Cooling device and cooling system for elephant foot area of blast furnace

Abstract

The invention discloses a blast furnace elephant foot area cooling device and system. The blast furnace elephant foot area cooling device can be inserted into a heat exchange groove of a blast furnace and used for improving the heat exchange effect of the blast furnace elephant foot area and pushing the corner of an erosion contour line of the blast furnace to the center of the blast furnace, the blast furnace elephant foot area cooling device comprises a cooling main body, and a cooling channel facilitating flowing of a cooling medium is formed in the cooling main body. The face, facing the heat exchange groove, of the cooling body inclines in the direction away from the heat exchange groove from bottom to top. The cooling main body in the blast furnace elephant foot area cooling device can improve the cooling capacity of the blast furnace elephant foot area, the corner part of the erosion contour line of the blast furnace is pushed towards the center direction of the blast furnace, the erosion contour lines at other positions are not influenced, the formation of the most serious erosion area in the blast furnace elephant foot area is avoided, the erosion rate is slowed down, and the service life of the blast furnace is prolonged.

Description

Technical Field

[0001] The present application belongs to the technical field of smelting equipment, and specifically relates to a cooling device and a cooling system for a blast furnace elephant foot zone. Background Art

[0002] A blast furnace is a smelting equipment, and its lifespan is largely determined by the lifespan of the refractory materials in the hearth and furnace bottom. The corrosion shape and maintenance status of the hearth and furnace bottom will directly affect the overhaul period and overall economic benefits of the blast furnace.

[0003] Figure 1 What is shown is a partial cross-sectional view of a blast furnace in the prior art. The blast furnace hearth is used to hold molten iron, and a cooling medium is introduced into the cooling wall inside the furnace shell and into the water-cooling pipe at the furnace bottom to cool the refractory materials of the hearth and the furnace bottom.

[0004] Since the shape of a traditional blast furnace is a straight cylinder or a positive cone (small at the top and large at the bottom), the cooling structure composed of the cooling wall and the water-cooling pipe in the blast furnace will form an L-shaped cooling line in the furnace refractory and the furnace bottom refractory. The erosion contour of the blast furnace also corresponds to the cooling line, that is, the bending part of the erosion contour of the blast furnace is approximately a right angle. The erosion condition caused by this erosion contour will make the blast furnace elephant foot area (the elephant foot area refers to the right-angle connection between the furnace bottom and the furnace) the most severely eroded area. The severely eroded area becomes weak and easy to be burned through. At the same time, the refractory on the upper part of the severely eroded area is suspended due to the depression of the elephant foot area, which accelerates the falling off of the upper refractory and affects the service life of the furnace. Therefore, inventing a cooling device that can reduce the erosion of the elephant foot area of ​​blast furnaces is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides a cooling device for the elephant foot area of ​​a blast furnace on the one hand, so as to solve the technical problem in the prior art that the elephant foot area of ​​a blast furnace is the most severely corroded area, which will affect the service life of the furnace.

[0006] The technical solution adopted to achieve the purpose of this application is:

[0007] A cooling device for the elephant foot area of ​​a blast furnace can be inserted into a heat exchange slot in the elephant foot area of ​​the blast furnace, and is used to improve the heat exchange effect of the elephant foot area of ​​the blast furnace, and move the corner of the erosion contour line of the blast furnace toward the center of the blast furnace. The cooling device for the elephant foot area of ​​the blast furnace comprises:

[0008] The cooling body is used for heat exchange in the elephant foot area of ​​the blast furnace. A cooling channel is arranged inside the cooling body to facilitate the flow of cooling medium. The cooling body is inclined from bottom to top towards the direction away from the heat exchange groove on one side facing the heat exchange groove.

[0009] In order to better realize the present application, further optimization is made in the above structure, and the cooling body includes a plurality of cooling layers, and the plurality of cooling layers are stacked in sequence from bottom to top.

[0010] In order to better realize the present application, further optimization is made in the above structure, and the plurality of cooling layers form a heat-conducting surface with a stepped cross-section shape toward one end of the heat exchange groove, and the heat-conducting surface can fit tightly with the heat exchange groove.

[0011] In order to better implement the present application, further optimization is made in the above structure, and the angle between the line connecting the bottom edge of the heat-conducting surface and the top edge of the heat-conducting surface and the horizontal plane is 40°-60°.

