JP2014190598A - Mixture gas blowing device, waste gasification melting furnace with the same, mixture gas blowing method, and waste gasification melting method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide mixture gas blowing device and method for sufficiently mixing fuel gas with oxygen-containing gas and blowing it to a tuyere, and waste gasification melting device and method using the same.SOLUTION: In a mixture gas blowing device 20, mixture gas obtained by mixing oxygen-containing gas and fuel gas is blown to a coke floor of a waste gasification melting furnace 1 for thermally decomposing a waste in a furnace body having a coke floor and melting a residue from a tuyere 5 provided on the furnace body of the waste gasification melting furnace. The mixture gas blowing device 20 has an air supply pipe 22 connected to the tuyere 5 and supplying the mixture gas into the furnace body, and the air supply pipe 22 has a double pipe structure having an outer pipe 26 and an inner pipe 27. Oxygen-containing gas is supplied to the outer pipe 26 and fuel gas is supplied to the inner pipe 27. A flow velocity of the oxygen-containing gas is larger than that of the fuel gas.

Description

  The present invention relates to a mixed gas blowing apparatus, a waste gasification melting furnace having the same, a mixed gas blowing method, and a mixed gas blowing method for a waste gasification and melting furnace for thermally decomposing and burning waste and melting a pyrolysis residue. The present invention relates to a waste gasification and melting method using the above.

  As a technology for treating waste such as municipal waste and shredder dust, waste melting treatment is known in which waste is pyrolyzed and burned to melt the pyrolysis residue into slag and discharge it.

  This treatment method can recover the heat of combustion by pyrolyzing and gasifying waste, and it should be disposed of in landfills after melting the pyrolysis residue and discharging it as slag. It has the advantage that the volume can be reduced. There are several methods for such melting treatment, and one of them is a method using a shaft furnace type waste gasification melting furnace having a vertical shape.

  This shaft furnace type waste gasification melting furnace, for example, burns coke deposited in the lower part of the furnace, throws the waste on this high temperature coke, pyrolyzes and partially oxidizes it, and gasifies it as residue Is a furnace that performs a process of melting slag into slag (see Patent Document 1).

  In the shaft furnace type waste gasification and melting furnace of Patent Document 1, the functions of a vertical cylindrical furnace body are roughly divided into three regions in the vertical (up and down) direction. That is, a high-temperature combustion zone having a coke bed with coke deposited at the lower part of the furnace is formed, a waste layer is formed on the high-temperature combustion zone, and a large space above the waste layer at the upper part of the furnace body. The free board part is made.

  In such a gasification melting furnace, oxygen-containing gas is blown into the furnace in each of the three regions. A main tuyere is provided in the high-temperature combustion zone at the bottom of the furnace, and oxygen is enriched to obtain a melting heat source that burns the coke of the coke bed deposited and deposited to melt the pyrolysis residue of waste Air is blown. In addition, the waste layer is provided with a sub tuyere, and air is blown in order to gently flow the waste deposited and deposited, and to thermally decompose and partially oxidize the waste. In addition, the free board part is provided with a third stage tuyere to partially burn part of the pyrolysis gas (combustible gas) generated by pyrolyzing waste and maintaining the inside at a predetermined temperature Air is blown.

  As described above, the shaft furnace type waste gasification and melting furnace is a facility capable of performing both pyrolysis gasification treatment and melting treatment in one furnace as the waste falls in the furnace. The input waste is pyrolyzed to produce gas and residue. The coke in the coke floor is combusted by blowing oxygen-enriched air from the main tuyere to form a high-temperature combustion zone, and the pyrolysis residue of the waste is melted and discharged as slag and metal. The coke floor is a gap created between cokes, and it functions as a high-temperature grate that allows oxygen-enriched air from the main tuyere and high-temperature gas generated by coke combustion to flow, and also allows molten slag and metal to flow. ing. The high-temperature gas generated by coke combustion in the high-temperature combustion zone heats the waste in the waste layer formed on the high-temperature combustion zone, and the waste is thermally decomposed by blowing air from the sub tuyere. The gas containing the combustible gas generated by the gas rises in the waste layer, and is discharged to the secondary combustion chamber outside the furnace from the exhaust flue provided in the upper part of the furnace through the free board part. The gas contains a large amount of combustible gas and is combusted in the secondary combustion chamber, and heat is recovered by the boiler to generate steam, which is used for power generation and the like. Exhaust gas treatment, such as removing relatively coarse dust with a cyclone, cooling with a temperature reducing device, removing harmful gas by reaction with a hazardous substance remover, and removing dust with a dust collector And then released from the chimney to the atmosphere.

