JP3285692B2 - Fly ash treatment device in incinerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for treating fly ash in an incinerator which is trapped by a dust collector accompanying exhaust gas during incineration of municipal waste or the like.

[0002]

2. Description of the Related Art As a conventional method of treating fly ash, a cement solidification treatment method has been widely used. However, in recent years, it has become difficult to secure landfill sites, and there has been a demand for reducing the volume of incineration residues. I have. For this reason, fly ash is being studied for performing a melting treatment with a large volume reducing effect instead of cementing with a large solidification capacity.

[0003] Considering a flow for melting a fly ash in a conventional refuse incineration plant, the flow is as shown in FIG. That is, the exhaust gas discharged from the incinerator main body 1 via the boiler 2 is cooled in the temperature control tower 3, and then a chemical consisting of slaked lime, an auxiliary agent and activated carbon is added thereto, and the incinerator-side dry filtration dust collector ( The bag filter) 4 captures fly ash in the exhaust gas, and reactive salts (CaCl ₂ , Ca ₂ SO _4, etc.), unreacted chemicals (Ca (OH) _2, etc.), fly ash, collected heavy metals, etc. Gathered. The exhaust gas discharged from the incinerator-side dust collector 4 is discharged from the chimney 6 as a clean gas after nitrogen oxides are removed by the catalytic denitration device 5.

On the other hand, fly ash collected by the incinerator-side dust collector 4 and the temperature control tower 3 is shared with the main ash discharged from the incinerator main body 1 or fed into an ash melting furnace 7 dedicated to fly ash. The molten salt and slag are produced and disposed or reused. Further, after the molten exhaust gas discharged from the ash melting furnace 7 is cooled in the temperature control tower 8, a chemical consisting of slaked lime, an auxiliary agent, and activated carbon is added thereto, and the ash melting furnace side dry filter dust collector (bag filter) 9 is added. By fly ash and reactive salts, unreacted drug,
Fly ash, collected heavy metals, etc. are collected. The collected fly ash and the like are detoxified by the ash detoxification apparatus 10 by a cement solidification method or a chelation method. The exhaust gas discharged from the melting furnace side dust collector 9 is discharged from the chimney 6 as a clean gas.

[0005]

However, the fly ash treatment described above involves the following steps: (1) Since it is heated to a high temperature in an ash melting furnace, reactive salts and the like are gasified again to generate hydrogen chloride. However, since the chemicals are discharged together with the exhaust gas, the chemical must be introduced into the exhaust gas again and captured by the melting furnace side dust collector 9, so that twice the amount of the chemical is required. (2) Some of the salts contained in the fly ash form molten salts in the ash melting furnace 7, eroding the refractory bricks in the furnace and shortening the service life. In the case of granulated slag, if some of the salts elute, sewage discharge cannot be performed, and further detoxification treatment is required. (3) When calcium content in fly ash increases due to slaked lime, the basicity (CaO / SiO) increases, the melting temperature of the ash increases, the melting method is restricted, and the erosion of the refractory brick is accelerated. Further, there is a problem that heat energy consumed for melting the ash increases and the operating cost increases.

[0006] The present invention solves the above-mentioned problems, prevents the formation of salts in the ash melting furnace without increasing the amount of chemicals added, prevents erosion of refractory bricks, and reduces wastewater treatment. It is an object of the present invention to provide a fly ash treatment apparatus in an incinerator, which is unnecessary, does not have a high melting point, and can reduce operating costs.

[0007]

In order to solve the above-mentioned problems, a first means of the present invention is to provide an incinerator-side dust collector and a wet smoke cleaner in a discharge path of combustion exhaust gas discharged from an incinerator main body. And the equipment are arranged in order from the incinerator body side, and discharged from the incinerator body.
Main ash supplied to the ash melting furnace through the dryer
A supply device is provided and discharged from the dryer.
After collecting the dust from the drying exhaust gas with an exhaust gas cleaning device,
Introduced to the outlet of the incinerator body in the exhaust gas discharge path
A dry exhaust gas discharge pipe is installed to join the exhaust gas to the combustion exhaust gas, and a denitrification device is installed at the exhaust gas outlet side of the wet smoke cleaning device via an exhaust gas reheater that uses the heat medium of the boiler attached to the incinerator body as a heating source An ash melting furnace for heating and melting the fly ash supplied with the main ash supplied from the main ash supply device and the fly ash collected by the incinerator dust collector, and discharged from the ash melting furnace An ash melting furnace side dust collector for collecting fly ash from the molten exhaust gas to be discharged, and a combined exhaust gas pipe for introducing the molten exhaust gas discharged from the ash melting furnace side dust collector to an inlet of the wet type smoke cleaning device. Is provided.

