TWI506140B - A Method for Evaluating the Pre - Drilling Size of a New Furnace in a New Blast Furnace - Google Patents

Description

Method for evaluating the pre-drilling size of the blast furnace new furnace

The invention relates to a method for evaluating the pre-drilling size of a new furnace of a blast furnace (Blast Furnace, BF), in particular to a method for evaluating the pre-drilling size of a new furnace of a blast furnace by numerical simulation.

Modern blast furnace smelting is a continuous production process that reduces iron ore to pig iron. The solid raw materials such as iron ore, coke and flux are fed into the blast furnace in batches according to the specified batching ratio by the top charging device, and the surface of the throat is maintained at a certain height. Coke and ore form alternating layers in the furnace. The ore material is gradually reduced, melted into iron and slag during the descending process, and is collected in the hearth and periodically discharged from the tap hole and the slag port.

In addition, according to previous research and analysis, the taphole temperature distribution of the blast furnace is one of the important indexes of tapping, and the temperature distribution of the taphole can be controlled by the pre-drilling aperture. However, according to the experience of the applicant in the case of Sinosteel's operation of its four blast furnaces, the pre-drilling size of the blast furnace new furnace generation tapping port is provided by the blast furnace equipment manufacturer according to the processing practice of different blast furnaces over the years. Without any theoretical basis, it is necessary to find a solution.

Accordingly, it is an object of the present invention to provide a method for assessing the size of a pre-drilled hole in a new furnace of a blast furnace.

Therefore, the method for evaluating the pre-drilled size of the tapping port of the blast furnace new furnace comprises the following steps: (A) modeling a carbon brick near a taphole of a blast furnace to generate a numerical model of the taphole; (B) performing numerical simulation analysis of the temperature of the carbon brick near the taphole according to a plurality of different pre-drilled sizes of the taphole numerical model to obtain a taphole pipe representing the size of the pre-drilled holes a plurality of taphole center temperature profiles of the relationship between the center temperature and the depth of the taphole outlet in the taphole pipe; and (C) the outflow of each of the temperature profiles obtained in the step (B) The data of the low temperature zone of the iron mouth pipe obtains an adaptation curve representing the relationship between the center temperature of the taphole pipe and the pre-drilled hole size in the low temperature zone of the taphole pipe.

The effect of the invention is that, by means of numerical simulation analysis, an adaptation curve representing the relationship between the center temperature of the taphole pipe and the pre-drilled hole size in the low temperature zone of the taphole pipe can be obtained to provide the tapping of the spot blast furnace. Reference information for the selection of the port pre-drill size.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments.

Referring to Figures 1 to 4, a preferred embodiment of the method for estimating the pre-drilled size of a new furnace of a blast furnace is provided by numerical simulation to provide a pre-drilled size of a blast furnace (not shown). . First, as shown in step 11 of FIG. 1 and FIG. 2, before the furnace operation of the new furnace of the blast furnace is performed, the size of the carbon brick and the refractory material near the tap hole of the blast furnace is modeled to generate a The iron outlet numerical model 2 is shown in Figure 2. The taphole numerical model 2 includes a carbon brick area 21, a mud area 22, a solid pool area 23, and a shell area 24, and 2 includes a Carbon Brick area 21, a Muscle area 22, a Spool area 23, and a Shell area 24, and as shown in FIG. In the following description of the embodiment of the invention, the horizontal position at the exit of the molten iron is the depth = 0, and the horizontal position at the inlet of the molten iron is the maximum depth of the tap.

