JPS63315819A - Waste melting furnace - Google Patents

Abstract

PURPOSE:To smoothly take out a substance to be melted and disposed of without mounting a heating device for an exclusive use to a take-out part, by a method wherein a take-out part is disposed in the vicinity of the storage level of a substance to be melted and disposed of so that the substance to be melted and disposed of can be taken out through overflow, and a smoke passage is connected to the take-out part. CONSTITUTION:A take-out part 11 to take out a substance to be melted and disposed of through natural flow down from a secondary melting furnace is located in a secondary melting furnace 6, mounted to a plasma torch 5 and at a position in the vicinity of the storage level of the substance to be melted and disposed of so that the substance to be melted and disposed of can be taken out through overflow. A smoke passage 7 through which high temperature exhaust gas through a passage 4 is exhausted is connected to a take-out part 11. A rotary cooler 12 to continuously receive the overflowing dropping substance to be melted and disposed of, cool cooling air from the outside for cooling, and exhaust the cooling air to the outside of a system when its temperature is reduced to, for example, 900 deg.C, is situated below the take-out part 11, and slug discharged from the rotary cooler 12 is discharged in a crystallized and gradually cooled state.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides a method for connecting a melting chamber over its entire circumference to an annular supply channel through which the processed material is lowered under its own weight in a filled state, A passage for discharging the melted material together with high-temperature exhaust gas is provided in the center, a secondary melting furnace is provided for receiving and storing the melted material from the discharge passage, and the melted material from there is provided in the secondary melting furnace. The present invention relates to a waste melting furnace which is provided with a take-out portion for taking out the waste by gravity flow and is connected to a flue for discharging high-temperature exhaust gas from the discharge passage.

[Conventional technology]

In the conventional waste melting furnace mentioned above, the take-out part was arranged at the bottom of the secondary melting furnace, and the flue was connected to a position higher than the storage level of the melted material (for example, Japanese Patent Application Laid-Open No. 58-49824
Publication No.).

[Problem that the invention seeks to solve]

However, in order to smoothly take out the molten material from the take-out section, a special heating device must be installed in the take-out section to maintain the fluidity of the molten material, otherwise it will lose its fluidity due to natural heat radiation. Ta.

An object of the present invention is to make it possible to smoothly take out the melted product without providing a dedicated heating device in the take-out section.

[Means for solving problems]

The characteristic configuration of the waste melting furnace of the present invention is that the take-out part is disposed near the storage level of the melted product so as to take out the melted product by overflow, and the flue is connected to the take-out part, Its effects are as follows.

[For production]

In other words, the high-temperature exhaust gas from the secondary melting furnace flows into the flue through the take-out part and gives thermal energy to the melted material taken out by overflow from the take-out part, thereby maintaining the fluidity of the melted material.

〔Effect of the invention〕

Therefore, it is possible to smoothly take out the melted material while maintaining its fluidity without installing a dedicated heating device in the take-out section, and the simple structure reduces the initial cost and running cost of waste melting processing. I was able to do this.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in Fig. 1, the workpiece supplied from the supply reservoir (1) is distributed over the entire circumference by driving rotation of the lower part (2b) relative to the upper part (2a) of the outer peripheral wall (2) of the furnace. The melting chamber (3) is connected to the annular supply path (R) over its entire circumference, and the melting chamber (3) is connected to the annular supply path (R) over its entire circumference. 3) is provided with a passageway (4) in the center of the bottom for discharging the melted material together with the high-temperature exhaust gas, which receives and stores the melted material from the passageway (4) and removes unmelted materials contained in the melted material. A secondary melting furnace (6) equipped with a plasma torch (5) is provided to retain and completely melt the melt.
In the secondary melting furnace (6), a take-out part (11) for taking out the melted product from there by gravity flow is arranged near the storage level of the melted product so as to take out the melted product by overflow, and the passage ( Connect the flue (7) for discharging high-temperature exhaust gas from 4) to the extraction part (11), and
A waste heat recovery device (8) such as a boiler is installed downstream of the sewage sludge, raw sludge, municipal waste residue, and
A waste melting furnace is configured to melt plastic waste and other individual objects or mixtures thereof.

The plasma torch (5) includes a power receiving equipment (10) for discharging, and a process gas supply device (9) for ejecting a type of process gas such as air, nitrogen, argon gas, water gas, etc. to a heating target at high pressure. ), the process gas is turned into high-temperature plasma by discharge energy, and is blown out.
The processed material heated to ~1450°C is transferred to the secondary melting furnace (6)
The storage chamber (6A) inside is heated by plasma to 1500°C to 1600°C, and even unmelted materials are completely melted. still,
As the process gas, air is used if the processed material contains a large amount of organic matter, and nitrogen gas is used if the material contains a large amount of inorganic material.

The lower part of the take-out part (11) continuously receives the melted material that has overflowed and fallen, and cools it at a cooling rate of 2 to 900 m by supplying cooling air from the outside.
A rotary cooler (12) is provided, which is discharged from the system when the temperature reaches ℃.
The slag discharged from 2) is slowly cooled into crystals.

Note that the exhaust gas from the rotary cooler (12) is discharged into the flue via the exhaust gas duct (13).

The flue (7) has a knee-turn path (U) in which the high-temperature exhaust gas from the take-out part (11) flows downward together with the molten material and then knee-turns into the upper secondary combustion chamber (14). The secondary combustion chamber (14) is configured to completely burn unburned gas in the exhaust gas by supplying air from the outside.

In the figure (15), the fire resistance of the extraction part (11) is maintained by a water cooling jacket.

[Another example]

The plasma torch (5) may be one or more, and may be a combustion type heating burner.

As shown in Figure 2, the flue (7) is equipped with a low-temperature melting device (16) for dust containing low-boiling heavy metals recovered from the exhaust gas at the outlet of the secondary combustion chamber (14). It may be arranged on the downstream side to melt the dust using the thermal energy of the exhaust gas. In the figure, (17) is a dust supply device, and (18) is a slag transport device.

Furthermore, depending on how the slag melted at 1600° C. can be used, it may be possible to use a water-cooled fried conveyor other than the air-cooled rotary cooler (12), and the slag at this time is generally called slag slag.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the waste melting furnace according to the present invention.
The figure is a sectional view of the whole, and FIG. 2 is a sectional view showing another embodiment of the main part. (3)... Melting chamber, (4)... Passage,
(6)... Secondary melting furnace, (7)... Flue, (11)... Taking out part, (R)...
Circular supply channel.

Claims (1)

[Claims] Annular supply path (R) that lowers the processed material under its own weight in a filled state
A melting chamber (3) is connected to the melting chamber (3) over its entire circumference, and a passage (4) is provided at the center of the bottom of the melting chamber (3) for discharging the melted material together with high-temperature exhaust gas, and from the discharge passage (4) A secondary melting furnace (6) is provided for receiving and storing the melted material, and the secondary melting furnace (6) is provided with a take-out part (11) for taking out the melted material from there by gravity, A waste melting furnace is connected to a flue (7) for discharging high-temperature exhaust gas from the discharge passageway (4), and the waste melting furnace is configured to take out the melted product by overflowing the take-out section (11). a waste melting furnace located close to the storage level of the waste melting furnace, said flue (7) being connected to said removal point (11).