CN112833674A

CN112833674A - A long-life distribution chute for submerged arc furnace

Info

Publication number: CN112833674A
Application number: CN202110179320.8A
Authority: CN
Inventors: 姚海英; 颜艺专; 邸俊明; 牛强
Original assignee: Inner Mongolia Erdos Electric Power Metallurgy Group Co Ltd
Current assignee: Inner Mongolia Erdos Electric Power Metallurgy Group Co Ltd
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2021-05-25

Abstract

The invention discloses a long-life distribution chute for a submerged arc furnace, comprising: a heat-resistant steel chute; the heat-resistant steel chute is an integral casting structure, and further comprises two side plates, a bottom plate and an end plate; The plates are symmetrically arranged on both sides of the bottom plate, and form a U-shaped chute structure with the bottom plate; the end plates are arranged on the top of the bottom plate; the end plates are respectively connected to the two side plates and the bottom plate; one end of the two side plates close to the end plate is provided with a hanging hole; the advantage of the present invention is that the heat-resistant steel is integrally cast, which effectively enhances the chute's resistance to high temperature, impact and wear. It can greatly improve the service life of the chute. At the same time, it also realizes the solid structure of the chute without welding. There is no need for water cooling during use. Time-consuming maintenance and replacement, reducing the number of shutdowns.

Description

Long-life distribution chute of submerged arc furnace

Technical Field

The invention relates to the technical field of submerged arc furnace feeding devices, in particular to a submerged arc furnace distribution chute.

Background

In the working process of the submerged arc furnace, continuous feeding is needed, and the feeding is mainly realized by distributing through a chute in the furnace. The blast furnace distribution chute mainly has three structural forms: one is a nest type, which mainly comprises a nest plate, a base plate, a heat insulation material and a shell plate, and a certain furnace burden is stored in a small cavity arranged at the bottom of the cavity to form a nest after the material is discharged, so that the direct influence of the subsequent furnace burden on the inner shell of the distribution chute is avoided. The second type is a smooth cloth chute which mainly comprises a casting base body, a detachable sectional assembly lining, a pressing plate and a fastener; the form is common, and the lining plate can be replaced when the abrasion is serious. The combined type chute also comprises a combined type chute structure which is integrally in an assembled type chute structure; the chute of this structure has avoided the direct impact of material stream to wearing and tearing piece, greatly reduced the harm of secondary impact, has reduced structural design's the degree of difficulty, has simplified manufacturing process. However, in the production process of the submerged arc furnace, the technical scheme still faces the problem of high temperature influence, and a water cooling structure is often needed to be matched; such chutes have two disadvantages during use: 1) the service life is short, the service life of the chute made of the common carbon steel is only 6 months, and the chute needs to be replaced when the chute is expired. 2) There is the potential safety hazard of leaking, for the guarantee chute can normally work under high temperature operating mode, need adopt the circulating water to cool off to reduce the service temperature of chute, and conventional chute is formed by the steel sheet welding, and inside is hollow water-cooling channel, if the chute in the use warp to produce can lead to the cooling water to reveal the trouble after the fracture, thereby influence the hot stove production safety in ore deposit. No matter the chute has water leakage accidents in the using process, or the chute must be shut down for maintenance and replacement, which affects the production.

Chinese patent CN210856183U discloses a high temperature resistant blast furnace distribution chute, including that the cross-section in defeated material direction is square chute body and sets up at this internal wear-resisting welt of chute, the outer wall of chute body is adorned outward and is equipped with first baffle, the inner wall of chute body with the second baffle has been installed between the wear-resisting welt. What above-mentioned technical scheme adopted is combined type structure, has realized that the high temperature air environment of chute and blast furnace top separates under the first baffle effect, realizes effectively reducing the chute outer wall and is corroded by external high temperature air oxidation, and the second baffle between wear-resisting welt and the chute body separates the inner wall of wear-resisting welt and chute body, finally makes the inside and outside both sides of chute body all obtain effective protection. However, the composite structure has high assembly cost and inconvenient maintenance, and at the same time, the thermal expansion coefficients of different materials are different in a high-temperature environment, and the stress concentration position is easy to crack.

Disclosure of Invention

In view of the above, the invention provides a long-life distribution chute for a submerged arc furnace, which can solve the above problems.

For this purpose, the present invention is implemented by the following technical means.

A long-life distribution chute of a submerged arc furnace is characterized in that a main body is a heat-resistant steel chute;

the heat-resistant steel chute is of an integral casting structure and further comprises two side plates, a bottom plate and an end plate; the two side plates are symmetrically arranged on two sides of the bottom plate and form a sliding groove structure with a U-shaped section with the bottom plate; the end plate is arranged on the top of the bottom plate; the end plate is respectively connected with the two side plates and the bottom plate;

and one end of each side plate close to the end plate is provided with a suspension hole.

Further, the heat-resistant steel chute comprises chromium and nickel; wherein, the mass fraction of the chromium is 16-32 percent; the mass fraction of the nickel is 18-37%.

Furthermore, the heat-resistant steel chute material comprises rhenium element and zirconium element, and the mass fraction ranges of the two metal elements are both 0.2% -2%.

Furthermore, the thickness of the side plates and the bottom plate is 40mm-60 mm.

Further, the side surfaces of the side plates are convergent, and the width close to the top is larger than the width close to the bottom.

