JPH05301085A - Device for melting and treating ash - Google Patents

Abstract

PURPOSE:To prevent environmental pollution based on disposal treatment of ash and harmful gas or the like by providing the housing part of molten ash and providing a gas circulating pipe so that one end thereof is connected to the upper end part of the ascending part of high-temperature gas and the other end is connected to the vicinity of the aperture part of a hearth part for melting ash and unburned material contained in high-temperature gas is reburned. CONSTITUTION:Ash is supplied to the aperture part of a hearth part 7 for melting ash which is opened in the lower end part of a furnace body 3. Ash is melted by a plurality of multi arc flames generated by a plurality of polyphase AC type multielectrodes 9. The hearth part 7 is formed as a circular space part so as to lower the ceiling in a horizontal shape. The ascending part 11 of high-temperature gas is provided so that the high-temperature gas is raised to the upper direction from the central part of the hearth part 7. A holding part 13 for holding melt of ash is provided in the lower direction from the central part of the hearth part 7. A gas circulating pipe 15 is provided so that one end thereof is connected to the upper end part of the ascending part 11 of high-temperature gas and the other end is connected to the vicinity of the aperture part of the hearth part 7. Thereby the unburned material contained in high-temperature gas is reburned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an ash which can be taken out as useful ceramics, special metals, etc. by melting the incineration ash or sludge which remains after incineration of various industrial wastes and is difficult to process. The present invention relates to a melt processing apparatus, and particularly to an ash melt processing apparatus that is difficult to melt and requires ultrahigh temperature processing.

[0002]

2. Description of the Related Art Conventionally, a method of sending fuel and air to burn by using an incinerator has been adopted for treating household or industrial waste, and ash remains after incineration.

[0003]

By the way, such a combustion system always requires a chimney, and smoke emitted from the chimney has a problem of air pollution. Further, if cold air is sent to the combustion from the outside, its thermal power is insufficient for incineration, and there is a possibility that incomplete combustion and harmful gases such as dioxins are generated. Since the combustion temperature is relatively low, there is no ability to effectively treat the ash produced during incineration as a ceramic component or metal component contained in the ash, and the amount of ash generated increases. There is a problem in that processing requires a great deal of labor and cost.

For this reason, the present applicant has already filed Japanese Patent Application No. 3-2.
Japanese Patent No. 88943 has applied for an apparatus for converting a plurality of arc flames generated by a multi-phase alternating current type multi-electrode into a plasma jet to melt ash, but further simplifies the configuration and rationalizes the high temperature treatment, There has been a demand for the realization of an ash melting device capable of improving its performance.

The object of the present invention is to simplify the constitution, streamline the high temperature treatment thereof, effectively treat the contained ceramic or metal components, and to dispose of the ash in order to improve the above problems. Another object of the present invention is to provide an ash melting treatment device capable of preventing environmental pollution such as harmful gas.

[0006]

In order to achieve the above object, the present invention provides a plurality of multi-phase AC type in which ash is supplied to an opening of an ash-melting furnace floor portion opened at a lower end portion of a furnace body. An ash melting treatment device for melting the ash by a plurality of multi-arc flames generated by multiple electrodes, wherein the ash melting hearth part is formed as a circular space part for lowering the ceiling horizontally, A high temperature gas rising portion in which a high temperature gas rises upward from a central portion of the melting portion, and an ash melt storage portion for storing a melt of the ash is provided downward from a central portion of the melting furnace floor portion. , A plurality of circulation gas pipes, one end of which is connected to the upper end of the high temperature gas rising portion and the other end of which is connected near the opening of the ash melting hearth part for reburning unburned substances in the high temperature gas It is an ash melting processing apparatus characterized by the above.

In the present invention, the circulating gas pipe is provided with a plurality of other multi-phase AC multi-electrodes for further increasing the temperature and speed of the high temperature gas flowing through the pipe.

In the present invention, the melting furnace floor is provided with a charging port near the ash feeding port for charging the additive.

Further, in the present invention, the furnace body is an ash preheating chamber in which preheated air is ejected from an air preheating pipe provided on the outer periphery of the high temperature gas rising portion.