  In such a waste gasification melting furnace, a coke bed in which coke is deposited at the bottom of the furnace is formed, and the coke burns to become a heat source for melting pyrolysis residues. There is a demand for reducing carbon dioxide emissions by reducing the amount used.

  Therefore, it has been studied to use fuel gas such as LNG, LPG, and combustible gas generated by thermal decomposition in a waste gasification and melting furnace as an alternative to coal coke. It has been proposed to blow fuel gas together with oxygen-enriched air from the mouth (fan tuyere).

  In Patent Document 2, the tip (opening) of the main tuyere (blower tuyere) that feeds oxygen-enriched air into the furnace enters the furnace and enters the coke floor to be positioned. A main tuyere is provided. The fuel gas is supplied into the main tuyere at the tip position of the tuyere and blown out from the tip of the main tuyere with oxygen-enriched air. Therefore, the fuel gas blown out from the tip of the main tuyere and the oxygen-enriched air are not mixed in the main tuyere but mixed between the coke grains in the coke bed after being blown into the coke bed. .

JP 09-060830 A JP 2001-090923 A

  In order to reduce carbon dioxide emissions, even if fuel gas is blown in as a substitute for a part of coke as in Patent Document 2 in order to reduce the amount of coke used in a waste gasification and melting furnace, the following problems occur: There is. That is, in Patent Document 2, the tip of the main tuyere where the fuel gas and oxygen-enriched air are blown out is located in the coke floor and faces the coke deposit layer. The gas cannot be mixed with oxygen-enriched air and burned efficiently. In other words, the space for mixing oxygen-enriched air and fuel gas from the main tuyere into the melting furnace is blocked by unmelted slag or low-temperature coke in the coke bed and is not formed. Therefore, there is a problem that stable combustion may not be performed in a sufficiently mixed state in the coke bed.

  In addition, in order to melt the dust discharged and recovered from the waste gasification melting furnace and to blow it into the coke floor from the main tuyere, Patent Document 2 discloses oxygen enrichment. An appropriate mechanism for blowing air, dust and fuel gas is not disclosed, and there is a problem also in this respect.

  In view of such circumstances, the present invention provides a mixed gas blowing apparatus and method for thoroughly mixing fuel gas and oxygen-containing gas and blowing them into the tuyere, and a waste gasification and melting apparatus and method using the mixed gas blowing apparatus and method. This is the issue.

  According to the present invention, the above-described problems can be solved by configuring the apparatus and method as follows. As a device for injecting a mixed gas into a waste melting furnace for combustion, a mixed gas blowing device and a waste gasification melting furnace having the mixed gas, and further as a method, a mixed gas blowing method and a waste gasification melting using the same The method is configured as follows.

<Mixed gas blowing device>
The mixed gas blowing apparatus according to the present invention is a mixed gas in which an oxygen-containing gas and a fuel gas are mixed into a coke bed of a waste gasification melting furnace that thermally decomposes waste in a furnace having a coke bed and melts the residue. Are blown from the tuyere provided in the furnace body of the waste gasification melting furnace.

  In such a mixed gas blowing device, in the present invention, it has an air supply pipe that is connected to the tuyere and sends the mixed gas into the furnace body, and the air supply pipe has a double tube structure having an outer tube and an inner tube. The oxygen-containing gas is supplied to the outer tube and the fuel gas is supplied to the inner tube, and the flow rate of the oxygen-containing gas is larger than the flow rate of the fuel gas.

<Waste gasification melting furnace>
The waste gasification and melting furnace is configured by including the above-described mixed gas blowing apparatus of the present invention.

<Mixed gas injection method>
The mixed gas blowing apparatus according to the present invention is a mixed gas in which an oxygen-containing gas and a fuel gas are mixed into a coke bed of a waste gasification melting furnace that thermally decomposes waste in a furnace having a coke bed and melts the residue. Are blown from the tuyere provided in the furnace body of the waste gasification melting furnace.

  In this mixed gas blowing method, in the present invention, an air supply pipe connected to the tuyere and sending the mixed gas into the furnace body is connected, and the air supply pipe has a double tube structure having an outer tube and an inner tube. The oxygen-containing gas is supplied to the outer tube, and the fuel gas is supplied to the inner tube so that the flow rate of the oxygen-containing gas is higher than the flow rate of the fuel gas.

<Waste gasification and melting method>
In the present invention, the waste gasification and melting method is configured to inject a mixed gas into the melting furnace by the above-described mixed gas blowing method, and to the coke bed of the waste gasification and melting furnace by the above-described mixed gas blowing method. It is characterized in that a mixed gas is blown into the furnace body and the waste is pyrolyzed to melt the residue.

  According to such a mixed gas blowing apparatus and method, and a waste gasification melting furnace and melting method, the flow rate of the oxygen-containing gas supplied to the outer pipe of the air feeding pipe having a double pipe structure is supplied to the inner pipe. As a result, the flow of the oxygen-containing gas blown out from the outer tube and the flow of the fuel gas blown out from the inner tube are disturbed due to the difference between the flow rates of the two. And fuel gas mixing is promoted. As a result, the mixed gas is sufficiently mixed before reaching the furnace, so that the fuel gas in the mixed gas burns well in the coke bed in the furnace.

  In the present invention, as described above, the flow rate of the oxygen-containing gas supplied to the outer pipe of the air supply pipe having the double pipe structure is larger than the flow speed of the fuel gas supplied to the inner pipe. Due to the difference in flow velocity, the flow of the oxygen-containing gas blown out from the outer tube and the fuel gas blown out from the inner tube are disturbed, and the mixing of the oxygen-containing gas and the fuel gas is promoted. As a result, the mixed gas is sufficiently mixed before reaching the furnace, so that the fuel gas in the mixed gas burns well in the coke bed in the furnace. In this way, it is possible to efficiently use the fuel gas as a substitute for a part of coke and use the combustion heat as a melting heat source, so the amount of coke used can be reduced and the amount of carbon dioxide emissions can be reduced.

It is a figure which shows schematic structure of the waste gasification melting apparatus as one Embodiment of this invention. It is an expanded sectional view about the main tuyere in the FIG. 1 apparatus. FIG. 3 is a cross-sectional view of the main part of the mixed gas blowing device connected to the main tuyere of FIG. 2 and including the axis of the air supply pipe.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the present embodiment, coke and fuel gas are supplied as fuel to the shaft furnace type waste gasification and melting furnace, the waste is thermally decomposed in the furnace, and the oxygen-containing gas, fuel gas, In addition, it is characterized by having a mixed gas blowing device for blowing a mixed gas mixed with the dust discharged and recovered from the waste gasification melting furnace from the tuyere. Prior to explanation of these features, FIG. First, the general configuration of this shaft furnace type waste gasification melting furnace will be described.

  A shaft furnace type waste gasification and melting furnace employed in an embodiment of the present invention shown in FIG. 1 includes waste as a processing object and coke as fuel in the upper part of the gasification and melting furnace 1. An inlet 2 for introducing limestone as a slag component adjusting material into the furnace is provided, and a gas outlet 3 for exhausting the gas in the furnace to the outside of the furnace is provided on the upper side. ing. In addition, an outlet 4 for discharging molten slag and molten metal is provided at the bottom of the gasification melting furnace 1.

In the shaft furnace type waste gasification and melting furnace, the internal space of the gasification and melting furnace 1 is roughly divided into three regions in the vertical direction. This is a region having a middle shaft portion II located at the top and a free board portion III formed at the top. Each of these parts I, II, and III is an area having the following functions. That is, the lower shaft portion I forms a coke floor with the deposited coke and burns the coke to form a high-temperature combustion zone, and the middle shaft portion II is a waste of the waste put on the high-temperature combustion zone. A region where the waste of the waste layer formed by deposition is thermally decomposed, the free board part III, is a region where the generated combustible gas is partially combusted.

  Above the waste gasification and melting furnace 1, a supply device (not shown) for supplying waste such as municipal waste, coke, and limestone used as a component adjusting material for slag to be generated is disposed. Waste, coke, and limestone supplied from this supply device are transported by a transport conveyor (not shown) and charged into the furnace through the charging port 2 at the top of the furnace.

