TWI642789B - Method for obtaining distribution of coke ratio of material layer after blast furnace feeding - Google Patents

Abstract

The present invention relates to a method for obtaining a distribution ratio of a coal seam after a blast furnace feed. The method comprises the steps of: obtaining a blast furnace surface measurement data; removing noise data in the blast furnace material surface measurement data; smoothing the blast furnace material surface measurement data to calculate a material layer volume; and utilizing The distribution of the coke ratio was calculated for each batch of the weight of the blank and the volume of the layer.

Description

Method for obtaining distribution of coke ratio of material layer after blast furnace feeding

The present invention relates to a method for obtaining a distribution ratio of a coal seam after a blast furnace feed.

In the conventional blast furnace operation, proper distribution of the material layer helps to reduce the gas permeability resistance in the blast furnace furnace to improve the heat and reaction of the furnace material, and is an important operation factor for the stable operation and lifting efficiency of the blast furnace. Compared with coke, the particle size of the iron-containing raw material is small, and the formed layer has a large resistance to the furnace gas. Therefore, the weight ratio distribution of the iron ore layer and the coke layer is often used as an important index of the furnace gas flow. For example, when the thermal load on the blast furnace wall is raised, the blast furnace operators often increase the ratio of the coal to the surrounding gas to suppress the surrounding airflow intensity, or reduce the ratio of the core to the core to facilitate the development of the blast furnace center airflow.

However, the method for obtaining the distribution of the coke ratio of the blast furnace layer is calculated by the distribution of the material surface, so that the accuracy is affected by the calculation parameters such as the shape of the starting material surface, the feeding speed and the trajectory of the material flow. Since the above parameters must be treated in a hypothetical manner, the reference for the resulting mineral-to-focus ratio distribution is limited.

Therefore, it is necessary to provide an innovative and progressive method for obtaining the distribution of the coke ratio of the blast furnace after the feed layer to solve the above problems.

In one embodiment, a method for obtaining a distribution ratio of a coal seam after a blast furnace feed comprises the steps of: obtaining a blast furnace level measurement data; removing noise data in the blast furnace level measurement data; smoothing treatment The blast furnace material surface measurement data is used to calculate the volume of the material layer; and the distribution of the coke ratio is calculated by using the weight of each batch of the material and the volume of the material layer.

S11~S14‧‧‧Steps

(a1)~(a9)‧‧‧ steps

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart showing the method for obtaining the distribution of the coke ratio of the blast furnace after the blast furnace is fed.

Figure 2 shows a flow chart of the blast furnace feed of the present invention.

Fig. 3 is a view showing the measurement result of the measurement of the thickness distribution data of the layer of the present invention after the addition of the signal of (a8).

4 shows the measurement timing of the thickness distribution data of the material layer of the present invention as a measurement result obtained when the (a1) signal is received, and when the (a5) signal is present, the finished material is measured.

Figure 5 shows a map of the noise data points of the present invention.

Fig. 6 is a view showing a comparison of (a) and (b) before the smoothing treatment of the coke layer measurement results of the present invention.

Fig. 7 is a view showing a comparison of (a) and (b) before the smoothing treatment of the iron ore layer (iron-containing raw material layer) of the present invention.

Figure 8 is a graph showing the calculated ratio of the coal-to-focus ratio calculated by the present invention.

The drawings and the common reference numbers are used herein to refer to the same or the like. The invention will be more apparent from the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart showing the method for obtaining the distribution of the coke ratio of the blast furnace after the blast furnace is fed. Referring to step S11 of Fig. 1, a blast furnace level measurement data is obtained. In this step, a resident type surface measuring system can be set on the blast furnace to obtain the blast furnace level measurement data. Further, in the present embodiment, the blast furnace level measurement data includes material layer thickness distribution data.

