CN104928427B

CN104928427B - Blast furnace baking air guide pipe device

Info

Publication number: CN104928427B
Application number: CN201510374771.1A
Authority: CN
Inventors: 季书民; 王宁; 邹庆峰
Original assignee: Xinjiang Bayi Iron and Steel Co Ltd
Current assignee: Xinjiang Bayi Iron and Steel Co Ltd
Priority date: 2015-07-01
Filing date: 2015-07-01
Publication date: 2023-07-04
Anticipated expiration: 2035-07-01
Also published as: CN104928427A

Abstract

The invention discloses a blast furnace drying air guide pipe device, which is provided with 13 air guide pipes in total, wherein each air guide pipe is arranged in an inverted L shape, and the lower end of each air guide pipe is 500mm away from the bottom of a furnace; 1 central air guide pipe is arranged in the center of the blast furnace; 6 inner air guide pipes are arranged on the circumference of the 1/2 distance between the center of the blast furnace and the furnace wall, the horizontal projection of one inner air guide pipe is positioned on the horizontal projection extension line of the center air guide pipe, the inner air guide pipe is a reference air guide pipe, the other four inner air guide pipes are arranged in a central symmetry manner with the center air guide pipe, the included angle between the 5 air guide pipes is 51 degrees, and the included angle between the inner air guide pipe close to the reference air guide pipe and the reference air guide pipe is 27 degrees; the included angle of the other inner air guide pipe on the other side of the horizontal projection of the reference air guide pipe is 51 degrees; 6 outer air guide pipes are arranged on the circumference of the position 2/3 of the distance between the center of the blast furnace and the furnace wall, wherein the included angle between the 4 outer air guide pipes and the reference air guide pipe is 51 degrees, and the remaining two outer air guide pipes are arranged on two outer air guide pipe extension lines in the middle of the 4 outer air guide pipes.

Description

Blast furnace baking air guide pipe device

Technical Field

The invention relates to a blast furnace device for large and medium repair open furnace baking of a blast furnace, in particular to a blast furnace baking air guide pipe device.

Background

Free water and crystal water exist in the lining body of the refractory material after construction and masonry, and correct baking operation is critical for obtaining the high-temperature service performance of the refractory material. Slowly expel the moisture in the masonry, avoid sudden stress, and make specific baking measures to avoid disorder and random operation. After the construction of the refractory lining is finished, the refractory lining is generally required to be naturally dried and maintained for about 7 days after the construction is finished, and can be heated and dried.

After natural drying and curing, a great amount of water still exists in the furnace lining, and a great amount of free water and crystal water must be discharged during the baking process. The surface moisture evaporates at 80-110 ℃, the water draining speed is slowed down, free water and crystal water are continuously discharged at 300 ℃ along with the continuous rising of the temperature, the crystal form conversion and polymerization are completed at 600 ℃, the sintering strength required by design is achieved at 800 ℃, and the thermal stress is completely released. To sufficiently remove deep free water and crystal water and complete the conversion of the crystal form, it is necessary to keep the temperature at 80, 110, 300, 600 ℃ for a period of time. When the blast furnace is used for baking, in order to uniformly heat the refractory materials of the hearth and the furnace body, the temperature in the furnace body is uniform, so that the crystal water and the physical water in the refractory materials slowly and fully overflow, burst and damage to the refractory materials caused by sudden massive evaporation of the water are avoided, thermal stress is generated to damage the refractory materials, and the brick lining is prevented from cracking and deforming in the severe heating process to damage equipment and refractory brickwork, so that the integrity of the brickwork and the integrity of the furnace body are ensured, and the service life of the blast furnace is prolonged. The traditional blast furnace drying method is to directly send hot air into the blast furnace, and the method has the defects that dead areas exist at the bottom of a hearth, the hot air flows difficultly, particularly in a newly built blast furnace, the furnace bottom refractory material is unevenly baked, free water and crystal water cannot be thoroughly dried, and the furnace bottom refractory material is easy to damage due to thermal stress in use, so that the service life is shortened.

