CN218642769U

CN218642769U - LF refining furnace scrap steel preheats in succession and feeding device

Info

Publication number: CN218642769U
Application number: CN202223165383.7U
Authority: CN
Inventors: 李聿军; 徐义红
Original assignee: Jiujiang University
Current assignee: Jiujiang University
Priority date: 2022-11-29
Filing date: 2022-11-29
Publication date: 2023-03-17
Anticipated expiration: 2032-11-29

Abstract

The utility model discloses a LF refining furnace steel scrap preheats and feeding device in succession, including the ladle furnace, the ladle furnace upper end is equipped with the water-cooled furnace lid, is equipped with the electrode that during operation one end was arranged in the ladle furnace on the water-cooled furnace lid, one side of water-cooled furnace lid is connected with the flue, is equipped with the one end in the flue and arranges the outside chain trigger of flue in, the chain trigger is located the outside one end top of flue and is equipped with the steel scrap feed bin, the top that is located the chain trigger on the flue is equipped with exhaust outlet. The utility model discloses can fully retrieve high temperature flue gas heat, realize that the steel scrap preheats in succession, reinforced and continuous melting in succession, increase steelmaking system's steel scrap addition, improve the yield of molten steel, reduce environmental pollution.

Description

LF refining furnace scrap steel preheats in succession and feeding device

Technical Field

The utility model relates to a LF refining furnace steel scrap preheats in succession and feeding device.

Background

At present, china generates about 2 million tons of iron and steel scrap every year. Under the background of carbon peak reaching and carbon neutralization, the utilization of scrap steel is regarded by the unprecedented importance of the country. The development program of the iron and steel industry clearly indicates that the iron ore proportion is gradually reduced and the specific gravity of the waste steel consumption is increased. At present, the recycling of the scrap steel is mainly carried out by an electric furnace and a converter, and the electric furnace and the converter develop scrap steel preheating technology to improve the consumption of the scrap steel. But the electric furnace and the converter smelting are both in oxidizing atmosphere, and the scrap steel is partially oxidized while being melted, so that the yield of the molten steel is greatly reduced.

The LF refining is a reducing atmosphere, the molten steel formed by adding the scrap steel is rarely oxidized, so that the yield is high, the consumption and the cost can be reduced, the temperature of high-temperature flue gas generated in the LF refining process can reach 1200-1600 ℃, and if the high-temperature flue gas can be used for preheating the scrap steel, the production cost can be further reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an LF refining furnace steel scrap preheats and feeding device in succession to solve the problem in the above-mentioned background art, the device can preheat in succession and add the steel scrap, has the characteristics that improve the yield of molten steel, reduction in production cost and energy-concerving and environment-protective.

The technical scheme includes that the continuous waste steel preheating and feeding device for the LF refining furnace comprises a ladle furnace, a water-cooled furnace cover is arranged at the upper end of the ladle furnace, an electrode is arranged in the ladle furnace when the water-cooled furnace cover works, one side of the water-cooled furnace cover is connected with a flue, a chain plate machine with one end arranged outside the flue is arranged in the flue, a waste steel bin is arranged above one end, located outside the flue, of the chain plate machine, and a waste gas outlet is formed in the flue and located above the chain plate machine.

Furthermore, a lifting hole is formed in the top of the water-cooled furnace cover, and the lower end of the electrode penetrates through the lifting hole to be placed in the ladle furnace during operation.

Further, one side of water-cooled furnace lid and the flue gas entry of flue are connected, and the flue gas entrance is equipped with sealed lid, it all is equipped with temperature transmitter to be located flue gas entry and exhaust gas outlet department respectively in the flue for measure the temperature of the high temperature flue gas of flue gas entrance and the exhaust gas temperature of exhaust gas outlet department.

Furthermore, a thermocouple is installed at one end, connected with the water-cooling furnace cover, of the flue on the chain plate machine.

Further, the scrap steel bin is at least one.

Advantageous effects

Compared with the prior art, the utility model has the following advantages.

The utility model discloses can make full use of the preheating of LF refining furnace high temperature flue gas, can realize preheating in succession and adding of scrap steel, the in-process that high temperature flue gas and scrap steel carry out the heat exchange, iron content oxide and lime dust etc. in the flue gas are adsorbed on the scrap steel, add in the LF refining furnace molten steel can further increase the molten steel volume and improve the desulfurization ability, reduce the flue gas and arrange outward and to the pollution of environment, it is few to have the scrap steel oxidation, the molten steel yield is high, energy-concerving and environment-protective advantage.

