KR20080032331A - Apparatus for measuring realtime temperature of continuous in steel manufacture ladle - Google Patents

Abstract

An apparatus for measuring real-time temperature in a ladle is provided to reduce a probe and additives for controlling molten steel temperature by using information on real-time molten steel temperature and empty ladle temperature measurement. An apparatus for measuring real-time temperature in a ladle comprises a continuous temperature measuring device. The continuous temperature measuring device converts real-time analog temperature data according to the temperature of molten steel(9) inside the ladle or an empty ladle into a digital signal.

Description

Apparatus for measuring realtime temperature of continuous in Steel Manufacture Ladle}

1 is a flow chart of a general steelmaking secondary refining process

2 is a schematic diagram of a temperature measuring device in a steelmaking ladle according to the prior art;

3 is a schematic diagram of a molten steel continuous measurement apparatus in the steelmaking ladle according to the present invention

FIG. 4 is a detailed configuration diagram of a continuous measuring device mounted to a sidewall of a steel ladle for real-time temperature measurement according to the present invention of FIG. 3.

<Explanation of symbols for the main parts of the drawings>

8: ladle refractory 8a: ladle inflow agent 8b: ladle permanent field

8c: Ladle Semi-Permanent Stadium 8d: Ladle Barrel 9: Molten Steel

9a: slag 9b: porous plug 11: continuous measuring device

11a: temperature sensor 11b: inner primary protective tube 11c: inner secondary protective tube

11d: internal guide pipe 11e: intermediate guide pipe 11f: external guide pipe

11g: guide tube support 11h: guide tube fixing screw 11i: protective tube connection adhesive

12 Temperature Compensation Lead 13 Temperature / Signal Converter 14 Wireless Transmitter

15: temperature sensor protector 16: battery

The present invention relates to a real-time temperature continuous measurement apparatus in a steel mill ladle, ladle side integrated temperature measuring apparatus for continuous measurement of molten steel temperature; In order to measure the temperature of the molten steel contact area for measuring the molten steel temperature inside the ladle and the ambient atmosphere temperature of the ladle, it is possible to continuously measure the molten steel temperature (1550 ~ 1680 ℃) of the high temperature inside the ladle to convert the steel mill to The present invention relates to a real-time temperature continuous measuring device in a ladle that can be used in process operations.

In the conventional steelmaking secondary refining process, as shown in FIG. 1, when molten steel is pulled out from the converter process S10 to the ladle, the stirring operation is performed through a B / S (Bubbling Stand-S20) process, and a work instruction for each product is provided. Accordingly, the LF process (S30), the RH process (S40), the VTD process (S50) and enters the playing process (S60).

In the B / S (Bubbling Stand: S20) process, stirring is performed to improve molten steel cleanliness.

Next, in the LF process (S30), the ferrous alloy input control for the molten steel component control and the coolant input control for the molten steel temperature control are performed, and the cleanliness of the molten steel is improved by stirring the upper portion of the molten steel using the Top Bubbling Lance. Mainly do it. In particular, it is a step of mainly heating the molten steel by heating a three-phase high voltage of 6600 [V] to the slag layer.

Next, the RH process (S40) aims to remove impurities in the molten steel by maintaining a very low vacuum (0mb). In particular, the temperature raising method of the RH process uses a method of injecting oxygen into the molten steel while simultaneously injecting aluminum to induce a temperature raising reaction to increase the temperature in the molten steel.

Next, the VTD process (S50) puts the entire ladle in the tank and then removes impurities in the molten steel in a low vacuum state to produce a high clean steel. After the secondary refining process, the molten steel is moved to the trolley or crane to the playing process (S60), the molten steel is injected into the playing tundish (TUNDISH) through the lower ladle nozzle, and then transferred to the converter process in the empty ladle state. do.

Secondary refining process with this process is the core equipment to make high-grade clean steel, the composition and temperature adjustment is indispensable for the optimal refining work to meet the demand demand.