[0008] The second means is that an incinerator-side dust collector and a denitrifier are provided in a discharge path of the combustion exhaust gas discharged from the incinerator main body.
The device and the wet smoke cleaning device are arranged in order from the incinerator body side,
Ash melts the main ash discharged from the incinerator body through a dryer
Provide a main ash supply device to supply to the furnace and
Dry exhaust gas discharged from the machine is dusted by an exhaust gas cleaning device.
After collecting the dust, the incinerator
Dry exhaust gas that is introduced into the outlet of the body and merges with the combustion exhaust gas
A dioxin trap is installed by installing a discharge pipe and using an electrostatic precipitator for the incinerator-side dust collector, and injecting only auxiliary agent and activated carbon into the exhaust gas at the inlet on the exhaust gas outlet side of the wet smoke cleaning device to collect dioxin. the dry filtration dust collector of use arranged, the main
An ash melting furnace in which the main ash supplied from the ash supply device and fly ash collected by the electrostatic precipitator are supplied to heat and melt the fly ash, and fly ash from the molten exhaust gas discharged from the ash melting furnace Ash melting furnace side dust collector for collecting the dioxin , and a combined exhaust gas pipe for introducing the molten exhaust gas discharged from the ash melting furnace side dust collector to the inlet of the wet smoke washer is provided. for
Fly ash collected by a dry filtration dust collector in Japan
A fly ash collection pipe is provided .

[0009]

According to the first configuration, harmful gas components such as low-boiling heavy metals and hydrogen chloride contained in the combustion exhaust gas discharged from the incinerator main body are collected by the wet-type smoke cleaning device. fly ash containing no salts are generated from harmful gas components in incinerator side dust collector is collecting, the fly ash and incinerator
By this <br/> and heating and melting the bottom ash discharged from the body in ash melting furnace, no generation of hydrogen chloride during melting of the ash in the ash melting furnace, the hydrogen chloride trapping agents to the molten exhaust gas No need to input. In addition, since salts are not eluted, the service life of the refractory brick is not shortened, and even in the case of granulated slag, sewage can be discharged without eluting salts into the cooling water. Furthermore, since the calcium content in the fly ash is small, it is possible to cope with various melting methods without increasing the melting temperature, which can contribute to a reduction in operating costs. Thereby, volume reduction of main ash and fly ash can be achieved. In addition , the fly ash can be melted at the same time as the main ash, so equipment costs
Can be reduced.

Further, since the molten exhaust gas after dust collection is merged with the inlet of a wet-type smoke washing device provided in the exhaust gas discharge path, a harmful substance removing device dedicated to the molten exhaust gas becomes unnecessary, and the equipment cost is reduced. be able to.

Further, the exhaust gas whose temperature has been reduced by the wet-type smoke cleaning device is heated to a temperature suitable for denitration by using a heating medium of a boiler attached to the incinerator main body, so that the exhaust heat is efficiently used. It is possible to remove nitrogen oxides from exhaust gas without increasing operating costs.

According to the second configuration, harmful gas components such as low-boiling heavy metals and hydrogen chloride contained in the flue gas discharged from the incinerator main body are collected by the electrostatic precipitator. Without lowering the exhaust gas temperature
The incinerator-side dust collector collects fly ash that does not contain salts generated from harmful gas components and discharges this fly ash and the incinerator body.
By heating and melting the main ash to be melted in an ash melting furnace,
There is no generation of hydrogen chloride when melting the ash in the ash melting furnace,
It is not necessary to add a chemical for collecting hydrogen chloride to the molten exhaust gas. In addition, since salts do not elute, without shortening the life of the refractory brick, even when granulated slag,
It is possible to discharge sewage without eluting salts into the cooling water. Furthermore, since the calcium content in the fly ash is small, it is possible to cope with various melting methods without increasing the melting temperature, which can contribute to a reduction in operating costs. Thereby, the volume of fly ash can be reduced. Melt fly ash at the same time as main ash
Since the melting process can be performed, equipment costs can be reduced.

