JPH02238286A - Melting furnace - Google Patents

Abstract

PURPOSE:To shorten a time ranging from starting operation to one in which a molten slag can be regularly taken out by a method wherein a cylinder composed of an electrical conductor having its one end fitted into a slag discharging port formed at a bottom part of a furnace and an auxiliary power supply device for use in applying an auxiliary electrical power between the cylinder and one electrode are provided. CONSTITUTION:A bottom part of a furnace 11 is formed with a slag discharging port 15, and a cylinder 16 composed of electrical conductor arranged in a vertical direction within the furnace 11 while its one end being fitted into a slag discharging port 15. Melted object 18 stored in the furnace 11 may receive a main electrical power applied between electrodes 12 and 13 through a main power supply device 14, generate heat and then the object may melt. The cylinder 16 is heated by heat of the molten slag. At this time, an auxiliary power is applied between the cylinder and one electrode by the auxiliary power supply device 17, the cylinder is directly heated, and a time required to cause the cylinder to reach a predetermined temperature is shortened. With such an arrangement, a time ranging from a starting of operation to a time when the molten slag can be regularly taken out is shortened.

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 arranged facing each other in the furnace body 1, and the electrodes 2 and 3 are connected to a main power supply device 4. Further, a slag discharge port 5 is formed at the bottom of the furnace body 1, and a cylindrical body 6 having one end fitted into the slag discharge port 5 is provided inside the furnace body 1 in the vertical direction. The material to be melted 7 stored inside the furnace body 1 is transferred to the electrodes 2.3.
Acts as an electrical resistor for the current applied between
Melts due to self-heating. Of the eluted molten slag 8, that which remains above the upper end opening of the cylinder 6 is taken out to the outside of the furnace body 1 through the cylinder 6.

Problems to be Solved by the Invention However, in the above-described configuration, there is a problem that the molten slag 8 solidifies near the outlet of the cylinder 6 because the cylinder 6 is not sufficiently heated at the beginning of operation. There was a problem in that it took time for the molten slag to be sufficiently heated and for the molten slag to be steadily taken out.

The present invention solves the above problems, and aims to provide a melting furnace that can shorten the time from the start of operation until it becomes possible to regularly take out molten slag.

Means for Solving the Problems In order to solve the above problems, the present invention includes a furnace body, a pair of electrodes provided protruding inside the furnace body and connected to a main power supply, and upper and lower electrodes provided inside the furnace body. An auxiliary power source that applies auxiliary power between a cylindrical body made of a conductor and one end of which is fitted into a slag discharge port formed at the bottom of the furnace body, and the cylindrical body and one electrode. The configuration includes a device.

In addition, the furnace body, a pair of electrodes protruding inside the furnace body and connected to the main power supply, and a slag exhaust disposed vertically inside the furnace body with one end formed at the bottom of the furnace body. A cylindrical body made of a conductor fitted into the outlet, an auxiliary electrode inserted into the cylindrical body, and an auxiliary power supply device that applies auxiliary power between the auxiliary electrode and the cylindrical body. It is structured as follows.

Operation With the above-described configuration, the material to be melted stored in the furnace body receives main power applied between the electrodes by the main power supply device, generates heat, and melts. Further, the cylinder body is heated by the heat of the melted molten slag. At this time, auxiliary power is applied between the cylinder and one electrode by an auxiliary power supply to directly heat the cylinder and shorten the time until the cylinder reaches a predetermined temperature. Therefore, the time from the start of operation until it becomes possible to regularly take out molten slag is shortened.

In addition, when the melting furnace is operated intermittently, if the molten slag remaining inside the cylinder solidifies, the auxiliary power supply device applies auxiliary power between the cylinder and the auxiliary electrode, and the cylinder Direct heating melts the solidified material inside the cylinder in a short time.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In the figure, a pair of electrodes 12, 13 are provided on the furnace body 11 facing each other, and the electrodes 12. 13 is connected to a main power supply device l4. This main power supply l4 is the electrode 1
2. Main power is applied between 13 and 13.

A slag discharge port l5 is formed at the bottom of the furnace body l1, and a cylindrical body 16 arranged vertically inside the furnace body 11 is provided with one end fitted into the slag discharge port l5. Furthermore, an auxiliary power supply device 17 is interposed between the cylindrical body te and one electrode 12. This auxiliary power supply device 17 applies auxiliary power between the cylindrical body 1B and the electrode 12.