FIG. 2 is a schematic diagram of a temperature measuring device according to the related art, in which a temperature is measured using a disposable probe at the upper part of a ladle, and a conventional temperature measuring device includes a temperature measuring sampling device 1 equipped with a temperature measuring probe 1a. It is configured to measure and analyze the temperature of the sample in the receiving ladle (8). That is, when the probe 1a is deposited in the molten steel 9 in the steel ladle 8 in the refining process, electromotive force is generated in the RTD sampling device 1, and the electromotive force is passed through the RTC 2. It is transmitted to PLC: 3) and can be used as data for temperature calculation, and the measured temperature data is transferred to computer 4 to display the molten steel temperature through the monitoring screen 5 for field operation. It can be known discontinuously. The main controller 3 is connected to a probe detachment apparatus 6, an auxiliary controller 7, and the like. As described above, in the process of refining molten steel in the steel ladle 8, the temperature is measured by using a probe to measure the temperature of the molten steel, and the input amount of the coolant or the heating material is determined based on the measured temperature. do.

However, in the conventional temperature measuring device as described above, the molten steel of the steel ladle 8 includes numerous operating variables such as various metallurgical reactions through slag removal and process waiting process from the converter to the secondary refining process. In order to discontinuously recognize the temperature at the time of measurement of the molten steel temperature value in the middle ladle, it is not only inconvenient to measure each time until the desired temperature value is obtained by using an expensive probe for measuring temperature, but also a temperature measuring probe. The production cost burden and the delay of the operation during the measuring time caused by the use occurs, which causes the productivity to drop.

In addition, the empty ladle after the casting work in the playing process is moved to a separate repair site, and the refractories are rebuilt or reused by determining whether to repair or reuse by inspecting the refractory inside the ladle and the nozzles mounted on the lower part. After the inspection and repair, the ladle is moved to the mobile truck, and the molten steel that has been refined in the converter is transferred to the ladle and moved to the post-process. At this time, when refining molten steel in the converter, the refining work must be completed according to the appropriate molten steel temperature required in the secondary refining process, and the molten steel temperature is lowered by the cooled ladle when the refining molten steel is dropped on the ladle. Before finishing the work, the cooling condition of the common ladle is checked in advance and the refining work is finished by slightly increasing the molten steel temperature in consideration of the drop in the molten steel temperature.

Meanwhile, the number of ladles must be large enough for the continuous work of the converter and the playing process and the ladle repair and inspection. Therefore, if the temperature of the refractory in the ladle is cooled for a long time in the ladle atmosphere, the waiting time of each ladle is not constant, and the time for keeping the ladle re-built with new refractory in the drying burner is also different, and also in the ladle Depending on the degree of adhesion of the slag and now, the temperature change of the ladle is severe.

In this situation, in order to check the temperature of the ladle, when the ladle is moved to the lower part of the converter, the operator checks the ladle refractory temperature by visually checking the inside of the ladle. Due to the error between workers who are notified and the error between refiners notified and the temperature determination of inaccurate air, the secondary refining is not able to perform normal processing work or a separate process for adjusting the temperature, namely heating or cooling work is occurring. There are problems such as delay of time, deterioration of quality of molten steel and cost increase due to the addition of additives, and the occurrence of workload by manual labor and automation.

The present invention is to solve the above problems, the present invention is to install the temperature sensor, the temperature sensor protection tube and the inner / outer induction pipe integrally on the ladle side to hold the temperature and ladle of the molten steel contained in the ladle. Continuously measuring the temperature of the field and making the result available to the converter process, the secondary refining process, and the playing process operator through the temperature / signal converter, so that the temperature of the ladles waiting for the tapping in the converter process cannot be recognized. Difficulties hitting the target temperature at the time point, operation delay due to the use of one-time probe in the secondary refining process (two minutes / one time), and cost increase factors caused by the use of one-time probe It is possible to solve the problem that it is difficult for the operator to change the ladle destination according to the molten steel temperature drop when the air is generated during ladle movement in the playing process The molten steel temperature is the real time temperature object to provide a continuous measurement device in a ladle that can be hit by the temperature in the initial operation by the real-time monitoring prevent degradation of the molten steel.

A feature of the present invention for achieving the above object is a continuous temperature measuring device for converting a real-time analogue temperature measurement data according to the temperature of molten steel and steel in the ladle into a digital signal in the temperature measuring device in the steel ladle It is a real-time temperature continuous measuring device in installed steel ladle.

