CN217398903U

CN217398903U - Blast furnace bottom structure

Info

Publication number: CN217398903U
Application number: CN202220175986.6U
Authority: CN
Inventors: 赵鸿波; 刘岩; 乔军; 赵建成
Original assignee: Bengang Steel Plates Co Ltd
Current assignee: Bengang Steel Plates Co Ltd
Priority date: 2022-01-21
Filing date: 2022-01-21
Publication date: 2022-09-09
Anticipated expiration: 2032-01-21

Abstract

The utility model relates to a blast furnace bottom structure, wherein the furnace bottom of a blast furnace is an arc furnace bottom; the shape of the inner contour line of the corresponding central section of the arc-shaped furnace bottom is a semiellipse, the length of a short semi-axis of the semiellipse is the height of an arc-shaped surface of the arc-shaped furnace bottom, and two ends of the semiellipse are tangent to the furnace wall on the corresponding side. Blast furnace bottom construction adopts the semiellipse circular furnace bottom construction of carbon brick and the compound formation of refractory castable, discharges slag iron and slag iron liquid at the blast furnace and forms and collect the in-process, can reduce the stove bottom circulation, increase coke dead charge heap bottom liquidity and be favorable to the space to form to reduce the molten iron circulation and to the intensity of erodeing of blast furnace lateral wall, prolong the life of blast furnace crucible.

Description

Blast furnace bottom structure

Technical Field

The utility model relates to a blast furnace technical field especially relates to a blast furnace bottom structure.

Background

At present, blast furnaces at home and abroad usually adopt a horizontal furnace bottom structure, and the furnace bottom of the blast furnace is easy to damage due to the influence of domestic raw material conditions, operation systems and the like; particularly, the service life of the blast furnace is seriously shortened due to the development of large-scale blast furnaces and the improvement of metallurgical properties of raw materials, namely, the strengthening smelting level of the blast furnace is higher and higher in recent years. The original blast furnace design has not been able to meet the long life requirements of blast furnaces. The problem of short service life of the blast furnace is mainly concentrated in a molten iron circulation area, namely molten iron circulation is always transmitted to the edge, particularly when the liquid permeability of coke is abnormal, the molten iron circulation is concentrated at the edge of the blast furnace, scouring damage is directly acted on the side wall of a furnace body, and the refractory material at the bottom of the furnace hearth is corroded.

In order to reduce the influence of the molten iron circulating area, a representative method is adopted to thicken key erosion parts by additionally arranging a boss, but practice proves that the method cannot effectively prolong the service life of the area.

Disclosure of Invention

The utility model provides a blast furnace bottom structure adopts the semiellipse circular furnace bottom structure of the compound formation of carbon brick and refractory castable, discharges slag iron and slag iron liquid at the blast furnace and forms and collect the in-process, can reduce the stove bottom circulation, increase coke dead charge heap bottom liquidity and be favorable to the space to form to reduce the washing away intensity of molten iron circulation to the blast furnace lateral wall, prolong the life of blast furnace crucible.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a blast furnace bottom structure is characterized in that the bottom of a blast furnace is an arc bottom; the shape of the inner contour line of the corresponding central section of the arc-shaped furnace bottom is a semiellipse, the length of a short semi-axis of the semiellipse is the height of an arc-shaped surface of the arc-shaped furnace bottom, and two ends of the semiellipse are tangent to the furnace wall of the corresponding side.

The furnace bottom of the blast furnace consists of a refractory castable layer, a carbon brick transition layer and a carbon brick base layer from top to bottom in sequence; the refractory castable layer is of a half-shell structure matched with the shape of the arc furnace bottom, and the thicknesses of all parts are equal; the carbon brick base layer consists of a plurality of layers of carbon bricks which are tiled; the bottom surface of the carbon brick transition layer is a plane, and the top surface is a semi-elliptical surface matched with the arc furnace bottom.

The thickness of the refractory castable layer is 350-500 mm measured along the center line of the blast furnace.

The thickness of the carbon brick transition layer is 200-400 mm measured along the center line of the blast furnace.

The thickness of the carbon brick base layer is not less than 1200mm measured along the center line of the blast furnace.

The carbon brick transition layer is provided with 1 layer of carbon bricks at the position corresponding to the center of the blast furnace, and 2-3 layers of carbon bricks are arranged at the position close to the furnace wall.

The height of the arc surface of the arc furnace bottom is 300-500 mm.

Compared with the prior art, the beneficial effects of the utility model are that:

1) the semi-elliptical furnace bottom structure formed by compounding the carbon bricks and the refractory castable is adopted, so that in the process of forming and collecting iron slag discharged by the blast furnace and iron slag liquid, the circulating flow of the furnace bottom can be reduced, the liquid permeability of the bottom of a coke dead material pile can be increased, and the formation of gaps is facilitated, so that the scouring strength of the molten iron circulating flow on the side wall of the blast furnace is reduced, and the service life of a blast furnace hearth is prolonged;

2) the thickness of the refractory castable layer is uniform and consistent as a whole, and the refractory castable is heated uniformly, so that the annular stress damage caused by different thermal gradients can be prevented;

3) the structure is simple, the construction is convenient, the original design system of the blast furnace is not influenced, and the structure adjustment of the furnace shell, the cooling wall and the furnace bottom cooling equipment is not needed.