[0013] Further, since the molten exhaust gas after dust collection is merged with the inlet of the wet smoke cleaning device provided in the exhaust gas discharge path, a harmful substance removing device dedicated to the molten exhaust gas becomes unnecessary, and the equipment cost is reduced. be able to.

Further, since the dust collector for collecting fly ash from the combustion exhaust gas is an electrostatic precipitator, the exhaust gas can be introduced and the fly ash can be collected without lowering the temperature. Compared to arranging a dry filtration dust collector which needs to be lowered, the heat efficiency is good and energy saving operation is possible.

[0015] Further, discharged from the electrostatic precipitator.
Directly introduce flue gas with a small temperature drop into the denitration equipment
Can improve thermal efficiency
You.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a refuse incinerator according to the present invention will be described with reference to FIG. The same members as those in the related art are denoted by the same reference numerals, and description thereof will be omitted.

In this first embodiment, a mixed molten shell of fly ash and main ash is used.
In the flue gas discharge path 11 for discharging flue gas from the incinerator body 1 with the stem , the first
A temperature control tower 3, a bag filter 12, which constitutes an incinerator-side dry filtration dust collector, a wet smoke washing device 13, an exhaust gas reheater 14, and a catalytic denitrification device 5 are arranged respectively. A second exhaust gas discharge path 22 for discharging molten exhaust gas from an ash melting furnace 21 that melts fly ash is provided with a second temperature control tower 23.
And the ash melting furnace side dust collector 24 are interposed.

The bag filter 12 has a temperature of combustion exhaust gas suitable for capturing dioxin by the first temperature control tower 3, that is, 200 ° C. or lower, preferably 150 to 170 ° C.
Activated carbon and an auxiliary agent alone are blown into the flue gas cooled to ° C. as chemicals just before the entrance. The auxiliary agent is for pre-coating a filter cloth of a bag filter to increase air permeability and prevent burning, and a powder containing diatomaceous earth as a main component is used. Therefore, in the flue gas, since the injected chemical does not contain slaked lime [Ca (OH) ₂ ], calcium chloride (CaCl ₂ ) as a reaction product and unreacted chemical [Ca
Fly ash containing almost no (OH) ₂ ] is collected.

The wet smoke cleaning device 12 treats combustion exhaust gas after dust collection and a molten exhaust gas which will be described later. Spray water into the exhaust gas to elute water-soluble components and lower the temperature of the exhaust gas. It condenses metals in the exhaust gas and removes HCl, SO _x , Hg, etc. from the exhaust gas. The drained aqueous solution containing HCl, SO _x , Hg and the like is separated and removed by the waste water treatment device 15 by a known technique.

The exhaust gas reheater 14 uses the heat medium vapor obtained in the boiler 2 to reduce the temperature of the exhaust gas reduced by the wet type smoke cleaning device 12 to a temperature suitable for denitration by a catalyst, that is, about 210 ° C. And then heated to a catalytic denitration device 5
Is to be introduced.

The main ash discharged from the melting furnace main body 1 is subjected to an ashes treatment.
Sprayed water-cooled or sprayed by the controller 31
The main ash cooled by water and cooled with water is supplied to the drying device 32.
After being introduced and dried, it consists of a scraper conveyor
Fly ash supplied to the ash melting furnace 21 by the main ash supply device 33
And melted together. In addition, main cooled by spray water
Ash is directly supplied to the ash melting furnace 21 by the main ash supply device 33
Is done.

The main ash is discharged from the drying device 32 during drying.
The dried exhaust gas is dried by the exhaust gas cleaning device 34.
Cyclone type dust collector 34a for coarse dust and bagh for fine dust
After the dust is collected through the filter 35b,
The scan discharge pipe 36, a boiler 2 of the combustion exhaust gas path 11
It flows between the first temperature control towers 3 and is combined with the combustion exhaust gas.
You.

