JP2006097918A - Combustion furnace and waste treatment facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion furnace and waste treatment facility of a waste gasification melting treatment facility capable of burning while preventing attachment of a melting slug on an inner wall surface of a combustion chamber even in introducing produced gas produced by pyrolyzing waste together with scattered material. <P>SOLUTION: The combustion furnace is provided with the combustion chamber, a susceptible gas supplying means 31 for supplying susceptible gas in the combustion chamber so as to form a swirling flow, and an exhaust port of combustion gas communicating with the combustion chamber, and is further provided with a flammable gas supplying means 28 for supplying flammable gas to the combustion chamber between the susceptible gas supplying means and the exhaust port. An axis of the flammable gas supplying means is coaxial with the combustion chamber and is in contact with a virtual circle of a smaller diameter than an internal diameter of the combustion chamber. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to the treatment of waste such as municipal waste and waste plastic, and more particularly to a combustion furnace that burns a gas containing a combustible component generated when the waste is thermally decomposed or burned.
The present invention relates to the treatment of waste such as municipal waste and waste plastic, and more particularly, to a waste treatment facility including the combustion furnace that generates a molten slag and combustion exhaust gas by thermally decomposing or treating the waste.

  The production concentration of dioxins in incinerators when burning municipal waste, industrial waste, etc. has a strong positive correlation with the concentration of carbon monoxide in waste combustion exhaust gas, and the concentration of carbon monoxide in waste combustion exhaust gas is It is estimated that the concentration of dioxins increases as the size increases. The carbon monoxide concentration of waste combustion exhaust gas is also used as an indicator of dioxin generation in the guidelines for prevention of dioxin generation, etc., announced in December 1990 by the Environment Development Division, Ministry of Health and Welfare.

  Conventionally, a solid-type two-stage combustion furnace has been used as a combustion furnace for municipal waste, industrial waste, etc., particularly as a small-sized combustion furnace. However, in a conventional solid-type two-stage combustion furnace, exhaust gas is generated in a secondary combustion chamber. A portion of unburned gas containing carbon monoxide, hydrocarbons and the like was discharged out of the system without being completely burned. That is, there has been a problem that a sufficient effect cannot be obtained with respect to the reduction of hardly decomposable organochlorine compounds such as dioxins.

  As a two-stage combustion furnace for solving this problem, there is a waste pyrolysis melting system proposed in Patent Document 1, for example. This has a primary combustion chamber having an arbitrary shape, a substantially cylindrical secondary combustion chamber, and an exhaust gas introduction path for introducing exhaust gas from the primary combustion chamber to the secondary combustion chamber. Is a combustion treatment device that is introduced in a tangential direction to generate a swirling flow in the secondary combustion chamber. The swirling flow efficiently achieves mixing of air and exhaust gas containing unburned components, and completely burns unburned components into carbon dioxide. Furthermore, it is possible to decompose a hardly decomposable organochlorine compound such as dioxins to the limit.

  Patent Documents 2 to 4 disclose waste treatment technologies that form a swirl flow in a combustion chamber as in the combustion treatment apparatus of Patent Document 1 and promote the combustion of unburned gas using the mixing action.

  Patent Document 2 discloses a waste pyrolysis melting system including a waste pyrolysis melting furnace configured as a vertical furnace, and a cylindrical combustion chamber for high-temperature combustion of a generated gas from the waste pyrolysis melting furnace. Has been. The feature of this system is that the generated gas is swirled along the inner surface of the peripheral wall of the combustion chamber, and the scattered matter accompanying the generated gas adheres to the inner surface of the peripheral wall of the combustion chamber by the heat of swirl combustion. It is in the point which is made to melt | dissolve in the state and flowed down a wall surface and collect | recovered as molten slag. As a result, sludge, shredder dust, liquid waste, and the like, which have been difficult to treat in the conventional pyrolysis melting furnace, can be supplied to the combustion chamber and recovered as molten slag. Further, since entrainment of scattered matter from the outlet of the combustion chamber to the downstream side is greatly reduced, even if a waste heat boiler is provided in the subsequent exhaust gas path, there is no risk of reducing its efficiency.

