JPH10103635A - Direct connected type incineration ash melting and processing facility and its processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a melting and processing facility for dust combustion ashes and a method for processing ashes in which a high thermal efficiency is attained, a high temperature corrosion at an air preheater is prevented and concurrently dioxine or the like can be completely decomposed. SOLUTION: Thermal decomposed gas 71 of high calory generated at a dust incinerator 1 is fed into a high temperature melting chamber 2 through a discharged gas duct 17. Melting air having a high concentration of oxygen supplied from a melting air supplying means 8 to the high temperature melting chamber 2 is blown into the thermal decomposed gas 71 to perform a high temperature combustion and at the same time the high temperature heat is radiated against sludge 54 containing a large amount of residual carbon discharged from a combustion ash discharging port of the dust incinerator so as to perform a combustion of it, thereby non-ignitable material contained in the sludge 54 is melted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct connection type incineration ash melting facility for melting incineration ash discharged from a refuse incineration facility for incinerating general waste and industrial waste. About the method.

[0002]

2. Description of the Related Art Currently, there are two types of ash melting furnaces in practical use, which are classified according to a position related to an incinerator, a direct connection type directly connected to an incineration ash outlet, and a wet type discharged from the incinerator. There is a separate type that temporarily stores ash in an ash hopper or the like and then treats it.In the classification by heat source, there are an internal melting furnace using carbon in the ash as a main heat source for melting, a surface melting furnace using oil and gas, They can be broadly classified into plasma furnaces and arc furnaces using electricity as a heat source, and shaft furnaces using coke as a heat source.

Hereinafter, a direct connection type internal melting furnace whose schematic structure is shown in FIG. 5 and a separate surface melting furnace whose schematic structure is shown in FIG. 6 will be described as typical examples of the related art.

In the direct connection type surface melting furnace shown in FIG. 5, ordinary refuse b ₁ introduced from a hopper a is heated by a combustion air d ₁ heated by a combustion air preheater (not shown) in a rotary kiln c. Exhaust gas e _{1 that} is dried and burned rises to the reburning chamber f, and the incineration residue b ₂ containing incombustibles such as metal is sent over the post-combustion grate g while the combustion air d ₁ The remaining unburned matter is further dried and burned to become incinerated ash h, and falls into the melting device M.

[0005] Despite the post-combustion on the post-combustion grate g, combustibles containing about 12 to 15% of free carbon still remain in the above-mentioned incinerated ash h (30 to 30% in terms of burning loss).
60%), and this combustible component becomes an internal heat source during melting.

The incinerated ash h deposited on the hearth M ₁ made of a refractory material such as ceramics advances while being pushed out little by little by a pusher M ₂ , and burners M ₃ arranged on a ceiling portion.
, And the high-temperature melting combustion air d ₂ pumped from the lower part of the hearth described below, the above-described remaining combustibles start igniting and burning, and the temperature rises to 1200 to 1500 ° C. to melt from the surface.

The molten slag S ₁ is dropped from a dropping tube M 4 into a water-sealing conveyor j, quenched and crushed into granulated slag S ₂ , and is carried out of a field (not shown).

Here, the high-temperature exhaust gas e ₂ generated in the melting device M is sucked from the drop tube M ₄ by the exhaust gas fan k _1, and is sent to the high-temperature air heater k ₃ equipped with the melting furnace blower K ₂ . The heat is exchanged, mixed with the normal temperature air d _3, and further reduced in temperature, and then discharged to the re-combustion chamber f via the exhaust gas fan k ₁ .

The melting combustion air d ₂ is obtained by suctioning the combustion air d ₁ by a melting furnace blower k ₂ and increasing the temperature to around 500 ° C. by a high-temperature air heater k ₃ .

That is, the self-heat source in the present melting system is:
Burner M ₃ only with free carbon and ash possession heat in incineration ash h
Has been established by compensating for insufficiency heat, the heat of the exhaust gas e ₁ generated during waste combustion is not utilized.

FIG. 6 is a schematic structural view of a separate surface melting furnace according to Japanese Patent Publication No. 7-81695. Parts having the same functions as in FIG. 5 are denoted by the same reference numerals, and detailed description thereof will be omitted. .

