JPH08296825A - Incineration disposal method of waste - Google Patents

Abstract

PURPOSE: To provide an incineration disposal method which can prevent the generation of smoke and offensive odor when ashes generated by the dry distillation of wastes are discharged to facilitate the handling of the ashes. CONSTITUTION: Wastes A are housed into a gasification furnace 1, a part of the wastes A are burned and a combustible gas obtained by dry distillation of the left over is introduced into a burning furnace 2 to be burned completely almost at a constant temperature. After the completion of the dry distillation, the ashes in the gasification furnace 1 are massed together by pouring water thereinto as medium to be discharged out of the gasification furnace 1. The ashes B massed are housed into the gasification furnace 1 together with new wastes A to perform a reburning treatment thereof. Or unburned wastes are separated from the ashes B and subjected to a reburning treatment together with the new wastes A. After the removal of a part of water contained, the ashes B or the unburned ashes undergo the reburning treatment. The ashes B or the unburned wastes are positioned on the topmost layer of the new wastes A to perform the reburning treatment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for incinerating waste such as waste tires.

[0002]

2. Description of the Related Art As a method for incinerating waste such as waste tires, for example, Japanese Patent Laid-Open No. 13528/1990 by the present applicant.
A method using the dry distillation gasification incineration processing apparatus disclosed in Japanese Patent No. 0 is known.

In this dry distillation gasification incineration processing apparatus, while burning a part of the waste stored in the gasification furnace, the remaining heat of the waste is dry distilled (pyrolysis) by the heat of combustion to generate a waste product. A combustible gas produced by carbonization is introduced from a gasification furnace into a combustion furnace through a gas passage and is completely combusted, and the combustion temperature of the combustible gas in the combustion furnace is kept substantially constant. The amount of oxygen supplied to is controlled by feedback. According to the dry distillation gasification incineration apparatus, the waste is incinerated without causing environmental pollution, and finally the waste is completely burned and ashed.

At this time, the combustion of the waste in the gasification furnace is performed by gradually rising and moving from the lower side to the upper side to the site where the combustible gas is generated by carbonization. , The ash layer is left in the area where the combustion of the waste is completed. Then, when the dry distillation of the waste is completed, the entire amount of the input waste becomes an ash layer, and the incineration process ends.

When the incineration process is completed, the ash is discharged from the gasification furnace, but at this time, smoke or a bad odor may occur. This is because, depending on the combination of materials of the waste and the stacking state in the gasification furnace,
It is considered that a portion where combustion is not sufficiently performed locally occurs in the gasification furnace.

That is, if there is a portion where the waste is not combusted sufficiently, the waste in that portion has its surface ashed, but a lump that has a combustible portion left inside is left behind. Form. In the gasification furnace, the amount of oxygen is low because it is necessary to burn a part of the waste and dry-distill the rest, so that the whole lump does not ash, and the inside is slightly burned. It is left behind in the ash layer while continuing.

[0007] When the ash is discharged from the gasification furnace and comes into contact with the outside air after the incineration process is completed, the outside air is much more exhausted than the inside of the inside of the gasification furnace. Since the oxygen content is abundant, it is considered that the agglomerates again start vigorous combustion and generate smoke and malodor as described above.

Further, the ash is high in heat immediately after the end of the incineration process, and since fine particles of the ash are easily scattered, it is difficult to handle. Therefore, it is conceivable that the gas is sufficiently cooled in the gasification furnace and then discharged, but if this is done, there is a disadvantage that it takes a long time for cooling and the cycle of the incineration process becomes long. Moreover, even when cooled, the inconvenience that the fine particles are easily scattered and the handling is difficult cannot be solved.

[0009]

SUMMARY OF THE INVENTION In view of the above situation, the present invention is directed to the above-mentioned incineration when carrying out an incineration process in which a combustible gas obtained by dry distillation of the remainder while partially combusting the waste is completely combusted. It is an object of the present invention to provide a waste incineration treatment method capable of preventing the generation of smoke and offensive odors from the ash discharged after the end of treatment.

Another object of the present invention is to provide a method for incinerating waste, which can facilitate the handling of the ash.

[0011]

Therefore, the method of incinerating waste according to the present invention stores the waste in a gasification furnace and burns a part of the waste in the gasification furnace. When the rest of the waste is dry-distilled by the heat of combustion to generate a combustible gas, and the combustible gas is introduced from the gasification furnace into the combustion furnace through a gas passage and burned, While supplying oxygen required for complete combustion of combustible gas to the combustion furnace and adjusting the amount of oxygen supplied to the gasification furnace so as to maintain the temperature in the combustion furnace substantially constant, one of the waste In the method of incineration of waste for supplying oxygen required for combustion of the other part and dry distillation of the rest to the gasification furnace, after completion of the dry distillation, water is poured into the ashed product in the gasification furnace to water the ashed product. Integrated as a medium and discharged to the outside of the gasification furnace, and the integrated ash Characterized by re-incinerated accommodated in said gasification furnace with a new waste.

