JPH06300242A - Take-out method and device of residual incineration ash - Google Patents

Abstract

PURPOSE:To prevent residual incineration ash from adhering on the wall of a combustion chamber, a hearth and a flue by a method wherein residual incineration ash is introduced into a tower, melted, cooled down and vitrified together with agglomerate substances, which have specified diameters and supplied into the tower along with ash, by hot air which has a specified temperature and supplied into the tower. CONSTITUTION:Crushed stones having a diameter 1cm or larger are introduced into a tower 1 from an agglomerate substance inlet 2 provided on an outer cylinder on top of the tower 1 and residual incineration ash of an incinerator is poured from a residual incineration ash inlet 3 provided on an inner cylinder on top of the tower 1. On the other hand, hot-air having an temperature 600-1700 deg.C is introduced into the tower 1 from a high-temperature air inlet 4 located at the upper part of the tower and exhaust gas is drawn from an exhaust gas outlet 5 located in the middle of the tower. A rotary disc is installed 30cm below an open bottom 7 of the tower 1 and rotated to withdraw agglomerate substances from the deposit layer. The molten residual incineration ash deposits on the surfaces of the agglomerate substances, is cooled down by cooling air supplied, solidified and vitrified and falls down as the agglomerate substances are rolling, so that the incineration residual ash is prevented from adhering on the tower bottom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for melting and removing a part or all of incineration residual ash.

[0002]

2. Description of the Related Art Conventionally, when waste is incinerated, harmful substances such as dioxins are often produced, and it is very difficult to remove them. Therefore, in order to suppress the production of such harmful substances, the incineration temperature is raised to, for example, 1100.
If the temperature rises to about ℃, it will damage the fire floor and make it difficult to use.
Further, heavy metal is contained in the incineration residual ash, and its disposal causes various environmental problems.

Here, if an incinerator such as a rotary kiln is used, the incineration temperature can rise, but the incineration residual ash remaining in the combustion exhaust gas generated in the incinerator or the like is exposed to high temperatures as a result of combustion. As a result, part or all of it melts, and if it is attempted to raise the incineration temperature, it solidifies and adheres on the walls of the combustion chamber or in the flue, etc. Causes clogging, and if it is forcibly removed, it damages the apparatus for combustion or incineration, which makes its handling difficult.

[0004]

DISCLOSURE OF THE INVENTION The present invention has solved the above-mentioned difficulties of the prior art. Conventionally, some or all of the combustion waste gas generated as a result of incineration in an incinerator is melted. Prevents the incinerated residual ash from sticking to the combustion chamber wall, fire bed or flue, or becoming glass and adhering.
An object of the present invention is to provide a method and an apparatus for taking out incineration residual ash that can be easily taken out by converting the incineration residual ash, which is partially or wholly contained in the waste gas, into a glass.

[0005]

The present invention includes: By supplying gravel-like substances with an average particle size of 1 cm or more and incineration residual ash into the tower and introducing high-temperature hot air at 600 ° C to 1700 ° C into the tower, the contact between the high-temperature hot air and the incineration residual ash is gravel-like. In the presence of a substance, a part or all of the incineration residual ash is melted, the gravel-like material is moved and cooled, and a part or all of the molten incineration residual ash is vitrified, and this is the gravel-like material. A method for melting and removing the incineration residual ash, which is characterized in that it is made to flow down from the bottom of the column.

2. In the tower, the incineration residual ash, which is a part or all of it made of glass, is sandwiched between the meshing parts of the blades with multiple teeth and passed through, and then flowed down from the bottom of the tower. The method for melting and taking out the incineration residual ash according to the item 1.

3. Along with the gravels that have flowed down from the bottom of the tower, the incineration residual ash, which is wholly or partly vitrified, is continuously extracted by using the moving flat member or a take-out member that uses a vibrating plate, using the angle of repose of the gravels. Alternatively, the method for melting and removing the incineration residual ash according to the above item 1 or 2, wherein the incineration residual ash is taken out by moving intermittently.

4. 600 ° C to 1700 ° C from the top of the tower
High temperature hot air is introduced, and cold air is introduced from the bottom or bottom of the tower to cool the gravel and the incineration residual ash in which part or all of it is melted, and the treated waste gas is forced from the middle or bottom of the tower. The method for melting and removing the incineration residual ash according to any one of 1 to 3 to be extracted.

5. 5. The method for melting and taking out incineration residual ash according to any one of claims 1 to 4, wherein combustion waste gas from an incinerator is used as all or part of high-temperature hot air at 600 ° C to 1700 ° C.

6. The melting of incineration residual ash according to any one of claims 1 to 5, wherein any one selected from glass pieces, carbonates, silicates or a combination thereof is used together with the incineration residual ash as a melting aid. How to take out.

7. An inlet for high temperature hot air near the top of the tower, an inlet for incineration ash and gravel with an average diameter of 1 cm or more at the top of the tower, an outlet for processing waste gas in almost the middle of the tower, and cold air at the bottom or bottom of the tower. And an outlet for taking out the incineration residual ash of which all or part is vitrified together with the gravel-like substance from the bottom of the tower, and a taking-out member at the lower part of the taking-out and separated from the taking-out member. The incineration is characterized in that there is a distance between the take-out port and the take-out member so that the incineration residual ash partially or wholly vitrified together with the gravel-like substance can be taken out by utilizing the angle of repose. A device for melting and removing residual ash.

8. Characterized by providing a blade meshing device with a plurality of teeth between the processing waste gas extraction port of the tower and the extraction port for taking out the incineration residual ash that is wholly or partly vitrified together with the gravels The apparatus for melting and removing ash from incineration according to Item 7.

In the present invention, the gravels that can be used are those having a high melting point, high impact strength, and those that do not break even if the gravels rub against each other.
Inorganic ceramics such as silicates and oxides, metals, or a mixture thereof can be used. Further, those having an average particle diameter of 1 cm or more can be used, preferably about 1 cm to 15 cm, and for example, crushed stone of natural mineral, zirconia or the like can be used.

Next, as the incineration residual ash that can be used in the present invention, along with combustion exhaust gas discharged from ordinary industrial waste, activated sludge, various plastics, various organic matter combustion furnaces, incinerators, etc. Is a residual solid component produced,
Generally, it contains a heavy metal.

Next, the high-temperature hot air that can be used in the present invention is 600 ° C. to 1700 ° C., preferably 9 ° C.
The hot air has a temperature of 00 ° C to 1400 ° C, and this high-temperature hot air is discharged from a gas produced by burning non-incineration organic matter, carbon, a carbon-containing compound, etc. with oxygen or air, or from various incinerators. Combustion waste gas etc. can be used.

Next, as the melting aid which can be used in the present invention, in addition to glass pieces, sodium carbonate, magnesium carbonate, limestone, potassium silicate, feldspar, talc, dolomite, kaolin, silica stone, etc. Carbonates and silicates can be preferably used.

Next, as the moving flat member for betting the take-out member which can be used in the present invention, for example, a rotating disk, a belt conveyor, a caterpillar or the like can be preferably used.

Next, the present invention will be described with reference to the drawings. Figure 1
FIG. 3 is a vertical cross-sectional view of an apparatus for carrying out the present invention. Figure 2
FIG. 1 is a schematic cross-sectional view of an example of a device with a take-out device having a multi-toothed blade interlocking portion for carrying out the present invention.

An apparatus for carrying out the present invention, as shown in FIG.
A gravel-like material having an average particle size of 1 cm or more is introduced from a gravel-like material inlet 2 provided in the outer cylinder of the tower 1. Further, the incineration residual ash is introduced from the incineration residual ash introduction port 3 provided in the inner cylinder in the upper part of the tower 1. A high-temperature hot air inlet 4 provided above the gravel-like material inlet 2 in the upper part of the tower 1, and further below this high-temperature hot air inlet 4, the waste gas is forcibly discharged in the middle part of the tower 1. Waste gas outlet 5 and cold air inlet 6 provided below it if necessary
Further, at the bottom of the tower 1, there is provided a take-out port 7 for taking out the incineration residual ash which is wholly or partially vitrified together with the gravel. This outlet 7 is also used as a cold air inlet in some cases.

On the projection surface which is located below the outlet 7 and apart from the outlet 7,
A take-out member 8, for example, a moving plane member or a vibrating plate member is provided, and the take-out port 7 and the taking-out member 8 such as the moving plane member or the vibrating plate member are wholly or partly together with the gravel-like object by utilizing the angle of repose. It is configured to have a distance such that the incineration residual ash that has become glass can be taken out.