[0010]

By using the ash melting treatment apparatus of the present invention, ash is supplied to the opening of the ash melting hearth portion opened at the lower end of the furnace body and generated by a plurality of multi-phase AC multi-electrodes. The ash melting hearth portion that melts the ash by a plurality of multi-arc flames is horizontally formed as a circular space portion that lowers the ceiling, and hot gas rises upward from the central portion of the melting hearth portion. A high temperature gas rising part is provided, and an ash melt containing part for containing a melt of the ash is provided below the central part of the melting hearth part, one end of which is connected to an upper end part of the high temperature gas rising part, and the other. An end is provided with a plurality of circulating gas pipes connected to the vicinity of the opening of the ash melting hearth and reburning unburned materials in the high temperature gas, and the high temperature gas flowing through the circulating gas pipes is further heated to a high speed. Multiple other multi-phase AC multi-electrodes for By providing an input port for adding additives near the input port, its structure is simplified, its high temperature treatment is rationalized, the contained ceramic or metal components are effectively treated, and the ash disposal process is performed. And environmental pollution such as harmful gas is prevented.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a front sectional view of an ash melting processing apparatus of the present invention, FIG. 2 is a plan sectional view of FIG. 1, and FIG. 3 is a perspective view of an internal main part of FIG. 1 to 3, an ash melting processing apparatus 1 mainly includes a furnace body 3, an ash storage portion 5 provided in the furnace body 3, and an ash melting hearth portion 7 provided at a lower end portion of the furnace body 3.
A plurality of multi-phase alternating-current multi-electrodes 9 provided on the peripheral portion of the ash melting hearth portion 7, a high temperature gas rising portion 11 provided above the central portion of the ash melting hearth portion 7, and It is composed of a melt containing portion 13 and a plurality of circulating gas pipes 15 provided in the lower part of the central portion.

The furnace body 3 is a hermetically sealed type made of a heat-resistant material, and a plurality of, in this embodiment, eight, ash inlets 17 capable of preventing intrusion of wind and rain and outflow of gas in the furnace are provided at the top of the furnace. The ash is continuously pushed upward by a conveyor (not shown) to be conveyed, and is accommodated in the ash accommodating portion 5 formed in the furnace body 3 through the ash charging port 17.

The ash melting hearth portion 7 is horizontally provided at the lower end portion of the furnace body 3 and is formed as a circular space portion having a low ceiling.
It is made of super heat-resistant carbon as a main component. In this embodiment, eight openings 21 are provided in the upward direction of the outer edge portion, and the ash storage portion 5 is provided.
The ash inside is sent.

Also, eight sets of three-phase AC multi-electrodes (main electrodes)
9 is arrange | positioned at the outer edge part of the ash melting hearth part 7, and radiates | emits a multi-arc flame toward the ash sent by the conveyor (illustration omitted) to the opening part 21 of the smelting hearth part 7. In this embodiment, the main electrode 9 has an outer diameter of about 50 mm and a length of 1500 mm.
The number of the carbon rod electrodes 23 is about one, and in this embodiment, one is six.
Conical shaped as a set, three-phase AC power supply (not shown)
A plurality of multi-arc flames are generated between the tips of the electrodes 23 by the supply voltage from the. The eight sets of multi-arc flames swirl inside the ash melting hearth portion 7 while stirring the ash, melting the ash, and causing the ash to flow into the melt containing portion 13 in the central portion. The dotted line portion is a preliminary electrode, and a new preliminary electrode is automatically supplied according to the consumption of the electrode 23.

Inside the conical carbon rod electrode 23 of the main electrode 9, various kinds of supply nozzles 25, 27 and 29 are formed as multiple tubes having concentric cross sections in this embodiment.
The supply nozzle 25 is an oil / fuel gas supply nozzle that ejects waste oil or fuel gas for auxiliary combustion and burns by mixing waste oil or fuel gas in a multi-arc flame.

Further, the supply nozzle 27 is a steam supply nozzle which is connected to a steam pipe and separates steam into hydrogen and oxygen by the high heat of the multi-arc flame and burns them. The supply nozzle 29 is an air supply nozzle that is connected to a preheated air pipe and ejects preheated air.

In this way, the supply nozzles 25, 27, 29
Waste oil or fuel gas, steam, and preheated air raise the temperature of the multi-arc flame of the main electrode 9 and reburn the unburned gas re-supplied by the circulating gas pipe 15 to incandescently improve its combustion efficiency. And achieve a synergistic effect.

Therefore, the ash melt is sufficiently melted in the ash melting hearth part 7 and flows down into the melt containing part 13 provided in the lower part of the central part, and at the same time, the high temperature gas generated at a high temperature is high in temperature. The inside of the gas riser 11 is raised.

The high temperature gas rising portion 11 is formed as a chimney pipe integrally provided above the central portion of the ash melting hearth portion 7. The multi-arc flame formed into a plasma jet in the ash melting hearth 7 raises the high-temperature gas generated when ash is melted.

A hot water tank 31 is mounted on the ceiling of the gas rising portion 11. The hot water warmed in the hot water tank 31 by the high-temperature gas re-lowers in the eight hot water pipes 33, flows into the steam generation tank 35 provided on the outer circumference of the ash melting furnace floor 7, and becomes steam. A part thereof is connected to a steam supply nozzle 27 via a steam pipe (not shown), and by contact with the multi-arc flame of the main electrode 9,
It is decomposed into oxygen and hydrogen and gasified to improve the combustion effect.