  A tuyere for blowing oxygen-containing gas is provided on the furnace wall for each of the lower shaft portion I, the middle shaft portion II, and the freeboard portion III formed in the waste gasification melting furnace. That is, the lower shaft portion I is provided with a main tuyere 5 that burns the deposited coke to form a high-temperature combustion zone and blows a gas mixture for melting the pyrolysis residue, and the middle shaft portion II In addition, a sub tuyere 6 is provided to blow in air for causing thermal decomposition and combustion while causing the waste deposited and deposited to partially burn and slowly flow the waste. A three-stage tuyere 7 for blowing air for partially burning the combustible gas generated by pyrolysis and maintaining the inside of the furnace at a predetermined temperature is provided.

  A secondary combustion chamber 10 is connected to the gas discharge port 3 and burns combustible gas generated by pyrolyzing waste. An air blowing port 11 for blowing air for secondary combustion is provided. Further, the secondary combustion chamber 10 is provided with a boiler 12 adjacent to which heat is recovered from the combustion gas obtained by burning the combustible gas in the secondary combustion chamber 10.

  Exhaust gas from the boiler 12 is exhausted through an exhaust pipe 13 and is detoxified through a temperature reducing device, a dust collector, and an exhaust gas treatment device (both not shown) provided on the downstream side. To be released.

  Dust contained in the exhaust gas and falling in the secondary combustion chamber 10 and the boiler 12 is discharged from the secondary combustion chamber 10 and the boiler 12, and together with the dust collected by the dust collector, passes through the dust return path 15. After being brought to the dust storage tank 16 provided at the upper side position of the gasification melting furnace 1, it is attached to the main tuyere 5 through a rotary valve 16 A provided at the lower outlet of the dust storage tank 16. Further, it is connected to a dust supply pipe 23 described later provided in an air supply pipe 22 described later, so that dust is fed back to the furnace. This supply of dust to the main tuyere 5 will be described later again.

  The main tuyere 5 provided in the lower part of the furnace wall 1A of the gasification melting furnace 1 has a conical outer peripheral surface attached to a stepped taper through hole 1B formed in the furnace wall 1A as seen in FIG. It has a base-like holding body 18 having The holding body 18 holds a tip attachment portion 21 attached to the tip of an air supply tube 22 of the mixed gas blowing device 20 described below.

  The tip mounting portion 21 has an outer diameter surface 21A tapered and a cylindrical through hole 21B. A wear-resistant material layer 21C is provided on the inner diameter surface of the through hole 21B. The through hole 21B has a locking portion 21B-1 having a large inner diameter in a step shape on the large outer diameter end side. The holding body 18 that holds the tip mounting portion 21 has a conical bowl shape as described above, and a holding hole 18A is formed at the bottom (right end in the drawing). The holding hole 18A forms a tapered hole that matches the large-diameter end portion of the outer diameter surface of the tip mounting portion 21, and the tapered hole comes into contact with the outer diameter surface of the tip mounting portion 21 to attach the tip mounting portion. The part 21 is held. As described above, the tip mounting portion 21 held by the holding body 18 is held by the holding body 18 attached to the furnace wall 1A of the furnace body, and the tip of the tip mounting portion 21 has a small outer diameter end side tip. Located in the furnace. At least the holding body 18 of the holding body 18 and the tip mounting portion 21 is water-cooled, but since its type is known, the description of the form for water cooling is omitted here.

  As shown in FIG. 3, the mixed gas blowing device 20 having the air supply tube 22 provided with the tip attachment portion 21 at the tip has a double tube structure in which an inner tube 27 is disposed concentrically within the outer tube 26. The tip opening of the inner tube 27 is located on the left side (upstream side) before the tip opening of the outer tube 26. The outer pipe 26 is supplied with oxygen-enriched air (for example, an oxygen concentration of 45 to 55%) as an oxygen-containing gas obtained by mixing oxygen into the air and flows downstream. On the other hand, in the inner pipe 27, a fuel gas such as LNG flows downstream.

  The outer tube 26 has a branch port formed at one position in the circumferential direction at the upper surface position of the outer tube 26, and the branch port is used as a dust supply port 23A. A dust supply pipe 23 that forms part of the dust return path 15 and supplies dust to the air supply pipe 22 is connected to the dust supply port 23A.

