CN217265833U

CN217265833U - Connecting structure of blast furnace hearth and furnace bottom

Info

Publication number: CN217265833U
Application number: CN202220174655.0U
Authority: CN
Inventors: 刘岩; 赵鸿波; 乔军; 马利科
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: 2022-08-23
Anticipated expiration: 2032-01-21

Abstract

The utility model relates to a connecting structure of a blast furnace hearth and a furnace bottom, wherein the hearth and the furnace bottom are integrally cast and molded by adopting unshaped refractory materials, and the hearth and the furnace bottom are in fillet transition; the outer side of the amorphous refractory material pouring layer is a refractory brick masonry, wherein furnace wall refractory bricks are arranged between the outer side of the hearth and the furnace shell armor, furnace bottom refractory bricks are arranged at the lower part of the furnace bottom, and transition refractory bricks are arranged at the outer side of the joint of the hearth and the furnace bottom; the transition refractory bricks are multilayer step-shaped refractory bricks matched with the transition fillets. The utility model provides high hearth and stove bottom connected region's resistant material thickness to realize seamless connection, stop because of the erosion problem that the resistant firebrick gap leads to, improved the mobility of this regional high temperature slag iron, reduced the erosion and corrosion to this regional resistant material.

Description

Connecting structure of blast furnace hearth and furnace bottom

Technical Field

The utility model relates to a blast furnace design technical field especially relates to a connection structure of blast furnace hearth and stove bottom.

Background

At present, a blast furnace hearth is generally built in a cylindrical structure, the outer layer is high-heat-conductivity carbon bricks, the inner layer is a ceramic cup, and the joint of the hearth and the furnace bottom is built vertically. The ceramic cup is made of refractory materials combined by ceramics in the working areas of the bottom and the hearth of the blast furnace, 2-3 layers of refractory bricks are vertically built at the bottom, the matched cup walls are annularly built on the outer sides of the carbon bricks by adopting various brick-shaped refractory materials, and a cup-shaped ceramic lining is formed in the hearth area.

In the long-term production process, the phenomenon of 'elephant foot type' corrosion is easily caused in the connecting area of the hearth and the ceramic pad at the bottom of the furnace, and the damage investigation of a plurality of domestic blast furnaces finds that the part is the most serious area of the blast furnace hearth corrosion, thereby seriously restricting the long service life of the blast furnace and being not beneficial to the development requirements of low carbon, energy conservation and consumption reduction in the ferrous metallurgy industry.

Disclosure of Invention

The utility model provides a connection structure of blast furnace hearth and stove bottom, junction adopt the integrative casting shaping's of circular arc transition structure, have improved hearth and stove bottom connected region's resistant material thickness to realize seamless connection, stop because of the erosion problem that the resistant firebrick gap leads to, improved the mobility of this regional high temperature slag iron, reduced the erosion and corrosion to this regional resistant material.

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

a connecting structure of a blast furnace hearth and a furnace bottom is characterized in that the hearth and the furnace bottom are integrally cast and molded by using unshaped refractory materials, and the hearth and the furnace bottom are in fillet transition; the outer side of the unshaped refractory material pouring layer is a refractory brick masonry, wherein furnace wall refractory bricks are arranged between the outer side of the hearth and the furnace shell steel armor, furnace bottom refractory bricks are arranged at the lower part of the furnace bottom, and transition refractory bricks are arranged at the outer side of the joint of the hearth and the furnace bottom; the transition refractory bricks are multilayer step-shaped refractory bricks matched with the transition fillets.

The transition fillet between the hearth and the bottom is 1/4 circumference fillet.

The refractory brick masonry is composed of high-heat-conductivity carbon bricks.

The unshaped refractory material is a high-alumina refractory castable.

The multilayer step-shaped refractory bricks form at least 4 steps.

The casting thickness of the amorphous refractory material casting layer corresponding to the hearth is 500-550 mm, and the casting thickness of the amorphous refractory material casting layer corresponding to the hearth is 600-700 mm.

