Center throat pipe for improving parallel tank type blast furnace burden distribution segregation and burden distribution method

Abstract

The invention discloses a center throat pipe for improving parallel tank type blast furnace distribution segregation and a distribution method. The center throat pipe comprises a throat pipe body, and the upper portion of the throat pipe body is communicated with two charging buckets arranged side by side; a baffle is arranged in the throat pipe body; the baffle is vertically arranged and deviates from the center of the throat pipe body, and the baffle can rotate in the throat pipe body with the center line of the throat pipe body as the center. The parallel tank type bell-less material distribution device is improved, the baffle capable of freely rotating is additionally arranged in the center throat pipe, after entering the center throat pipe, furnace burden firstly impacts the semicircular baffle and then falls along the inner wall of the semicircular baffle, and the semicircular baffle is arranged near the center line of the blast furnace, so that the furnace burden can fall along the center line of the blast furnace; the falling point track of the furnace burden in the chute is reduced; as the furnace burden descends along the central line of the blast furnace, the phenomenon that the furnace burden falls on the circumference of the throat of the blast furnace and is subjected to mass segregation when the parallel tank type bell-less material distribution device distributes materials is improved.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace ironmaking, in particular to a central throat pipe and a material distribution method for improving material distribution segregation in a parallel-tank blast furnace. Background Art

[0002] Blast furnace ironmaking is the most important link in the entire steel production, and it is also the link that consumes the most resources. The long-term production practice of blast furnaces has proved that reasonable gas flow distribution is the core of blast furnace operation. The upper adjustment distribution process refers to the process of placing ore and coke into the throat of the blast furnace through the distribution device according to the prescribed distribution system. The distribution of the charge in the furnace directly affects the distribution morphology of the block belt, the speed of the chemical reaction between the gas and solid phases, the permeability of the block belt and other factors.

[0003] The parallel tank type bell-less charging device is one of the main equipment for charging large blast furnaces, which includes two charging tanks, a discharge funnel, a central throat and a chute. Due to its strong charging ability, high fault tolerance, flexible charging, and convenient maintenance, and it also meets the requirements of the blast furnace for sealing, the parallel tank type bell-less charging device is mostly used for charging equipment on the top of large blast furnaces at home and abroad. However, due to the special structure that the center line of the discharge port at the bottom of the two charging tanks of the parallel tank type bell-less charging device deviates from the center line of the blast furnace, the charge is discharged along the opposite side of the central throat during the descent process, resulting in the phenomenon of charge landing point and quality segregation at the throat of the blast furnace when the parallel tank type bell-less charging device is charging, which has an adverse effect on blast furnace production.

[0004] In the prior art, there are methods to improve the distribution segregation by reducing the diameter of the center throat and improving the internal structure of the center throat. Reducing the center throat can directly reduce the trajectory of the falling point of the charge on the chute, but it will affect the normal downward flow of the charge, and in severe cases, it will cause blockage. There are also improvements in the prior art to improve the internal structure of the center throat: First, adding an inner lining that is conducive to flow diversion can reduce the scouring and wear of the charge on the center throat, but the effect on improving the distribution segregation is not obvious; second, the center throat is designed at an angle, and when the charge is discharged along the inner wall of the center throat, it has the effect of converging to the center; however, when the material flow is large, this solution will also affect the normal downward flow of the charge, and in severe cases, it will cause blockage. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a central throat with good distribution effect for improving the distribution segregation of the parallel-tank blast furnace; the present invention also provides a distribution method for improving the distribution segregation of the parallel-tank blast furnace.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: it includes a throat pipe body, the upper part of the throat pipe body is connected to two parallel material tanks; a baffle is provided in the throat pipe body; the baffle is vertically arranged and deviated from the center of the throat pipe body, and the baffle can rotate in the throat pipe body with the center line of the throat pipe body as the center.

[0007] Furthermore, the cross section of the baffle is in the shape of a circular arc or an elliptical arc.

[0008] Furthermore, the center point of the cross section of the throat pipe body is located between the vertex and the center point of the circular arc or elliptical arc of the baffle.

[0009] Furthermore, the baffle is semicircular, and the ratio of the diameter of the baffle to the diameter of the tank discharge port is (0.5-1.5):1, and the ratio of the distance from the center of the baffle to the center line of the throat pipe body to the diameter of the tank discharge port is ≤0.6.