The ash melting furnace 21 is collected by the first temperature control tower 3 and the bag filter 12 and carried by a fly ash supply device 25 comprising a scraper conveyor device, and is carried by a main ash supply device 33. The main ash is heated and melted to form a slag. The ash melting furnace 21 is of a burner type or an electric type (arc type, plasma type, electric resistance type, etc.). At this time, the fly ash hardly contains calcium chloride (CaCl ₂ ), which is a reaction product of slaked lime, so that molten chloride is not formed without regenerating hydrogen chloride and corrosion of refractory bricks is prevented. There is no increase.

The melting furnace-side dust collector 24 into which the molten exhaust gas cooled by the second temperature control tower 23 is introduced may be of a compact type such as a cyclone type, an electrostatic type, or a dry filtration type. For example, dust containing low-boiling metals, such as mercury, lead, and zinc, which are scattered at the time of melting are collected by a melting furnace-side dust collector 24 formed of a bag filter, and are treated by the detoxifying device 26 and discarded. You.

The molten exhaust gas discharged from the melting furnace-side dust collector 24 is introduced into the inlet of the wet-type smoke cleaning device 13 through a combined exhaust gas pipe 27 provided in the combined exhaust gas path, and is treated together with the combustion exhaust gas. Is done.

In the above configuration, the combustion exhaust gas generated in the incinerator body 1 is recovered in the boiler 2, cooled in the first temperature control tower 3 and introduced into the bag filter 12. The fly ash collected by the filter cloth of the bag filter 12 and the fly ash collected by the first temperature control tower 3 are supplied to the ash melting furnace 21 by the fly ash supply device 25. At the same time, incinerator body 1
The main ash discharged through the ash processing device 31
32 to the ash melting furnace 21 via the main ash supply device 33
Is done. The slag is heated and melted in the ash melting furnace 21 to form slag to reduce its volume, and dioxin is thermally decomposed at a high temperature, and the slag is reused or dumped in a landfill. The molten exhaust gas generated in the ash melting furnace 21 is:
After the low-melting-point metals and the like are collected by the ash-melting-furnace-side dust collector 24 interposed in the molten exhaust gas discharge path 22, they are introduced into the wet-type smoke cleaning device 13 through the combined exhaust gas pipe 27 and are treated together with the combustion exhaust gas. Is done. The dust and fly ash collected in the ash melting furnace side dust collector 24 and the second temperature control tower 23 are detoxified by a cement solidification method or a chelate method by an ash detoxification processing device 26 and discarded. . Wet smoke cleaning equipment 1
In 3, chlorine gas, sulfide, mercury and the like contained in the combustion exhaust gas and the molten exhaust gas are collected, and the aqueous solution containing them is treated by the waste liquid treatment device 15. Further, the exhaust gas heated by the exhaust gas reheater 14 is supplied to a catalytic denitration device 15.
Then, the nitrogen oxides are removed and discharged from the chimney 6 as clean gas.

According to the first embodiment, the harmful gas components such as low-boiling heavy metals and hydrogen chloride contained in the combustion exhaust gas discharged from the incinerator main body 1 are subjected to the wet-type smoke cleaning device 13.
At the entrance, only auxiliary agent and activated carbon are blown into the combustion exhaust gas, and the bag filter 12 collects salt-free fly ash and dioxin that do not contain salts generated from harmful gas components. Since the ash is melted by heating in the ash melting furnace 21, there is no generation of hydrogen chloride or the formation of molten salts during the ash melting, and it is not necessary to add a chemical for collecting hydrogen chloride from the molten exhaust gas. There is no increase in the amount of erosion and shortening of the service life. Further, even when the molten ash is converted into granulated slag, the molten salt is not mixed into the cooling water, so that the sewage can be discharged without detoxifying the cooling water. Furthermore, since the calcium content in the fly ash is small, the melting temperature of the fly ash does not rise, so that it is not necessary to make the specifications of the ash melting furnace and the material of the refractory brick compatible with high temperatures. The amount of brick erosion is small. Therefore, while reducing the volume of fly ash,
This can contribute to a reduction in equipment costs and operation costs, and can reduce the number of maintenance operations.