In the present invention, the continuous measuring device is installed on the side of the ladle main body, it is characterized in that the attachment and detachment is easily configured by installing in the bonding section of the refractory and the inflow agent forming the endothelial of the ladle body.

In the present invention, the continuous temperature measuring device is installed in the main body of the ladle, the temperature measuring module for detecting real-time analogue temperature measurement data according to the temperature of the molten steel and the air in the ladle; A temperature / signal converter for converting the temperature measurement data detected by the temperature measurement module into a corresponding temperature measurement value; And a wireless transmitter converting the temperature measurement value calculated by the temperature / signal converter into a signal that can be transmitted through a wireless network and wirelessly transmitting in real time.

In the present invention, the temperature measurement module is installed through the sidewall of the ladle so that one end is in direct contact with the molten steel, and the temperature sensor for converting the difference between the thermoelectric power difference between the positive electrode and the negative electrode of the thermocouple sensor to a temperature value and outputs the temperature sensor as a whole, Inner and outer primary and secondary protective pipes to the entire body of the sensor to protect the, and a plurality of installed on the outside of the inner and primary secondary protection pipe to prevent the external molten steel outflow by the inner and primary secondary protection tube It may be configured as an induction pipe, and may further comprise an induction pipe support for facilitating installation and separation of the temperature sensor on the side wall of the ladle.

In addition, in the present invention, such a temperature measurement module, the temperature sensor is installed through the iron shell, permanent field, semi-permanent field, inflow agent portion of the ladle body, the inner and secondary protective tube to protect the temperature sensor, and the inner protective tube And a plurality of induction pipes respectively protecting the inner / middle / outside of the induction pipe, and the induction pipe pedestal integrally.

In addition, in the present invention, the temperature measurement module is installed in the direction from the shell to the endothelial, the endothelial to the inflow agent in a manner that is sequentially mounted on the side wall of the ladle, the temperature sensor of the outer skin portion of the ladle is a temperature deviation occurring in a high temperature environment of 100 ℃ or more It may be desirable to configure the continuous measurement to be transmitted to the temperature / signal converter in conjunction with a compensating lead inside the temperature sensor protector to reduce the

In the present invention, the temperature measurement module is composed of a composite ceramic (HPBN: Hot Pressed Boron Nitride, Sialon, Silicon nitride) material in order to prevent oxidation, erosion and thermal shock of the internal primary and secondary protection tubes which are in direct contact with molten steel. The inner primary protective tube is HPSN (Hot Pressed Boron Nitride) with excellent thermal conductivity, and the inner secondary protective tube is made of double Sialon material with excellent corrosion resistance.

The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration of the preferred embodiment of the real-time temperature continuous measuring apparatus in the steelmaking ladle according to the present invention and the resulting effects thereof.

Figure 3 illustrates a preferred embodiment of the real-time temperature continuous measuring device in the steelmaking ladle according to the present invention, the continuous measuring device 11 according to the present invention, the CARBON refractory (8) and alumina-based inflow agent ( Installation at the junction of 8a) is preferable when considering the installation and repair work of the temperature measuring device. The configuration position of the continuous measuring device 11 is configured from the upper end of the ladle to 1.2 [m] lower based on the 300 ton receiving ladle. The reason for this is that, first, when the molten steel is pulled out from the converter, the damage rate of the measuring device due to the molten steel can be reduced than the lower part. Second, the temperature measurement deviation is maintained by measuring the representative temperature by maintaining the temperature measuring position at about 600 [mm] from the upper molten steel. Can be minimized. Third, it is possible to smoothly replace the temperature measuring device in accordance with the brick replacement cycle of the CARBON refractory (8). In addition, the rate of wear of the ladle endothelium due to molten steel is most severe in the direction of play when the converter is pulled out. Therefore, the configuration position of the continuous measuring device 11 will be most preferably installed in the converter direction. As the temperature sensor 11a of the continuous measuring device 11, when the thermocouple is formed at the position of the ladle and the molten steel closest to the ladle, the molten steel temperature is measured continuously (within 1 second). The difference of the thermocouple sensor electromotive force value (MV) measured in this way is connected to the high-temperature compensation conductor 12 and is converted into a temperature value through the temperature / signal converter 13 and transmitted to the outside through a wireless transmitter, thereby allowing an external monitor. Monitoring is possible. This temperature / signal converter 13 is configured inside the temperature sensor protector 15.

