A discharge hopper and a discharging method for improving burden distribution of a top and bottom combined blast furnace

Abstract

The application discloses a discharge hopper for improving burden segregation of a parallel tank type blast furnace and a discharging method, and belongs to the technical field of blast furnace iron-making.The structure comprises a tank, a discharge hopper and a collecting pipe, the lower end of a discharge port of the tank is communicated with the upper end of the discharge hopper, the tank is symmetrical about the center line of the blast furnace, the bottom of the discharge hopper is communicated with a plurality of collecting pipes, the discharge port of each collecting pipe is communicated with the feeding port of a guide pipe, the guide pipes are symmetrically distributed about the center line of the blast furnace, the discharge ports of the plurality of guide pipes intersect and a central throat pipe is installed, the outlet of the central throat pipe is connected with a chute, and the chute is communicated with the blast furnace throat.The discharge hopper comprises a box body and a baffle, the baffle is symmetrically arranged on both sides of the upper end of the discharge hopper, and a throttle valve and a sealing valve are sequentially arranged from top to bottom in the discharge port of the tank.The application improves the phenomenon of burden drop point and quality segregation at the circumference of the blast furnace throat when the burden is distributed by the parallel tank type burden distribution device without a bell, and prolongs the service life of the central throat pipe.

Description

Technical Field

[0001] This invention relates to the field of blast furnace ironmaking technology, and in particular to a charging hopper and charging method for improving the distribution segregation of charge in a blast furnace. Background Technology

[0002] Blast furnace ironmaking is the most crucial and resource-intensive stage in the entire steel production process. Long-term blast furnace production practice has proven that a rational gas flow distribution is the core of blast furnace operation. In daily blast furnace operation, the charging system, as a means of "top adjustment," has become one of the main adjustment methods due to its flexibility and ease of operation. The top adjustment charging process refers to the process of distributing ore and coke into the blast furnace throat according to a prescribed charging system using a charging device. The distribution of the burden within the furnace directly affects factors such as the distribution morphology of the bulk charge, the rate of chemical reaction between the gas and solid phases, and the permeability of the bulk charge. Therefore, controlling the distribution of the burden within the furnace is of great significance. Due to its strong charging capacity, high fault tolerance, flexible charging, and convenient maintenance, and because it solves the blast furnace's sealing requirements, the parallel-bottle type bell-less charging device is widely used in the top charging equipment of large blast furnaces both domestically and internationally. However, due to the unique structure of the two charge hoppers in the bell-less charging device, where the center lines of the bottom outlets are offset from the blast furnace centerline, the charge deviates from the blast furnace center and flows along the wall of the central throat. As the chute rotates, this deviation leads to circumferential imbalance at the point of impact between the charge and the chute, affecting the circumferential landing point and mass segregation of the charge in the blast furnace throat. This landing point and mass segregation disrupts the circumferential gas distribution and negatively impacts blast furnace stability. Therefore, improving the bell-less charging device to reduce the landing point and mass segregation of the charge around the blast furnace throat is crucial. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides a charging hopper and charging method that improves the charging segregation of the charge in a parallel-boiler blast furnace. This avoids the charge hitting the side wall of the central throat, ensuring that the charge descends along the centerline of the blast furnace. It improves the phenomenon of charge landing point and mass segregation at the circumference of the blast furnace throat when the charge is charged using a parallel-boiler bell-less charging device. On the other hand, the collision between the two charge streams reduces the scouring and wear of the charge on the side wall of the central throat, extending the service life of the central throat.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] A feeding hopper for improving the distribution segregation of charge in a blast furnace includes a box body, a collecting pipe, and a guide pipe. The upper end of the box body is connected to the lower end of the charge tank outlet. The charge tank and the box body are symmetrical about the center line of the blast furnace. The bottom of the box body is connected to multiple collecting pipes. The outlet of each collecting pipe is connected to the inlet of the guide pipe. The guide pipes are symmetrically distributed about the center line of the blast furnace, and the outlets of the multiple guide pipes intersect. A left baffle and a right baffle are installed inside the box body. The left and right baffles are the same shape and size and are symmetrically arranged on both sides of the upper end of the box body. A throttling valve and a sealing valve are sequentially installed from top to bottom in the charge tank outlet.

[0006] Furthermore, one end of the left and right baffles is fixed to the side wall of the box, and the tilt angle of the left and right baffles can be freely adjusted.

[0007] Furthermore, a central throat pipe is installed at the intersection of the feed pipe and the discharge port, and the outlet of the central throat pipe is connected to a chute, which is suspended above the blast furnace throat.

