Sealing structure of blast furnace iron notch and method for preventing blast furnace iron notch from leaking gas

Abstract

The invention discloses a sealing structure of a blast furnace taphole and a method for preventing the blast furnace taphole from leaking gas, and belongs to the technical field of blast furnace ironmaking equipment. And the reinforced castable layer in the taphole frame plate is a common castable layer containing stainless steel wire fibers. And a circle of pretreated carbon ramming material gap filling area and a carbon ramming material layer are arranged at the edges of the iron notch frame plate and the carbon brick layer in the cooling wall. The invention further provides a method for preventing the blast furnace taphole from leaking gas, the integrity is high, no leakage channel exists, traditional bricklaying is replaced with integral pouring, a large number of brick joints are fundamentally eliminated, and potential gas leakage points are remarkably reduced. The material is excellent in performance and remarkable in safety benefit due to multiple sealing and blocking.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of blast furnace ironmaking equipment, and particularly relates to a sealing structure of a blast furnace iron notch and a method for preventing blast furnace iron notch gas leakage. BACKGROUND

[0002] The blast furnace is a core equipment for steel smelting, and the iron notch is a key passage for discharging molten iron and slag. The iron notch area has a complex structure and a poor working environment, and is subjected to high temperature, high pressure and molten material erosion for a long time. At present, after many newly-built blast furnaces are put into operation, the phenomenon of gas leakage between the iron notch frame and the surrounding cooling wall and the furnace shell often occurs. The leaked blast furnace gas not only contains high concentration of carbon monoxide, causing serious safety hazards and threatening the safety of the operators in front of the furnace, but also erodes the equipment structure and shortens the service life of the equipment. In severe cases, it may even cause fire or explosion, directly affecting the normal and stable production of the blast furnace.

[0003] Traditionally, the gap between the iron notch frame and the furnace shell is filled with refractory bricks. This structure has a large number of brick joints, which are prone to expansion and loosening under the action of high temperature thermal stress and mechanical vibration, forming a channel for gas leakage. Although there are also schemes for filling with castable in the prior art, the ordinary castable structure still has deficiencies in crack resistance, integrity and bonding strength with metal components, and cannot completely solve the problem of gas leakage along the interface between the iron notch frame steel plate and the castable, as well as the internal cracks of the castable.

[0004] Therefore, there is an urgent need for an innovative structure and a leakage prevention method that can fundamentally improve the sealing performance of the iron notch frame area and effectively block gas leakage. SUMMARY

[0005] One object of the present application is to overcome the deficiencies of the prior art, and provide a sealing structure of a blast furnace iron notch. Another object of the present application is to provide a method for preventing blast furnace iron notch gas leakage using the sealing structure, an innovative structure and a leakage prevention method that can improve the sealing performance of the iron notch frame area and effectively block gas leakage.

[0006] The technical scheme adopted by the present application is as follows: A sealing structure of a blast furnace iron notch, comprising an iron notch frame plate, a plurality of V-shaped anchor members, a gas blocking plate, a reinforced castable layer and a carbon ramming material layer.

[0007] The technical points of the present application are as follows: The iron notch frame plate is fixed with a plurality of V-shaped anchor members and a ring of gas blocking plates.

[0008] The iron notch frame plate has a reinforced castable layer inside, which is a common castable layer containing stainless steel wire fibers. The reinforced castable layer is provided with an iron notch hole.

[0009] The multiple V-shaped anchoring members and the gas barrier plate are located in the reinforced castable layer.

[0010] The edge between the taphole frame and the carbon brick layer in the stave is provided with a pre-processed carbon ramming gap filling area and a carbon ramming layer.

[0011] The V-shaped anchoring members can include multiple V-shaped anchoring members which are fixed in the inner circle of the taphole frame.

[0012] The method for preventing the leakage of gas from the taphole of a blast furnace by using the sealing structure of the taphole of the blast furnace, characterized in that it comprises the following steps: The multiple V-shaped anchoring members and the gas barrier plate are fixed in the taphole frame.

[0013] The gap between the edge of the taphole frame and the carbon brick layer is opened to a pre-processed carbon ramming gap filling area and filled with carbon ramming to form a carbon ramming layer.