[0012] In order to better realize the present application, further optimization is made in the above structure, and a lifting portion for facilitating lifting of the cooling layer is provided at one end of the cooling layer away from the heat exchange groove.

[0013] In order to better realize the present application, further optimization is made in the above structure, and the thermal conductivity of the cooling layer is 40 to 400 W / (m·K).

[0014] In order to better realize the present application, further optimization is made in the above structure, and a heat conducting layer is arranged between two adjacent cooling layers.

[0015] In order to better implement the present application, further optimization is made in the above structure, and the cooling layer and the heat-conducting layer are provided with thermal conductive paste.

[0016] In order to better realize the present application, further optimization is made in the above structure, and the thermal conductivity of the heat-conducting layer is 60 to 150 W / (m·K).

[0017] On the other hand, the present application also provides a blast furnace elephant foot area cooling system, which includes a plurality of the above-mentioned blast furnace elephant foot area cooling devices.

[0018] It can be seen from the above technical scheme that the cooling body in the blast furnace elephant foot area cooling device provided in the present application can be inserted into the heat exchange trough of the blast furnace, so as to improve the heat exchange effect of the blast furnace elephant foot area, push the corner of the erosion contour line of the blast furnace toward the center of the blast furnace, and will not affect the erosion contour line at other positions, thereby avoiding the blast furnace elephant foot area from forming the most severely eroded area, slowing down the erosion rate, and thus extending the life of the blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a partial cross-sectional view of a blast furnace in the prior art;

[0020] Figure 2 This is a schematic structural diagram of a cooling device for the elephant foot area of ​​a blast furnace in the present application;

[0021] Figure 3 A partial cross-sectional view of a blast furnace equipped with a cooling device for the elephant foot area of ​​a blast furnace according to the present application;

[0022] Figure 4 for Figure 3 A partial enlarged view of part A in the middle.

[0023] Description of reference numerals:

[0024] 1-cooling body, 11-cooling layer, 12-heat conducting layer;

[0025] 2- blast furnace hearth;

[0026] 3-furnace shell;

[0027] 4-Cooling wall;

[0028] 5- furnace bottom water cooling pipe;

[0029] 6- furnace refractory;

[0030] 7- furnace bottom refractory material;

[0031] 8-Erosion contour lines. DETAILED DESCRIPTION

[0032] In order to enable technicians in the technical field to which the present application belongs to understand the present application more clearly, the technical solution of the present application is described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0033] In the embodiments of the present application, Figures 2 to 4 As shown, the blast furnace elephant foot area cooling device comprises a cooling body 1; wherein,

[0034] A cooling channel is arranged inside the cooling body 1 to facilitate the flow of cooling medium. A medium inlet and a medium outlet are arranged on the outer wall of the cooling body 1. Both the medium inlet and the medium outlet are connected to the cooling channel. The side of the cooling body 1 facing the heat exchange groove is offset from bottom to top in a direction away from the heat exchange groove.

[0035] During installation, the cooling body 1 can be installed in the heat exchange tank of the blast furnace to improve the cooling effect of the elephant foot area of ​​the blast furnace, and the corner of the erosion contour line 8 of the blast furnace is pushed toward the center of the blast furnace hearth 2, that is, the bending part of the erosion contour line 8 of the blast furnace is moved toward the center of the blast furnace hearth 2 to form a smooth curve, see Figure 3 The cooling body 1 cooperates with the cooling wall 4 in the furnace shell 3 and the furnace bottom water cooling pipe 5 to exchange heat with the furnace hearth refractory 6, the furnace bottom refractory 7 and the blast furnace elephant foot area, so that the erosion contour line 8 forms a "pot bottom shape" so that the erosion of the blast furnace hearth 2 forms a "pot bottom type" erosion shape, thereby extending the service life of the hearth.

[0036] It should be noted that the above-mentioned heat exchange groove is arranged at the junction of the furnace side wall and the furnace bottom side wall and away from the center of the blast furnace hearth;

[0037] In the prior art, the common erosion shapes of blast furnaces mainly include four types: wide face type, mushroom type, elephant foot type and pot bottom type; among them, the first three types (wide face type, mushroom type and elephant foot type) are non-uniform abnormal erosion, which will eventually form the most severely eroded area in the elephant foot area of ​​the blast furnace, and after the abnormal erosion is formed in the elephant foot area of ​​the blast furnace, the erosion will be further accelerated and aggravated, affecting the service life of the blast furnace hearth 2;

[0038] The pot bottom type erosion is a uniform erosion form. Appropriate pot bottom type erosion can slow down the erosion rate and avoid the formation of depressions in the blast furnace elephant foot area, which may cause the hearth refractory material 6 above the blast furnace elephant foot area to fall off.