Referring to Figure 2, there is shown a blast furnace feed flow diagram of the present invention. In this step, the measuring time of the thickness distribution data of the material layer is based on the feeding process signal of FIG. 2: (a1) the airtight valve under the silo is opened; (a2) the airtight valve under the silo is opened and positioned; (a3) The cloth tank flow control valve is opened; (a4) the feeding is started; (a5) the residual weight of the silo is less than 2.5 tons; (a6) whether the judgment time is greater than 143 seconds; (a7) the flotation flow control valve is closed; (a8) The airtight valve under the silo is closed and positioned; and (a9) ends the feeding.

In the present embodiment, the measurement time of the thickness distribution data of the material layer is measured when the (a1) signal is received, in order to obtain the error caused by the energy layer thickness and the measurement lag. The distribution data of the material surface before feeding, and the surface measurement when the (a5) signal appears, to obtain the data of the thickness distribution of the material layer.

Fig. 3 is a view showing the measurement result of the measurement of the thickness distribution data of the layer of the present invention after the addition of the signal of (a8). 4 shows the measurement timing of the thickness distribution data of the material layer of the present invention as a measurement result obtained when the (a1) signal is received, and when the (a5) signal is present, the finished material is measured. Comparing the measurement results of FIG. 3 and FIG. 4, it can be clearly found that the present invention sets the (a1) signal and the (a5) signal before and after the measurement time of the thickness distribution data of the material layer, and can further show the characteristics of the material layer.

Referring to step S12 of FIG. 1, the noise data in the blast furnace level measurement data is removed. When the shape of the blast furnace is measured, the intensity of the microwave rebound wave received by the receiver is higher and the accuracy is high. In the measurement process, when the microwave source is perpendicular to the measurement surface (the platform side of the furnace wall), the intensity of the rebound wave is the largest; otherwise, the normal angle of the two is larger (the surface slope is close to the furnace) The heart area), the obtained rebound wave intensity is weak, and the measurement result is susceptible to dust interference.

According to the invention, the slope of the material surface slope ranges from 36° to 41°. because Therefore, the present invention is to set a data screening mechanism in the measurement to remove the data point whose slope on the slope of the material is higher than 42°, that is, the noise data is a data point whose slope on the slope of the material is higher than 42°.

Referring to Figure 5, there is shown a map of the noise data points of the present invention. As shown in Figure 5, the data points marked by the circle are noise and can be removed by the measurement software.

Referring to step S13 of FIG. 1, the blast furnace level measurement data is smoothed to calculate the material layer volume. Since the data obtained by the measurement of the present invention is the material depth, which is not a continuous distribution, the present invention adopts a smoothing process to process two adjacent measurement values in a third-order smooth line manner, and the third-order smooth line formula is as follows :yi(x)=c1(x-xi) ³ +c2(x-xi) ² +c3(x-xi)+c4 (1)

In equation (1), x is the horizontal distance between the predicted point and the heart line, xi is the horizontal distance of the i interval measurement from the core, y is the vertical distance between the predicted point and the core line, and c1-c4 is a polynomial a parameter, and i represents each interval to be interpolated, and the parameters satisfy the following conditions: (1) passing the polynomial through the measured values at both ends of the interval; and (2) the adjacent two polynomials at the common endpoint The slope and curvature must be the same.

After smoothing, a set of cubic polynomials will be returned between the two measurement points, which will be the trend line of the material.

Fig. 6 is a view showing a comparison of (a) and (b) before the smoothing treatment of the coke layer measurement results of the present invention. Fig. 7 is a view showing a comparison of (a) and (b) before the smoothing treatment of the iron ore layer (iron-containing raw material layer) of the present invention. As shown in Fig. 6 and Fig. 7, after the measurement results are smoothed, the distribution trend of the material surface can be clearly displayed.

In addition, in this step, the present invention assumes that the material surface of the furnace is symmetrical, and divides the material layer from the core to the furnace wall into a plurality of equidistant belts, and calculates the layer through the circumferential integration of the belts. volume. Preferably, the number of the loops is 200.

