CN116814880A - A kind of rectifier blast furnace central guide tube - Google Patents

Abstract

This application discloses a rectified blast furnace central guide tube, which includes a guide tube body with a central guide hole. The upper end of the guide tube body is provided with an inlet funnel connected to the central guide hole. Between the inlet funnel and the guide material A diverter device is provided at the junction of the tube bodies for diverting the charge and buffering the material flow. The upper end of the central guide hole has a circular opening, and from top to bottom there is a slope centering device facing the internal bulge. The use of this device can reduce the eccentric influence of the parallel-tank blast furnace material flow in the feed tube, thereby improving the uniformity of the circumferential direction in the blast furnace distribution furnace, and making the eccentric circle of the material flow drop point more perfect, thereby achieving the goal of achieving the ore in the furnace. The uniform controllability of the coke ratio creates conditions for the implementation of processes that achieve reasonable gas flow distribution, improve blast furnace gas utilization, and increase production efficiency.

Description

A kind of rectifier blast furnace central guide tube

Technical field

The present application relates to the technical field of furnace diversion equipment, and in particular to a rectifying blast furnace central guide tube.

Background technique

Parallel tank bellless blast furnace distributor usually consists of two parallel tanks 1. As shown in Figure 1 of the instruction manual, the chute 3 is fed alternately through the central guide tube 2. The charge 4 is discharged from the tank 1 along the central guide. The material pipe 2 flows into the rotating chute 3, and the charge 4 falls onto the material surface in the furnace while rotating with the chute 3.

However, in the current research on the distribution of bell-less blast furnaces with parallel tanks, it has been found that the charge 4 will deflect along one side of the upper edge of the central guide tube 2 during the unloading process of the central feed tube 2, causing the charge to be discharged at the furnace throat. The thickness distribution on the circumference is uneven. For details, please refer to Figure 1 of the manual. When the charge 4 is deflected in the direction corresponding to the exit, the material flow speed at the outlet of chute 3 is fast, the material is dropped more, the material layer is thicker, and the corresponding material drop point is far away in the radial direction. When the charge 4 is deflected corresponding to the opposite direction of the exit, the outlet of chute 3 If the material flow speed is slow, the material will fall less and the material layer will be thin. The corresponding material falling points will be close in the radial direction, causing the material falling point in the furnace to be seriously deviated from the center and form an asymmetrically deformed round shape. The details are shown in Figure 2 of the manual, labeled 5 represents the distribution trajectory after the charge is deviated, which ultimately leads to the uneven amount of charge on the circumference of the combined tank and the uneven circumferential eccentricity.

Generally speaking, one of the two parallel tanks 1 is filled with coke and the other is filled with mineral material. This results in an eccentric thick layer of coke corresponding to a thin layer of mineral material, and a thin layer of coke corresponding to a thick layer of mineral material, which has a negative impact on production efficiency and gas production. The utilization rate has a great negative impact. The uneven distribution of gas flow in the circumferential direction of the blast furnace will cause the center gas flow to shift and the edge gas flow to be uneven. In severe cases, it will cause the blast furnace to stick or edge pipes, affecting the smooth operation of the blast furnace.

In the Chinese utility model patent with application number 201120080564.2, a feeding tube is disclosed, which is provided with multiple crescent-shaped baffles on the inner wall of the inner tube. The baffles block the path of the material flow, thus changing the path of the material flow. The overall flow is offset from the center of the feed tube. However, for this utility model, the function of the baffle can only be used to buffer and divert the flow, and will not affect the flow direction of the material flow, that is, it cannot provide the initial velocity for the material flow to move toward the center of the guide tube. The flow still falls by its own gravity, so its rectification effect is not good.

Therefore, in view of the above technical problems, how to avoid the uneven distribution of materials in the furnace on the circumference caused by blanking deviation is a technical problem that technicians need to solve.

