Blast furnace burden surface distribution monitoring system and method

Abstract

The invention discloses a blast furnace burden surface distribution monitoring system which comprises a central throat pipe, a chute, two scanning devices and a processing controller. One scanning device is arranged on the side wall of the front end of the discharging end of the chute in the movement direction, the other scanning device is arranged on the side wall of the rear end of the discharging end of the chute in the movement direction, and the scanning device on the side wall of the front end scans and obtains blast furnace charge level data before discharging of the chute; scanning equipment on the side wall of the rear end scans to obtain blast furnace charge level data after discharging of the chute; the processing controller is connected with the material tank material flow valve, the chute and the two scanning devices, and the processor obtains the state of each layer of the blast furnace material level according to the scanning results of the two scanning devices and controls the discharging speed of the material tank material flow valve and the material distribution angle of the chute according to the scanning results. According to the method, furnace charge segregation caused by variable factors such as initial material level deviation, material distribution time deviation, equipment deviation and furnace charge change can be effectively relieved, the material surface shape is improved and optimized, and an important guarantee effect is provided.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace material surface distribution monitoring, and in particular to a blast furnace material surface distribution monitoring system and method. Background Art

[0002] Burden operation is one of the four basic operation systems of blast furnace ironmaking, which directly affects the distribution and utilization rate of blast furnace gas. Adjusting the burden distribution system by adjusting the upper part of the blast furnace, changing the distribution characteristics of the burden, and improving the utilization rate of the gas are of great significance for the high production, low consumption and stable operation of the blast furnace.

[0003] In order to achieve accurate distribution control of blast furnace charge, it is necessary to understand the placement and distribution characteristics of charge during the charging process. Due to the closed environment of the blast furnace, it is difficult to visually observe the distribution characteristics of the charge surface and the placement of the charge during the charging process. In addition, the existing blast furnace charge surface detection equipment and charge surface scanning equipment are difficult to detect the placement and distribution law of the charge during the charging process. As the charge falls from the chute and contacts the charge surface, it is bound to collide and roll, which makes the charge surface distribution more complicated. It is also difficult to reflect the charge surface situation in real time through theoretical calculations and numerical simulations. The timing of the existing charging system is often confirmed by the blast furnace operator through subjective judgment of blast furnace parameters and other information. Therefore, there will inevitably be deviations in the position of the charge surface each time. If the original charging mode is still adopted, it will inevitably lead to charge segregation. The charge segregation is particularly prominent in large blast furnaces.

[0004] The Chinese patent with the patent number "201710003901X" is "A method and system for optimizing the distribution matrix in the blast furnace distribution process". By setting the ideal material surface shape; optimizing the distribution matrix with the goal of minimizing the deviation between the material surface shape of the next batch of furnace charges and the ideal material surface shape; the optimal distribution matrix obtained by optimization is used as the distribution matrix of the next batch of furnace charges. This patent mainly uses theoretical calculations. In the face of the relatively complex shape of the material surface in the blast furnace, and the physical phenomena such as rolling, collision, and sliding of the furnace charge when it reaches the material surface, it is difficult to accurately determine the landing point through theoretical calculations.

[0005] The Chinese patent with the patent number "2024106309525" is "A method for evaluating the uniformity of blast furnace smelting speed based on blast furnace charge surface scanning". The blast furnace smelting speed is evaluated and controlled by scanning to obtain the state of the blast furnace charge surface. Although this patent uses a scanning method to obtain the state of the blast furnace charge surface, the scanning device used for scanning is set on the blast furnace wall for fixed-point measurement. It can only scan once before laying, and then scan again after the current layer of laying is completed. It is impossible to scan during the current layer of laying, and it is difficult to obtain the state of the blast furnace charge surface in real time.

[0006] In summary, the existing patents for charge distribution detection and other patents are difficult to monitor the charge surface conditions in the charge distribution process in real time, and it is difficult to adjust the charge distribution of the blast furnace by monitoring the charge surface conditions and charge placement in real time. The existing series of inventions for charge distribution theory calculation and model are difficult to restore the precise placement of the charge, and the change of the charge surface in the blast furnace will also bring certain difficulties to the theoretical calculation. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a blast furnace charge surface distribution monitoring system and method to solve the technical problem that the prior art cannot monitor the real-time status of the blast furnace charge surface.