In FIG. 6, a melting device M is surrounded by a hearth M ₁ having a stepped gradient, a furnace wall M _5, and a ceiling M ₆ , and falls into a first half preheating chamber M ₇ provided with a pusher M _2. It is composed of melter M ₈ of the second half connected to the tube M _4.

[0013] ash receiving hopper n the pusher M ₂ side of the preheating chamber M ₇ is, in the ceiling portion M ₆ is connected to the first exhaust pipe P _1, a ceiling portion M ₆ of the melting chamber M _8, burner M ₃ and the first air supply pipe q ₁ is disposed at the bottom of the drop tube M ₄ second
An exhaust gas pipe P ₂ and the second air supply pipe q ₂ is connected.

[0014] Here, is burned in incinerator not shown, ash r cold that unburnt substances does not remain so much, portionwise preheating chamber M ₇ by the pusher M ₂ from the ash receiving hopper n
It is fed within, while receiving preheating below, is transported over the hearth M ₁ that is inclined to the melting chamber M _8, the burner air supply pipe q
Is heated and melted by a burner M ₃ which receives the supply of hot air u ₃ from ₃ molten slag S _1, and the falling from the drop tube M ₄ to a water seal conveyor j.

[0015] Most of the exhaust gas generated in the melter M ₈ by heating and melting the above first exhaust gas t _1, and the in the exhaust gas by the air u ₁ of high temperature supplied from the first air supply pipe q ₁ Not causes secondarily combusting燃分, become ash r a counter flow which is transported through the preheating chamber M _7, to preheat the incineration ash r cold containing water, through the first exhaust pipe P ₁ ,
It is discharged into the hot air heater k _3.

The remaining second exhaust gas t ₂ generated from the melting chamber M ₈ is subjected to secondary combustion of unburned components in the exhaust gas by the high-temperature air u ₂ supplied from the second air supply pipe q ₂ , to prevent cooling solidification of the molten slag S _1, after which side by side with the flow of the molten slag S _1, the drop tube M ₄ lower sidewall through the second exhaust gas pipe P _2, to the same hot air heater k ₃ and the Is discharged.

On the other hand, the air sucked by the melting furnace blower k ₂ exchanges heat with the exhaust gases t ₁ , t ₂ discharged from the melting device M by the high temperature air heater k ₃ , and then the high temperature air u ₁ , u ₂ and u ₃ are supplied to various parts of the melting apparatus M.

[0018]

As described above, the direct-connection type internal melting furnace directly burns the high-temperature incineration ash discharged from the incinerator by the combustion heat of the combustible remaining in the incineration ash and the heating of the burner. It is a method of melting.

Therefore, the thermal efficiency is higher than that of the separate type,
Although there is an advantage that incombustibles can be melted in a lump, the amount of residual combustibles is not constant, and it is difficult to obtain a stable high temperature.
In addition to fuel costs are increased, in order to high-temperature exhaust gas e ₂ to flow through the vessel, inevitably hot corrosion of the hot air heater k _3. Further, since the exhaust gas e ₁ is relatively low, as dioxin is required massive exhaust gas re-combustion equipment.

On the other hand, the separate type surface melting furnace removes iron in the wet ash discharged from the incinerator, temporarily stores the finely ground ash in an ash hopper or the like, and then sets a separate melting furnace. Is a method of melting by the heat of the burner.

Although the heat efficiency is improved by preheating and drying the wet ash r by the exhaust gas t ₁ generated in the melting chamber M ₈ , a large amount of fuel is required because all the heat sources are burners M _3. not only, as in the direct-type internal melting furnace, inevitably hot corrosion of the hot air heater k _3.

Further, since the unburned carbon process generated by the combustion of dioxins and burner M ₃ in incineration ash r, the exhaust gas t ₁ and t _2, it is necessary to take measures such as returning to the incinerator body.

[0023] Furthermore, other equipment of a separate type that uses electricity or coke as a heat source, which is not illustrated, tends to not only increase the heat source cost but also require large-scale equipment.

[0024]

SUMMARY OF THE INVENTION According to the present invention, there is provided a direct connection type incineration ash melting apparatus for melting incineration ash discharged from a refuse incinerator for incinerating refuse such as general waste and industrial waste while keeping the temperature high. In a direct-connection type incineration ash melting treatment facility, a pyrolysis gas discharged from the upper part of the incinerator is introduced through an exhaust gas duct into a high-temperature melting chamber directly connected to the incineration ash discharge port of the incinerator. In addition, a molten air supply means for supplying molten air containing a large amount of oxygen to the high-temperature melting chamber is connected.