  Since dust is supplied to the outer tube 26 from the dust supply port 23A, the inner wall surface of the outer tube is provided with the dust supply so that the inner wall of the tube is not damaged by wear or the like due to dust flowing toward the downstream side. A wear-resistant material layer 26A coated with a wear-resistant material is provided in the downstream range from the position of the opening 23A. The wear-resistant material layer 26 </ b> A extends to the downstream end of the outer tube 26, and the wear-resistant material layer 21 </ b> C is formed on the inner diameter surface of the conical tip mounting portion 21 attached to the distal end of the outer tube 26. It is continuous (see FIG. 2). Such wear-resistant material layers 21C and 26A can be formed of, for example, ceramic or wear-resistant clad steel. As the ceramic, for example, at least one of silicon nitride, zirconia, and alumina is used. The wear-resistant material layer can be formed by coating the inner diameter surface of each tube, or can be formed by inserting a sleeve having a thickness of about 10 mm of the wear-resistant material into each tube. In particular, in the case of wear-resistant clad steel, the entire tube may be made of the wear-resistant clad steel. When the wear resistant material sleeve is used, the wear resistant material sleeve can be fixed to the inner diameter surface of the tube by mortar or the like in the outer tube 26.

In the present embodiment, the oxygen-enriched air and the fuel gas are respectively supplied so that the flow velocity V ₁ of the oxygen-enriched air flowing through the outer tube 26 is larger than the flow velocity V _{2 of the} fuel gas flowing through the inner tube 27. Yes. The ratio of the flow velocity _{V 2} of the oxygen-enriched air velocity _{V 1} and the fuel gas _(V 1 / _{V 2),} it is preferable that a 1.7 to 6.2. For example, the flow velocity _{V 1} of the oxygen-enriched air 40~124m / sec, the flow velocity _{V 2} of the fuel gas is set to 20~23m / sec.

  In the present embodiment, since the flow velocity difference is provided between the oxygen-enriched air and the fuel gas in this way, the tip region in the outer tube 26, that is, the axial direction of the air feeding tube 22, the outer end from the tip opening of the inner tube 27 Disturbances occur in the flow of oxygen-enriched air and dust in the outer tube 26 and the fuel gas blown out from the inner tube 27 in the space formed in the range up to the tip opening of the tube 26. Therefore, oxygen-enriched air, dust, and fuel gas are sufficiently mixed in the distal end region of the outer tube 26 to form a mixed gas. This mixed gas is blown into the furnace from the tip of the through hole 21B (see FIG. 2) of the tip mounting portion 21.

  The tip attachment portion 21 attached to the tip of the air supply pipe 22 has a tip opening in the furnace and faces the coke bed in the high temperature combustion zone. Even though it can circulate between the grains, it will receive a large ventilation resistance from the coke grains, and it is not in a situation where mixing can be sufficiently performed in the furnace. In this respect, in this embodiment, since the mixed gas is formed in the tip region in the outer tube 26 before being blown into the furnace, there is nothing that hinders gas mixing, and the mixed gas Is blown from the main tuyere 5 into the coke floor in the furnace in a sufficiently mixed state up to the main tuyere 5. Therefore, the fuel gas burns well in the coke bed.

  In the present embodiment configured as described above, the waste gasification and melting treatment is performed as follows.

  Waste, coke, and limestone from the supply device are respectively introduced into the furnace by a predetermined amount through the inlet 2 provided in the upper portion of the gasification melting furnace 1, and main tuyere 5, sub tuyere 6, and three From the stage tuyere 7, oxygen-enriched air or air is blown into the furnace. In particular, from the main tuyere 5, as described above, the mixed gas obtained by mixing the oxygen-enriched air, fuel gas, and dust generated in the air supply pipe 22 of the gas mixture blowing apparatus 20 in the air supply pipe 22. Is blown into the furnace. The waste introduced from the inlet 2 is deposited on the middle shaft part II in the furnace to form a waste layer, and from the high temperature gas and sub tuyere rising from the high temperature combustion zone of the lower shaft part I. It is dried by blown air and then partially burned and pyrolyzed. The combustible gas generated by pyrolysis is partly combusted by the air blown from the three-stage tuyere 7 in the free board part III, and the free board part III is kept in a high-temperature reducing atmosphere of 850 ° C. or higher. A process for decomposing toxic gas and tar content is performed, and a gas containing a combustible gas is sent to a secondary combustion chamber 10 provided outside the furnace and subjected to secondary combustion, and heat is recovered from the combustion gas in a boiler 12. .