[0008] The present invention provides a blast furnace material surface distribution monitoring system, comprising: a central throat pipe, a chute, two scanning devices, and a processing controller; the central throat pipe is vertically arranged on the top of the blast furnace, and one end is aligned with the outlet of the material flow valve of the material tank; the chute is inclined, and one end is fixed to the other end of the central throat pipe as a feeding end, and the chute rotates around the central throat pipe and adjusts the distribution angle; one scanning device is arranged on the side wall of the discharge end of the chute along the front end of the movement direction, and the other scanning device is arranged on the side wall of the discharge end of the chute along the rear end of the movement direction, the scanning device on the front side wall scans and obtains the blast furnace material surface data before the chute discharges, and the scanning device on the rear side wall scans and obtains the blast furnace material surface data after the chute discharges; the processing controller is connected to the material tank material flow valve, the chute and the two scanning devices, and the processor obtains the state of each layer of the blast furnace material surface according to the scanning results of the two scanning devices, and controls the unloading speed of the material tank material flow valve and the distribution angle of the chute according to the scanning results.

[0009] Furthermore, the scanning device is a laser scanner.

[0010] The present invention also provides a blast furnace charge surface distribution monitoring method, comprising:

[0011] After the chute rotates one circle, the blast furnace charge surface data scanned by the scanning devices on the front end side wall and the rear end side wall are obtained respectively. The charge surface height along the radial direction of the blast furnace charge surface at the current position after one circle of charge distribution is obtained according to the charge surface data of the front and rear ends. The overall charge surface height along the radial direction of the blast furnace charge surface at the current position is obtained according to the acquired charge surface height of each circle.

[0012] The present invention also provides a blast furnace charge surface distribution monitoring method, comprising:

[0013] Several monitoring points are set on the rotating circle of the chute. When the chute rotates to the monitoring points, the blast furnace material surface data scanned by the scanning equipment on the front side wall and the scanning equipment on the rear side wall are respectively obtained. The material distribution height along the radial direction of the blast furnace material surface at the current monitoring point position in the circle is obtained according to the blast furnace material surface data at the front and rear ends. The overall material distribution height of the blast furnace material surface is obtained according to the obtained material distribution height of each monitoring point in the circle.

[0014] Furthermore, the method for obtaining the radial distribution height of the blast furnace charge surface is:

[0015] Construct a material distribution height coordinate system, in which the horizontal axis is the distance from the blast furnace radial direction to the blast furnace center; the vertical axis is the distance from the zero material line in height, and the material surface data of the front and rear ends of the blast furnace are plotted in the height coordinate system. The area enclosed by the two curves can reflect the spatial shape of the material distribution at the current position. According to the spatial shape, the material distribution height at any coordinate point on the horizontal axis can be obtained.

[0016] Furthermore, the blast furnace charge surface distribution monitoring method further includes: after obtaining the charge distribution height at the current position, adjusting the inclination angle of the next circle chute at this position and / or adjusting the charge distribution speed.

[0017] Furthermore, when setting the monitoring points, it also includes dividing the material surface into several areas, and setting at least one monitoring point in each area.

[0018] Furthermore, the monitoring points are arranged at equal intervals.

[0019] Furthermore, the number of monitoring points is an even number.

[0020] Furthermore, the number of monitoring points is at least four.

[0021] Beneficial effects of the present invention:

[0022] The present invention installs two material surface scanning devices on the two sides of the blast furnace distribution chute respectively, and realizes the function of real-time distribution scanning along with the rotation of the distribution chute, which can monitor the changes of the material surface before and after the distribution in real time, accurately determine the distribution characteristics of the charge, and can adjust the blast furnace distribution in real time according to the actual distribution situation. The present invention can effectively reduce the charge segregation caused by variable factors such as initial material level deviation, distribution timing deviation, equipment deviation and charge change, improve and optimize the shape of the material surface, and provide an important guarantee for the accurate and stable distribution of the blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0024] Figure 1is a schematic diagram of the system structure of a specific embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A schematic cross-sectional view at AA;

[0026] Figure 3 is a schematic diagram of a height coordinate system in a specific embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the overall height coordinate system converted from the height coordinate system in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] The present invention is further illustrated below in conjunction with specific embodiments. Those skilled in the art should understand that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention, and modifications to various equivalent forms of the present invention all fall within the scope defined by the appended claims of this application.

[0030] like Figure 1 As shown, the present invention provides a blast furnace charge surface distribution monitoring system, comprising: a central throat pipe 2, a chute 3, two scanning devices 5, and a processing controller; the central throat pipe 2 is vertically arranged on the top of the blast furnace 1, and one end is aligned with the outlet of the material tank flow valve; the chute 3 is inclined, and one end is fixed to the other end of the central throat pipe 2 as a feeding end, and the chute 3 rotates and adjusts the distribution angle around the central throat pipe 2; one scanning device 5 is arranged on the side wall at the front end of the discharge end of the chute 3 along the movement direction, and the other scanning device 5 is arranged on the side wall at the rear end of the discharge end of the chute 3 along the movement direction, the scanning device 5 on the front side wall scans and obtains the blast furnace charge surface 4 data before the chute 3 is discharged, and the scanning device 5 on the rear side wall scans and obtains the blast furnace charge surface 4 data after the chute 3 is discharged; the processing controller is connected to the material tank flow valve, the chute 3 and the two scanning devices 5, and the processor obtains the state of each layer of the blast furnace charge surface 4 according to the scanning results of the two scanning devices 5, and controls the unloading speed of the material tank flow valve and the distribution angle of the chute 3 according to the scanning results.

