JP2008082630A - Waste melting furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waste melting furnace capable of properly thermally decomposing waste by expanding a distribution of waste on a high-temperature combustion zone in a furnace body radially outward. <P>SOLUTION: This waste melting furnace comprises a tuyere disposed around the furnace body for sending the combustion air into the furnace body 10, a coke chute 60 formed at a furnace top central portion of the furnace body 10 for dropping and charging coke into the furnace body 10, a plurality of cylindrical waste receiving tanks 50 disposed around the coke chute 60 for receiving and storing the waste, and opened at its bottom portion for dropping and charging the waste into the furnace body 10, a waste distributing device 40 for distributing the waste into the plurality of waste receiving tanks 50, and a waste conveying device 30 for conveying and charging the waste into the water distributing device 40. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a waste melting furnace.

  As a technology for processing waste, gasification and melting processing is performed by pyrolyzing waste such as municipal waste and shredder dust in a melting furnace to generate flammable gas, melting the residue after the pyrolysis and discharging it into slag There is. This treatment method has the advantage that the waste heat can be recovered by gasifying the waste, and the residue can be melted for easy handling in landfills and the final disposal amount can be reduced. Have.

  There are several types of melting furnaces that perform the above-described treatment, and one of them is a shaft type waste gasification melting furnace having a vertical furnace body. This shaft-type waste gasification and melting furnace is known, for example, to have a structure shown in Patent Document 1, and burns coke deposited on the bottom of the furnace and discards it on the high-temperature coke combustion section. This is a furnace in which an object is introduced from the top of the furnace, thermally decomposed into gas in the furnace, and then the residue after the pyrolysis is melted in a coke combustion part to form slag. For this reason, in the shaft type waste gasification and melting furnace, a region in which the furnace body is divided into three in the vertical direction is formed in view of the function of the furnace body. That is, the three regions are a high-temperature combustion zone formed by depositing coke on the bottom of the furnace in the furnace body, a waste deposition layer formed by waste put on the high-temperature combustion zone, and the waste deposition It is a free board part formed as a large space above the surface of the layer and in the upper part of the furnace body. Then, air or oxygen-enriched air (hereinafter referred to as “oxygen-containing gas”) is blown into each of the above regions.

  The high-temperature combustion zone is provided with main tuyere at multiple locations in the circumferential direction, and oxygen enrichment to burn the coke deposited and deposited to melt the residue after the waste in the waste layer is pyrolyzed Air is blown from this main tuyere. The waste accumulation layer is provided with a plurality of sub tuyere in the circumferential direction, and air from which the deposited waste is partially burned and thermally decomposed while gently flowing the waste from the sub tuyere. Infused. In addition, the freeboard section is provided with a three-stage tuyere, and the air for maintaining the inside at a predetermined temperature by partially combusting the pyrolysis gas (combustible gas) generated by pyrolyzing the waste. It is blown from the stage tuyere.

  As described above, the shaft-type waste gasification and melting furnace is a facility for pyrolyzing and gasifying and melting waste in a single furnace. The input waste is pyrolyzed and separated into gas and residue. Since the gas contains a large amount of flammable gas, it is burned in a secondary combustion furnace, recovered by heat in a boiler or economizer, cooled by a temperature reducing device, removed from harmful gases, and dust-removed by a dust collector. Dissipated inside. Further, the residue after pyrolysis moves downward in the furnace body, is melted in the high temperature coke combustion zone at the lower part of the furnace, and is discharged out of the furnace as slag and metal.

In Patent Document 1, waste to be treated is thrown into a hopper by a crane from a waste pit, or conveyed by a screw conveyor or the like, and provided in the center of the furnace top together with limestone as coke or a slag property adjusting agent. It is charged into the furnace from the charging port. Alternatively, waste and coke and limestone auxiliary materials are separately charged into the furnace from the charging port.
JP 9-60830 A

  Conventionally, waste and coke are charged into the furnace body from the inlet provided at the center of the top of the furnace by a supply device, and the waste is deposited in a shaft type gasification and melting furnace so that the center is a mountain. Yes. In particular, it is not supplied so as to adjust the deposition height distribution in the horizontal direction, and the input amount is not controlled so as to adjust the horizontal direction distribution over time. Thus, coke and waste are not charged so that the deposition distribution within the furnace is controlled.

  In the case of a large gasification melting furnace, if the waste is distributed in the melting furnace so that the center is a mountain, the distance between the center where much waste is accumulated and the tuyere provided on the furnace wall increases. For this reason, the oxygen-containing gas from the tuyere does not reach the waste sufficiently, and the flow and thermal decomposition of the waste may not be performed well. In addition, coke accumulates at the bottom of the furnace to form a high-temperature combustion zone of the coke bed, and this coke contributes to the flow of oxygen-containing gas and generated gas in the gap between the coke and coke, and the molten pyrolysis residue It also functions as a grate so that can flow smoothly. However, if the coke is unevenly distributed or charged so that the gap between the coke and the coke is not secured, the above functions cannot be performed, resulting in deterioration of gas flow and stagnation of the melt. The situation inside the furnace deteriorates and the gasification melting furnace may not be operated stably.