  Patent Document 3 discloses a gasification melting furnace facility similar to the waste pyrolysis melting system disclosed in Patent Document 2. The product gas from the gasification furnace is introduced in the tangential direction of the inner wall surface of the combustion chamber to form a swirling flow, and the inner surface of the peripheral wall portion of the combustion chamber is formed by the heat of swirl combustion of the scattered matter entrained by the generated gas. It is common in the point that it melts in a state of adhering to the surface and flows down the wall surface and is recovered as molten slag. An object of the present invention is to solve the problem that the clinker adheres and grows on the wall surface near the air supply nozzle provided in the combustion chamber, and the air supply nozzle and the combustion chamber are blocked. In order to solve the problem, an air supply nozzle is provided on the ceiling wall of the combustion chamber and / or the product gas inlet, and air is blown into the product gas flow. As a result, mixing of the product gas and air is promoted, the temperature can be raised quickly, the clinker adhesion temperature region can be minimized, and adhesion of the clinker to the wall surface in the combustion chamber can be prevented.

Patent Document 4 discloses a combustible material melting method similar to the waste pyrolysis melting system disclosed in Patent Document 2. In this melting treatment method, combustible material and oxygen-containing gas are supplied to the primary combustion chamber, and the combustible material is partially oxidized in a reducing atmosphere to obtain combustible gas, and the ash content in the combustible material is discharged as molten slag. An oxygen-containing gas is supplied in the combustion chamber to completely burn the combustible gas. The effect of the invention of this document is that the ash content in the combustible waste can be recovered as glassy slag from which heavy metals do not elute by performing the ash content from melting to discharge in a reducing atmosphere. According to the description on page 15 lines 13 to 17 and FIG. 4, the invention of this document is based on the fact that the generated gas accompanied by the solid carbon from the fluidized bed gasifier is a gas provided in the upper part of the primary combustion chamber. The air is supplied to the supply port, and at the same time, the air is supplied to the air supply port at substantially the same position. Since both are supplied so as to form a swirl flow, both form a strong swirl flow while mixing, and high-temperature combustion is performed. Further, according to the description on page 16, lines 10 to 12 and FIG. 5, the generated gas c from the fluidized bed gasifier is in contact with a virtual circle formed by a swirling flow slightly smaller than the inner diameter of the primary combustion chamber 8. Similarly, the combustion air b is supplied so as to be in contact with the same virtual circle from four equally arranged directions. From these descriptions, in order to form a strong swirl flow in the combustion chamber and perform high-temperature combustion, the gas supply port and the air supply port are in substantially the same position and are in contact with the same virtual circle that is slightly smaller than the inner diameter of the combustion chamber. It is understood that it is important to supply. In general, it is thought that it is advantageous to supply the swirl flow so as to be in contact with the inner wall surface of the combustion chamber. Not listed.
Japanese Patent Laid-Open No. 7-229610 Japanese Patent No. 3374020 JP 2003-4214 A Republished patent WO99 / 08047

  In a waste gasification and melting treatment facility that separates gasification of wastes represented by fluidized bed type and kiln type and ash remaining after gasification separately in the gasification furnace and melting furnace, the melting furnace Then, the scattered matter accompanying the product gas generated in the gasification furnace is melted in a state where it adheres to the inner surface of the peripheral wall portion of the melting furnace by the heat of swirl combustion, and the wall surface flows down and is recovered as molten slag. The melting furnace in this case is also a combustion furnace (combustion chamber) because it performs both melting and combustion.

  The molten slag that adheres to the inner surface of the peripheral wall of the combustion chamber and flows down the wall erodes the surface of the refractory material that forms the inner surface of the peripheral wall, lowers the melting point of the eroded refractory material, and the difference in thermal expansion coefficient from the base material The part peels off. Due to this repetition, there is a problem that the refractory material is damaged to such an extent that it cannot perform its function. In order to replace a damaged refractory material, the operation of the waste treatment facility must be stopped temporarily, which reduces not only the cost of replacing the refractory material but also the operation efficiency of the treatment facility. Therefore, in order to reduce the replacement frequency, it is necessary to prevent the refractory material from being damaged by the molten slag as much as possible.

