WO2009146665A1

WO2009146665A1 - Device and method for detecting and controlling the slag in molten steel

Info

Publication number: WO2009146665A1
Application number: PCT/CN2009/072728
Authority: WO
Inventors: 田志恒
Original assignee: 田陆; 田立
Priority date: 2008-06-02
Filing date: 2009-07-10
Publication date: 2009-12-10
Also published as: CN101306466A; CN101306466B; EP2316594A1

Abstract

A device for detecting and controlling the slag in the molten steel comprises a sensor (1) and a signal processor (2). The sensor (1) is used for obtaining surface image information of the covering layer (8) of the molten steel and sending the image information to the signal processor (2); and the signal processor (2) is used for determining whether the slag turns up or not based on the image information and sending a slag-roughing alarm signal and a control signal to stop the molten steel and the slag flowing. And a method for detecting and controlling the slag in the molten steel is disclosed. The device and the method can be operated conveniently.

Description

Apparatus and method for detecting and controlling slag in molten steel

Technical field

The invention relates to a slag detection and control technology, in particular to a device for detecting and controlling slag flowing from a large package through a long nozzle to a molten steel in a medium package, and a detection and control flow from the large package through the long nozzle to the middle The method of slag in the molten steel of the package. Background of the invention

In the continuous casting and smelting process, slag will flow with the molten steel to the middle package at the end of the molten steel flowing out of the big bag. In order to ensure the purity of the water in the package, it is necessary to detect and control the slag flowing from the large package to the package. At present, the more common detection technologies are electromagnetic method and vibration method. The first disadvantage of the electromagnetic method is that the electromagnetic sensor is installed in a high temperature area around the upper nozzle of the large bag. The electromagnetic sensor is subjected to a high temperature baking life, and once the sensor is damaged, it needs to be replaced when the large bag is repaired (the cycle is usually one week). , affecting the continuous operation of the testing equipment; The second disadvantage of the electromagnetic method is that the installation of the sensor requires the modification of the large-seat brick and the reference plate, and the modification work is relatively large. These two shortcomings affect the widespread promotion of electromagnetic slag technology. The first disadvantage of the vibration method is that the vibration source of the continuous casting site is seriously disturbed. Even if the adjustment of the large package skateboard is restricted during the slag inspection and the start of many electromechanical equipment, the vibration slag equipment will also have a false alarm in advance, which will make the large Excessive amount of steel after the package seriously affects the utilization rate of the steel in the big package; the second disadvantage of the vibration method is that the difference between the vibration signal caused by the molten steel and the slag-containing steel in the vibration sensor is not significant and the alarm is leaked, so that the inside of the package is The slag layer is too thick, which affects the purity of the water in the steel. These shortcomings cause the slag alarm signal issued by the electromagnetic method and the vibration method to prompt the operator to manually terminate the transfer of the slag-containing steel water in the large package to the middle package, and the delay of the manual operation relative to the lower slag alarm signal increases the inflow from the large package. The amount of slag in the package. SUMMARY OF THE INVENTION In view of one or more of the problems described above, the present invention provides an apparatus for detecting and controlling slag flowing from a large package through a long nozzle to a molten steel in a medium package and detecting and controlling from the large package through the long nozzle The method of flowing slag into the molten steel in the middle package is intended to provide a melting and detecting device for detecting and controlling the flow of the large package to the middle package, which is easy to install and has a long service life without being disturbed by environmental disturbances. Slag device and method.

An apparatus for detecting slag in molten steel according to an aspect of the present invention includes: a sensor for acquiring one or more topographical information of a surface of a molten steel coating in a middle package and transmitting the topographical information to a signal processor; And a signal processor, configured to determine whether slag is present according to the topographical information, and send a slag warning signal in the case where it is determined that slag is present, and stop the molten steel and the slag from flowing into the middle package through the long nozzle. control signal. Among them, the molten steel and the molten slag flow into the middle package from the large bag through the long nozzle, and the density of the molten slag is smaller than the density of the molten steel.

The sensor may be an ordinary optical imaging device or an infrared sensitive imaging device.

Wherein, the topographical information includes at least one of the following information: height information of a partial surface of the molten steel cover layer near the long nozzle in the middle package and brightness information of a partial surface of the molten steel cover layer near the long nozzle in the middle package .