Further, since the molten exhaust gas collected by the second bag filter 24 is introduced into the wet smoke cleaning device 13 through the combined exhaust gas pipe 27 and processed together with the combustion exhaust gas, harmful substances exclusive to the molten exhaust gas are removed. No equipment is required, and equipment costs can be reduced. Furthermore, dioxin is collected together with fly ash by the bag filter 12, HCl, SO _x , Hg and the like are removed from the exhaust gas by the wet smoke cleaning device 13, and NO ^x is removed by the catalytic denitration device 5 to make the gas harmless. Can be achieved. In addition, the exhaust gas whose temperature has been reduced by the wet smoke cleaning device 13 is heated to a temperature suitable for denitration in the exhaust gas reheater 14 by using the heat medium of the boiler attached to the incinerator main body, so that it is efficiently used. The exhaust heat can be used, and the operation cost does not increase.

Further, fly ash can be melted simultaneously with the main ash.
Therefore, equipment costs can be reduced and the existing ash melting furnace can be used.
Thus, the fly ash can be melted. FIG. 2 shows a second embodiment of a mixed melting system of main ash and fly ash for the purpose of energy saving. In the second embodiment , in order to collect fly ash with a bag filter, the temperature of the high-temperature combustion exhaust gas discharged from the incinerator main body 1 through the boiler 2 is controlled by the first temperature control tower 3.
The problem of having to be cooled by using an electric dust collector (electrostatic dust collector) 42 that can collect fly ash from high-temperature exhaust gas has been solved to improve thermal efficiency. It is.

That is, in the combustion exhaust gas discharge path 41, in order from the incinerator main body 1, an electric dust collector (electrostatic dust collector) 42, a catalytic denitration device 5, a wet smoke cleaning device 13, and an exhaust gas reheater 43. And a dioxin trapping bag filter 44.

In the above structure, the combustion exhaust gas discharged from the incinerator main body 1 is recovered in heat by the boiler 2, then introduced into the electric precipitator 42 to collect fly ash, and further introduced into the catalytic denitration device 5. To remove nitrogen oxides. Fly ash collected by the electric dust collector 42 is supplied to the ash melting furnace 21 by the fly ash supply device 25, and is simultaneously discharged from the incinerator main body 1.
The obtained main ash is supplied to the main ash supply device 33 via the dryer 32.
Is supplied to the ash melting furnace 21. Then, the slag is heated and melted in the ash melting furnace 21 to form slag, which is reduced in volume, and is reused or dumped in a landfill. The molten exhaust gas generated in the ash melting furnace 21 is collected by the ash melting furnace side dust collector 24 interposed in the molten exhaust gas discharge path 22 to collect low melting point metals and the like, and passes through the combined exhaust gas pipe 27 in the combined exhaust gas path. And is introduced into the wet smoke cleaning device 13 and processed together with the combustion exhaust gas.
The dust collected by the ash melting furnace side dust collector 24 is harmlessly treated by an ash detoxification treatment device 26 by a cement solidification method or a chelation method, and is discarded. Wet smoke cleaning equipment 13
In this process, chlorine gas, sulfide, mercury and the like contained in the combustion exhaust gas and the molten exhaust gas are collected, and the aqueous solution containing them is treated by the waste liquid treatment device 15. Further, the exhaust gas heated by the exhaust gas reheater 43 is introduced into a dioxin trapping bag filter 44, where the dioxin is adsorbed by the auxiliary and activated carbon blown in at the inlet, and is removed by a filter cloth. The collected dioxin and fly ash are put into the ash melting furnace 21 through the fly ash collection pipe 45, and the dioxin is thermally decomposed by heat of fusion. The exhaust gas is discharged from the chimney 6 as a clean gas.

According to the second embodiment , the electric precipitator 42
Since the fly ash collected by the ash melting furnace 21 does not contain any reactive salts or unreacted chemicals, there is no generation of hydrogen chloride or generation of a molten salt at the time of melting by the ash melting furnace 21, and the same as in the first embodiment. The effect can be realized.

Further, since the electric precipitator 42 is disposed at the outlet from the incinerator main body 1, cooling of the combustion exhaust gas by the first temperature control tower 3 required for the dry filtration precipitator can be eliminated, and the electric precipitator can be used. The exhaust gas temperature at the outlet of the dust container 42 is also 230 to 20.
The temperature becomes 0 ° C., and the flue gas can be directly introduced into the catalytic denitration device 5 for denitration without having to raise the temperature of the flue gas by the exhaust gas reheater as in the first embodiment. Therefore, it is possible to improve thermal efficiency and promote energy saving.

