CN218566189U

CN218566189U - Device for improving electrode roasting quality of submerged arc furnace

Info

Publication number: CN218566189U
Application number: CN202222749588.3U
Authority: CN
Inventors: 李军社; 梁兴伟; 史俊; 王小平; 范晋广; 成宏伟
Original assignee: Shanxi Taigang Wanbang Charge Co ltd
Current assignee: Shanxi Taigang Wanbang Charge Co ltd
Priority date: 2022-10-18
Filing date: 2022-10-18
Publication date: 2023-03-03
Anticipated expiration: 2032-10-18

Abstract

The utility model discloses a device for improving the electrode roasting quality of a submerged arc furnace, which comprises an electrode cylinder, wherein rib plates are uniformly arranged on the inner wall of the electrode cylinder, holes are arranged on the rib plates in parallel from top to bottom, the holes are of an approximately rectangular structure, and the internal right-angle positions of the holes are in arc transition; the blank pressing depth of two ends of the electrode cylinder is 5mm; the electrode cylinder is connected with a transformer, and the current passing through the device is controlled by the transformer. The utility model discloses a redesign electrode section of thick bamboo structure and size to control appropriate calcination process technological parameter, electrode strength after the sintering is high, consume lowly, and electrode turn around, fracture accident number of times reduce by a wide margin, and ton iron electrode paste consumes and reduces to 7.5kg/t.

Description

Device for improving electrode roasting quality of submerged arc furnace

Technical Field

The utility model relates to a promote hot stove electrode calcination quality's in ore deposit device belongs to ferroalloy and smelts technical field.

Background

Shanxi Tai Steel Mo Bang furnace charge limited company has two submerged arc furnaces which are put into production respectively in 5 months in 2014 and 4 months in 2015, each submerged arc furnace is provided with three independent 35kV transformers, each transformer is respectively connected to two electrodes through two groups of short nets, each submerged arc furnace is provided with three electrodes, and the standard diameter of each electrode is 1800mm. The submerged arc furnace is a domestic introduced single ferrochrome smelting submerged arc furnace with the largest capacity, and the electrode diameter of the submerged arc furnace is also the largest in the domestic ferrochrome smelting submerged arc furnace.

During production, the two electrode cylinders are welded together through a 175mm wide wrapping tape, solid electrode paste is added into the electrode cylinders, the solid electrode paste is melted and sintered at a certain temperature through current heating, and the solid electrode with certain strength and good conductivity is obtained through roasting. The electrodes are continuously inserted downwards into the furnace, and the current is led into the furnace by the electrodes through the transformer to heat, melt and react the furnace charge, thereby completing the reduction of the chromite.

Because of the design of the electrode cylinder and the defect of roasting quality, the electrode is frequently turned around and broken, the normal production and operation are greatly disturbed, the electrode is found to have a crack phenomenon after entering a working end after being roasted through the comparison and analysis of the electrode turning around and broken conditions of the previous times, when the current density is overlarge, the electrode is influenced by thermal stress, is easy to crack, fall into blocks or even break from the crack, and the crack part is just the reinforcing rib part inside the electrode cylinder. The analysis of the structure of the site has the following problems: (1) rectangular holes are transversely arranged on the ribs distributed on the inner wall of the electrode cylinder in a circumferential manner; the transverse arrangement reduces the current density of the fins and the roasting speed of the electrode at the position. (2) The number of holes above the single sheet is small, and transverse ribs are arranged among the ribs. The number of the rectangular holes on the single sheet is small, and the existing transverse ribs are used, so that after the electrode is roasted, the original ribs are melted, and the electrode has longitudinal and transverse gaps with a large area, thereby providing an antecedent condition for cracking of the roasted electrode. (3) The corner of the rectangular hole is a right angle. A right-angle gap exists in the roasted electrode after the rib pieces are melted, the part becomes a stress concentration part, and when the stress changes, the part is easy to crack, the stress is released, and an electrode accident is formed. (4) The edge pressing depth of the end part of the electrode cylinder is not enough. In order to facilitate the welding of the two electrode cylinders, grooves with the depth of 4mm are formed in the two sides of each electrode cylinder, when the wrapping belt is installed, the welding line is protruded, little welding meat is left after the wrapping belt is polished to be flat, the electrode is easy to crack from the part during the roasting, the conductivity of the electrode cylinders is reduced, and the electrode roasting quality of the part is reduced. No matter the design of the electrode cylinder or the control of the daily electrode roasting parameters is realized, the unsuccessful experience can be followed, and independent exploration and improvement are required.