[0008] Furthermore, the ratio of the vertical distance between the upper end of the left baffle and the upper end of the box to the diameter of the material tank outlet is 0.1 to 1, and the ratio of the vertical distance between the upper end of the right baffle and the upper end of the box to the diameter of the material tank outlet is 0.1 to 1.

[0009] Furthermore, the ratio of the long side of the left baffle to the diameter of the material tank outlet is 1 to 2.5, and the ratio of the short side of the left baffle to the diameter of the material tank outlet is 0.2 to 0.8.

[0010] Furthermore, the ratio of the area of ​​the feed inlet of the feed pipe to the area of ​​the discharge outlet of the material tank is 0.6-1.5.

[0011] Furthermore, the ratio of the vertical distance from the center of the feed pipe inlet to the center line of the blast furnace to the diameter of the feed tank outlet is 0.6 to 1.5.

[0012] Furthermore, the ratio of the area of ​​the discharge port of the guide pipe to the area of ​​the discharge port of the material tank is 0.5 to 1.

[0013] Furthermore, the ratio of the vertical distance from the center of the discharge port of the feed pipe to the center line of the blast furnace to the diameter of the discharge port of the feed hopper is 0.2 to 0.8.

[0014] A feeding method for a feeding hopper that improves the distribution of charge in a blast furnace is as follows:

[0015] The charging conveyor belt loads the furnace charge into the charging hopper, closes the upper sealing valve, and completes the pressure equalization of the charging hopper, awaiting charging into the blast furnace. When the charging signal is received and the charging hopper outlet is above the left baffle, adjust the angle between the left baffle and the horizontal plane. The angle between the left baffle and the upper horizontal plane of the box should be 20° to 70°, and the right baffle should be perpendicular to the upper horizontal plane of the box. Then, open the lower sealing valve and the throttle valve in sequence. At this time, the furnace charge with a certain initial velocity flows out of the charging hopper outlet first. As the furnace charge continues to descend, it first contacts the left baffle in the box. The width of the left baffle is less than the width of the material flow. The left baffle transfers 0.4-0.6 times the volume of the furnace charge to the collecting pipe below the right baffle. The remaining 0.4-0.6 times the volume of the furnace charge naturally falls into the collecting pipe below the left baffle. The charge in the collecting pipe then falls into the guide pipe connected to the outlet of the collecting pipe. The guide pipes are symmetrically distributed about the blast furnace centerline. The charge passing through the guide pipes collides and aggregates at the blast furnace centerline, forming a new flow. The charge then descends through the central throat into the chute, and finally, the chute carries the furnace charge. The material is fed into the blast furnace, completing the feeding process of one charging hopper. When the charging signal is received and the charging hopper outlet is above the right baffle, adjust the angle between the left baffle and the upper horizontal plane of the box, and adjust the angle between the right baffle and the horizontal plane. The angle between the right baffle and the upper horizontal plane of the box should be 20° to 70°, and the left baffle should be perpendicular to the upper horizontal plane of the box. Then, open the lower sealing valve and the throttle valve in sequence. At this time, the furnace charge with a certain initial velocity flows out of the charging hopper outlet first. The furnace charge continues to fall and first hits the right baffle in the box. Upon contact, the width of the right baffle is less than the width of the material flow. The right baffle transfers 0.4-0.6 times the volume of the furnace charge to the collecting pipe below the left baffle. The 0.4-0.6 times the volume of the furnace charge naturally falls into the collecting pipe below the right baffle. The furnace charge in the collecting pipe falls into the guide pipe connected to the outlet of the collecting pipe. The furnace charge collides and aggregates with each other at the center line of the blast furnace, forming a new material flow. The furnace charge descends through the central throat into the chute, and finally the chute sends the furnace charge into the blast furnace, completing the feeding process of another charge hopper.

[0016] The beneficial effects of this invention are:

[0017] In the technical solution of this invention, since the upper end of the box with baffles is connected to the discharge port of the blast furnace, the furnace charge first enters the box with baffles. Because the baffles are located below the discharge port at the bottom of the blast furnace, when the furnace charge falls onto the baffles, 0.4 to 0.6 times its volume of charge is transferred to the collecting pipe on the opposite side of the baffles, and the remaining 0.4 to 0.6 times its volume naturally falls into the collecting pipe below. After entering the box, the charge enters the corresponding guide pipe through the collecting pipe. The guide pipes are symmetrically distributed about the centerline of the blast furnace, so during the descent, the charge will collide and aggregate at the centerline of the blast furnace, forming a flow of charge. The collision of the two material streams cancels out the horizontal velocity component of the material streams. On the one hand, this avoids the furnace charge hitting the side wall of the central throat, ensuring that the furnace charge descends along the center line of the blast furnace and improving the phenomenon of the furnace charge landing point and mass segregation at the circumference of the blast furnace throat when the charge is distributed by the parallel pot type bell-less charging device. On the other hand, the collision of the two material streams can reduce the scouring and wear of the furnace charge on the side wall of the central throat, and extend the service life of the central throat. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the internal structure of a charging hopper for improving the segregation of charge distribution in a blast furnace, provided by the present invention.