In the second embodiment , the wet smoke cleaning device 13 is used.
The exhaust gas discharged from the exhaust gas is heated and dehumidified by an exhaust gas reheater 43 and introduced into a dioxin trapping bag filter 44. The temperature rise of the exhaust gas by the exhaust gas reheater 44 is suitable for dioxin removal. The heating temperature may be about 140 to 150 ° C. which can prevent generation of white smoke, and may be considerably lower than the heating temperature of 210 ° C. by the exhaust gas reheater 14 in the first embodiment.

Further, fly ash can be melted simultaneously with the main ash.
Therefore, equipment costs can be reduced and the existing ash melting furnace can be used.
Thus, the fly ash can be melted.

[0036]

As described above, according to the first aspect of the present invention, harmful gas components such as low-boiling heavy metals and hydrogen chloride contained in the combustion exhaust gas discharged from the incinerator main body are wet-washed. By collecting it with a smoke device, the incinerator-side dust collector collects fly ash that does not contain salts generated from harmful gas components, and this fly ash and main ash discharged from the incinerator main body
Is heated and melted in an ash melting furnace, so that there is no generation of hydrogen chloride when the ash is melted in the ash melting furnace, so that it is not necessary to add a hydrogen chloride collecting agent to the molten exhaust gas. In addition, since salts are not eluted, the service life of the refractory brick is not shortened, and even in the case of granulated slag, sewage can be discharged without eluting salts into the cooling water. Furthermore, since the calcium content in the fly ash is small, it is possible to cope with various melting methods without increasing the melting temperature, which can contribute to a reduction in operating costs. Thereby, the volume of the main ash and the fly ash can be reduced. In addition , fly ash is melted simultaneously with the main ash.
Equipment cost can be reduced.

Further, since the molten exhaust gas after dust collection is merged with the inlet of the wet smoke washing device provided in the exhaust gas discharge path, a harmful substance removing device dedicated to the molten exhaust gas becomes unnecessary, and the equipment cost is reduced. be able to.

Furthermore, the exhaust gas whose temperature has been reduced by the wet smoke cleaning device is heated to a temperature suitable for denitration by using the heat medium of the boiler attached to the incinerator body, so that the exhaust heat is efficiently used. It is possible to remove nitrogen oxides from exhaust gas without increasing operating costs.

According to the second configuration, harmful gas components such as low-boiling heavy metals and hydrogen chloride contained in the combustion exhaust gas discharged from the incinerator main body are collected by the electrostatic precipitator. Without lowering the exhaust gas temperature
The incinerator-side dust collector collects fly ash that does not contain salts generated from harmful gas components and discharges this fly ash and the incinerator body.
By heating and melting the main ash to be melted in an ash melting furnace,
There is no generation of hydrogen chloride when melting the ash in the ash melting furnace,
It is not necessary to add a chemical for collecting hydrogen chloride to the molten exhaust gas. In addition, since salts do not elute, without shortening the life of the refractory brick, even when granulated slag,
It is possible to discharge sewage without eluting salts into the cooling water. Furthermore, since the calcium content in the fly ash is small, it is possible to cope with various melting methods without increasing the melting temperature, which can contribute to a reduction in operating costs. Thereby, the volume of fly ash can be reduced. Melt fly ash at the same time as main ash
Since the melting process can be performed, equipment costs can be reduced.

Further, since the molten exhaust gas after dust collection is merged with the inlet of the wet smoke washing device provided in the exhaust gas discharge path, a harmful substance removing device dedicated to the molten exhaust gas becomes unnecessary, and the equipment cost is reduced. be able to.

Further, since the dust collector for collecting fly ash from the combustion exhaust gas is an electrostatic precipitator, the exhaust gas can be introduced and the fly ash can be collected without lowering the temperature. Compared to arranging a dry filtration dust collector which needs to be lowered, the heat efficiency is good and energy saving operation is possible.

Further, the dust is discharged from the electrostatic precipitator.
Directly introduce flue gas with a small temperature drop into the denitration equipment
Can improve thermal efficiency
You.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of a refuse incinerator facility according to the present invention.

FIG. 2 shows the configuration of a second embodiment of the refuse incinerator facility according to the present invention .
It is a block diagram showing composition.

