Novel masonry structure of submerged arc furnace lining

Abstract

The utility model relates to the technical field of industrial silicon submerged arc furnace smelting, in particular to a novel masonry structure of a submerged arc furnace lining, which comprises a furnace lining bottom arranged at the inner bottom of a submerged arc furnace shell. The furnace lining wall is arranged on the inner side wall of the submerged arc furnace shell and comprises an upper ring furnace wall, a middle ring furnace wall and a lower ring furnace wall which are sequentially arranged from top to bottom; wherein the middle ring furnace wall is provided with a protruding part, the protruding part protrudes out of the upper ring furnace wall and the lower ring furnace wall, and the protruding part is gradually shrunk in the direction towards the inner side of the furnace shell. A plurality of protruding parts are arranged on the circumference of the inner side of the middle circle furnace wall, the protruding parts continuously stir the surface of furnace charge, the situation that the furnace charge is hardened in the furnace body is avoided, the air permeability of the surface of the furnace charge is guaranteed, furnace ramming operation does not need to be conducted on the furnace body in the process, and therefore the furnace charge utilization rate is improved. The sealing performance of the industrial silicon in the production and smelting process is ensured, so that the energy consumption is reduced, and the silica recovery rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial silicon ore-fired furnace smelting, in particular to a new type of masonry structure for an ore-fired furnace lining. Background Art

[0002] Industrial silicon, also known as metallic silicon or semi-metallic silicon, is an important industrial material. It is mainly smelted from silica and carbonaceous reducing agents in a submerged arc furnace. During the smelting process of industrial silicon, after the charge has been in the furnace for a certain period of time, a "caking" phenomenon will occur on the surface, which will make the charge's air permeability worse, thus affecting the smelting of industrial silicon. In order to ensure the smooth progress of smelting, the furnace door must be opened every four to eight hours to perform a "ramming" operation to destroy the "caking" of the charge and enhance the air permeability of the charge surface, so that the smelting can proceed smoothly.

[0003] However, this "furnace pounding" operation destroys the airtightness of the industrial silicon smelting process, resulting in problems such as excessive energy consumption and low silica recovery rate. Utility Model Content

[0004] The utility model aims to provide a new type of masonry structure for a lining of an electric arc furnace to solve the problems raised in the above-mentioned background technology.

[0005] The technical solution adopted by the utility model is:

[0006] A new type of masonry structure for a lining of an electric arc furnace, comprising:

[0007] The furnace substrate is arranged at the inner bottom of the furnace shell of the ore-fired furnace;

[0008] The furnace lining wall is located on the inner wall of the furnace shell of the submerged arc furnace and includes:

[0009] The upper furnace wall, the middle furnace wall and the lower furnace wall are arranged in sequence from top to bottom;

[0010] in:

[0011] The middle furnace wall is provided with a raised component, the raised component protrudes from the upper furnace wall and the lower furnace wall, and the raised component gradually shrinks toward the inner side of the furnace shell.

[0012] Preferably, a plurality of raised parts are evenly distributed on the inner circumference of the middle ring furnace wall.

[0013] Preferably, the raised component protrudes from the upper furnace wall and the lower furnace wall by 150 mm to 500 mm.

[0014] Preferably, the raised component is 200 mm to 1500 mm away from the top of the upper furnace wall.

[0015] Preferably, the inner wall at the top end of the lower furnace wall is in the shape of a truncated cone with the larger diameter end facing upward.

[0016] Preferably, the width of the top edge of the lower furnace wall is the same as that of the upper furnace wall.

[0017] Preferably, the raised part protrudes from the top of the lower furnace wall by 150 mm to 500 mm.

[0018] Preferably, the furnace substrate is a carbon brick layer.

[0019] Preferably, the carbon brick layer includes a bottom layer, a middle layer and a top layer, the bottom layer is a prebaked carbon brick, and the middle layer and the top layer are semi-graphite carbon bricks.