The waste gas extraction hole 5 is provided at the bottom of the tower 1 instead of being provided at the center of the tower.
Although the processing waste gas is not shown, it can be forcibly withdrawn.

Depending on the case, as shown in FIG. 2, between the waste gas extraction port 5 and the cold air introduction port 6 or the extraction port 7 in the tower 1, together with the gravel-like matter, the whole or a part thereof was vitrified. The incineration residual ash can be processed by being sandwiched between the meshed portions of the blade having a plurality of teeth.

[0023]

The present invention uses the method and apparatus as described above. However, the gravel used in the present invention does not substantially change its material by the treatment of the present invention, The generated glassified incineration residual ash is removed by means such as sieving, and the gravel-like material can be repeatedly used as it is.

The gravel-like material used in the present invention is fed from the gravel-like material introduction port 2 and falls and moves while rotating due to gravity and the take-out means to cause mutual friction, and the take-out port 7 thereof.
Taken out.

The incineration residual ash introduced from the incineration residual ash introduction port 3 is wholly or partly melted by the high-temperature hot air introduced from the high-temperature hot-air introduction port 4 by this melting process, and then from the gravel-like substance introduction port 2. It is mixed with the gravel-like matter that has been sent in and adheres to the surface of the gravel-like matter, or exists in the vicinity of the gravel-like matter.

The incineration residual ash obtained by melting all or part of this is
Then, it is cooled by the introduced cool air such as air at normal temperature, and solidified and vitrified. Until the gravel is taken out, the incinerated residue ash that has become vitrified descends while swirling with the gravel and receives friction, so that the incinerated residue ash that becomes vitrified remains between the gravel particles. Collision, peeling, etc. are repeated and the particles become small particles.

The incineration residual ash thus taken out is partly or wholly solidified and is vitrified, so even if it contains heavy metals, the amount of elution is small, so disposal is also advantageous. It can withstand processing and use.

In some cases, as shown in FIG. 2, it was produced by sandwiching and removing the ash from the incineration residue ash, which is wholly or partly vitrified, together with the gravel-like matter, by sandwiching it in the meshing portion of the blade having a plurality of teeth. The incineration residue ash separates from the gravel and becomes small particles of moderate size.

[0029]

Example 1 An average diameter of 7 in a circular column having an effective diameter of 40 cm and a height of 3 m.
Gravel-like object inlet 2 with cm gravel (crushed stone) installed in the upper cylinder of the tower
Was introduced at a rate of approximately 100 kg / hr from the incinerator, and the incineration residual ash from the incinerator was introduced at 10 kg / hr from the incineration residual ash inlet 3 provided in the inner cylinder of the tower. At the top of the tower, hot air at 1400 ° C was blown at 3000 Nm ³ / from the hot air inlet located 70 cm from the top.
Introduced at a rate of hr, from the central part of the tower about 10,000 Nm ³ /
I exhausted the waste gas in hr.

A rotating disc having a diameter of 120 cm is provided at a position 30 cm below the open bottom 7 of the tower 1 to form a gravel deposit layer utilizing the angle of repose of the gravel between the rotating disc and the tower. Rotate the rotating disc at 30 RPM to remove about 100 kg of gravel from the accumulated layer.
It was sampled at a rate of / hr.

The gravel-like substance taken out from the bottom of the tower 1 and the small-sized and partially glass-like molten residual ash are sieved,
The gravel-like material is reused if necessary, and the molten residual ash, which is a small particle and a part or all of which is glass-like, is discarded and used for other purposes.

Using this apparatus, the glassy molten residual ash taken out together with the gravel was subjected to a dissolution test based on the Environmental Agency Notification No. 13, and the results shown in the following table were obtained.

[Table 1] Unit mg / L

As is clear from the above results, the above-mentioned molten incineration residual ash produced according to the present invention has a small amount of eluted heavy metal and is obtained in the form of small particles, so that its treatment is simple and advantageous.

[0034]

EFFECTS OF THE INVENTION The present invention uses the method and apparatus as described above. However, the gravel-like material used in the present invention can be repeatedly used as it is without the material being substantially changed by the treatment of the present invention. Is possible.

The gravel-like material of the present invention is fed from the gravel-like material introduction port 1, dropped and moved by gravity and used, and is not floated by air and used as a fluidized bed.
Therefore, the applicable range of the high temperature hot air used is wide, which is advantageous.