  On the other hand, in the waste gasification and melting treatment facility where the gasification of the waste represented by the shaft type and the melting of the ash remaining after gasification are both performed in a vertical furnace, the carbide generated by pyrolysis is It flows down in the vertical furnace and burns, leaving ash. The ash content is further heated and melted in a high-temperature hearth at the bottom of the vertical furnace to form molten slag and recovered from the outlet. For this reason, there are relatively few scattered matters accompanying the generated gas generated in the vertical furnace. Therefore, the main function required in the combustion chamber following the vertical furnace is the combustion of the produced gas, and the function of recovering the molten slag is not necessary. However, there is a problem that although the amount of scattered matter accompanying the generated gas is small, it becomes molten slag, adheres to the inner surface of the peripheral wall portion of the combustion chamber, flows down the wall surface, and gradually erodes the surface of the refractory material. If it is possible to prevent the molten slag from adhering to the wall surface of the combustion chamber and remove the scattered matter with a subsequent dust removing device, it is possible to reduce the replacement frequency of the refractory material and increase the operating efficiency of the processing equipment.

  Therefore, the object of the present invention is to adhere molten slag to the wall surface of the combustion chamber even when the product gas generated by pyrolyzing the waste is introduced into the combustion furnace with the scattered matter in the waste gasification and melting treatment facility. An object of the present invention is to provide a combustion furnace and a waste treatment facility capable of burning while preventing the above.

  The inventor of the present application supports the formation of a swirling flow because the main function required in the combustion chamber following the vertical furnace based on various kinds of knowledge and experiments is the combustion of the produced gas and the function of recovering the molten slag is not necessary. It has been thought that it is effective to achieve the above-mentioned purpose to perform the mixing of the flammable gas and the generated gas at a position away from the wall surface of the combustion chamber.

  Therefore, the first invention of the present application includes a combustion chamber, a combustion support gas supply means for supplying the combustion support gas so that a swirling flow is formed in the combustion chamber, and a combustion gas discharge port communicating with the combustion chamber. The combustible gas supply means for supplying the combustible gas into the combustion chamber is provided between the combustion support gas supply means and the discharge port, and the axis of the combustible gas supply means is coaxial with the combustion chamber and the combustion chamber. It is a combustion furnace characterized by being in contact with a virtual circle having a diameter smaller than the inner diameter.

  The second invention of the present application is a waste treatment facility comprising a vertical furnace that performs both gasification of waste and melting of ash remaining after gasification, and a combustion furnace that burns combustible gas generated in the vertical furnace The combustion furnace includes a combustion chamber, combustion support gas supply means for supplying the combustion support gas so that a swirl flow is formed in the combustion chamber, and a combustion gas discharge port communicating with the combustion chamber. The combustible gas supply means for supplying the combustible gas into the combustion chamber is provided between the combustion support gas supply means and the discharge port, and the axis of the combustible gas supply means is coaxial with the combustion chamber and from the inner diameter of the combustion chamber. It is a waste treatment facility characterized by being in contact with a virtual circle having a small diameter.

  As described above, according to the combustion furnace and the waste treatment facility of the present invention, even if the product gas generated by pyrolyzing the waste is introduced into the combustion furnace while being accompanied by the scattered matter, It is possible to burn while preventing the slag from adhering.

  EXAMPLES Next, although an Example demonstrates this invention concretely, this invention is not limited by these Examples.

  1 and 2, a plasma torch 1 is provided near the bottom of the shaft furnace body 2, and a first air supply means 3 and a second air supply means 4 are provided thereabove. In this embodiment, the plasma torch 1 is provided at two locations on the circumference of the same height of the furnace body, and the direction of the hot air blown out from the plasma torch 1 is the diameter direction of the furnace body and the furnace bottom direction. The first air supply means 3 and the second air supply means 4 are also provided at six locations on the circumference. The air blown from the first air supply means 3 and the second air supply means 4 may be one that has been heated to a high temperature by exchanging heat with the high-temperature gas of the secondary combustion furnace using a heat exchanger.

  A refractory material 202 is attached inside the outer shell 201 of the furnace body 2. In addition, the furnace body 2 has a structure in which the furnace body 20 and the furnace bottom body 21 are joined, and the furnace bottom body 21 is suspended from the furnace body 20, and if necessary, the furnace bottom body 21 is a cart (see FIG. (Not shown) and can be moved to a predetermined location. Therefore, it is easy to inspect and repair the inside of the furnace bottom body 21 and the plasma torch 1 and the furnace body 20. A supply port 5 is provided at a substantially middle portion in the vertical direction of the furnace body 2, and a pusher 6 is connected to the supply port 5, and a combustible dust supply device 7 and a coke supply device 8 are connected to the pusher 6. Yes. The combustible waste supply device 7 and the coke supply device 8 are provided with a double butterfly valve (not shown) to block the entry of outside air as much as possible. An exhaust gas port 9 is provided in the vicinity of the upper portion of the furnace body 2, and the secondary combustion furnace 10, the primary cooling tower 11, the heat exchanger 12, the secondary cooling tower 13 and the dust collector 14 are connected to the exhaust gas port 9. In addition, an attracting fan and an exhaust tower (not shown) are connected after the dust collector 14. A molten slag discharge port 23 communicating with the inside of the furnace body 2 is provided in the furnace bottom portion 22 of the furnace body 2, and a slag tank 15 and a slag cooling water tank 16 are provided in connection therewith.

