CN216337752U

CN216337752U - Novel furnace lining structure for integral casting forming of large-scale blast furnace

Info

Publication number: CN216337752U
Application number: CN202121148845.7U
Authority: CN
Inventors: 王雪峰; 李爱锋; 马辉; 李胜杰; 陈建伟; 姜玉正; 姜玉毅; 郑义勍; 付萌萌; 牛富军; 林银波; 郭曙光; 焦虎丰; 杜静; 赵恒山
Original assignee: Anyang Iron and Steel Co Ltd
Current assignee: Anyang Iron and Steel Co Ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2022-04-19
Anticipated expiration: 2031-05-26

Abstract

The utility model provides a novel furnace lining structure for integral casting molding of a large-scale blast furnace, which is characterized in that: the furnace lining of the cooling wall at the lower part of the blast furnace is a silicon carbide corundum layer which is integrally cast; the furnace lining of the cooling wall at the middle part of the blast furnace is a silicon carbide corundum layer which is integrally cast; the furnace lining of the upper cooling wall in the blast furnace is a steel fiber ceramic corundum layer which is integrally cast; the furnace lining of the cooling wall at the upper part of the blast furnace is a steel fiber ceramic corundum layer which is integrally cast. The utility model is a lining structure of large-scale blast furnace with simple construction, stable furnace shape and long service life.

Description

Novel furnace lining structure for integral casting forming of large-scale blast furnace

Technical Field

The utility model belongs to the field of iron-making blast furnace structures, and particularly relates to a novel furnace lining structure integrally cast and formed by a large-scale blast furnace.

Background

The traditional blast furnace lining, especially the tuyere zone and the cooling walls above the tuyere zone, mainly adopts the brick lining structure built by shaped refractory materials (firebricks).

As shown in fig. 1:

the cooling wall of the large-scale blast furnace comprises the following components: a section D of a cooling wall at the lower part of the blast furnace, a section C of a cooling wall at the middle part of the blast furnace, a section B of a cooling wall at the upper part of the blast furnace and a section A of a cooling wall at the upper part of the blast furnace.

As shown in fig. 2: a section D of a cooling wall at the lower part of the blast furnace, wherein the furnace lining of the section is a special spray coating layer 4';

as shown in fig. 3: blast furnace middle cooling wall C section: the lining of the zone is Si₄N₄-a SiC brick layer 3';

as shown in fig. 4: section B of the upper cooling wall in the blast furnace: the furnace lining of the area is a phosphoric acid-soaked clay brick layer 2';

as shown in fig. 5: section A of the upper cooling wall of the blast furnace: the lining of the zone is a phosphoric acid-soaked clay brick layer 1'.

The brick lining structure is built by a large number of refractory bricks, and has the following defects:

firstly, the brick lining structure has long construction preparation period, and the brick lining structure has higher processing difficulty and higher building difficulty due to the related requirements of brick joints, flatness and the like in the construction process;

secondly, in the production process of the blast furnace, the refractory bricks are easy to break and fall off due to high temperature, high pressure, mechanical scouring of gas flow, erosion of various physical and chemical reactions and other reasons in the furnace, and the falling off of the refractory bricks at individual parts easily causes the connection pieces of the refractory bricks at adjacent regions to fall off due to the existence of a large number of brick seams in the brick lining structure, thereby causing serious influence on the safety of the cooling wall and the furnace shell;

thirdly, a large number of brick joints exist in the brick lining structure, and because the strength and the anti-corrosion performance of slurry in the brick joints are relatively poor, harmful elements such as potassium, sodium, lead, zinc and the like in the blast furnace are easy to drill into the brick joints, abnormal expansion is formed to destroy the brick lining, and the wall thickness or the accretion of the blast furnace is formed to cause the abnormal condition of the blast furnace.

Disclosure of Invention

The utility model provides a novel furnace lining structure for a large-scale blast furnace, which is formed by integral casting, aims to overcome the defects of the prior art and provides the furnace lining structure for the large-scale blast furnace, which is simple in construction, stable in furnace shape and long in service life.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the utility model provides a fashioned novel furnace lining structure is pour to large-scale blast furnace whole which characterized in that:

the furnace lining of the cooling wall at the lower part of the blast furnace is a silicon carbide corundum layer which is integrally cast;

the furnace lining of the cooling wall at the middle part of the blast furnace is a silicon carbide corundum layer which is integrally cast;

the furnace lining of the upper cooling wall in the blast furnace is a steel fiber ceramic corundum layer which is integrally cast;

the furnace lining of the cooling wall at the upper part of the blast furnace is a steel fiber ceramic corundum layer which is integrally cast.

Further, the furnace linings of the cooling wall at the lower part of the blast furnace and the cooling wall at the upper part of the blast furnace are silicon carbide corundum layers which are integrally cast; the furnace lining of the upper cooling wall of the blast furnace and the furnace lining of the upper cooling wall of the blast furnace are steel fiber ceramic corundum layers which are integrally cast.

Has the advantages that:

(1) the construction is simple, the formwork is erected for pouring, and the requirements of the processing size of the brickwork and the size of the brick joint gap during masonry are not considered.

(2) The structure integrity is good, the defect that a brick lining structure has a large number of gaps is eliminated, only a small number of expansion gaps are reserved, the condition that a large area of connected pieces fall off after a certain part falls off is avoided, the furnace shape is kept relatively stable, and the smooth operation of the blast furnace is facilitated.