The incineration residual ash partially or wholly melted by the action of the introduced high temperature air in this apparatus adheres to the surface of the gravel-like material or exists in the vicinity thereof, and then the cold air introduced. It is cooled by (air at room temperature) and solidifies and vitrifies.

The solidified and vitrified molten residual ash adheres to the gravel-like material or exists in the vicinity thereof and drops downward while rotating in the tower 1, so that the molten residual ash is deposited on the tower wall. It can prevent adhesion.

The small granular incineration residual ash produced by incineration has a small elution amount even if it contains heavy metals, so that it is advantageous for disposal and can withstand processing and use.

In addition to the above, the present invention is advantageous in that the range of application of the high-temperature hot air used is wide. In addition, the molten residual ash produced in the present invention is in the form of small particles, so that it is easy to handle.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the apparatus of the present invention in which a gravel-like substance and an incineration residual ash that is wholly or partially vitrified are sandwiched between the meshing portions of a blade having a plurality of teeth and taken out.

[Explanation of symbols]

 1 Tower 2 Gravel-like Material Inlet 3 Incineration Residue Ash Inlet 4 High Temperature Hot Air Inlet 5 Waste Gas Outlet 6 Cold Air Inlet 7 Outlet 8 Ejecting Member

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[Procedure amendment]

[Submission date] October 27, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

Title: Method and apparatus for removing incineration residual ash

Claims (8)

[Claims] 1. A gravel-like material having an average particle diameter of 1 cm or more and incineration residual ash are fed into the tower, and high-temperature hot air at 600 ° C. to 1700 ° C. is introduced into the tower to obtain high-temperature hot air and incineration residual ash. Of the incineration residual ash is melted, the gravel is moved and cooled, and a part or all of the molten incineration residual ash is vitrified. And a gravel-like material from the bottom of the tower for melting and removing the incineration residual ash. 2. In the tower, after passing through the gravel-like substance, the incineration residue ash of which all or part is vitrified, sandwiched between the meshed portions of the blades having a plurality of teeth, and passed through the bottom of the tower. The method for melting and removing the incineration residual ash according to claim 1, wherein the molten ash is taken out. 3. An angle of repose of a gravel-like substance is obtained by using a moving flat member or a take-out member using a vibrating plate, together with the gravel-like substance flowing down from the bottom of the tower, the incineration residual ash whose whole or a part is vitrified. 3. The method for melting and taking out the incineration residual ash according to claim 1 or 2, wherein the method is used to move continuously or intermittently to take out. 4. High-temperature hot air at 600 ° C. to 1700 ° C. is introduced from the upper part of the tower, and cold air is introduced from the lower part or the bottom part of the tower to cool the gravels and the incineration residual ash in which part or all of the ash is melted, The method for melting and extracting the incineration residual ash according to any one of claims 1 to 3, wherein the processing waste gas is forcibly withdrawn from the center or the bottom of the tower. 5. The incineration residual ash according to any one of claims 1 to 4, wherein combustion exhaust gas from an incinerator is used as all or part of high-temperature hot air at 600 ° C to 1700 ° C. Melt removal method. 6. The method according to claim 1, wherein any one selected from glass pieces, carbonates, silicates or a combination thereof is used as a melting aid together with the incineration residual ash. Method for melting and removing ash from incineration. 7. An inlet for high-temperature hot air in the vicinity of the upper part of the tower, which has an inlet for incineration residual ash and gravel with an average diameter of 1 cm or more at the top of the tower,
There is a processing waste gas extraction port in almost the middle part of the tower, and a cold air inlet in the lower part or the bottom part of the tower, and the incineration residual ash that is wholly or partially vitrified is taken out together with the gravel from the bottom part A mouth, a lower part of this take-out port and apart from this take-out port, a take-out member is provided, and the angle of repose is used between the take-out port and the take-out member, and a part or all of it is vitrified together with the gravels. A melting and taking-out apparatus for incineration residual ash, characterized by having a distance such that the incineration residual ash can be taken out. 8. A device for interlocking blades having a plurality of teeth between a processing waste gas outlet of a tower and an outlet for taking out incineration residual ash of which all or part is vitrified together with gravels. The apparatus for melting and removing the incineration residual ash according to claim 7, which is provided.