[0020] Preferably, the protruding part is cast from refractory material.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] In the utility model, a plurality of raised components are arranged on the inner circumference of the middle furnace wall at a distance of 200mm to 1500mm from the top of the upper furnace wall. The raised components rotate with the furnace body under the drive of the rotating furnace body. During the rotation, the raised components continuously stir the material surface about 200mm to 1500mm below the top of the upper furnace wall, so that the charges are displaced from each other, avoiding the "hardening" of the charges in the furnace body, ensuring the air permeability of the charge surface, and no additional "ramming" operation is required inside the furnace body during this process, thereby ensuring the sealing of industrial silicon during the production and smelting process, thereby reducing energy consumption and improving the silica recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A cross-sectional schematic diagram of the present application;

[0025] Figure 2 This is a top view schematic diagram of the present application.

[0026] Reference numerals:

[0027] 11. upper furnace wall; 12. middle furnace wall; 122. raised part; 13. lower furnace wall;

[0028] 21. Prebaked carbon bricks; 22. Semi-graphite carbon bricks. DETAILED DESCRIPTION

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the present invention are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0031] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0032] like Figure 1-Figure 2 As shown, an embodiment of the utility model provides a new type of masonry structure of the lining of an ore-heating furnace, including a furnace substrate and a furnace lining wall respectively arranged at the bottom and inner wall of the furnace shell of the ore-heating furnace. The charge to be smelted is placed in the furnace, and the surface of the charge is generally level with the furnace mouth.

[0033] The furnace lining wall includes an upper furnace wall 11, a middle furnace wall 12 and a lower furnace wall 13 arranged in sequence from top to bottom. Figure 1 As shown, the upper furnace wall 11 is located at the top of the furnace shell, arranged in the circumferential direction of the inner side of the furnace shell, and the top of the upper furnace hearth 11 is at the furnace mouth. The upper furnace wall 11 is built of refractory materials, which reduces heat loss and can withstand thermal stress and chemical erosion at high temperatures.

[0034] Several raised parts 122 are evenly distributed on the inner circumference of the middle furnace wall 12, and the raised parts 122 are about 200mm to 1500mm away from the top of the upper furnace wall 11. The raised parts 122 protrude from the upper furnace wall 11 to the inside of the furnace shell by about 150mm to 500mm, increasing the contact area between the raised parts 122 and the surface furnace charge when rotating, so that the furnace charge is stirred more fully and the stirring efficiency is improved. When in use, the raised parts 122 rotate with the furnace body under the drive of the rotating furnace body, and the rotating raised parts 122 stir the surface of the furnace charge, and the surface of the furnace charge generates flow to avoid the "hardening" phenomenon, thereby maintaining the air permeability of the surface of the furnace charge. The raised parts 122 gradually shrink in the direction of the inner side of the furnace shell. Preferably, in this embodiment, the raised parts 122 are in the shape of a straight prism with a trapezoidal cross section. The raised parts 122 in the shape of a straight prism are less subject to resistance during the stirring process, which helps the furnace charge to form a better flow path in the furnace body, thereby improving the stirring efficiency. The raised part 122 is made of refractory material, also in order to reduce heat loss and withstand thermal stress and chemical erosion at high temperature.

[0035] The inner wall at the top of the lower furnace wall 13 is in the shape of a truncated cone with a larger diameter and an upward end, and the width of the top edge is the same as that of the upper furnace wall 11. The protruding part 122 protrudes from the top of the lower furnace wall 13 to the inside of the furnace shell by about 150mm to 500mm, which increases the contact area between the protruding part 122 and the surface furnace charge when rotating, and improves the stirring efficiency. Similarly, the lower furnace wall 13 is also built of refractory materials, and its main function is to reduce heat loss and withstand thermal stress and chemical erosion at high temperatures.