Disclosure of Invention

The invention aims to provide a blast furnace drying air guide pipe device which not only can uniformly dry refractory materials at the bottom of a furnace, but also can dry refractory materials at the hearth and the furnace lining, so that hot air uniformly flows upwards from the bottom of the furnace, and the aim of uniformly drying the refractory materials at the furnace body of the blast furnace is fulfilled.

The invention aims to realize that 13 guide pipes which are vertically arranged are arranged in a blast furnace, the diameter of each guide pipe is 108mm, the wall thickness is 5mm, the guide pipes are arranged in an inverted L shape, and the lower ends of the guide pipes are 500mm away from the bottom of the furnace; the bottom of the air guide pipe is provided with a steel plate base, and the 13 air guide pipes are specifically arranged as follows: 1 central air guide pipe is vertically arranged in the center of the blast furnace; 6 inner air guide pipes are vertically arranged on the circumference of the position 1/2 of the distance between the center of the blast furnace and the furnace wall, wherein the horizontal projection of one inner air guide pipe is positioned on the horizontal projection extension line of the center air guide pipe, the inner air guide pipes form a reference air guide pipe, four inner air guide pipes and the center air guide pipe are arranged in a central symmetry mode, the included angle between the 5 air guide pipes is 51 degrees, and the included angle between the inner air guide pipe close to the reference air guide pipe and the reference air guide pipe in the four inner air guide pipes is 27 degrees; the other side of the horizontal projection of the reference air guide pipe is provided with an inner air guide pipe, and the included angle between the inner air guide pipe and the reference air guide pipe is 51 degrees; 6 outer air guide pipes are distributed on the circumference of the position 2/3 of the distance between the center of the blast furnace and the furnace wall, the horizontal projection included angles between the 4 outer air guide pipes and the reference air guide pipe are respectively 51 degrees, and the rest two outer air guide pipes are respectively arranged on the two outer air guide pipe extension lines in the middle of the 4 outer air guide pipes.

The air guide pipe arrangement principle of the invention is that according to the area distribution of the hearth: the central air guide pipe can bake the area with smaller center of the hearth. The 6 inner air guide pipes are evenly arranged and evenly baked in the 1/2 air guide pipes which radiate outwards from the center, and the baking area of the hearth is approximately 45 percent. The other 45% of the oven's baking area is completed by the outer ductwork 2/3 from the center. Because each air guide pipe is uniformly distributed in the area of the hearth, the blown hot air can be uniformly baked when the furnace is baked, so that the furnace body refractory is uniformly heated. Solves the problem of non-uniformity in baking of furnace bottom refractory in the traditional production.

The air guide pipe device can slowly and fully discharge physical water and crystal water in the blast furnace masonry after the blast furnace is overhauled, and prevent the masonry from bursting due to rapid evaporation of a large amount of water. The refractory material of the blast furnace body and the furnace bottom is uniformly and slowly expanded, and the furnace body and the furnace bottom are prevented from generating excessive thermal stress and crystal form transformation, so that the furnace body is prevented from being damaged. The carbon bricks of the furnace bottom and the furnace hearth are reinforced. Ensures that the temperature of the hearth is rapidly increased after the blast furnace is overhauled and opened, and the blast furnace is rapidly and smoothly produced to achieve the production. The air guide pipe not only can uniformly dry the refractory material of the furnace bottom, but also can dry the refractory material of the furnace hearth and the furnace lining, so that hot air uniformly flows upwards from the furnace bottom, and the aim of uniformly drying the refractory material of the blast furnace body is fulfilled.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 is a horizontal projection view of an air duct of the present invention;

fig. 2 is a schematic diagram of a front view structure of an air duct according to the present invention.

