JPS5849610B2 - Method for detecting hot metal intrusion into slag gutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting the intrusion of hot metal into a slag trough.

The molten iron and molten slag flowing out from the blast furnace taphole are separated by a skimmer, and the molten slag is led to the slag trough.

The slag trough is generally provided with a sump to further separate the hot metal in the molten slag.

However, accidents may occur in which hot metal enters the slag gutter.

In this case, there is currently no way to automatically detect the intrusion of hot metal into the slag gutter, so if the intrusion of hot metal is detected late, there is a risk that the following accidents will occur.

(1). When collecting slowly cooled slag, fermented pig iron flows into the dry pit, creating a risk of steam explosion and making it difficult to collect the slag in the dry pit.

(2). When extracting granulated slag, a steam explosion inside the granulated hopper can damage equipment, stop the production of granulated slag, and cause human disasters.

(3). If a water-cooled slag gutter is used, this will lead to equipment damage and human disaster due to steam explosion.

This invention was made in order to solve the various problems mentioned above, and a cencer for measuring heat flow rate is installed at the bottom of the slag gutter, and it is possible to measure the difference in heat flow rate between molten slag and hot metal. The present invention is characterized in that these heat flow rates are detected by the sensor, and infiltration of hot metal into the slag gutter is detected based on whether or not the detected value exceeds a set value.

This invention will be explained by way of examples and with drawings.

FIG. 1 is a schematic explanatory diagram showing an embodiment of the method of the present invention.

In the figure, 1 is a water-cooled slag gutter having a cooling water passage 5 formed therein, and 2 is a known sensor for measuring heat flow rate embedded in the bottom of the water-cooled slag gutter 1 via a sealing material 6 or the like.

Reference numeral 3 denotes an arithmetic unit that compares the detected value by the heat flow measurement sensor 2 with a preset set value, and outputs a signal when the detected value exceeds the set value.

Reference numeral 4 denotes an alarm device that issues an alarm based on a signal from the computing unit 3.

With this configuration, when only molten slag is flowing through the water-cooled slag gutter 1, the heat flow rate detected by the heat flow measurement sensor 26 is constant, as shown in FIG. However, if hot metal gets mixed into the molten slag,
The heat flow rate detected by the heat flow measurement sensor 2 increases rapidly.

This means that the specific heat and specific gravity of molten slag are approximately 0.28K.
c a l/Kg °C and 2. OKv/L, whereas the specific heat and specific gravity of hot metal are approximately 0. 2 2 Kca
4/K9 C and 6. This is because the heat flow rate per unit volume of 8 Kq/t is about three times larger for hot iron when comparing the two at the same temperature.

Therefore, if a value close to the heat flow possessed by molten slag is preset in the calculator 3 as a set value, when hot metal is mixed into the molten slag, a signal will be output from the calculator 3 and the alarm device 4 will output a signal. An alert will be issued so you will know this immediately.

Although the above embodiment is a case where the method of the present invention is applied to a water-cooled slag gutter, it is of course possible to obtain the same effect by applying the method of the present invention to other slag gutter. .

As explained above, according to the present invention, when hot metal enters the slag gutter, it can be detected immediately and the following means can be provided, so that the intrusion of hot metal into the slag gutter can be detected immediately. This brings about extremely useful effects, such as being able to solve all of the various problems that have arisen.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of an embodiment of the method of the present invention, and FIG.
The figure shows the change in heat content when using only fermented molten slag and when molten pig iron is mixed therein. In the drawing, 1... water-cooled slag gutter, 2...
...sensor for measuring heat flow rate, 3...computer,
4...Alarm device, 5...Cooling water flow path, 6...Sealing material.

Claims (1)

[Claims] 1 Install a heat flow measurement sensor at the bottom of the slag gutter,
Since there is a difference in heat flow between molten slag and hot metal, these heat flows are detected by the sensor, and infiltration of hot metal into the slag gutter is detected based on whether or not this detected value exceeds a set value. A method for detecting the intrusion of pig iron into a slag gutter.