[0036] The furnace substrate is a carbon brick layer, which includes a bottom layer, an intermediate layer and a top layer. The bottom layer is a prebaked carbon brick 21, and the intermediate layer and the top layer are semi-graphite carbon bricks 22. The prebaked carbon bricks 21 have a high thermal conductivity. Placing them at the bottom layer of the furnace substrate can enhance the cooling of the furnace substrate, reduce the temperature of the furnace substrate, and help improve the heat conduction efficiency of the entire furnace body. The prebaked carbon bricks 21 can also form a stable protective layer at high temperatures to better protect the furnace substrate. The semi-graphite carbon bricks 22 have high hardness and wear resistance, and can effectively resist the wear of the materials in the furnace. At the same time, it has good thermal shock stability and can withstand rapid temperature changes without breaking easily, thereby extending the service life of the furnace lining.

[0037] During the specific operation, silicon ore and other materials required for smelting industrial silicon are first added into the furnace body, and the furnace body is driven to rotate by a rotating mechanism (not shown in the figure). The rotating furnace body drives the raised component 122 to rotate together, and the rotating raised component 122 continuously stirs the surface of the charge to cause displacement of the charge relative to each other, thereby avoiding the "hardening" of the charge in the furnace body and ensuring the air permeability of the charge surface.

[0038] In this embodiment, a plurality of raised parts 122 are provided on the inner circumference of the middle furnace wall 12 at a distance of 200 mm to 1500 mm from the top of the upper furnace wall 11. The raised parts 122 rotate with the furnace body driven by the rotating furnace body. During the rotation, the raised parts 122 continuously stir the material surface approximately 200 mm to 1500 mm below the top of the upper furnace wall 11, so that the charges are displaced from each other, thereby avoiding the "hardening" of the charges in the furnace body and ensuring the air permeability of the charge surface. In this process, there is no need for additional "ramming" operation inside the furnace body, thereby ensuring the sealing of industrial silicon during the production and smelting process.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A new type of masonry structure for the lining of an electric arc furnace, characterized in that: include: The furnace substrate is arranged at the inner bottom of the furnace shell of the ore-fired furnace; The furnace lining wall is arranged on the inner wall of the furnace shell of the ore-fired furnace, and comprises: an upper furnace wall (11), a middle furnace wall (12) and a lower furnace wall (13) arranged in sequence from top to bottom; in: The middle furnace wall (12) is provided with a raised component (122), the raised component (122) protrudes from the upper furnace wall (11) and the lower furnace wall (13), and the raised component (122) gradually shrinks in a direction toward the inside of the furnace shell.

2. The novel masonry structure of the lining of a submerged arc furnace according to claim 1 is characterized in that: A plurality of protruding parts (122) are evenly distributed on the inner circumference of the middle ring furnace wall (12).

3. The novel masonry structure of the lining of a submerged arc furnace according to claim 1 is characterized in that: The protruding component (122) protrudes from the upper furnace wall (11) and the lower furnace wall (13) by 150 mm to 500 mm.

4. The novel masonry structure of the lining of a submerged arc furnace according to claim 1 is characterized in that: The protruding component (122) is 200 mm to 1500 mm away from the top of the upper furnace wall (11).

5. The novel masonry structure of the lining of a submerged arc furnace according to claim 1 is characterized in that: The inner wall at the top end of the lower furnace wall (13) is in the shape of a truncated cone with a larger diameter and an upward facing end.

6. The novel masonry structure of the lining of a submerged arc furnace according to claim 5 is characterized in that: The width of the top edge of the lower furnace wall (13) is the same as that of the upper furnace wall (11).

7. The novel masonry structure of the lining of a submerged arc furnace according to claim 5 is characterized in that: The raised component (122) protrudes from the top of the lower furnace wall (13) by 150 mm to 500 mm.

8. The novel masonry structure of the lining of a submerged arc furnace according to claim 1 is characterized in that: The furnace substrate is a carbon brick layer.

9. The novel masonry structure of the lining of a submerged arc furnace according to claim 8 is characterized in that: The carbon brick layer comprises a bottom layer, a middle layer and a top layer, the bottom layer is a prebaked carbon brick (21), and the middle layer and the top layer are semi-graphite carbon bricks (22).

10. The novel masonry structure of the lining of a submerged arc furnace according to claim 1 is characterized in that: The protruding part (122) is cast from a refractory material.

Images