A blast furnace burden distribution angle measuring device

Abstract

The application discloses a blast furnace burden distribution angle measuring device, which comprises a first radar and a second radar installed on a blast furnace gas sealing cover, the measuring line of the first radar is in the same vertical plane with the vertical center line of the blast furnace, the measuring line of the second radar is in the same vertical plane with the vertical center line of the blast furnace, the measuring lines of the first radar and the second radar can be shot to the surface of the burden chute and to different positions of the burden chute, and the included angle alpha between the burden chute and the vertical center line of the blast furnace is calculated according to the distances between the first radar and the second radar and the surface of the burden chute, the angle of the measuring line of the first radar, the angle of the measuring line of the second radar and the relative position of the first radar and the second radar. The device can realize online measurement, is simple to measure, can guarantee normal production of the blast furnace, has no hidden danger to personal safety, has high measurement precision, fast measurement speed and low measurement cost.

Description

Technical Field

[0001] This invention relates to the field of blast furnace ironmaking technology, and in particular to a blast furnace charging angle measuring device. Background Technology

[0002] The requirements for the charging angle of the charging chute at the top of the blast furnace are becoming increasingly stringent. Due to the special nature of blast furnace production, which involves high temperature, high pressure, high dust, and continuous production inside the gas sealing box at the top of the blast furnace, it is impractical to directly measure the charging chute angle.

[0003] Currently, the measurement of the charging angle of the blast furnace charging chute still uses the photoelectric encoder disk method. As the charging angle is repeatedly adjusted during blast furnace production, it not only increases the labor intensity on site, but also, due to the low accuracy of angle control, the cumulative angle error will become larger and larger, seriously affecting the normal production of the blast furnace.

[0004] Currently, the angle detection of the charging chute can only be performed during blast furnace shutdown and maintenance. The main measurement methods include direct manual measurement, indirect manual measurement, and laser 3D scanning. Direct and indirect manual measurements not only have significant errors and inaccurate measurement precision, but also pose considerable safety hazards due to the high temperature, high humidity, and dust levels at the site. Laser 3D scanning provides relatively accurate data, but the high temperature and dust conditions at the site, requiring scanning from the outside, severely affect its accuracy. Furthermore, extensive data processing is required after scanning, which is time-consuming and costly. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a blast furnace charging angle measuring device.

[0006] This application provides a blast furnace charging angle measuring device, including a first radar and a second radar installed on the blast furnace gas sealing cover. The measuring line of the first radar is in the same vertical plane as the vertical center line of the blast furnace, and the measuring line of the second radar is in the same vertical plane as the vertical center line of the blast furnace. The measuring lines of the first radar and the second radar can both hit the surface of the charging chute and hit different positions of the charging chute. Based on the measured distances between the first radar and the second radar and the surface of the charging chute, the angle of the measuring line of the first radar, the angle of the measuring line of the second radar, and the relative positions of the first radar and the second radar, the angle α between the charging chute and the vertical center line of the blast furnace is calculated.

[0007] In some implementations, the distances from the first radar and the second radar to the vertical centerline of the blast furnace are not equal.

[0008] In some implementations, the measurement lines of the first radar are not parallel to those of the second radar.

[0009] In some implementations, nitrogen gas is continuously introduced into the space surrounding the first and second radars.

[0010] In some implementations, after obtaining the included angle α, the obtained included angle α is compared with the mechanical angle α set in this state, and the deviation caused by the installation, maintenance and mechanical adjustment of the fabric chute is adjusted.

[0011] In some embodiments, the first radar and the second radar are set at different positions in the circumference of the blast furnace. Based on the time difference between the measurements of the first radar and the second radar and the circumferential difference between the installation positions of the first radar and the second radar, the rotation speed of the feeding chute is obtained, and the instantaneous circumferential position angle β of the feeding chute is obtained.

[0012] In some implementations, when material is being distributed in the distribution chute, the size of the material flow and the fluctuation of the material velocity in the distribution chute can be determined based on the data measured by the first radar and the second radar.

[0013] In some implementations, the opening of the material flow regulating valve γ angle is adjusted according to the material flow rate and material velocity fluctuation of the material chute.

[0014] In some implementations, when the fabric chute is idling, the wear condition of the inner surface of the fabric chute is determined based on the data measured by the first radar and the second radar.

[0015] In some implementations, the first radar, the second radar, and the vertical centerline of the blast furnace are in the same vertical plane.