[0014] The reinforcing castable is poured into the cavity of the taphole frame to form an integrated reinforcing castable layer and leave a taphole hole by adding 3-4% of stainless steel wire fibers and an appropriate amount of water to the ordinary refractory castable and stirring uniformly.

[0015] The depth of the pre-processed carbon ramming gap filling area can be not less than 50 mm.

[0016] The mass of the stainless steel wire fibers in the reinforcing castable is less than 5% of the mass of the reinforcing castable.

[0017] The advantages are: Strong integrity, no leakage channel: The traditional bricklaying is replaced by integral pouring, which fundamentally eliminates a large number of brick joints and significantly reduces potential gas leakage points.

[0018] Superior material performance: The toughness and strength of the reinforcing castable with added stainless steel wire fibers are greatly improved, and the anti-cracking ability is enhanced, ensuring the long-term integrity of the sealing body.

[0019] Multiple sealing barriers: The combination of the reinforcing castable and the metal body is improved by welding V-shaped anchoring members; the main gas channeling channel is directly cut off by setting a middle gas barrier plate; the seamless engagement of the castable and the surrounding materials is achieved by pre-processing the edge gap, forming multiple reliable sealing lines.

[0020] Significant safety benefits: This method can effectively prevent the leakage of gas from the taphole frame, greatly improve the safety of the blast furnace front operation, and ensure the long-term smooth operation and stable production of the blast furnace.

[0021] The method improves the overall sealing performance and structural strength of the iron notch frame area by systematic structural improvement and material optimization, thereby effectively preventing gas leakage. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of the iron notch frame area structure of the blast furnace after the implementation of the present application.

[0023] Figure 2 is a side view of the iron notch frame plate and the V-shaped anchor.

[0024] In the figure: iron notch frame plate 1, V-shaped anchor 2, gas barrier plate 3, reinforced castable layer 4 (containing stainless steel wire fiber), furnace shell 5, pre-processed carbon ramming gap filling area 6, cooling wall 7, furnace shell 5, iron notch hole 8, carbon ramming layer 9, carbon brick layer 10. DETAILED DESCRIPTION

[0025] A sealing structure of a blast furnace iron notch includes an iron notch frame plate 1 (steel plate), multiple circles of V-shaped anchors, a gas barrier plate 3, a reinforced castable layer 4, and a carbon ramming layer 9.

[0026] The iron notch frame plate 1 is a rectangular frame.

[0027] The multiple circles of V-shaped anchors are fixed in the iron notch frame plate 1.

[0028] Each circle of V-shaped anchors includes multiple V-shaped anchors 2 (steel), which are fixed in the inner circle of the iron notch frame plate 1 by interval welding.

[0029] The gas barrier plate 3 is fixed in the iron notch frame plate 1 and located between the multiple circles of V-shaped anchors.

[0030] The iron notch frame plate 1 has a reinforced castable layer 4, which is a conventional ordinary castable layer containing stainless steel wire fiber.

[0031] The mass of the stainless steel wire fiber accounts for 3%-4% of the mass of the ordinary castable.

[0032] The reinforced castable layer 4 is provided with an iron notch hole 8.

[0033] The multiple circles of V-shaped anchors and the gas barrier plate 3 are located in the reinforced castable layer 4.

[0034] The furnace shell 5 has a cooling wall 7, and the iron notch frame plate 1 is fixed at the outlet of the furnace shell 5 and the cooling wall 7.

[0035] The cooling wall 7 has a carbon brick layer 10, and the iron notch frame plate 1 is provided with a pre-processed carbon ramming gap filling area 6 around the edge of the carbon brick layer 10, and the pre-processed carbon ramming gap filling area 6 is provided with a carbon ramming layer 9.

[0036] A method for preventing gas leakage from the blast furnace taphole using the aforementioned sealing structure includes the following steps: 1. Structural pretreatment: Clean the surface of the iron frame plate 1 to ensure it is free of oil and rust. Then, evenly weld multiple rings of V-shaped anchors 2 onto the inner surface of the iron frame steel 1. The material of the V-shaped anchors 2 is preferably the same as or similar to that of the steel plate, and the welding should be firm to enhance the mechanical anchoring force and bonding strength between the subsequent castable and the iron frame plate 1.

