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CN-116949237-B - Converter production method for recycling dust by online adding converter

CN116949237BCN 116949237 BCN116949237 BCN 116949237BCN-116949237-B

Abstract

The invention relates to a converter production method for recycling dust by online adding into a converter, and belongs to the technical field of smelting of carbon steel by converter dust. The method combines two modes of directly adding the recovered dust into the converter on line and directly adding the recovered dust into the converter indirectly after reprocessing the recovered dust off line, and simultaneously uses the two modes in the production flow of the converter, and provides specific adding conditions and steps of the two modes of adding the converter dust, so that the method can guide and realize the online real-time return of the recovered dust into the converter, and can be better suitable for the actual production of the converter.

Inventors

  • GUO HAIBIN
  • RAO GANG
  • GONG CHANGJUN

Assignees

  • 上海梅山钢铁股份有限公司

Dates

Publication Date
20260505
Application Date
20220414

Claims (5)

  1. 1. The converter production method for online adding the recovered dust of the converter is characterized in that the converter is provided with a dry dedusting device and an ash storage bin for storing the recovered dust of the dry dedusting device in a matching way, and an ash adding bin for directly storing the dust and having a first volume weight V1 and a high-level bin for adding auxiliary materials for the converter are arranged above the converter; In the process of executing the converter production flow, when the production plan determines that the dust is to be added into the current converter, determining a second capacity V2 of the dust to be added into the current converter production flow according to the production plan, wherein the converter production flow respectively comprises a first charging step of adding scrap steel into the converter before oxygen blowing and adding molten iron and a second charging step of adding auxiliary materials into the converter when oxygen blowing, and the method is characterized in that the following steps are additionally executed in the converter production flow: 1) After the production flow of the converter is started, Metering a third capacity weight V3 of the dust recovered by the dry dedusting equipment in the previous converter production flow, and metering a fourth capacity weight V4 of the residual dust in the dust adding bin; The second capacity weight V2 is smaller than or equal to the first capacity weight V1 and larger than or equal to the third capacity weight V3; when v3+v4< V1, performing the next step; when V3+V4 is more than or equal to V1 or the dry dedusting equipment fails, executing the step 3); 2) Before the first feeding step, the dust recovered by the dry dedusting equipment is input into the ash adding bin, and then the dust with a first capacity weight V is added into the converter through the ash adding bin; 3) Firstly, conveying the recovered dust of the dry dedusting equipment into the ash storage bin, and then, making the dust in the ash storage bin into spheres; 4) In a second charging step, the dust produced in the form of spheres is charged into the converter together with the auxiliary material.
  2. 2. A converter production process with online addition of converter recovery dust as claimed in claim 1, characterized in that in step 2), If the second capacity V2 is smaller than the sum of the third capacity V3 and the fourth capacity V4, adding dust into the converter in a batch; If the second capacity V2 is larger than the sum of the third capacity weight V3 and the fourth capacity weight V4 and smaller than twice the sum of the third capacity weight V3 and the fourth capacity weight V4, adding dust into the converter in two batches at intervals of 25-35 seconds; If the second capacity V2 is greater than twice the sum of the third and fourth capacity V3, V4, dust is fed into the converter in three batches with an interval of 25-35 seconds.
  3. 3. The method for producing the converter with the online recycled dust of the converter as claimed in claim 1, wherein the rotation speed of the primary dust removing fan of the dry dust removing device is controlled according to the following conditions: A. When the converter production process begins, controlling the rotating speed of the primary dust removal fan to be 15-20% of the rated rotating speed; B. when the dust is added before the first feeding step, controlling the rotating speed of the primary dust removing fan to be 21-25% of the rated rotating speed; C. When scrap steel is added in the first feeding step, controlling the rotating speed of the primary dust removal fan to be 21-25% of the rated rotating speed; D. when molten iron is added in the first feeding step, the rotating speed of the primary dust removal fan is controlled to be 75-80% of the rated rotating speed; E. in the second feeding step, the rotating speed of the primary dust removing fan is controlled to be 100% of the rated rotating speed.
  4. 4. The converter production method for online addition of converter recovered dust according to claim 1, wherein the opening degree of the secondary dedusting valve of the dry dedusting equipment is controlled according to the following conditions: A. when the converter production flow starts, controlling the opening of the secondary dedusting valve to be 15-20% of the maximum opening; B. When the dust is added before the first feeding step, controlling the opening of the secondary dust removal valve to be 21-25% of the maximum opening of the secondary dust removal valve; C. When scrap steel is added in the first feeding step, controlling the opening of the secondary dust removal valve to be 75-80% of the maximum opening of the secondary dust removal valve; D. Controlling the opening of the secondary dedusting valve to be 81-85% of the maximum opening of the secondary dedusting valve when molten iron is added in the first feeding step; E. In the second feeding step, the opening degree of the secondary dust removing valve is controlled to be 100% of the maximum opening degree of the secondary dust removing valve.
  5. 5. The method for producing a converter with online addition of recovered dust from a converter according to claim 1, wherein in the step 3), the dust in the dust storage bin is discharged and then sent out to a special dust reprocessing workshop to make the dust into a ball shape, and then the dust in the ball shape is sent back to a high-level bin of the converter.

