A cooling structure for a reduction furnace body and a reduction furnace

Abstract

This invention discloses a cooling structure for a reduction furnace body and a reduction furnace, belonging to the technical field of ironmaking equipment. To improve the service life of the reduction furnace, the cooling structure of the furnace body includes a cooling wall layer (1), which contains multiple cooling wall blocks (101). Upper copper cooling strips (2) are stacked and connected to the upper part of the inner surface of each cooling wall block (101), and lower copper cooling strips (4) are stacked and connected to the lower part of the inner surface of each cooling wall block (101). The upper side of the upper copper cooling strip (2) is higher than or equal to the upper side of the cooling wall block (101) to which it is connected, and the lower side of the lower copper cooling strip (4) is lower than or equal to the lower side of the cooling wall block (101) to which it is connected. The cooling structure of the reduction furnace body enhances the cooling effect of the gap between two adjacent cooling wall blocks and the upper and lower edges of the cooling walls, thereby extending the cooling life of the reduction furnace body.

Description

Technical Field

[0001] This invention relates to the field of ironmaking equipment technology, specifically a cooling structure for a reduction furnace body, or a reduction furnace itself. Background Technology

[0002] Ensuring high efficiency and long service life of blast furnaces is a major concern for ironmaking workers. Based on years of practical experience in the ironmaking industry, it is believed that the hearth and high-heat-load areas of the furnace body are key factors affecting blast furnace lifespan. These factors manifest as erosion of the refractory materials in the hearth and hearth, and damage to the cooling equipment in the high-heat-load areas, respectively. While the latter does not directly lead to blast furnace shutdown and major overhaul like the former, it still has a significant impact on the blast furnace.

[0003] The high-heat-load areas of the furnace body (belly, waist, and lower part) operate under extremely harsh conditions. They are subjected to the scouring of high-temperature gas and slag, as well as the impact of high temperatures and fluctuating heat flows. Given poor raw material conditions, they are also susceptible to corrosion from alkali metals and zinc. The refractory materials in this area are easily corroded; based on operational experience, the brick lining in this section has a service life of only 0.5 to 1 year. Therefore, during a generation of furnace service, this area relies heavily on cooling equipment for most of the time. The key to extending the service life of this area lies in achieving rapid and stable slag crust formation through appropriate cooling intensity and a reasonable cooling structure.

[0004] The damage investigation of the high heat load area shows that the brick lining at the edge of the cooling wall blocks is relatively severely worn. This is mainly because the thermal conductivity of the refractory filler filling the gaps between the cooling wall blocks is relatively low compared to the cooling wall itself, and it is greatly affected by construction. The gaps between the cooling wall blocks and their sides become weak links, which is a factor affecting the efficiency and longevity of the blast furnace. Summary of the Invention

[0005] To improve the service life of reduction furnaces (such as blast furnaces), this invention provides a cooling structure for the furnace body and a reduction furnace. The cooling structure for the furnace body enhances the cooling effect between two adjacent cooling wall blocks and along the upper and lower edges of the cooling wall blocks, thereby extending the service life of the blast furnace cooling equipment and thus extending the service life of the blast furnace.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A cooling structure for a reduction furnace body includes a cooling wall layer containing multiple cooling wall blocks. An upper copper cooling strip is stacked and connected to the upper part of the inner surface of the cooling wall block, and a lower copper cooling strip is stacked and connected to the lower part of the inner surface of the cooling wall block. The upper side of the upper copper cooling strip is higher than or equal to the upper side of the cooling wall block to which the upper copper cooling strip is connected, and the lower side of the lower copper cooling strip is lower than or equal to the lower side of the cooling wall block to which the lower copper cooling strip is connected.

[0008] The length direction of the upper copper cooling bar is the same as the circumference of the reduction furnace body. The upper copper cooling bar is provided with an upper cooling water channel, which contains a rising section, a horizontal section and a falling section connected in sequence.