[0016] The beneficial effects of this application are as follows: It provides a blast furnace charging angle measuring device, which performs online measurement of the charging chute using a first radar and a second radar. The measuring line of the first radar is set to be in the same vertical plane as the vertical center line of the blast furnace, and the measuring line of the second radar is also in the same vertical plane as the vertical center line of the blast furnace. The measuring lines of both the first and second radars can reach the surface of the charging chute and different positions on the chute. Based on the pre-determined measuring line angles of the first and second radars, as well as the relative positions of the first and second radars, the angle α between the charging chute and the vertical center line of the blast furnace can be directly calculated by measuring the distances between the first and second radars and the surface of the charging chute. This device can achieve online measurement, is simple to use, ensures normal blast furnace production, eliminates personal safety hazards, and has high measurement accuracy, fast measurement speed, and low measurement cost. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention.

[0018] Figure 1This is a schematic diagram of a blast furnace charging angle measuring device provided in this application.

[0019] Attached diagram captions: 1-First radar, 2-Second radar, 3-Fabric chute, 4-Gas sealing cover. Detailed Implementation

[0020] With the continuous development and scaling up of blast furnace production technology, the requirements for the charging angle of the top charging chute are becoming increasingly stringent. However, due to the unique characteristics of blast furnace production—high temperature, high pressure, high dust, and continuous production within the top gas sealing box—directly measuring the charging chute angle is impractical. Currently, the measurement of the charging angle of the blast furnace charging chute still relies on a photoelectric encoder, which monitors the main shaft of the chute's rotary drive mechanism, reducer, or transmission mechanism, connects it to a photoelectric encoder, and converts it into an angle.

[0021] Therefore, during blast furnace production, the upper and lower mechanical limit positions of the charging chute need to be checked every shift to determine the maximum and minimum angle positions of the photoelectric encoder disk, which serves as the reference for controlling the charging angle. The upward or downward movement of the mechanical drive device causes cumulative downward or upward angle deviations. Repeated adjustments to the charging angle are necessary during blast furnace production, increasing labor intensity on-site. Furthermore, due to the low precision of angle control, the cumulative angle error grows larger and larger, severely impacting normal blast furnace production.

[0022] Currently, the angle detection of the charging chute can only be performed during blast furnace shutdown and maintenance. Measurement methods mainly include manual direct measurement, indirect measurement, and laser 3D scanning. Manual direct and indirect measurements not only have significant errors and inaccurate measurement precision, but also pose considerable safety hazards due to the high temperature, dust, and high levels of gas present at the site. Laser 3D scanning provides relatively accurate data, but the high temperature and dust conditions at the site, requiring scanning from the outside, severely affect its accuracy. Furthermore, extensive data processing is required after scanning, which is time-consuming and costly.

[0023] Therefore, this application discloses a blast furnace charging angle measuring device, including a first radar 1 and a second radar 2, such as... Figure 1 As shown, both the first radar 1 and the second radar 2 are installed on the blast furnace gas sealing cover 4.

[0024] The measurement line of the first radar 1 is defined to lie in the same vertical plane as the vertical centerline of the blast furnace. Therefore, provided the measurement line of the first radar 1 is not obstructed, it can intersect the vertical centerline of the blast furnace. Figure 1 The two lines intersect at point E.

[0025] It also stipulates that the measurement line of the second radar 2 is in the same vertical plane as the vertical centerline of the blast furnace, so that the measurement line of the second radar 2 can intersect the vertical centerline of the blast furnace, provided that the measurement line of the second radar 2 is not obstructed. Figure 1 The two lines intersect at point F.

[0026] It is also specified that, under the condition that the fabric chute 3 is rotating, at certain times, the measuring line of the first radar 1 hits the surface of the fabric chute 3, so that the AC segment distance S1 at that time can be measured; at certain times, the measuring line of the second radar 2 hits the surface of the fabric chute 3, so that the BD segment distance S2 at that time can be measured.

[0027] The surface of the fabric chute 3 is defined by the measuring lines of the first radar 1 and the second radar 2 projecting them to different positions. Figure 1 In the middle, this is shown as points C and D not coinciding.