The effects of the above configuration will be explained below.

With the material to be melted I8 stored inside the furnace body 11, the electrode 12. Apply main power during 13. Further, in the initial stage of operation, auxiliary power is applied between the cylindrical body 16 and one electrode 12 by the auxiliary power supply device 17, and the cylindrical rest 16 is directly heated. The material to be melted l8 that receives the main power generates heat as an electric resistor, melts and becomes molten slag, which overflows into the interior of the cylinder lB from the upper end opening of the cylinder l6 and flows from the slag discharge port I5 to the furnace body l1. taken outside. At this time, the cylindrical body I6 is heated by the heat of the molten slag, and is also heated in advance by the auxiliary power of the auxiliary power supply device 17, so that the cylindrical body I6 is heated until the cylindrical body IB reaches a predetermined temperature, that is, a temperature at which the molten slag does not solidify. Time is reduced. Therefore, the time from the start of operation to the steady removal of molten slag can be shortened. Also, when the molten slag reaches a predetermined temperature, an auxiliary power supply device is installed! The power supply by 7 is stopped, and thereafter the cylindrical body 1B is heated only by the heat of the molten slag and maintained at a predetermined temperature.

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. In FIG. 2, a cylindrical auxiliary electrode 2
1 is inserted into the cylindrical body IG, and the auxiliary electrode 2l and the cylindrical body 16 form a double tube. and,
An auxiliary power source 22 is interposed between the auxiliary electrode 21 and the cylindrical body l6, and the auxiliary power source 22 applies auxiliary power between the auxiliary electrode 16 and the cylindrical body l6.

In this configuration, the cylindrical body 16 and the auxiliary electrode 2 are
applying auxiliary power by an auxiliary power supply l7 during l;
The cylindrical body 16 is directly heated to shorten the time required for the cylindrical body 16 to reach a predetermined temperature, that is, a temperature at which the molten slag does not solidify. Further, when the melting furnace is operated intermittently, if the molten slag remaining inside the tube rest 16 solidifies, auxiliary power is applied between the tube body 16 and the auxiliary electrode 2l by the auxiliary power supply device 22. , the cylindrical body l6 and the solidified material inside the cylindrical body 16 are directly heated to melt the solidified material inside the cylindrical body in a short time.

At this time. The solidified material within the auxiliary electrode 2l is also heated and melted by thermal conduction. Therefore, the cylindrical body 1G is heated locally and efficiently, reducing wasted time at startup in continuous operation and intermittent operation, and improving operational efficiency.

Effects of the Invention As described above, according to the present invention, the cylindrical body can be directly and locally heated by the auxiliary power supply device, and molten slag can be taken out regularly after the start of operation. The time taken can be shortened. In addition, the molten slag that solidifies inside the cylinder during intermittent operation of the melting furnace is
By directly heating the cylindrical body using the auxiliary power supply, it is possible to melt the cylinder in a short time. Therefore, since the cylindrical body can be heated locally and efficiently, it is possible to reduce wasted time at the start of operation in continuous operation and intermittent operation, and to improve operational efficiency.

[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, 14...
Main power supply device, 15... Slag discharge port, IG... Cylindrical body, 17... Auxiliary power supply device, 18... Material to be melted.

Claims (1)

[Claims] 1. A furnace body, a pair of electrodes which are provided inside the furnace body to protrude and are connected to the main power supply, and which are arranged vertically inside the furnace body and have one end connected to the furnace body. A cylindrical body made of a conductor fitted into a slag discharge port formed at the bottom, and an auxiliary power supply device that applies auxiliary power between the cylindrical body and one electrode. Melting furnace. 2. A furnace body, a pair of electrodes that protrude inside the furnace body and are connected to the main power supply, and a slag exhaust that is arranged vertically inside the furnace body and has one end formed at the bottom of the furnace body. A cylindrical body made of a conductor fitted into the outlet, an auxiliary electrode inserted into the cylindrical body, and an auxiliary power supply device that applies auxiliary power between the auxiliary electrode and the cylindrical body. A melting furnace characterized by: