CN108977603B

CN108977603B - Repairing method for iron notch frame burn-through of iron-making blast furnace

Info

Publication number: CN108977603B
Application number: CN201810968418.XA
Authority: CN
Inventors: 陈光中; 王军勇; 查广民
Original assignee: China 22MCC Group Corp Ltd
Current assignee: China 22MCC Group Corp Ltd
Priority date: 2018-08-23
Filing date: 2018-08-23
Publication date: 2020-07-31
Anticipated expiration: 2038-08-23
Also published as: CN108977603A

Abstract

The invention relates to a method for repairing burnthrough of an iron notch frame of an iron-making blast furnace. The method comprises the following steps of A, manufacturing a new taphole frame and a pouring core; B. dismantling the burnt-through damaged taphole frame and removing the heat-resistant ceramic taphole combined bricks; C. determining the width of a new taphole frame according to the actual width of the taphole frame, and cutting a pouring opening at the upper end of the new taphole frame; D. welding the new taphole frame with the furnace shell; E. installing a pouring core according to the angle of the molten iron channel; F. pouring high-strength wear-resistant ceramic castable, and tamping by using a vibrating bar in the pouring process; G. heating the pouring core, drying the pouring material, and plugging a pouring material inlet of the iron notch after the pouring is finished; H. and (5) performing pressure grouting on the furnace shell below the taphole again to finish the repair. The high-strength wear-resistant ceramic castable is adopted to replace heat-resistant ceramic taphole combined bricks, a core is poured to reserve a molten iron channel in the castable, and the core is utilized to heat and accelerate the condensation of the castable, so that the repair quality can be ensured, and the production can be quickly recovered.

Description

Repairing method for iron notch frame burn-through of iron-making blast furnace

Technical Field

The invention relates to a building construction method, in particular to a method for repairing a burnthrough of an iron notch frame of an iron-making blast furnace.

Background

The iron notch of the iron-making blast furnace is a device for the blast furnace to smelt molten iron and then to flow out the molten iron, and the working environment of the iron-making blast furnace is high-temperature and high-pressure. The problem that the iron notch is burnt through at high temperature can occur due to the action of high temperature and high pressure for a long time, high-temperature molten iron can splash and flow out from the burnt part, damage and harm are caused to peripheral pipelines, cables and personnel, the danger is very high, and the damaged part needs to be repaired by emergency furnace shutdown. No device and method for rapidly repairing the iron notch exist in China.

Disclosure of Invention

The invention aims to provide a method for repairing the burn-through of the iron notch frame of the iron-making blast furnace, which ensures the repairing quality, has high repairing speed and can quickly recover the production.

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

1. a construction method for burning through an iron notch frame of an iron-making blast furnace comprises the following steps:

A. manufacturing a new taphole frame and a pouring core;

B. dismantling the burnt-through damaged taphole frame and removing the heat-resistant ceramic taphole combined bricks;

C. determining the width of a new taphole frame according to the actual width of the taphole frame, cutting off the redundant part of the inner end of the new taphole frame, beveling the inner end of the new taphole frame, and cutting a pouring opening at the upper end of the new taphole frame;

D. welding the new taphole frame with the furnace shell;

E. installing a pouring core according to the angle of the molten iron channel;

F. pouring high-strength wear-resistant ceramic castable, and tamping by using a vibrating bar in the pouring process;

G. heating the core, drying the casting material, and plugging a casting material inlet of the iron notch after the casting material is dried;

H. and (5) performing pressure grouting on the furnace shell below the taphole again to finish the repair.

Compared with the prior art, the invention adopting the technical scheme has the beneficial effects that:

the invention adopts high-strength wear-resistant ceramic casting material to replace heat-resistant ceramic taphole combined bricks, the core is poured to reserve a molten iron channel in the casting material, and the core is utilized to heat and accelerate the condensation of the casting material, so as to ensure the quick repair of the damaged taphole of the blast furnace, ensure the repair quality and quickly recover the production.

Further, the optimization scheme of the invention is as follows:

the pouring core comprises a first steel pipe and a second steel pipe, the outer diameter of the second steel pipe is larger than that of the first steel pipe, and through holes are uniformly distributed in the first steel pipe.

Drawings

FIG. 1 is a schematic view of a new taphole block according to an embodiment of the invention;

FIG. 2 is a schematic view of the inner end of a new iron notch frame being cut;

FIG. 3 is a schematic view of a pouring opening of the new taphole frame;

FIG. 4 is a schematic view of the welding of the new taphole frame with the furnace shell;

FIG. 5 is a schematic view of a casting core construction according to an embodiment of the present invention;

FIG. 6 is a schematic view of the installation of the pouring core and the new taphole frame;

in the figure: a new taphole frame 1; pouring openings 2; a furnace shell 3; casting a core 4; a first steel pipe 5; a second steel pipe 6; a through hole 7; an asbestos cord 8; the bezel excess 9.

