Furnace bottom plate mounting and welding construction method for large-scale iron-making blast furnace hot blast stove

Abstract

The invention relates to a construction method for installing and welding a furnace bottom plate of a large iron-making blast furnace hot blast stove, which comprises the following steps of: arranging a temporary pressing beam above a welding section of the furnace bottom plate in the welding process of the furnace bottom plate of the hot blast stove, and welding the furnace bottom plate outwards from the center of the furnace bottom plate; the method has the beneficial effects that deformation of the furnace bottom plate in the welding process is prevented through the temporary pressing beam, the welding effect is good, the levelness of the furnace bottom plate is high, the quality and safety of construction operation are guaranteed, welding stress is gradually discharged, welding stress deformation is reduced, and the welding quality is improved. And deformation of the welded furnace bottom plate is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace hot blast furnace bottom plate welding, and in particular to a large-scale iron-making blast furnace hot blast furnace bottom plate installation welding construction method. Background Art

[0002] Hot blast furnace, as the hot blast source in blast furnace ironmaking system, plays an extremely important role. The welding quality of the hot blast furnace bottom plate directly affects the service life of the hot blast furnace.

[0003] In the previous hot blast furnace bottom plate welding construction, in order to prevent the bottom plate welding deformation, the reverse deformation method and the control of welding process parameters were often used to control the deformation of the bottom plate after welding. The welding effect was not good, the horizontality of the bottom plate after welding was easy to exceed the tolerance, and the long construction period was often not conducive to the subsequent processes. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a method for installing and welding a furnace bottom plate of a hot blast furnace in a large iron-making blast furnace. During the welding process of the furnace bottom plate of the hot blast furnace, a temporary pressure beam is arranged above the welding section of the furnace bottom plate. The temporary pressure beam prevents the furnace bottom plate from deforming during the welding process. The welding effect is good, the furnace bottom plate has a high levelness, and the quality and safety of the construction operation are guaranteed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for installing and welding a furnace bottom plate of a large-scale blast furnace hot blast furnace, the method comprising the following steps:

[0007] (1) Install the hot air furnace bottom plate

[0008] The bottom plate of the hot blast stove is composed of several plates;

[0009] (2) Determine the location of the temporary pressure beam

[0010] Determine the position of the temporary pressure beam, and according to the structure of the temporary pressure beam, first weld the welds at the position where the hot blast furnace bottom plate is blocked by the temporary pressure beam;

[0011] (3) Setting up temporary pressure beam

[0012] Install the temporary pressure beam on the upper surface of the furnace floor, and the length of the temporary pressure beam shall not exceed the inner wall of the basin section at the end of the furnace floor;

[0013] (4) Welding furnace bottom plate

[0014] The welding sequence is determined according to the combined structure between the plates of the furnace bottom plate. The welding sequence is to weld from the center of the furnace bottom plate to the outside, first weld the short weld and then the long weld, first weld the straight weld and then the circumferential weld;

[0015] (5) Removal of temporary pressure beams

[0016] After welding is completed, remove the temporary pressure beam.

[0017] Furthermore, the temporary pressure beams include transverse beams and longitudinal beams, which are staggered and evenly arranged on the upper surface of the bottom plate of the hot blast furnace.

[0018] Furthermore, the spacing between the beams is no more than 1600 mm.

[0019] Furthermore, the spacing between the longitudinal beams is not greater than 1600 mm.

[0020] Furthermore, in the step (3), the temporary pressure beam is fixed to the furnace bottom plate by intermittent welding.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. During the welding process of the hot blast furnace bottom plate, a temporary pressure beam is set above the welding section of the furnace bottom plate to prevent the furnace bottom plate from deforming during the welding process, thereby ensuring the welding quality, good welding effect, high levelness of the furnace bottom plate, and ensuring the quality and safety of the construction operation.

[0023] 2. The welding sequence of the furnace bottom plate is from the center of the furnace bottom plate to the outside. Short welds are welded first and then long welds, straight welds are welded first and then circumferential welds, so as to gradually discharge welding stress, reduce welding stress deformation, and reduce deformation of the furnace bottom plate after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the arrangement of the furnace bottom plate pressure beams described in the present invention.

[0025] Figure 2 It is a schematic diagram of the furnace bottom plate welding sequence described in the present invention.

[0026] In the figure: 1, 1# weld; 2, 2# weld; 3, 3# weld; 4, 4# weld; 5, temporary pressure beam; 6, cross beam; 7, longitudinal beam. DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention are further described below:

[0028] like Figure 1-Figure 2 As shown, a method for installing and welding a furnace bottom plate of a large-scale hot blast furnace for ironmaking is provided, wherein the method for installing and welding comprises the following steps:

[0029] (1) Install the hot air furnace bottom plate

[0030] The hot blast furnace bottom plate is composed of several plates, which are connected by welding to form the hot blast furnace bottom plate;

[0031] (2) Determine the location of the temporary pressure beam

[0032] Determine the position of the temporary pressure beam 5, and according to the structure of the temporary pressure beam 5, first weld the weld of the position of the hot blast furnace bottom plate blocked by the temporary pressure beam 5;