  The coke descends to the lower shaft portion I to form a high temperature combustion zone (coke bed). The residue resulting from the thermal decomposition of the waste in the waste layer descends and reaches the coke floor of the lower shaft portion I. Pyrolysis residue (ash content, incombustible material) is heated by the combustion of coke and fuel gas in the coke bed and melts into molten slag and molten metal. The molten slag and molten metal are discharged from the tap 4 and supplied to a water granulating device provided outside the furnace, cooled and solidified, and the cooled and solidified granulated slag and granulated metal are recovered. On the other hand, when the dust in the mixed gas blown from the main tuyere reaches the high temperature combustion zone from the main tuyere 5, it is melted and extracted from the outlet 4 at the bottom of the furnace together with the molten pyrolysis residue. In this way, the volume of the landfill is reduced by melting the dust, thereby greatly reducing the amount of landfill disposal.

  In the present embodiment, the oxygen-enriched air and dust in the outer tube 26 are blown into the furnace in a state of being mixed with oxygen in the inner tube 27 in the distal end region of the outer tube 26. Therefore, the fuel gas is in a mixed gas state that is sufficiently mixed with oxygen-enriched air and dust before being blown out from the tuyere into the furnace, and the fuel gas is burned well in the coke bed. In this way, it is possible to efficiently use the fuel gas as a substitute for a part of coke and use the combustion heat as a melting heat source, so the amount of coke used can be reduced and the amount of carbon dioxide emissions can be reduced.

  In the present invention, the mixed gas blowing device 20 is not limited to the form shown in FIG. 3, and various modifications are possible. For example, air may be used as the oxygen-containing gas instead of oxygen-enriched air. In addition, it is not essential to supply dust to the air supply pipe. When dust is not supplied, facilities such as a dust storage tank and a wear-resistant material layer on the inner wall surface of the outer pipe are not necessary.

  In the embodiment of FIG. 3, the distal end opening of the inner tube 27 is positioned upstream of the distal end opening of the outer tube 26. Instead, the inner tube 27, the distal end opening, and the outer tube 26 are replaced. The tip opening may be at the same position in the axial direction of the air supply tube 22. In such a form, the oxygen-enriched air and dust blown out from the outer tube 26 and the fuel gas blown out from the inner tube 27 are mixed in the tip mounting portion 21.

DESCRIPTION OF SYMBOLS 1 Waste gasification melting furnace 5 (Main) tuyere 20 Mixed gas blowing apparatus 22 Air supply pipe 23A Dust supply port 26 Outer pipe 27 Inner pipe

Claims (4)

A mixed gas of oxygen-containing gas and fuel gas is mixed into the coke bed of a waste gasification and melting furnace that pyrolyzes waste and melts the residue in a furnace having a coke bed. In the mixed gas blowing device that blows from the tuyere provided in the furnace body,
It has an air supply pipe connected to the tuyere to send the mixed gas into the furnace, and the air supply pipe has a double pipe structure having an outer pipe and an inner pipe, and an oxygen-containing gas is supplied to the outer pipe. And the fuel gas is supplied to the said inner pipe, The mixed gas blowing apparatus characterized by the flow velocity of oxygen-containing gas being larger than the flow velocity of fuel gas.   A waste gasification melting furnace comprising the mixed gas blowing device according to claim 1. A mixed gas of oxygen-containing gas and fuel gas is mixed into the coke bed of a waste gasification and melting furnace that pyrolyzes waste and melts the residue in a furnace having a coke bed. In the mixed gas blowing method for blowing from the tuyere provided in the furnace body,
An air supply pipe connected to the tuyere and sending the mixed gas into the furnace is connected, and the air supply pipe has a double pipe structure having an outer pipe and an inner pipe, and the outer pipe contains oxygen. A method of injecting a gas and supplying a fuel gas to the inner pipe so that a flow rate of an oxygen-containing gas is larger than a flow rate of the fuel gas.   Waste gasification characterized in that the mixed gas is blown into the furnace body toward the coke floor of the waste gasification melting furnace by the mixed gas blowing method according to claim 3 to thermally decompose the waste and melt the residue. Melting method.

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