CN213120116U

CN213120116U - Energy-saving direct-current submerged arc furnace

Info

Publication number: CN213120116U
Application number: CN202020991381.5U
Authority: CN
Inventors: 王宁宇; 韩伟; 王延年; 孙学文
Original assignee: Ningxia Ronghuayuan Special New Material Co ltd
Current assignee: Ningxia Ronghuayuan Special New Material Co ltd
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2021-05-04
Anticipated expiration: 2030-06-03

Abstract

The utility model provides an energy-conserving direct current hot stove in ore deposit, this hot stove in ore deposit includes: the single electrode is vertically arranged in the center of the furnace core, the furnace bottom electrode is arranged at the bottom of the furnace body, and the furnace side electrode is arranged in the furnace wall, wherein the furnace bottom electrode and the furnace side electrode are connected with the anode of the rectified direct current power supply, the single electrode is connected with the cathode of the rectified direct current power supply, and the furnace bottom electrode and the furnace side electrode are arranged at the bottom and the side surface of the furnace body in decibels, so that electric arcs can be generated between the single electrode and the electrodes in different directions.

Description

Energy-saving direct-current submerged arc furnace

Technical Field

The utility model relates to a hot stove in direct current ore deposit especially relates to a hot stove in energy-conserving direct current ore deposit.

Background

The direct current electric furnace arc has the advantages of small voltage fluctuation and flicker, less graphite electrode consumption, low operation noise, less refractory material consumption and the like, is applied to the metallurgy industry, and the bottom electrode technology is one of key technologies in the direct current furnace technology.

However, the single bottom electrode technology has the disadvantages that electric arcs between the cathode rods and the bottom electrode are too concentrated in the middle of the furnace body due to the fact that the cathode rods are arranged right above the bottom electrode, heat is always transferred from top to bottom, the bottom electrode is in a high-temperature and high-pressure working environment for a long time, the bottom electrode is too fast in self consumption and short in service life, and in addition, the heat is too concentrated in the middle of the furnace body, and the raw materials in the whole submerged arc furnace are not beneficial to refining.

SUMMERY OF THE UTILITY MODEL

The utility model provides an energy-saving direct-current ore heating furnace for solving the problems existing in the prior art.

This hot stove in ore deposit includes: the furnace comprises a single electrode vertically arranged in the center of a furnace core, a furnace bottom electrode arranged at the bottom of a furnace body and a furnace side electrode arranged in a furnace wall, wherein the furnace bottom electrode and the furnace side electrode are connected with the anode of a rectified direct current power supply, and the single electrode is connected with the cathode of the rectified direct current power supply.

Furthermore, in order to ensure that the electrodes can heat smelting raw materials in each area in the furnace body, three furnace side electrodes which are uniformly distributed at 120 degrees around the single electrode are wrapped in the submerged arc furnace wall, and the furnace bottom electrode and the furnace side electrode are both connected with the anode of the rectification direct current power supply through a branch with a switch.

Furthermore, the outmost layer of the submerged arc furnace comprises a furnace shell, the innermost layer of the submerged arc furnace is a refractory protective brick, a ramming material layer consisting of a magnesium-calcium ramming material and an electric conducting ramming material is arranged between the furnace shell and the refractory protective brick, and the electric conducting ramming material is preferably a magnesium-carbon ramming material and has good electric conductivity.

Further, the plate electrode of stove side electrode is wrapped up by the ramming material layer, is provided with a plurality of copper posts towards the furnace core direction on the plate electrode and the electric copper bar that connects that stretches out outside the furnace body, is electrically conductive ramming material between copper post and the furnace core, is magnesium calcium ramming material between plate electrode and the stove outer covering, does benefit to the copper post that nevertheless electrode direction stretches out and produces electric arc between negative pole and the positive pole more, sets up the region that a plurality of dispersed copper posts made electric arc heating bigger.

Furthermore, the copper column of the furnace bottom electrode is wrapped by the upper conductive ramming material, a fireproof high-alumina brick is laid between the lower part of the furnace bottom electrode and the furnace shell, and an electric connection copper bar integrally formed with the furnace bottom electrode extends outwards from the space between the magnesia-calcium ramming material and the high-alumina brick.

Furthermore, the furnace shell is a copper cooling wall, and a fireproof insulating layer is arranged between the copper cooling wall and the extended power connection copper bar.

The technical effects of the utility model reside in that: the furnace side electrode is added in the furnace wall of the single-electrode submerged arc furnace and evenly divided into evenly distributed trisections, each group of the furnace side electrode and the bottom electrode can be connected with the anode of a rectification direct-current power supply, and an independent control switch is arranged on each connected path. During smelting, electric arcs can be generated between the middle cathode single electrode and the bottom electrode and between the middle cathode single electrode and the furnace side electrode, and heat energy is accelerated to spread from the furnace core to the periphery of the furnace wall. And the switch on any branch can be controlled, the main heating area is selected, more efficient and accurate energy control is realized, the utilization rate of electric energy is improved, the energy consumption is saved, and the consumption of the bottom electrode is reduced.

Drawings

FIG. 1 is a diagram showing the connection between the electrode and the control power supply of the DC submerged arc furnace of the present invention;

fig. 2 is a sectional view of the electrode structure inside the furnace body of the present invention.

In the figure, 1, a furnace shell, 2, a single electrode, 3, a furnace bottom electrode, 4, a furnace side electrode, 5, an electric conduction ramming material, 6, a magnesium-calcium ramming material, 7, a high-alumina brick, 8, a fireproof protection brick, 9, an electric connection copper bar, 10, a rectification direct-current power supply, 11, a fireproof insulation layer, 41, an electrode plate and 42, a copper column.

