Plate-wall combined cooling structure and plate-wall combined furnace lining blast furnace

Abstract

The utility model belongs to the technical field of metallurgy, and particularly provides a plate wall combined cooling structure which comprises a cooling wall and a plurality of cooling plates. A fire-resistant lining is arranged on the hot surface of the cooling wall; a plurality of preformed holes matched with the cooling plate are formed in the cooling wall; a plurality of mounting grooves are formed in the refractory lining; the mounting grooves are in one-to-one correspondence with the preformed holes; and one end of the cooling plate penetrates through the preformed hole and is inserted into the mounting groove. Through the mutual cooperation of the cooling plate and the cooling wall, the cooling blind area is eliminated, the cooling uniformity is improved, and the overall cooling strength is enhanced, so that stable protective slag crust can be formed on the hot surface of the lining, and the long-term reliable work of the cooling equipment is realized. In addition, the furnace shell can be effectively prevented from becoming red and even being burnt through due to gas channeling in the furnace. The structure is wide in application range, can be used for all areas of a blast furnace hearth, a tuyere, a bosh, a bosh and a furnace body, and is favorable for prolonging the service life of each area.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgy, and in particular relates to a plate-wall combined cooling structure and a plate-wall combined lining blast furnace. Background Art

[0002] Production practice has confirmed that the cooling structure of the blast furnace is a key factor in determining the life of the blast furnace, which includes cooling equipment and refractory lining. However, the life of the blast furnace does not depend on the refractory, but on the cooling equipment. The cooling effect of the cooling equipment can reduce the working temperature of the refractory, delay the erosion of the refractory, and after the initial refractory is eroded, it can generate a protective slag skin and form a new permanent lining. This is the key to extending the life of the blast furnace, especially for the high heat load areas of the blast furnace, the furnace waist and the lower part of the furnace body.

[0003] According to the form of cooling equipment, the blast furnace cooling structure can be divided into wall-type and plate-type cooling structures. The cooling equipment of the wall-type cooling structure includes cast iron cooling staves, cast steel cooling staves, and copper cooling staves. The cooling equipment of the plate-type cooling structure is mainly copper cooling plates. For the wall-type cooling structure, its outstanding advantage is full coverage cooling and no cooling blind spots, but cast iron and cast steel cooling staves have the disadvantages of large thermal resistance, low cooling strength, and easy lining shedding. Although the copper cooling stave has high cooling strength, it has the disadvantages of low wall strength, easy deformation, and poor wear resistance. Moreover, the cooling equipment of the wall-type cooling structure cannot be replaced after damage, and must be replaced uniformly after the furnace is stopped and the material line is lowered. The replacement cost is very high. For the plate-type cooling structure, the copper cooling plate is basically arranged in a "pin" shape. Although the cooling strength of a single copper cooling plate is high, it is a "point" type cooling, so there are cooling blind spots, uneven cooling, and it is easy to cause the furnace shell to turn red or even burn through.

[0004] Considering the advantages and disadvantages of wall-type and plate-type cooling, the use of a plate-wall combined cooling structure is the best choice to further extend the life of the blast furnace. The existing plate-wall combined with thin lining structure adopts a layered arrangement of cooling walls and cooling plates. Limited by the minimum size requirements for the manufacture of cooling walls, the longitudinal spacing of the cooling plates is too large, and the cooling plates with strong cooling capacity cannot effectively protect the cooling walls with weak cooling capacity. On the other hand, the maximum transverse thickness of the refractory bricks inlaid on the cooling wall is about 200mm. If the inner end face of the cooling plate inserted into the furnace is required to be flush with the inner end face of the refractory bricks inlaid on the cooling wall, it actually limits the depth of the cooling plate inserted into the furnace, greatly weakening the cooling capacity of the cooling plate. The above two reasons will cause the cooling wall to be damaged prematurely. Since the cooling wall cannot be replaced, its life also determines the life of the blast furnace. Utility Model Content

[0005] The utility model aims to overcome the problems in the prior art that the cooling plate cannot effectively protect the cooling wall and the insertion depth of the cooling plate into the furnace is limited.

[0006] To this end, the utility model provides a plate-wall combined cooling structure, comprising a cooling wall and a plurality of cooling plates; the hot surface of the cooling wall is provided with a refractory lining; the cooling wall is provided with a plurality of reserved holes matching the cooling plates; the refractory lining is provided with a plurality of mounting grooves; the mounting grooves correspond one-to-one to the reserved holes; one end of the cooling plate is inserted into the mounting groove through the reserved hole.

[0007] Specifically, the plurality of cooling plates are staggeredly arranged in the longitudinal direction of the cooling wall.

[0008] Specifically, a water pipe is buried in the cooling wall.

[0009] Specifically, the water pipes are distributed in a serpentine shape around the cooling plate in the longitudinal direction, and the water inlet is below the water outlet.

[0010] Specifically, the water pipes are distributed in a serpentine shape around the cooling plate in the transverse direction.