Detailed Description

The invention is further illustrated below with reference to the figures and examples.

Referring to fig. 1, a method for repairing a burnthrough of an ironmaking blast furnace taphole frame comprises the following steps:

A. manufacturing a new taphole frame 1 and a pouring core 4 (shown in figures 1 and 5), wherein the pouring core 4 is formed by welding a first steel pipe 5 and a second steel pipe 6, the outer diameter of the second steel pipe 6 is larger than that of the first steel pipe 5, through holes 7 are uniformly distributed on the second steel pipe 6, and the through holes 7 are used for drying after pouring of a pouring material;

C. determining the width of a new taphole frame 1 according to the width of the removed taphole frame, cutting off the redundant part 9 of the taphole frame at the inner end of the new taphole frame 1 by using a cutting torch (shown in figure 2), beveling the inner end of the new taphole frame 1, and cutting out a pouring opening 2 at the upper end of the new taphole frame 1 (shown in figure 3);

D. welding the new taphole frame 1 with the furnace shell 3;

E. installing a pouring core 4 according to the angle of a molten iron channel, smearing yellow dry oil on the whole pouring core 4, wrapping the whole pouring core 4 by waste newspaper, and wrapping the head of the first steel pipe 5 by a asbestos rope for being convenient to take out in order to prevent the castable from flowing into a furnace in the pouring process;

F. pouring the high-strength wear-resistant ceramic castable, after the pouring core 4 is installed, tamping the castable by using a vibrating rod in the pouring process, removing air bubbles in the castable, and compactly combining the high-strength wear-resistant ceramic castable so as to improve the strength of the castable and ensure the pouring quality of the high-strength wear-resistant ceramic castable;

G. heating the pouring core 4, drying the pouring material, and quickly condensing; after the pouring is finished, blocking an iron notch pouring material inlet, tamping the iron notch pouring material by using a vibrating rod in the pouring process, and extracting a pouring core 4 after the pouring material reaches a certain strength;

H. and (4) performing pressure grouting on the furnace shell below the taphole again by utilizing the holes, filling gaps and gaps, and completing the taphole repair.

The advantages of this embodiment: 1. the high-strength wear-resistant ceramic castable is adopted to replace the original taphole combined bricks, so that the problem that the outside cannot be built is solved; 2. a pouring core with innovative design is adopted, a reserved hole is formed in the pouring material, and the molten iron is ensured to normally flow out of the blast furnace in production; 3. the pouring core is used for heating the pouring material, so that the condensation speed of the pouring material is increased, and the iron notch is quickly repaired.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, which is defined by the appended claims.

Claims

1. A method for repairing the burn-through of an iron notch frame of an iron-making blast furnace is characterized by comprising the following steps:

A. manufacturing a new taphole frame (1) and a pouring core (4), wherein the pouring core (4) is formed by welding a first steel pipe (5) and a second steel pipe (6), the outer diameter of the second steel pipe (6) is larger than that of the first steel pipe (5), through holes (7) are uniformly distributed on the second steel pipe (6), and the through holes (7) are used for drying after pouring of a pouring material;

C. determining the width of a new taphole frame (1) according to the width of the removed taphole frame, cutting off the redundant part (9) of the taphole frame at the inner end of the new taphole frame (1) by using a cutting torch, forming a groove at the inner end of the new taphole frame (1), and cutting a pouring opening (2) at the upper end of the new taphole frame (1);

D. the new taphole frame (1) is welded with the furnace shell (3);

E. installing a pouring core (4) according to the angle of a molten iron channel, smearing yellow dry oil on the whole pouring core (4), wrapping the whole pouring core (4) by waste newspaper, and wrapping the head of the first steel pipe (5) by a asbestos rope for preventing the pouring material from flowing into a furnace in the pouring process so as to be convenient to take out;

F. pouring the high-strength wear-resistant ceramic castable, after the pouring core (4) is installed, tamping the castable by using a vibrating rod in the pouring process, removing air bubbles in the castable, and compactly combining the high-strength wear-resistant ceramic castable so as to improve the strength of the castable and ensure the pouring quality of the high-strength wear-resistant ceramic castable;

G. heating the pouring core (4), drying the pouring material, and quickly condensing; after the pouring is finished, blocking a pouring material inlet of the iron notch, tamping the pouring material by using a vibrating rod in the pouring process, and extracting a pouring core (4) after the pouring material reaches a certain strength;