A large-scale vertical magnesium reduction furnace without a dome

Abstract

The present invention relates to the technical field of reduction furnaces for producing magnesium metal, and in particular to a large-scale magnesium metal vertical tank reduction furnace without an arch, wherein the reduction furnace has a plurality of furnace chambers, the furnace chambers have a horizontal furnace roof structure, a plurality of rows of vertical tanks are arranged inside the furnace chamber along the length direction of the reduction furnace, the horizontal furnace roof structure is composed of a plurality of prefabricated blocks, the edge of the horizontal furnace roof structure is placed on the upper edge of the furnace wall, a supporting column is arranged below the connection of adjacent prefabricated blocks, the prefabricated blocks are provided with a wedge-shaped matching opening that is wide at the top and narrow at the bottom at the position corresponding to the vertical tank, the outer wall of the vertical tank is provided with an assembly set at the contact point with the horizontal furnace roof structure, the assembly set has a wedge-shaped area, and the shape of the wedge-shaped area matches the wedge-shaped matching opening. By setting a horizontal furnace roof structure composed of prefabricated blocks, the furnace wall and the supporting columns jointly support the prefabricated blocks, the stability of the horizontal furnace roof structure is ensured, and a wedge-shaped matching opening that is wide at the top and narrow at the bottom and an assembly set of the vertical tank are arranged in the horizontal furnace roof structure, so that the sealing performance is better.

Description

Technical Field

[0001] The invention relates to the technical field of reduction furnaces for producing metal magnesium, and in particular to a large-scale vertical tank reduction furnace for metal magnesium without a dome. Background Art

[0002] In industry, magnesium smelting technology mainly refers to thermal reduction methods represented by the Pidgeon process. The traditional Pidgeon process uses a horizontal tank reduction furnace, but the automation and continuity of horizontal tank production are extremely poor, and the production capacity is low. In addition, due to the large span of the horizontal tank, the tank body is prone to sinking, bending and deformation in a high temperature environment, shortening the service life of the tank body. In view of this, in recent years, vertical tank reduction furnaces have begun to be used in production to solve the problems of the above-mentioned horizontal tank reduction furnaces.

[0003] The vertical tank reduction furnace has a structure where the reduction tank is placed vertically inside the furnace chamber, and a center tube is set inside the vertical tank. During production, the overhead crane is first used to add the pellets to the area between the tank body and the center tube, and then the crystallizer and lid are installed in sequence to reduce the pellets at a temperature of 1200°C. After the reaction is completed, the furnace cover is opened, and the crystallizer is first removed using the overhead crane, and then the center tube is lifted out using the overhead crane. At the same time, a material collecting trolley is used at the bottom of the furnace to collect the slag flowing out from the bottom of the vertical tank. After the slag is removed, the center tube and materials are put back in for a circulating operation. The vertical tank reduction furnace eliminates the manual slagging operation, which greatly improves the production continuity of the magnesium reduction furnace, and the size of the vertical tank continues to increase, and the production capacity of the magnesium reduction furnace continues to increase. However, the vertical tank reduction furnace also exposes some technical difficulties in production.

[0004] Figure 1~Figure 3 The cross-sectional view of the existing vertical tank reduction furnace structure is shown. A single reduction furnace is composed of multiple furnace chambers, and different furnace chambers are separated by partition walls. The top of each furnace chamber adopts a simple arch structure, that is, a vault structure. The vault structure is extremely unstable. In order to improve the service life of the vault structure of the vertical tank reduction furnace, an integral cast vault is currently used, and a vertical tank matching port is reserved inside for the installation and removal of the vertical tank. In order to ensure the use strength of the vault, the span of the vault should not be too large, which limits each furnace chamber to accommodate a maximum of two rows of vertical tanks. Due to the limited number of vertical tanks in each furnace chamber, the output of a single chamber is limited. To increase the output, the furnace chamber can only be added to the furnace. The cost of the newly added furnace chamber is high and the floor space is larger. In addition, since the pellet material often adheres to the inner wall of the vertical tank during production, the central tube cannot be pulled out for slag discharge. At this time, the vertical tank needs to be pulled out and a new vertical tank needs to be installed to carry out production. Frequent disassembly and assembly of the vertical tank seriously reduces the service life of the vault. In production, vault collapse accidents are common, which seriously troubles production enterprises.