[0009] The outer surface of the upper copper cooling strip is connected to a cooling water outer pipe. The interior of the cooling water outer pipe is connected to the upper cooling water inner channel. The cooling water outer pipe is formed by welding copper pipe and steel pipe. The inner surface of the upper copper cooling strip is provided with multiple first strip-shaped grooves.

[0010] The inner surface of the cooling wall block is provided with an upper mounting groove, and the upper copper cooling strip is matched and set in the upper mounting groove. The height of the upper copper cooling strip is 15%-30% of the height of the cooling wall block, and the upper copper cooling strip is connected to a temperature measuring thermocouple.

[0011] Along the circumference of the reduction furnace body, the length of the upper copper cooling strip is less than or equal to the length of the cooling wall block, and the upper copper cooling strip and the cooling wall block are arranged alternately.

[0012] Along the circumference of the reduction furnace body, the gap between two adjacent upper copper cooling bars is filled with refractory filler; along the axial direction of the reduction furnace body, the gap between the upper and lower copper cooling bars connecting two adjacent cooling wall blocks is filled with refractory filler, or the upper and lower copper cooling bars connecting two adjacent cooling wall blocks are connected as one unit.

[0013] A cooling wall block connects an upper copper cooling strip and a lower copper cooling strip that are symmetrical and mirror images of each other. The lower copper cooling strip has a channel for lower cooling water.

[0014] A central copper cooling strip is stacked and connected in the middle of the inner surface of the cooling wall block. The length direction of the central copper cooling strip is the same as the circumference of the reduction furnace body, and the height of the central copper cooling strip is less than or equal to the height of the upper copper cooling strip.

[0015] The central copper cooling strip has a central cooling water channel that extends circumferentially along the furnace body of the reduction furnace. The inner surface of the central copper cooling strip has multiple second strip-shaped grooves, and the central copper cooling strip is connected to a temperature measuring thermocouple.

[0016] A reduction furnace includes a furnace body containing a refractory material layer, a cooling structure, and a furnace shell arranged sequentially from the inside out. The cooling structure is the same as the cooling structure of the reduction furnace body described above.

[0017] The beneficial effects of this invention are:

[0018] 1. Temperature measuring thermocouples are installed on the cooling wall blocks and copper cooling strips to determine the working status in real time.

[0019] 2. The installation of copper cooling bars enhances the cooling effect of the gap between two adjacent cooling wall blocks, and the upper and lower copper cooling bars are used to enhance the cooling effect of the upper and lower edges of the cooling wall, thereby extending the service life of the cooling equipment and thus extending the service life of the blast furnace.

[0020] 3. The cooling water external pipe can be made of copper or copper pipe plus steel pipe, which helps to reduce investment.

[0021] 4. Set up independent cooling systems, and the cooling intensity can be adjusted according to the production conditions, which increases the means of production adjustment of the reduction furnace and facilitates the production operation of the reduction furnace. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0023] Figure 1 This is a cross-sectional schematic diagram of the reduction furnace body described in this invention.

[0024] Figure 2 yes Figure 1 Enlarged diagram of the middle section.

[0025] Figure 3 This is an enlarged schematic diagram of the cooling wall block portion within the cooling wall layer.

[0026] Figure 4 It is along Figure 3 A schematic diagram of the direction A in the middle.

[0027] Figure 5 It is along Figure 4 A schematic diagram of the B direction.

[0028] Figure 6 This is a schematic diagram of the upper cooling water channel in the upper copper cooling strip.

[0029] Figure 7 This is a schematic diagram showing that the inner surface of the central copper cooling strip has a textured mesh finish.

[0030] Figure 8 This is a schematic diagram showing that the inner surface of the central copper cooling strip has a second strip-shaped groove.