Next, as shown in step 12, numerical simulation analysis of the temperature of the carbon brick near the taphole is performed according to a plurality of different pre-drill sizes of the taphole numerical model 2 to obtain an output representing different pre-drill sizes. The temperature distribution curve of the center of the tapholes between the center temperature of the iron pipe and the depth of the taphole outlet in the taphole pipe. As shown in FIG. 3, in the preferred embodiment of the present invention, the numerical model 2 of the taphole of the No. 1 blast furnace of the Sinosteel is in the pre-drilling size of 100 mm, the pre-drilled size of 150 mm, and the pre-drilled size of 300 mm. In the case of pre-drilling, a numerical simulation analysis of the temperature of the carbon brick near the taphole in a predetermined time interval (2 hours as shown in Fig. 3) after completion of the mud blocking operation is performed to obtain representative of the differences The temperature distribution curve of the center of the taphole in the relationship between the center temperature of the taphole pipe and the depth of the taphole outlet in the taphole size, wherein after the plugging is completed, the outflow of Fig. 2 The iron pipe will be muddy. In addition, in Figure 3, the actual measurement data of the iron taps of No. 2, No. 3, and No. 4 blast furnaces are also indicated by four hollow symbols (○, □, △, ◇), where ○ and □ indicate Sinosteel No. 2 The two actual measurement data of the blast furnace tapping port, △ indicates the actual measured data of the tapping port of No. 3 blast furnace of Sinosteel, and ◇ indicates the actual measured data of the tapping port of No. 4 blast furnace of Sinosteel. If we analyze the No. 1 blast furnace of Sinosteel, we can find that the temperature in the low temperature zone of the taphole pipe in the solid pool area 23 will gradually increase with the increase of the pre-drilled hole diameter. Rise. Furthermore, the Governing Equation and the Boundary Condition which must be constructed before the numerical simulation analysis in the embodiment of the present invention can be easily established by those who are aware of the numerical simulation analysis of the project. Therefore, we do not need to repeat them here.

Then, as shown in step 13, with the No. 1 blast furnace of the 99/5 medium steel, the lowest temperature data of the low temperature zone of the taphole pipe according to each temperature distribution curve obtained in step 12 (ie, 100 mm for the pre-drilled hole) , the pre-drilled 150mm and pre-drilled 300mm and other iron outlet center temperature distribution curves, the minimum temperature is T ₁₀₀ , T ₁₅₀ and T _{300 respectively} , can obtain the taphole pipe center representing the low temperature zone of the taphole pipe An adaptation curve of the relationship between temperature and pre-drilled size, as shown in Figure 4, wherein the adaptation curve is derived from the temperature distribution curves of Figure 3 using a curve-fitting method. The lowest temperature data of the low temperature zone of the mouth pipe (i.e., (100, T ₁₀₀ ), (150, T ₁₅₀ ) and (300, T ₃₀₀ ) in Fig. 4).

Then, according to the desired temperature of the low temperature zone of the iron outlet pipe which is desired when the blast furnace is opened, the corresponding required pre-drilling size can be obtained from the adaptation curve in Fig. 3 for pre-drilling of the blast furnace operation site. . For example, as can be seen from Figure 4, although increasing the diameter of the pre-drilled hole will increase the temperature of the low-temperature zone of the iron-mouth pipe, its correlation is not linear. When the diameter of the drill hole reaches 200mm, the temperature will increase by more than 700 °C, and then the temperature rises very slowly. Therefore, in order to ensure the temperature of the taphole pipe and the heat transfer of the carbon brick, the low temperature zone of the taphole pipe of No. 1 blast furnace of Sinosteel is required. The temperature can be set to 700 ° C, and according to the adaptation curve, the corresponding required pre-drilled size is 200 mm.

In summary, the present invention evaluates the pre-drilling size of the taphole of the new furnace of the blast furnace. The method is to obtain an adaptation curve representing the relationship between the center temperature of the taphole pipe and the pre-drilled hole size in the low temperature zone of the iron pipe by numerical simulation analysis, so as to select the pre-drilling size of the blast furnace tap hole. With reference to the information, it is indeed possible to achieve the object of the present invention.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

11‧‧‧ Establishing a numerical model for the iron outlet

12‧‧‧ According to the different pre-drilling sizes of the numerical model of the taphole, the numerical simulation analysis of the temperature of the carbon brick near the taphole is carried out to obtain the temperature and tapping of the tapping pipe center representing the different pre-drilled sizes. Temperature distribution curve of multiple taphole centers in the relationship between the depth of the taphole outlet and the depth of the taphole outlet

13‧‧‧Low temperature of the taphole pipe according to the temperature distribution curve Zone data, obtain an adaptation curve representing the relationship between the center temperature of the taphole pipe and the pre-drilled hole size representing the low temperature zone of the taphole pipe

14‧‧‧Actain the required pre-drill size according to the adaptation curve and the required temperature in the low temperature zone of the taphole pipe

