JPH08271319A - Method for detecting molten metal - Google Patents

Abstract

PURPOSE: To measure an arbitrary metal level on-line, regarding a method for detecting a molten metal which is applicable to a melting furnace for incineration ash containing metals. CONSTITUTION: Incineration ash is inputted into a melting furnace body 1 through an input port 7 to form a molten metal 4 and a molten slug 5. A metal level detecting detector 2 directly connected to a load cell 3 is inserted into the melting furnace through a through-hole part 12. Since the detector 2 consists of a ceramic material having an intermediate density value between the molten metal 4 and the molten slug 5, and creates a large buoyancy when situated in the molten metal 4, and its density is detected as the load cell load, the metal level is detected from the load cell load on-line. By vertically moving the detector 2, the metal level can be detected on-line at an arbitrary time from the relation between the load cell load and the level of the detector 2.

Description

Detailed Description of the Invention

[0001]

The present invention relates to iron, copper, aluminum,
The present invention relates to a molten metal level detection method which is applied to a melting furnace for incineration ash and waste containing metals such as magnesium and nickel and detects the metal level inside thereof.

[0002]

2. Description of the Related Art When incineration ash (hereinafter referred to as incineration ash) containing a metal component such as iron is melted for volume reduction, the melt is separated into two layers of molten metal and molten slag.
Among them, the molten metal needs to be discharged periodically in order to secure the molten volume of the incineration ash, and it is necessary to establish a method for detecting the molten metal level in order to determine the discharge timing.

FIG. 3 is a sectional view of a melting furnace to which a conventional metal level detecting method in a melting furnace is applied, and FIG. 4 is a sectional view showing a coating state of a metal rod for detecting a metal level. In both figures, 1 is a melting furnace main body, 4 is a melting furnace main body 1
Inside the molten metal, 5 is molten slag, 6 is a molten slag discharge port of the melting furnace body 1, 7 is an incinerator ash inlet provided in the melting furnace body 1, 8 is inserted into the melting furnace body 1, and metal A metal rod for detecting the level and 9 are metal outlets.

Conventionally, the metal rod 8 is inserted into the molten slag 5 and the molten metal 4 in the melting furnace body 1 as described above, the metal rod 8 is pulled up, and the surface of the metal rod 8 is melted after cooling as shown in FIG. The batch method in which the coating state of the slag phase 20 and the molten metal phase 21 is investigated and the metal level is judged was used.

[0005]

As described above, the conventional method for detecting the metal level in the melting furnace is to insert the metal rod 8 into the melting furnace body 1 as shown in FIGS. Since the surface of the rod 8 was coated with molten metal and molten slag, and the metal level was detected from the coating state after cooling the metal rod 8, the metal level could not be detected continuously, and the measurement was performed once. It took a long time.

In order to solve such a problem, the present invention provides a molten metal level detecting method capable of rapidly detecting the metal level in the melt of the melting furnace online.

[0007]

Therefore, according to the present invention,
In the method for detecting the level of molten metal in a melting furnace that melts incinerated ash, a detector made of a material having a density approximately midway between the density of molten metal in the melting furnace and the density of molten slag is inserted into the melting furnace. And a molten metal level detecting method for detecting a metal level in the melting furnace by using a buoyancy measuring unit that is connected to the detecting body and detects a buoyancy force that the detecting body receives from the molten metal. .

[0008]

In the molten metal detecting method of the present invention, the density of the detector for detecting the metal level has an intermediate value between the molten slag and the molten metal. Therefore, when the detector is in the molten slag, the detector is A buoyancy force that is smaller than the self weight of the detector and a buoyancy force that is larger than the self weight of the detector when in molten metal. The buoyancy of the detector is applied to the buoyancy measuring means, for example, the load cell, and the buoyancy load is applied, and the measured value of the measuring means, that is, the relationship between the load cell load and the metal level is obtained in advance by the measured value of the measuring means. It is possible to detect online that the level of the molten metal that has been set arbitrarily is reached. Further, when the melt level immediately after the metal is extracted does not reach the level of the molten slag discharge port, if the detector is forcibly moved up and down, the measuring means between the molten slag and the molten metal, that is, the load cell By measuring the inflection point of the relationship between the load and the buoyancy of the detector, the molten metal level at that time can be similarly detected online at any time.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of a melting furnace to which a molten metal level detecting method according to an embodiment of the present invention is also applied. In the figure, 1 is a melting furnace main body, and 2 is a detector for detecting a metal level, which is made of a ceramic high temperature heat resistant material and is directly connected to a load cell 3. The detector 2 is located between the bottom of the melting furnace body 1 and the melt level 10 at the molten slag discharge port 6.

The metal level detecting body 2 is for transmitting buoyancy or gravity generated from the density difference between the molten metal 4 and the molten slag 5 to the load cell 3, and the density of the molten metal 4 and the molten slag 5 A ceramic high temperature heat resistant material having a density value approximately in the middle of the density is used.

Further, the load cell 3 described above penetrates through the through hole 12 so as to be slidable in the vertical direction, and is attached to the melting furnace body 1 by a holding means (not shown). The holding means holds the load cell 3 fixed,
Sometimes it is slid up and down, and when it is fixed, it is used to detect that the molten metal level has reached a certain height from the furnace bottom, and when it is slid vertically, the molten metal level is used. It is used when it is desired to detect the height from the bottom of the furnace.

Further, the through-hole portion 12 through which the metal level detecting body 2 penetrates the melting furnace main body 1 is an opening (not fixed) so that the detecting body 2 can be slid in the vertical direction. It is sealed by blowing nitrogen gas from the outside through 12. The seal fills the inside of the furnace above the molten slag 5 with a nitrogen gas atmosphere.

Numerals 4 and 5 are the above-mentioned molten metal and molten slag, and when incineration ash containing metal components such as iron, copper, aluminum, etc. is fed from the incineration ash feeding port 7, the molten incineration ash is the conventional example. However, as described above, the molten metal 4 and the molten slag 5 are separated due to the difference in density. 6 is a molten slag discharge port, and 9 is a metal discharge port, which are the same as those described in the conventional example.

When the metal level detecting detector 2 is fixed in the melting furnace main body 1 and the incineration ash is continuously charged through the incineration ash charging port 7, the incineration ash is gradually melted, and the metal level 11 is changed over time. It rises with the passage of time. In this process, when the relationship between the metal level and the load applied to the load cell 3 is plotted, the characteristic shown in FIG. 2A is obtained.

When the melt level 10 immediately after the metal is discharged is not at the level of the molten slag discharge port 6, the position of the metal level detecting sensor 2 is slid and lowered, so that the load cell load and the sensor 2 are moved. Figure 2 shows the relationship between levels
As shown in (b), the lower the detector 2, the larger the load cell load. Inflection point 1 using the relationship diagram of FIG.
The position of 3 can be detected as a metal level.

The shape of the metal level detecting body 2 is not limited to the abacus ball shape shown in FIG. 1, but when a plate-shaped body is used, the graph shapes obtained in FIGS. 2 (a) and 2 (b) are It is possible to detect the metal level with the same organization method although it is different.

According to the molten metal level detecting method of such an embodiment, the molten slag 5 and the molten metal 4 in the molten material are
The detector 2 made of a high temperature heat-resistant material such as ceramics having a density value substantially in the middle of the density is directly connected to the load cell 3 and inserted into the furnace at an arbitrary height through the through hole 12 and fixed in the melt. It is possible to measure the load cell load with the load cell 3 and online detect the arrival at the set metal level based on the relationship between the load cell load and the metal level that has been investigated in advance.

Further, the detector 2 is slidably inserted into the through hole 12, and when the melt level does not reach the molten slag discharge port 6, the detector 2 is forcibly lowered to set an arbitrary time. Then, the metal level at that time can be detected online from the inflection point 13 of the load cell load and the floating level.

[0019]

As described above in detail, according to the present invention, in the method for detecting the level of molten metal in a melting furnace for melting incineration ash containing a metal component, the molten metal in the melting furnace is detected. And a density of molten slag, a buoyancy measuring means for inserting a detection body made of a material having a density substantially intermediate between the slag and the smelting furnace, connected to the detection body, and detecting buoyancy received by the detection body from the molten metal. Since it was a molten metal level detection method characterized by detecting the metal level in the melting furnace by using the, the detection body inserted in the melting furnace, to reach the set height of the metal level in the melt It can be detected online, and by moving the height of the detector up and down in the melt, the metal level at any melt level at that time can be detected online at any time. Is shall.

[Brief description of drawings]

FIG. 1 is a sectional view of a melting furnace to which a molten metal detecting method according to an embodiment of the present invention is applied.

FIG. 2 is a characteristic diagram relating to the molten metal detection method of the present invention,
(A) shows the relationship between load cell load and metal level,
(B) shows the relationship between load cell load and detector level.

FIG. 3 is a sectional view of a melting furnace to which a conventional molten metal detection method is applied.

FIG. 4 is a diagram showing a coating state of a metal rod used in a conventional molten metal detection method.

[Explanation of symbols]

 1 Melting furnace main body 2 Metal level detection detector 3 Load cell 4 Molten metal 5 Molten slag 6 Molten slag discharge port 7 Incinerator ash charging port 9 Metal discharging port 12 Through hole 13 Inflection point

Claims (1)

[Claims] 1. A method for detecting a level of molten metal in a melting furnace for melting incineration ash containing a metal component, the method comprising a material having a density approximately midway between the density of the molten metal in the melting furnace and the density of the molten slag. A metal level in the melting furnace is detected by using a buoyancy measuring unit that is inserted into the melting furnace and is connected to the detection body and that detects the buoyancy force that the detection body receives from the molten metal. And the molten metal level detection method.