JPH09318035A - Device for melting and processing ignited ashe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure of a device, enable the device to be mounted at a low cost and further facilitate its maintenance by a method wherein a heat exchanger is installed between a multi-cyclone dust collector and a melting furnace and discharged smoke passed through the dust collector is washed with water by a Theisen washing machine. SOLUTION: Raw material ashes stored at a raw material ash stock yard 1 are combusted again and/or dried within the stock yard 1 as required and they are transferred into a hopper 5a by a predetermined amount by a transferring means 4 while they are being broken into fine substances by a screw conveyor 2c. They are fed into a melting furnace 5 by a specified amount through means 5b for cutting a specified amount and melted there. The ashes in a water- curushing type device are crushed with water and cooled and in turn the ashes in an air-cooling type device are naturally cooled. Discharged smoke containing a large amount of flying ashes discharged from the melting furnace 5 is cooled by a heat exchanger 10, reaches a multi-cyclone dust collector 12, garbages containing flying ashes are removed and reach a Theisen washing machine 13, washed with water there and further the garbages are removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly treats incinerated ash generated when incinerating waste such as general waste or industrial waste so as not to pollute the environment or to be reused. The present invention relates to a melting treatment device for incinerated ash.

[0002]

2. Description of the Related Art Garbage discharged from ordinary households and various factories is incinerated because it cannot be discarded as it is in order to prevent environmental damage and pollution. However, if the incineration ash generated at that time is discarded as it is, it will dissolve into the water and pollute the water, or the incineration ash will be scattered into the air by the wind and pollute the living environment. It is considered to melt and drop into water to recover slag for landfilling, or to reuse it as an aggregate of building materials.

As a device therefor, various devices are known in which the incinerated ash is melted in a melting furnace and then dropped into water to be water-granulated. In addition to the melting furnace, a crusher for crushing and finely crushing, and an incinerator / dryer for re-incineration are also provided before being accepted in. It is also equipped with a dust collector, an electric dust collector, and multiple layers of cooling devices for lowering the temperature of high-temperature smoke.

[0004]

Therefore, in the known device, the whole device inevitably becomes large in size, the manufacturing cost is high, and maintenance such as cleaning and parts replacement must be frequently performed. There was a problem.

An object of the present invention is to provide a melting treatment apparatus for incinerated ash, which has a simple structure, can be installed at a low manufacturing cost, and is easy to maintain.

[0006]

In order to achieve the above-mentioned object, the present invention provides a raw ash receiving stock yard having a refractory structure equipped with a screw conveyor, a melting furnace for melting raw ash, and a melting furnace attached to the melting furnace. A hopper for receiving raw ash provided with a fixed amount cutting means, a transfer means for transferring the raw ash in the stockyard to the hopper, and a dust containing fly ash in the flue gas discharged from the melting furnace. And a heat exchanger provided between the dust collector and the melting furnace, and a Taizen washer for washing the flue gas passing through the dust collector with water.

In this case, the present invention provides the melting furnace with either a water crushing means for molten ash or an air cooling means.

Then, the heat exchanger is of an air cooling type, and the hot air generated at that time is sent to a raw ash stockyard in order to reduce it to a melting furnace or reburn and / or dry unburned raw ash. Is.

Further, according to the present invention, means for automatically detecting the components of the flue gas discharged from the melting furnace can be installed in the flue gas flue.

[0010]

According to the first aspect of the invention, the raw ash stored in the raw ash receiving stockyard is reburned and / or dried in the stockyard of the fireproof structure, if necessary,
While being finely crushed by the screw conveyor, it is transferred into the hopper by a predetermined amount by the transfer means. Here, a fixed amount is sent into the melting furnace by a constant amount cutting means and melted, and the water granulation type is water granulated and cooled, while the air cooling type is naturally cooled. Exhaust smoke containing a large amount of fly ash discharged from the melting furnace is cooled by a heat exchanger and reaches a multi-cyclone dust collector, which removes dust containing fly ash and reaches a Taizen washer, which is further washed with water. Cyclone dust collector removes dust that has failed to be captured, and it is cooled and released to the atmosphere.