[0011] Specifically, the cooling plate includes a copper cooling plate; the cooling wall includes a cast iron cooling wall, a cast steel cooling wall or a copper cooling wall; and the refractory lining includes graphite bricks, carbon bricks, and silicon carbide bricks.

[0012] Specifically, the depth of the installation groove is 300-500 mm.

[0013] The utility model also provides a plate-wall combined lining blast furnace, comprising a blast furnace body and the plate-wall combined cooling structure; the side of the cooling wall away from the refractory lining is connected to the inner wall of the furnace shell of the blast furnace body; one end of the cooling plate passes through the furnace shell and the reserved hole in sequence and is inserted into the installation groove of the refractory lining.

[0014] Specifically, the inner wall of the furnace shell of the blast furnace body is connected with a plurality of plate wall combined cooling structures.

[0015] Specifically, the plurality of cooling walls are arranged in staggered layers along the height direction of the furnace shell.

[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0017] The plate wall combined cooling structure provided by the utility model fully utilizes the high cooling strength of the cooling plate. Through the cooperation between the cooling plate and the cooling wall, the cooling blind area is eliminated, the cooling uniformity is improved, and the overall cooling strength is further enhanced, so that the inner lining hot surface can form a stable protective slag skin, and the long-term and reliable operation of the cooling equipment is realized. In addition, the cooling blind area of ​​the cooling plate is eliminated, which can effectively prevent the furnace shell from turning red or even burning through due to the gas leakage in the furnace. The cooling wall has a flexible layout and a simple structure. Due to the low heat load it suffers, the service life of the cooling wall can be effectively extended. The structure has a wide range of applications and can be used in all areas of the blast furnace hearth, tuyere, furnace belly, furnace waist and furnace body, which is beneficial to extend the service life of each area.

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the plate-wall combined cooling structure provided by the utility model.

[0020] Figure 2 It is an external development diagram of the plate-wall combined cooling structure provided by the utility model.

[0021] Figure 3 It is a schematic diagram of water pipe arrangement of the plate-wall combined cooling structure provided by the utility model.

[0022] Figure 4 This is another schematic diagram of water pipe arrangement of the plate-wall combined cooling structure provided by the utility model.

[0023] Explanation of the reference numerals: 1. cooling plate; 2. cooling wall; 201. reserved hole; 3. refractory lining; 4. water pipe; 401. water inlet; 402. water outlet; 5. furnace shell. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0027] Reference Figure 1-2 The utility model provides a plate-wall combined cooling structure, including a cooling wall 2 and a plurality of cooling plates 1; the hot surface of the cooling wall 2 is provided with a refractory lining 3; the cooling wall 2 is provided with a plurality of reserved holes 201 matching the cooling plates 1; the refractory lining 3 is provided with a plurality of mounting grooves; the mounting grooves correspond one-to-one with the reserved holes 201; one end of the cooling plate 1 passes through the reserved holes 201 and is inserted into the mounting groove. When in use, a mounting hole is opened at a position corresponding to the reserved hole 201 on the blast furnace shell 5 and the cooling wall 2, and the non-hot surface side of the cooling wall 2 is connected to the inner wall of the blast furnace shell 5, and the reserved holes 201 correspond one-to-one with the mounting holes. The refractory lining 3 covers the hot surface of the cooling wall 2, and the mounting grooves correspond one-to-one with the reserved holes 201. One end of the cooling plate 1 passes through the mounting hole and the reserved hole 201 in sequence and is inserted into the mounting groove. Through the cooperation between the cooling plate 1 and the cooling wall 2, the regional cooling intensity is enhanced, the inner surface temperature of the refractory lining 3 is reduced, a stable protective slag skin is formed, the erosion rate of the refractory lining 3 is slowed down, and the long-term stable operation of the cooling plate 1 and the cooling wall 2 is achieved. At the same time, the cooling wall 2 can cool the high-temperature gas that penetrates into the inner surface of the furnace shell 5, preventing the furnace shell 5 from reddening or even burning through, and eliminating safety hazards.

[0028] The cooling stave 2, cooling plate 1 and refractory lining 3 are selected according to actual needs. Optionally, the cooling plate 1 includes a copper cooling plate 1; the cooling stave 2 includes a cast iron cooling stave 2, a cast steel cooling stave 2 or a copper cooling stave 2; and the refractory lining 3 is a thermally conductive refractory lining 3, including one of graphite bricks, carbon bricks, and silicon carbide bricks, or a combination of multiple types.

[0029] Specifically, the plurality of cooling plates 1 are staggered in the longitudinal direction of the cooling wall 2, and the spacing between two adjacent layers is equal or unequal, which can simultaneously achieve the purpose of ensuring the expected cooling effect and reducing the amount of cooling plates 1. The cooling plates 1 are preferably evenly spaced and arranged in the transverse direction.

[0030] Preferably, the cooling wall 2 has at least two layers of cooling plates 1 in the longitudinal direction to ensure cooling strength.

[0031] Furthermore, a water pipe 4 is cast into the cooling wall 2 , and heat is transferred through the water pipe 4 to improve the performance of the cooling wall 2 .