4 is a detailed configuration diagram of a continuous measuring device 11 that is inserted into the side wall of the receiving ladle for real-time temperature measurement in the real-time temperature continuous measuring apparatus according to the present invention of FIG. It is constructed integrally between the small, easy to replace refractory 8 brick and the inlet 8a. At this time, in the continuous measuring device 11, the thermocouple temperature sensor 11a having the cathode and the anode wire is configured as B type for high temperature measurement, and the length is composed of 380f in consideration of the thickness of the ladle wall, and the outside of the thermocouple temperature sensor is In order to protect from the environment, the inner primary protective tube 11b made of a composite ceramic material is constituted. In particular, the thickness of the inner primary protective tube is 10 [mm] to prevent the leakage of molten steel and the outer part is made of metal to prevent the deformation of the primary protective tube during thermal contraction and expansion of the external refractory bricks, protective tubes and induction tubes. Configure to The part directly contacting the molten steel is the inner secondary protective tube 11c, which is made of Boron Nitride composite ceramic and alumina refractory material resistant to thermal shock and erosion by molten steel flow.

Next, a sensor inner induction pipe (11d) made of Zircon material, which can support and protect the temperature sensor and the inner and secondary protection tubes, is also in direct contact with molten steel, which has excellent durability and thermal conductivity. It is preferable to comprise with a ceramic material. The sensor inner guide pipe (11d) is a portion that is inserted into the ladle inlet (8a) layer 40mm in length and 270mm in length.

The sensor middle induction pipe (11e) is made of carbon refractory material, the thickness is longer than the ladle permanent field (8b), and the bonding strength can be increased by using mortar when bonding with the inner and outer induction pipes (11d, 11f). Make sure And the outer induction pipe (11f) that is in contact with the iron bar serves to finally support the entire continuous measuring device 11, the thickness is composed of the same length, 30 [mm] as the ladle semi-permanent field (8c). In order to prevent the molten steel from flowing out by pushing the continuous measuring device 11 to the outside of the ladle shell 8d, the guide tube base 11g outside the sensor having a thickness of 30 mm and a width (diameter) of 100 mm has a circular shape. Configure. And the induction pipe support (11g) outside the sensor is fixed using the sensor external induction pipe fixing screw (11h). At this time, it is necessary to check whether the temperature measurement value is normally monitored in the temperature / signal converter 13 before fixing the final fixing screw. The temperature compensation lead 12 is here configured to connect the measured value of the temperature sensor to the temperature / signal converter 13. Temperature compensating wire can be used without any deviation when ambient temperature is below 300 ℃, but the temperature of junction part with temperature sensor should be below 100 ℃ for zero temperature measurement deviation. In order to protect the temperature / signal converter 13 and the temperature compensation lead 12, the temperature sensor protector 15 is configured using a light weight aluminum material.

The present invention configured as described above enables the continuous measurement of the temperature in the molten steel during the secondary refining process after the tapping of the converter process and until the arrival of the playing process, and the temperature of the common steel can be continuously measured after the injection of the molten steel of the molten steel. It works. Referring to the real-time temperature measurement operation and its effect in the ladle of the continuous measuring device as follows.

3 and 4, the thermocouple sensor which is a continuous measuring device 11 capable of measuring the molten steel temperature and the ladle temperature on the side of the steel ladle main body is installed, and measured through the thermocouple. The temperature value is transmitted through the temperature compensating wire 12, which is a high-temperature connection line, converted by the temperature / signal converter 13, and transmitted to the cab through the wireless transmitter 14, so that the operator can utilize it in real time during temperature adjustment work. To be. These temperature measurements allow the target process to be maintained by adjusting the heat mixing and oxygen uptake in consideration of the temperature conditions of the stand-by swimmers in the converter process. In the secondary refining process, the operator can recognize the temperature change due to the input amount of ferroalloy to adjust the components in the molten steel, the temperature drop due to the coolant input, the temperature increase due to the electrode heating, and the temperature increase due to the oxygen injection. It can be controlled to maintain the target temperature at the start of secondary refining.