SUMMERY OF THE UTILITY MODEL

The utility model provides a promote hot stove electrode roasting quality's of ore deposit device through redesign, optimization according to technology characteristics to electrode barrel inner structure, eliminates structural defect, according to operating mode characteristics in the production process simultaneously, adjustment electrode calcination parameter, reinforcing electrode calcination intensity, production accidents such as progressively eliminating electrode turn around, fracture reduce electrode consumption, embody the advantage of the hot stove economic nature in large-scale ore deposit.

The utility model provides a device for improving the electrode roasting quality of a submerged arc furnace, which comprises an electrode cylinder, wherein rib plates are uniformly arranged on the inner wall of the electrode cylinder, holes are arranged on the rib plates in parallel from top to bottom, the holes are of an approximately rectangular structure, and the internal right-angle positions of the holes are in arc transition; the blank pressing depth of two ends of the electrode cylinder is 5mm; the electrode cylinder is connected with a transformer, and the current passing through the device is controlled by the transformer.

The electrode cylinder is a cylinder with the thickness of 4mm, the height of 1500mm and the diameter of 1800mm.

Furthermore, six holes are distributed on the single rib plate and are arranged longitudinally; the size of the hole is 60mm multiplied by 130mm; the pitch of the holes was 135mm.

Furthermore, the size of the rib plates is 340mm multiplied by 1705mm, and 16 rib plates are uniformly arranged in the electrode cylinder. The rib plate has the functions of improving the strength of the electrode cylinder on one hand, improving the current density on the other hand and accelerating the electrode roasting speed of the part. The rectangular holes are formed in each rib, the rib is adjusted to be of an approximately rectangular structure with smooth transition of inner angles, stress is reduced, and production accidents such as electrode turning and breakage are avoided.

In the device, the transformer connected with the electrode cylinder controls the roasting current passing through the device to be 1.5KA/h; the upper limit of the electrode current is 120KA.

The utility model provides a promote hot stove electrode calcination quality's in ore deposit device, the beneficial effect who brings:

(1) The manufacturing cost of the electrode cylinder does not need to be increased.

(2) The predicted economic benefit is as follows: the consumption of the electrode paste is reduced from the original 8.9kg/t to 7.5kg/t, the qualified ferrochrome quantity is 25000 tons produced every month, the price of the electrode paste per ton is 5000 yuan, and the direct benefit is 25000 multiplied by (8.9-7.5) ÷ 1000 multiplied by 5000 multiplied by 12=210 ten thousand yuan produced every year.

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

Drawings

Fig. 1 is a schematic view of the internal structure of the device of the present invention.

Fig. 2 is a top view of fig. 1.

In the figure, 1 is an electrode cylinder, 2 is a rib plate, and 3 is a hole.

Detailed Description

The embodiment is as follows:

the utility model provides a device of hot stove electrode calcination quality in promotion ore deposit has carried out redesign, optimization to electrode barrel inner structure. As shown in fig. 1 and 2, a device for improving the electrode roasting quality of a submerged arc furnace comprises an electrode barrel 1, rib plates 2 are uniformly arranged on the inner wall of the electrode barrel 1, holes 3 are arranged on the rib plates 2 in parallel from top to bottom, the holes are of an approximately rectangular structure, and the internal right angles of the holes are in arc transition; the blank pressing depth of two ends of the electrode cylinder is 5mm; the electrode cylinder is connected with a transformer, and the current passing through the device is controlled by the transformer.