[0031] The annotations in the attached figures are explained as follows:

[0032] 1. Cooling wall layer; 2. Upper copper cooling bar; 3. Middle copper cooling bar; 4. Lower copper cooling bar; 5. Refractory filler; 6. Refractory material layer; 7. Cooling structure; 8. Furnace shell; 9. Copper cooling bar water supply and return pipelines; 10. Cooling wall water supply and return pipelines;

[0033] 101. Cooling wall block; 102. Upper mounting slot; 103. Axial water channel;

[0034] 201. Upper cooling water inner channel; 202. Rising section; 203. Horizontal section; 204. Falling section; 205. Cooling water outer pipe; 206. Mesh texture; 207. First strip groove; 208. Copper pipe; 209. Steel pipe;

[0035] 301. Internal cooling water channel in the middle section; 302. Second strip-shaped groove. Detailed Implementation

[0036] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] A cooling structure for a reduction furnace body includes a cooling wall layer 1, which contains multiple cooling wall blocks 101. Upper copper cooling strips 2 are stacked and connected to the upper part of the inner surface (the surface facing the interior of the reduction furnace body) of each cooling wall block 101, and lower copper cooling strips 4 are stacked and connected to the lower part of the inner surface of each cooling wall block 101. The upper side of the upper copper cooling strip 2 is higher than or equal to the upper side of the cooling wall block 101 to which it is connected, and the lower side of the lower copper cooling strip 4 is lower than or equal to the lower side of the cooling wall block 101 to which it is connected. Figures 1 to 4 As shown.

[0038] In the cooling wall layer 1, multiple cooling wall blocks 101 are arranged in regular rows and columns. For example, multiple cooling wall blocks 101 can be arranged in regular rows and columns facing each other. The gap between two adjacent cooling wall blocks 101 is filled with refractory filler 5. The gap between two adjacent cooling wall blocks 101 includes circumferential extension gaps and axial extension gaps. The upper copper cooling strip 2 and the lower copper cooling strip 4 are set close to the circumferential extension gaps. The upper copper cooling strip 2 and the lower copper cooling strip 4 first enhance the cooling effect of the circumferential extension gaps between two adjacent upper and lower cooling wall blocks and the upper and lower edges of a single cooling wall block, thereby extending the service life of the cooling structure and equipment.

[0039] In this embodiment, the cooling wall block 101 has a rectangular plate-like structure, and the material of the cooling wall block can be cast iron or cast steel. The upper copper cooling strip 2 has a long strip-like structure. The length direction of the cooling wall block 101 is approximately the same as the axial direction of the reduction furnace body, and the length direction of the upper copper cooling strip 2 is the same as the circumferential direction of the reduction furnace body. One cooling wall block 101 can be connected to one upper copper cooling strip 2 and one lower copper cooling strip 4. The upper copper cooling strip 2 and the lower copper cooling strip 4 are arranged vertically at intervals, such as... Figures 1 to 4 As shown.

[0040] In this embodiment, the upper copper cooling strip 2 is provided with an upper cooling water channel 201, which includes a rising section 202, a horizontal section 203, and a descending section 204 connected in sequence, such as... Figure 6 As shown, the distance from the horizontal segment 203 to the upper side of the upper copper cooling strip 2 is less than the distance from the horizontal segment 203 to the lower side of the upper copper cooling strip 2. The lower copper cooling strip 4 is provided with a lower cooling water channel, and the upper cooling water channel 201 of the adjacent upper copper cooling strip 2 and the lower cooling water channel of the lower copper cooling strip 4 are connected.

[0041] In this embodiment, a cooling water outer pipe 205 is connected to the outer surface of the upper copper cooling strip 2. The cooling water outer pipe 205 is integrated with the upper cooling water inner channel 201. The cooling water outer pipe 205 passes through the cooling wall block 101, and the interior of the cooling water outer pipe 205 communicates with the upper cooling water inner channel 201. The cooling water outer pipe 205 can be made of copper pipe 208, or it can be formed by welding copper pipe 208 and steel pipe 209. The inner surface of the upper copper cooling strip 2 (the surface facing the interior of the reduction furnace body) can be provided with multiple first strip-shaped grooves 207 (the cross-section can be rectangular or trapezoidal). Alternatively, the inner surface of the upper copper cooling strip 2 can be provided with a mesh textured surface 206. This can be compared and referenced. Figures 7 to 8 As shown.

