TWI450971B - Method for measuring material trajectory in blast furnace - Google Patents

Description

Measuring method for blanking trajectory of blast furnace

The invention relates to a measuring method, and in particular to a measuring method of a blanking trajectory of a blast furnace (Blast Furnace).

The fabric operation mode of the blast furnace affects the distribution of the layer structure and the furnace gas. Therefore, if the outer edge of the stream and the inner edge curve can be provided when the material groove is filled at each angle, the center line of the stream can be defined. The information on the flow point of the stream can then be obtained from the defined centerline of the stream, which can help the field operator to control the geometry of the material surface, thereby improving the gas permeability of the material surface and increasing the gas utilization rate. Stabilize the thermal load on the blast furnace wall. Therefore, the flow path of the blast furnace fabric is a very important information for improving the production efficiency of the blast furnace.

At present, there are several ways to measure the trajectory of the blast furnace. The first method is “The Blowin Charging Measurement of 2500M3 BF at Shanghai No. 1 Iron &> by Gao, ZK et al., 2001, Ironmaking Conference Proceedings. Steel (Group) Co. Ltd.". This method is a contact measurement method. This method is to set up a cross grid in the blast furnace to serve as a coordinate reference to understand the position of the blank in the blast furnace. However, since this method requires a support frame to fix the cross grid, when the cloth groove traverses the support frame, the blanking will directly contact the support frame, which will affect the predicted landing position on the spot.

The second method is “Stabilizing Burden Trajectory into Blast Furnace Top under High Ore to” by Matsui, Y. et al., 2002, IEIJ International, Vol. 43, pp. 1159-1166. Coke Ratio Operation". This method is also a contact type measuring method, which is to set a receiving box at the position of the blast furnace zero material level line, and the material weight of the receiving box determines the material trajectory. However, similarly, when the fabric trough is blanked, the blanking material will touch the receiving box, thereby affecting the predicted landing position on the spot.

The third method is "Measurement of Material Trajecties in Bell-less Top Charging" proposed by Steyls, D. et al. in the technical data of Sollac Steel, France. This method is also a contact measurement method. In this manner, the measuring rod is connected to a load cell and associated recording system outside the blast furnace. When the cloth is clothed, the charge will hit the measuring rod in the blast furnace, and different positions will generate load signals of different strengths. The operator then determines the point at which the charge falls and simulates the flow path. However, similarly, when the cloth layer is blanked, the charge will hit the measuring rod in the blast furnace, thereby affecting the spot position predicted on the spot.

The fourth method is the “Preliminary Report on the Opening and Unloading Measurement of Zhonglong No. 1 Blast Furnace” proposed by Gao Zhengyu and Gaotai of Beijing Shenwang Innovation Technology Co., Ltd. in 2010. This method is a non-contact laser grid method. In this way, when the stream passes through the plane of the laser grid, the laser beam hits the bright spot on the stream as the basis for the measurement of the flow profile.

Please refer to FIG. 1A and FIG. 1B , which respectively show a laser grid image in a blast furnace and a blast furnace mechanical diagram corresponding to the blast furnace laser grid image of FIG. 1A . In the fourth method of the non-contact measurement method of the blast furnace blanking trajectory, the laser grid is used to measure the flow trajectory in the blast furnace. The non-contact measurement method first installs two laser emitters 102 and 104 in the east hole 110 and the west hole 112 of the blast furnace 108, respectively. Next, a camera (not shown) is installed in a manhole (not shown) in the north side of the blast furnace 108.

The two laser emitters 102 and 104 respectively emit laser beams 114 and 116 from the east hole 110 and the west hole 112, and then take images by using a camera disposed in the north hole, and the obtained image is as shown in FIG. 1A. Laser grid image 100a. These laser beams 114 and 116 intersect each other to form a reference coordinate 118 inside the blast furnace 108, as shown in the laser grid image 100a of Fig. 1A and the corresponding blast furnace mechanical diagram 100b of Fig. 1B. This reference coordinate 118 is perpendicular to the ground and passes through the centerline of the blast furnace 108.

