Waste steel charging and distributing method for continuous waste steel preheating electric furnace

Abstract

The invention relates to a steel scrap charging and distributing method for a continuous steel scrap preheating electric furnace, and belongs to the technical field of steel smelting methods. According to the technical scheme, the method comprises the steps that a Consteel electric arc furnace scrap steel feeding movement distance model is established according to the movement distance of a belt; the Consteel section is divided into a feeding channel, a conveying channel and a preheating channel; heavy waste steel and medium-sized waste steel are arranged in the charging channel part section, and it is guaranteed that the waste steel loaded with the heavy waste steel and medium-sized waste steel sections accurately stays in a preheating channel; and medium-sized scrap steel and crushed materials are arranged at other positions of the feeding channel. The method has the beneficial effects that the proportion of waste steel staying in the waste steel preheating section to preheat the next furnace is increased by optimizing material distribution, and the purpose of reducing energy consumption is achieved; by adopting the steel scrap feeding movement distance model, the movement condition of the steel scrap can be more accurately controlled, the preheating effect of the steel scrap is quantitatively optimized, heat of high-temperature flue gas is fully utilized to preheat the steel scrap, and the preheating temperature of the steel scrap is further increased.

Description

Technical Field

[0001] This invention relates to a method for charging and distributing scrap steel in a continuous scrap steel preheating electric furnace, belonging to the technical field of iron and steel smelting methods. Background Technology

[0002] Electric arc furnace steelmaking is one of the world's major steelmaking methods. Using scrap steel as the main raw material, it features a short process, low energy consumption and low carbon emissions. It can provide steel materials needed for key equipment and components in important fields such as energy, transportation, machinery manufacturing, and national defense, and has broad development prospects.

[0003] Electricity consumption constitutes the largest portion of the production cost in electric arc furnace steelmaking. This cost is particularly pronounced in my country due to power shortages. In contrast, the horizontal continuous charging electric arc furnace features a fully enclosed furnace lid throughout the entire smelting process. The high-temperature flue gas generated by the furnace exchanges heat with the scrap steel through a horizontal charging system, increasing the scrap steel's entry temperature and reducing electricity consumption per ton of steel by 20-100 kWh / t. Therefore, the horizontal continuous charging electric arc furnace offers advantages such as energy saving, reduced consumption, and shorter production cycles, leading to its rapid development in recent years.

[0004] However, in actual production, due to unreasonable scrap steel feeding and inaccurate calculation of belt movement distance, the scrap steel remaining in the preheating channel is not heavy scrap steel with good heat storage performance, and cannot make full use of high-temperature flue gas. Therefore, it is necessary to increase the power input in the subsequent smelting process, resulting in long smelting cycle, high electrode consumption and high smelting power consumption. Summary of the Invention

[0005] The purpose of this invention is to provide a method for charging and distributing scrap in a continuous scrap preheating electric arc furnace. By optimizing the distribution, the proportion of scrap remaining in the preheating section for the next heat is increased, thereby reducing energy consumption. By adopting a scrap feeding movement distance model, the movement of the scrap can be controlled more precisely, the preheating effect of the scrap can be quantitatively optimized, and the heat of high-temperature flue gas can be fully utilized to preheat the scrap, further increasing the preheating temperature of the scrap and effectively solving the above-mentioned problems in the background technology.

[0006] The technical solution of this invention is: a method for charging and distributing scrap steel in a continuous scrap steel preheating electric furnace, comprising the following steps: (1) Based on the distance of belt movement, establish a model of the movement distance of scrap steel feeding in Consteel electric arc furnace, and calculate the movement distance in real time based on the running speed of the belt; (2) Based on the motion distance model, the Consteel section is divided into three parts, including the feeding channel, the transport channel and the preheating channel; (3) During the scrap steel feeding process, heavy scrap steel and medium scrap steel are arranged in sections of the feeding channel. According to the movement distance model, the scrap steel carrying heavy scrap steel and medium scrap steel is kept in the preheating channel, while controlling the proportion of scrap steel in the total amount added. (4) Medium scrap steel and crushed material are arranged in the remaining positions of the feeding channel.