Description

Converter production method for recycling dust by online adding converter Technical Field The invention relates to a production method for adding dust recovered by dry dedusting equipment in converter production into a converter on line, belonging to the technical field of smelting of carbon steel by using converter smoke dust. Background In the existing converter production flow, various dust generated in the converter production flow is recovered through the arranged dry dedusting equipment, and the method is also called converter dry dedusting. Since the dust recovered by the dry dedusting of the converter generally contains a large amount of iron and ferric oxide, the dust recovered by the dry dedusting of the converter is returned to the converter production, so that the production cost of converter smelting can be reduced. The existing method for returning the dust recovered by the dry dedusting of the converter to the production of the converter is that the dust recovered by the dry dedusting equipment is firstly input into a dust storage bin, then the dust is transported to a special dust reprocessing workshop through a transport vehicle, and the dust is cold-pressed into spheres through special equipment. The spherical dust balls are conveyed to a rotary furnace production workshop through a vehicle, and are added into a high-level bin of the converter for adding various auxiliary materials (slag forming agents and the like) through a feeding device. In the subsequent converter production flow, the dust balls are added into the converter through equipment such as a valve, a vibration feeder and the like, so that the dust is effectively recycled and utilized. There are also known devices for directly feeding the dust recovered from the converter back into the converter, such as a converter smelting system and a converter coarse ash feeding device disclosed in chinese patent publication No. CN207828341U and a converter flue gas dust recovery device disclosed in chinese patent publication No. CN 207862382U. However, these publications only give a rough set of devices and simple concepts for returning the dust recovered from the converter to the converter, and do not propose any specific method for adapting to the different process requirements of the actual production process of the converter. Thus, there is no practical guidance on how the dust recovered by the converter can be used in the converter production process. Disclosure of Invention The technical problem to be solved by the invention is to provide a specific process method which can adapt to the process requirements in the actual converter production flow. The technical scheme provided by the invention for solving the technical problems is that the converter production method for online feeding in converter recovered dust is characterized in that a dry dedusting device and an ash storage bin for storing the dust recovered by the dry dedusting device are arranged in a matched manner in the converter, and an ash feeding bin which is used for directly storing the dust and has a first capacity weight V1 is arranged above the converter; In the process of executing the converter production flow, when the production plan determines that the dust is to be added into the current converter, determining a second capacity V2 of the dust to be added into the current converter production flow according to the production plan, wherein the converter production flow respectively comprises a first charging step of adding scrap steel and molten iron into the converter before oxygen blowing and a second charging step of adding various auxiliary materials into the converter when oxygen blowing; The following steps are additionally executed in the converter production flow: 1) After the production flow of the converter is started, Metering a third capacity weight V3 of the dust recovered by the dry dedusting equipment in the previous converter production flow, and metering a fourth capacity weight V4 of the residual dust in the dust adding bin; The second capacity weight V2 is smaller than or equal to the first capacity weight V1 and larger than or equal to the third capacity weight V3; when v3+v4< V1, performing the next step; when V3+V4 is more than or equal to V1 or the dry dedusting equipment fails, executing the step 3); 2) Before the first feeding step, the dust recovered by the dry dedusting equipment is input into the ash adding bin, and then the dust with a first capacity weight V is added into the converter through the ash adding bin; 3) Firstly, conveying the recovered dust of the dry dedusting equipment into the ash storage bin, and then, making the dust in the ash storage bin into spheres; 4) In a second charging step, the dust produced in the form of spheres is charged into the converter together with the auxiliary material. Further, in the step 2), If the second capacity V2 is smaller than the sum of the third capacity V3 and the fourth capacity V