[0005] At the same time, the contact between the vertical tank and the top of the reduction furnace is hard contact, and there is a large gap between the two. Although fiber products are used to block the contact point during production, the blocking effect is not good. Red flames can still be seen from the gap during operation. The high-temperature flue gas in the furnace room is heated and buoyant and gathers in the space at the top of the reduction furnace, forming a positive pressure on the external environment of the reduction furnace, causing a large amount of high-temperature flue gas to overflow from the contact gap between the vertical tank and the top of the reduction furnace, causing energy loss and significantly increasing the energy consumption per ton of product.

[0006] Therefore, how to effectively prevent the top flue gas from being exposed, reduce energy consumption per ton of product, and at the same time break through the strength limitation of the arch structure is an important technical problem in the production of vertical tank reduction furnaces. Summary of the invention

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a large-scale magnesium vertical tank reduction furnace without an arch, which ensures the stability of the horizontal furnace roof structure by arranging a horizontal furnace roof structure composed of prefabricated blocks, and the prefabricated blocks are jointly supported by furnace walls and supporting columns, and a wedge-shaped matching opening with a wide upper part and a narrow lower part and an assembly set of the vertical tank are arranged in the horizontal furnace roof structure, so that the sealing performance is better.

[0008] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0009] A large-scale magnesium vertical tank reduction furnace without an arch, the reduction furnace having a plurality of furnace chambers, the furnace chambers having a horizontal furnace roof structure, a plurality of rows of vertical tanks being arranged inside the furnace chambers along the length direction of the reduction furnace, the horizontal furnace roof structure being assembled from a plurality of prefabricated blocks, the edge of the horizontal furnace roof structure being placed on the upper edge of the furnace wall, a supporting column being arranged below the connection between adjacent prefabricated blocks, the prefabricated blocks being provided with a wedge-shaped fitting opening which is wide at the top and narrow at the bottom at the position corresponding to the vertical tank, an assembly set being provided on the outer wall of the vertical tank at the contact position with the horizontal furnace roof structure, the assembly set having a wedge-shaped area, the shape of the wedge-shaped area matching the wedge-shaped fitting opening.

[0010] The original vault structure is replaced by setting up a horizontal furnace roof structure, which is composed of several prefabricated blocks and supported by furnace walls and supporting columns, ensuring the stability of the horizontal furnace roof structure, so that more than two rows of vertical tanks can be set up in a single furnace chamber, breaking through the span and strength limitations of the vault structure. A wedge-shaped matching opening with a wide top and a narrow bottom and an assembly set for the vertical tank are also set in the horizontal furnace roof structure. The vertical tank is pressed by its own gravity to tighten the gap between the assembly set and the wedge-shaped matching opening, thereby improving the sealing performance and reducing energy consumption.

[0011] Furthermore, a castable is provided above the horizontal furnace roof structure, and a boss matching opening is provided at the position of the castable corresponding to the vertical tank, the area of ​​the boss matching opening is larger than the wide opening area of ​​the wedge-shaped matching opening, and the assembly set also has a boss area, and the boss area matches the boss matching opening.

[0012] By providing the boss matching opening and the boss area, the sealing of high-temperature flue gas is further achieved.

[0013] Furthermore, the support columns are arranged between every four adjacent columns and rows of vertical tanks to form a plurality of columns of support columns, and adjacent support columns in each column of support columns are equidistantly arranged on both sides of the center line of the adjacent columns of vertical tanks.

[0014] By setting supporting columns on both sides of the center line of adjacent rows of vertical tanks, the high-temperature flue gas in the furnace room is disturbed, so that the high-temperature flue gas is distributed more evenly in the furnace room, the flow path of the high-temperature flue gas is extended, thereby improving thermal efficiency and reducing energy consumption per ton of product.

[0015] Furthermore, the centerline spacing between adjacent support columns in each column of support columns is between 50% and 100% of the length of the support columns along the horizontal direction.

[0016] By limiting the spacing between the supporting columns, the turbulence effect on the high-temperature flue gas is optimized, making the high-temperature flue gas more evenly distributed in the furnace chamber.

[0017] Furthermore, the wedge-shaped fitting opening is provided with a fiber sealing gasket.

[0018] By setting a fiber sealing gasket, the furnace top gap is further sealed, and the fiber material has a certain elasticity, so the sealing effect is better under the pressure of the assembly set.

[0019] Furthermore, the thickness of the fiber sealing gasket at the wide end of the wedge-shaped fitting opening is greater than the thickness at the narrow end of the wedge-shaped fitting opening.

[0020] By setting the wide-mouth thickness to be greater than the narrow-mouth thickness, the sealing effect on high-temperature flue gas is further optimized.