[0019] Figure 2 This is a left view of a feeding hopper for improving the distribution segregation of charge in a blast furnace, provided by the present invention.

[0020] Figure 3 This is a top view of a feeding hopper for improving the distribution segregation of charge in a blast furnace, provided by the present invention.

[0021] Figure 4 This is a schematic diagram of the furnace charge distribution provided by the present invention;

[0022] Figure 5 This invention provides a diagram showing the distance between the points of the furnace charge in different circumferential directions along the length and cross-sectional direction of the chute when using a conventional funnel for material distribution.

[0023] Figure 6 This is a diagram showing the distance between the landing points of the furnace charge in different circumferential directions in the length direction and the cross-sectional direction of the chute when the material is fed through the feeding funnel in the technical solution of this invention.

[0024] Figure 7 This is a comparison diagram of the distance between the landing points of the furnace charge in different circumferential directions along the length of the chute when the ordinary funnel provided by the present invention and the feeding funnel in the technical solution of the present invention are feeding materials.

[0025] Figure 8 This is a comparison diagram of the distance between the landing points of furnace charge in different circumferential directions in the chute cross-section direction when the ordinary funnel provided by the present invention and the feeding funnel in the technical solution of the present invention are feeding materials.

[0026] Figure 9 This is a comparison diagram of the trajectory of the furnace charge falling into the chute provided by the present invention.

[0027] Figure 10 This is a comparison diagram of the effective descent height of the furnace charge particles from the central throat outlet to the chute surface in the ordinary funnel provided by this invention and the feeding funnel in the technical solution of this invention.

[0028] Figure 11 This is a comparison chart showing the speed at which the furnace charge particles reach the chute between the ordinary funnel provided by this invention and the feeding funnel in the technical solution of this invention.

[0029] Figure 12 This is a comparison diagram of the effective movement distance of the ordinary funnel provided by this invention and the feeding funnel in the technical solution of this invention within the chute;

[0030] Figure 13 This is a comparison diagram of the speed at which the furnace charge particles reach the end of the chute between the ordinary funnel provided by this invention and the feeding funnel in the technical solution of this invention;

[0031] Figure 14 This is a comparison diagram of the movement time of the furnace charge particles in the chute between the ordinary funnel provided by this invention and the feeding funnel in the technical solution of this invention;

[0032] Figure 15 This is a comparison diagram of the trajectory of the furnace charge at the furnace throat provided by the present invention;

[0033] Figure 16 This is a schematic diagram of the circumferential partitioning of the furnace throat provided by the present invention;

[0034] Figure 17 This is a distribution diagram of ordinary funnel-shaped pellets at the end of the central throat provided by the present invention;

[0035] Figure 18 This is a distribution diagram of the pellet feed hopper at the end of the central throat in the technical solution of this invention.

[0036] Figure 19 This invention provides a pressure diagram of the flow of ordinary funnel pellet ore against the central throat.

[0037] Figure 20 This is a pressure diagram of the feed funnel pellet ore flow on the central throat in the technical solution of this invention;

[0038] Figure 21 This is a schematic diagram of the material distribution state after eleven turns of ordinary funnel pellet ore distribution, provided by the present invention.

[0039] Figure 22 This is a schematic diagram of the pellet ore distribution state after eleven rounds of distribution using the technical solution of this invention.

[0040] Figure 23 This invention provides a diagram showing the mass distribution of pellets in different areas around the furnace throat when using a conventional funnel to feed pellets.

[0041] Figure 24 This is a diagram showing the mass distribution of pellets in different areas around the furnace throat during the feeding of pellets in the feeding hopper of the present invention.

[0042] Figure 25 This invention provides a quality distribution diagram of pellets in each region when using a common funnel to distribute pellets.

[0043] Figure 26 This is a mass distribution diagram of pellets in each region when using the feeding funnel of the present invention to distribute pellets;

[0044] Figure 27 This is a comparison chart of the standard deviation of pellet quality in different regions during pellet feeding, as provided by the present invention.

[0045] Figure 28 This is a distribution diagram of ordinary funnel coke at the end of the central throat provided by the present invention;

[0046] Figure 29 This is a distribution diagram of coke in the feeding hopper at the end of the central throat in the technical solution of this invention.