Wherein, the signal processor is configured to emit a brightness alarm signal if the brightness information exceeds a predetermined value of the brightness. The signal processor is used to issue a height alarm signal if the altitude information exceeds a predetermined height value.

The sensor detects the height information by measuring the change in the position of the boundary line between the long nozzle and the surface of the molten steel cover in the middle pack.

A method for detecting slag in molten steel according to another aspect of the present invention includes the following steps: Step 1: Obtaining more than one topographical information of a surface of a molten steel coating in a middle package; Step 2, determining whether there is slag according to the shape information; and step 3, issuing a slag alarm signal in the case where it is determined that slag is present, and stopping the molten steel and slag from flowing into the package through the long nozzle Control signal. Wherein, the molten steel and the molten slag flow into the middle package from the large bag through the long nozzle, and the density of the molten slag is smaller than the density of the molten steel.

Wherein, the topographical information includes at least one of the following information: height information of a partial surface of the molten steel cover layer near the long nozzle in the middle package and brightness information of a partial surface of the molten steel cover layer near the long nozzle in the middle package . In step three, a brightness alarm signal is issued if the brightness information exceeds a predetermined value of brightness. In step three, a height alarm signal is issued if the height information exceeds a predetermined height value.

Here, in the first step, the height information can be detected by measuring the change in the position of the boundary line between the surface of the molten steel in the long nozzle and the middle package.

According to the present invention, there is provided an apparatus and method for detecting and controlling slag flowing from a large package to a middle package which is easy to install and has a long service life without being disturbed by environmental disturbances. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawing:

1 is a block diagram of a slag device for detecting and controlling molten steel flowing from a large package through a long nozzle to a middle package according to an embodiment of the present invention;

2 is a diagram for detecting and controlling from a large bag through a long nozzle according to an embodiment of the present invention.

3⁄4 to the method of slag in the molten steel in the middle package;

3 is a schematic diagram of a specific application of a device for detecting and controlling slag flowing from a large package through a long nozzle to a molten steel in a package according to an embodiment of the present invention. Mode for carrying out the invention

The present invention will be further described in detail below with reference to the accompanying drawings.

In one embodiment of the present invention, the sensor is used to measure the increase in the height of the partial surface of the water-clad layer of the steel-clad steel near the long nozzle extending into the medium-clad steel and the brightness enhancement, and the signal processor processes the sensor signal. And according to the degree of local surface elevation and brightness enhancement of the water-clad layer of the steel, the slag alarm signal and the control signal for driving the sliding mechanism to close the large water inlet are issued.

In one embodiment of the present invention, the slag flowing into the middle package of the large package is detected by using two physical quantities of height and brightness, and the sensors having long life and easy installation are detected by the sensors far away from the high temperature area, The signal processor separately processes and issues an independent alarm signal based on the results of the respective processing. These two methods complement each other to increase the alarm rate. Since the specific gravity of the slag is only 1/3 of that of molten steel, the slag flowing from the large bag into the middle of the bag will float upward near the long water inlet of the large bag, so that the surface of the water-clad layer of the steel-clad steel is locally raised first. It is far greater than the fluctuation of the water-covered layer of the metal-clad steel caused by the impact of the inflow of the large-clad steel into the medium-package, and can issue a reliable slag warning signal in time; and then the flaming slag breaks through the surface of the water-clad layer of the steel-clad steel and suddenly strengthens Brightness, and timely send a reliable slag alarm signal. The increase in the surface of the water-clad layer of the medium-clad steel caused by the slag was detected about 0.6 seconds earlier than the surface brightening. At the same time as the slag alarm signal is issued, a control signal for driving the slider mechanism to close the large water supply port is issued. The high reliability of the altitude alarm signal and the high reliability of the brightness alarm signal and the high alarm rate complemented by the two methods are the technical basis for controlling the sliding mechanism to close the large water supply port by the alarm signal.

The increase of the local surface height and the enhancement of the brightness of the water-clad layer of the steel-clad steel layer caused by the slag floating under the large bag can be observed by an ordinary camera device. The brightness of the slag relative to the molten steel is more significant in the infrared band, and the infrared sensitive imaging device can improve the resolution of the large bag slag detecting device.