[0021] Furthermore, a splicing boss is provided on the side of the prefabricated block, and the thickness of the splicing boss is half of the thickness of the prefabricated block. The splicing bosses of adjacent prefabricated blocks are respectively arranged at the top and bottom of the side of the prefabricated block. After the splicing bosses are spliced, the top and bottom surfaces of the horizontal furnace roof structure form a horizontal plane.

[0022] By arranging a splicing boss that is spliced ​​in the vertical direction on the side of the prefabricated block, the horizontal arch structure can be spliced ​​more tightly under the influence of the gravity of the vertical tank, thereby improving the stability of the horizontal furnace roof structure.

[0023] The beneficial effects of the present invention are:

[0024] The large-scale magnesium vertical tank reduction furnace without an arch is provided with a horizontal furnace roof structure to replace the original arch structure. The horizontal furnace roof structure is composed of a plurality of prefabricated blocks and is supported by furnace walls and supporting columns, thereby ensuring the stability of the horizontal furnace roof structure, thereby realizing that more than two rows of vertical tanks can be arranged in a single furnace chamber, breaking through the limitation of the span and strength of the arch structure on the number of rows of vertical tanks in a single chamber, and realizing the large-scale magnesium vertical tank reduction furnace. Compared with the traditional reduction furnace that increases the furnace chamber to increase the output, under the same production capacity, the present invention can reduce the furnace body structure and construction area, thereby reducing the construction cost.

[0025] A wedge-shaped fitting opening, a boss fitting opening and an assembly set of a vertical tank which are wide at the top and narrow at the bottom are arranged in the horizontal furnace roof structure. The vertical tank is pressed by its own gravity to tighten the gap between the assembly set and the wedge-shaped fitting opening and the boss fitting opening. A fiber sealing gasket with a wide opening thickness greater than that of the narrow opening is also arranged, which has better sealing performance and prevents the chronic production problem of high-temperature flue gas inside the furnace chamber overflowing from the furnace roof, effectively reducing the heat dissipation of the furnace chamber to the outside and reducing energy consumption per ton of production capacity.

[0026] In addition, by arranging supporting columns on both sides of the center line of adjacent rows of vertical tanks, the high-temperature flue gas in the furnace room is disturbed, so that the high-temperature flue gas is distributed more evenly in the furnace room, and the flow path of the high-temperature flue gas is extended, thereby improving thermal efficiency and reducing energy consumption per ton of product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the existing vertical tank reduction furnace along the length direction of the furnace;

[0028] Figure 2 for Figure 1 Schematic diagram of the cross section at AA in the middle;

[0029] Figure 3 It is a schematic diagram of the structure of the existing vertical tank reduction furnace along the furnace width direction;

[0030] Figure 4 It is a schematic structural diagram of a large-scale vertical magnesium reduction furnace without a dome according to the present invention along the length direction of the furnace;

[0031] Figure 5 for Figure 4 Schematic diagram of the cross section at the middle BB;

[0032] Figure 6 It is a structural schematic diagram of a large-scale vertical magnesium reduction furnace without a dome according to the present invention along the furnace width direction;

[0033] Figure 7 This is a schematic diagram of a fiber sealing gasket in the present invention;

[0034] Figure 8 is a top view of the first prefabricated block in the present invention;

[0035] Fig. 9 is a top view of the second prefabricated block in the present invention;

[0036] Fig.10 is a top view of the third prefabricated block in the present invention;

[0037] Fig.11 is a top view of the fourth prefabricated block in the present invention;

[0038] Fig.12 is a top view of the fifth prefabricated block of the present invention;

[0039] Fig.13 is a top view of the sixth prefabricated block of the present invention;

[0040] Fig.14 It is a front view of the first prefabricated block in the present invention;

[0041] Fig.15 is a front view of the second prefabricated block in the present invention;

[0042] Fig.16 is a front view of the third prefabricated block of the present invention;

[0043] Fig.17 It is a front view of the fourth prefabricated block in the present invention.

[0044] In the figure: 1. furnace chamber; 2. vertical tank; 21. assembly set; 211. wedge-shaped area; 212. boss area; 3. prefabricated block; 31. first prefabricated block; 32. second prefabricated block; 33. third prefabricated block; 34. fourth prefabricated block; 35. fifth prefabricated block; 36. sixth prefabricated block; 37. splicing boss; 38. wedge-shaped fitting opening; 4. castable; 41. boss fitting opening; 5. furnace wall; 6. supporting column; 7. fiber sealing gasket; 8. heat storage chamber. DETAILED DESCRIPTION

[0045] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings through specific implementation methods. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art. The drawings of the present invention are not drawn strictly in accordance with the drawing regulations, but are schematic diagrams for clearly showing the contents of the present invention. The directional nouns such as upper and lower described in the text are all expressed as Figure 4 As a positioning reference.