[0007] In step (2), the feeding channel is 45m long, the transport channel is 20m long, and the preheating channel is 25m long.

[0008] In step (3), during the scrap steel feeding process, the total distance of the belt movement is 120-140m. When the belt movement distance is 30-50m, heavy scrap steel and medium scrap steel are arranged in the feeding channel, with a cloth length of 25m. The scrap steel accounts for 25%-35% of the total amount added.

[0009] In step (3), heavy scrap steel and medium scrap steel are arranged in sections in the feeding channel, with medium scrap steel at the bottom and heavy scrap steel at the top.

[0010] In step (4), medium scrap steel and crushed material are arranged in the remaining positions of the feeding channel, with crushed material at the bottom and medium scrap steel at the top.

[0011] The beneficial effects of this invention are: by optimizing the material distribution, the proportion of scrap steel remaining in the scrap steel preheating section for the next heat preheating is increased, thereby reducing energy consumption; by adopting a scrap steel feeding movement distance model, the movement of scrap steel can be controlled more precisely, the preheating effect of scrap steel can be quantitatively optimized, the heat of high-temperature flue gas can be fully utilized to preheat scrap steel, and the preheating temperature of scrap steel can be further increased. Attached Figure Description

[0012] Appendix Figure 1 This is a schematic diagram of the continuous scrap preheating electric furnace scrap charging according to an embodiment of the present invention; In the diagram: feeding channel 1, transport channel 2, preheating channel 3. Detailed Implementation

[0013] To make the purpose, technical solutions, and advantages of the embodiments of the invention clearer, the technical solutions in the embodiments of the invention will be clearly and completely described below. Obviously, the embodiments described are only a small part of the embodiments of the invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without creative effort are within the protection scope of the invention.

[0014] A method for charging and distributing scrap in a continuous scrap preheating electric furnace includes the following steps: (1) Based on the distance of belt movement, establish a model of the movement distance of scrap steel feeding in Consteel electric arc furnace, and calculate the movement distance in real time based on the running speed of the belt; (2) Based on the motion distance model, the Consteel section is divided into three parts, including the feeding channel, the transport channel and the preheating channel; (3) During the scrap steel feeding process, heavy scrap steel and medium scrap steel are arranged in sections of the feeding channel. According to the movement distance model, the scrap steel carrying heavy scrap steel and medium scrap steel is kept in the preheating channel, while controlling the proportion of scrap steel in the total amount added. (4) Medium scrap steel and crushed material are arranged in the remaining positions of the feeding channel.

[0015] In step (2), the feeding channel is 45m long, the transport channel is 20m long, and the preheating channel is 25m long.

[0016] In step (3), during the scrap steel feeding process, the total distance of the belt movement is 120-140m. When the belt movement distance is 30-50m, heavy scrap steel and medium scrap steel are arranged in the feeding channel, with a cloth length of 25m. The scrap steel accounts for 25%-35% of the total amount added.

[0017] In step (3), heavy scrap steel and medium scrap steel are arranged in sections in the feeding channel, with medium scrap steel at the bottom and heavy scrap steel at the top.

[0018] In step (4), medium scrap steel and crushed material are arranged in the remaining positions of the feeding channel, with crushed material at the bottom and medium scrap steel at the top. Example 1

[0019] First, a model of the scrap steel feeding distance in the Consteel electric arc furnace is established based on the distance traveled by the belt conveyor.

[0020] Based on the motion distance model, the Consteel section is divided into three parts, including the feeding channel, the transport channel, and the preheating channel. The feeding channel is 45m long, the transport channel is 20m long, and the preheating channel is 25m long.

