluidized bed furnace.

16. A first refractory is located above the upper support ring, A second refractory is located below the lower support ring, 16. The fluidized bed furnace dispersion plate according to claim 15, wherein the upper support ring, the plurality of brackets, and the lower support ring are positioned between the first refractory and the second refractory.

17. 17. The fluidized bed furnace dispersion plate of claim 16, further comprising a ceramic rope positioned between the upper support ring and the first refractory and between the lower support ring and the second refractory.

18. 2. The fluidized bed furnace distributor plate of claim 1, wherein the plurality of grid plates comprise stainless steel.

19. A fluidized bed furnace body for reducing fine ore; The fluidized furnace dispersion plate located inside the fluidized furnace body Including, The fluidized bed furnace dispersion plate is a plurality of support beams that traverse the interior of the fluidized furnace body and are supported on the inner wall of the fluidized furnace body; The fluidized bed furnace comprises a plurality of grid plates welded to the plurality of support beams to form a dispersion plate.

20. 20. The fluidized bed furnace of claim 19, wherein the plurality of grid plates comprise stainless steel.

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