[0047] Figure 30 This invention provides a pressure diagram of coke feed flow in a conventional funnel against a central throat.

[0048] Figure 31 This is a pressure diagram of the coke material flow in the feeding hopper against the central throat in the technical solution of this invention.

[0049] Figure 32 This is a schematic diagram of the fabric state after eleven turns of ordinary funnel coke fabric provided by the present invention;

[0050] Figure 33 This is a schematic diagram of the coke feeding state after eleven rounds of feeding using the feeding funnel in the technical solution of this invention.

[0051] Figure 34 This invention provides a diagram showing the mass distribution of pellets in different areas around the furnace throat when using a conventional funnel to feed coke.

[0052] Figure 35 This is a diagram showing the mass distribution of pellets in different areas around the furnace throat during the feeding hopper feeding coke in the technical solution of this invention.

[0053] Figure 36This is a mass distribution diagram of coke in each region during the feeding of coke using a conventional funnel, as provided by the present invention.

[0054] Figure 37 This is a mass distribution diagram of coke in each region during the feeding hopper feeding process provided by the present invention.

[0055] Figure 38 This is a comparison chart of the standard deviation of coke quality in different regions during the coke feeding process provided by the present invention.

[0056] The reference numerals in the accompanying drawings include:

[0057] a-box body, b-collecting pipe, c-feed guide pipe, d-left baffle, e-right baffle. Detailed Implementation

[0058] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0059] like Figures 1 to 4 As shown, a feeding hopper for improving the distribution segregation of a blast furnace includes a box body a, a collecting pipe b, a guiding pipe c, a central throat, and a chute. The upper end of the box body a is connected to the lower end of the material tank outlet. The material tank and the box body a are symmetrical about the center line of the blast furnace. The bottom of the box body a is connected to multiple collecting pipes b. The outlet of each collecting pipe b is connected to the inlet of the guiding pipe c. The guiding pipes c are symmetrically distributed about the center line of the blast furnace. The outlets of the multiple guiding pipes c intersect and are connected to a central throat. The outlet of the central throat is connected to the chute, which is suspended above the blast furnace throat. A left baffle d and a right baffle e are installed inside the box body a. The left baffle d and the right baffle e are the same shape and size. The left baffle d and the right baffle e are symmetrically arranged on both sides of the upper end inside the box body a. A throttling valve and a sealing valve are sequentially installed from top to bottom in the material tank outlet.

[0060] One end of the left baffle d and the right baffle e are fixed to the side wall of the box a. The tilt angle of the left baffle d and the right baffle e can be freely adjusted. When the left baffle d and the right baffle e are not working, they are perpendicular to the upper horizontal plane of the box a. When the left baffle d and the right baffle e are working, the angle between them and the upper horizontal plane of the box a is 20° to 70°. The left baffle d and the right baffle e can transfer 0.4 to 0.6 times the volume of furnace charge to the collecting pipe b below the opposite baffle. The ratio of the vertical distance between the upper end of the left baffle d and the upper end of the box a to the diameter of the material tank outlet is 0.1 to 1. The ratio of the vertical distance between the upper end of the right baffle e and the upper end of the box a to the diameter of the material tank outlet is 0.1 to 1. The ratio of the long side of the left baffle d to the diameter of the material tank outlet is 1 to 2.5. The ratio of the short side of the left baffle d to the diameter of the material tank outlet is 0.2 to 0.8. The ratio of the area of ​​the feed inlet of the feed pipe c to the area of ​​the discharge outlet of the hopper is 0.6-1.5. The ratio of the vertical distance from the center of the feed inlet of the feed pipe c to the centerline of the blast furnace to the diameter of the discharge outlet of the hopper is 0.6-1.5. The ratio of the area of ​​the discharge outlet of the feed pipe c to the area of ​​the discharge outlet of the hopper is 0.5-1. The ratio of the vertical distance from the center of the discharge outlet of the feed pipe c to the centerline of the blast furnace to the diameter of the discharge outlet of the hopper is 0.2-0.8.