[0031] When in use, the chute 3 will rotate with the central throat 2 as the axis, and the two scanning devices 5 will rotate along with the chute 3. The scanning of the scanning devices will not be affected by the rotating chute, and real-time scanning of the material surface after each layer of material is laid can be achieved. At this time, the scanning device 51 at the front end of the movement direction will scan the material surface before the charge falls, and the scanning device 52 at the rear end of the movement direction will scan the material surface after the charge falls. The results of the scanning by the two scanning devices 5 can be used to obtain the status of the material surface before and after the chute 3 is laid at any time, thereby obtaining the material surface height difference at the collection position.

[0032] The specific embodiment of the present invention also provides a blast furnace charge surface distribution monitoring method, comprising:

[0033] After the chute rotates one circle, the blast furnace charge surface data scanned by the scanning devices on the front end side wall and the rear end side wall are obtained respectively, and the charge surface height along the radial direction of the blast furnace charge surface at the current position after one circle of charge distribution is obtained according to the blast furnace charge surface data at the front and rear ends, and the overall charge surface height along the radial direction of the blast furnace charge surface at the current position is obtained according to the acquired charge surface height of each circle, wherein, after obtaining the charge surface height at the current position, the inclination angle of the chute at this position for the next circle is adjusted and / or the charge surface speed is adjusted, for example, when the landing point position is relatively deviated from the center and close to the furnace wall, the charge surface angle of the chute can be reduced to a small angle.

[0034] The specific embodiment of the present invention also provides another blast furnace charge surface distribution monitoring method, comprising:

[0035] A number of monitoring points are arranged on the rotating circle of the chute. When the chute rotates to the monitoring points, the blast furnace charge surface data scanned by the scanning devices on the front side wall and the rear side wall are obtained respectively. The charge distribution height along the radial direction of the blast furnace charge surface at the current monitoring point position in the circle is obtained according to the blast furnace charge surface data at the front and rear ends. The overall charge distribution height of the blast furnace charge surface is obtained according to the obtained charge distribution height of each monitoring point in the circle. After obtaining the charge distribution height at the current position, the inclination angle of the chute at this position of the next circle is adjusted and / or the charge distribution speed is adjusted. For example, when the landing point position is relatively deviated from the center and close to the furnace wall, the charge distribution angle of the chute can be reduced to a small angle.

[0036] In the above two specific implementation methods, the method for obtaining the charging height along the radial direction of the blast furnace charge surface is specifically as follows:

[0037] Construct a material distribution height coordinate system, in which the horizontal axis is the distance from the blast furnace radial direction to the blast furnace center; the vertical axis is the distance from the zero material line in height; taking the laser scanner as an example of the scanning equipment, the laser scanner can project a linear laser along the radial direction of the blast furnace material surface on the material surface, and through the laser reflection scanning result, the height change curve of the material surface along the radial direction of the blast furnace material surface can be known, and the height change curves of the front and rear ends are projected into the height coordinate system. The curve can reflect the height change of the material surface at the monitoring point position along the radial direction of the blast furnace material surface, and the area enclosed by any two curves can reflect the spatial shape of the material at the current position between the number of material distribution layers corresponding to the two curves. The height coordinate system is equivalent to sectioning the blast furnace material surface along the blast furnace material surface, and the material distribution height at any coordinate point on the horizontal axis can be obtained according to the spatial shape.

[0038] Since the angle of the chute will change, the height of the scanning device will also change. In the process of projecting the height change curve to the height coordinate system, the contact point between the center throat and the chute is taken as the base point. At this time, the length of the chute is known. The vertical distance of the scanning device relative to the base point can be obtained through trigonometric functions. According to the vertical distance, the height deviation of the zero material line of the scanning device can be obtained. The deviation can be superimposed on the height change curve and directly projected to the height coordinate system.