2‧‧‧Iron numerical model

21‧‧‧Carbon area

22‧‧‧The mud pack area

23‧‧‧ solid pool area

24‧‧‧Shear area

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart showing a preferred embodiment of the present invention for evaluating the size of a pre-drilled hole in a new furnace of a blast furnace; Figure 2 is a schematic view showing the blast furnace being formed in the preferred embodiment of the present invention. Iron port numerical model; FIG. 3 is a diagram illustrating a numerical simulation analysis of the temperature of the carbon brick near the tap hole according to the numerical model of the taphole in the preferred embodiment of the present invention, and the obtained pre-drilled holes are represented The core outlet temperature profile of the relationship between the center temperature of the taphole pipe and the depth of the taphole outlet in the taphole pipe; and FIG. 4 is a diagram illustrating a preferred embodiment of the present invention The minimum temperature data of the low temperature zone of the taphole pipe of each temperature distribution curve in Fig. 3, the obtained adaptation of the relationship between the center temperature of the taphole pipe and the pre-drilled size representing the low temperature zone of the taphole pipe curve.

11. . . Establish a numerical model of the iron mouth

12. . . According to the different pre-drilling sizes of the numerical model of the taphole, the numerical simulation analysis of the temperature of the carbon brick near the taphole is carried out to obtain the center temperature of the taphole pipe and the distance of the taphole pipe representing different pre-drilled sizes. Temperature distribution curve of multiple tapholes at the depth of the outlet of the taphole

13. . . According to the low temperature zone data of the taphole pipe of the temperature distribution curve, an adaptation curve representing the relationship between the center temperature of the taphole pipe and the pre-drilled hole size representing the low temperature zone of the taphole pipe is obtained.

14. . . Obtain the required pre-drill size according to the adaptation curve and the required temperature in the low temperature zone of the taphole pipe

Claims (7)

A method for evaluating the size of a pre-drilled hole of a new furnace of a blast furnace comprises the following steps: (A) modeling a carbon brick near a taphole of a blast furnace to generate a numerical model of the taphole; (B) According to the plurality of different pre-drilled holes of the numerical model of the taphole, numerical simulation analysis of the temperature of the carbon brick near the taphole is performed to obtain a center temperature of the taphole pipe representing the size of the pre-drilled holes a plurality of taphole center temperature profiles in relation to the depth of the taphole outlet in the taphole pipe; and (C) tapping ports according to each of the temperature profiles obtained in the step (B) The pipeline low temperature zone data obtains an adaptation curve representing the relationship between the center temperature of the taphole pipe and the pre-drilled hole size in the low temperature zone of the taphole pipe. A method for evaluating a pre-drilled hole size of a blast furnace new furnace according to claim 1 of the scope of the patent application, wherein in the step (B), the different pre-drilled holes are based on the numerical model of the taphole Dimensional, numerical simulation analysis of the temperature of the carbon brick near the taphole in a predetermined time interval after the completion of the mud blocking operation, to obtain the center temperature of the taphole pipe and the taphole representing the size of the pre-drilled holes The temperature distribution curve of the center of the taphole in the relationship between the depth of the taphole outlet in the duct. The method for estimating the size of the pre-drilled hole of the blast furnace new furnace according to the second aspect of the patent application, wherein the predetermined time interval is 2 hours. Evaluation of the new furnace of the blast furnace according to the scope of claim 1 The method of pre-drilling size, wherein in the step (C), the curve is obtained by using a curve fitting method from the low temperature zone data of the taphole pipe of each temperature distribution curve. A method for evaluating a pre-drilled hole size of a blast furnace new furnace according to claim 1 of the scope of the patent application, wherein in the step (C), each temperature distribution curve obtained in the step (B) is The lowest temperature data of the low temperature zone of the taphole pipe obtains the adaptation curve representing the relationship between the center temperature of the taphole pipe and the pre-drilled hole size in the low temperature zone of the taphole pipe. The method for evaluating the pre-drilled hole size of the blast furnace new furnace according to the scope of claim 1 further includes a step (D) after the step (C), according to the fitting curve and a tapping iron The required temperature in the low temperature zone of the pipe is obtained to obtain a required pre-drill size. According to the method of claim 6, the method for evaluating the pre-drilled size of the tap furnace of the new furnace of the blast furnace, wherein the temperature required for the low temperature zone of the taphole pipe is 700 ° C, and the required pre-drilled hole size is 200 mm. .