Contents of the invention

The purpose of this application is to provide a rectified blast furnace central guide tube, which rectifies through a diverter device and a central guide hole slope centering device to reduce the eccentric influence of the parallel tank blast furnace material flow in the guide tube. To improve the uniformity of blast furnace cloth and furnace circumferential direction.

In order to achieve the above object, the present application provides a rectified blast furnace central feed pipe, which includes a feed pipe body with a central guide hole, and an inlet connected to the central guide hole is provided at the upper end of the guide pipe body. Funnel, a diverting device for diverting and buffering the charge is provided at the junction of the inlet funnel and the guide tube body, and the upper end of the central guide hole has a circular opening, and has a circular opening from top to bottom. Slope centering device facing its internal bulge.

Preferably, the number of the diverting devices is two, and they are symmetrically arranged at the intersection between the inlet funnel and the guide tube body. The distance between the ends of the two diverting devices is smaller than the upper end circle of the guide tube body. The diameter of the shaped opening.

Preferably, the flow diverting device is a truncated cone structure with a truncated cone hole in the middle, and the diameter of the bottom of the truncated cone hole is equal to and corresponding to the diameter of the circular opening at the upper end of the central guide hole.

Preferably, the central guide hole gradually becomes an elliptical opening at the lower end from top to bottom, and the radius of the circular opening at the upper end is greater than the length of the minor axis of the elliptical opening.

Preferably, the center of the circular opening and the center of the oval opening are located on the same vertical axis.

Preferably, the major axis of the elliptical opening is equal to the radius of the circular opening.

Preferably, the two short axes of the elliptical opening correspond to the positions of the diverting device respectively.

Preferably, the central guide hole is a truncated cone-shaped structure with a circular opening at the lower end, and the radius of the circular opening at the upper end is greater than the radius of the circular opening at the lower end.

Preferably, the centers of the two circular openings are located on the same vertical axis.

Compared with the above-mentioned background technology, this application utilizes a diverting device so that when the raw materials enter the guide tube body, they do not all flow down eccentrically in the opposite direction, but split into the guide tube body to reduce the eccentricity of the material flow; at the same time, there is a central guide hole inside The raised slope centering device guides the material flow to the center of the bottom of the central guide hole to further correct the eccentric material flow. Thereby reducing the eccentric influence of the material flow of the parallel tank blast furnace in the feed tube, improving the uniformity of the blast furnace cloth and the circumferential direction of the furnace, and achieving a more perfect eccentric circle of the material flow falling point, thereby achieving the ore-to-coke ratio in the furnace. The uniform controllability creates conditions for the implementation of processes that achieve reasonable gas flow distribution, improve blast furnace gas utilization, and increase production efficiency.

Description of the drawings

In order to explain the embodiments of the present application or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only This is an embodiment of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without exerting creative efforts.

Figure 1 is a schematic diagram of the structure of material flow deviation and uneven distribution in the prior art;

Figure 2 is a schematic diagram of the material flow in the prior art and the distribution trajectory of the material flow in this application;

Figure 3 is a schematic structural diagram of the diverter device provided by the embodiment of the present application as two symmetrically arranged plate structures and an elliptical opening at the bottom of the central hole;

Figure 4 is a schematic diagram of the structure in direction A in Figure 3;

FIG. 5 is a schematic structural diagram of the diverter device provided by the embodiment of the present application, which has a truncated cone structure and the bottom of the central hole is a circular opening.

In the picture: 1-material tank, 2-central guide tube, 3-chute, 4-furnace material, 5-deviated distribution track, 6-rectified distribution track, 7-guide tube body, 8-central guide hole, 9-inlet funnel, 10-splitting device.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

It should be noted that in this embodiment, the orientations or positional relationships indicated by "upper", "lower", "front", "back", etc. are based on the orientations or positional relationships shown in the drawings, and are only for convenience of description. This application and simplified description are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation on the application. In addition, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In order to enable those skilled in the art to better understand the solution of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIGS. 3 to 5 , in this embodiment, a rectified blast furnace center feed pipe is provided, including a feed pipe body 7 with a central guide hole 8 , and the feed pipe body 7 serves as the main part of the charge 4 In the feed channel, the charge 4 is discharged into the central guide hole 8 through the material tank 1, and then rectified by the central guide hole 8 and then discharged into the furnace.