In FIG. 1, combustible waste is charged into a shaft furnace 2 together with coke and limestone, and the combustible gas generated there is discharged from the upper part of the furnace into the secondary combustion chamber 10. In the secondary combustion chamber 10, a combustible component contained in the gas is burned in a reducing atmosphere, the nitrogen compound is decomposed into N _2. In order to prevent generation of dioxins, secondary combustion is performed such that the combustion temperature is in the range of 1000 to 1200 ° C. and the residence time of the product gas is 2 seconds or more. This combustion gas is cooled to 500 to 700 ° C. in the primary cooling chamber 11, then heat-exchanged in the heat exchanger (air preheating chamber) 12, and then quickly passes through the dioxin resynthesis temperature region in the secondary cooling chamber 13. Therefore, it is rapidly cooled to 150 to 200 ° C., and detoxified exhaust gas is discharged into the atmosphere through a dust collector 14 in which activated carbon and slaked lime are mixed to neutralize harmful gas (chlorine gas or the like). The dust generated in the secondary combustion chamber 10, the primary cooling chamber 11, the secondary cooling chamber 13, and the heat exchanger 12 is collected in one place, solidified, and can be reused.

FIG. 2 shows a gasification melting furnace according to another embodiment of the present invention. The cylindrical shaft furnace 2 has an upper part 2a that communicates with the secondary combustion chamber 10 via an outlet 9, an intermediate part 2b below it, a reduced diameter part 2c, and a hearth part 2d. In the middle of the intermediate portion 2b, there is provided an inlet 5 for garbage (for example, low-moisture municipal waste) R and coke C, and a burner (see FIG. 5) is connected to the secondary combustion chamber 10 via the outlet 9. (Not shown) is installed. The burner is not used during normal operation, but may be used when high-moisture content garbage is thrown in or when the furnace is started up. An air supply means (tuyere) 3 is provided in the reduced diameter portion 2c, a plasma torch 11 is attached to the hearth portion 2d, and a spout 23 is formed at the bottom of the hearth portion 2d.

The shaft furnace 2 has a waste / rich layer 261 (height h1) mainly composed of dust, a waste / coke mixed layer 262 (height h2) in which waste and coke are almost equally divided, and a coke mainly. A coke rich layer 263 (height h3) is formed in order from the top. With the gasification melting furnace 2 of FIG. 2, it is possible to treat garbage as follows. The coke C is filled in the hearth 2d, and the coke is burned by the high-temperature air in the plasma state sent to the coke rich layer 263 through the plasma torch 1 to sufficiently heat the inside of the furnace. When garbage R and coke C (which may be further mixed with limestone if necessary) are charged into the dust / rich layer 261 from the inlet 5, the dust / rich layer 261 is filled with air supplied from the air supply means 3. A part of the dust R and the coke C are combusted, and further thermally decomposed into combustible gas and carbide by the high temperature gas rising from the plasma torch 11 and the coke layer 25 while moving downward. The carbide generated in this combustion process burns with the air supplied from the air supply means 3 while descending, and becomes ash (1000 to 1500 ° C.) when reaching the coke rich layer 263. The ash is further heated by the heat (about 1300 ° C.) by the plasma torch 11 and the coke layer 25 to melt and become slag, and is heated to about 1500 ° C.

  The combustible gas generated in the combustion / pyrolysis process is discharged from the outlet 9 to the secondary combustion chamber 10. On the other hand, the carbide is further heated as it approaches the furnace bottom, and when it reaches the vicinity of the plasma torch 11, it melts, separates into slag mainly composed of oxide and metal, and is discharged from the discharge port 23. In the hearth, a gap is formed by the coke, and the coke is difficult to get wet with the molten slag. The discharged slag can be separated into slag and metal after cooling and reused.