In the case where the slag-reducing technique is used to reduce the amount of slag and the water-covered layer of the metal-clad steel is thin, the water-clad layer of the slag is formed by a molten water ring around the long nozzle, which is caused by the shaking of the long nozzle.圏 is the slag flowing in the molten steel of the large package to the middle of the package, which is floated by the buoyancy of the molten steel and breaks through the breakthrough of the water-clad layer of the molten steel, so that the molten ring raft and its vicinity rise first and then break through the partial surface of the cover layer to make the brightness Sudden increase.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram of an apparatus for detecting and controlling slag flowing into a molten steel from a large package through a shroud in accordance with an embodiment of the present invention. As shown in FIG. 1, according to an embodiment of the present invention, an apparatus for detecting and controlling slag flowing from a large package through a long nozzle into a medium-clad steel water includes: a sensor 102 for acquiring a molten steel cover layer in the middle package More than one topographical information of the surface and transmitting the topographical information to the signal processor 104; and a signal processor 104 for determining whether slag is present according to the topographical information and determining that slag is present In the case of the alarm signal and stop the molten steel and slag through the long nozzle from the big bag into the control signal. Among them, the molten steel and molten slag flow into the middle package from the large bag through the long nozzle, and the density of the molten slag is smaller than the density of the molten steel.

The sensor 102 may be a general optical imaging device or an imaging device sensitive to infrared rays.

Wherein, the signal processor 104 emits a brightness alarm signal if the brightness information exceeds a predetermined value of brightness.

The signal processor 104 issues a height alert signal if the altitude information exceeds a predetermined height value. The sensor detects the height information by measuring the change in the position of the boundary line between the long nozzle and the surface of the molten steel cover in the middle pack.

2 is a flow chart of a method for detecting and controlling slag flowing from a large package through a long nozzle into a molten steel in a package according to an embodiment of the present invention. As shown in Fig. 2, the slag for detecting and controlling the molten steel flowing from the large bag through the long nozzle into the middle package according to an embodiment of the present invention includes the following steps:

Step S202, acquiring more than one shape information of the surface of the molten steel cover layer in the middle package;

Step S204, determining whether slag is present according to the topography information; and step S206, issuing an alarm signal in the case where it is determined that slag is present, and stopping the control signal that the molten steel and slag flow from the large package into the middle package through the long nozzle.

Among them, molten steel and molten slag flow into the middle package from the large bag through the long nozzle, and the density of the molten slag is smaller than the density of the molten steel.

In step S206, a brightness alarm signal is issued if the brightness information exceeds the brightness predetermined value. In step S206, a height alarm signal is issued if the height information exceeds a predetermined height value.

Here, in step S202, the height information can be detected by measuring the change in the position of the boundary line between the long nozzle and the surface of the molten steel coating in the middle pack.

In an embodiment of the present invention, a device for detecting the occurrence of slag in the process of flowing molten steel in a large package through a long nozzle to a middle package is proposed, including sensor and signal processing for observing the surface of the water cladding layer of the steel. Machine, wherein the sensor detects the partial surface height of the water-clad layer of the steel-clad steel near the long nozzle extending from the large package into the water in the steel With the enhancement of brightness and brightness, the signal processor separately processes the height and brightness signals and respectively issues a height alarm signal and a brightness alarm signal for marking the slag and a control signal for driving the slider mechanism to close the large package. The sensor for observing the surface of the water cladding layer of the steel can be a general optical imaging device. The sensor for observing the surface of the water cladding layer of the steel can also be an infrared sensitive imaging device.

Among them, the sensor that can observe the surface of the water-clad layer of the medium-clad steel is used to measure the rise height of the local surface of the water-covered layer of the medium-clad steel by measuring the change of the position of the boundary line between the long water inlet and the water-covered layer of the medium-clad steel.

Fig. 3 is a schematic view showing a concrete application of a device for detecting molten slag in molten steel according to an embodiment of the present invention. As shown in Fig. 3, the molten steel 4 in the large bag 3 appears from the bottom of the large bag 3 through the long nozzle 6 to the molten steel 9 of the middle bag 7 in the process of detecting the slag. The slag-containing molten steel flows into the medium-packed molten steel. The molten slag will float upward by the buoyancy force, causing the local surface of the water-clad cover layer 8 near the long nozzle 6 to rise, eventually breaking through the partial surface of the cover layer 8 to enhance the surface brightness. . The camera (sensor) 1 observes the surface of the molten steel cover 8 near the long nozzle 6 and the long nozzle 6 near the cover 8, and the signal processor 2 processes the observed signals of the camera 1 to give lengths respectively. The increase in the local surface height and brightness of the water-clad layer in the vicinity of the nozzle 6 and the high-rise alarm signal and the brightness increase alarm signal and the control signal for driving the large-pack skateboard mechanism 5 to close the large package nozzle are issued in time.