[0061] A feeding method for a feeding hopper that improves the distribution of charge in a blast furnace is as follows:

[0062] The charging conveyor belt loads the furnace charge into the charging hopper, closes the upper sealing valve, and completes the pressure equalization of the charging hopper, awaiting charging into the blast furnace. When the charging signal is received and the charging hopper outlet is above the left baffle d, the angle between the left baffle d and the horizontal plane is adjusted. The angle between the left baffle d and the upper horizontal plane of box a is 20° to 70°, and the right baffle e is perpendicular to the upper horizontal plane of box a. The lower sealing valve and the throttle valve are opened in sequence. At this time, the furnace charge with a certain initial velocity flows out of the charging hopper outlet first. The furnace charge continues to descend and first contacts the left baffle d in box a. The width of baffle d is less than the width of the material flow. The left baffle d transfers 0.4-0.6 times the volume of the furnace charge to the collecting pipe b below the right baffle e. The remaining 0.4-0.6 times the volume of the furnace charge naturally falls into the collecting pipe b below the left baffle d. The charge in collecting pipe b then falls into the guide pipe c, which is connected to the outlet of collecting pipe b. The guide pipe c is symmetrically distributed about the blast furnace centerline. The charge passing through guide pipe c collides and aggregates at the blast furnace centerline, forming a new flow. The charge then descends through the central throat into the chute, and finally, the chute carries the furnace charge. The material is fed into the blast furnace, completing the feeding process of one hopper. When the charging signal is received and the hopper outlet is above the right baffle e, the angle between the left baffle d and the upper horizontal plane of box a is adjusted, and the angle between the right baffle e and the horizontal plane is adjusted. The angle between the right baffle e and the upper horizontal plane of box a is 20° to 70°, and the left baffle d is perpendicular to the upper horizontal plane of box a. The lower sealing valve and the throttle valve are opened in sequence. At this time, the furnace charge with a certain initial velocity flows out of the hopper outlet first. The furnace charge continues to fall and first encounters the right baffle e in box a. Upon contact, the width of the right baffle e is less than the width of the material flow. The right baffle e transfers 0.4-0.6 times the volume of the furnace charge to the collecting pipe b below the left baffle d. The 0.4-0.6 times the volume of the furnace charge naturally falls into the collecting pipe b below the right baffle e. The material in the collecting pipe b falls into the guide pipe c connected to the outlet of the collecting pipe b. The furnace charge collides and aggregates with each other at the center line of the blast furnace, forming a new material flow. The furnace charge descends through the central throat into the chute, and finally the chute sends the furnace charge into the blast furnace, completing the feeding process of another charge hopper.

[0063] To further verify the effectiveness of this technical solution, the technical solution in this invention is evaluated using a point mass model and numerical simulation methods.

[0064] The particle model method treats the furnace charge as particle-free particles, disregarding their shape and particle size. It analyzes the forces acting on these particles at different stages of the charging process and uses equations of motion to describe the process. In this invention, the charging hopper divides the furnace charge into two streams, which fall through guide pipes c below the left baffle d and c below the right baffle e, respectively. They eventually converge at the central throat, forming a single flow. The collision of these flows cancels out the horizontal velocity of the charge, ensuring it falls along the blast furnace centerline and minimizing its trajectory at the chute, as follows: Figures 5 to 9 As shown. By comparing the furnace charge in a conventional feeding hopper with that in the feeding hopper of this invention, the effective descent height from the end of the central throat to the chute surface, the velocity reaching the chute surface, the effective distance within the chute, the velocity at the end of the chute, the movement time within the chute, and the landing point at the furnace throat are observed. Figures 10 to 14 As shown, the velocity and travel time of the furnace charge particles in the charging hopper of the present invention are more uniform and the extreme values ​​are smaller, thus achieving the effect of improving the landing point and mass segregation of the furnace charge at the furnace throat. In the charging hopper of the present invention, the two streams of charge collide with each other, and the velocity is less than that of the furnace charge in a conventional charging hopper. Therefore, the landing point of the furnace charge in the charging hopper of the present invention is closer to the centerline of the blast furnace. By increasing the chute angle, the landing point of the furnace charge in the charging hopper of the present invention is made the same as that in a conventional charging hopper. Thus, comparing the landing point segregation of the furnace charge at the blast furnace throat during charging using the charging hopper of the present invention and the conventional charging hopper, as follows: Figure 15 As shown.

[0065] Numerical simulation: The particle model neglects the influence of interparticle interactions on the material flow trajectory; therefore, a discrete element method based on Newton's second law is needed to numerically simulate the improved scheme. Numerical simulations of the original and improved feeding devices are performed using pellets and coke.

[0066] Table 1-1 Mass and quantity of pellets and coke in numerical simulation

[0067] Total mass / kg Particle count / 10,000 Pellet Ore 30000 90.5 coke 30000 24.64

[0068] Table 1-2 Particle size distribution and mass percentage of pellets and coke in numerical simulation.