The waste incineration method of the present invention is
In the incineration method, after completion of the carbonization, water is poured into the ash in the gasification furnace, and the ash is integrated with water as a medium to be discharged to the outside of the gasification furnace to be integrated. It is characterized in that unburned waste contained in the ash is separated, and the unburned waste is stored in the gasification furnace together with new waste for reburning.

The integrated ash or the unburned waste is stored in the gasification furnace together with new waste after the removal of a part of water content in the reburning process. Further, the integrated ash or the unburned waste is stored in the gasification furnace so as to be located at the uppermost layer of new waste during the reburning process.

[0014]

According to the waste incineration processing method of the present invention, after the dry distillation is completed, water is poured into the ash in the gasification furnace. Even if the substance is completely extinguished and the ash is discharged outside the gasification furnace and brought into contact with the outside air, combustion does not start again. Further, since the ash is cooled by the water injection and is integrated with water as a medium, fine particles are prevented from scattering.

Next, the integrated ash is stored together with new waste in the gasification furnace and re-incinerated so that the combustible portion remaining inside the lump is completely ashed. Be converted.

At this time, the agglomerates are separated as unburned waste contained in the integrated ash, and only the unburned waste is stored in the gasification furnace together with new waste and re-used. By incineration, the combustible portion remaining inside the agglomerate is completely ashed, and the ash discharged after the re-incineration treatment is reduced.

In the re-incineration process, the integrated ash or unburned waste can be easily burned by removing a part of the water content. Further, at the time of the re-incineration treatment, the integrated ash or the unburned waste is stored in the gasification furnace so that it is located in the uppermost layer of new waste, and thus the lower layer part is obtained. Dried by heating from
The agglomerates are subdivided, and the combustible portions remaining inside are easily combusted.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The waste incineration method of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is a schematic system configuration diagram showing an example of a dry distillation gasification incineration processing apparatus used in the waste incineration processing method of the present invention. In addition, in FIG. 1, a part of the configuration is omitted for convenience of description.

In FIG. 1, 1 is a gasification furnace that stores waste A such as waste tires and FRP and dry-distills the waste A to generate combustible gas, and 2 is a combustible gas generated in the gasification furnace 1. A combustion furnace 3 for burning the volatile gas is a water injection means for injecting water into the gasification furnace 1.

The gasification furnace 1 comprises a furnace body 4 for containing waste A.
And a housing 5 that encloses the outer periphery thereof,
Base 7 via a plurality of legs 6 fixed to housing 5
Supported above. A water jacket 8 enclosing cooling water is formed between the furnace body 4 and the housing 5.

A charging port 9 for charging the waste A into the furnace body 4 is formed on the upper surface of the gasification furnace 1, and a charging door 10 for opening and closing the charging port 9 is provided in the charging port 9. Has been. Further, the lower part of the gasification furnace 1 is formed in a truncated cone shape projecting downward, and the ashed waste A after completion of the carbonization process is discharged from inside the furnace body 4 below the sloped side wall portion 11. An ash outlet 12 is formed therefor.

A space 13 is formed on the outer surface of the sloped side wall 11 so as to be isolated from the inside of the gasification furnace 1.
It is communicated with the inside of the gasification furnace 1 through a nozzle 14 provided in the. The vacant chamber 13 is connected to the oxygen supply source 15 via a conduit.

The ash outlet 12 is provided with a pair of bottom plates 16a and 16b which can be opened and closed. The bottom plates 16a and 16b are pivotally supported by hinge pins 18 of hinges 17a and 17b provided on both sides of the lower surface of the gasification furnace 1 in pairs. As a result, both bottom plates 16a, 1
6b is hinge pin 1 of hinges 17a and 17b, respectively.
It is possible to swing up and down around 8 as a fulcrum, and the swing allows the ash outlet 12 to open and close like a double door.

At the lower side of the gasification furnace 1, a furnace body 3 is provided.
Ignition device 1a for igniting waste A accommodated inside
Is provided.

An ash carrier 19 is provided below the ash outlet 12, and the ash carrier 19 has rollers 21, 21 on a pair of rails 20, 20 laid on the base 7.
It is movable in the direction perpendicular to the paper surface of FIG.

The combustion furnace 2 is connected and connected through a gas introduction path 23 to a connection port 22 provided in communication with the inside of the furnace body 4 on the upper side of the gasification furnace 1, and the gas introduction part thereof is connected. 2a includes an ignition device 2 for igniting the introduced combustible gas.
4 are provided. Further, for example, a boiler 25 that uses combustion heat of combustible gas as a heat source is connected to the gas combustion section 2b formed inside the combustion furnace 2 facing the gas introduction section 2a and the ignition device 24.