FIG. 3 is a block diagram showing a configuration of a conventional refuse incinerator facility.
It is.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Incinerator main body 2 Boiler 3 1st temperature control tower (temperature control tower) 5 Catalytic denitration device 6 Chimney 11 Melt exhaust gas discharge route 12 Bag filter 13 Wet smoke washing device 14 Exhaust gas reheater 21 Ash melting furnace 22 Melt exhaust gas discharge route 23 Second temperature control tower 24 Ash melting furnace side dust collector 25 Fly ash supply device 27 Combined exhaust gas pipe 31 Ash treatment device 32 Drying device 33 Main ash supply device 34 Dry exhaust gas cleaning device 35 Dry exhaust gas discharge route 41 Combustion exhaust gas discharge route 42 Electrostatic dust collector 43 Exhaust gas reheater 44 Bag filter for dioxin collection

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI F23J 1/00 ZAB B01D 53/36 101A B09B 3/00 ZAB (72) Inventor Tadao Murakawa 5-chome Nishikujo, Konohana-ku, Osaka-shi, Osaka No. 3-28 Inside Hitachi Zosen Corporation (72) Inventor Hiroshi Onishi 5-28 Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture 3-72 Inside Hitachi Zosen Corporation (72) Akiko Narita Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture 5-3-28 Hitachi Zosen Corporation (56) References JP-A-5-237339 (JP, A) JP-A-4-277005 (JP, A) JP-A-4-300628 (JP, A) Yoshida Masanobu, Ed., "Waste Treatment / Recycling Technology and Effective Utilization" (May 20, 1992) Training companies and industrial technologies (58) Fields surveyed (Int. Cl. ⁷ , DB name) B09B 3 / 00 B01D 53/34 B01D 53/70 B0 1D 53/86 B01D 53/94 F23J 1/00 ZAB

Claims (2)

(57) [Claims] An incinerator-side dust collector and a wet-type smoke-cleaning device are disposed in order from the incinerator main body in a discharge path of the combustion exhaust gas discharged from the incinerator main body , and main ash discharged from the incinerator main body is provided. The ash melting through the dryer
Provide a main ash supply device to supply to the furnace and
Dry exhaust gas discharged from the machine is dusted by an exhaust gas cleaning device.
After collecting the dust, the incinerator
Dry exhaust gas that is introduced into the outlet of the body and merges with the combustion exhaust gas
A discharge pipe is provided, and a denitration device is provided on the exhaust gas outlet side of the wet-type smoke cleaning device via an exhaust gas reheater using a heat medium of a boiler attached to the incinerator body as a heating source, and supplied from the main ash supply device. and ash melting furnace fly ash trapped in bottom ash and incinerator side precipitator is supplied to heat and melt the fly ash, ash collecting fly ash from molten exhaust gas discharged from the ash melting furnace A melting furnace-side dust collector; and a combined exhaust gas pipe for introducing molten exhaust gas discharged from the ash melting furnace-side dust collector to an inlet of the wet smoke cleaning device. Ash treatment equipment. To 2. A discharge path of the combustion exhaust gas discharged from the incinerator main body, and incinerators side precipitator and denitrification device and a wet Araikemuri device arranged from incinerator body in order, it is discharged from the incinerator main body Ash melted through a dryer
Provide a main ash supply device to supply to the furnace and
Dry exhaust gas discharged from the machine is dusted by an exhaust gas cleaning device.
After collecting the dust, the incinerator
Dry exhaust gas that is introduced into the outlet of the body and merges with the combustion exhaust gas
An exhaust pipe is provided, the incinerator dust collector is an electrostatic precipitator, and dioxin is collected on the exhaust gas outlet side of a wet smoke washer by blowing only auxiliary agent and activated carbon into the exhaust gas at the inlet. The main ash supplied from the main ash supply device and the fly ash collected by the electrostatic precipitator are supplied to heat and melt the fly ash. An ash melting furnace and an ash melting furnace side dust collector for collecting fly ash from the molten exhaust gas discharged from the ash melting furnace are provided, and the molten exhaust gas discharged from the ash melting furnace side dust collector is subjected to the wet washing. A combined exhaust gas pipe was installed at the inlet of the smoke device, and collected by the dry filtration dust collector for collecting dioxin.
A fly ash treatment device for an incinerator, comprising a fly ash collection pipe for collecting fly ash into an ash melting furnace .