[0069] Pellet particle diameter / mm Quality percentage Coke particle diameter / mm Quality percentage 20.5 6.84％ 80 20.72％ 14.25 74.84％ 50 52.31％ 11.25 18.32％ 32.5 26.97％

[0070] Table 1-3 Parameters of pellets and coke in numerical simulation

[0071] parameter Pellet Ore coke wall l Poisson's ratio 0.25 0.22 0.30 density <![CDATA[3015kg / m 3 ]]> <![CDATA[934kg / m 3 ]]> <![CDATA[7850kg / m 3 ]]> Young's modulus <![CDATA[3.5×10 7 Well]]> <![CDATA[5.4×10 6 Well]]> <![CDATA[7.5×10 10 Well]]>

[0072] parameter Pelletized ore / Pelletized ore Pellet / wall Coke / coke Coke / wall coefficient of recovery 0.30 0.54 0.35 0.5 static friction coefficient 0.25 0.48 0.87 0.71 coefficient of kinetic friction 0.02 0.06 0.15 0.31

[0073] like Figure 16 As shown, the circumferential direction of the furnace throat is divided into the first region, the second region, the third region, the fourth region, the fifth region, the sixth region, the seventh region, the eighth region, the ninth region, the tenth region, the eleventh region, and the second region according to the numbers 1-12.

[0074] The following are the numerical simulation results of eleven charge distribution cycles under the following conditions: pellets are discharged from the outlet on the right side of the hopper; the chute is rotated counterclockwise along the blast furnace centerline from a top-down view; the inclination angle of the chute to the vertical plane is 40°; and the distance from the chute suspension point to the charge surface at the furnace throat is 1.5m.

[0075] like Figures 17 to 18 The distribution of pellets at the end of the central throat is shown. In a conventional feeding funnel, the center of the pellet flow is 271.55 mm from the blast furnace centerline. In the feeding funnel of this invention, the center of the pellet flow is 56.34 mm from the blast furnace centerline. The measurement results show that, compared with a conventional funnel, the center of the pellet flow in the feeding funnel of this invention has moved 215.21 mm towards the blast furnace centerline. This can effectively improve the extreme value of the landing point trajectory of the furnace charge on the chute surface, thereby improving the landing point and quality segregation of the pellets at the furnace throat.

[0076] The pressure of the pellet feed flow on the central throat is as follows Figures 19 to 20 As shown, the greater the pressure of the pellet feed flow on the central throat, the greater the erosion of the central throat by the pellet feed flow, and the more severe the wear of the central throat. A comparison shows that the average pressure of pellets on the central throat in a conventional feeding funnel is 350N, while the average pressure in the feeding funnel of this invention is 0.5N. The feeding funnel of this invention can effectively prevent the furnace charge from eroding and wearing the central throat, extending the service life of the central throat.

[0077] When the cloth reaches eleventh rotation, the quality and distribution of pellets in each region are as follows: Figures 21 to 24 As shown, the mass distribution of pellets in different regions of the furnace throat in a conventional feeding hopper varies significantly, with a maximum value appearing in the seventh region. The mass of pellets in the seventh region is 248.49 kg higher than the average mass of all regions. The feeding hopper of this invention exhibits a more uniform mass distribution of furnace charge in all regions, with a maximum value appearing in the fourth region. The mass of pellets in the fourth region is 59.45 kg higher than the average mass of all regions, significantly improving the mass segregation of pellets exiting the furnace throat circumference. The average mass of pellets in each region after eleven rounds of feeding in a conventional feeding hopper is 1927.24 kg, while the average mass of pellets in each region after eleven rounds of feeding in the feeding hopper of this invention is 1874.28 kg, a reduction of 52.96 kg compared to the conventional feeding hopper, representing a 2.7% decrease. Therefore, the influence of the baffle on the feeding rate is negligible.

[0078] The mass distribution of pellets in each region around the furnace throat is as follows: Figures 25 to 26 As shown, in a conventional feeding hopper furnace, the mass distribution of pellets in the circumferential region of the throat exhibits large extreme values, with a maximum value appearing in region seven and a minimum value in region two. In the feeding hopper of this invention, the mass distribution in each region is more uniform, with no obvious regions of maximum or minimum values.

[0079] like Figure 27 As shown, with the increase in the number of feeding rings, the standard deviation of the circumferential quality of the pellets in the furnace throat of both the ordinary feeding hopper and the feeding hopper of the present invention increases. A comparison shows that the standard deviation of the circumferential quality of the pellets in the furnace throat of the ordinary feeding hopper increases faster, reaching 167.25 in the eleventh ring. In the feeding hopper of the present invention, the standard deviation of the circumferential quality of the pellets in the furnace throat of the eleventh ring is 29.57, a decrease of 82.3% compared to the ordinary feeding hopper. The standard deviation of the circumferential quality of the pellets in the furnace throat of the ordinary feeding hopper is higher than that of the feeding hopper of the present invention. The average standard deviation of the circumferential quality of the pellets in the furnace throat per ring of the ordinary feeding hopper from the first to the eleventh ring is 15.711. The average standard deviation of the circumferential quality of the pellets in the furnace throat per ring of the feeding hopper of the present invention from the first to the eleventh ring is 4.575, a decrease of 70.9% compared to the original feeding device.