The water injection means 3 has a conduit 26 penetrating the upper side of the gasification furnace 1 and a conduit 26 outside the gasification furnace 1.
And an on-off valve 27 provided on the way. Conduit 26
Is equipped with a watering nozzle 28 at the tip in the furnace body 4, and is connected at the other end to a water source such as a water tank (not shown). Then, by opening the on-off valve 27, the water spray nozzle 28 to the furnace body 4
Water can be poured inside.

Next, the operation of the incinerator will be described.

First, the bottom plates 16a and 16b are closed, the waste A is charged into the furnace body 4 of the gasification furnace 1 through the charging port 9, and then the charging port 9 is closed by the charging door 10.
The inside of the furnace body 4 is sealed.

Next, the ignition device 1a provided in the gasification furnace 1 is activated to ignite the waste material in the lower part of the furnace body 4, and a part of the waste material A is started to be burned. The waste A on the upper side of the furnace body 4 is carbonized by the combustion heat. As a result, combustible gas is generated in the furnace body 4, and the combustible gas is guided to the combustion furnace 2 via the gas introduction passage 23.

Further, in the combustion furnace 2, the ignition device 2
The combustible gas introduced into the combustion furnace 2 is ignited by 4 and burned in the combustion section 2b of the combustion furnace 2. The combustion heat of the combustible gas is used as a heat source of the boiler device 25 to operate the boiler device 25.

During the dry distillation of the waste A in the gasification furnace 1 as described above, the waste A in the furnace body 4 from the oxygen supply source 15 through the vacant chamber 13 of the side wall 11 and the nozzle 14. The minimum amount of oxygen required to continue the partial combustion of is appropriately supplied. When the combustible gas is burned in the combustion furnace 2, oxygen is appropriately supplied in an amount corresponding to the amount of the combustible gas completely burned in the combustion furnace 2 through a pipe (not shown) connected to the combustion furnace 2. Supplied.
Then, in this case, the supply of air to the gasification furnace 1 is feedback-controlled according to the combustion temperature of the combustible gas so that the combustion temperature of the combustible gas in the combustion furnace 2 is maintained substantially constant. .

When the waste A is dry-distilled as described above, inside the furnace body 4 of the gasification furnace 1, as shown in FIG.
An ashed product layer a, a red heat layer b, a fluidized layer c, a heat transfer layer d, and a gas layer e are formed in order from the lower side to the upper side. Among these layers a to e, the red heat layer b in which the waste A is being burned is the fluidization layer c and the heat transfer layer in which the waste A is being carbonized from the lower layer to the upper layer. It gradually rises and shifts to part d, and along with this, waste A
The ash layer a generated by the completion of the combustion of No. 1 gradually increases. Further, with such an increase in the ash layer a and an increase in the red heat layer b, the fluidization layer c, the heat transfer layer d and the gas layer e in which the dry distillation of the waste A proceeds gradually decrease, and the dry distillation of the waste A is gradually reduced. When is completed, the whole becomes the ash layer a at last.

In this embodiment, when the dry distillation of the waste A is completed, the on-off valve 27 is opened, and the conduit 26 and the sprinkling nozzle 2 are opened.
Water is injected into the furnace body 4 via 8. In the dry distillation, it is desirable that all of the waste A put into the furnace body 4 is incinerated, but in reality, the materials of the waste A are combined and the degree of overlap between the wastes A in the furnace 4 and the like. As a result, the rise and transfer of the red heat layer b may become non-uniform, and the waste A is ashed on the non-uniform part but the unburned part remains inside. Form a thing.

When discharging the ash layer a
If there remains a lump that continues to burn slightly inside, as described above, the lump will come into contact with the oxygen-rich ambient air and start vigorous combustion again, resulting in smoke and A foul odor is generated.

However, in this embodiment, by the water injection,
The ash layer a becomes the ash B integrated with water as a medium, and the part of the lump that continues to be burned is completely extinguished. Therefore, as described above, smoke and a bad odor are generated. There is nothing to do. Further, since the ashed product B is cooled by the water injection and is not integrated and scattered, the handling after discharge is facilitated.

Then, next, both bottom plates 16a and 16b are swung like a double door as shown in phantom in FIG. 1, and the ash outlet 12 is opened, whereby the integrated ash B is transferred to the ash carrier. It is discharged to 19, and one cycle of the incineration process of waste A is completed.

Next, the integrated ash B is carried out by the ash carrier 19 and most of the water content contained therein is removed by a filtration means (not shown) or the like. It is thrown into 4. A filter press or the like is preferably used as the filtering means.