Please refer to Figure 3. An inlet funnel 9 is provided at the upper end of the feed tube body 7. The inlet funnel 9 has a truncated cone-shaped structure and is used to increase the feeding area of the central guide hole 8 to facilitate the discharge of the furnace charge 4. The inlet funnel 9 The lower end is connected to the upper end of the feed pipe body 7. At the same time, a diverter device 10 is provided at the connection between the inlet funnel 9 and the feed pipe body 7. The diverter device 10 can play a certain buffering role and prevent all the charge 4 from flowing down eccentrically in the opposite direction; Specifically, since the two material tanks 1 are respectively located on both sides of the feed tube body 7, the discharge port usually has a certain inclination when discharging materials, as shown in Figure 1. In this case, if the diverter device 10 is not provided , the charge 4 will move toward the side wall on the other side of the central guide hole 8 under the action of gravity and the inclined discharge port. Only when it reaches the side wall on the other side can it move downward along the side wall by its own gravity. This will cause the charge 4 to be mostly located at the side wall and cannot be evenly distributed in the central guide hole 8 .

However, the setting of the splitting device 10 can, on the one hand, evenly distribute the charge 4 and avoid the situation that all the charge 4 flows eccentrically in the opposite direction. On the other hand, it can buffer the initial speed of the charge 4 and prevent the charge 4 from being washed away from the central guide hole side for a long time. wall wear.

In addition, the upper end of the above-mentioned central guide hole 8 has a circular opening, which facilitates the entry of the charge 4 and can also play a role in circumferentially distributing the charge 4. The central guide hole 8 has a slope centering device facing the internal bulge from top to bottom; here The slope centering device refers to a device that achieves the purpose of centering under the action of the inclined surface of the slope.

That is to say, the interior of the central guide hole 8 is arranged in a way that it is wide at the top and narrow at the bottom. That is, after the charge 4 enters the central guide hole 8, under the action of the centering device, the charge 4 can make a certain tilt movement along with the slope. Therefore, when moving by its own gravity, it has an initial velocity in the horizontal direction. When the charge 4 breaks away from the central guide hole 8, it can continue to flow to the central axis of the guide tube body 7 by relying on this horizontal speed, which can control the eccentric material flow. Further correction and rectification.

It should be noted that for the above-mentioned raised slope centering device, at any longitudinal section of the slope, it gradually moves closer to the central axis of the feed tube body 7 from top to bottom, and the cross-section line of the slope is a smooth inclined line. Specifically, Please refer to Figure 3.

Based on the above embodiments, this application uses the diverter device 10 so that when the charge 4 enters the feed tube body 7, it does not all flow down eccentrically in the opposite direction, but flows into the feed tube body 7 separately, reducing the eccentricity of the material flow; at the same time, the center guides the flow There is a raised slope centering device inside the hole 8, and the material flow is directed to the center of the bottom of the central guide hole 8 to further correct the eccentric material flow. Thereby reducing the eccentric influence of the material flow of the parallel tank blast furnace in the feed tube, improving the uniformity of the blast furnace cloth and the circumferential direction of the furnace, and achieving a more perfect eccentric circle of the material flow falling point, thereby achieving the ore-to-coke ratio in the furnace. The uniform controllability creates conditions for the implementation of processes that achieve reasonable gas flow distribution, improve blast furnace gas utilization, and increase production efficiency.