[0042] In this embodiment, the inner surface of the cooling wall block 101 is provided with an upper mounting groove 102. The depth of the upper mounting groove 102 is less than the thickness of the upper copper cooling strip 2. A portion of the upper copper cooling strip 2 is matched and disposed in the upper mounting groove 102. The height of the upper copper cooling strip 2 is 15%-30% of the height of the cooling wall block 101. Both the upper copper cooling strip 2 and the lower copper cooling strip 4 are connected to a temperature measuring thermocouple.

[0043] In this embodiment, along the circumference of the reduction furnace body, the length of the upper copper cooling strip 2 is less than or equal to the length of the cooling wall block 101. The upper copper cooling strip 2 and the cooling wall block 101 are arranged alternately, that is, each upper copper cooling strip 2 is installed across two adjacent cooling wall blocks 101 on the left and right, and each upper copper cooling strip 2 covers a portion of the two adjacent cooling wall blocks 101 on the left and right, such as... Figure 4 As shown, the upper copper cooling strip 2 can cover a section of axially extending gap between two adjacent cooling wall blocks 101, and the upper copper cooling strip 2 enhances the cooling effect of the gap between the two adjacent cooling wall blocks 101.

[0044] In this embodiment, refractory filler 5 is filled in the gap between two adjacent upper copper cooling bars 2 along the circumferential direction of the reduction furnace body; along the axial direction of the reduction furnace body ( Figure 1In the vertical direction, the gap between the upper copper cooling strip 2 and the lower copper cooling strip 4 connecting two adjacent cooling wall blocks 101 is filled with refractory filler 5, or the upper copper cooling strip 2 and the lower copper cooling strip 4 connecting two adjacent cooling wall blocks 101 are connected as one unit. The cooling effect is better when the upper copper cooling strip 2 and the lower copper cooling strip 4 are connected as one unit. Figures 1 to 5 As shown.

[0045] In this embodiment, the structures of the upper copper cooling strip 2 and the lower copper cooling strip 4 connected to a cooling wall block 101 can be the same or different. The upper copper cooling strip 2 and the lower copper cooling strip 4 connected to a cooling wall block 101 are symmetrical and mirror images of each other (or they may not be mirror images of each other). Preferably, the upper side of the upper copper cooling strip 2 is equal to the upper side of the cooling wall block 101 to which it is connected, that is, the upper side of the upper copper cooling strip 2 is flush with the upper side of the cooling wall block 101 to which it is connected; the lower side of the lower copper cooling strip 4 is equal to the lower side of the cooling wall block 101 to which it is connected, that is, the lower side of the lower copper cooling strip 4 is flush with the lower side of the cooling wall block 101 to which it is connected. Figure 2 As shown.

[0046] In this embodiment, a central copper cooling strip 3 is stacked and connected in the middle of the inner surface of the cooling wall block 101. The central copper cooling strip 3 is also a long strip-shaped structure. The length direction of the central copper cooling strip 3 is the same as the circumferential direction of the reduction furnace body. The height of the central copper cooling strip 3 is less than or equal to the height of the upper copper cooling strip 2. The distance from the central copper cooling strip 3 to the upper copper cooling strip 2 is the same as the distance from the central copper cooling strip 3 to the lower copper cooling strip 4. The central copper cooling strip 3 can be provided or not provided as needed. A central mounting groove is provided in the middle of the inner surface of the cooling wall block 101, and a lower mounting groove is provided in the lower part of the inner surface of the cooling wall block 101. The central copper cooling strip 3 is matched and set in the central mounting groove, and the lower copper cooling strip 4 is matched and set in the lower mounting groove.

[0047] An upper copper cooling strip 2, a middle copper cooling strip 3, and a lower copper cooling strip 4, all connected to a cooling wall block 101, form a copper cooling strip unit. A gap exists between the middle copper cooling strip 3 and both the upper and lower copper cooling strips 2 and 4. In one copper cooling strip unit, the left sides of the upper copper cooling strip 2, the middle copper cooling strip 3, and the lower copper cooling strip 4 are flush; similarly, the right sides of the upper copper cooling strip 2, the middle copper cooling strip 3, and the lower copper cooling strip 4 are flush. Figure 4 As shown.