According to the second aspect of the invention, the raw ash melted in the melting furnace is dropped into water to be water granulated and recovered as fine gravel-like slag.

According to the third aspect of the invention, the raw ash melted in the melting furnace is stored in, for example, a bucket, and is solidified as a lump.

According to the present invention, the hot air is reduced to the inside of the melting furnace, so that the temperature inside the melting furnace can be prevented from lowering and the fuel can be omitted.

According to the present invention, the unburned raw ash in the raw ash receiving stockyard is incinerated, and the whole raw ash is dried so as to be easily melted in the melting furnace. .

According to the sixth aspect of the present invention, the concentration of the harmful substance in the flue gas can be automatically detected, so that the entire processing apparatus can be controlled.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of the present invention. In FIGS. 1 and 2, reference numeral 1 is a raw ash receiving stockyard. This raw ash receiving stockyard 1 has a storage tank 2 of an iron plate frame installed in a hole 1a made of concrete, and a fixed lid 2a and an opening / closing type storage tank 2 are provided at an open upper portion of the storage tank 2. The movable lid 2b is attached.
A pair of screw conveyors 2c, 2c are arranged side by side on the inner bottom of the storage tank 2, and the raw ash 3 stored inside is stored.
Is crushed into small pieces and sent to the outlet 2d.

Reference numeral 5 denotes a surface-flow-type melting furnace of a flow-down type,
A hopper 5a with a quantitative cutting means 5b is attached to one side of the melting furnace 5, and the raw ash sent from the outlet 2d via the screw conveyors 2c, 2c of the storage tank 2 for the raw ash 3 is A predetermined amount is received via a transfer means 4 such as a belt conveyor.

The raw ash supplied into the hopper 5a is fed into the melting furnace 5 through a fixed amount cutting means 5b such as a plunger device, and is inclined here though not shown here. While flowing down the hearth, it is melted by the high-temperature flame injected from the burner 5c, further flows down naturally, and falls into the water tank 6 accommodating the screw conveyor 6a. It is taken out by the conveyor 6 a, and further stored in the slag hook yard 8 via the belt conveyor 7. Although not shown, a truck such as a dump truck is guided to the lower portion of the slag stockyard 8 to open the hopper and load the finely crushed slug inside.

Reference numeral 10 denotes an air-cooling type heat exchanger, the internal structure of which is not shown, but for example, high-temperature flue gas discharged from the melting furnace 5 is passed through a thin tube, and is blown from outside by a blower 10a. It has a structure for cooling this thin tube.
Then, a part of the hot air generated at that time is reduced into the melting furnace 5 through the communication pipe 10b. Further, a part of the hot air is also sent into the storage tank 2 in the stockyard 1 via the communication pipe 20 shown by the imaginary line. Furthermore, if the heat exchanger is water-cooled, it will be possible to produce steam.

Reference numeral 12 is a multi cyclone dust collector. This multi-cyclone dust collector 12 is an improvement of the conventionally known cyclone dust collector. Although not shown, the flue area is divided into 3 to 4 parts so that the radius of smoke rotation becomes smaller, and the dust particles are more dusty than the conventional ones. It has been devised so that it can be collected. Compared with the electric dust collector, this multi cyclone dust collector does not need to cool the exhaust gas extremely. The flue gas cooled to some extent by the heat exchanger 10 is sent to the multi-cyclone dust collector 12 through the smoke pipe 11, where dust including fly ash is separated, and further sent to the Taizen washer 13 through the smoke pipe 9. To be Here, the dust containing fly ash that could not be collected by the multi-cyclone dust collector 12 is washed out from the flue gas and the temperature is lowered. This Taizen washer 13 is used by being circulated from a circulating water tank 17 containing a neutralizing agent such as lime nitrate, in which harmful substances such as sulfur oxides, nitrogen oxides or carbon monoxide are also removed. As a result, clean, low-temperature water vapor is further emitted to the atmosphere from the chimney 16 through the smoke pipe 19.

The smoke pipes 9 and 11 are for detecting harmful substances in the flue gas, for example, sulfur oxide detection means by IRA107 type machine manufactured by Shimadzu Corporation, carbon monoxide detection means by CGT101A type machine, or NOA305A. A detector such as a nitrogen oxide detector by a mold machine is attached to the control panel (not shown) to display the concentration of harmful substances and to display the temperature in the melting furnace based on this signal. It is also possible to automatically control the supply amount and supply rate of raw ash. Further, reference numeral 18 is a pipe for sending out water vapor containing fly ash generated from the molten material dropped into the water tank in the case of a melting furnace equipped with water granulating means.
The exhaust pipe 5d is connected to the smoke pipe 19 near the chimney 16.

FIG. 3 shows a melting furnace 21 equipped with air cooling means. Raw ash melted in the melting furnace 21 is melted by the melting furnace 21.
For example, the water is stored in the bucket 22 installed outside and stored down, and naturally left to be cooled.

[0023]

Since the present invention is constructed as described above,
The following operational effects can be obtained.

According to the first aspect of the present invention, the raw ash stockyard is simultaneously crushed by the screw conveyor and is supplied with hot air from the heat exchanger or the melting furnace to the storage tank of the refractory structure, so that a dedicated crushing means is provided. And an incinerator / dryer can be omitted, and since the cooling means provided in multiple layers that can cool high-temperature flue gas by the multi-cyclone dust collector is not required, the structure is simple and the manufacturing cost is low. It is a thing. Such a material which is once melted and solidified does not dissolve in water, and therefore there is no fear of polluting or destroying the environment even if it is discarded.

According to the second aspect of the invention, since the incineration ash becomes fine-grained slag, it can be reused as an aggregate for building materials such as concrete.

According to the third aspect of the present invention, the solidified slag can be crushed into an appropriate size to obtain a large-sized slag, which can be used as concrete aggregate, gravel for roads and other building materials. be able to.

According to the fourth and fifth aspects, the hot air is reused to save the fuel for heating the inside of the melting furnace and the fuel for reburning or drying the raw ash. Is something that can be done.

According to the sixth aspect, it is possible to prevent the release of harmful substances such as sulfur oxides, nitrogen oxides, or carbon monoxide into the atmosphere. .

[Brief description of drawings]

FIG. 1 is a plan view schematically illustrating a melting incineration ash melting apparatus according to the present invention.

2 is a partial cross-sectional front view of the device shown in FIG.

FIG. 3 is an explanatory view showing another embodiment of the melting furnace.

[Explanation of symbols]

 1 raw ash receiving stockyard 2 storage tank 2c screw conveyor 3 ash 4 transfer means 5,21 melting furnace 5a hopper 8 slag stockyard 9 smoke pipe 10 heat exchanger 10a blower 11 smoke pipe 12 multi-cyclone dust collector 13 Tanzen washer 14 smoke detection Unit 15 Smoke emission detector 16 Chimney

Claims (6)

[Claims] 1. A refractory raw ash receiving stockyard equipped with a screw conveyor, a melting furnace for melting raw ash, and a hopper for receiving raw ash equipped with a fixed amount cutting means attached to the melting furnace. , A transfer means for transferring the raw ash in the stockyard to the hopper, a multi-cyclone dust collector for separating dusts containing fly ash in the flue gas discharged from the melting furnace, and the dust collector and the melting furnace An incineration ash melting treatment apparatus comprising a heat exchanger provided between the dust collector and a Taizen washer for washing the flue gas passing through the dust collector with water. 2. The incinerator ash melting treatment apparatus according to claim 1, wherein the melting furnace is provided with a water granulating means for the molten material. 3. The apparatus for melting incineration ash according to claim 1, wherein the melting furnace is provided with a means for cooling the melt. 4. The incinerator ash according to any one of claims 1 to 3, wherein the heat exchanger is an air-cooled type, and further comprises means for reducing hot air generated at that time to a melting furnace. Melt processing equipment. 5. The heat exchanger is an air-cooled type, and is provided with a means for guiding hot air generated at that time to a raw ash stockyard and reburning and / or drying unburned raw ash. The incineration ash melting treatment apparatus according to any one of claims 1 to 4. 6. The method according to claim 1, wherein means for automatically detecting the components of the flue gas emitted from the melting furnace is installed in the flue gas duct of the flue gas. Incinerator melting treatment equipment.