[0021] The furnace is expected to require 150 tons of scrap steel. During the scrap steel feeding stage, the total distance of the conveyor belt movement is specified to be 140 meters. When the conveyor belt movement distance is 50 meters, heavy scrap steel and medium scrap steel are then arranged in the feeding channel. Medium scrap steel is arranged at the bottom and heavy scrap steel is arranged at the top, with a laying length of 25 meters. Among them, the amount of medium scrap steel is 30 tons and the amount of heavy scrap steel is 20 tons, accounting for 33.3% of the total scrap steel added. Medium scrap steel and crushed material are arranged in the remaining positions, with crushed material at the bottom and medium scrap steel at the top, for a total of 100 tons.

[0022] From the moment the heavy and medium scrap steel sections are laid out, the conveyor belt will move for another 90m and then stop, thus accurately stopping the scrap steel carrying the heavy and medium scrap steel sections in the preheating channel. Example 2

[0023] First, a model of the scrap steel feeding distance in the Consteel electric arc furnace is established based on the distance traveled by the belt conveyor.

[0024] Based on the motion distance model, the Consteel section is divided into three parts, including the feeding channel, the transport channel, and the preheating channel. The feeding channel is 45m long, the transport channel is 20m long, and the preheating channel is 25m long.

[0025] The furnace is expected to require 160 tons of scrap steel. During the scrap steel feeding stage, the total distance of the conveyor belt movement is specified to be 145 meters. When the conveyor belt movement distance is 55 meters, heavy scrap steel and medium scrap steel are then arranged in the feeding channel. Medium scrap steel is arranged at the bottom and heavy scrap steel is arranged at the top, with a laying length of 25 meters. Among them, the amount of medium scrap steel is 28 tons and the amount of heavy scrap steel is 18 tons, accounting for 28.75% of the total scrap steel added. Medium scrap steel and crushed material are arranged in the remaining positions, with crushed material at the bottom and medium scrap steel at the top, totaling 114 tons.

[0026] From the moment the heavy and medium scrap steel sections are laid out, the conveyor belt will move for another 90m and then stop, thus accurately stopping the scrap steel carrying the heavy and medium scrap steel sections in the preheating channel. Example 3

[0027] First, a model of the scrap steel feeding distance in the Consteel electric arc furnace is established based on the distance traveled by the belt conveyor.

[0028] Based on the motion distance model, the Consteel section is divided into three parts, including the feeding channel, the transport channel, and the preheating channel. The feeding channel is 45m long, the transport channel is 20m long, and the preheating channel is 25m long.

[0029] The furnace is expected to require 140 tons of scrap steel. During the scrap steel feeding stage, the total distance of the conveyor belt movement is specified to be 120 meters. When the conveyor belt movement distance is 30 meters, heavy scrap steel and medium scrap steel are then arranged in the feeding channel. Medium scrap steel is arranged at the bottom and heavy scrap steel is arranged at the top, with a laying length of 25 meters. Among them, the amount of medium scrap steel is 28 tons and the amount of heavy scrap steel is 20 tons, accounting for 34.28% of the total scrap steel added. Medium scrap steel and crushed material are arranged in the remaining positions, with crushed material at the bottom and medium scrap steel at the top, totaling 92 tons.

[0030] From the moment the heavy and medium scrap steel sections are laid out, the conveyor belt will move for another 90m and then stop, thus accurately stopping the scrap steel carrying the heavy and medium scrap steel sections in the preheating channel. Example 4

[0031] First, a model of the scrap steel feeding distance in the Consteel electric arc furnace is established based on the distance traveled by the belt conveyor.

[0032] Based on the motion distance model, the Consteel section is divided into three parts, including the feeding channel, the transport channel, and the preheating channel. The feeding channel is 45m long, the transport channel is 20m long, and the preheating channel is 25m long.

[0033] The estimated amount of scrap steel required for this furnace is 145 tons. During the scrap steel feeding stage, the total distance of the conveyor belt movement is specified to be 122 meters. When the conveyor belt movement distance is 32 meters, heavy scrap steel and medium scrap steel are then arranged in the feeding channel. Medium scrap steel is arranged at the bottom and heavy scrap steel is arranged at the top, with a laying length of 25 meters. Among them, the amount of medium scrap steel is 25 tons and the amount of heavy scrap steel is 20 tons, accounting for 31.03% of the total scrap steel added. Medium scrap steel and crushed material are arranged in the remaining positions, with crushed material at the bottom and medium scrap steel at the top, totaling 100 tons.

