A method of simulating the position of a charge drop in a blast furnace during distribution of the charge

Abstract

This invention discloses a method for simulating the landing position of blast furnace charge during charging, comprising: assembling an iron drawer box on the furnace top platform, the length of which is assembled according to the radius of the blast furnace throat; after multiple drawers are firmly assembled, installing and illuminating a laser pointer; threading steel wire ropes through the front and rear drawers, the steel wire ropes passing through fixed pulleys above the large cover, and finally fixing the two sets of steel wire ropes to two sets of winches respectively; after the blast furnace top cover and manhole are opened, lowering the charge distribution measuring device to the blast furnace charge surface through the top cover, and adjusting the position of the charge distribution measuring device by tightening and loosening the steel wire ropes using the winches; after the charge is distributed, the two sets of steel wire ropes work together to move the charge distribution detection device to the furnace top platform. The purpose of this invention is to provide a method for accurately locating the landing position of the charge, measuring the width of the charge flow, and quantifying the weight distribution of the charge in different areas during blast furnace shutdown.

Description

Technical Field

[0001] This invention belongs to the field of blast furnace ironmaking technology in the iron and steel industry, and particularly relates to a method for simulating the landing position of the furnace charge during blast furnace charging. Background Technology

[0002] The stable and smooth operation of a blast furnace relies on a reasonable charging system, which is implemented through the tilting of the charging chute. As the core component of the blast furnace top charging system, the charging chute's operating state directly determines the distribution of the burden within the furnace, playing a crucial role in the distribution of the blocky gas flow, fuel consumption, and smooth operation of the blast furnace. In blast furnace ironmaking, a reasonable burden distribution can optimize the secondary and tertiary gas flow distribution, adjust the degree of indirect reduction reaction, increase the proportion of indirect reduction reaction by adjusting the charging system, and reduce direct reduction, thereby lowering the coke ratio. In terms of gas flow adjustment, by regulating the position and weight of ore and coke, excessive local burden concentration or the formation of empty burden zones can be avoided, preventing furnace wall thickening, pipe flow problems, and other malfunctions. These are prerequisites for achieving efficient, stable, and low-carbon operation of the blast furnace.

[0003] The working principle of the charging chute is based on a charging mechanism composed of rotation and tilting, which is accomplished by two independent actions driven by a transmission mechanism. The charging chute rotates around the centerline of the blast furnace. During the actual charging process, the tilting angle is adjusted according to the process settings to slide coke, sinter, pellets, and other furnace materials out of the chute and scatter them to different radius areas of the furnace throat. By setting different chute tilt angles, rotation speeds, and batching systems, various charging modes such as annular charging, fixed-point charging, and fan-shaped charging can be achieved, thereby meeting the needs of furnace condition regulation. At the same time, it can guide and regulate the distribution of the gas flow during its ascent, making full use of the heat exchange and chemical reactions of the gas flow.

[0004] If the angle of the charging chute is inaccurate, it will cause a deviation between the actual and expected charge level in the furnace, resulting in chaotic airflow and triggering a series of chain reactions, ultimately leading to abnormal furnace conditions. Analyzing the control of gas flow from the charging angle perspective, a small angle results in a small charge throwing radius, causing the charge to shift towards the center of the furnace throat. Insufficient charge at the edges can lead to excessive development of the edge gas flow, causing overheating of the furnace walls, increased furnace top temperature, and even furnace shell burn-through. A large angle causes the charge to move away from the center of the furnace throat, resulting in blockage of the central gas flow. Excessive charge at the edges can inhibit the edge gas flow path, leading to low furnace wall heat load and potentially causing abnormal furnace conditions such as poor charge feeding. Regardless of whether the angle is too large or too small, it will cause chaotic gas flow, leading to decreased reduction reaction efficiency, increased coke ratio, insufficient hearth heat, and affecting pig iron quality. From the perspective of blast furnace operation, a deviation in the chute angle will cause the coke platform to shift, resulting in excessive differences in the permeability of the blocky zones, inducing abnormal furnace conditions such as charge collapse and suspension, forcing the blast furnace to reduce blast, severely reducing production efficiency.