Further, the air supplied into the air preheating tank 37 provided on the outer periphery of the high temperature gas rising portion 11 is preheated, and a part of the air is connected to the preheating air supply nozzle 29 through a preheating air pipe (not shown). At the same time, it is connected to an ash preheating pipe 39 for injecting preheated air into the ash container 5 to preheat the ash.

In this embodiment, eight circulating gas pipes 15 are used.
Is attached to the upper end of the high temperature gas rising portion 11 in a branched manner, passes through the ash storage portion 5 in the furnace body 3, and the other end is an opening provided on the upper surface of the outer edge portion of the ash melting hearth 7. 21 is connected to the vicinity of 21, and is integrally configured with the ash melting hearth section 7 and the high temperature gas rising section 11, and the high temperature gas in the high temperature gas rising section 11 is circulated and re-supplied into the ash melting hearth section 7. Let

Further, in the circulating gas pipe 15, a plurality of multi-phase alternating current type multi-electrodes (sub-electrodes) 41 are arranged in groups of three in this embodiment. 35 mm,
A plurality of carbon rod electrodes 43, each having a length of about 1500 mm, about three in this embodiment, are formed in a conical shape with one set as a set.

The sub-electrode 41 generates a plurality of multi-arc flames between the tips of the sub-electrodes 43 by a voltage supplied from a three-phase AC power source (not shown) to further increase the heat and speed of the circulating gas. And is supplied into the ash melting hearth 7.

As with the multi-electrode 9, various supply nozzles (not shown) are formed inside the sub-electrode 41 as multi-tubes having concentric cross-sections in this embodiment to supply waste oil or fuel gas. , Supply steam, supply preheated air,
The multi-arc flame generated in the sub-electrode 41 is further heated to an ultrahigh temperature to improve the combustion efficiency.

Further, in the present embodiment, eight additive injection ports 45 are arranged in order to improve the quality of the ash melt in the vicinity of the opening 21 on the upper surface of the outer edge of the ash melting hearth 7. There is.

A hot gas shielding door 47 is attached to the inlet of the hot gas rising portion 11 from the central portion of the hearth 7. The high temperature gas shielding door 47 blocks or limits the outflow of the high temperature gas to the high temperature gas rising portion 11 to prevent the temperature of the melt in the melt containing portion 13 from decreasing, and is moved up and down by a hydraulic cylinder (not shown) or the like. It is possible, and it is completely closed when the operation is stopped to prevent the temperature from dropping.

Further, in the ash melt flowing down into the melt containing portion 13, a molten suspended substance (a lame) is produced. A filter outlet 49 is provided for letting out this filter. The other melts are separated into a ceramic having a low specific gravity and a metal having a high specific gravity, and the ceramics are taken out from the ceramic outlets 51 provided on the four sides of the side surface of the melt, and the ceramics are taken out at the bottom of the melt containing portion 13. The metal is taken out from the provided metal take-out port 53.

The metal take-out port 53 can change the take-out position depending on the specific gravity and take out a plurality of kinds of metals such as lead, copper and iron at the same time. Similarly, the outlet 49,
From the ceramic outlet 51, the paste and the ceramic can be separated and taken out.

The thus-obtained ladle, ceramic and metal can be commercialized by a mold through a suitable annealing furnace. In addition, a multi-arc flame may be further attached to each of the outlets 49, 51 and 53, and may be mixed with other materials, a catalyst, a glaze or a metal having a color, to be a product having special performance or artistry. it can.

The main ash melting processing apparatus 1 thus configured
The function of will be described.

The ash melting processing apparatus 1 of the present invention is used for 24 hours a day (24
1 hour to melt and process about 100 tons of ash
Eight main electrodes 9 each having an output of about 500 KVA and a plurality of auxiliary electrodes 41 each having an output of about 300 KVA are mounted, and a multi-arc flame generated from the three-phase AC multi-electrodes 9, 41 is installed. Is heated by waste oil or fuel gas, water (steam), and air from the central portion of the multi-electrodes 9, 41 together with the stirring action by the rotating magnetic field action by the three-phase alternating current, and the ash is melted and stirred to flow. Intense, high speed, high temperature plasma jet flamed ultra high temperature energy.

Therefore, the unburned components of the high-temperature gas are completely burned, and the content of harmful components is much smaller than that of the exhaust gas from the conventional combustion furnace. The extracted ceramic is harmless and has high heat resistance and heat insulating property because its crystal particles are made uniform by the high-speed stirring action of the plasma-jetted multi-arc flame, and the metal (alloy) is also a beautiful and useful new material. It can be used.

The thermal energy of the high temperature gas generated by the jetted multi-arc flame in the circulating gas pipe 15 is
It can also be effectively used as a power source or power source for high temperature gas turbine power generation, steam turbine power generation, hot water flow power generation, or CFC power generation using CFC gas, which is not shown.