[0025] The method of the present invention for directly melting incinerated ash comprises melting the incinerated ash discharged from a refuse incinerator that incinerates refuse such as general waste and industrial waste in a high-temperature state. In the treatment method, in the refuse incinerator that is the first combustion stage, high-temperature carbonization combustion is performed in an oxygen-deficient state, and the incineration residue discharged from the bottom of the refuse incinerator and the pyrolysis gas discharged from the top of the refuse incinerator are separated. The incineration ash is melted by merging in the high-temperature melting chamber, which is the second combustion stage, and by blowing molten air containing a large amount of oxygen into the high-temperature melting chamber.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view schematically showing the entire structure of a directly-connected incineration ash melting treatment facility according to the present invention, and FIG.
It is a schematic flow figure which shows the flow of each material related to an incinerator and a high-temperature melting chamber.

In FIG. 1 and FIG. 2, reference numeral 1 denotes a vertical incinerator, which includes an incinerator main body 11 made of refractory and steel, and a refuse such as a supply feeder or a charging dumper attached to an upper portion thereof. Input hopper 13 having supply means 12
And stored in the storage chambers 14 provided below,
Garbage support plates 15, 1, which can come and go inside the incinerator body 11.
5 and an openable / closable residue discharge plate 16, 1 provided at the bottom.
6 and an exhaust gas duct 17 provided on the top and connected to the upper part of the high-temperature melting chamber 2 described below.

Reference numeral 2 denotes a high-temperature melting chamber mainly composed of a refractory, and a hearth 21 which is almost entirely inclined forward, a furnace wall 22 surrounding the hearth, a furnace ceiling 23, and a high-temperature melting chamber 2 in the high-temperature melting chamber 2. It is composed of an inlet throat portion 24 that seals high heat and a constant thickness of the ash layer, an exhaust gas introduction portion 25 to which the above-mentioned exhaust gas duct 17 is connected, and a molten air jetting means 26, and is horizontally arranged from the above-mentioned inclined portion. A V-shaped slag dropping portion 27, for example, as shown in FIG. 2, is engraved at a substantially central portion of the upper surface of the front end portion of the hearth 21 whose angle is changed.

At the entrance of the high-temperature melting chamber 2 connected to the bottom of the incinerator main body 11, a receiving section 28 for receiving the incineration residue discharged from the incinerator main body 11, and a hearth 21 for receiving the received incineration residue. A sliding type pusher 29 for transferring the upper part is provided.

Below the outlet of the high-temperature melting chamber 2 is connected a drop tube 32 of a fire-resistant structure which communicates with an air-cooled or water-cooled slag forming section 31 and has a water-cooled jacket on the lower side. At the top of the is a water or air jet
A secondary cooling means 33 is provided, and a high-temperature duct 34 having a fire-resistant structure connected to the bottom of the exhaust gas treatment equipment 4 described below branches from the middle part.

The exhaust gas treatment equipment 4 comprises a reburning chamber 43 provided with an exhaust gas mixing means 41 and a reburning air supply means 42 at the inlet, and a gas cooling chamber 45 provided with a gas cooling means 44. It is connected to a chimney via a remaining heat utilization facility including a preheater 46, a bag filter facility, an induction ventilator, and the like (not shown).

The high-temperature section of each device is kept warm by a not-shown heat insulating material or the like. Next, a melting treatment method performed by the directly-connected incineration ash melting treatment equipment configured as described above will be described.

During normal operation, as shown by the solid line, the refuse support plates 15, 15 are stored in the storage chambers 14, 14,
Since the residue discharge plates 16 and 16 are closed, garbage thrown into the loading hopper 13 from a garbage storage facility (not shown) is sequentially thrown into the incinerator main body 11 by the garbage supply means 12.

Here, the refuse and incineration residues which are already burning are deposited in the incinerator main body 11, and are supplied to the upper, middle and lower portions of the incinerator main body 11, respectively, so that the amount becomes less than the theoretical air amount. High temperature combustion air 61, 62, 6
3, high-temperature carbonization combustion (= pyrolysis) in an oxygen-deficient state.