Figure 8 is a graph showing the calculated ratio of the coal-to-focus ratio calculated by the present invention. Referring to step S14 and FIG. 8 of FIG. 1 , the distribution of the coke ratio R _i is calculated by using the weight of each batch and the volume of the layer. The calculation formula of the coke ratio R _i is as follows: R _i =Wo _i /Wc _i

Wo _i =Vo _i /Vo×Wo

Wc _i =Vc _i /Vc×Wc

Among them, Wo _i and Wc _i are the calculated weights of iron-containing raw materials and coke on the i-ring, respectively, and Vo _i and Vc _i are the calculated values of the volume of iron-containing raw materials and coke on the i-ring, respectively, and Vo and Vc are respectively included. The calculated total volume of iron feedstock and coke, Wo and Wc are the feed weights of the iron-containing feedstock and coke, respectively.

In this step, the distribution ratio of the deposit can be instantly displayed by a display device.

The invention can accurately and instantaneously calculate the distribution of the coke ratio of each batch of feed by removing the noise data in the blast furnace material surface measurement data and smoothing the blast furnace material surface measurement data, thereby further improving the blast furnace cloth distribution. Operation to increase blast furnace production efficiency under stable furnace conditions.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the scope of the present invention. The scope of the invention should be as set forth in the appended claims.

Claims (7)

A method for obtaining a distribution ratio of a coal seam after a blast furnace feed comprises the steps of: (a) obtaining a blast furnace level measurement data; and (b) removing noise data in the blast furnace level measurement data, The noise data is a data point with a slope higher than 42° on the slope of the material; (c) smoothing the measurement data of the blast furnace surface, and dividing the material layer from the core to the furnace wall into a plurality of equidistant rings And calculating the output layer volume through the circumferential integration of the zones; and (d) calculating the ratio of the coke ratio by using the weight of each batch of the blank and the volume of the layer, and the calculation formula of the ratio of the coke ratio R _i is as follows: R _i =Wo _i /Wc _i Wo _i =Vo _i /Vo×Wo Wc _i =Vc _i /Vc×Wc where Wo _i and Wc _i are the calculated weights of the iron-containing raw material and coke on the i-ring, respectively, Vo _i and Vc _i are the calculated volume values of the iron-containing raw material and coke on the i-ring, respectively, and Vo and Vc are the calculated values of the total volume of the iron-containing raw material and the coke, respectively, and Wo and Wc are the weights of the iron-containing raw material and the coke, respectively. The method of claim 1, wherein the blast furnace level measurement data of the step (a) comprises material layer thickness distribution data. The method of claim 2, wherein the material layer thickness is obtained after the blast furnace is fed The measuring time of the degree distribution data is based on the following feeding process signals: (a1) the airtight valve under the silo is opened; (a2) the airtight valve is opened under the silo; (a3) the flotation flow control valve is opened; (a4) () starting the feeding; (a5) the residual weight of the silo is less than 2.5 tons; (a6) determining whether the time is greater than 143 seconds; (a7) the flotation flow control valve is closed; (a8) the closed position of the airtight valve under the silo; (a9) End the feeding. The method of claim 3, wherein the measurement of the thickness distribution data of the blast furnace is performed, wherein the measurement time of the thickness distribution data of the material layer is measured when the signal of (a1) is received, so as to obtain the distribution of the surface before the feeding. Data, and the surface measurement is performed when the (a5) signal appears to obtain the thickness distribution data of the finished material. The method of claim 1, wherein the smoothing process in the step (c) comprises processing the two adjacent measured values in a third-order smooth line manner, the third order The smooth line formula is as follows: yi(x)=c1(x-xi) ³ +c2(x-xi) ² +c3(x-xi)+c4 where x is the horizontal distance between the predicted point and the heart line, xi For the horizontal distance of the i interval measurement from the core, y is the vertical distance between the predicted point and the core line, c1-c4 is a polynomial parameter, and i represents each interval to be interpolated, and the parameters satisfy the following Conditions: (1) The polynomial is passed through the measured values at both ends of the interval; and (2) the slopes and curvatures of the adjacent two polynomials at the common endpoint must be identical. The method of claim 1, wherein the number of the belts is 200 after the blast furnace is fed. The method of claim 1, wherein the step (d) comprises displaying the ratio of the coal to the coke by a display device.