The present invention is not limited to the above-mentioned embodiments, but can be carried out in other modes by making appropriate design changes. For example, only incinerated ash of industrial waste is used. Without being limited thereto, it can be applied to incinerating other materials such as hedoro or refining ore or the like.

Further, if the furnace is hermetically sealed at the treated material inlet, the harmful pollutants can be safely treated. For example, a substance containing harmful gas such as a PCB-containing substance, a power supply container or the like, or an FRP tire may be melted.

The ash melting furnace of the present invention is pyrolyzed and gasified by the high temperature of the multi-arc jet flame, which is different from the usual combustion principle, in the state without air insertion and chimney. When combustible waste (including food waste) is added to, it can be gasified and taken out as fuel gas.

Also, tire rubber, plastic, wood,
Since paper and so on are carbon (soot), collect carbon with an appropriate filter, exhaust device, and other equipment.
It can also be commercialized.

At this time, tires or plastics are heavily dipped in the melt containing portion at the bottom of the furnace and are thermally decomposed at a high temperature of the melt so that a part becomes combustible gas, a part becomes carbon, and a part circulates. It becomes gas or exhaust gas.

Further, by utilizing the high heat flow of this circulating gas, power can be generated from the gas turbine using high temperature to energy using steam turbine, hot water drop, etc., and finally low temperature CFC gas power generation. it can. Power is generated by using a jet flow of an auxiliary multi-arc flame in a circulation gas passage (not shown). The number of these multi-arc electrodes is preferably about 3 to 6.

The quantity and arrangement of the main electrode 9 and the auxiliary electrode 41 are not limited to those in this embodiment, and the arrangement of the oil / fuel gas supply nozzle 25, the water vapor supply nozzle 27, and the air supply nozzle 29 is also in this embodiment. It is not limited.

[0043]

As is apparent from the above description, the ash melting processing apparatus of the present invention supplies ash to the opening of the ash melting hearth portion opened at the lower end of the furnace body, The ash melting hearth part for melting the ash by a plurality of multi-arc flames generated by a multi-phase AC multi-electrode is formed as a circular space part for lowering the ceiling horizontally, and the central part of the melting hearth part A high temperature gas rising part for rising the high temperature gas upward is provided, and an ash melt containing part for containing the ash melt is provided below the central part of the melting hearth part, and one end of the high temperature gas rising part is provided. A plurality of circulation gas pipes connected to the upper end of the above-mentioned part and the other end connected to the vicinity of the opening of the ash melting hearth part to recombust unburned materials in the high temperature gas, and to flow into the circulation gas pipes. Other multi-phase alternating current type multi-electricity that further increases the temperature and speed of the hot gas By providing an inlet in the melting hearth near the ash inlet, the problems of the prior art can be effectively solved, its configuration simplified, and its high-temperature treatment streamlined. The contained ceramic component or metal component is effectively treated, and ash disposal and environmental pollution due to harmful gas are prevented.

[Brief description of drawings]

FIG. 1 is a front sectional view of an ash melting processing apparatus of the present invention.

FIG. 2 is a plan sectional view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ash melting treatment apparatus 5 Ash storage part 7 Melting hearth part 9 Main electrode 11 High temperature gas rising part 13 Ash melt storage part 25 Waste oil, fuel gas supply nozzle 27 Steam supply nozzle 29 Preheat air supply nozzle 41 Sub-electrode 45 Additive Inlet 47 Hot gas shield door

Claims (4)

[Claims] 1. Ash is supplied to an opening portion of an ash melting hearth portion opened at a lower end portion of a furnace body, and the ash is melted by a plurality of multi-arc flames generated by a plurality of multi-phase AC multi-electrodes. An ash melting treatment apparatus, wherein the ash melting hearth part is formed as a circular space part for lowering the ceiling horizontally, and the high temperature gas rises in which the hot gas rises upward from the central part of the melting hearth part. Is provided, and an ash melt containing portion for containing the melt of the ash is provided below the central portion of the melting furnace floor, one end of which is connected to the upper end of the hot gas rising portion, and the other. An ash melting treatment apparatus, characterized in that a plurality of circulating gas pipes are provided, the ends of which are connected to the vicinity of the opening of the ash melting hearth and reburn the unburned materials in the high temperature gas. 2. The ash-melting apparatus according to claim 1, wherein the circulating gas pipe is provided with a plurality of other multi-phase AC multi-electrodes for further increasing the temperature and speed of the high temperature gas flowing in the pipe. Processing equipment. 3. The melting furnace floor portion according to claim 1,
An ash melting treatment apparatus characterized in that a charging port for charging an additive is provided near the ash feeding port. 4. The ash melting process according to claim 1, wherein the furnace body is an ash preheating chamber in which preheated air is jetted from an air preheating tube provided on the outer periphery of the high temperature gas rising portion. apparatus.