[0039] like Figure 3 As shown in the figure, the first scanning result is the scanning result of the scanning device in front of the chute, the second scanning result is the scanning result of the scanning device behind the chute, and the third scanning result is the scanning result of the scanning device in front of the chute when the chute rotates to the same position in the circumferential direction again. By analogy, the area of ​​the space shape enclosed by the first scanning and the second scanning is the cross-sectional area of ​​the material distributed when the chute rotates to the same position this time. By analogy, all the enclosed areas scanned are added together to obtain the following: Figure 4 The material layer distribution of this fabric is shown. Figure 4 The horizontal and vertical coordinates of Figure 3 The definition is the same. Figure 4 It can be understood that in Figure 3 Select two curves from the above. The space enclosed by the two curves is Figure 4 Taking the distribution of the material layer scanned by coke as an example, it can be found that Figure 4 The distribution of coke thickness is not very uniform, especially near the horizontal axis 1200mm, where the coke thickness is obviously much thinner. Therefore, it is considered that the coke distribution in this case is unreasonable, and the distribution system needs to be adjusted to make the coke thickness as uniform as possible.

[0040] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A blast furnace charge surface distribution monitoring system, comprising: Central throat pipe and chute: the central throat pipe is vertically arranged on the top of the blast furnace, with one end aligned with the outlet of the material flow valve of the material tank; The chute is tilted, one end of which is fixed to the other end of the central throat as the feeding end, and the chute rotates around the central throat as the axis and adjusts the material distribution angle, and is characterized by further comprising: Two scanning devices and a processing controller; one scanning device is arranged on the side wall at the front end of the discharge end of the chute along the moving direction, and the other scanning device is arranged on the side wall at the rear end of the discharge end of the chute along the moving direction, the scanning device on the front side wall scans and obtains the blast furnace material surface data before the chute discharges, and the scanning device on the rear side wall scans and obtains the blast furnace material surface data after the chute discharges; the processing controller is connected with the material tank flow valve, the chute and the two scanning devices, and the processor obtains the status of each layer of the blast furnace material surface according to the scanning results of the two scanning devices, and controls the unloading speed of the material tank flow valve and the feeding angle of the chute according to the scanning results.

2. The blast furnace charge surface distribution monitoring system according to claim 1, characterized in that: The scanning device is a laser scanner.

3. A blast furnace charge surface distribution monitoring method, applicable to the blast furnace charge surface distribution monitoring system as claimed in claim 1 or 2, characterized in that: Methods include: After the chute rotates one circle, the blast furnace charge surface data scanned by the scanning devices on the front end side wall and the rear end side wall are obtained respectively. The charge surface height along the radial direction of the blast furnace charge surface at the current position after one circle of charge distribution is obtained according to the charge surface data of the front and rear ends. The overall charge surface height along the radial direction of the blast furnace charge surface at the current position is obtained according to the acquired charge surface height of each circle.

4. A blast furnace charge surface distribution monitoring method, applicable to the blast furnace charge surface distribution monitoring system as claimed in claim 1 or 2, characterized in that: Methods include: Several monitoring points are set on the rotating circle of the chute. When the chute rotates to the monitoring points, the blast furnace material surface data scanned by the scanning equipment on the front side wall and the scanning equipment on the rear side wall are respectively obtained. The material distribution height along the radial direction of the blast furnace material surface at the current monitoring point position in the circle is obtained according to the blast furnace material surface data at the front and rear ends. The overall material distribution height of the blast furnace material surface is obtained according to the obtained material distribution height of each monitoring point in the circle.

5. The blast furnace charge surface distribution monitoring method according to claim 3 or 4, characterized in that: The method for obtaining the material distribution height along the radial direction of the blast furnace material surface is: Construct a material distribution height coordinate system, in which the horizontal axis is the distance from the blast furnace radial direction to the blast furnace center; the vertical axis is the distance from the zero material line in height, and the material surface data of the front and rear ends of the blast furnace are plotted in the height coordinate system. The area enclosed by the two curves can reflect the spatial shape of the material distribution at the current position. According to the spatial shape, the material distribution height at any coordinate point on the horizontal axis can be obtained.

6. The blast furnace charge surface distribution monitoring method according to claim 3 or 4, characterized in that: The blast furnace charge surface distribution monitoring method further includes: after obtaining the charge distribution height at the current position, adjusting the inclination angle of the next circle chute at this position and / or adjusting the charge distribution speed.

7. The blast furnace charge surface distribution monitoring method according to claim 4, characterized in that: When setting the monitoring points, it also includes dividing the material surface into several areas, and setting at least one monitoring point in each area.

8. The blast furnace charge surface distribution monitoring method according to claim 4 or 7, characterized in that: The monitoring points are set at equal intervals.

9. The blast furnace charge surface distribution monitoring method according to claim 8, characterized in that: The number of monitoring points is an even number.

10. The blast furnace charge surface distribution monitoring method according to claim 9, characterized in that: The number of monitoring points shall be at least four.

Images