As a result, a drying zone 51, a pyrolysis zone 52, and a residue zone 53 are formed in the incinerator main body 11 in this order from the top, although they move depending on the combustion state and the charging / discharging state. The above-mentioned garbage is thrown.

When combustion proceeds in this state and the residue area 53 expands above the installation position of the dust support plates 15, 15, the dust support plates 15, 15 which have retreated into the storage chambers 14, 14.
Is projected into the incinerator main body 11 as shown by a dashed line,
The upper layer of the residue area 53 and the thermal decomposition area 5
2 and the load of the residue in the drying zone 51 and the loaded refuse.

Subsequently, when the residue discharge plates 16, 16 are turned from the horizontal position indicated by the solid line to the vertical position indicated by the dashed line, the carbonization containing incombustibles in the residue area 53 below the waste support plates 15, 15 is performed. The residue (char) 54 is, for example, 4
It falls into the receiving part 28 in a high temperature state of 00 to 500 ° C.

Next, after returning the residue discharge plates 16 and 16 from the vertical position of the dashed line to the horizontal position of the solid line, the dust support plates 15 and 15 are moved from the projecting position of the dashed line to the storage chamber 1.
4 and 14, the upper layer of the residue area 53 and the residues and debris in the thermal decomposition area 52 and the drying area 51 which have been supported by the debris support plates 15 and 15 are discharged to the residue discharge plate. 16, fall on, and return to the above-mentioned pyrolysis state again.

Here, since the room-temperature air 64 is supplied to the storage chambers 14, 14, the dust support plates 15, 15, which are heated while projecting into the incinerator main body 11, are cooled and the dust support plates 15, 15 are cooled. While the plates 15, 15 are retracted into the storage chambers 14, 14, dust and the like generated during combustion are stored in the storage chamber 1.
4, 14 are prevented from entering.

The pyrolysis gas 7 of, for example, 700 ° C. generated by pyrolysis by the high-temperature carbonization combustion in the first combustion stage.
Reference numeral 1 denotes a high-calorie flammable gas accompanied by a large amount of unburned components, which is sucked by a draft fan (not shown), and
1 through the exhaust gas duct 17 to the exhaust gas introduction section 2
5 into the high-temperature melting chamber 2.

As shown in FIG. 2, high-temperature air 82 sucked by a blower 81 and heated by an air preheater 46 and sent from an oxygen generating means 83 are supplied to a molten air jetting means 26 installed in the exhaust gas introducing section 25. The molten air 85, which is a mixture with the oxygen 84 to be supplied, is supplied via a mixer 86, and the molten air 85 is supplied by the blower 81, the oxygen generating means 83, the mixer 86, and the damper 82v and the control valve 84v described later. A supply device (molten air supply means) 8 is configured.

When the molten air 85 is blown into the pyrolysis gas 71 in an oxygen-deficient state, the unburned portion in the pyrolysis gas 71 is ignited and burns to a high temperature. It is sprayed on the transferred residue 54.

On the other hand, the high-temperature residue 54 dropped and deposited in the receiving section 28 contains a large amount of free carbon as a result of the high-temperature carbonization combustion described above. Hearth 2 while keeping the height of the ash layer thin
1 is sequentially transferred forward on the inclined surface.

The free carbon in the residue 54 transferred onto the hearth 21 is burned by receiving the radiant heat from the high-temperature combustion of the pyrolysis gas 71 and the supply of oxygen in the molten air 85. The non-combustible material of the above-mentioned temperature rises to high-temperature incineration ash 55, and the combustion gas released by the free carbon combustion merges with the above-mentioned heated pyrolysis gas 71 to form a molten exhaust gas 72 of 1300 to 1400 ° C. It flows forward along the surface of the ash 55.

Therefore, the high-temperature incinerated ash 55 receives the internal combustion heat and the radiant heat of the molten exhaust gas 72 and starts melting its surface.
The melted portion becomes slag 56 and flows down the inclined portion of the hearth 21 to reach the horizontal portion, and the slag dropping portion 27 at the center of the horizontal portion
, And is dropped into the drop tube 32.

That is, in the high-temperature melting chamber 2, the high-temperature combustion heat by blowing oxygen to the unburned portion contained in the pyrolysis gas 71, which is a high-calorie combustible gas, and the high heat generated by the pyrolysis gas 71 By utilizing this, the free carbon in the high-temperature residue 54 in the second combustion stage is burned to generate a high-temperature molten exhaust gas 72, and the non-combustible components in the residue 54, that is, the high-temperature incinerated ash 55 is melted. .