[0010] Furthermore, the distance between the top of the baffle and the top of the throat pipe body is no greater than the distance between the top of the throat pipe body and the discharge port of the material tank.

[0011] Furthermore, the ratio of the length of the baffle to the diameter of the discharge port of the material tank is 1-3.

[0012] Furthermore, a transmission device is provided; the transmission device can drive the baffle to rotate inside the throat pipe body.

[0013] In order to solve the above technical problems, the method of the present invention adopts the above central throat and tank type material distribution device, and the technical solution adopted includes the following steps: 1) when the discharge ports of the two material tanks are closed, ore is fed into one of the material tanks; 2) Turn the baffle plate so that it blocks the ore in the ore tank in the front and lower direction of the ore falling, ensuring that the ore falls along the center line of the blast furnace; 3) Open the discharge port of the ore tank, so that after the ore enters the central throat, it first hits the baffle, and then flows down along the inner wall of the baffle until the ore in the tank is emptied; 4) Feeding coke into another material tank; 5) Close the discharge port of the emptied material tank, turn the baffle to block the front and lower part of the ore in the material tank to ensure that the ore falls along the center line of the blast furnace; 6) Open the discharge port of the ore tank so that after the ore enters the central throat, it first hits the baffle and then flows down along the inner wall of the baffle until the ore in the tank is emptied; 7) Repeat steps 1 to 6 until the fabric is finished.

[0014] The beneficial effect produced by adopting the above technical scheme is that: the present invention improves the parallel-tank type bell-less charging device by adding a freely rotatable baffle inside the central throat. After the charge enters the central throat, it first hits the semicircular baffle and then falls along its inner wall. Since the semicircular baffle is arranged near the center line of the blast furnace, the charge can fall along the center line of the blast furnace, shortening the landing trajectory of the charge in the chute; since the charge falls along the center line of the blast furnace, the phenomenon of the charge landing point and quality segregation at the circumference of the blast furnace throat when the parallel-tank type bell-less charging device is used for charging is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Figure 1 is a front view of the central throat of the present invention; Figure 2 is a top view of the center throat of the present invention; Figure 3 This is a schematic diagram of the structure of a tank-type material distribution device using the central pipe; Figure 4 It is a schematic diagram comparing the trajectory of the furnace charge falling on the x-axis described in the present method and the conventional method; Figure 5 It is a schematic diagram comparing the trajectory of the furnace charge falling on the y-axis described in the present method and the conventional method; Figure 6 It is a schematic diagram of the trajectory of the falling point of the charge in the conventional method; Figure 7 It is a schematic diagram of the material landing trajectory of the furnace charge described in this method; Figure 8 It is a schematic diagram of the trajectory of the furnace charge falling on the chute described in the method; Fig. 9 1. It is a schematic diagram comparing the effective descending height from the central throat outlet to the chute surface in the present method and the conventional method; Fig.10 2. It is a schematic diagram comparing the speeds of the charge particles reaching the surface of the chute in the present method and the conventional method; Fig.11 1. It is a schematic diagram comparing the effective movement distance of charge particles in the chute described in the present method and the conventional method; Fig.12 1. It is a schematic diagram comparing the speed of charge particles at the chute outlet described in the present method and the conventional method; Fig.13 1. It is a schematic diagram comparing the trajectory of the furnace charge falling at the furnace throat described in the present method and the conventional method; Fig.14 It is a schematic diagram of dividing the furnace throat circumference into zones for measuring the quality of coke in each zone around the furnace throat circumference; Fig.15 Schematic diagram of the distribution of coke at the end of the central throat pipe according to the conventional method; Fig.16 is a schematic diagram of the distribution of coke at the end of the central throat pipe described in the method; Fig.17 Schematic diagram of the pressure of the coke stream on the central throat described in the conventional method; Fig.18 is a schematic diagram of the pressure of the coke stream on the central throat of the method; Fig.19 Schematic diagram of mass distribution of coke at the circumference of furnace throat according to conventional method; Fig. 20 Schematic diagram of mass distribution of coke at the circumference of furnace throat according to the method; Fig.21 This is a schematic diagram of the coke mass distribution in each area of ​​the 12 circles of coke distribution described in the conventional method; Fig. 22 is a schematic diagram of the distribution of coke mass in each area of ​​the 12 circles of coke distribution described in the method; Fig.23 It is a schematic diagram comparing the standard deviation of coke quality at the furnace throat circumference described in this method and the conventional method.