[0039] In some embodiments, the cooling body 1 includes a plurality of cooling layers 11, and the plurality of cooling layers 11 are stacked sequentially from bottom to top, and each cooling layer 11 is relatively independent and respectively connected to a supply end of a cooling medium;

[0040] During the operation of the blast furnace, the staff can judge the heat exchange effect of the cooling device in the elephant foot area of ​​the blast furnace by the temperature changes of the cooling medium at the medium inlet and the medium outlet on the multiple cooling layers 11, and can control the cooling intensity by controlling the flow rate, flow rate or heat exchange time of the cooling medium, so as to better adjust the erosion contour line 8 of the elephant foot area of ​​the blast furnace.

[0041] It should be noted that when a blast furnace is newly built or maintained, a heat exchange groove can be reserved on the side wall of the furnace. The heat exchange groove is set close to the bottom of the blast furnace. Figure 3 The position of the heat exchange groove corresponds to the position of the blast furnace elephant foot area, and a socket is opened at the position of the furnace shell 3 corresponding to the heat exchange groove, and the socket is connected to the heat exchange groove to facilitate the insertion and removal of the cooling body 1;

[0042] There are multiple sockets, and the sockets are arranged in sequence from bottom to top. Figure 4 , and the size of the socket matches the cross-sectional shape of the cooling layer 11, so that multiple cooling layers 11 can be inserted into the heat exchange groove in sequence through the multiple sockets.

[0043] The above-mentioned arrangement of the socket can reduce the damage to the furnace shell 3, so as to ensure the structural stability of the furnace shell 3 and make the blast furnace safer when in use.

[0044] In some embodiments, the side of the above-mentioned multiple cooling layers 11 facing the heat exchange groove is a heat-conducting surface with a stepped cross-section shape to increase the heat exchange area of ​​the cooling body 1; and the heat-conducting surface can fit tightly with the heat exchange groove, so that the cooling body 1 can contact and exchange heat with the furnace cylinder refractory material 6 and the furnace bottom refractory material 7 to improve the heat exchange effect of the cooling body 1.

[0045] In some embodiments, the angle between the line connecting the bottom edge of the above-mentioned heat-conducting surface and the top edge of the heat-conducting surface and the horizontal plane is 40°-60°, so that the cooling body 1 can push the bending part of the erosion contour line 8 toward the center of the blast furnace without affecting the erosion contour line 8 at other positions, so that the bending part of the erosion contour line 8 is more rounded and smooth, so that the elephant foot area of ​​the blast furnace forms a "pot bottom type" erosion shape.

[0046] In some embodiments, the ends of the above-mentioned multiple cooling layers 11 away from the heat exchange groove are located in the same vertical plane, and when the multiple cooling layers 11 are inserted in the heat exchange groove, the ends of the multiple cooling layers 11 away from the heat exchange groove coincide with the plane where the furnace shell 3 is located, so as to support the furnace shell 3 and at the same time, avoid the cooling layers 11 occupying the space outside the furnace shell 3.

[0047] Preferably, the cooling layer 11 is made of, but not limited to, materials with good thermal conductivity such as copper, cast iron or steel, and the thermal conductivity of the cooling layer 11 is 40 to 400 W / (m·K) to ensure good heat exchange efficiency.

[0048] In some embodiments, a lifting portion (not shown in the figure) is provided at one end of the cooling layer 11 away from the heat exchange groove. The provision of the lifting portion can facilitate the lifting of the cooling layer 11, so that the installation and disassembly of the cooling layer 11 is more convenient.

[0049] In some embodiments, a heat conducting layer 12 is disposed between two adjacent cooling layers 11, see Figure 2 The gap between two adjacent cooling layers 11 is filled with the heat-conducting layer 12 so that the two adjacent cooling layers 11 are in contact and conduct heat through the heat-conducting layer 12 to improve the heat exchange efficiency of the cooling body 1.

[0050] In addition, filling the heat-conducting layer 12 between two adjacent cooling layers 11 can prevent molten iron from penetrating into the gap between the two adjacent cooling layers 11, thereby improving the safety of the cooling body 1 when in use.

[0051] In some embodiments, a thermally conductive paste is disposed between the cooling layer 11 and the thermally conductive layer 12 to further improve the cooling efficiency of the cooling body 1 .