Since the pyrolysis gas 71 introduced into the high-temperature melting chamber 2 has a high temperature as described above, the melting air 85 may be at a relatively low temperature. Therefore, the air preheater 46 serving as a heating source for the melting air is provided as described above. As described above, the air preheater 46 may be installed after the gas cooling chamber 45, and burning of the air preheater 46 due to high-temperature corrosion can be avoided.

The molten exhaust gas 72 accompanies the slag 56 from the slag dropping portion 27 to the middle of the drop tube 32 in order to prevent the slag 56 from cooling and solidifying, but is ejected from the primary cooling means 33 located above the drop tube 32. The exhaust gas 73 cooled to a certain degree by the primary cooling water 65 is guided to the exhaust gas treatment facility 4 from the high-temperature duct 34.

The slag 56 is also cooled by the primary cooling water 65 and falls to the slag forming section 31.

The exhaust gas 7 introduced into the exhaust gas treatment facility 4
3 is provided by an exhaust gas mixing means 41 provided at the inlet.
While the gas amount distribution in the reburning chamber 43 is averaged,
Inside the exhaust gas mixing means 41 and the reburning air supply means 42
The unburned portion remaining in the second combustion stage in the high-temperature melting chamber 2 is completely reburned in the reburning chamber 43 by the reburning air 66 blown into the exhaust gas 73 from the reburning air 73, and is a dioxin precursor. Although the unburned carbon particles are completely burned, they are almost completely incinerated in the high-temperature melting chamber 2, so that the reburning chamber 43 can be of a small scale.

Subsequently, the exhaust gas 73 introduced into the gas cooling chamber 45 is cooled to a desired temperature by the secondary cooling water 67 sprayed from the gas cooling means 44 and introduced into the air preheater 46 in the next step. Thereafter, the air is discharged from the chimney into the atmosphere via a bag filter facility, an induction ventilator and the like (not shown).

FIG. 3 is a system diagram showing an outline of control means for performing the incineration ash melting treatment according to the present invention, and a description of a normal control device will be omitted.

In FIG. 3, a furnace control panel 91 is provided for establishing the thermal decomposition conditions of the incinerator 1, and includes pretreatment means 92 such as a gas cooler and a gas filter.
The CO concentration in the pyrolysis gas 71 is detected by a CO concentration meter 92 having t, and the temperature of the pyrolysis gas 71 is also measured by a furnace top thermometer 93.

Accordingly, in order to maintain the upper part of the incinerator main body 11 in a reducing atmosphere, the combustion air 61, 62, 63 supplied to the drying zone 51, the pyrolysis zone 52 and the residue zone 53 of the incinerator main body 11, respectively. The supply amount is adjusted by the dampers 61v and 62
v, 63v.

As a result, the pyrolysis gas 71 contains CO or NH.
_A high-calorie combustible gas containing a large amount of unburned components such as ₃ is supplied to the high-temperature melting chamber 2.

Further, the residue 54 that falls into the receiving unit 28 is
It contains a large amount of carbonized combustibles, and the combustion air 62 supplied to the pyrolysis zone 52 and the residue zone 53 is compared with the measurement value of the residue thermometer 94 so that the combustion does not proceed in the residue zone 53. , 63 are adjusted by dampers 62v, 63v.

Next, the melting control panel 95 is a device for controlling the melting of the high temperature incineration ash 55 in the high temperature melting chamber 2 and the reburning of the exhaust gas 73 in the reburning chamber 43. The supply amount of the melted air 85 and the oxygen concentration are adjusted by the signal of the circuit for comparing the image by the ITV 96 for monitoring the slag formation state with the standard pattern and the signal of the exhaust gas thermometer 97 for detecting the temperature of the molten exhaust gas 72. The damper 82v and the control valve 84v are controlled.

At the same time, the amount of the primary cooling water 65 supplied to the primary cooling means 33 is adjusted by the control valve 65v so that the exhaust gas 73 introduced into the reburning chamber 43 is primarily cooled.
The supply amount of the reburning air 66 injected at the inlet of the reburning chamber 43 is controlled by the damper 66v.

With the above control, the stable high-calorie pyrolysis gas 71 and the molten air 85 suitable for the second combustion stage are supplied to the high-temperature melting chamber 2 and burned at a high temperature. The residue 54 can be burned at a high temperature.
Can be easily converted into slag.

In this embodiment, the waste incinerator 1 as a pyrolysis furnace has been described as a vertical type. However, a horizontal incinerator may be used, and the residue discharge plates 16 are of a damper type that can be opened and closed freely. However, as shown in FIG.
A method in which the inclined reversing grate 16b rotates around 6a may be used.

Although the receiving section 28 has been described to receive only the residue 54, a relatively small amount 57 such as ash collected from bag filter equipment or dry sludge from other facilities may be added. The additives may be supplied to the input hopper 13.

Further, the exhaust gas treatment equipment 4 may be of another type as long as it has a sufficient reburning and gas cooling function.

Also, the primary fuel injected from the primary cooling means 33
The next cooling water 65 may be performed by air.

[0065]

As described above, according to the present invention, the total amount of high-calorie pyrolysis gas containing a large amount of unburned components generated in the first combustion stage, pyrolysis, is discharged through the exhaust gas duct. It is guided to a high-temperature melting chamber, which is a two-combustion stage, in which high-temperature combustion is performed by blowing high-oxygen-concentration molten air into the pyrolysis gas by means of molten-air supply means. In this method, a large amount of free carbon in the residue similarly produced by the thermal decomposition is burned by the heat, and the gas is further heated to melt and solidify the incombustibles in the residue.

Therefore, by making effective use of the calories of the refuse and the exhaust gas, not only a special heat source for melting is not required but also a wet ash which can be seen in a separate mold for directly melting a high-temperature residue. The heat source cost can be greatly reduced without consuming extra heat for drying and heating.

Further, since the pyrolysis gas introduced into the high-temperature melting chamber is at a high temperature, the temperature of the molten air may be relatively low. Therefore, the air preheater, which is a heating source for the molten air, is provided after the gas cooling equipment. The air preheater can be prevented from being burned due to high-temperature corrosion because it is not necessary to install it in a high-temperature molten exhaust gas system as in the conventional example.

Further, since the exhaust gas in the high-temperature melting chamber is at a high temperature, and the unburned components are almost incinerated in the high-temperature melting chamber, the subsequent re-combustion chamber requires only a small volume and a large-scale furnace such as an internal melting furnace. It is not necessary to take measures such as returning to the reburning chamber or the incinerator body as a separate type.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing an overall configuration of a directly-connected incineration ash melting treatment facility according to the present invention.

FIG. 2 is a schematic flow chart showing the flow of each substance related to the incinerator and the high-temperature melting chamber.

FIG. 3 is a system diagram showing an outline of control means for performing incineration ash melting treatment according to the present invention.

FIG. 4 is a side sectional view showing another configuration of the residue discharge plate.

FIG. 5 is a schematic diagram showing a configuration of a conventional direct-connection type internal melting furnace.

FIG. 6 is a schematic diagram showing a configuration of a conventional separate surface melting furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waste incinerator 17 Exhaust gas duct 2 High-temperature melting chamber 8 Molten air supply device (Molten air supply means)

Claims (2)

[Claims] Claims: 1. A direct-connection type incineration ash melting facility for melting incineration ash discharged from a refuse incinerator for incinerating garbage such as general waste and industrial waste while maintaining a high temperature state, wherein the refuse incinerator is incinerated. The pyrolysis gas discharged from the upper part of the refuse incinerator is introduced through an exhaust gas duct into the high-temperature melting chamber directly connected to the ash discharge port, and the high-temperature melting chamber contains a large amount of oxygen-containing molten air. A directly connected incineration ash melting treatment facility, characterized in that a molten air supply means for supplying ash is connected. 2. A directly connected incineration ash melting method in which incinerated ash discharged from a refuse incinerator for incinerating garbage such as general waste and industrial waste is melted in a high temperature state, which is a first combustion stage. In the refuse incinerator, high-temperature carbonization combustion in an oxygen-deficient state is performed, and the incineration residue discharged from the bottom of the refuse incinerator and the pyrolysis gas discharged from the top of the refuse incinerator are combined into a high-temperature melting chamber in the second combustion stage. And melting the incinerated ash by injecting molten air containing a large amount of oxygen into a high-temperature melting chamber.