[0048] Each central copper cooling strip 3 and lower copper cooling strip 4 is installed across two adjacent cooling wall blocks 101, covering a portion of the two adjacent cooling wall blocks 101. The central copper cooling strip 3 and lower copper cooling strip 4 also cover a section of the axially extending gap between two adjacent cooling wall blocks 101, thus enhancing the cooling effect of the gap between the two adjacent cooling wall blocks 101. Both the central copper cooling strip 3 and lower copper cooling strip 4 are connected to external cooling water pipes 205, which pass through the cooling wall block 101. The external cooling water pipes 205 can be made of copper pipe 208, or they can be formed by welding copper pipe 208 and steel pipe 209. Figures 7 to 8 As shown.

[0049] In this embodiment, a central cooling water channel 301 is provided within the central copper cooling strip 3. The central cooling water channel 301 extends circumferentially along the furnace body of the reduction furnace. The flow areas of the upper cooling water channel 201, the lower cooling water channel, and the central cooling water channel 301 are the same. A temperature measuring thermocouple is connected to the central copper cooling strip 3. The inner surface of the central copper cooling strip 3 (the surface facing the interior of the reduction furnace body) is provided with multiple second strip-shaped grooves 302 (the cross-section can be rectangular or trapezoidal), or the inner surface of the central copper cooling strip 3 is provided with a mesh-like textured surface 206.

[0050] In this embodiment, the cooling wall block 101 is provided with multiple axial water channels 103. The axial water channels 103 in two adjacent cooling wall blocks 101 are connected in a one-to-one correspondence. The cooling wall block 101 is connected to a temperature measuring thermocouple. Along the circumference of the reduction furnace body, the gaps between two adjacent upper copper cooling bars 2 are filled with refractory filler 5, the gaps between two adjacent middle copper cooling bars 3 are filled with refractory filler 5, and the gaps between two adjacent lower copper cooling bars 4 are filled with refractory filler 5. The refractory filler 5 can be existing carbon or silicon carbide ramming or casting materials with good thermal conductivity.

[0051] The following describes a reduction furnace, comprising a furnace body, which is a vertical cylindrical structure. The furnace body contains, from the inside out, a refractory material layer 6, a cooling structure 7, and a furnace shell 8, arranged sequentially. The cooling structure 7 is the cooling structure of the aforementioned reduction furnace body. The reduction furnace can be any vessel capable of a reduction reaction, such as a blast furnace or a reduction melting furnace. The space between the cooling structure 7 and the furnace shell 8 can be filled with self-flowing castable refractory or pressure-injected slurry. The refractory material layer 6 can be inlaid refractory bricks, cast refractory material, or sprayed refractory material.

[0052] The cooling structure of the reduction furnace body also includes copper cooling bar water supply and return pipelines 9 and cooling wall water supply and return pipelines 10, which are independent of each other. Along the axial direction of the furnace body, the upper cooling water channel of the upper copper cooling bar 2, the middle cooling water channel of the middle copper cooling bar 3, and the lower cooling water channel of the lower copper cooling bar 4 are connected in series from bottom to top and then connected to the copper cooling bar water supply and return pipeline 9. The copper cooling bar water supply and return pipeline 9 can supply cooling water to the upper copper cooling bar 2, the middle copper cooling bar 3, and the lower copper cooling bar 4. Along the axial direction of the furnace body, the axial water channels 103 of each row of cooling wall blocks 101 are connected in series from bottom to top and then connected to the cooling wall water supply and return pipeline 10. The cooling wall water supply and return pipeline 10 can supply cooling water to the cooling wall blocks 101.

[0053] For ease of understanding and description, this invention uses absolute positional relationships for description. Unless otherwise specified, the directional term "above" indicates... Figure 4 The direction above, the directional word "down" indicates Figure 4 The lower side of the middle, the directional word "left" indicates Figure 4 The left side of the direction, the directional word "right" indicates Figure 4 The direction is to the right. This invention is described from the perspective of the reader or user, but the above directional terms should not be understood or interpreted as limiting the scope of protection of this invention.