[0052] Preferably, the thermal conductive layer 12 includes but is not limited to graphite carbon bricks and high thermal conductive carbon bricks, and the thermal conductivity of the thermal conductive layer 12 is 60 to 150 W / (m·K).

[0053] Based on the above-mentioned blast furnace elephant foot area cooling device, this embodiment also provides a blast furnace elephant foot area cooling system, which includes multiple blast furnace elephant foot area cooling devices mentioned above. Multiple cooling devices can be arranged around the circumference of the blast furnace to improve the cooling capacity of the blast furnace elephant foot area, slow down the erosion rate, and thus extend the life of the blast furnace.

[0054] Through the above embodiments, the present application has the following beneficial effects or advantages:

[0055] 1) The cooling body 1 in the cooling device for the elephant foot area of ​​the blast furnace can be inserted into the heat exchange tank of the blast furnace to improve the cooling capacity of the elephant foot area of ​​the blast furnace, push the corner of the erosion contour line 8 of the blast furnace toward the center of the blast furnace, avoid the elephant foot area of ​​the blast furnace from forming the most severely eroded area, slow down the erosion rate, and thus extend the life of the blast furnace.

[0056] 2) The cooling body 1 includes a plurality of cooling layers 11 stacked in sequence from bottom to top. This arrangement can change the installation method of the cooling body 1 and reduce damage to the furnace shell 3 to ensure the structural stability of the furnace shell 3, making the blast furnace safer when in use.

[0057] 3) A heat-conducting layer 12 is provided between two adjacent cooling layers 11, and the heat-conducting layer 12 is used to fill the gap between the two adjacent cooling layers 11 to improve the cooling efficiency of the cooling body 1, and to prevent molten iron from penetrating into the gap between the two adjacent cooling layers 11, so as to improve the safety of the cooling body 1 when in use.

[0058] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0059] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A cooling device for the elephant foot area of ​​a blast furnace, which can be inserted into a heat exchange tank of a blast furnace, is used to improve the heat exchange effect of the elephant foot area of ​​the blast furnace, and to move the corner of the erosion contour line (8) of the blast furnace toward the center of the blast furnace, characterized in that: include: A cooling body (1) is used for heat exchange in the foot area of ​​the blast furnace. A cooling channel is provided inside the cooling body (1) to facilitate the flow of cooling medium. The cooling body (1) is inclined from bottom to top towards a direction away from the heat exchange groove on one side facing the heat exchange groove.

2. The cooling device for the elephant foot area of ​​a blast furnace according to claim 1, characterized in that: The cooling body (1) comprises a plurality of cooling layers (11), and the plurality of cooling layers (11) are stacked in sequence from bottom to top.

3. The cooling device for the elephant foot area of ​​a blast furnace according to claim 2, characterized in that: The side of the cooling body (1) facing the heat exchange groove is a heat conduction surface with a stepped cross-section, and the heat conduction surface can be tightly fitted with the heat exchange groove.

4. The cooling device for the elephant foot area of ​​a blast furnace according to claim 3, characterized in that: The angle between the line connecting the bottom edge of the heat conducting surface and the top edge of the heat conducting surface and the horizontal plane is 40°-60°.

5. The cooling device for the elephant foot area of ​​a blast furnace according to claim 2, characterized in that: One end of the cooling layer (11) away from the heat exchange groove is provided with a lifting portion for facilitating lifting of the cooling layer (11).

6. The cooling device for the elephant foot area of ​​a blast furnace according to claim 2, characterized in that: The thermal conductivity of the cooling layer (11) is 40 to 400 W / (m·K).

7. The cooling device for the elephant foot area of ​​a blast furnace according to claim 6, characterized in that: A heat conducting layer (12) is arranged between two adjacent cooling layers (11).

8. The cooling device for the elephant foot area of ​​a blast furnace according to claim 7, characterized in that: The cooling layer (11) and the heat conducting layer (12) are provided with heat conducting paste.

9. The cooling device for the elephant foot area of ​​a blast furnace according to claim 8, characterized in that: The thermal conductivity of the heat-conducting layer (12) is 60 to 150 W / (m·K).

10. A cooling system for the elephant foot area of ​​a blast furnace, characterized in that: The cooling device comprises a plurality of cooling devices for the elephant foot area of ​​a blast furnace as claimed in any one of claims 1 to 9.

Images