TWI576436B - Method for estimating thickness of furnace and cooling system using the same - Google Patents

Description

Cooling system and method for measuring the thickness of blast furnace stave

This invention relates to a cooling system, and more particularly to a method of measuring the thickness of a blast furnace stave and a cooling system using the same.

The copper stave is the most commonly used cooling system for blast furnaces in recent years. The main reason is that copper has good heat transfer. It can quickly cool the iron slag on the stave, form a protective film to protect the stave, extend the life of the stave, and extend Blast furnace life. However, due to various factors, the copper stave will wear out after a period of use, and even wear out to cause water leakage. Therefore, it is necessary to measure the thickness of the copper stave in the cooling system.

One conventional measurement method is the ultrasonic thickness measurement method. This method requires the installation of an ultrasonic sensor on the stave, and in some applications it is necessary to dig the refractory layer outside the stave and the shell. In addition, such an approach needs to wait until the blast furnace stops operating, and the temperature affects the accuracy of the ultrasonic sensor. Alternatively, another method of measuring is to install a copper rod on the stave, and the rod can be taken out when the blast furnace is stopped. However, this practice also requires drilling holes in the stave and in the blast furnace. After a long period of operation, the copper rod may not be able to be extracted due to heat deformation. In addition, this measurement method requires prior knowledge of where it may be worn. Both of the above practices have many limitations and are not easy to implement.

The present invention provides a method for measuring the thickness of a blast furnace stave and a cooling system using the same.

An embodiment of the invention provides a method for measuring the thickness of a blast furnace stave, wherein the temperature sensor is disposed in the stave. The measuring method comprises: obtaining a plurality of temperature information through a temperature sensor; converting the temperature information into an evaluation value; determining whether the evaluation value meets a critical condition; updating the accumulated value if the evaluation value meets the critical condition; and issuing a warning according to the accumulated value .

In an embodiment, the step of converting the temperature information into the evaluation value comprises: obtaining at least one statistical value of the temperature information; and inputting the statistical value to the linear function to obtain the evaluation value.

In an embodiment, the step of determining whether the evaluation value meets the critical condition comprises: determining whether the evaluation value is greater than a threshold value; and if the evaluation value is greater than the threshold value, determining that the evaluation value meets the critical condition. Further, the above step of updating the accumulated value is to increase the accumulated value.

In an embodiment, the step of issuing a warning according to the accumulated value comprises: determining whether the accumulated value is greater than a regulatory value; and issuing a warning if the accumulated value is greater than the regulatory value.

An embodiment of the invention provides a cooling system including a blast furnace, a temperature sensor, and a measurement module. The blast furnace has a stave and the temperature sensor is disposed in the stave. Measuring module is used to sense the temperature The detector takes multiple temperature information and converts the temperature information into an evaluation value. The measurement module is also used to judge whether the evaluation value meets the critical condition, update the accumulated value when the evaluation value meets the critical condition, and issue a warning according to the accumulated value.

In one embodiment, the measurement module is configured to obtain at least one statistical value of the temperature information, and input the statistical value to a linear function to obtain the evaluation value.

In an embodiment, the measuring module is configured to determine whether the evaluation value is greater than a threshold value. If the evaluation value is greater than the threshold value, the measurement module determines that the evaluation value meets the critical condition. In addition, if the evaluation value meets the critical condition, the measurement module is used to increase the cumulative value.

In an embodiment, the measuring module is configured to determine whether the accumulated value is greater than a regulatory value, and issue a warning when the accumulated value is greater than the regulatory value.

The above described features and advantages of the invention will be apparent from the following description.

100‧‧‧ cooling system

110‧‧‧Blast Furnace

111‧‧‧Cooling wall

112‧‧‧ refractory layer

113‧‧‧ furnace wall

120‧‧‧temperature sensor

130‧‧‧Measurement module

140‧‧‧Perforation

141‧‧‧Measurement points

210, 220‧‧‧ Curve

S301~S305‧‧‧Steps

1 is a schematic diagram showing a cooling system according to an embodiment; FIG. 2 is a schematic diagram showing a relationship between a thickness of a cooling wall and an accumulated value according to an embodiment; and FIG. 3 is a diagram showing an amount of thickness of a cooling wall according to an embodiment. Flow chart of the test method.