[0017] In the figure: 1 – material tank; 2 – discharge funnel; 3 – central throat pipe; 4 – chute; 31 – throat pipe body; 32 – collecting pipe; 33 – transmission device; 34 – baffle. DETAILED DESCRIPTION

[0018] Figure 1-3 As shown, the parallel tank feeding device includes a material tank 1, a discharge hopper 2, a central throat pipe 3 and a chute 4; the material tank 1 is provided with a discharge port at the bottom, and the material tank 1 is provided with two discharge ports which are arranged in parallel on the left and right; the discharge hopper 2 is located below the material tank 1, and the feed port at the upper part of the discharge hopper 2 is connected with the discharge ports of the two material tanks 1; the central throat pipe 3 is located below the discharge hopper 2, and the feed port at the upper part of the central throat pipe 3 is connected with the discharge port at the bottom of the discharge hopper 2; the chute 4 is located below the central throat pipe 3, and the feed port at the upper part of the chute 4 is connected with the discharge port at the lower part of the central throat pipe 3, and the discharge port at the lower part of the chute 4 is connected with the feed port of the blast furnace, and the feed port of the chute 4 is directly opposite to the center of the feed port of the blast furnace.

[0019] Figure 1-3As shown, the central throat pipe for improving the distribution segregation of the parallel tank blast furnace comprises a throat pipe body 31, a collecting pipe 32 and a baffle 34. The throat pipe body 31 is a runway-shaped tubular structure with arc edges on the left and right sides and two straight edges connecting the front and back sides. The two material tanks are connected to the left and right sides of the throat pipe body 31 respectively. The baffle 34 is arranged in the throat body 31. The baffle 34 is in the shape of a long strip, vertically arranged and deviated from the center of the throat body 31. The baffle 31 can rotate in the throat body 31 with the center line of the throat body as the center; in this way, the baffle 34 is eccentrically arranged in the throat body 31 and rotates eccentrically in the throat body; because the ore will fall obliquely to the opposite side when the material tank is discharged, that is, the falling trajectory of the ore in the left material tank is to the lower right, and the falling trajectory of the ore in the right material tank is to the lower left, thereby causing the falling direction of the ore to deviate from the center of the blast furnace; by rotating the baffle 34 to the opposite position of the material tank 1, the ore is blocked at the center of the throat body, so that the ore falls to the center of the blast furnace.

[0020] Figure 1-3 As shown, the central throat pipe 3 of the improved parallel tank blast furnace distribution segregation, the cross section of the baffle 34 is circular arc or elliptical arc, and the center point of the cross section of the throat pipe body 31 is located between the vertex and the center point of the circular arc or elliptical arc of the baffle, so as to realize the eccentric setting of the baffle. The cross section of the baffle 34 is preferably semicircular, and the diameter d of the semicircular baffle is 挡板 Diameter d of the tank outlet 出料 The ratio is: d 挡板 :d 出料 =(0.5~1.5):1; the distance d1 from the center of the semicircular baffle to the center line of the throat pipe body and the diameter d of the tank outlet 出料 The ratio is: d1:d 出料 ≤0.6; the length l of the semicircular baffle and the diameter d of the tank outlet 出料 The ratio is: l:d 出料 =(1~3):1; the distance d2 between the top of the baffle and the top of the throat pipe body is not greater than the distance d3 between the top of the throat pipe body and the discharge port of the tank, that is, d2≤d3; the outlet diameter d of the collecting pipe 32 汇集 With the material tank outlet d 出料 The ratio of the diameters is: d 汇集 :d 出料 =(0.5~1.5):1. For example, the diameter of the tank outlet d 出料 =800mm: the vertical distance between the upper end of the semicircular baffle and the upper end of the box with the semicircular baffle is 0-1600mm; the distance from the center of the semicircular baffle to the center line of the blast furnace is 0-480mm; the diameter of the semicircular baffle is 400-1200mm; the length of the semicircular baffle is 800-2400mm; the diameter of the collecting pipe discharge port is 400-1200mm.