Drawings

FIG. 1 is a schematic view of a blast furnace bottom structure according to the present invention.

In the figure: 1. furnace wall 2, furnace bottom 21, refractory material layer 22, carbon brick transition layer 23 and carbon brick base layer

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:

as shown in figure 1, the furnace bottom 2 of the blast furnace is an arc furnace bottom; the shape of the inner contour line of the corresponding central section of the arc-shaped furnace bottom is a semiellipse, the length of the short semi-axis of the semiellipse is the height of the arc-shaped surface of the arc-shaped furnace bottom, and the two ends of the semiellipse are tangent to the furnace wall 1 on the corresponding side.

The furnace bottom of the blast furnace consists of a refractory castable layer 21, a carbon brick transition layer 22 and a carbon brick base layer 23 from top to bottom in sequence; the refractory castable layer 21 is a half-shell structure which is adaptive to the shape of the arc furnace bottom, and the thickness of each part is equal; the carbon brick base layer 23 is composed of a plurality of layers of carbon bricks which are tiled; the bottom surface of the carbon brick transition layer 22 is a plane, and the top surface is a semi-elliptical surface matched with the arc furnace bottom.

The thickness of the refractory castable layer (H3 in FIG. 1) is 350-500 mm measured along the center line of the blast furnace.

The thickness of the carbon brick transition layer (H2 in figure 1) is 200-400 mm measured along the center line of the blast furnace.

The thickness of the carbon brick base layer (H1 in FIG. 1) is not less than 1200mm as measured along the center line of the blast furnace.

The carbon brick transition layer 22 is provided with 1 layer of carbon bricks at the position corresponding to the center of the blast furnace, and 2-3 layers of carbon bricks are arranged at the position close to the furnace wall.

The height (h shown in figure 1) of the arc surface of the arc furnace bottom is 300-500 mm.

The carbon brick transition layer and the carbon brick base layer need to be pre-laid, and the carbon brick transition layer and the carbon brick base layer are laid strictly according to the positions during pre-laying during actual laying. When pouring the refractory castable layer, a mould needs to be accurately installed, so that the radian of the top surface of the refractory castable layer is consistent with that of the bottom surface of the refractory castable layer.

Adopt behind the blast furnace bottom structure, the lower part of the coke dead burden heap in the blast furnace also can form with arc stove bottom matched with structure, can increase the loose degree of stock column when the coke dead burden heap floats from top to bottom, makes the blast furnace bottom form the space more easily. During the floating of the dead coke pile, the lower arc area of the coke tends to be flat due to the buoyancy of the molten iron, so that the space between the lower liquid-permeable area and the molten iron circulation area is increased, and the edge circulation strength is reduced.

Adopt blast furnace bottom construction can also avoid the molten iron circulation direct impact edge furnace hearth to form "fat face erosion district" (or called garlic form erosion district) under the centrifugal force effect, disperses into perpendicular effort and slant ascending component force to perpendicular effort to reduce the intensity that the molten iron circulation directly erodees the oven.

The blast furnace bottom structure of the utility model can fundamentally relieve the rapid erosion of the molten iron circulation area. The method is more suitable for large or super-large blast furnaces, can prolong the service life of the blast furnace and reduce the abnormal erosion of the molten iron circulation area.

The above description is only the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the concept of the present invention within the technical scope disclosed in the present invention.

Claims

1. A blast furnace bottom structure is characterized in that the bottom of a blast furnace is an arc bottom; the arc-shaped furnace bottom is characterized in that the shape of an inner contour line of the corresponding central section of the arc-shaped furnace bottom is a semiellipse, the length of a short semi-axis of the semiellipse is the height of an arc-shaped surface of the arc-shaped furnace bottom, and two ends of the semiellipse are tangent to the furnace wall of the corresponding side; the furnace bottom of the blast furnace consists of a refractory castable layer, a carbon brick transition layer and a carbon brick base layer from top to bottom in sequence; the refractory castable layer is of a half-shell structure matched with the shape of the arc furnace bottom, and the thicknesses of all parts are equal; the carbon brick base layer consists of a plurality of layers of carbon bricks which are tiled; the bottom surface of the carbon brick transition layer is a plane, and the top surface is a semi-elliptical surface matched with the arc furnace bottom.

2. The blast furnace bottom structure according to claim 1, wherein the thickness of the refractory castable layer is 350 to 500mm as measured along the center line of the blast furnace.

3. The blast furnace bottom structure according to claim 1, wherein the thickness of the carbon brick transition layer is 200 to 400mm as measured along the center line of the blast furnace.

4. The blast furnace bottom structure according to claim 1, wherein the carbon brick base layer has a thickness of not less than 1200mm as measured along the center line of the blast furnace.

5. The blast furnace bottom structure according to claim 1, wherein the carbon brick transition layer is provided with 1 layer of carbon bricks at the position corresponding to the center of the blast furnace, and 2-3 layers of carbon bricks are arranged at the position close to the furnace wall.

6. The blast furnace bottom structure according to claim 1, wherein the height of the arc surface of the arc bottom is 300 to 500 mm.