Drawings

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

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The present invention will be further described with reference to the following examples and accompanying drawings.

As shown in figure 1, the continuous steel scrap preheating and feeding device for the LF refining furnace comprises a ladle furnace 1, wherein a water-cooled furnace cover 2 is arranged at the upper end of the ladle furnace 1, an electrode 3 which is arranged in the ladle furnace 1 when one end of the water-cooled furnace cover 2 works is arranged on the water-cooled furnace cover 2, one side of the water-cooled furnace cover 2 is connected with a flue 4, a chain plate machine 5 with one end arranged outside the flue 4 is arranged in the flue 4, a steel scrap bin 6 is arranged above one end, which is positioned outside the flue 4, of the chain plate machine 5, and a waste gas outlet 41 is arranged above the chain plate machine 5 on the flue 4.

The top of the water-cooled furnace cover 2 is provided with a lifting hole 21, and the lower end of the electrode 3 passes through the lifting hole 21 and is arranged in the ladle furnace 1 during operation.

One side of water-cooling bell 2 is connected with flue gas entry 42 of flue 4, and flue gas entry 42 department is equipped with sealed lid, it all is equipped with temperature transmitter 7 to be located flue gas entry 42 and exhaust outlet 41 respectively in the flue 4 for measure the temperature of flue gas entry 42 department high temperature flue gas and the exhaust gas temperature of exhaust outlet 41 department.

And a thermocouple 8 is arranged at one end of the chain plate machine 5, which is positioned at the connection end of the flue 4 and the water-cooling furnace cover 2.

At least one scrap steel bin 6 is arranged.

The utility model discloses in, ladle furnace 1's upper end sets up the water-cooling bell 2 that is used for sealing the high temperature flue gas, circular shape lift hole 21 has been seted up to water-cooling bell 2 upper end, and electrode 3 of concise usefulness goes up and down through lift hole 21, the lateral part of water-cooling bell 2 is connected to flue 4, and flue 4 is inside to be equipped with chain trigger 5 is used for the transportation to follow the steel scrap that 6 feed bins of steel scrap joined.

The temperature transmitters 7 are respectively arranged at the flue gas inlet 42 and the waste gas outlet 41 of the flue 4 and are used for measuring the temperature of high-temperature flue gas at the flue gas inlet 42 and the temperature of waste gas at the waste gas outlet 41, and when the temperature of the waste gas at the waste gas outlet 41 is higher than 100 ℃ or lower than 50 ℃, the speed of the chain plate machine 5 or the adding amount of the waste steel in the waste steel bin 6 is adjusted.

And a thermocouple 8 is arranged on the chain plate machine 5 at the joint of the flue 4 and the water-cooled furnace cover 2 and is used for measuring the temperature of the preheated scrap steel added into the ladle furnace 1. After the temperature of the preheated scrap steel is set, when the difference between the actual preheated temperature of the scrap steel and the set preheated temperature is 30 ℃, the speed of the chain plate machine 5 or the scrap steel adding amount of the scrap steel bin 6 is adjusted, so that the preheated temperature meets the requirement.

The number of the scrap steel bins 6 is not less than 1, the size or the volume of the scrap steel bins 6 is matched with the ladle furnace 1, and the size of scrap steel in the bins of the scrap steel bins 6 is 20 to 120mm.

When not refined, the water-cooled furnace cover 2 and the electrode 3 are both in a lifting state. When refining begins, the water-cooling furnace cover 2 and the electrode 3 are lowered, the electrode 3 is electrified to begin refining, the water-cooling furnace cover 2 covers the ladle furnace 1 to seal the refining process so as to prevent high-temperature smoke generated in the refining process from overflowing to pollute the environment, meanwhile, a sealing cover at a smoke inlet 42 of the flue 4 is opened to connect the smoke inlet 42 with the side part of the water-cooling furnace cover 2, the high-temperature smoke enters the flue 4 to exchange heat with cold scrap steel on the chain plate machine 5, the movement speed of the chain plate machine 5 and the amount of the scrap steel added into the scrap steel bin 6 are adjusted, and the scrap steel is continuously added into molten steel after being preheated to 200-600 ℃ to be melted into molten steel. And when the refining is finished, stopping adding the scrap steel, closing a sealing cover at a flue gas inlet 42 on the flue 4, and lifting the water-cooled furnace cover 2 and the electrode 3. The operations are repeated in the next refining period, so that the continuous preheating and adding operations of the scrap steel in the refining process are realized.