[0021] Figure 1-3 As shown, the central throat pipe 3 for improving the distribution segregation of the parallel tank blast furnace also includes a transmission device 33, which is used to drive the baffle 34 to rotate around the center line of the throat pipe body 31. The transmission device 33 includes a bevel gear set and a transmission shaft; the transmission shaft is vertically arranged at the center of the throat pipe body 31, the lower end is connected to the baffle 34, and the upper end extends out of the throat pipe body 31; the bevel gear set includes two bevel gears, namely the first bevel gear and the second bevel gear; the first bevel gear is coaxially fixed to the upper end of the transmission shaft, the second bevel gear is meshed with the first bevel gear, and the second bevel gear is connected to the power device; in this way, the power device drives the second bevel gear to rotate, and the second bevel gear drives the first bevel gear and the transmission shaft to rotate accordingly, thereby driving the baffle 34 to rotate around the center line of the throat pipe body 31; the transmission range of the transmission device 33 is 0 to 360 degrees.

[0022] The method for improving the charging segregation of the parallel tank blast furnace adopts the parallel tank charging device with the central throat pipe, and comprises the following steps: 1) when the discharge ports of the two charging tanks are closed, feeding ore into one of the charging tanks; 2) Rotate the second bevel gear to drive the first bevel gear and the baffle 34 to rotate, so that the baffle 34 blocks the ore in the ore tank in the lower front direction of the ore falling direction, ensuring that the ore falls along the center line of the blast furnace; 3) Open the discharge port of the ore tank, so that after the ore enters the central throat pipe 3, it first hits the baffle 34, and then flows down along the inner wall of the baffle 34 until the ore in the tank is emptied; 4) Feeding coke into another material tank; 5) Close the discharge port of the emptied material tank, rotate the second bevel gear, drive the first bevel gear and the baffle 34 to rotate, so that the baffle 34 blocks the front and lower part of the ore falling direction in the material tank filled with ore, and ensure that the ore falls along the center line of the blast furnace; 6) Open the discharge port of the ore tank, so that after the ore enters the central throat pipe 3, it first hits the baffle 34, and then flows down along the inner wall of the baffle 34 until the ore in the tank is emptied; 7) Repeat steps 1 to 6 until the fabric is finished.

[0023] The particle model method is used to analyze the distribution process of this method. The particle model method regards the charge as a particle without particle size, regardless of the shape and particle size of the charge, analyzes the force conditions of the particle at different stages of the distribution process, and uses the motion equation to describe the distribution process.

[0024] In this method, after the center throat is improved and a semicircular baffle is added, the charge first hits the semicircular baffle after entering the center throat, and then falls along its inner wall. Since the semicircular baffle is set near the center line of the blast furnace, the charge can fall along the center line of the blast furnace, shortening the trajectory of the charge falling in the chute, such as Figure 4-8 As shown, the rotation angle in the figure refers to the rotation angle of the chute.

[0025] In order to evaluate the improvement effect of the burden distribution device modification on the segregation of charge landing points at the furnace throat circumference, the effective descending height of charge particles from the center throat outlet to the chute surface, the speed at the chute surface, the effective distance in the chute, the speed at the end of the chute, the movement time in the chute and the landing point position in the furnace throat were analyzed.

[0026] The height of the charge particles falling from the center throat outlet to the chute surface is not only determined by objective factors such as the chute hanging height, chute tilting moment, chute inclination angle, chute radius, but also by the distance between the charge particles and the center line of the blast furnace and the circumferential angle of the chute. Therefore, the height of the charge particles falling from the center throat outlet to the chute surface in different schemes is analyzed. Fig. 9 shown.

[0027] The speed of the charge particles at the center throat outlet and the effective descending height of the charge particles from the center throat outlet to the chute surface jointly determine the speed of the charge particles reaching the chute surface, thereby affecting the speed of the charge particles at the end of the chute and the trajectory of the throat circumference. Therefore, it is necessary to analyze the speed of the charge particles reaching the chute surface under different schemes, such as Fig.10 shown.

[0028] Since the charge particles land at different points on the chute surface, the effective movement distance in the chute is also different. A quantitative analysis is conducted on the effective movement distance of the charge particles in the chute in the original and modified solutions, such as Fig.11 shown.

[0029] The speed of the charge particles reaching the surface of the chute and the effective movement distance of the charge in the chute jointly determine the speed of the charge particles at the end of the chute. The speed at the end of the chute directly affects the trajectory of the charge particles landing on the circumference of the furnace throat. Therefore, the speed of the charge particles at the end of the chute in the original and modified solutions is calculated. The calculation results are as follows: Fig.12 shown.