  FIG. 3 is a partially enlarged sectional view of the secondary combustion chamber 10. The combustion-supporting gas supply means 31 is provided at the uppermost position of the secondary combustion chamber 10 and a position below it, and the combustion-supporting gas (air, oxygen-enriched air, oxygen-containing gas) is divided into two stages. Supplied. Three or more stages can be used. The combustible gas supply means 28 is provided between the two stages of the combustion support gas supply means 31 at a position close to that of the upper stage. Supplying at least a part of the combustion-supporting gas at a position higher than the position where the combustible gas is supplied (upstream side) covers the inner wall surface of the secondary combustion chamber 10 with the combustion-supporting gas and entrains the scattered matter. It aims at the effect which makes it difficult to contact an inner wall surface when flammable gas is supplied.

4 is a cross-sectional view taken along line AA in FIG. One stage of the combustion-supporting gas supply means 31 is equally divided in the circumferential direction so as to easily form a swirl flow. In order to easily obtain the above-described effect in the first invention, the combustion-supporting gas a is supplied so as to form a swirling flow in the combustion chamber. To form a swirl flow is not always necessary to supply in contact with combustion-supporting gas into the combustion chamber surface, the virtual circle when the supply flow rate is high is less than the inner diameter of and a combustion chamber in the combustion chamber coaxially diameter C ₁ The fuel gas may be supplied so that the extended axis of each combustion-supporting gas supply means 31 is in contact with each other. Normally, the amount of supply of the combustion-supporting gas in one stage is larger than the supply amount of combustible gas, so that a swirl flow is easily formed even if the virtual circle is small. When the supply flow rate is small, it may be supplied so as to be in contact with the inner surface of the combustion chamber, or may be supplied so as to be in contact with a virtual circle close thereto.

5 is a cross-sectional view taken along arrow BB in FIG. The combustible gas b accompanied by the scattered matter is supplied so as to be mixed with the combustion-supporting gas at a position slightly away from the inner wall surface in order to make it difficult to contact the inner wall surface. Combustible gas supplying means 28 extended axis provided so as to contact the imaginary circle C ₂ of smaller diameter than the inner diameter of and a combustion chamber in the combustion chamber coaxially thereof. If the combustion-supporting gas and the combustible gas are mixed at a position slightly away from the inner wall surface, the probability of collision of the molten slag with the inner wall surface decreases, and the combustion heat hardly reaches the inner wall surface of the combustion chamber. The effect that the temperature of the wall surface does not rise to the temperature at which the scattered matter adhered thereto is melted can be obtained. For this reason, adhesion of molten slag is reduced and damage to the refractory material on the inner wall surface can be reduced.

Using the gasification melting furnace (vertical furnace) shown in FIG. 2 and the combustion furnace shown in FIGS. The processing conditions are shown below.
(Vertical furnace)
・ Types of combustible waste: General waste (mainly household waste)
-Moisture content: 55% by weight
・ Lower heating value: 358 KJ / kg
・ Ash content: 8% by weight
・ Combustible waste supply: 1000 kg / hr
・ Coke supply: 20 kg / hr
・ Total air volume: 700 Nm ³ / hr
・ Air volume from plasma torch: 150 Nm ³ / hr
[Combustion furnace]
・ Internal dimensions: φ3.6m x H15m
・ Combustible gas volume: 9000 Nm ³ / hr
・ Secondary air (flammable gas) volume (top): 11000 Nm ³ / hr
-Secondary air (flammable gas) amount (lower): 11000 Nm ³ / hr
・ Circulating exhaust gas volume: 8000 Nm ³ / hr

  The temperature of the hot air supplied from the plasma torch during the melting process under the above conditions is about 1800 ° C., the atmospheric temperature of the coke layer 25 at the furnace bottom is 1500 ° C., and the pressure at the furnace bottom 22 is positive on average. The pressure was 1.5 kPa. The temperature of each part in the furnace body 2 was substantially constant at about 1500 ° C. in the coke layer 25, and was 500 to 900 ° C. in the space above the combustible dust layer 26. This temperature went up and down because combustible garbage is supplied in batches at a rate of 1 / min, but at the moment of supply, moisture in the combustible garbage evaporates, so heat is taken away and the temperature drops. is there. About 60 minutes after starting to supply combustible waste, molten slag began to be discharged from the molten slag outlet 23. The average discharge of molten slag was about 80 kg per hour.