The electrode cylinder 1 is a cylinder having a thickness of 4mm, a height of 1500mm and a diameter of 1800mm.

Furthermore, six holes 3 distributed on the single rib plate 2 are longitudinally arranged; as shown in fig. 1, the size of the holes is 60mm × 130mm; the pitch of the holes was 135mm.

Furthermore, the size of the rib plates is 340mm multiplied by 1705mm, and 16 rib plates are uniformly arranged in the electrode cylinder. As shown in fig. 2. The rib plate has the functions of improving the strength of the electrode cylinder on one hand, improving the current density on the other hand and accelerating the electrode roasting speed of the part. The rectangular holes are formed in each rib, the rib is adjusted to be of an approximately rectangular structure with smooth transition of inner angles, stress is reduced, and production accidents such as electrode turning and breakage are avoided.

Aiming at the problems existing in the structure, the electrode cylinder structure is redesigned and optimized through discussion, measurement and practice.

1. The rectangular holes on the ribs are adjusted to be longitudinally distributed.

2. The number of the square holes on the single sheet is adjusted to be 6, and the size is 60mm multiplied by 130mm; the transverse ribs between the ribs are removed.

3. The corners of the rectangular holes are improved from right angles to round angles. Reducing the stress.

4. The edge pressing depth at two ends of the electrode cylinder is adjusted from 4mm to 5mm.

The utility model discloses combine the change of electrode barrel structure, carry out adjustment, the optimization of pertinence to operating parameter.

1. The electrode roasting current is adjusted from 2KA/h to 1.5KA/h.

2. The upper limit of the electrode current is adjusted from 130KA to 120KA.

3. Adjustment and optimization of process control parameters

Effect verification

The upper table shows the comparison of the times of the electrode turning and the breakage accidents before and after the electrode barrel structure is improved and the process control parameters are optimized. It can be seen that the number of electrode failures is reduced from 1.5 per month to 4 months before improvement and only occurs for 1 time, which shows that the improvement and optimization have good effect on improving the electrode roasting quality, and further improvement and optimization are needed subsequently.

In the embodiment, through redesign of the electrode cylinder structure and adjustment and control of daily roasting parameters, the accidents of electrode breakage and turning around are reduced to 1 time in the test period, the times of the electrode accidents are greatly reduced, and the paste consumption per ton of iron electrode is reduced to 7.5kg/t, which is at the domestic leading level.

Claims

1. The utility model provides a promote hot stove electrode roasting quality's in ore deposit device which characterized in that: the electrode comprises an electrode barrel, rib plates are uniformly arranged on the inner wall of the electrode barrel, holes are arranged on the rib plates in parallel from top to bottom, the holes are of an approximately rectangular structure, and the inner right-angle positions of the holes are in arc transition; the blank pressing depth of two ends of the electrode cylinder is 5mm; the electrode cylinder is connected with a transformer, and the current passing through the device is controlled by the transformer.

2. The device for improving the electrode roasting quality of the submerged arc furnace as claimed in claim 1, wherein: six holes are distributed on the single rib plate and are longitudinally arranged; the size of the hole is 60mm multiplied by 130mm; the pitch of the holes was 135mm.

3. The apparatus for improving the electrode baking quality of the submerged arc furnace according to claim 1, wherein: the size of the rib plates is 340mm multiplied by 1705mm, and 16 rib plates are uniformly arranged in the electrode cylinder.

4. The apparatus for improving the electrode baking quality of the submerged arc furnace according to claim 1, wherein: the electrode cylinder is a cylinder with a thickness of 4mm, a height of 1500mm and a diameter of 1800mm.

5. The apparatus for improving the electrode baking quality of the submerged arc furnace according to claim 1, wherein: the transformer connected with the electrode cylinder controls the roasting current passing through the device to be 1.5kA/h; the upper limit of the electrode current is 120kA.