At this time, the integrated ash B is shown in FIG.
As shown in FIG. 5, the waste A is loaded so as to be located in the uppermost layer. Then, the waste A is subjected to dry distillation in the same manner as described above, so that the waste A is subjected to re-incineration treatment.

In this re-incineration treatment, since most of the moisture content of the integrated ash B is removed as described above, it is easy to heat the new waste A from the lower layer in the uppermost layer. The part that has been left unburned during the previous carbonization (incineration) is definitely carbonized and burned,
Incinerate. In the integrated ashed product B, when the water is removed, some water is left without being in an absolutely dry state, so that the remaining water is evaporated when the water is dried. To form bubbles, and the bubbles cause the agglomerates to be subdivided so that unburned portions remaining inside the agglomerates are easily burned.

In this embodiment, the water is sprayed from the sprinkling nozzle 28 provided in the upper part of the gasification furnace 1. However, the oxygen supply source 15 is switched to the middle of the conduit for supplying oxygen to the vacant chamber 13. A valve is provided so that the conduit is also connected to a water source (not shown), and when dry distillation of the waste A is completed, the switching valve is switched so that the conduit is connected to the water source, Water may be injected into the furnace body 4. By doing so, it is possible to check the clogging of the nozzle 14, and if there is clogging, it is possible to repair the clogging before re-incineration.

Further, in this embodiment, the whole amount of the integrated ash B is re-incinerated, but the lump B is separated from the integrated ash B as unburned waste. Alternatively, only the lumps may be re-incinerated with the new waste A as described above.

[0043]

As is apparent from the above, according to the waste incineration method of the present invention, when the ash generated by the dry distillation of the waste is discharged, smoke and a bad odor are generated from the ash. It can be surely prevented. Further, by separating unburned waste from the integrated ash and re-incinerating it with new waste, it is possible to reduce ash during re-incineration.

Further, since the ash is cooled by pouring water and is integrated with water as a medium, it does not scatter and can be easily handled.

[Brief description of drawings]

FIG. 1 is a schematic system configuration diagram showing an example of a dry distillation gasification incineration treatment device used in a waste incineration treatment method of the present invention.

[Explanation of symbols]

1 ... Gasification furnace, 2 ... Combustion furnace, 3 ... Water injection means, A ...
Waste, B ... Integrated ash.

Claims (4)

[Claims] 1. A waste gas is stored in a gasification furnace, and a part of the waste material is burned in the gasification furnace while the heat of combustion is used to dry-distill the remainder of the waste material to generate a combustible gas. When the combustible gas is introduced into the combustion furnace from the gasification furnace through the gas passage and burned, oxygen required for complete combustion of the combustible gas in the combustion furnace is supplied to the combustion furnace. Along with adjusting the amount of oxygen supplied to the gasification furnace so as to maintain the temperature in the combustion furnace substantially constant, oxygen necessary for combustion of a part of the waste and dry distillation of the rest is supplied to the gasification furnace. In the incineration treatment method of the waste to be supplied, after the completion of the dry distillation, water is poured into the ashed product in the gasification furnace, the ashed product is integrated by using water as a medium, and the ashed product is discharged to the outside of the gasification furnace. The converted ash is stored in the gasification furnace together with new waste and re-incinerated. A method for incinerating waste, characterized by: 2. A waste gas is stored in a gasification furnace, and a part of the waste material is burned in the gasification furnace while the heat of combustion is used to dry-distill the remainder of the waste material to produce a combustible gas. When the combustible gas is introduced into the combustion furnace from the gasification furnace through the gas passage and burned, oxygen required for complete combustion of the combustible gas in the combustion furnace is supplied to the combustion furnace. Along with adjusting the amount of oxygen supplied to the gasification furnace so as to maintain the temperature in the combustion furnace substantially constant, oxygen necessary for combustion of a part of the waste and dry distillation of the rest is supplied to the gasification furnace. In the incineration treatment method of the waste to be supplied, after the completion of the dry distillation, water is poured into the ash in the gasification furnace, and the ash is integrated with water as a medium to be discharged to the outside of the gasification furnace. The unburned waste contained in the integrated ash is separated and the unburned waste is regenerated. A method for incineration of waste, characterized in that the waste is stored together with fresh waste in the gasification furnace and re-incinerated. 3. The integrated ash or unburned waste should be stored in the gasification furnace together with new waste after the removal of a part of the water content, and then re-incinerated. The method for incinerating waste according to claim 1 or 2, characterized in that. 4. The integrated ash or the unburned waste is stored in the gasification furnace so as to be located on the uppermost layer of new waste and is re-incinerated. The method for incinerating waste according to any one of claims 1 to 3.