[0034] From the moment the heavy and medium scrap steel sections are laid out, the conveyor belt will move for another 90m and then stop, thus accurately stopping the scrap steel carrying the heavy and medium scrap steel sections in the preheating channel. Example 5

[0035] First, a model of the scrap steel feeding distance in the Consteel electric arc furnace is established based on the distance traveled by the belt conveyor.

[0036] Based on the motion distance model, the Consteel section is divided into three parts, including the feeding channel, the transport channel, and the preheating channel. The feeding channel is 45m long, the transport channel is 20m long, and the preheating channel is 25m long.

[0037] The estimated amount of scrap steel required for this furnace is 152 tons. During the scrap steel feeding stage, the total distance of the conveyor belt movement is specified to be 130 meters. When the conveyor belt movement distance is 40 meters, heavy scrap steel and medium scrap steel are then arranged in the feeding channel. Medium scrap steel is arranged at the bottom and heavy scrap steel is arranged at the top, with a laying length of 25 meters. Among them, the amount of medium scrap steel is 28 tons and the amount of heavy scrap steel is 19 tons, accounting for 30.92% of the total scrap steel added. Medium scrap steel and crushed material are arranged in the remaining positions, with crushed material at the bottom and medium scrap steel at the top, totaling 105 tons.

[0038] From the moment the heavy and medium scrap steel sections are laid out, the conveyor belt will move for another 90m and then stop, thus accurately stopping the scrap steel carrying the heavy and medium scrap steel sections in the preheating channel.

[0039] By applying this invention, the preheating temperature of scrap steel is further increased, making full use of the heat of high-temperature flue gas to preheat the scrap steel. By optimizing the material distribution, the proportion of scrap steel remaining in the scrap steel preheating section for the next furnace preheating is increased, thereby achieving the goal of reducing energy consumption.

[0040] By using a scrap steel feeding distance model, the movement of scrap steel can be controlled more precisely, and the preheating effect of scrap steel can be quantitatively optimized.

Claims

1. A method for charging and distributing scrap in a continuous scrap preheating electric furnace, characterized in that... Includes the following steps: (1) Based on the distance of belt movement, establish a model of the movement distance of scrap steel feeding in Consteel electric arc furnace, and calculate the movement distance in real time based on the running speed of the belt; (2) Based on the motion distance model, the Consteel section is divided into three parts, including the feeding channel, the transport channel and the preheating channel; (3) During the scrap steel feeding process, heavy scrap steel and medium scrap steel are arranged in sections of the feeding channel. According to the movement distance model, the scrap steel carrying heavy scrap steel and medium scrap steel is kept in the preheating channel, while controlling the proportion of scrap steel in the total amount added. (4) Medium scrap steel and crushed material are arranged in the remaining positions of the feeding channel.

2. The method for charging and distributing scrap in a continuous scrap preheating electric furnace according to claim 1, characterized in that: In step (2), the feeding channel is 45m long, the transport channel is 20m long, and the preheating channel is 25m long.

3. The method for charging and distributing scrap in a continuous scrap preheating electric furnace according to claim 2, characterized in that: In step (3), during the scrap steel feeding process, the total distance of the belt movement is 120-140m. When the belt movement distance is 30-50m, heavy scrap steel and medium scrap steel are arranged in the feeding channel, with a cloth length of 25m. The scrap steel accounts for 25%-35% of the total amount added.

4. The method for charging and distributing scrap in a continuous scrap preheating electric furnace according to claim 1, characterized in that: In step (3), heavy scrap steel and medium scrap steel are arranged in sections in the feeding channel, with medium scrap steel at the bottom and heavy scrap steel at the top.

5. The method for charging and distributing scrap in a continuous scrap preheating electric furnace according to claim 1, characterized in that: In step (4), medium scrap steel and crushed material are arranged in the remaining positions of the feeding channel, with crushed material at the bottom and medium scrap steel at the top.

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