Detailed Description

As shown in figures 1 and 2, 13 guide pipes are arranged vertically in the blast furnace, the diameter of each guide pipe is 108mm, the wall thickness is 5mm, the guide pipes are arranged in an inverted L shape, and the lower ends of the guide pipes are 500mm away from the bottom of the furnace; the bottom of the air guide pipe is provided with a steel plate base 4, and the upper end of the air guide pipe is connected with an air inlet 5. The 13 air guide pipes are specifically arranged as follows: 1 central air guide pipe 1 is vertically arranged in the center of the blast furnace; 6 inner air guide pipes 2 are vertically arranged on the circumference of the position of the blast furnace center at the distance of 1/2 from the furnace wall, wherein the horizontal projection of one inner air guide pipe is positioned on the horizontal projection extension line of the central air guide pipe, the inner air guide pipes form a reference air guide pipe 21, four inner air guide pipes 2 and the central air guide pipe 1 are arranged in a central symmetry mode, the included angles between the 5 air guide pipes are respectively 51 degrees, and the included angle between the inner air guide pipe close to the reference air guide pipe and the reference air guide pipe 21 in the four inner air guide pipes is 27 degrees; the other inner air guide pipe is arranged on the other side of the horizontal projection of the reference air guide pipe 21, and the included angle between the inner air guide pipe and the reference air guide pipe 21 is 51 degrees; 6 outer air guide pipes 3 are distributed on the circumference of the position 2/3 of the distance between the center of the blast furnace and the furnace wall, the horizontal projection included angles between the 4 outer air guide pipes 3 and the reference air guide pipe 21 are respectively 51 degrees, and the rest two outer air guide pipes are respectively arranged on the two outer air guide pipe extension lines in the middle of the 4 outer air guide pipes 3.

Claims

1. A blast furnace baking air guide pipe device is characterized in that: 13 air guide pipes which are vertically arranged are arranged in the blast furnace, the upper end of each air guide pipe is connected with an air inlet, the diameter of each air guide pipe is 108mm, the wall thickness is 5mm, the air guide pipes are arranged in an inverted L shape, and the lower ends of the air guide pipes are 500mm away from the furnace bottom; the bottom of the air guide pipe is provided with a steel plate base, the air guide pipes are distributed according to the area of the hearth, and 13 air guide pipes are specifically arranged as follows: 1 central air guide pipe is vertically arranged at the center of the blast furnace, and the central air guide pipe can bake a smaller area of the center of the hearth; 6 inner air guide pipes are evenly arranged on the circumference of the 1/2 distance between the center of the blast furnace and the furnace wall in an outward radiation way, and the 6 inner air guide pipes are evenly baked to bear the baking area of the hearth close to 45 percent; the horizontal projection of one inner air guide pipe is positioned on the horizontal projection extension line of the central air guide pipe, the inner air guide pipe forms a reference air guide pipe, four inner air guide pipes and the central air guide pipe are arranged in a central symmetry mode, the included angle between the 5 air guide pipes is 51 degrees, and the included angle between the inner air guide pipe close to the reference air guide pipe and the reference air guide pipe in the four inner air guide pipes is 27 degrees; the other side of the horizontal projection of the reference air guide pipe is provided with an inner air guide pipe, and the included angle between the inner air guide pipe and the reference air guide pipe is 51 degrees; 6 outer air guide pipes are distributed on the circumference of the position 2/3 of the distance between the center of the blast furnace and the furnace wall, the horizontal projection included angles between the 4 outer air guide pipes and the reference air guide pipe are respectively 51 degrees, the two remaining outer air guide pipes are respectively arranged on the two outer air guide pipe extension lines in the middle of the 4 outer air guide pipes, the baking area of the hearth is completed by the outer air guide pipes which are 2/3 of the distance from the center, and because the air guide pipes are uniformly distributed in the area of the hearth, the blown hot air can be uniformly baked during the baking process, so that the furnace body refractory material is uniformly heated.