[0028] Given that the positions of the first radar 1 and the second radar 2 are fixed, the relative positions of the first radar 1 and the second radar 2 (shown as points A and B in the diagram) are fixed, and the angle of the measuring line of the first radar 1 is... Figure 1 In the figure, ∠1 is the angle of the measuring line of the second radar 2. Figure 1 The ∠2 in the figure is also fixed. These parameters do not involve the precise measurement of the installation parameters of the fabric chute and the on-site installation position, which helps to ensure measurement accuracy.

[0029] Specifically, by combining the surface tilt angle of the gas sealing cover 4 installed on each radar, the angle ∠BAC between the measuring line and the surface of the gas sealing cover can be determined by the measuring line angle ∠1 of the first radar 1, and the angle ∠ABD between the measuring line and the surface of the gas sealing cover can be determined by the measuring line angle ∠2 of the second radar 2.

[0030] Please refer to Figure 1 As the angle of the fabric chute is adjusted, Figure 1 Points C and D in the diagram move along their respective measurement lines AE and BF.

[0031] Based on the parameters mentioned above, and according to the measured distances S1 between the first radar 1 and the surface of the fabric chute 3, and S2 between the second radar 2 and the surface of the fabric chute 3, the inclination of segment CD can be easily calculated in the ABCD diagram. This inclination reflects... Figure 1 The size of ∠3 in the figure is given by the angle α between the material chute 3 and the vertical center line of the blast furnace.

[0032] The above method uses two radars to measure online and scan the surface of the chute to obtain two curves. The angle α between the curves and the center line of the blast furnace is calculated based on the values ​​of the corresponding points. Due to continuous online and repeated monitoring, the data is accurate and reliable.

[0033] In summary, during the process of measuring the charging angle of the blast furnace charging chute using this device, the length parameters S1 and S2 are obtained only through the first radar 1 and the second radar 2, enabling online measurement. The measurement is simple, ensures normal blast furnace production, and eliminates any personal safety hazards. The radar probes involved in this device are already widely used in blast furnaces, offering high measurement accuracy and stable performance. This gives the device significant advantages in measuring the included angle α, including high accuracy, fast measurement speed, and low cost.

[0034] Please refer to Figure 1 , Figure 1 In essence, it demonstrates that the first radar 1, the second radar 2, and the vertical centerline of the blast furnace are all in the same vertical plane, from which it can be drawn. Figure 1 The figure shown is illustrated. When the measuring line of the first radar 1 is not on the same vertical plane as the vertical center line of the blast furnace, and the measuring line of the second radar 2 is not on the same vertical plane as the vertical center line of the blast furnace, the angle α between the charging chute and the vertical center line of the blast furnace can also be calculated based on the above data.

[0035] To achieve the goal of having the surface of the feeding chute illuminated at different positions by the measuring lines of the first radar 1 and the second radar 2, in some embodiments, a distance is defined between the first radar 1 and the second radar 2 in the radial direction of the blast furnace, i.e., the distance from the first radar 1 to the vertical center line of the blast furnace is not equal to the distance from the second radar 2 to the vertical center line of the blast furnace; or, when the distance from the first radar 1 to the vertical center line of the blast furnace is equal to the distance from the second radar 2 to the vertical center line of the blast furnace, corresponding to the first radar 1 and the second radar 2 being arranged on the same circumference of the blast furnace, the measuring lines of the first radar 1 and the second radar 2 are defined as not being parallel.

[0036] Of course, when the distance from the first radar 1 to the vertical center line of the blast furnace is equal to the distance from the second radar 2 to the vertical center line of the blast furnace, the measurement line of the first radar 1 and the measurement line of the second radar 2 can also be restricted to not being parallel.

[0037] Due to factors such as the large volume of gas, high temperature, and abundant dust at the blast furnace site, nitrogen gas can be continuously introduced into the space surrounding the first radar 1 and the second radar 2. The nitrogen gas creates positive pressure in the space to isolate the dust. Nitrogen gas also has heat-insulating properties, cooling and protecting the radars. The nitrogen gas ultimately enters the blast furnace. The aforementioned space surrounding the radars refers to the enclosed space between the radars and the sleeve-like structures on which they are installed.

[0038] After obtaining the included angle α, the obtained included angle α is compared with the mechanical angle α set in this state, and the deviation caused by the installation, maintenance and mechanical adjustment of the charging chute is adjusted to reduce the adverse effects of the charging angle deviation on the normal production of the blast furnace.

[0039] The aforementioned blast furnace charging angle measuring device also has the following additional uses.