The results of the product gas combustion treatment are shown in Table 1. A swirl flow was formed by supplying the combustion-supporting gas. It can be seen that the adhesion of the molten slag to the inner wall surface decreases as the imaginary circle supplying the combustible gas becomes smaller than the inner diameter of the combustion furnace. Since the combustion-supporting gas a and the combustible gas b are mixed and burned at a position slightly away from the inner wall surface, the temperature rise on the inner wall surface is reduced. The virtual size of the circle C ₂ do not affect the miscibility supplying a combustible gas for swirling flow is formed by the flow-rich combustion supporting gas for mixing of both gases.

  The adhesion state of the molten slag on the inner wall surface of the combustion furnace under the conditions of Example 1 is shown in FIG. There is almost no adhesion of molten slag. Under the conditions of Examples 2 and 3, as shown in FIGS. 7 and 8, a slight adhesion M was observed in the vicinity of the supply port of the combustible gas. Under the conditions of Comparative Example 1, a large amount of adhesion M was observed in a wide range from the vicinity of the combustible gas supply port to the downstream side of the swirl flow as shown in FIG. 9, and damage to the refractory material was observed. This is because the combustion-supporting gas a and the combustible gas b are mixed and burned at a position where they come into contact with the inner wall surface, so that the temperature rise of the inner wall surface is large and molten slag is likely to adhere.

  In the waste gasification and melting treatment facility, the present invention prevents molten slag from adhering to the wall surface of the combustion chamber even if the product gas generated by pyrolyzing the waste is introduced into the combustion furnace with accompanying scattered matter. A combustion furnace and a waste treatment facility capable of combustion are provided.

It is the schematic which shows an example of the whole flow of the waste gasification melting equipment to which the combustion furnace and waste processing equipment of this invention are applied. It is sectional drawing which shows an example of the gasification melting furnace which can be used for the waste disposal facility of this invention. It is a partial sectional view of the combustion furnace of the present invention. It is an AA cross-sectional arrow view in FIG. It is a BB cross-sectional arrow view in FIG. It is a schematic diagram which shows the molten slag adhesion state in the inner wall surface of the combustion furnace of Example 1. FIG. It is a schematic diagram which shows the molten slag adhesion state in the inner wall face of the combustion furnace of Example 2. FIG. FIG. 6 is a schematic diagram showing a state of adhesion of molten slag on the inner wall surface of the combustion furnace of Example 3. 6 is a schematic diagram showing a state of adhesion of molten slag on the inner wall surface of the combustion furnace of Comparative Example 1. FIG.

Explanation of symbols

2 Shaft furnace body 3 First air supply means 4 Second air supply means 11 Plasma torch 5 Supply port 6 Pusher 7 Combustible dust supply device 8 Coke supply device 9 Exhaust gas port
10 Secondary combustion furnace
11 Primary cooling tower
12 Heat exchanger
13 Secondary cooling tower
14 Dust collector
22 Furnace bottom
23 Molten slag outlet
201 outer shell
202 Refractory material
20 Furnace body
21 Furnace bottom body
28 Combustible gas supply means
31 Combustion gas supply means a Combustion gas b Combustible gas C ₁ , C ₂ virtual circle M Adhesion of molten slag on the inner wall of the combustion furnace

Claims (2)

A combustion chamber, a combustion support gas supply means for supplying the combustion support gas so that a swirling flow is formed in the combustion chamber, and a combustion gas discharge port communicating with the combustion chamber. The combustible gas supply means is provided between the combustion support gas supply means and the discharge port, and the axis of the combustible gas supply means is coaxial with the combustion chamber and is in contact with a virtual circle having a diameter smaller than the inner diameter of the combustion chamber. A combustion furnace characterized by that. A waste treatment facility comprising a vertical furnace that performs both gasification of waste and melting of ash remaining after gasification, and a combustion furnace that burns combustible gas generated in the vertical furnace,
The combustion furnace includes a combustion chamber, combustion support gas supply means for supplying the combustion support gas so that a swirling flow is formed in the combustion chamber, and a combustion gas discharge port communicating with the combustion chamber. A flammable gas supply means for supplying a flammable gas is provided between the flammable gas supply means and the discharge port, and the axis of the flammable gas supply means is coaxial with the combustion chamber and has a diameter smaller than the inner diameter of the combustion chamber. A waste treatment facility that touches a circle.

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