When the fabric trough 106 of the blast furnace 108 is clothed from above the blast furnace 108, the fabric trough 106 rotates in a concentric manner, and the stream 120 cuts off the laser grid formed by the laser beams 114 and 116. At this point, the laser beams 114 and 116 will strike the stream 120, thereby forming a plurality of bright spots 122, as shown in FIG. 1A. The method then manually traces the position of the bright spot 122 on the laser grid image 100a of FIG. 1A to the blast furnace mechanical diagram 100b of FIG. 1B, and completes the stream 120 of the blast furnace 108. Track measurement procedure.

However, since the coordinate conversion process of drawing the trajectory of the stream 120 from the laser grid image 100a to the blast furnace mechanical diagram 100b is entirely artificially determined, such a method is not only time consuming, but also the rendering result by different people may be Inconsistent, so the accuracy is not good.

Therefore, one aspect of the present invention is to provide a measuring method for the blanking trajectory of a blast furnace, which uses a plane conversion method to convert between the grid coordinates of the image and the coordinates of the mechanical map of the blast furnace. Therefore, the time required to map the flow path coordinates on the image to the blast furnace mechanical map can be greatly reduced.

Another aspect of the present invention is to provide a measuring method for the blanking trajectory of a blast furnace, which can effectively improve the accuracy of the trajectory measurement of the blast furnace.

Another aspect of the present invention is to provide a measuring method for a blanking trajectory of a blast furnace, which can provide a high-accuracy flow curve of the outer edge of the flow and a curve of the inner edge of the flow, and can assist the field staff of the blast furnace to set the required The shape of the material surface can further improve the production efficiency of the blast furnace.

According to the above object of the present invention, a measuring method of a blanking trajectory of a blast furnace is proposed, which comprises the following steps. A plurality of beams are used to form a grid plane in the blast furnace, wherein the grid plane contains at least four grid intersections. The inside of the blast furnace is photographed by a camera to obtain an image of the aforementioned grid plane. A plurality of intersection points are defined on a mechanical map of the blast furnace corresponding to grid intersections of the grid planes in the image. Calculate one of the parameters between the coordinates of these intersections and the coordinates of the corresponding grid intersection. From the foregoing image, a plurality of outer edge bright point coordinates and a plurality of inner edge bright point coordinates of the light beam are struck in a stream. Using the aforementioned corresponding parameters, a plurality of corresponding outer edge bright point coordinates and a plurality of corresponding inner edge bright point coordinates of the outer edge bright point coordinates and the inner edge bright point coordinates in the mechanical map are respectively calculated. A curve fitting process is performed on the corresponding outer edge bright point coordinates and the corresponding inner edge bright point coordinates to obtain an outer edge track curve and an inner edge track curve of the foregoing stream.

According to an embodiment of the invention, the beam of light is provided by at least two strong light sources.

According to another embodiment of the invention, the above-described intense light source comprises a laser emitter.

According to still another embodiment of the present invention, the curve fitting process described above is performed using a computer device.

According to still another embodiment of the present invention, the curve fitting process described above is performed using a quadratic curve equation.

Referring to FIG. 2, FIG. 3A and FIG. 3B together, FIG. 2 is a flow chart showing a method for measuring a blanking trajectory of a blast furnace according to an embodiment of the present invention, and a flow chart according to an embodiment of the present invention. The grid image in the blast furnace and the blast furnace mechanical map corresponding to the blast furnace grid image in Fig. 3A. In the present embodiment, when the measurement method 200 of the blanking trajectory of the blast furnace is performed, first, as described in step 202, a plurality of light beams 314 and 316 are respectively formed in the blast furnace 308 by using, for example, at least two strong light sources 302 and 304. As shown in Figures 3A and 3B. These beams 314 and 316 intersect each other to define a grid plane 320 within the blast furnace 308. In an exemplary embodiment, intense light sources 302 and 304 can be, for example, laser emitters.

Next, as described in step 204 of the metrology method 200, a camera (not shown) is mounted at a location where the blast furnace 308 can capture a panoramic view of the grid plane 320. The camera is used to capture the interior of the blast furnace 308, thereby obtaining images of the beams 314 and 316, and the grid planes 320 formed by the beams 314 and 316.