[0032] In a detailed implementation, Figure 3 As shown, the water pipe 4 is distributed in a serpentine shape around the cooling plate 1 in the longitudinal direction, and the water inlet 401 is below the water outlet 402, and the cooling water flow direction of the bottom in and the top out can give full play to the water cooling effect. The water pipe 4 is arranged around the cooling plate 1, which can minimize the cooling blind area of ​​the cooling plate 1, thereby improving the cooling effect. At the same time, the cooling plate 1 and the cooling wall 2 can be divided into multiple cooling zones in the horizontal direction to realize the zone control of the cooling intensity, which is very beneficial to the operation of the blast furnace.

[0033] In another embodiment, if Figure 4 As shown, the water pipe 4 is distributed in a serpentine shape around the cooling plate 1 in the horizontal direction, with the water inlet 401 on the left and the water outlet 402 on the right, or the two are interchanged. The cooling direction of the cooling wall 2 is perpendicular to the cooling direction of the cooling plate 1, and the two complement each other and are particularly suitable for preventing the furnace shell 5 from reddening in the circumferential direction.

[0034] Further, the depth of the installation groove is determined according to the thickness of the lining and the required insertion length of the cooling plate 1, preferably 300-500 mm. Optionally, a plurality of installation grooves are arranged in parallel in the horizontal direction, so that the cooling plate 1 is horizontally inserted into the refractory lining 3.

[0035] The utility model also provides a plate-wall combined lining blast furnace, comprising a blast furnace body and the above-mentioned plate-wall combined cooling structure; the side of the cooling wall 2 facing away from the refractory lining 3 is connected to the inner wall of the furnace shell 5 of the blast furnace body; one end of the cooling plate 1 passes through the furnace shell 5 and the reserved hole 201 in sequence and is inserted into the installation groove of the refractory lining 3, and the other end protrudes outside the furnace shell 5.

[0036] According to the size of the part to be cooled, multiple plate wall combined cooling structures can be installed on the blast furnace itself. Multiple cooling walls 2 are evenly distributed along the circumference of the furnace shell 5 in the transverse direction.

[0037] The plurality of cooling walls 2 are evenly distributed along the circumference of the furnace shell 5 in the transverse direction and are arranged in staggered layers in the vertical direction along the height of the furnace shell 5. Figure 2 As shown, the connecting seams of two adjacent layers of cooling walls 2 in the longitudinal direction are staggered.

[0038] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are identical or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A plate-wall combined cooling structure, characterized in that: It comprises a cooling wall (2) and a plurality of cooling plates (1); the hot surface of the cooling wall (2) is provided with a refractory lining (3); the cooling wall (2) is provided with a plurality of reserved holes (201) matching the cooling plates (1); the refractory lining (3) is provided with a plurality of mounting grooves; the mounting grooves correspond one to one with the reserved holes (201); one end of the cooling plate (1) passes through the reserved holes (201) and is inserted into the mounting groove.

2. The plate-wall combined cooling structure as claimed in claim 1, characterized in that: The plurality of cooling plates (1) are arranged alternately in the longitudinal direction of the cooling wall (2).

3. The plate-wall combined cooling structure as claimed in claim 1, characterized in that: A water pipe (4) is buried in the cooling wall (2).

4. The plate-wall combined cooling structure as claimed in claim 3, characterized in that: The water pipe (4) is distributed in a serpentine shape around the cooling plate (1) in the longitudinal direction, and the water inlet (401) is below the water outlet (402).

5. The plate-wall combined cooling structure as claimed in claim 3, characterized in that: The water pipes (4) are distributed in a serpentine shape around the cooling plate (1) in the transverse direction.

6. The plate-wall combined cooling structure as claimed in claim 1, characterized in that: The cooling plate (1) comprises a copper cooling plate (1); the cooling wall (2) comprises a cast iron cooling wall (2), a cast steel cooling wall (2) or a copper cooling wall (2); and the refractory lining (3) comprises graphite bricks, carbon bricks or silicon carbide bricks.

7. The plate-wall combined cooling structure as claimed in claim 1, characterized in that: The depth of the installation groove is 300-500 mm.

8. A plate wall combined lining blast furnace, characterized in that: It comprises a blast furnace body and a plate-wall combined cooling structure as described in any one of claims 1 to 7; the side of the cooling wall (2) facing away from the refractory lining (3) is connected to the inner wall of the furnace shell (5) of the blast furnace body; one end of the cooling plate (1) passes through the furnace shell (5) and the reserved hole (201) in sequence and is then inserted into the installation groove of the refractory lining (3).

9. The plate wall combined lining blast furnace as claimed in claim 8, characterized in that: The inner wall of the furnace shell (5) of the blast furnace body is connected with a plurality of plate wall combined cooling structures.

10. The plate wall combined lining blast furnace as claimed in claim 9, characterized in that: The plurality of cooling walls (2) are arranged in staggered layers along the height direction of the furnace shell (5).

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