[0030] The original and modified solutions can be calculated by formula: When the chute distribution angle is 40°, the trajectory of the falling point of the charge particles at the furnace throat is as follows: Fig.13 shown.

[0031] By comparison, it can be seen that the speed and movement time of the charge particles in the central throat with the addition of a semicircular baffle are more uniform, with smaller extreme values, thus achieving the effect of improving the charge landing point and quality segregation at the throat.

[0032] Numerical simulation: The particle model ignores the influence of the interaction between particles on the material flow trajectory. Therefore, it is necessary to use the discrete element method based on Newton's second law to numerically simulate the improvement scheme.

[0033] The original and improved distribution devices were numerically simulated using coke. Table 1-1 below shows the number of coke particles and the total mass of particles during the simulation process. Table 1-1: Quality and quantity of coke in numerical simulation

[0034] The particle size distribution and mass percentage of coke are shown in Table 1-2; Table 1-2: Particle size distribution and mass proportion of coke in numerical simulation

[0035] The parameters of the sliding friction coefficient, rolling friction coefficient, restitution coefficient, Poisson's ratio, and Young's modulus of coke are shown in Tables 1-3 and 1-4 below; Table 1-3: Various parameters of coke in numerical simulation

[0036] Table 1-4: Various parameters of coke in numerical simulation

[0037] In order to measure the quality of coke in each area around the furnace throat, the furnace throat circumference is divided into zones. Fig.14 As shown. The right side 90° direction is area 1, and the areas are numbered counterclockwise. A total of 12 areas are set, and the area of ​​each area is equal. The coke is distributed, and the distribution conditions of the first 12 rounds are intercepted and counted.

[0038] The following is the coke feeding in the right tank, with a feed line height of 1.5 m. The feeding angle of the chute is 40°, and the flow rate is 8 r / min -1 The numerical simulation results of the cloth rotating 12 times counterclockwise at a speed of: In this method, the original central throat pipe is changed to a central rear pipe with a semicircular baffle inside. Numerical simulation is conducted on the original and improved distribution devices when charging coke into the blast furnace. The distribution of coke at the end of the central throat pipe is shown in Figure 2. Fig.15 , 16As shown, the center of the coke flow at the outlet of the original center throat is 224.25 mm away from the center line of the blast furnace, and the center of the coke flow at the outlet of the center throat with an additional semicircular baffle is 58.04 mm away from the center line of the blast furnace. The measurement results show that the center of the coke flow in the center throat with an additional semicircular baffle moves 166.21 mm toward the center line of the blast furnace, which can effectively improve the extreme value of the axial landing trajectory of the charge on the chute, thereby improving the landing segregation and quality segregation of coke at the throat.

[0039] The pressure of coke flow on the center throat is as follows Fig.17 , 18 As shown in the figure, the greater the pressure of the coke flow on the central throat, the greater the scouring of the coke flow on the central throat, and the more serious the wear of the central throat. By comparison, it can be seen that the pressure of the coke flow on the central throat in the original scheme is 900N, and the pressure of the coke flow on the central throat in the improved scheme is 350N. The central throat with a semicircular baffle can effectively avoid the scouring and wear of the furnace charge on the central throat and extend the service life of the central throat.

[0040] When the material is laid for 12 turns, the quality of the material in each area is as follows: Fig.19 , 20 As shown, the original scheme has a large difference in the mass distribution of the charge in each area of ​​the furnace throat, and a maximum value appears in the seventh area. The mass of coke in the seventh area is 144.51kg higher than the average mass of each area; the improved scheme has a more uniform mass distribution in each area, and a maximum value appears in the third area. The mass of coke in the third area is 47.29kg higher than the average mass of each area, which is 67.3% lower than the original scheme. In the original scheme, the average mass of each area is 1119.34kg when the coke is distributed in 12 circles. In the improved scheme, the average mass of each area is 1118.56kg when the coke is distributed in 12 circles, which is 0.78kg less than the original discharge funnel, accounting for 0.07%. Therefore, the effect of adding a semicircular baffle on the distribution rate can be ignored.

