CN-224199418-U - RH refining device for silicon steel production based on double vacuum pumps cooperated with direct-connection feeding system

Abstract

The utility model relates to the technical field of ferrous metallurgy RH vacuum refining, and particularly discloses an RH refining device for silicon steel production based on a double-vacuum pump cooperation and direct-connection feeding system, which mainly solves the problems of mismatch of RH processing period and continuous casting production rhythm of silicon steel production and alloy feeding efficiency bottleneck. According to the scheme, the second set of vacuum pump system is additionally arranged on the basis of the traditional three-vehicle five-position arrangement, so that two independent vacuumizing systems are formed, two treatment stations can be subjected to vacuum treatment at the same time, and the comprehensive treatment period of an RH link is reduced. Meanwhile, each station is provided with an independent ferrosilicon feeding system, and the ferrosilicon feeding system comprises a high-capacity high-level stock bin, a weighing hopper and a vacuum charging bucket which are directly connected with a chute, so that ferrosilicon feeding time is shortened. The utility model synergistically optimizes the vacuum treatment efficiency and the charging flow of the three-car five-position RH vacuum refining device, and realizes the efficient matching of the RH refining period and the continuous casting rhythm during the silicon steel production.

Inventors

• SHI CAIXIA

Assignees

• 中冶赛迪工程技术股份有限公司

Dates

Publication Date

20260505

Application Date

20250506

Claims (9)

1. 1. RH refining device towards silicon steel production based on two vacuum pumps are cooperateed and direct connection charging system, its characterized in that includes: The RH refining device is based on the arrangement mode of the existing three-car five-position RH refining device, is provided with two processing stations and three standby stations, and comprises three vacuum groove traversing trolleys, wherein the three vacuum groove traversing trolleys are used in a switching mode between the two processing stations and the three standby stations; the vacuumizing system is respectively and independently arranged corresponding to the two processing stations and is used for realizing the simultaneous vacuum processing of the two processing stations; the feeding system is characterized in that an independent ferrosilicon feeding system is arranged for each processing station, and a weighing hopper and a vacuum charging tank of the ferrosilicon feeding system are directly connected in a feeding mode through a chute.
2. 2. The device of claim 1, wherein the RH refining device is provided with a second set of vacuum pump stations in the existing three-vehicle five-position RH refining device process arrangement framework, two independent vacuum systems are constructed, and the vacuum pump is in the form of a mechanical pump or a steam pump.
3. 3. The apparatus of claim 2, wherein the two independent vacuum systems have substantially the same vacuum capacity and equipment composition.
4. 4. The device of any one of claims 1-3, wherein the RH refining device realizes parallel operation of two processing stations through intelligent scheduling and distribution, and the vacuum degree of each processing station system is independently regulated and controlled.
5. 5. The device of claim 1, wherein the two processing stations of the three-car five-position RH vacuum refining device are respectively and independently provided with 1 group of ferrosilicon feeding systems, each group of ferrosilicon feeding systems consists of a high-capacity ferrosilicon storage bin, a ferrosilicon weighing hopper and a ferrosilicon vacuum charging tank, and the equipment compositions and the equipment parameters of the ferrosilicon feeding systems of the two processing stations are the same.
6. 6. The device according to claim 1 or 5, wherein the number of the high-level ferrosilicon bins of each group is more than or equal to 2, and the total volume of the ferrosilicon bins of each group meets the production requirement of a single station for 24 hours.
7. 7. The device of claim 5, wherein the ferrosilicon weighing hoppers are positioned below the ferrosilicon high-level bins, and the ferrosilicon weighing hoppers of each treatment station are configured such that two ferrosilicon high-level bins correspond to one ferrosilicon weighing hopper or four ferrosilicon high-level bins correspond to one ferrosilicon weighing hopper, and the capacity of the ferrosilicon weighing hoppers meets the requirement of the adding amount of ferrosilicon in single-furnace molten steel.
8. 8. The device of claim 5, wherein the ferrosilicon vacuum tank is positioned below the ferrosilicon weighing hopper and is directly connected with the ferrosilicon weighing hopper through a chute.
9. 9. The device of claim 8, wherein the volume of the ferrosilicon vacuum tank meets the requirement of the adding amount of ferrosilicon in single-furnace molten steel.