In addition, the above-mentioned flow diverting device 10 can be arranged in a variety of ways. In this embodiment, the baffle type and the circular table type are introduced, as shown in Figures 3 and 4. The diverting device 10 is a baffle type. The number 10 is two, corresponding to the two material tanks 1 respectively. The two diverting devices 10 are symmetrically arranged at the intersection of the inlet funnel 9 and the guide tube body 7; when the material tank 1 on the left is unloading, the material tank 1 on the left is discharging. The side diverting device 10 can buffer the charge 4. Under the buffering of the diverting device 10, the charge 4 can overflow on both sides or the top of the diverting device 10, thereby flowing into the central guide hole 8, and relying on the central guide hole 8. The internal slope centering device further rectifies the charge 4 so that the charge 4 can be discharged uniformly.

In order to prevent the charge 4 from having a horizontal initial velocity when entering the central guide hole 8, the distance between the ends of the two diverting devices 10 here is smaller than the diameter of the circular opening at the upper end of the guide tube body 7; that is to say, when the charge 4 When overflowing from the bottom of the two diverting devices 10, the charge 4 can directly make a free fall movement in the central guide hole 8 until the movement reaches a certain extent and then contact the side wall of the central guide hole 8, and then from the side of the central guide hole 8 The wall provides it with a horizontal initial velocity and keeps it close to the side wall movement of the central guide hole 8, which can also achieve the rectifying effect of the above-mentioned slope centering device.

If the distance between the ends of the two diverting devices 10 is greater than the diameter of the circular opening at the upper end of the feed tube body 7, and on the premise that the two diverting devices 10 are arranged at the junction of the inlet funnel 9 and the feed tube body 7, then the furnace charge After 4 overflows from the diverter device 10, it may move tilted along the outer wall of the diverter device 10, and at this time it will also have a horizontal initial velocity; when the charge 4 enters the central guide hole 8 from the diverter device 10, at the above level Under the action of the initial velocity, the charge 4 may also come into contact with the side wall of the central guide hole 8 on the other side, thus achieving the technical problem mentioned in the prior art.

Of course, it is also possible to use a truncated cone-type diverter device 10. As shown in Figure 5, the diverter device 10 is a truncated cone structure with a truncated cone hole in the middle. The diameter of the bottom of the truncated cone hole is equal to and corresponding to the diameter of the circular opening at the upper end of the central guide hole 8. . That is to say, the truncated cone-shaped diverter device 10 has a truncated cone shape on the outside and a truncated cone shape on the inside. The outer truncated cone shape can buffer the initial velocity of the charge 4 entering the central guide hole 8. When the charge 4 is fully loaded between the inlet funnel 9 and the diverter device 10 When the time is up, the charge 4 will overflow from the top of the diverter device 10 and fall into the central guide hole 8, where it will be rectified by the central guide hole 8.

It should be noted that for the above-mentioned round table-type flow diverter device 10, since the diverter device 10 has completed most of the rectification work of the charge 4, the slope centering device of the lower central guide hole 8 can be set, and of course it does not need to be set. Here, it can be Choose according to actual situation.

Regarding the arrangement of the above two diverting devices 10, two different arrangements of the central diversion hole 8 are proposed here, specifically the arrangement of the upper circular opening and the lower elliptical opening, and the arrangement of both the upper and lower circular openings. Cone-shaped setting.

The above two different ways of setting the centering device of the central guide hole 8 are applicable to two different types of diverting devices 10. Taking the arrangement of the upper circular opening and the lower elliptical opening as an example, the central guide hole 8 is in the above-mentioned configuration. On the premise of a circular opening, it gradually changes from top to bottom to an elliptical opening at the lower end, and the radius of the circular opening at the upper end is greater than the length of the minor axis of the elliptical opening. That is to say, in the minor axis direction, the central guide hole 8 The lower part is still configured to shrink, that is, it forms an inclined slope at a certain angle to complete the rectification of the charge 4.

At the same time, the center of the circular opening and the center of the elliptical opening are located on the same vertical axis, preventing the two from deviating and preventing the rectified charge 4 from being eccentric again when it falls into the furnace.