(3) As most of brick joints are eliminated, the erosion resistance of the integrally cast furnace lining to harmful elements is enhanced, and the service life of the furnace lining is prolonged.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

FIG. 1 is a cross-sectional view of the prior art;

FIG. 2 is an enlarged view of portion D' of FIG. 1;

FIG. 3 is an enlarged view of section C' of FIG. 1;

FIG. 4 is an enlarged view of portion B' of FIG. 1;

FIG. 5 is an enlarged view of portion A' of FIG. 1;

FIG. 6 is a cross-sectional view of the present invention;

FIG. 7 is an enlarged view of the portion A' of FIG. 6;

FIG. 8 is an enlarged view of the portion B' of FIG. 6;

FIG. 9 is an enlarged view of the portion C' of FIG. 6;

FIG. 10 is an enlarged view of the portion D' of FIG. 6;

Detailed Description

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained according to the drawings without inventive labor. In order to facilitate an understanding of the utility model, the utility model is described in more detail below with reference to the accompanying drawings and specific examples.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. As used in this specification, the terms "upper," "lower," "inner," "outer," "bottom," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the utility model and simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

(1) After the cooling wall of the blast furnace is installed, a formwork is erected in the furnace to carry out integral casting, and finally a novel furnace lining structure is formed. And the formwork support is firstly to install the support frame in all spaces in the furnace, and then the layered formwork is installed according to the actual pouring progress.

(2) The integral casting range comprises the whole furnace body area below the furnace hearth, the furnace belly, the furnace waist and the furnace throat steel bricks, and special areas such as an iron notch, a tuyere and the like.

(3) According to the damage mechanism of the cooling wall at different parts of the blast furnace, a proper pouring material is selected, and the unshaped refractory material replaces the shaped refractory material (refractory brick).

The utility model will be further illustrated with reference to specific embodiments:

example 1:

2200m from a certain steel mill³The novel furnace lining structure formed by integral casting is adopted for the middle maintenance of the blast furnace as an example.

(1) Selection of pouring construction parameters

The control range of the pouring capacity is 8-10 t/h; the control range of the total casting thickness is 150-200 mm.

(2) Selection of pouring construction materials

Different pouring materials are adopted according to different parts of the furnace body.

As shown in fig. 6:

As shown in fig. 7: and D sections of the cooling walls of the lower part of the blast furnace are cast to be 150mm thick (40 mm without grooves). The total height of the three-layer copper cooling wall is 7510 mm. The furnace lining of the area is a silicon carbide corundum layer 4' which is integrally formed by pouring and has high temperature resistance, slag iron corrosion resistance, thermal shock resistance and scouring resistance;

as shown in fig. 8: section C of the cooling wall at the middle part of the blast furnace: casting Si of prior art with a thickness of 150mm (75 mm without a groove)₄N₄The SiC brick is changed into a silicon carbide corundum castable material which is resistant to high temperature, slag and iron corrosion, thermal shock and scouring. The furnace lining of the area is a silicon carbide corundum layer 3' which is integrally cast;

the silicon carbide corundum layer 4 '' and the silicon carbide corundum layer 3 '' can be integrally formed by one-time pouring, and gaps are further reduced.

As shown in fig. 9: section B of the upper cooling wall in the blast furnace: the casting thickness is 150mm (75 mm in the groove is not contained), and the phosphoric acid-soaked clay brick in the prior art is changed into the steel fiber ceramic corundum castable with mechanical wear resistance and thermal shock resistance. The furnace lining of the area is a steel fiber ceramic corundum layer 2' which is integrally cast;

as shown in fig. 10: section A of the upper cooling wall of the blast furnace: the casting thickness is 150mm (75 mm in the groove is not contained), and the phosphoric acid-soaked clay brick in the prior art is changed into the steel fiber ceramic corundum castable with mechanical wear resistance and thermal shock resistance. The furnace lining of the area is a steel fiber ceramic corundum layer 1 '' which is integrally formed by pouring.

The steel fiber ceramic corundum layer 2 'and the steel fiber ceramic corundum layer 1' can be integrally formed by one-step pouring, and gaps are further reduced.

Repairing a hearth, a tuyere and a hearth part: and integrally pouring and repairing the tuyere and the taphole area according to the actual erosion conditions of the tuyere and the hearth of the blast furnace.

The height of the built support formwork in the integral casting furnace reaches 26 m (from the central line of the taphole to the lower edge of the throat steel brick), and the method belongs to domestic initiatives. The hot surface pouring of the cooling wall is one-time integral forming pouring, and the erosion of steam and alkali metal to the cooling wall is effectively resisted. Original intact refractory materials are utilized to the great extent, material waste in maintenance engineering is avoided, the whole construction period is only 23 days, and tens of millions of maintenance costs are saved for enterprises.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a fashioned novel furnace lining structure is pour to large-scale blast furnace whole which characterized in that: the furnace lining of the cooling wall at the lower part of the blast furnace is a silicon carbide corundum layer which is integrally cast; the furnace lining of the cooling wall at the middle part of the blast furnace is a silicon carbide corundum layer which is integrally cast; the furnace lining of the upper cooling wall in the blast furnace is a steel fiber ceramic corundum layer which is integrally cast; the furnace lining of the cooling wall at the upper part of the blast furnace is a steel fiber ceramic corundum layer which is integrally cast.

2. The novel lining structure of the large-scale blast furnace formed by integral casting according to claim 1, wherein: the furnace lining of the cooling wall at the lower part of the blast furnace and the furnace lining of the cooling wall at the upper part of the blast furnace are silicon carbide corundum layers which are integrally cast; the furnace lining of the upper cooling wall of the blast furnace and the furnace lining of the upper cooling wall of the blast furnace are steel fiber ceramic corundum layers which are integrally cast.