[0040] The first radar 1 and the second radar 2 are set at different positions on the circumference of the blast furnace. Based on the time difference measured by the first radar 1 and the second radar 2 and the circumferential installation position of the first radar 1 and the second radar 2, the rotation speed of the feeding chute 3 can be calculated, thereby determining the instantaneous position of the feeding chute 3, that is, the instantaneous circumferential position β angle of the feeding chute.

[0041] During material distribution in the chute, the first radar 1 measures one curve on the surface of the chute 3, and the second radar 2 measures another curve on the surface of the chute 3. Processing these two curves yields two sets of data points. Based on the data measured by the first radar 1 and the second radar 2, the magnitude and velocity fluctuations of the material flow in the chute can be determined. Furthermore, based on the magnitude and velocity fluctuations of the material flow in the chute, the opening angle γ of the material flow regulating valve can be determined and inferred. The valve can then be manually adjusted to achieve uniform material distribution.

[0042] When the fabric chute is idling, the data measured by the first radar 1 and the second radar 2 are used to reflect the fabric chute itself, thereby judging the wear condition of the inner surface of the fabric chute and determining the subsequent replacement time.

[0043] It should be noted that if a single radar measurement is used to roughly determine the fabric angle α of the fabric chute, the installation parameters of the fabric chute and the precise measurement of the on-site installation position are required, which is not conducive to simplifying the measurement and ensuring measurement accuracy.

[0044] When the material feeding chute is moved away, the first radar 1 or the second radar 2 irradiates the material surface or brick lining inside the furnace. The radar operation status can be monitored based on the data measured at this time, or it can be used as a blast furnace material gauge.

[0045] In summary, this device allows for online measurement of the charging chute, real-time monitoring of its charging angle, working condition, surface wear, and other factors. It can also monitor the chute's rotation position and material flow changes, providing more reference data for blast furnace operation.

[0046] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0047] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for charging a blast furnace, characterized in that, A blast furnace charging angle measuring device is applied, including a first radar and a second radar installed on the blast furnace gas sealing cover. The first radar and the second radar are set at different positions in the circumferential direction of the blast furnace. Nitrogen gas is continuously introduced into the space around the first radar and the second radar. The measuring line of the first radar is in the same vertical plane as the vertical center line of the blast furnace, and the measuring line of the second radar is in the same vertical plane as the vertical center line of the blast furnace. The measuring lines of the first radar and the second radar can both hit the surface of the charging chute and hit different positions of the charging chute. The blast furnace charging method includes: Based on the measured distances between the first radar and the second radar and the surface of the feeding chute, the measuring line angle of the first radar, the measuring line angle of the second radar, and the relative positions of the first radar and the second radar, the angle α between the feeding chute and the vertical center line of the blast furnace is calculated. Compare the obtained included angle α with the mechanical angle α set in this state, and adjust the deviation caused by the installation, maintenance and mechanical adjustment of the cloth chute; Based on the time difference measured by the first radar and the second radar, as well as the circumferential difference in the installation positions of the first radar and the second radar, the rotation speed of the fabric chute is obtained, and the instantaneous circumferential position angle β of the fabric chute is obtained. When the material is being distributed in the chute, the first radar measures one curve on the surface of the chute, and the second radar measures another curve on the surface of the chute. The two curves are processed to obtain two sets of data points. The material flow rate and material velocity fluctuation of the chute can be determined based on the data measured by the first radar and the second radar. The opening of the material flow regulating valve γ angle can be adjusted according to the material flow rate and material velocity fluctuation of the chute. When the fabric chute is idling, the data measured by the first radar and the second radar are reflected in the fabric chute itself, so as to judge the wear condition of the inner surface of the fabric chute and determine the subsequent replacement time. When the feeding chute is moved away, the first radar or the second radar beam irradiates the material surface or brick lining inside the furnace. The working status of the first radar or the second radar can be monitored based on the data measured at this time, or the first radar or the second radar can be used as a blast furnace material gauge.

2. The blast furnace charging method as described in claim 1, characterized in that, The distances from the first radar and the second radar to the vertical centerline of the blast furnace are not equal.

3. The blast furnace charging method as described in claim 1, characterized in that, The measurement lines of the first radar are not parallel to those of the second radar.

4. The blast furnace charging method as described in claim 1, characterized in that, The first radar, the second radar, and the vertical centerline of the blast furnace are in the same vertical plane.

Images