[0033] (3) Setting up temporary pressure beam

[0034] The temporary pressure beam 5 is installed on the upper surface of the furnace bottom plate, and the length of the temporary pressure beam 5 does not exceed the inner wall of the basin section at the end of the furnace bottom plate;

[0035] (4) Welding furnace bottom plate

[0036] The welding sequence is determined according to the combined structure between the plates of the furnace bottom plate. The welding sequence is to weld from the center of the furnace bottom plate to the outside, first weld the short weld and then the long weld, first weld the straight weld and then the circumferential weld. The welding sequence is as follows: Figure 2 As shown, the welding sequence of 1# weld 1-2# weld 2-3# weld 3-4# weld 4, the arrow direction in the figure is the welding direction, the purpose is to gradually discharge the welding stress, the welding deformation gradually extends outward, and the temporary pressure beam is used to correct the welding stress and welding deformation, thereby reducing the welding stress and deformation;

[0037] (5) Removal of temporary pressure beams

[0038] After welding is completed, the temporary pressure beam 5 is removed.

[0039] Furthermore, the temporary pressure beam 5 includes a cross beam 6 and a longitudinal beam 7, and the cross beam 6 and the longitudinal beam 7 are staggered and evenly arranged on the cross section of the bottom plate of the hot blast furnace.

[0040] Furthermore, the spacing between the cross beams 6 is no more than 1600 mm.

[0041] Furthermore, the spacing between the longitudinal beams 7 is not greater than 1600 mm.

[0042] Furthermore, the temporary pressure beam 5 is fixed to the furnace bottom plate by intermittent welding.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0044] The following examples are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operating processes, but the protection scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0045] [Example]

[0046] like Figure 1-Figure 2 As shown, the diameter of the hot blast furnace bottom plate is about 9000mm, the plate thickness is 20-30mm, and there are 21 plates in total.

[0047] like Figure 1 As shown, a temporary pressure beam 5 is arranged on the furnace bottom plate: in order to prevent the furnace bottom plate from wave-like deformation due to welding, a 140 I-beam is arranged on the entire furnace bottom plate before welding to form a temporary pressure beam 5 for reinforcement.

[0048] Before installing the temporary pressure beam 5, the weld of the temporary pressure beam 5 covering the furnace bottom plate weld is first welded, and the welding length L=160 mm.

[0049] like Figure 1 As shown, the temporary pressure beam 5 is installed. The temporary pressure beam 5 is composed of a cross beam 6 and a longitudinal beam 7. The distance between the cross beam 6 and the longitudinal beam 7 is 1600mm. The temporary pressure beam 5 and the furnace bottom plate are fixed by intermittent welding. The weld length L=100mm and the weld interval L=100mm.

[0050] like Figure 2 The numbers shown are the welding sequence, and the direction indicated by the arrow is the welding direction of the weld. The welding sequence is from the center of the furnace bottom plate to the outside, first welding the short welds and then the long welds, first welding the straight welds and then the circumferential welds, that is, first welding 1# weld 1, then welding 2# weld 2, then welding 3# weld 3, and finally welding 4# circumferential weld 4.

[0051] The furnace bottom plate welding is completed, the temporary pressure beam 5 is removed, the furnace bottom plate welding effect is good, and the furnace bottom plate is highly level.

Claims

1. A method for installing and welding the bottom plate of a hot blast furnace in a large iron-making blast furnace, characterized in that: The construction method of installation welding comprises the following steps: (1) Install the hot air furnace bottom plate The bottom plate of the hot blast stove is composed of several plates; (2) Determine the location of the temporary pressure beam Determine the position of the temporary pressure beam, and according to the structure of the temporary pressure beam, first weld the welds at the position where the hot blast furnace bottom plate is blocked by the temporary pressure beam; (3) Setting up temporary pressure beam Install the temporary pressure beam on the upper surface of the furnace floor, and the length of the temporary pressure beam shall not exceed the inner wall of the basin section at the end of the furnace floor; (4) Welding furnace bottom plate The welding sequence is determined according to the combined structure between the plates of the furnace bottom plate. The welding sequence is to weld from the center of the furnace bottom plate to the outside, first weld the short weld and then the long weld, first weld the straight weld and then the circumferential weld; (5) Removal of temporary pressure beams After welding is completed, remove the temporary pressure beam.

2. A method for installing and welding a furnace bottom plate of a large-scale hot blast furnace for ironmaking according to claim 1, characterized in that: The temporary pressure beam comprises a transverse beam and a longitudinal beam, and the transverse beam and the longitudinal beam are staggered and evenly arranged on the cross section of the bottom plate of the hot blast furnace.

3. A method for installing and welding a furnace bottom plate of a large-scale hot blast furnace for ironmaking according to claim 2, characterized in that: The spacing between the beams is no more than 1600 mm.

4. The method for installing and welding the bottom plate of a hot blast furnace for a large ironmaking blast furnace according to claim 2, characterized in that: The spacing between the longitudinal beams is no more than 1600 mm.

5. The method for installing and welding the bottom plate of a hot blast furnace for a large ironmaking blast furnace according to claim 1, characterized in that: The temporary pressure beam is fixed to the furnace bottom plate by intermittent welding.

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