Detailed Description

The following describes embodiments of the present invention with reference to fig. 1 to 2.

FIG. 1 shows the connection relationship between the electrodes on the DC submerged arc furnace and the control power supply, the furnace bottom electrode 3 and the furnace side electrode 4 are connected with the anode of the rectification DC power supply 10, the single electrode 2 is connected with the cathode of the rectification DC power supply 10, three furnace side electrodes 4 uniformly distributed at 120 degrees around the single electrode 2 are wrapped in the submerged arc furnace wall, and the furnace bottom electrode 3 and the furnace side electrodes 4 are both connected with the anode of the rectification DC power supply 10 through a branch with a switch.

Fig. 2 illustrates the structure inside the furnace body of the submerged arc furnace, which includes: a single electrode 2 vertically arranged in the center of the furnace core, a furnace bottom electrode 3 arranged at the bottom of the furnace body, and a furnace side electrode 4 arranged in the furnace wall; the outermost layer of the submerged arc furnace comprises a furnace shell 1, the innermost layer of the submerged arc furnace is a refractory protective brick 8, a ramming material layer consisting of a magnesium-calcium ramming material 6 and an electrically conductive ramming material 5 is arranged between the furnace shell 1 and the refractory protective brick 8, an electrode plate 41 of a furnace side electrode 4 is wrapped by the ramming material layer, a plurality of copper columns 42 facing the furnace center direction and electrically connected copper bars 9 extending out of the furnace body are arranged on the electrode plate 41, the electrically conductive ramming material 5 is arranged between the copper columns 42 and the furnace center, and the magnesium-calcium ramming material 6 is arranged between the electrode plate 41 and the furnace shell 1; the copper column 42 of stove bottom electrode 3 is wrapped up by the electrically conductive ramming mass 5 on upper strata, is laying fire-resistant high-alumina brick 7 between the lower part of stove bottom electrode 3 and stove outer covering 1, and the electricity copper bar 9 that connects with stove bottom electrode 3 integrated into one piece outwards stretches out from between magnesium calcium ramming mass 6 and the high-alumina brick 7, stove outer covering 1 is the copper cooling wall, sets up fire-resistant insulating layer 11 between copper cooling wall and the electricity copper bar 9 that stretches out.

The working principle is as follows: the bottom electrode 3 and the side electrode 4 are arranged at the bottom and the side of the furnace body in decibel, so that electric arcs can be generated between the single electrode 2 and the electrodes in different directions, the copper columns 42 are arranged on the bottom electrode 3 and the side electrode 4 facing the furnace core, in order to prevent metallurgical raw materials from directly contacting the copper columns 42, a conductive ramming material 5 with certain thickness is arranged between the copper columns 42 and the smelting pool, besides the conductive ramming material 5, magnesium calcium ramming materials 6 are filled around the bottom electrode 3 and the side electrode 4, the single electrode 2 is connected with the cathode of the rectifying direct current power supply 10, other electrodes extend out of the furnace body through an electric copper bar 9 and are connected with the anode of the rectifying direct current power supply 10, switches are arranged on connecting branches, so that the heating control of the furnace body can be more flexible, efficient and accurate, if the heating temperature of the partial area in the furnace body is found to be lower, the connection between the rectifying direct current power supply 10 and other anode electrodes is cut off through the switches, the anode electrode of the area can be made to constitute a more powerful heating loop with the single electrode 2 alone.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims

1. An energy-saving direct-current submerged arc furnace is characterized by comprising: the furnace comprises a single electrode (2) vertically arranged in the center of a furnace core, a furnace bottom electrode (3) arranged at the bottom of a furnace body and a furnace side electrode (4) arranged in a furnace wall, wherein the furnace bottom electrode (3) and the furnace side electrode (4) are connected with the anode of a rectified direct current power supply (10), and the single electrode (2) is connected with the cathode of the rectified direct current power supply (10).

2. The energy-saving dc submerged arc furnace according to claim 1, characterized in that three furnace side electrodes (4) are wrapped in the submerged arc furnace wall and evenly distributed at 120 ° around the single electrode (2), and the furnace bottom electrode (3) and the furnace side electrode (4) are both connected to the anode of the rectified dc power supply (10) through a branch with a switch.

3. The energy-saving DC submerged arc furnace according to claim 2, characterized in that the outermost layer of the submerged arc furnace comprises a furnace shell (1), the innermost layer of the submerged arc furnace is a refractory protective brick (8), and a ramming material layer consisting of a magnesium-calcium ramming material (6) and an electrically conductive ramming material (5) is arranged between the furnace shell (1) and the refractory protective brick (8).

4. The energy-saving DC submerged arc furnace according to claim 3, characterized in that the electrode plate (41) of the furnace side electrode (4) is wrapped by a ramming mass layer, the electrode plate (41) is provided with a plurality of copper columns (42) towards the furnace core direction and an electric copper bar (9) extending out of the furnace body, an electric ramming mass (5) is arranged between the copper columns (42) and the furnace core, and a magnesium-calcium ramming mass (6) is arranged between the electrode plate (41) and the furnace shell (1).

5. The energy-saving DC submerged arc furnace according to claim 3, characterized in that the copper cylinder (42) of the bottom electrode (3) is wrapped by the upper conductive ramming mass (5), a refractory high alumina brick (7) is laid between the lower part of the bottom electrode (3) and the furnace shell (1), and the electric copper bar (9) integrally formed with the bottom electrode (3) extends outwards from between the magnesia-calcium ramming mass (6) and the high alumina brick (7).

6. The energy-saving DC submerged arc furnace according to any of the claims 3 to 5, characterized in that the furnace shell (1) is a copper cooling wall, and a refractory insulating layer (11) is arranged between the copper cooling wall and the extended electrified copper bar (9).