The shaking of the shroud 6 causes the water-clad steel layer 8 of the tundish to form a molten ring around the shroud 6. When the slag entering the metallurgical steel 9 floats upward, the molten ring raft becomes the breakthrough point of the slag floating up and rushing out of the water-clad steel cover layer 8, so that the ring raft and its vicinity rise first and then brighten and A large area of red slag appears near the ring. The molten enthalpy and the slag and molten steel mixture floating up to the partial surface of the cover layer 8 are brighter and the long nozzle 6 is darker, and the boundary line between the long nozzle 6 and the ring 图 is easily distinguishable. When long When the partial surface of the molten steel cover 8 near the nozzle 6 rises, the elevation angle α 10 of the boundary line P observed by the camera 1 will increase. The camera 1 observes the change in the elevation angle α 10 to determine the rising height of the partial surface of the molten steel cover layer 8, and at the same time measures the degree of localized surface enhancement of the cover layer. The signal processor 2 respectively issues an alarm signal according to the degree of height increase and the degree of brightness highlighting, and a control signal for driving the large pack slide mechanism 5 to close the large water supply port.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the present invention. Within the scope of protection.

Claims

Claim

What is claimed is: 1. A device for detecting and controlling slag in molten steel, wherein the molten steel and the slag flow into a middle package from a large bag via a long nozzle, the density of the slag being less than a density of the molten steel, It is characterized by including:

a sensor for acquiring more than one topographical information of a surface of the molten steel coating in the middle package and transmitting the topographical information to a signal processor;

The signal processor is configured to determine, according to the topographical information, whether the slag is present, and issue a slag "3" alarm signal and stop the molten steel and the ground in the case where it is determined that the slag is present The slag flows into the middle package from the large package via the shroud.

2. Apparatus according to claim 1 wherein said sensor is a conventional optical imaging device.

3. Apparatus according to claim 1 wherein said sensor is an imaging device sensitive to infrared.

4. The apparatus according to claim 1, wherein the topographical information comprises at least one of the following information: a height of a partial surface of the molten steel coating layer in the middle of the shroud near the shroud Information and brightness information of a partial surface of the molten steel cover layer in the middle of the shroud in the middle of the package.

The apparatus according to claim 4, wherein said signal processor is further operative to emit a brightness alarm signal if said brightness information exceeds a predetermined value of brightness.

6. Apparatus according to claim 4 or claim 5 wherein said signal processor is further operative to issue a height alert signal if said altitude information exceeds a predetermined height value.

7. The apparatus according to claim 4, wherein the sensor detects the height information by measuring a change in a position of a boundary line between the shroud and a surface of the molten steel cover layer in the middle pack.

A method for detecting and controlling slag in molten steel, wherein the molten steel and the slag flow into a middle package from a large bag via a long nozzle, and the density of the slag is less than a density of the molten steel. It is characterized in that it comprises the following steps:

Obtaining more than one shape information of the surface of the molten steel cover layer in the middle package; determining whether the slag is present according to the shape information;

A slag warning signal is issued in the case where it is determined that the slag is present, and a control signal for stopping the molten steel and the slag flowing from the large package into the middle package via the long nozzle.

9. The method according to claim 8, wherein the topographical information comprises at least one of the following information: a height of a partial surface of the molten steel cover layer in the middle of the shroud near the shroud Information and brightness information of a partial surface of the molten steel cover layer in the middle of the shroud in the middle of the package.

10. The method according to claim 9, wherein the brightness alarm signal is issued if the brightness information exceeds a predetermined value of brightness.

11. Method according to claim 9 or 10, characterized in that a height warning signal is issued if the height information exceeds a predetermined height value.

The method according to claim 9 or 10 or 11, wherein the height information is detected by measuring a change in a position of a boundary line between the shroud and a surface of the molten steel cover layer in the middle pack.