The utility model discloses when concrete implementation, use the refined process that the continuous preheating of this set of device and add the steel scrap in refining process to explain for example of 150t ladle LF, wherein the steel scrap silo volume is 20m3.

The temperature of molten steel in a ladle is 1550 ℃, and the target preheating temperature of scrap steel is 500 ℃. After the ladle is opened into a refining station for temperature measurement, the water-cooled furnace cover 2 and the electrode 3 are sequentially lowered through the lifting device, the electrode 3 is electrified to start refining, meanwhile, the sealing cover on the flue 4 is opened, and the flue 4 is communicated with the water-cooled furnace cover 2. And opening a scrap steel bin 6, blanking according to 8kg/t of steel, and adding the scrap steel into the molten steel of the ladle furnace 1 at a certain speed through a chain plate machine 5. The generated high-temperature flue gas enters a flue 4, the temperature of the flue gas is 1530 ℃ measured by a temperature transmitter 7 arranged at a flue gas inlet 42 on the flue 4, the temperature of the waste steel positioned at the flue gas inlet 42 end on a thermocouple 8 measuring chain plate machine 5 is 550 ℃, and the temperature measured by the temperature transmitter 7 at a waste gas outlet 41 is 150 ℃. The temperature does not meet the requirement, the system enables the final addition of the scrap steel to be 10kg/t steel by adjusting the addition of the scrap steel in the scrap steel bin 6 and the running speed of the chain plate machine 5, the preheating temperature of the scrap steel is 496 ℃, and the temperature of the waste gas at the waste gas outlet 41 is 85 ℃, so that the target requirement is met.

And stopping adding the scrap steel 2 minutes before the refining is finished. And (3) closing a sealing cover at a flue gas inlet 42 on the flue 4 after refining is finished, and sequentially lifting the electrode 3 and the water-cooled furnace cover 2 through a lifting device to finish continuous preheating and feeding of the scrap steel. And (4) taking the refined molten steel out of the station and entering the next working procedure.

Claims

1. The utility model provides a continuous preheating of LF refining furnace steel scrap and feeding device, includes ladle furnace (1), its characterized in that, ladle furnace (1) upper end is equipped with water-cooled furnace lid (2), is equipped with electrode (3) that during operation one end was arranged in ladle furnace (1) on water-cooled furnace lid (2), one side of water-cooled furnace lid (2) is connected with flue (4), is equipped with one end in flue (4) and arranges flue (4) outside chain trigger (5) in, the one end top that chain trigger (5) are located flue (4) outside is equipped with scrap bin (6), the top that lies in chain trigger (5) on flue (4) is equipped with exhaust outlet (41).

2. The continuous preheating and feeding device of the LF refining furnace scrap steel according to claim 1, wherein the top of the water-cooled furnace cover (2) is provided with a lifting hole (21), and the lower end of the electrode (3) passes through the lifting hole (21) to be placed in the ladle furnace (1) during operation.

3. The continuous preheating and feeding device for the LF refining furnace scrap steel according to claim 1, wherein one side of the water-cooled furnace cover (2) is connected with a flue gas inlet (42) of a flue (4), a sealing cover is arranged at the flue gas inlet (42), and temperature transmitters (7) are respectively arranged at the flue gas inlet (42) and the waste gas outlet (41) in the flue (4) and used for measuring the temperature of the high-temperature flue gas at the flue gas inlet (42) and the temperature of the waste gas at the waste gas outlet (41).

4. The continuous preheating and feeding device of the LF refining furnace scrap steel as claimed in claim 1, wherein a thermocouple (8) is installed at one end of the chain plate machine (5) connected with the flue (4) and the water-cooling furnace cover (2).

5. The continuous preheating and feeding device of the LF refining furnace scrap steel according to claim 1, characterized in that the number of the scrap steel bins (6) is at least one.