[0041] For the convenience of observation, the mass distribution of coke in each area is made into a bar graph, such as Fig.21 , 22 As shown in the figure, the original scheme has a large extreme value of 244.42 kg in the coke mass distribution in each area around the throat, while the improved scheme has a small extreme value of 72.05 kg in the coke mass distribution in each area around the throat, which is 70.5% less than the original scheme. In the original scheme, the area with the largest coke mass is area seven, and the area with the smallest coke mass is area one, while in the improved scheme, the coke mass distribution in each area is more uniform, without obvious maximum and minimum areas.

[0042] like Fig.23As shown in the figure, with the increase of the number of feeding circles, the standard deviation of the quality of coke in the circumferential direction of the furnace throat in the original scheme is constantly increasing; the standard deviation of the quality of coke in the circumferential direction of the furnace throat in the improved scheme fluctuates up and down and the growth rate is slow. By comparing the two, the standard deviation of the quality of coke in the circumferential direction of the furnace throat in the original scheme increases rapidly, and its standard deviation is 71.60 at the twelfth circle. The standard deviation of the quality of coke in the circumferential direction of the furnace throat in the improved scheme increases slowly, and its standard deviation is 21.80 at the twelfth circle, which is 69.6% less than the original feeding funnel.

Claims

1. A central throat pipe for improving the distribution segregation of the blast furnace with tanks, characterized in that: The invention comprises a throat pipe body (31), the upper part of which is connected to two material tanks (1) arranged in parallel; a baffle (34) is arranged inside the throat pipe body (31); the baffle (34) is arranged vertically and deviates from the center of the throat pipe body (31); the baffle (34) can rotate inside the throat pipe body (31) with the center line of the throat pipe body as the center.

2. The central throat pipe for improving the distribution segregation of the parallel-tank blast furnace according to claim 1, characterized in that: The cross section of the baffle (34) is in the shape of a circular arc or an elliptical arc.

3. The central throat pipe for improving the distribution segregation of the parallel-tank blast furnace according to claim 2, characterized in that: The center point of the cross section of the throat pipe body (31) is located between the vertex and the center point of the circular arc or elliptical arc of the baffle (34).

4. The central throat pipe for improving the distribution of materials in a parallel-tank blast furnace according to claim 2, characterized in that: The baffle (34) is semicircular, the ratio of the diameter of the baffle (34) to the diameter of the tank outlet is (0.5-1.5):1, and the ratio of the distance from the center of the baffle (34) to the center line of the throat pipe body to the diameter of the tank outlet is ≤0.

6.

5. The central throat pipe for improving the distribution segregation of the parallel-tank blast furnace according to claim 4, characterized in that: The distance between the top of the baffle (34) and the top of the throat pipe body (31) is no greater than the distance between the top of the throat pipe body and the material tank outlet.

6. The central throat pipe for improving the distribution of materials in a parallel-tank blast furnace according to claim 4, characterized in that: The ratio of the length of the baffle (34) to the diameter of the material tank outlet is 1 to 3.

7. A central throat pipe for improving charge distribution segregation in a parallel-tank blast furnace according to any one of claims 1 to 6, characterized in that: A transmission device is also provided; the transmission device can drive the baffle (34) to rotate inside the throat pipe body (31).

8. A method for improving the segregation of charge distribution in a parallel-tank blast furnace, using the parallel-tank charge distribution device with a central throat pipe as claimed in claims 1 to 6, characterized in that: The method comprises the following steps: 1) feeding ore into one of the two material tanks when the discharge ports of the two material tanks are closed; 2) rotating the baffle (34) so ​​that the baffle is located at the lower front side of the ore falling direction in the ore tank, ensuring that the ore falls along the center line of the blast furnace; 3) opening the discharge port of the ore tank, so that after the ore enters the central throat (3), it first hits the baffle (34), and then flows down along the inner wall of the baffle until the ore in the tank is emptied; 4) Feeding coke into another material tank; 5) Close the discharge port of the emptied material tank, rotate the baffle (34) so ​​that the baffle blocks the front and lower part of the ore in the material tank in the direction of ore falling, and ensure that the ore falls along the center line of the blast furnace; 6) opening the discharge port of the ore tank, so that after the ore enters the central throat (3), it first hits the baffle (34), and then flows down along the inner wall of the baffle until the ore in the tank is emptied; 7) Repeat steps 1 to 6 until the fabric is finished.

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