JPH01127154A - Molten metal container - Google Patents

Abstract

PURPOSE:To grasp the molten metal level position with high accuracy and to improve the working efficiency by providing the heat pipe running along the vertical direction and its temp. measuring means inside the side wall of the container main body. CONSTITUTION:A heat pipe 20 is embedded so as to run along the vertical direction of a side wall 14 at the side wall 14 inside of one part of the main body 12 of the ladle 11 for storing a molten steel, for instance, the upper end thereof is located lower than the molten metal 16 level prior to the steel tapping starting, a thermocouple 19 is fitted to the pipe 20 and the temp. of the pipe 20 is detected. An operation fluid 32 is fitted in the closed container of the main body 31 inside of the pipe 20 and a wick 33 is provided over the about whole face of the main body 31 inner wall. When a steel output is started by opening a steel output port 18, the molten metal level is reduced more than the upper end of the pipe 20, the temp. of the upper end thereof drops and the temp. difference of the high temp. part of the part coming into contact with the molten steel 16 of the pipe 20 and the low temp. part of the part higher than the molten steel level is quickly uniformalized. Since the temp. of the pipe 20 is reduced according to the reduction amt. of the molten steel level the molten steel level position can correctly be grasped from the temp. of the pipe 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a molten metal container that is provided with a tapping spout and that taps molten metal from the tap.

[Prior art] For example, in continuous casting of steel, a ladle storing molten steel after converter blowing is transported to continuous casting equipment, and the continuous casting equipment is passed through a tapping port provided at the bottom of the ladle. The desired steel material is prepared at step 19 by supplying molten steel to the molten steel. The 3ft continuous casting facility is equipped with a tundish, a water-cooled copper mold, a slab guide roll, and a pinch roll for handling slabs. The molten steel in the steel drawer is temporarily stored in a tundish, and is supplied to the mold from the tundish. Then, this molten steel is cooled in a mold and becomes a slab having an unsolidified portion inside. This slab is pulled downward by pinch rolls and further cooled while being guided by guide rolls to completely solidify and become a steel material.

This continuous casting! During production, slag is floating in the molten steel in the ladle, and if this slag gets mixed into the slab, it will cause quality defects in the steel material. In this case, tapping is stopped with some molten steel remaining in the ladle without tapping, that is, when the level of the molten steel reaches a predetermined position. As means for detecting that the molten steel level has reached a predetermined position, there are, for example, the following two methods. The first method is to grasp the relationship between the tapping time and the hot metal level position, and then stop tapping after a predetermined period of time has elapsed after the start of tapping. Second, measure the weight of the molten steel in advance, measure the tfiat of the ladle in which the molten steel is stored, and tap the steel using a load cell, and then subtract the weight of the molten steel from the weight detected by the load cell. Based on this, the molten steel surface position is grasped, and tapping is stopped when it is detected that the molten steel surface position has reached a predetermined value.

[Problems to be Solved by the Invention] However, in the case of the above-mentioned method, the accuracy is low, and the position of the molten lagoon surface when tapping is stopped varies widely. For this reason, the hot water level is too low and slag is drawn in,
A situation occurs in which the molten metal level is too high and the molten steel yield decreases. Furthermore, in the case of the second means described above, there is a problem that the work efficiency is low because of the incidental work such as measuring the weight of the steel plate in advance.

This invention was made in view of such circumstances, and
The purpose of the present invention is to provide a molten metal container that can accurately determine the molten steel level position when tapping is stopped, and does not reduce work efficiency due to grasping the molten metal level position. [Means for achieving this] The WJ container according to the present invention includes a container body having a tap outlet for storing molten metal, a heat pipe buried in the side wall of the container body along the vertical direction of the side wall, and a heat pipe for storing molten metal. It is characterized by having a temperature measuring means for measuring the temperature of the pipe.

[Operation] A heat pipe transfers heat from a high temperature section to a low temperature section using the latent heat of vaporization of the working fluid.

In this heat pipe, a working fluid with relatively large latent heat is charged into a closed container, and when a part of the fluid is brought into contact with a high-temperature part and another part with a low-temperature part, the working fluid evaporates in the high-temperature part. This gas is supplied to the low temperature part due to the internal pressure difference and is cooled to N1. At this time, heat is transported from the high temperature part to the low temperature part using the latent heat of vaporization, so an extremely large amount of heat can be transported from the high temperature part to the low temperature part, and as a result, the high temperature part and the low temperature part It is possible to equalize the temperature difference between the two in a short time. Therefore, when the heat pipe is buried in the side wall of the container body along the vertical direction of the side wall as in the present invention, if the surface of the molten metal '6A falls below the upper end of the heat pipe, the molten metal in the heat pipe decreases as the bloodletting decreases. Since the area adjacent to the heat pipe decreases, the temperature of the heat pipe decreases accordingly. In other words, there is a correlation between the position of the melt lagoon surface and the heat pipe temperature. Therefore, by detecting the temperature of this heat pipe with an appropriate temperature measuring means, the position of the molten metal surface can be accurately and efficiently grasped.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic cross-sectional view showing a bath temperature vessel according to an embodiment of the present invention. The steel body 12 is composed of an inner brick 13 and an iron shell 15 covering the outside thereof, in which molten steel 16 is stored, and slag 17 is placed on top of the molten steel 16. The heat pipe 20 is buried in one side wall 14 of the container body 12 along the vertical direction of this side wall 14.The upper end of the heat pipe 20 is
It is located below the scene of molten steel 16 at the start of the exit ^11. A thermocouple 19 is attached to the heat pipe 20, and the temperature of the heat pipe 20 is detected by a detection device (not shown). A tap hole 18 is provided at the bottom of the ladle body 12, and molten steel is injected from the tap hole 18 into a tundish of a continuous #jI construction facility (not shown).