Next, at least four grid intersections 318 are marked in the grid plane 320 of the grid image 300a of FIG. 3A. In the embodiment illustrated in FIG. 3A, thirteen grid intersections 318 are collectively indicated in the grid plane 320 of the grid image 300a. Then, as described in step 206 of the metrology method 200, a plurality of intersections 322 are labeled and defined on the mechanical map 300b of the blast furnace 308, as shown in FIG. 3B. The positions of the intersections 322 correspond to the grid intersections 318 on the grid plane 320 in the grid image 300a, respectively.

Next, as described in step 208 of method 200, the corresponding parameters between the coordinates of the intersections 322 of the mechanical map 300b and the coordinates of the grid intersections 318 on the corresponding grid image 300a are calculated. In this calculation step, the plane coordinates of the grid intersection point 318 on the grid image 300a may be first determined as Where i = 1~N and N is the number of grid intersections 318. In the exemplary embodiment of FIG. 3A, the number of grid intersections 318 is thirteen, so N is 13. The coordinates of the corresponding intersection 322 on the mechanical map 300b of the blast furnace 308 are again Since the intersection 322 corresponds to the grid intersection 318, i=1~N, where N is the number of grid intersections 318, which is also the number of intersections 322. The correspondence between the coordinates of the grid intersection 318 and the coordinates of the intersection 322 can be expressed as a _i b _i . The coordinates of the grid intersection 318 and the coordinates of the intersection 322 can be represented by the following mathematical equation (1):

b _i =Ha _i (1)

Wherein, since a _i and b _i are both a 3×1 matrix, H is a 3×3 matrix, and H is used to represent a _i Corresponding parameters for conversion between b _i . In some embodiments, this corresponding parameter H can be solved in a general direct linear transformation (DLT) or other non-linear optimization.

Next, please refer to FIG. 4A and FIG. 4B , which respectively illustrate a grid image in a blast furnace and a blast furnace grid corresponding to FIG. 4A according to an embodiment of the present invention. Image of the blast furnace mechanical map. When the fabric trough 306 of the blast furnace 308 is clothed from above the blast furnace 308, the fabric trough 306 will rotate in a concentric manner, and the stream 324 will cut the grid plane 320 formed by the beams 314 and 316. At this point, beams 314 and 316 are struck on stream 324, thereby forming a plurality of outer edge bright spots 310 and a plurality of inner edge bright spots 326, as shown in FIG. 3A. The measurement method 200 then, as described in step 210, according to the grid image 300a, the captured beams 314 and 316 strike the plurality of outer edge bright spots 310 and inner edge bright spots 326 formed by the stream 324, and find out the outer edge bright spots. The coordinates of 310 and inner edge highlight 326 on grid plane 320.

Next, as described in step 212 of the metrology method 200, pass the equation (1) b _i =Ha _i , and use the corresponding parameter H calculated in step 208, and the outer edge bright spot 310 and the inner edge bright spot 326 in the grid plane. coordinates in 320 (i.e., equation (1) b _i = Ha _i is a _i), respectively calculate the highlight edge 310 and the inner edge 326 of the highlight coordinate plane 320 outside the grid of Figure 4B in the blast furnace 308 The corresponding outer edge bright spot 312 in the mechanical map 300b and the coordinate corresponding to the inner edge bright spot 328.

Then, as described in step 214 of the metrology method 200, the coordinates of the corresponding outer edge bright spot 312 in the mechanical map 300b and the coordinates of the corresponding inner edge bright spot 328 are respectively subjected to curve fitting processing by using, for example, a computer device, to obtain a stream 324. The outer edge trajectory curve 330 and the inner edge trajectory curve 332 are as shown in FIG. 4B. In an embodiment, the quadratic equation can be used to perform the fitting process of the outer edge trajectory curve 330 and the inner edge trajectory curve 332 of the stream 324. Therefore, the outer edge trajectory curve 330 and the inner edge trajectory curve 332 can be represented by a parabolic quadratic polynomial, respectively.

It can be seen from the above embodiments of the present invention that one of the advantages of the present invention is that the measurement method of the blanking trajectory of the blast furnace of the present invention uses a plane conversion method to convert between the grid coordinates of the image and the coordinates of the mechanical map of the blast furnace. Therefore, the time required to map the flow path coordinates on the image to the blast furnace mechanical map can be greatly reduced.

According to the embodiment of the present invention, another advantage of the present invention is that in the measuring method of the blanking trajectory of the blast furnace of the present invention, the coordinate conversion system uses the plane conversion method, which can effectively avoid the error of human judgment, so the application of the present invention The method of the invention can effectively improve the accuracy of the trajectory measurement of the blast furnace.

According to the embodiment of the present invention, another advantage of the present invention is that the measurement method of the blanking trajectory of the blast furnace of the present invention can provide a high-accuracy flow curve of the outer edge of the flow and the inner edge of the flow, and utilize the flow. The outer edge curve and the inner curve of the flow line can assist the field staff of the blast furnace to set the required material surface shape, thereby improving the production efficiency of the blast furnace.

While the present invention has been described above by way of example, it is not intended to be construed as a limitation of the scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100a. . . Laser grid image

100b. . . Blast furnace mechanical drawing

102. . . Laser transmitter

104. . . Laser transmitter

106. . . Cloth trough

108. . . blast furnace

110. . . East manhole

112. . . Western manhole

114. . . Laser beam

116. . . Laser beam

118. . . Reference coordinates

120. . . Stream

122. . . Highlight

200. . . Measurement method

202. . . step

204. . . step

206. . . step

208. . . step

210. . . step

212. . . step

214. . . step

300a. . . Grid image

300b. . . Mechanical drawing

302. . . Strong light source

304. . . Strong light source

306. . . Cloth trough

308. . . blast furnace

310. . . Outer edge highlight

312. . . Corresponding to the outer edge highlights

314. . . beam

316. . . beam

318. . . Grid intersection

320. . . Grid plane

322. . . Intersection

324. . . Stream

326. . . Inner edge highlights

328. . . Corresponding to the inner edge highlights

330. . . Rim trajectory curve

332. . . Inner edge trajectory curve

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.

Figure 1A shows a laser grid image in a blast furnace.

Fig. 1B is a blast furnace mechanical diagram corresponding to the blast furnace laser grid image of Fig. 1A.

2 is a flow chart showing a method for measuring a blanking trajectory of a blast furnace according to an embodiment of the present invention.

FIG. 3A is a view showing a grid image in a blast furnace according to an embodiment of the present invention.

Fig. 3B is a mechanical view of the blast furnace corresponding to the blast furnace grid image of Fig. 3A.

Fig. 4A is a view showing a mesh image in a blast furnace in the case of a cloth groove cloth according to an embodiment of the present invention.

Figure 4B is a blast furnace mechanical diagram corresponding to the blast furnace grid image of Figure 4A.

200. . . Measurement method

202. . . step

204. . . step

206. . . step

208. . . step

210. . . step

212. . . step

214. . . step

Claims (5)

A method for measuring a blanking trajectory of a blast furnace, comprising: forming a grid plane in the blast furnace by using a plurality of beams, wherein the grid plane comprises at least four grid intersections; and photographing the interior of the blast furnace by using a camera to obtain the An image of a grid plane; defining, at a mechanical map of the blast furnace, a plurality of intersection points respectively corresponding to the grid intersections of the grid planes in the image; calculating coordinates of the intersection points and corresponding to the meshes Corresponding parameters between the coordinates of the intersection point; obtaining a plurality of outer edge bright point coordinates and a plurality of inner edge bright point coordinates of the light beams in the image from the image; using the corresponding parameters, respectively calculating the outer edges a plurality of corresponding outer edge bright point coordinates and a plurality of corresponding inner edge bright point coordinates of the bright point coordinates and the inner edge bright point coordinates in the mechanical figure; and the corresponding outer edge bright point coordinates and the corresponding inner edge bright point coordinates respectively A curve fitting process is performed to obtain an outer edge trajectory curve and an inner edge trajectory curve of the stream. A method of measuring a blanking trajectory of a blast furnace according to claim 1, wherein the beams are provided by at least two strong light sources. A method of measuring a blanking trajectory of a blast furnace according to claim 2, wherein the strong light sources comprise a laser emitter. The measuring method of the blanking trajectory of the blast furnace according to claim 1, wherein the curve fitting processing is performed by using a computer device. The method for measuring a blanking trajectory of a blast furnace according to claim 1, wherein the curve fitting process is performed by using a quadratic curve equation.