Welding repair structure for cracking of furnace shell of hot-blast stove

Abstract

The utility model discloses a hot-blast stove shell cracking welding repair structure which comprises a hot-blast stove shell with a cracking position, the cracking position of the hot-blast stove shell is welded to form a cracking repair welding seam, and a plurality of reinforcing steel plates are evenly and vertically welded on the hot-blast stove shell along the cracking repair welding seam at intervals. And two-side fillet welds for connecting the hot-blast stove shell with the reinforcing steel plates are formed on two sides of each reinforcing steel plate. The welding repair structure for cracking of the furnace shell of the hot blast stove is simple in structure, easy to implement, low in cost, good in effect and capable of effectively solving the problem that welding repair strength is not enough after the furnace shell of the hot blast stove is cracked.

Description

Technical Field

[0001] This utility model belongs to the field of plate hook repair technology, specifically relating to a welding repair structure for cracked hot blast stove shell. Background Technology

[0002] The working principle of a hot blast stove is to transfer the heat energy generated by fuel combustion to the heated air, thereby producing high-temperature hot blast for the heating or drying process in blast furnace ironmaking. The main components of the hot blast stove are the inner refractory layer, the furnace shell, and the outer insulation layer. Due to the long-term generation of high-temperature hot blast inside the furnace, localized refractory layer detachment and cracking occur. The high-temperature flame directly affects the furnace shell, often leading to localized cracking. Although cracks can be repaired by welding in time, and the inner refractory layer material can be compensated by drilling above and below the repaired crack to prevent re-melting and cracking of the furnace shell due to the lack of refractory layer in those areas during reuse, the mechanical strength of the repaired partially cracked shell is insufficient due to the damage. If the welded area is not reinforced, prolonged use at high temperatures may directly cause localized re-fracture, affecting the overall operation of the hot blast stove. Therefore, it is necessary to design a welding repair structure for hot blast stove shell cracks, along with corresponding methods, to solve the problem of insufficient welding repair strength for hot blast stove shell cracks. Utility Model Content

[0003] To address the problems existing in the above-mentioned background technology, this utility model provides a welding repair structure for cracked hot blast stove shells, which is simple in structure, easy to implement, low in cost, and effective.

[0004] The technical solution of this utility model to solve the technical problem is as follows:

[0005] According to one aspect of the present invention, a welded repair structure for cracked hot blast stove shell is provided, comprising a hot blast stove shell with cracks, wherein a crack repair weld is formed at the cracks in the hot blast stove shell, and a plurality of reinforcing steel plates are uniformly spaced and vertically welded on the hot blast stove shell along the crack repair weld, and fillet welds are formed on both sides of each reinforcing steel plate to connect the hot blast stove shell and the reinforcing steel plate.

[0006] As a further improvement to the technical solution, the reinforcing steel plate is made by cutting a 50mm thick steel plate.

[0007] As a further improvement to the technical solution, the weld leg size of the two side fillet welds is greater than 2 / 3 of the size of the reinforcing steel plate.

[0008] As a further improvement to the technical solution, the spacing between adjacent reinforcing steel plates shall not exceed 200mm.

[0009] As a further improvement to the technical solution, the length of each of the reinforcing steel plates is not less than 300mm.

[0010] Compared with the prior art, the welding repair structure for cracked hot blast stove shell described in this utility model is simple in structure, easy to implement, low in maintenance cost, and has good welding repair effect. By welding and fixing the reinforcing steel plates evenly distributed at the crack repair weld to the furnace shell, the strength of the weld repair of cracked hot blast stove shell can be effectively ensured. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0012] In the diagram: 1. Hot blast stove shell; 2. Crack repair weld; 3. Reinforcing steel plate; 4. Fillet welds on both sides. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this disclosure pertains. The terms "upper," "lower," "left," "right," "front," and "back" used in the present patent application specification and claims are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly. Words such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Any aspects not detailed in the present utility model are well-known technologies to those skilled in the art.

[0014] As attached Figure 1As shown, this utility model provides a welded repair structure for cracked hot blast stove shells, including a hot blast stove shell 1 with cracks. A crack repair weld 2 is formed at the crack in the hot blast stove shell 1 through welding. During welding, welding materials of equal strength are matched, and shielded metal arc welding (SMAW) is selected. Single-sided welding with double-sided forming technology is used to complete the welding of the bottom layer, filler layer, and top layer. After room temperature testing, no welding defects are found, completing the crack repair weld 2. Then, multiple reinforcing steel plates 3 are evenly spaced and vertically welded onto the hot blast stove shell 1 along the crack repair weld 2. Fillet welds 4 are formed on both sides of each reinforcing steel plate 3, connecting the hot blast stove shell 1 to the reinforcing steel plate 3. Specifically, Q355 steel plates are selected to make the reinforcing steel plates 3, and the weld fillet size is designed. Carbon dioxide gas protection is selected, and the welding material is matched to Q355 material (ER50-6 welding wire). Preheating to approximately 100 degrees Celsius is performed before welding the bottom layer, filler layer, and top layer. After welding is completed, the weld is covered with insulation cotton and cooled to room temperature. It is then inspected by a PT (Polymer Transformer) to confirm that there are no welding defects before it is put into use.

[0015] In a preferred embodiment, the reinforcing steel plate 3 is cut from a 50mm thick steel plate. The weld angle of the two side fillet welds 4 is greater than 2 / 3 of the reinforcing steel plate 3. The distance between adjacent reinforcing steel plates 3 does not exceed 200mm. The length of each reinforcing steel plate 3 is not less than 300mm. By optimizing the size of the reinforcing steel plate 3 and the welding parameters, the strength of the hot blast stove shell 1 after welding repair can be further enhanced, and the cracked repair weld 2 can be prevented from cracking again.

Claims

1. A welded repair structure for cracked hot blast stove shell, comprising a hot blast stove shell (1) with cracks present, characterized in that, The cracked area of ​​the hot blast stove shell (1) is repaired by welding to form a crack repair weld (2). Multiple reinforcing steel plates (3) are uniformly spaced and vertically welded on the hot blast stove shell (1) along the crack repair weld (2). Fillet welds (4) connecting the hot blast stove shell (1) and the reinforcing steel plate (3) are formed on both sides of each reinforcing steel plate (3).

2. The welded repair structure for cracked hot blast stove shell according to claim 1, characterized in that, The reinforcing steel plate (3) is made by cutting a 50mm thick steel plate.

3. A welded repair structure for cracked hot blast stove shell according to claim 1 or 2, characterized in that, The weld leg size of the two side fillet welds (4) is greater than 2 / 3 of that of the reinforcing steel plate (3).

4. The welded repair structure for cracked hot blast stove shell according to claim 3, characterized in that, The spacing between adjacent reinforcing steel plates (3) shall not exceed 200 mm.

5. The welded repair structure for cracked hot blast stove shell according to claim 3, characterized in that, The length of each of the reinforcing steel plates (3) is not less than 300 mm.

Images