Hereinafter, the heat pipe 20 will be explained in detail. Second
The figure is a conceptual diagram of a heat pipe. Heat vibe body 3
1 is a sealed container, and a working fluid 32 is contained in this container.
is loaded. As the working fluid 32, for example, those having a large latent heat of vaporization such as nitrogen, water, and silver are used. Note that nitrogen is applied at a temperature of -200 to -160°C, water is applied at a temperature of 30 to 250°C, and silver is applied at a temperature of 1800 to 2300°C. In the case of this embodiment, the side wall portion 14 is
00 to 250°C, water that can be used within this range is used as the working fluid.

A wick 33 is provided on the inner wall of the main body 32 over substantially the entire surface. The wick 33 is made of copper or stainless wire mesh, or a material having a small capillary diameter such as a sintered body.

When such a heat pipe is installed in a position where a high temperature section 41 having a relatively high temperature and a low temperature section 42 having a relatively low temperature exist, the temperature of the heat pipe main body 31 can be reduced by appropriately selecting the working fluid 32. In the region 34 on the high temperature section 41 side, the working fluid 32 is heated by the heat of the wet section 41 and evaporates to become a gas. Then, the region 35 of the heat pipe main body 31 on the low temperature section 42 side becomes in a relatively low pressure state, and the gaseous working fluid 32 is supplied to the region 35. lol
Since the A region 5 is located in the low temperature section 42, the supplied gaseous working fluid 32 is cooled (that is, radiates heat), condenses, and liquefies. The liquefied working fluid 32 is transported to the region 34 via the wick 33 by capillary action. In this way, the heat from the high temperature section 41 can be transported to the low temperature section 42, and the temperature difference therebetween can be alleviated. In this case, since heat can be transported using the latent heat of vaporization, a relatively large amount of heat can be transported from the high temperature part to the low temperature part in a short time. In addition, since heat is transferred by thermal diffusion caused by the steam flow, the temperature difference between the high temperature section and the low temperature section can be quickly equalized.

FIG. 3 is a graph showing the surface humidity of each part when one end of each pipe is heated and the other end is cooled, comparing a copper hollow pipe and a heat pipe. In the figure, the solid line indicates the case of a heat pipe, and the broken line indicates the case of a copper pipe. According to this, in the case of copper pipes, the WIR difference between the heating part and the cooling part is about 80°C, whereas
In heat pipes, the temperature difference between them is about 10℃
It can be seen that it is. This result confirmed the temperature uniformity effect of the heat pipe. Furthermore, it can be seen that the temperature rise is small in the case of a heat pipe.

Next, the operation of this embodiment will be explained. First, take
411 is installed in continuous casting equipment. Next, the tapping port 18
The steel is opened to begin tapping the steel into a tandem pipe (not shown). After a predetermined period of time has elapsed after the start of tapping, the molten steel level falls below the upper end of the heat pipe 20, and the humidity at the upper end of the heat pipe decreases accordingly. In this case, since the heat pipe has the above-mentioned function, the part of the heat pipe 20 adjacent to the molten steel 16 becomes a high temperature part, and the molten steel 16 becomes hot.
The part above the surface becomes a low temperature part, and the heat pipe-2
A temperature of 0 indicates a predetermined value lower than before the start of steel tapping.

When the molten steel level further decreases, the area of the low temperature portion is expanded, and the temperature of the heat pipe 20 decreases in accordance with the level lowering port. In other words, the molten tI4m surface position and the heat pipe 20
There is a correlation between the humidity and the temperature of the molten steel lake, and by understanding the relationship between the molten steel lake surface position and the temperature of the heat pipe 20 in advance, the molten steel lake surface position can be determined from the temperature of the heat pipe 20. Therefore, the possibility that the slag 17 will be involved in the tapping flow and the possibility that the yield of molten steel will decrease can be significantly reduced. In this manner, the position of the molten steel lake surface is determined by measuring the temperature of the heat pipe 20, so that the detection accuracy can be extremely high. Further, since no incidental work is required, work efficiency is extremely high.

In this embodiment, a ladle is used as the molten metal container, but the present invention is not limited to this, and the present invention can also be applied to a molten metal container such as a tundish.

[Effects of the Invention] According to the present invention, since the heat pipe is embedded in the side wall of the container body along the vertical direction of the side wall, the temperature of the heat pipe can be changed depending on the position of the melt in the container body. be able to. Therefore, the position of the molten steel lake surface can be determined by detecting the humidity of the heat pipe with the humidity measuring means.

In this way, since the mtA water level position is determined based on the temperature change of the heat pipe, the accuracy of detecting the water level position can be extremely high. Further, since no incidental work is required, work efficiency can be significantly increased.

[Brief explanation of the drawing]

FIG. 1 shows a molten metal container (ladle) according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram showing a heat pipe.
FIG. 3 is a graph that does not show the effect of the heat pipe. 11: Ladle (molten metal container), 12; Ladle body (container body)
, 14: Side wall portion, 18; Steel tapping port, 19; Thermocouple, 20;
Heat vibe, 31; Heat pipe body, 32: Made by vJ
Fluid, 33: Wick applicant's agent Patent attorney Takehiko Suzue No. 10

Claims (1)

[Claims] It has a container body having a tap outlet and for storing molten metal, a heat pipe buried in the side wall of the container body along the vertical direction of the side wall, and a temperature measuring means for measuring the temperature of the heat pipe. A molten metal container featuring: