JPH02251084A - Melting furnace - Google Patents

Abstract

PURPOSE:To heat a tubular body by the heat of surrounding molten slag to eliminate the cooling and solidification of the molten slag passing through the tubular body and prevent blockade of the tubular body and a slag die charging port by a method wherein the slag discharging port is provided at the bottom of a furnace body and the tubular body, provided uprightly in the center of the furnace body so as to surround the circumference of the opening of the slag discharging port, is formed so as to have a length extending from the bottom of the furnace body to the vicinity of electrodes. CONSTITUTION:A slag discharging port 15 is provided at the bottom 14 of a furnace body 11 toward the outside of the furnace so as to have a truncated conical shape while a tubular body 16, provided so as to surround the circumference of the opening of the slag discharging port 15, is formed so as to have a length extending from the bottom 14 of the furnace body 11 to the vicinity of electrodes 12, 13. A material 17 to be molten, which is reserved in the furnace body 11, generates heat as an electric resistance body by impressing a voltage on the electrodes 12, 13 and becomes molten slag 18 which stagnates in the furnace body 11. Then, the molten slag 18, stagnating above the upper opening of the tubular body 16, is taken out of the slag discharging port 15 through the tubular body 16. In this case, the tubular body, positioned between the electrodes 12, 13, is formed of the same material as the electrodes 12, 13 and the electric resistance thereof is small whereby heat is generated on the surface of the tubular body by the focusing of current and the tubular body is also heated by the heat of the surrounding molten slag 15. Accordingly, the mol;ten slag, passing through the tubular body 16, will never be solidified by cooling whereby the discharging port 15 will never be blockaded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a melting furnace for melting incineration residue of municipal waste and sewage treatment sludge.

2. Description of the Related Art Conventionally, a melting furnace for melting incineration residue of municipal waste and sewage treatment sludge has been of the type shown in FIG. 3, for example. In FIG. 3, a pair of electrodes 2 and 3 are provided facing each other in a furnace body 1, and a slag discharge port 4 is formed at a position a predetermined distance above the electrodes 2 and 3. . Further, a pair of auxiliary electrodes 5 and 6 were provided in the middle of the slag discharge port 4, and the electrode 2.3 and the auxiliary electrodes 5 and 6 were connected to a power supply device (not shown). Furthermore, a burner 7 was provided in front of the slag discharge port 4. By applying a voltage to the electrodes 2 and 3, the material to be melted, such as incineration residue, put into the furnace body 1 is heated and melted as an electric resistor, and the molten slag 8 and molten salt 9 are melted. was taken out from the slag outlet 4 with ash 10 floating on top of the molten salt 9.

Problems to be Solved by the Invention However, with the above-described configuration, there is a problem in that the molten slag 8 is cooled at the slag discharge port 4, and the cooled molten slag 8 cools and solidifies, thereby blocking the outlet. For this reason, it was necessary to heat the slag discharge port 4 with the auxiliary electrodes 5, 6 and the burner 7.

The present invention solves the above problems, and is a melting furnace that can prevent clogging at the slag discharge port without heating the slag discharge port by a separate means, and can take out molten slag and molten salt separately. The purpose is to provide

Means for Solving the Problems In order to solve the above problems, the present invention provides a melting furnace having an electrode on the side of the furnace body for melting a material to be melted stored inside the furnace body. A slag discharge port is provided at the bottom of the furnace body, and a cylindrical body is provided vertically inside the furnace body surrounding the opening of the slag discharge port, and is formed in a length that reaches from the bottom of the furnace body to the vicinity of the electrode. There is.

In addition, a salt discharge port is provided at the bottom of the furnace body, and a second salt discharge port is provided vertically inside the furnace body surrounding the opening of this salt discharge port.
The cylindrical body has a length extending from the bottom of the furnace body to above the electrode.

Operation With the above-described configuration, the material to be melted stored inside the furnace body generates heat as an electric resistor by applying a voltage to the electrode, and becomes molten slag and stays inside the furnace body. Then, the molten slag remaining above the upper end opening of the cylinder passes through the cylinder and is taken out from the slag discharge port. At this time, since the cylindrical body is heated by the heat of the surrounding molten slag, the molten slag passing through the cylindrical body does not cool and harden, thereby preventing the cylindrical body and the slag discharge port from clogging. In addition, since the molten slag staying below the upper end opening of the cylinder does not flow out, an empty state near the electrodes caused by excessive flow of molten slag in the furnace body is avoided, and continuous heating is always performed.

Moreover, the molten salt eluted from the object to be melted floats on the molten slag. The molten salt remaining above the upper end opening of the second cylinder passes through the second cylinder and is taken out from the salt outlet. At this time, since the second cylindrical body is heated by the heat of the surrounding molten slag, the molten salt passing through the second cylindrical body does not cool and harden, thereby preventing clogging of the cylindrical body and the slag discharge port. In addition, since the molten salt and molten slag that remain below the upper end opening of the second cylinder do not flow out from the second cylinder, the molten salt and molten slag are taken out separately and continuously from the second cylinder and the cylinder, respectively. It will be done.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In the figure, inside the furnace body 11 there are a pair of electrodes 12 and 13.
are provided facing each other, and the electrodes 12 and 13 are connected to a power supply (not shown).

And the furnace body! A slag discharge port I5 is formed in the bottom part 14 of (2) so as to widen toward the outside.
A cylindrical body 16 is provided surrounding the opening of 5. This cylindrical body 16 is formed in a length reaching from the bottom 14 of the furnace body If to the vicinity of the electrode 12.13, is located between the picture electrodes 12.13, and is made of the same material as the electrode 12.13 and is a good conductor of heat. It is formed as.

Hereinafter, the effects of the above configuration will be explained.

The material to be melted 17 stored inside the furnace body 11 is transferred to the electrode 12
By applying a voltage to 13, it generates heat as an electric resistor, becomes molten slag 1B, and stays inside the furnace body 11. The molten slag 18 staying above the upper end opening of the cylinder body IB passes through the cylinder body IB to the slag discharge port 15.
taken from. At this time, the cylinder 16 is connected to the electrode 12.1.
3 and is made of the same material as the electrodes 12 and 13 and has a low electrical resistance, so the surface of the cylinder is self-heated by the convergence of the current and is also heated by the heat of the surrounding molten slag 18. For this purpose, the molten slag 1 passing through the cylinder 16
8 is not cooled and solidified, and the cylindrical body 16 and the slag discharge port I5 are prevented from being blocked. Further, since the molten slag 18 that remains below the upper end opening of the cylinder I6 does not flow out, the electrode 12.
An empty state around 3 is avoided, and the object to be melted 17 is constantly heated.

FIG. 2 shows another embodiment of the present invention, and members that perform the same functions as those in the previous embodiment are given the same reference numerals and their explanations will be omitted. A salt outlet 2 is provided at the bottom 14 of the furnace body 11.
0 is formed, and a second cylindrical body 21 is provided vertically inside the furnace body I2 surrounding the opening of this salt discharge port 2θ. This second cylindrical body 21 has a length reaching from the bottom 14 of the furnace body II to above the electrode 12.13.
．． 13 and the cylindrical body IB are made of the same material.

According to this configuration, the molten salt 19 eluted from the object to be melted 17 and floating on the molten slag I8 passes through the second cylinder 21 and is taken out from the salt discharge port 20. At this time, the second cylinder 21 is located between the electrodes 12.13, and the second cylinder 21 is located between the electrodes 12.13.
Since it is made of the same material and has low electrical resistance, the surface of the cylindrical body is self-heated by the focus of the current, and is also heated by the heat of the surrounding molten slag 18. For this reason, the molten slag I8 passing through the second cylindrical body 2I does not cool and harden, and the second cylindrical body 21 and the salt discharge port 20 are prevented from being blocked. Further, since the molten salt 19 and molten slag 18 that remain below the upper end opening of the second cylinder 21 do not flow out, the molten salt 19 and the molten slag 18 continue separately from the second cylinder 21 and the cylinder 16, respectively. It is taken out.

Effects of the Invention As described above, according to the present invention, since the cylindrical body is heated by the heat of the surrounding molten slag, the molten slag passing through the cylindrical body does not cool and solidify, thereby preventing blockage of the cylindrical body and the slag discharge port. It can be prevented. In addition, since the molten slag that accumulates below the upper opening of the cylinder does not flow out, it is possible to avoid an empty state near the electrodes that would occur due to excessive flow of molten slag in the furnace, and ensure continuous heating at all times. be able to.

Since the second cylindrical body is heated by the heat of the surrounding molten slag, the molten salt passing through the second cylindrical body does not cool and solidify, thereby preventing the cylindrical body and the slag discharge port from clogging. Furthermore, since the molten salt and molten slag that remain below the upper end opening of the second cylinder do not flow out from the second cylinder, the molten salt and molten slag are taken out separately and continuously from the second cylinder and the cylinder, respectively. be able to.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention, FIG. 2 is an overall configuration diagram showing another embodiment of the invention, and FIG. 3 is an overall configuration diagram of a conventional melting furnace. 11... Furnace body, 12.13... Electrode, I5... Slag discharge port, 1B... Cylindrical body, I7... Material to be melted, 1
8... Molten slag, 19... Molten salt, 20... Salt discharge port, 21... Second cylindrical body.

Claims (1)

[Claims] 1. In a melting furnace having an electrode on the side of the furnace body for melting a material to be melted stored inside the furnace body, a slag discharge port is provided at the bottom of the furnace body, and a slag discharge port is provided at the bottom of the furnace body. 1. A melting furnace characterized in that a cylindrical body is provided in a vertical direction inside a furnace body surrounding an opening of a slag discharge port, and is formed in a length reaching from the bottom of the furnace body to near the electrode. 2. In the melting furnace according to claim 1, a salt discharge port is provided at the bottom of the furnace body, and a second cylindrical body is provided vertically inside the furnace body surrounding the opening of the salt discharge port. A melting furnace characterized in that the melting furnace is formed in a length that reaches from the bottom of the electrode to above the electrode.