[0080] The following are the numerical simulation results of the 12-cycle charging conditions, with coke discharged from the outlet on the right side of the hopper, the chute rotated counterclockwise along the center line of the blast furnace from a top-down view, the chute at an angle of 40° to the vertical plane, and the distance from the chute suspension point to the furnace throat surface being 1.5m:

[0081] The distribution of coke at the end of the central throat is as follows: Figures 28 to 29 As shown, the center of the coke flow in the ordinary feeding hopper is 224.25 mm from the blast furnace centerline. In the feeding hopper of the present invention, the center of the coke flow is 31.09 mm from the blast furnace centerline. The measurement results show that the center of the coke flow in the feeding hopper of the present invention has moved 193.16 mm towards the blast furnace centerline, which can effectively improve the extreme value of the landing point trajectory of the furnace charge on the chute, thereby improving the landing point segregation and quality segregation of coke at the furnace throat.

[0082] The pressure and mass distribution of the coke feed flow on the central throat are as follows: Figures 30 to 33 As shown, the greater the pressure of the coke flow on the central throat, the greater the erosion of the central throat and the more severe the wear. A comparison shows that the pressure of coke on the central throat in a conventional feeding funnel is 2.5 N, while the pressure in the feeding funnel of this invention is only 0.1 N. The feeding funnel of this invention effectively avoids the erosion and wear of the central throat by coke, extending the service life of the central throat.

[0083] When the cloth has been rolled twelve times, the quality of coke in each area is as follows: Figures 34 to 35 As shown, the coke mass distribution varies significantly across different regions of the throat in a conventional feeding hopper, with a maximum value observed in the seventh region, where the coke mass is 220.61 kg higher than the average mass across all regions. In contrast, the feeding hopper of this invention exhibits a more uniform coke mass distribution across all regions, with a maximum value observed in the fifth region, where the coke mass is 108.19 kg higher than the average mass across all regions. Compared to the conventional feeding hopper, the coke mass distribution across all regions is more uniform. The average mass of coke in each region after 12 cycles of feeding in a conventional feeding hopper is 1259.86 kg, while the average mass in each region after 12 cycles of feeding in the feeding hopper of this invention is 1242.21 kg, a reduction of 17.56 kg compared to the conventional feeding hopper, representing a 1.4% decrease. Therefore, the influence of the baffle on the feeding rate is negligible.

[0084] The mass distribution of coke in each area of ​​the furnace throat circumference is as follows: Figures 36 to 37 As shown, in a conventional feeding hopper furnace, the coke mass distribution in the circumferential region of the throat exhibits large extreme values, with a maximum value in region seven and a minimum value in region two. In contrast, the feeding hopper of this invention provides a more uniform coke mass distribution across all regions, without distinct maximum and minimum value regions.

[0085] like Figure 38 As shown, with the increase in the number of feeding rings, the standard deviation of coke quality in the circumferential direction of the furnace throat increases in both the conventional feeding funnel and the feeding funnel of the present invention. A comparison reveals that the standard deviation of coke quality in the circumferential direction of the furnace throat increases more rapidly in the conventional feeding funnel, reaching 101.94 in the twelfth ring. In contrast, the standard deviation of the feeding funnel of the present invention in the twelfth ring is 53.20, a decrease of 47.8% compared to the conventional feeding funnel. The average standard deviation of coke quality in the circumferential direction of the furnace throat in the conventional feeding funnel from the first to the twelfth ring is 10.966. In contrast, the average standard deviation of coke quality in the circumferential direction of the furnace throat in the feeding funnel of the present invention in the first and twelfth rings is 7.199, a decrease of 34.4% compared to the conventional feeding funnel.

Claims

1. A feeding hopper for improving the distribution segregation of charge in a blast furnace, comprising a box body, a collecting pipe, and a guiding pipe. The upper end of the box body is connected to the lower end of the charge outlet of the charge tank. The charge tank and the box body are symmetrical about the center line of the blast furnace. The bottom of the box body is connected to multiple collecting pipes. The outlet of each collecting pipe is connected to the inlet of the guiding pipe. The guiding pipes are symmetrically distributed about the center line of the blast furnace, and the outlets of the multiple guiding pipes intersect. A left baffle and a right baffle are installed inside the box body. The left baffle and the right baffle are symmetrically arranged on both sides of the upper end of the box body. A throttling valve and a sealing valve are sequentially arranged from top to bottom in the charge outlet of the charge tank.