1 is a schematic diagram showing a cooling system in accordance with an embodiment. Referring to FIG. 1 , the cooling system 100 includes at least a blast furnace 110 , a temperature sensor 120 , and a measurement module 130 . The blast furnace 110 has a cooling wall 111, a refractory material layer 112, and a furnace shell 113. In this embodiment, perforations 140 are provided at a plurality of locations of the blast furnace 110, and a temperature sensor 120 is disposed in the perforations 140 for taking the temperature at the measurement point 141. It should be noted that the temperature sensor 120 and the through hole 140 are originally disposed in the blast furnace 110, and in this embodiment, it is not necessary to additionally dig the refractory layer 112 and the furnace shell 113. In addition, the blast furnace 110 and the temperature sensor 120 in FIG. 1 are merely an example, and the present invention does not limit the type and shape of the blast furnace 110 and the temperature sensor 120, nor does it limit the cooling wall 111, the refractory material layer 112, and the furnace. The material of the shell 113. The measurement method proposed in the present embodiment can be performed as long as the temperature sensor 120 is disposed in the cooling wall 111.

The measurement module 130 is configured to perform the measurement method proposed in the embodiment. However, the measurement module 130 can be implemented as a software or a hardware, and the present invention is not limited thereto. Specifically, the measurement module 130 first obtains multiple pieces of temperature information through the temperature sensor 120. For example, these temperature information is a value in degrees k, but the invention does not limit the unit of temperature information. Next, the measurement module 130 converts the temperature information into an evaluation value that is associated with the thickness (either positive or negative). For example, the measurement module 130 may first calculate one or more statistical values of the temperature information, such as a maximum value, a minimum value, a median, an average value, a standard deviation, a square sum, or a combination thereof, and the present invention Not limited to this. Next, the measurement module 130 inputs the one or more statistical values into an equation to take The evaluation value is obtained. In this embodiment, the equation is a linear equation used to multiply each statistic by a weight and then add. However, in other embodiments, the equation may also be a polynomial, an exponential function, a logarithmic function, or other non-linear equation.

In the above embodiment, the measurement module 130 converts the temperature information into an evaluation value according to a statistical value and an equation. However, in another embodiment, the measurement module 130 can also collect the thickness and temperature information of the cooling wall to perform a machine learning algorithm to obtain a trained module, and the measurement module 130 can set the temperature information. As an input to this module and take the output of the module as an evaluation value. The machine learning algorithm can be a decision tree, a neural network, a support vector machine or other algorithms, and the invention is not limited thereto.

In general, the thinner the thickness of the stave 111, the greater the temperature sensed by the temperature sensor 120 and the less fixed. Those of ordinary skill in the art can design a wide variety of transfer functions based on such phenomena. The invention does not limit how to convert temperature information into an evaluation value.

Next, the measurement module 130 determines whether the evaluation value meets a critical condition. For example, in this embodiment, if the evaluation value is larger, the thickness of the cooling wall 111 is thinner, the measurement module 130 determines whether the evaluation value is greater than a threshold value, and if the evaluation value is greater than the threshold value, the evaluation value meets the critical value. condition. However, since the evaluation value can be converted in many different ways, in another embodiment, the evaluation value can also be judged to meet the critical condition when the evaluation value is less than the threshold value. Alternatively, the critical condition may also be set to divide the value range of the evaluation value into a plurality of intervals, if the evaluation value falls on a certain special The determined interval judges that the evaluation value meets the critical condition, and the present invention does not limit the content of the critical condition.

If the evaluation value meets the critical condition, the measurement module 130 updates an accumulated value; if the evaluation value does not meet the critical condition, the measurement module 130 maintains the accumulated value. For example, if the evaluation value meets the critical condition, the measurement module 130 increases the cumulative value (eg, plus one). In this embodiment, the measurement module 130 determines whether to update the accumulated value at intervals, in other words, the cumulative value represents the number of times the evaluation value has met the critical condition. However, in other embodiments, the measurement module 130 may also reduce the accumulated value after the evaluation value meets the critical condition, and the present invention is not limited thereto.