[0046] Figure 4~Figure 7A large-scale vertical magnesium reduction furnace without an arch is shown, wherein the reduction furnace has a plurality of furnace chambers 1, wherein the furnace chambers 1 have a horizontal furnace roof structure, wherein a plurality of rows of vertical tanks 2 are arranged inside the furnace chambers 1 along the length direction of the reduction furnace, wherein the horizontal furnace roof structure is composed of a plurality of prefabricated blocks 3, wherein the edge of the horizontal furnace roof structure is placed on the upper edge of a furnace wall 5, wherein a supporting column 6 is arranged below the connection between adjacent prefabricated blocks 3, wherein the prefabricated blocks 3 are provided with a wedge-shaped fitting opening 38 which is wide at the top and narrow at the bottom at the position corresponding to the vertical tank 2, wherein an assembly sleeve 21 is provided on the outer wall of the vertical tank 2 at the contact position with the horizontal furnace roof structure, wherein the assembly sleeve 21 has a wedge-shaped area 211, and the shape of the wedge-shaped area 211 matches the wedge-shaped fitting opening 38.

[0047] By setting a horizontal furnace roof structure, the original vault structure is replaced. The horizontal furnace roof structure is composed of several prefabricated blocks 3 and is supported by furnace walls 5 and support columns 6, which ensures the stability of the horizontal furnace roof structure, thereby enabling a single furnace chamber 1 to be provided with more than two rows of vertical tanks 2. The span and strength limitations of the vault structure are broken through. In this embodiment, only the situation in which each furnace chamber 1 has two rows of vertical tanks 2 is shown. In actual production, more than two rows of vertical tanks 2 can be provided in a single furnace chamber 1 according to production requirements.

[0048] A wedge-shaped fitting opening 38 which is wide at the top and narrow at the bottom and an assembly sleeve 21 of the vertical tank 2 are also provided in the horizontal furnace roof structure. The vertical tank 2 is pressed by its own gravity to tighten the gap between the assembly sleeve 21 and the wedge-shaped fitting opening 38, thereby improving the sealing performance and reducing energy consumption.

[0049] Specifically, a castable 4 is provided above the horizontal furnace roof structure, and a boss matching opening 41 is provided at a position of the castable 4 corresponding to the vertical tank 2. The area of ​​the boss matching opening 41 is larger than the wide opening area of ​​the wedge-shaped matching opening 38. The assembly set 21 also has a boss area 212, and the boss area 212 matches the boss matching opening 41.

[0050] By providing the boss matching opening 41 and the boss area 212, the sealing of high-temperature flue gas is further achieved.

[0051] Specifically, the support columns 6 are arranged between every four adjacent columns and rows of vertical tanks 2 to form several columns of support columns 6 , and adjacent support columns 6 in each column of support columns 6 are equidistantly arranged on both sides of the center line of the vertical tanks 2 in adjacent columns.

[0052] By arranging support columns 6 on both sides of the center line of adjacent rows of vertical tanks 2, turbulence of the high-temperature flue gas in the furnace chamber 1 is achieved, so that the high-temperature flue gas is more evenly distributed in the furnace chamber 1 after entering the furnace chamber from the heat storage chamber 8, thereby extending the flow path of the high-temperature flue gas, thereby improving thermal efficiency and reducing energy consumption per ton of product.

[0053] Specifically, the centerline spacing between adjacent support columns 6 in each column of support columns 6 is between 50% and 100% of the length of the support columns 6 along the horizontal direction.

[0054] By limiting the spacing of the support columns 6, the turbulence effect on the high-temperature flue gas is optimized, so that the high-temperature flue gas is more evenly distributed in the furnace chamber 1. The specific size needs to be matched with the sizes of the furnace chamber 1, the vertical tank 2 and the support columns 6.

[0055] Specifically, the wedge-shaped fitting opening 38 is provided with a fiber sealing gasket 7 .

[0056] By providing the fiber sealing gasket 7, the furnace top gap is further sealed, and the fiber material has a certain elasticity, so the sealing effect is better under the pressure of the assembly sleeve 21.

[0057] Specifically, the thickness of the fiber sealing gasket 7 at the wide end of the wedge-shaped fitting opening 38 is greater than the thickness at the narrow end of the wedge-shaped fitting opening 38 .

[0058] By setting the wide-mouth thickness to be greater than the narrow-mouth thickness, the sealing effect on high-temperature flue gas is further optimized.