Further, one end, close to the top, of the side plate is provided with an arc-shaped flange, and the suspension hole is located in the flange to form a lifting lug structure.

Furthermore, the included angle between the end plate and the bottom plate is an obtuse angle.

Further, after the heat-resistant steel chute is cast and molded, shot blasting is carried out on the working surface of the bottom plate.

The invention has the following advantages:

through reasonable design and material selection, the high-temperature resistance, impact resistance and abrasion resistance of the chute are effectively enhanced, and the service life of the chute is greatly prolonged. Meanwhile, the non-welded solid structure of the chute is realized through the integral casting molding method, water cooling is not needed in the use process, the potential safety hazard of water leakage in the submerged arc furnace is avoided, the use safety performance of the chute is greatly improved, the time consumption for maintaining and replacing the chute is reduced, and the shutdown times are reduced.

Drawings

In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only one or several embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a side view of the present invention;

FIG. 3 is a top view of the present invention;

figure 4 is a cross-sectional view a-a of figure 3.

In the figure:

1-heat resistant steel chute; 2-side plate; 3-a bottom plate; 4-hanging holes; 5-end plate.

Detailed Description

In the description of the present invention, it is to be understood that the terms "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in fig. 1.

The conception, the specific structure and the technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the schemes and the effects of the present invention. It should be noted that, in the case of no conflict, the features in the embodiments of the present application may be combined with each other.

It should also be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The invention will be further explained with reference to the drawings.

As shown in figure 1, the long-life distribution chute of the submerged arc furnace has a main structure of a heat-resistant steel chute 1;

the heat-resistant steel chute 1 is of an integrated casting structure and is made of heat-resistant steel; preferably, the heat-resistant steel chute 1 is made of chromium and nickel; wherein, the mass fraction of the chromium is 16-32 percent; the mass fraction of nickel is 18-37%; the heat-resistant steel chute 1 also comprises rhenium and zirconium, the mass fractions of the rhenium and the zirconium are 0.2% -2%, and the addition of the rhenium and the zirconium also plays a role in refining grains and increasing strength. As shown in fig. 2, the heat-resistant steel chute 1 further includes two side plates 2, a bottom plate 3, and an end plate 5. As shown in fig. 3 and 4, the two side plates 2 are symmetrically arranged on two sides of the bottom plate 3, and form a sliding chute structure with a U-shaped cross section with the bottom plate 3; the end plate 5 is arranged on the top of the bottom plate 3; the end plate 5 is respectively connected with the two side plates 2 and the bottom plate 3; preferably, the lateral surfaces of the lateral plates 2 are convergent, with a greater width near the top than near the bottom. Referring further to fig. 1 and 2, the included angle between the end plate 5 and the bottom plate 3 is an obtuse angle, so that the blanking is facilitated, and the surface damage caused by the fact that the blanking directly impacts the bottom plate 3 is reduced.

One end of each side plate 2 close to the end plate 5 is provided with a hanging hole 4; preferably, one end of the side plate 2 close to the top is provided with an arc-shaped flange, and the hanging hole 4 is positioned on the flange to form a lifting lug structure for mounting or hanging the chute.

Preferably, the thickness of the side panels 2 and the bottom panel 3 is 40mm to 60 mm.

In another embodiment of the present invention, on the basis of the above embodiment, after the heat-resistant steel chute 1 is cast, the working surface of the bottom plate 3 is shot-blasted. The surface forming quality is improved, and the surface abrasion resistance is further improved.

Although the present invention has been described in detail with reference to examples, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The utility model provides a hot stove long life distribution chute in ore deposit which characterized in that includes: a heat-resistant steel chute (1);

the heat-resistant steel chute (1) is of an integral casting structure and further comprises two side plates (2), a bottom plate (3) and an end plate (5); the two side plates (2) are symmetrically arranged on two sides of the bottom plate (3) and form a sliding groove structure with a U-shaped section with the bottom plate (3); the end plate (5) is arranged at the top of the bottom plate (3); the end plate (5) is respectively connected with the two side plates (2) and the bottom plate (3);

one end of each side plate (2) close to the end plate (5) is provided with a hanging hole (4).

2. The distribution chute according to claim 1, characterized in that the refractory steel chute (1) comprises chromium and nickel; wherein, the mass fraction range of the chromium is 16-32 percent; the mass fraction of the nickel is 18-37%.

3. The distribution chute according to claim 1 or 2, characterized in that the heat-resistant steel chute (1) comprises rhenium and zirconium, both of which are present in a mass fraction range of 0.2-2%.

4. The distribution chute according to claim 1, characterized in that the thickness of the side panels (2) and the bottom panel (3) is 40-60 mm.

5. The distribution chute according to claim 1, characterized in that the side panels (2) are convergent, having a greater width near the top than near the bottom.

6. The distribution chute according to claim 1, characterized in that the side plate (2) is provided with a circular arc-shaped flange at one end near the top, and the hanging hole (4) is positioned on the flange to form a lifting lug structure.

7. The distribution chute according to claim 1, characterized in that the angle between the end plate (5) and the bottom plate (3) is obtuse.

8. The distribution chute according to claim 1, characterized in that the heat-resistant steel chute (1) is cast and formed and that the working surface of the bottom plate (3) is shot-peened.