Description

RH refining device for silicon steel production based on double vacuum pumps cooperated with direct-connection feeding system Technical Field The utility model belongs to the technical field of RH vacuum refining devices, and relates to an RH refining device for silicon steel production based on a double-vacuum pump cooperation and direct connection feeding system. Background Silicon steel, especially high grade silicon steel, has the characteristics of long charging time, long vacuum treatment period and the like in RH vacuum refining link due to the characteristics of low carbon, low sulfur, large alloy charging amount and the like. And in the RH vacuum refining link, the single-furnace pure vacuum treatment time of the high-grade silicon steel is more than 45min. For the three-car five-position RH vacuum refining device, even if the crane hangs a ladle on a ladle car, the time consumption of non-vacuum treatment such as ladle car running and the like can not be counted into the RH comprehensive period, the RH vacuum refining period is difficult to match with the casting period of continuous casting due to longer pure vacuum treatment time, the number of continuous casting furnaces is further influenced, and the difficulty of production scheduling is increased. The problem of mismatch between RH processing period and continuous casting production rhythm in silicon steel production is particularly obvious in converter steelworks under the level of 250 t. Taking a 180t converter as an example, a 1880mm slab caster is arranged for continuous casting, the average continuous casting period of silicon steel production is less than 38min, for common grade silicon steel, the RH single-furnace pure vacuum treatment period is more than 40min, for high grade silicon steel, the RH single-furnace pure vacuum treatment period is more than 45min, the RH vacuum refining period is more than the continuous casting period, and the RH vacuum refining device treatment period and the continuous casting period are difficult to match. In addition, the alloy addition amount, especially the ferrosilicon addition amount, of the silicon steel production in the RH vacuum refining device is larger. Still taking a 180t converter as an example, the non-oriented silicon steel containing 3.5% of silicon is produced, and the addition amount of the ferrosilicon is about 8.7t. The conventional three-car five-position RH vacuum refining device has a common feeding system for two processing stations, and the ferrosilicon feeding process comprises the steps of discharging ferrosilicon from a high-position feed bin to a weighing hopper, weighing the weighing hopper, discharging ferrosilicon onto a summarizing tape machine through a vibrating feeder, and adding ferrosilicon into a ferrosilicon vacuum material tank through a chute by using a tape machine. The time required from the beginning of discharging of the weighing hopper to the time required by the summarizing tape machine to discharge all ferrosilicon into the ferrosilicon vacuum charging bucket is more than 3.5min. The transfer time of the alloy is longer only for ferrosilicon, and the production of silicon steel also needs to add unequal amounts of alloys such as aluminum, ferromanganese and the like according to different grades. The method has the advantages that the alloy addition amount is large, the alloy variety is large, the RH vacuum treatment period is greatly prolonged by the addition operation, and the matching relation between RH vacuum refining and continuous casting is deteriorated. In order to solve the defects of the prior art, a new RH process arrangement is provided, the vacuum treatment period of a three-car five-position RH refining device is shortened, and the problems of mismatch of the RH treatment period of silicon steel production and continuous casting production rhythm and alloy feeding efficiency bottleneck are solved. Disclosure of utility model Based on the existing three-car five-position RH vacuum refining device, the utility model provides an RH vacuum refining device process arrangement optimization scheme capable of realizing double-station parallel vacuum processing and optimizing ferrosilicon charging flow simultaneously, so as to solve the problems of mismatch with continuous casting production rhythm and alloy charging efficiency bottleneck, and meet the requirements of high-efficiency and stable production of silicon steel. In order to achieve the above purpose, the present utility model provides the following technical solutions: RH refining device towards silicon steel production based on two vacuum pumps are cooperateed and direct connection charging system includes: The RH refining device is based on the arrangement mode of the existing three-car five-position RH refining device, is provided with two processing stations and three standby stations, and comprises three vacuum tank traversing trolleys, wherein the three vacuum tank trolleys can b