Therefore, according to the present invention, by maintaining and controlling the optimum target temperature according to the refining operation of the molten steel, the cost reduction according to the reduction of the temperature and the use of coolant, and the cost reduction due to the use of consumable probes, preventing the quality of the molten steel due to oxygen injection in the molten steel and This eliminates the need for a two minute probe measurement delay and enables continuous temperature measurement automation within the ladle.

According to the present invention, it is possible not only to reduce the cost of using a consumable (disposable) probe for measuring the molten steel temperature in the ladle, which is a conventional technique in the steelmaking secondary refining process, but also to shorten the measurement time (2 minutes). Operation costs can be reduced, and enormous effects such as reduction of additives (heating material, coolant) added to adjust the temperature of molten steel and reduction of worker load can be expected by using real-time molten steel temperature and common temperature measurement information. .

In addition, it is possible to adjust the tapping temperature according to the ladle molten steel temperature in the converter process, which is the previous process, and the operation combination according to the ladle molten steel temperature in the playing process, which is the post process, is possible.

Claims (9)

In the temperature measuring device in the steel ladle, A real-time temperature continuous measurement device in a steel ladle, characterized in that the continuous temperature measuring device for converting the real-time analog temperature measurement data according to the temperature of the molten steel and the ladle inside the ladle into a digital signal. According to claim 1, wherein the continuous temperature measuring device, It is installed on the side of the ladle body, the real-time temperature continuous measurement device in the steel ladle, characterized in that the attachment and detachment is configured to be easily installed in the bonding section of the refractory and the inflow agent forming the inner shell of the ladle body. According to claim 1, wherein the continuous temperature measuring device, A temperature measurement module installed in the main body of the ladle and detecting real-time analog measurement data according to the temperature of the molten steel and the ladle inside the ladle; A temperature / signal converter for converting the temperature measurement data detected by the temperature measurement module into a corresponding temperature measurement value; And a wireless transmitter for converting the temperature measurement value calculated by the temperature / signal converter into a signal that can be transmitted through a wireless network, and wirelessly transmitting the signal in real time. The method of claim 3, wherein the temperature measurement module, It is installed through the side wall of the ladle so that one end is in direct contact with the molten steel, and the temperature sensor for converting the difference between the thermoelectric power of the positive electrode and the negative electrode of the thermocouple sensor into a temperature value and outputs the temperature, and the body of the sensor to protect the entire temperature sensor It is characterized by consisting of a plurality of induction pipes which are installed on the outside of the inner one and two primary protective tube and the inner one and two secondary protective tube to prevent the outflow of the external molten steel by the inner and primary secondary protective tube. Real-time temperature continuous measuring device in the steel ladle. The method of claim 4, wherein the temperature measurement module, Real-time temperature continuous measurement apparatus in the steel ladle further comprises a guide tube support for facilitating the installation and separation of the temperature sensor on the side wall of the ladle. The method of claim 4, wherein the temperature measurement module, A temperature sensor installed through the steel shell, permanent field, semi-permanent field, inflow agent portion of the ladle body, the inner and secondary protective tube to protect the temperature sensor, and the inner / middle / outer portion of the inner protective tube respectively Real-time temperature continuous measurement device in the steelmaking ladle, characterized in that a plurality of induction pipes, and guide pipe pedestal integrally formed. The method of claim 4, wherein the temperature measurement module, It is installed on the side wall of the ladle in order from the outer skin to the inner skin and from the inner skin to the inflow agent, and the temperature sensor of the outer skin of the ladle is installed inside the temperature sensor protector to reduce the temperature deviation occurring under high temperature Real-time temperature continuous measuring device in the steel ladle, characterized in that configured to transmit a continuous measurement value to the temperature / signal converter in connection with the compensation lead. The method of claim 6, wherein the temperature measurement module, Real-time temperature continuity in steel ladle made of composite ceramics (HPBN: Hot Pressed Boron Nitride, Sialon, Silicon nitride) to prevent oxidation, erosion, and thermal shock of inner and secondary sheaths in direct contact with molten steel Measuring device. The method of claim 8, wherein the temperature measurement module, The internal primary protective tube is HPSN (Hot Pressed Boron Nitride) with excellent thermal conductivity, and the internal secondary protective tube is a real-time temperature continuous measurement device in the steel ladle, characterized in that the double composed of Sialon material with excellent corrosion resistance.

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