2. The feeding hopper for improving the segregation of charge distribution in a blast furnace according to claim 1, characterized in that, One end of the left and right baffles is fixed to the side wall of the box. The left and right baffles can be freely adjusted in tilt angle. When the left and right baffles are working, the angle between them and the upper horizontal plane of the box is 20° to 70°.

3. The feeding hopper for improving the distribution segregation of charge in a blast furnace according to claim 1, characterized in that, The ratio of the vertical distance between the upper end of the left baffle and the upper end of the box to the diameter of the material tank outlet is 0.1 to 1, and the ratio of the vertical distance between the upper end of the right baffle and the upper end of the box to the diameter of the material tank outlet is 0.1 to 1.

4. The feeding hopper for improving the segregation of charge distribution in a blast furnace according to claim 1, characterized in that, The left and right baffles are identical in shape and size. The ratio of the long side of the left baffle to the diameter of the discharge port of the material tank is 1 to 2.5, and the ratio of the short side of the left baffle to the diameter of the discharge port of the material tank is 0.2 to 0.

8.

5. A charging hopper for improving charge distribution segregation in a blast furnace according to claim 1, characterized in that, The ratio of the area of ​​the feed inlet of the feed pipe to the area of ​​the discharge outlet of the material tank is 0.6-1.

5.

6. The feeding hopper for improving the distribution segregation of a blast furnace according to claim 1, characterized in that, The ratio of the vertical distance from the center of the feed pipe inlet to the center line of the blast furnace to the diameter of the feed tank outlet is 0.6 to 1.

5.

7. A charging hopper for improving charge distribution segregation in a blast furnace according to claim 1, characterized in that, The ratio of the area of ​​the discharge port of the feed pipe to the area of ​​the discharge port of the material tank is 0.5 to 1.

8. A charging hopper for improving charge distribution segregation in a blast furnace according to claim 1, characterized in that, The ratio of the vertical distance from the center of the feed pipe outlet to the blast furnace centerline to the diameter of the feed tank outlet is 0.2 to 0.

8.

9. A feeding method using a feeding hopper for improving the distribution segregation of charge in a blast furnace as described in claim 3, characterized in that, Includes the following steps: The furnace charge is loaded into the charging hopper using a conveyor belt. The upper sealing valve is closed, and the charging hopper is pressurized. The hopper is then ready to be charged into the blast furnace. When the charging signal is received and the charging hopper outlet is above the left baffle, the angle between the left baffle and the horizontal plane is adjusted. The angle between the left baffle and the upper horizontal plane of the box is 20° to 70°. The right baffle is perpendicular to the upper horizontal plane of the box. The lower sealing valve and the throttle valve are opened in sequence. At this time, the furnace charge with a certain initial velocity flows out of the charging hopper outlet first. The furnace charge continues to fall and first contacts the left baffle in the box. The width of the left baffle is smaller than the width of the material flow. The left baffle transfers 0.4-0.6 times the volume of the furnace charge to the collecting pipe below the right baffle. A charge of 0.4-0.6 times its volume falls naturally into the collecting pipe below the left baffle. The charge in the collecting pipe then falls into the guide pipe connected to the outlet of the collecting pipe. The guide pipes are symmetrically distributed about the blast furnace centerline. The charge passing through the guide pipes collides and aggregates at the blast furnace centerline, forming a new flow. The charge then descends through the central throat into the chute, and finally, the chute delivers the charge into the blast furnace, completing the charging process for one charge hopper. When a charging signal is received and the open charge hopper outlet is above the right baffle, adjustments are made... Adjust the angle between the left baffle and the upper horizontal plane of the box, and adjust the angle between the right baffle and the horizontal plane. The angle between the right baffle and the upper horizontal plane of the box is 20° to 70°. The left baffle is perpendicular to the upper horizontal plane of the box. Open the lower sealing valve and the throttle valve in sequence. At this time, the furnace charge with a certain initial velocity flows out from the discharge port of the charge tank. The furnace charge continues to fall and first contacts the right baffle in the box. The width of the right baffle is smaller than the width of the material flow. The right baffle transfers 0.4-0.6 times the volume of the furnace charge to the collecting pipe below the left baffle. A 0.4-0.6 times volume of furnace charge falls naturally into the collecting pipe below the right baffle. The furnace charge in the collecting pipe falls into the guide pipe connected to the outlet of the collecting pipe. The furnace charge collides and aggregates with each other at the center line of the blast furnace, forming a new flow of charge. The furnace charge descends into the chute through the central throat pipe, and finally the chute sends the furnace charge into the blast furnace, completing the charging process of another charge hopper.

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