[0005] In summary, precise control of the charge level is a core aspect of refined blast furnace operation. This requires regular monitoring of the chute tilting angle, simulation of the charge distribution at the throat, and ensuring that the operating parameters match the blast furnace smelting requirements.

[0006] Blast furnaces are closed, high-pressure containers during production, and the distribution of the furnace charge inside is not visible. The charge flow can only be seen when the furnace top cover is opened during shutdown and the charge is distributed. However, there are still drawbacks. During the distribution process, a large amount of dust from the raw materials will be stirred up, affecting the observation of the charge distribution. Moreover, there is a height difference of about 5 meters between the observation position and the charge surface, and errors are inevitable in visual observation. Therefore, it is crucial to invent a charge distribution measurement device. Summary of the Invention

[0007] The purpose of this invention is to provide a method for measuring the blast furnace ironmaking charge surface that can accurately locate the landing point of the charge during the blast furnace shutdown period, measure the width of the charge flow, and quantify the weight distribution of the charge in different regions.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] This invention provides a method for simulating the landing point of the charge during blast furnace charging, specifically comprising:

[0010] (1) After the blast furnace is shut down, organize on-site personnel to assemble iron drawer boxes on the furnace top platform. The length of the drawer boxes should be assembled according to the radius of the blast furnace throat. After multiple drawer boxes are assembled firmly, install a laser pointer and light it up. This will help confirm the position of the furnace charge distribution measuring device in the blast furnace.

[0011] (2) Pass steel wire ropes through the front and back drawers, pass the steel wire ropes through the fixed pulleys above the large square cover, and finally fix the two sets of steel wire ropes to the two sets of winches respectively.

[0012] (3) After the blast furnace top cover and manhole are opened, the furnace charge distribution measuring device is lowered to the blast furnace charge surface through the furnace top cover. The position of the furnace charge distribution measuring device is adjusted by tightening and loosening the steel wire rope with a winch. Finally, one end of the furnace charge distribution measuring device is close to the furnace wall and the other end is in the center of the blast furnace.

[0013] (4) Charge the material according to the requirements of the blast furnace operator. After the material is charged, the two sets of wire ropes work together to move the material charging detection device to the furnace top platform.

[0014] (5) Blast furnace operators collect data on the height, weight and distribution of the furnace charge in each drawer, and summarize the distribution pattern of the furnace charge to guide the adjustment of the blast furnace charging operation system.

[0015] Furthermore, the initial feeding angle of the coke should be less than 44°.

[0016] Furthermore, the minimum limiting angle of the material chute during coke distribution should not be less than 16°.

[0017] Furthermore, this method effectively avoids the problem of obstructed vision caused by dust rising inside the blast furnace after the blast furnace charge is placed, and can accurately detect the shape of the blast furnace charge.

[0018] Furthermore, this method can simultaneously perform quantitative statistical analysis of the fabric patterns of fixed-point fabric, fan-shaped fabric, and ring-shaped fabric under different material structures.

[0019] Furthermore, this method can assess the adaptability of the material distribution chute inclination angle based on the material storage status in the material drawer area, and calibrate core process control parameters such as the limit material distribution angle for different raw materials.

[0020] Furthermore, this method can provide a scientific and reliable technical basis for optimizing and adjusting the blast furnace charging system, ultimately ensuring the long-term stable and smooth operation of the blast furnace.

[0021] The length of the device is determined by the radius of the blast furnace throat on site. The charging point measuring device consists of multiple iron drawers. Each drawer is 0.35 meters long and wide and 0.5 meters high. There are scale markings inside the drawers. Multiple drawers are fixed together with bolts on the side walls to ensure a seamless fit between the drawers. A laser pointer fixing slot and an anti-smashing device are set at the center of the outer wall of the iron drawer. The front and rear drawers of the charging point measuring device have pulleys through which steel wire ropes can pass.