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

(1) the refractory thickness of the connection area of the hearth and the furnace bottom is improved, and the anti-corrosion capability is enhanced;

(2) the furnace hearth and the furnace bottom are integrally cast and formed by adopting unshaped refractory materials, the joint is seamless, and abnormal erosion caused by iron infiltration of refractory brick seams commonly existing at the part at present can be effectively avoided;

(3) the furnace hearth and the furnace bottom are connected in a circular arc transition mode instead of a conventional vertical connection mode, so that the fluidity of high-temperature iron slag in the area is improved, the abnormal scouring of the flowing high-temperature molten iron on the connection part can be effectively reduced, and the abnormal erosion is avoided.

Drawings

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

In the figure: 1. furnace shell steel armor 2, furnace wall refractory bricks 3, unshaped refractory material pouring layer 31, hearth 32, furnace bottom 4, transition refractory bricks 5 and furnace bottom refractory bricks

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, in the connection structure of the blast furnace hearth and the furnace bottom of the utility model, the hearth 31 and the furnace bottom 32 are integrally cast and formed by adopting an unshaped refractory material, and the hearth 31 and the furnace bottom 32 are in fillet transition; the outer side of the amorphous refractory material pouring layer 3 is a refractory brick masonry, wherein furnace wall refractory bricks 2 are arranged between the outer side of the hearth 31 and the furnace shell steel armor 1, furnace bottom refractory bricks 5 are arranged at the lower part of the furnace bottom 32, and transition refractory bricks 4 are arranged at the outer side of the joint of the hearth 31 and the furnace bottom 32; the transition refractory bricks 4 are multilayer stepped refractory bricks matched with transition fillets.

The transition between hearth 31 and hearth 32 is a circumferential fillet of 1/4.

The unshaped refractory material is a high-alumina refractory castable.

The transition refractory bricks 4 form at least 4 steps.

A connection structure of blast furnace hearth and furnace bottom, the construction step is as follows:

(1) after the refractory bricks 5 at the furnace bottom are built, the transitional refractory bricks 4 are built along the ring at the position close to the steel shell 1, wherein the thickness of the refractory bricks forming the lowest step of the transitional refractory bricks 4 is similar to that of the furnace bottom after pouring; the outer side surfaces of the transition refractory bricks of all steps are tightly attached to the furnace shell steel armor 1, but the length of the transition refractory bricks 4 of all steps is gradually reduced from bottom to top, and a stepped structure is formed on the inner side; the masonry position of the transitional refractory bricks 4 corresponds to the connection position (arc transition position) of the hearth and the hearth; continuously building the furnace wall refractory bricks 2 upwards at the tops of the transition refractory bricks 4;

(2) pouring a hearth and bottom area of an integrated structure by using a high-alumina refractory castable on the inner side of a refractory brick masonry consisting of a hearth refractory brick 5, a transition refractory brick 4 and a furnace wall refractory brick 2;

(3) the unshaped refractory pouring layer 3 can be used after being dried to be completely dried and formed.

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 connecting structure of a blast furnace hearth and a furnace bottom is characterized in that the hearth and the furnace bottom are integrally cast and formed by amorphous refractory materials, and the hearth and the furnace bottom are in fillet transition; the outer side of the amorphous refractory material pouring layer is a refractory brick masonry, wherein furnace wall refractory bricks are arranged between the outer side of the hearth and the furnace shell armor, furnace bottom refractory bricks are arranged at the lower part of the furnace bottom, and transition refractory bricks are arranged at the outer side of the joint of the hearth and the furnace bottom; the transition refractory bricks are multilayer step-shaped refractory bricks matched with the transition fillets.

2. The blast furnace hearth and floor connection of claim 1, wherein said transition fillet between said hearth and said floor is 1/4 circumferential fillet.

3. The connecting structure of a blast furnace hearth and a blast furnace bottom according to claim 1, wherein said brickwork is composed of highly heat conductive carbon bricks.

4. The connecting structure of a blast furnace hearth and a blast furnace bottom according to claim 1, wherein said amorphous refractory material is a high alumina refractory castable.

5. The blast furnace hearth-and-bottom connecting structure according to claim 1, wherein said multi-step refractory bricks form at least 4 steps.

6. The connecting structure of the blast furnace hearth and the blast furnace bottom according to claim 1, wherein the casting thickness of the amorphous refractory material casting layer corresponding to the hearth is 500-550 mm, and the casting thickness of the amorphous refractory material casting layer corresponding to the blast furnace bottom is 600-700 mm.