It should be noted that when using the baffle type diverter device 10, the short axis of the oval opening needs to correspond to the position of the two diverter devices 10, so that the charge 4 overflowing from the diverter device 10 can fall into the space formed by the short axis and the center opening. Within the slope, the charge 4 can be rectified.

Since the radius of the major axis of the elliptical opening has a smaller effect on the rectification effect regardless of whether the baffle-type or truncated table-type flow diverter 10 is used, the major axis of the elliptical opening can be set equal to the radius of the circular opening, or can be larger or slightly larger than the radius of the circular opening. Less than, without too many restrictions here, all fall within the protection scope of this application.

When using a truncated cone-shaped arrangement with circular openings at the upper and lower parts, the central guide hole 8 also has a truncated cone-shaped structure as a whole, and the radius of the circular opening at the upper end is greater than the radius of the circular opening at the lower end, so that the central guide hole 8 The side walls also form an inclined slope. Of course, the lower circular opening here is also a special case of the elliptical opening. When the long axis and the short axis of the elliptical opening are equal, it becomes this arrangement. Similarly, the centers of the two circular openings are located on the same vertical axis to avoid rectification eccentricity.

According to the on-site distribution measurement of a ^4000m3 parallel tank blast furnace, taking mineral materials as an example, when the distribution angle is 42 degrees, the unevenness of the distribution on the circumference is about 10%, and the circumferential eccentricity is about 300mm, as shown in Figure 2. The cloth trajectory is shown in 5; with the central guide tube of this application, the unevenness of the cloth on the circumference at the same angle is reduced from 10% to about 6%; the circumferential eccentricity is reduced from about 300mm to about 180mm, as shown in Figure 2. As shown in the cloth track 6 below, the uniformity in the circumferential direction is significantly improved and the eccentricity is significantly reduced.

It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply the existence of any such relationship between these entities. Actual relationship or sequence.

This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application. It should be noted that for those of ordinary skill in the art, several improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims (9)

1. A rectified blast furnace center feed pipe, including a feed pipe body with a central guide hole, and an inlet funnel connected to the central guide hole is provided at the upper end of the feed pipe body, characterized in that, The junction between the inlet funnel and the guide tube body is provided with a diverting device for diverting the charge and buffering the material flow, and the upper end of the central guide hole has a circular opening, and from top to bottom has a bulge facing its interior. Slope centering device. 2. The rectified blast furnace center feed pipe according to claim 1, characterized in that the number of the diverting devices is two, and they are symmetrically arranged at the intersection of the inlet funnel and the feed pipe body. The distance between the two ends of the diverter device is smaller than the diameter of the circular opening at the upper end of the guide tube body. 3. The rectified blast furnace center guide tube according to claim 1, characterized in that the flow diverter is a truncated cone structure with a truncated cone hole in the middle, and the diameter of the bottom of the truncated cone hole is the same as that of the upper end of the central guide hole. The openings have equal diameters and corresponding positions. 4. The rectified blast furnace central guide tube according to claim 2 or 3, characterized in that the central guide hole gradually changes from top to bottom to an oval opening at the lower end, and the radius of the circular opening at the upper end is larger than the oval opening. The length of the opening minor axis. 5. The rectified blast furnace central feed tube according to claim 4, characterized in that the center of the circular opening and the center of the oval opening are located on the same vertical axis. 6. The rectified blast furnace center feed tube according to claim 5, characterized in that the long axis of the oval opening is equal to the radius of the circular opening. 7. The rectified blast furnace central feed tube according to claim 6, characterized in that the two short axes of the oval opening correspond to the positions of the diverting device respectively. 8. The rectified blast furnace central guide tube according to claim 2 or 3, characterized in that the central guide hole is a truncated cone-shaped structure with a circular opening at the lower end, and the circular opening radius at the upper end is larger than that at the lower end. The radius of the circular opening. 9. The rectified blast furnace central feed tube according to claim 8, characterized in that the centers of the two circular openings are located on the same vertical axis.