[0022] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0023] Compared to traditional blast furnace burden measurement methods, this method effectively avoids the visibility obstruction caused by dust rising from the furnace after the burden is distributed. It can accurately detect the burden distribution pattern and quantify the distribution patterns of fixed-point, fan-shaped, and annular burdens under different material structures. Furthermore, based on the burden level in the drawer area, this method can assess the suitability of the burden chute inclination angle and calibrate key process control parameters such as the limit burden angles for different raw materials and fuels. This provides a scientific and reliable technical basis for optimizing and adjusting the blast furnace charging system, ultimately ensuring the long-term stable operation of the blast furnace. Detailed Implementation

[0024] The technical solution of the present invention will be described in detail below with reference to the embodiments.

[0025] The technology of this invention was used to measure the distribution of coke at different angles in a 4000m³ blast furnace.

[0026] The implementation steps are as follows:

[0027] (1) After the blast furnace is shut down, organize on-site personnel to assemble iron drawer boxes on the furnace top platform. The length of the drawer boxes should be 6 meters according to the radius of the blast furnace throat. After multiple drawer boxes are assembled firmly, install a laser pointer and light it up. This will help confirm the position of the furnace charge distribution measuring device in the blast furnace.

[0028] (2) Pass steel wire ropes through the front and back drawers, pass the steel wire ropes through the fixed pulleys above the large square cover, and finally fix the two sets of steel wire ropes to the two sets of winches respectively.

[0029] (3) After the blast furnace top cover and manhole are opened, the furnace charge distribution measuring device is lowered to the blast furnace charge surface through the furnace top cover. The position of the furnace charge distribution measuring device is adjusted by tightening the steel wire rope with a winch. Finally, one end of the furnace charge distribution measuring device is close to the furnace wall and the other end is in the center of the blast furnace.

[0030] (4) The material is placed according to the requirements of the blast furnace operator. After the material is placed, the two sets of wire ropes work together to move the material placing detection device to the furnace top platform.

[0031] (5) Blast furnace operators collect data on the height, weight and distribution of the furnace charge in each drawer, and summarize the distribution pattern of the furnace charge to guide the adjustment of the blast furnace charging operation system.

[0032] Example 1

[0033] After spreading the coke evenly in the iron drawer, the data was recorded as follows.

[0034] Table 1 Statistics on the Angle and Number of Turns of the Coke Feed Chute

[0035]

[0036] Table 2 Distribution of coke

[0037]

[0038] Table 1 shows that the angle of the charging chute gradually decreases from 44°. Table 2 shows that drawer 1 has the heaviest coke. When the charging chute is set at 44°, a large amount of coke accumulates at the edge of the charge surface. Due to the loose and porous structure of coke, it plays a guiding role in the airflow within the blast furnace; that is, the more coke there is, the stronger the airflow in the blast furnace. When the amount of coke at the edge increases significantly, it significantly promotes the formation of airflow at the edge of the blast furnace, leading to uncontrolled edge heat load and a significant increase in the fuel ratio. Simultaneously, at 44°, the coke flow collidees with the inner wall of the blast furnace, accelerating the wear of the refractory materials and reducing the service life of the blast furnace lining, which is detrimental to the longevity of the blast furnace body. Based on the above conclusions, a charging chute angle of 44° is too large for coke, resulting in excessive coke accumulation at the edge. The use of a 44° charging chute for coke should be avoided; the initial charging angle should be lower than 44°.

[0039] Example 2

[0040] After leveling the sintered ore in the iron drawer, the data was recorded as follows.