Next, the measurement module 130 issues a warning based on the accumulated value. For example, the measurement module 130 can determine whether the accumulated value is greater than a regulatory value, and the measurement module 130 issues a warning if the accumulated value is greater than the regulatory value.

2 is a schematic diagram showing the relationship between the thickness of the cooling wall and the cumulative value, wherein the horizontal axis is time and the vertical axis is an integrated value, according to an embodiment. In the embodiment of Fig. 2, the temperature information changes over time, and the evaluation value also changes with time. The larger the evaluation value, the thinner the thickness of the stave, and the cumulative value represents the number of times the evaluation value has been greater than the critical value. Curve 210 represents the cumulative value and curve 220 represents the thickness of the stave. As can be seen from Fig. 2, the curve 210 and the curve 220 basically exhibit opposite trends, so when the accumulated value is larger than a certain value (set to the regulatory value), the thickness of the stave is already too small, and a warning must be issued. In an embodiment, the measurement module 130 can also convert the accumulated value according to the relationship between the curves 210 and 220. To cool the thickness of the wall, and present the thickness of the stave to the manager of the cooling system 100. Based on this, the management can change the operation strategy or perform other measures in advance to avoid water leakage on the cooling wall.

3 is a flow chart showing a method of measuring the thickness of a stave according to an embodiment. Referring to FIG. 3, in step S301, a plurality of temperature information is acquired through the temperature sensor. In step S302, the temperature information is converted into an evaluation value. In step S303, it is judged whether or not the evaluation value meets the critical condition. If the evaluation value meets the critical condition, the accumulated value is updated in step S304. In step S305, a warning is issued based on the accumulated value. If it is judged in step S303 that the evaluation value does not satisfy the critical condition, it returns to step S301. However, the steps in FIG. 3 have been described in detail above, and will not be described again here. It should be noted that the steps in FIG. 3 can be implemented as multiple code codes or circuits, and the present invention is not limited thereto. In addition, the method of FIG. 3 can be used in conjunction with the above embodiments, or can be used alone.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

S301~S305‧‧‧Steps

Claims (6)

A method for measuring the thickness of a blast furnace stave, wherein a temperature sensor is disposed in the stave, the measuring method includes: obtaining, by the temperature sensor, a plurality of temperature information that changes with time; and the temperature information Converting to an evaluation value, wherein the evaluation value is associated with the thickness of the stave; determining whether the evaluation value meets a critical condition; if the evaluation value meets the critical condition, adding an accumulated value; determining whether the accumulated value is greater than a control a value; and if the accumulated value is greater than the regulatory value, a warning is issued. The measuring method of claim 1, wherein the converting the temperature information into the evaluation value comprises: obtaining at least one statistical value of the temperature information, wherein the at least one statistical value comprises a maximum value, a minimum value, a median, mean, standard deviation, sum of squares, or a combination thereof; and inputting the at least one statistical value to a linear function to obtain the evaluation value. The measuring method of claim 1, wherein the step of determining whether the evaluation value meets a critical condition comprises: determining whether the evaluation value is greater than a threshold value; and if the evaluation value is greater than the threshold value, determining that the evaluation value is consistent The critical condition. A cooling system for measuring a blast furnace stave includes: a blast furnace having a stave; a temperature sensor disposed in the stave; and a measuring module for transmitting the temperature sensor Obtaining a plurality of temperature information that changes over time, converting the temperature information into an evaluation value, wherein the evaluation value is associated with a thickness of the cooling wall, and the measurement module determines whether the evaluation value meets a critical condition, When the evaluation value meets the critical condition, an accumulated value is updated, and it is determined whether the accumulated value is greater than a regulatory value. If the accumulated value is greater than the regulatory value, the measuring module issues a warning. The cooling system of claim 4, wherein the measurement module is configured to obtain at least one statistical value of the temperature information, wherein the at least one statistical value comprises a maximum value, a minimum value, a median, an average value, and a standard value. A difference, a sum of squares, or a combination thereof, and inputting the at least one statistical value to a linear function to obtain the evaluation value. The cooling system of claim 4, wherein the measurement module is configured to determine whether the evaluation value is greater than a threshold value, and if the evaluation value is greater than the threshold value, the measurement module determines that the evaluation value meets the critical condition .