[0037] 2. Next, at the middle position of the height of the iron tap frame plate 1, a ring steel plate with a width of 30mm is welded around the inner circumference of the iron tap frame plate 1 as a gas barrier plate 3. The welding method is full welding to ensure that the weld is continuous and without defects. The gas barrier plate 3 is used to physically block the path of gas flowing longitudinally along the surface of the iron tap frame steel plate.

[0038] Next, a groove with a depth of 50mm to 60mm is manually cut out between the edge of the iron frame plate 1 and the original carbon brick layer 10 as a pre-treated carbon ramming material gap filling area 6. For example, it can be 50mm, 55mm or 60mm, so that the subsequent carbon ramming material (existing material) can fully flow in and fill and form a carbon ramming material layer 9, eliminating the weak link at this point.

[0039] 3. After preparation, prepare the ordinary refractory castable (dry mix). During the mixing process, add 3%-4% (by weight of the ordinary refractory castable) of heat-resistant stainless steel wire fibers to the ordinary refractory castable. After mixing evenly, add an appropriate amount of water (about 6% by weight of the ordinary refractory castable) and mix evenly to obtain the reinforced castable. This improves the flexural strength and compressive strength of the castable after molding and inhibits cracking during baking and use.

[0040] 4. Finally, integral casting construction: Using a formwork casting method, the reinforcing castable is poured into the cavity of the iron taphole frame plate 1. During casting, a vibrator must be used to fully compact the material, ensuring that the castable fills all spaces densely, especially between the V-shaped anchors 2, around the gas barrier plate 3, and in the pre-treated carbon mortar gap filling area 6, forming an integral reinforcing castable layer 4 cavity, leaving the iron taphole hole 8. After casting, it is cured and baked according to regulations to form a strong, seamless, dense seal that can effectively prevent gas leakage for a long time.

Claims

1. A sealing structure for a blast furnace taphole, comprising a taphole frame plate (1), multiple V-shaped anchors, a gas barrier plate (3), a reinforcing castable layer (4), and a carbon mortar layer (9), characterized in that: The iron frame plate (1) is fixed with multiple V-shaped anchors and a gas barrier plate (3). The iron-mouth frame plate (1) has a reinforcing castable layer (4) inside. The reinforcing castable layer (4) is a common castable layer containing stainless steel wire fibers. The reinforcing castable layer (4) is provided with an iron-mouth hole (8). The multi-ring V-shaped anchor and the gas barrier plate (3) are both located within the reinforced castable layer (4); A pre-treated carbon mortar gap filling area (6) is opened at the edge of the carbon brick layer (10) in the iron frame plate (1) and the cooling wall (7), and a carbon mortar layer (9) is provided.

2. The sealing structure for a blast furnace taphole according to claim 1, characterized in that: Each ring of V-shaped anchors includes multiple V-shaped anchors (2), which are fixed at intervals to the inner ring of the iron frame plate (1).

3. The sealing structure of a blast furnace taphole according to claim 1, characterized in that: The gas barrier plate (3) is located between multiple V-shaped anchors.

4. The sealing structure of a blast furnace taphole according to claim 1, characterized in that: The stainless steel wire fiber accounts for 3%-4% of the mass of ordinary castable.

5. A method for preventing gas leakage from blast furnace tapholes using a sealing structure, characterized in that... Includes the following steps: The iron frame plate (1) is fixed with multiple V-shaped anchors and a gas barrier plate (3); Make a pre-treated carbon ramming material gap filling area (6) around the gap between the edge of the iron frame plate (1) and the carbon brick layer (10) and fill it with carbon ramming material to form a carbon ramming material layer (9). Add 3%-4% stainless steel wire fiber and an appropriate amount of water to the ordinary refractory castable. After mixing evenly, use the formwork casting method to pour the reinforcing castable into the cavity of the iron taphole frame plate (1) to form an integral reinforcing castable layer (4) and leave the iron taphole (8).

6. The method for preventing gas leakage from the blast furnace taphole using a sealing structure according to claim 5, characterized in that... Includes the following steps: The width of the gas barrier plate (3) is 30mm; The depth of the pretreated carbon mortar gap filling area (6) is 50 mm to 60 mm.

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