[0041] Table 3 Statistics on the Angle and Number of Turns of the Sintering Fabric Chute

[0042]

[0043] Table 4 Distribution of Sintered Ore

[0044]

[0045] Table 3 shows that the charging chute angle gradually decreases from 40.5°. Table 4 reveals that the first and second iron drawers contained no sinter, while the third drawer contained a small amount. Assuming a drawer length of 0.35 meters, the sinter is at least 0.7 meters away from the blast furnace wall. This excessive distance disrupts the orderly distribution of the charge at the blast furnace edge, exacerbates material segregation, hinders the improvement of blast furnace intensification, and wastes resources. Therefore, a 40.5° charging angle is unsuitable for the current production model, and blast furnace operators are advised to increase the initial charging angle for sinter.

[0046] Example 3

[0047] After spreading the coke evenly in the iron drawer, the data was recorded as follows.

[0048] Table 5 Statistics on the Angle and Number of Turns of the Coke Feed Chute

[0049]

[0050] Table 6 Distribution of coke

[0051]

[0052] Table 5 shows that the charging chute distributes coke in 5 rings at a 16° angle. Table 6 data shows that at 16°, the coke is mainly distributed in drawers 10-12. It can be calculated that the coke's landing point at 16° is concentrated approximately 3.85 meters from the blast furnace wall. However, the data shows coke in drawers 14 and 15, which should not be present. Analysis indicates that the small angle of the charging chute causes some coke to pop out from the edge, affecting normal charging distribution. Therefore, the recommended guidance for blast furnace operators is that the minimum angle of the charging chute should not be less than 16° when discharging coke.

[0053] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for simulating the landing point of the charge during blast furnace charging, characterized in that, Specifically, it includes: (1) After the blast furnace is shut down, organize on-site personnel to assemble iron drawer boxes on the furnace top platform. The length of the drawer boxes should be assembled according to the radius of the blast furnace throat. After multiple drawer boxes are assembled firmly, install a laser pointer and light it up. This will help confirm the position of the furnace charge distribution measuring device in the blast furnace. (2) Pass steel wire ropes through the front and back drawers, pass the steel wire ropes through the fixed pulleys above the large square cover, and finally fix the two sets of steel wire ropes to the two sets of winches respectively. (3) After the blast furnace top cover and manhole are opened, the furnace charge distribution measuring device is lowered to the blast furnace charge surface through the furnace top cover. The position of the furnace charge distribution measuring device is adjusted by tightening and loosening the steel wire rope with a winch. Finally, one end of the furnace charge distribution measuring device is close to the furnace wall and the other end is in the center of the blast furnace. (4) Charge the material according to the requirements of the blast furnace operator. After the material is charged, the two sets of wire ropes work together to move the material charging detection device to the furnace top platform. (5) Blast furnace operators collect data on the height, weight and distribution of the furnace charge in each drawer, and summarize the distribution pattern of the furnace charge to guide the adjustment of the blast furnace charging operation system.

2. The method for simulating the location of the charge landing point during blast furnace charging according to claim 1, characterized in that, The initial feeding angle of the coke should be less than 44°.

3. The method for simulating the location of the charge landing point during blast furnace charging according to claim 1, characterized in that, The minimum angle of the material chute during coke distribution should not be less than 16°.

4. The method for simulating the location of the charge landing point during blast furnace charging according to claim 1, characterized in that, This method effectively avoids the problem of obstructed vision caused by dust rising inside the blast furnace after the blast furnace charge is placed, and can accurately detect the shape of the blast furnace charge.

5. The method for simulating the location of the charge landing point during blast furnace charging according to claim 4, characterized in that, This method can simultaneously perform quantitative statistics on the fabric patterns of fixed-point fabric, fan-shaped fabric, and ring-shaped fabric under different material structures.

6. The method for simulating the location of the charge landing point during blast furnace charging according to claim 1, characterized in that, This method can determine the suitability of the material chute inclination angle and calibrate core process control parameters such as the limit material distribution angle for different raw materials based on the material storage status of the material drawer area.

7. The method for simulating the location of the charge landing point during blast furnace charging according to claim 6, characterized in that, This method can provide a scientific and reliable technical basis for optimizing and adjusting the blast furnace charging system, ultimately ensuring the long-term stable and smooth operation of the blast furnace.

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