[0059] Specifically, the side of the prefabricated block 3 is provided with a splicing boss 37, the thickness of the splicing boss 37 is half the thickness of the prefabricated block 3, and the splicing bosses 37 of adjacent prefabricated blocks 3 are respectively arranged at the top and bottom of the side of the prefabricated block 3. After the splicing bosses 37 are spliced, the top surface and the bottom surface of the horizontal furnace roof structure form a horizontal plane.

[0060] By arranging a splicing boss 37 spliced ​​in the vertical direction on the side of the prefabricated block 3, the horizontal arch structure is spliced ​​more tightly under the influence of the gravity of the vertical tank 2, thereby improving the stability of the horizontal furnace roof structure.

[0061] More specifically, Figure 8~Figure 17 Six shapes of prefabricated blocks 3 of an embodiment of the present invention are shown, and the six prefabricated blocks 3 include a first prefabricated block 31, a second prefabricated block 32, a third prefabricated block 33, a fourth prefabricated block 34, a fifth prefabricated block 35 and a sixth prefabricated block 36. The front view of the fifth prefabricated block 35 is the same as the front view of the first prefabricated block 31, and the front view of the sixth prefabricated block 36 is the same as the front view of the second prefabricated block 32. Figure 5 The prefabricated blocks 3 are assembled into a horizontal furnace roof structure. The shape of the prefabricated blocks 3 and the specific assembly method shown are only one form of realization of the horizontal furnace roof structure. Personnel in this field can propose a variety of prefabricated block 3 shapes and assembly methods based on conventional assembly experience without violating the spirit of the present invention. These shapes and assembly methods are all within the scope of protection of the present invention.

[0062] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A large-scale magnesium metal vertical tank reduction furnace without a dome, the reduction furnace having a plurality of furnace chambers (1), characterized in that: The furnace chamber (1) has a horizontal furnace roof structure, and a plurality of rows of vertical tanks (2) are arranged inside the furnace chamber (1) along the length direction of the reduction furnace. The horizontal furnace roof structure is assembled from a plurality of prefabricated blocks (3), and the edge of the horizontal furnace roof structure is placed on the upper edge of the furnace wall (5). A supporting column (6) is arranged below the connection between adjacent prefabricated blocks (3). The prefabricated blocks (3) are provided with a wedge-shaped matching opening (38) which is wide at the top and narrow at the bottom at the position corresponding to the vertical tank (2). The outer wall of the vertical tank (2) is provided with an assembly sleeve (21) at the contact position with the horizontal furnace roof structure, and the assembly sleeve (21) has a wedge-shaped area (211), and the shape of the wedge-shaped area (211) matches the wedge-shaped matching opening (38); A castable (4) is provided above the horizontal furnace roof structure, and a boss matching opening (41) is provided at a position of the castable (4) corresponding to the vertical tank (2), the area of ​​the boss matching opening (41) is larger than the wide opening area of ​​the wedge-shaped matching opening (38), and the assembly sleeve (21) further has a boss area (212), and the boss area (212) matches the boss matching opening (41).

2. A large-scale magnesium vertical reduction furnace without a dome as claimed in claim 1, characterized in that: The supporting columns (6) are arranged between every four adjacent columns and rows of vertical tanks (2) to form a plurality of columns of supporting columns (6), and adjacent supporting columns (6) in each column of supporting columns (6) are equidistantly arranged on both sides of the center line of the adjacent columns of vertical tanks (2).

3. A large-scale magnesium vertical tank reduction furnace without a dome as claimed in claim 2, characterized in that: The distance between the center lines of adjacent support columns (6) in each row of support columns (6) is between 50% and 100% of the length of the support columns (6) in the horizontal direction.

4. A large-scale magnesium vertical reduction furnace without a dome as claimed in claim 1, characterized in that: The wedge-shaped fitting opening (38) is provided with a fiber sealing gasket (7).

5. A large-scale magnesium vertical tank reduction furnace without a dome as claimed in claim 4, characterized in that: The thickness of the fiber sealing gasket (7) at the wide end of the wedge-shaped fitting opening (38) is greater than the thickness at the narrow end of the wedge-shaped fitting opening (38).

6. A large-scale magnesium vertical reduction furnace without a dome as claimed in claim 1, characterized in that: The side of the prefabricated block (3) is provided with a splicing boss (37), the thickness of the splicing boss (37) being half the thickness of the prefabricated block (3), the splicing bosses (37) of adjacent prefabricated blocks (3) being respectively provided at the top and bottom of the side of the prefabricated block (3), and after the splicing bosses (37) are spliced ​​together, the top surface and the bottom surface of the horizontal furnace roof structure form a horizontal plane.

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