[0054] The above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this patent should still fall within the scope of this patent. Furthermore, the technical features, technical solutions, and embodiments of the present invention can be freely combined and used together.

Claims

1. A cooling structure for a reduction furnace body, characterized in that, The cooling structure of the reduction furnace body includes a cooling wall layer (1), which contains multiple cooling wall blocks (101). The upper part of the inner surface of the cooling wall block (101) is connected with an upper copper cooling strip (2), and the lower part of the inner surface of the cooling wall block (101) is connected with a lower copper cooling strip (4). The height of the upper side of the upper copper cooling strip (2) is greater than or equal to the height of the upper side of the cooling wall block (101) to which the upper copper cooling strip (2) is connected, and the height of the lower side of the lower copper cooling strip (4) is less than or equal to the height of the lower side of the cooling wall block (101) to which the lower copper cooling strip (4) is connected. The inner surface of the cooling wall block (101) is provided with an upper mounting groove (102), and the upper copper cooling strip (2) is matchedly set in the upper mounting groove (102). The height of the upper copper cooling strip (2) is 15%-30% of the height of the cooling wall block (101), and the upper copper cooling strip (2) is connected to a temperature measuring thermocouple. Along the circumference of the reduction furnace body, the length of the upper copper cooling strip (2) is less than or equal to the length of the cooling wall block (101), and the upper copper cooling strip (2) and the cooling wall block (101) are arranged alternately.

2. The cooling structure of the reduction furnace body according to claim 1, characterized in that, The length direction of the upper copper cooling bar (2) is the same as the circumferential direction of the reduction furnace body. The upper copper cooling bar (2) is provided with an upper cooling water channel (201). The upper cooling water channel (201) contains a rising section (202), a horizontal section (203) and a falling section (204) connected in sequence.

3. The cooling structure of the reduction furnace body according to claim 2, characterized in that, The outer surface of the upper copper cooling strip (2) is connected to a cooling water outer pipe (205). The interior of the cooling water outer pipe (205) is connected to the upper cooling water inner channel (201). The cooling water outer pipe (205) is formed by welding copper pipe (208) and steel pipe (209). The inner surface of the upper copper cooling strip (2) is provided with multiple first strip grooves (207).

4. The cooling structure of the reduction furnace body according to claim 1, characterized in that, Along the circumference of the reduction furnace body, the gap between two adjacent upper copper cooling bars (2) is filled with refractory filler (5); along the axial direction of the reduction furnace body, the gap between the upper copper cooling bar (2) and the lower copper cooling bar (4) connected by two adjacent cooling wall blocks (101) is filled with refractory filler (5), or the upper copper cooling bar (2) and the lower copper cooling bar (4) connected by two adjacent cooling wall blocks (101) are connected as one unit.

5. The cooling structure of the reduction furnace body according to claim 1, characterized in that, A cooling wall block (101) connects an upper copper cooling strip (2) and a lower copper cooling strip (4) which are symmetrical and mirror images of each other. The lower copper cooling strip (4) has a lower cooling water channel inside.

6. The cooling structure of the reduction furnace body according to claim 1, characterized in that, A central copper cooling strip (3) is stacked and connected in the middle of the inner surface of the cooling wall block (101). The length direction of the central copper cooling strip (3) is the same as the circumferential direction of the reduction furnace body. The height of the central copper cooling strip (3) is less than or equal to the height of the upper copper cooling strip (2).

7. The cooling structure of the reduction furnace body according to claim 6, characterized in that, The central copper cooling strip (3) is provided with a central cooling water channel (301), which extends along the circumference of the reduction furnace body. The inner surface of the central copper cooling strip (3) is provided with multiple second strip grooves (302), and the central copper cooling strip (3) is connected to a temperature measuring thermocouple.

8. A reduction furnace, characterized in that, The reduction furnace includes a furnace body, which contains a refractory material layer (6), a cooling structure (7), and a furnace shell (8) arranged sequentially from the inside to the outside. The cooling structure (7) is the cooling structure of the reduction furnace body as described in claim 1.

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