  The present invention has been made to solve the above-described problems, and is provided with a coke installation in which a gap between the coke and the coke is ensured so as not to cause deterioration of gas flow in the waste melting furnace and retention of the melt. The purpose of the present invention is to provide a waste melting furnace that can be charged with an appropriate distribution of deposits so that waste can be sufficiently flowed and thermally decomposed even in a large melting furnace. .

  In the waste melting furnace according to the present invention, a high temperature combustion zone of coke is formed at the lower part of a vertical furnace body, and a waste accumulation layer is formed on the high temperature combustion zone, respectively. Is thermally decomposed and the residue is melted.

  In such a waste melting furnace, the present invention relates to a tuyere provided around the furnace body so as to send combustion air into the furnace body, and coke provided in the center of the furnace top of the furnace body. Coke chute to be dropped and loaded around the coke chute, receiving waste and storing it, opening the bottom and receiving a plurality of cylindrical wastes to drop and charge the waste into the furnace A tank, a waste distribution device that distributes the waste to the plurality of waste receiving tanks, and a waste transfer device that transfers the waste to the waste distribution device. .

  In the waste melting furnace of the present invention having such a configuration, coke falls from the coke chute at the center of the furnace top and is deposited in the lower part of the furnace. This coke burns to form a high temperature combustion zone. On the other hand, after the waste is temporarily stored in a waste receiving tank provided around the coke chute, it is dropped into the furnace body by opening the bottom of the waste receiving tank, and is disposed at a distance from the center of the furnace. To form a distributed waste accumulation layer having an annular peak around the central portion.

  Thus, the waste accumulation layer on the high-temperature combustion zone is distributed with an annular mountain and is formed at a position close to the inner peripheral wall of the furnace body, so that heat from the high-temperature combustion zone is received and air from the tuyere is effective. And flow, and promotes thermal decomposition of waste.

  In the present invention, the waste distribution device includes a receiving chute for receiving waste, a movable charging chute provided above the receiving chute, and a driving device for driving the charging chute, and the receiving chute described above. Is provided above the waste receiving tank and has a dropping port arranged corresponding to each waste receiving tank, and the charging chute is for charging waste into the receiving chute. The drive unit sequentially moves the input port of the input chute to a position corresponding to each drop port of the receiving chute and is transferred from the waste transfer device to the input chute. It is preferable that the waste is thrown into the receiving chute from the charging chute inlet and dropped into the furnace through the receiving chute drop.

  In such a configuration, the input port of the input chute sequentially moves to a position corresponding to each drop port, and waste is input from the input port to the drop port corresponding to the input port. As a result, the waste is sequentially charged into the waste receiving tanks corresponding to the respective drop openings through the input openings. As a result, uniform waste can be easily charged into all waste receiving tanks only by moving the position of the inlet.

  In the present invention, the charging chute has a cylindrical shape in which a receiving port for receiving the waste loaded from the waste transporting device is formed in the upper part, and a loading port is formed at an eccentric position with respect to the vertical axis passing through the receiving port. However, it is preferable that the charging chute receives a driving force from the driving device and rotates around the vertical axis. As a result, the charging port is moved by rotation, which is a relatively simple motion, and the configuration of the charging chute is simple.

  Each waste receiving tank preferably has a valve device for alternately charging and stopping the waste from the waste receiving tank. As a result, the operation of a simple mechanism such as the opening / closing operation of the valve device suppresses leakage of pyrolysis gas in the furnace body to the outside of the furnace body, while storing waste in the waste receiving tank and waste in the furnace body Drop charging is performed.

  The valve device has an upper valve provided on the upper side of each waste receiving tank and a lower valve provided on the lower side, and the upper valve and the lower valve are opened and closed so that when one is open, the other is closed. Preferably it is done. In this embodiment, when the upper valve is open and the lower valve is closed, the waste is stored in the waste receiving tank. On the other hand, when the upper valve is closed and the lower valve is opened, the stored waste is dropped into the furnace. In other words, since either the upper valve or the lower valve is always closed when storing and dropping the waste in the waste receiving tank, leakage of pyrolysis gas in the furnace body to the outside of the furnace body is suppressed. The

  As described above, the present invention forms a plurality of waste receiving tanks around the coke chute located at the center of the furnace top, and distributes the waste to the plurality of waste receiving tanks. In the body, on the high temperature combustion zone of coke, a waste accumulation layer is formed around the central part at a position away from the central part of the furnace body, that is, near the tuyere. Receives heat from the high-temperature combustion zone and effectively receives air from the tuyere and flows well. As a result, the waste is heated well and uniformly, and thermal decomposition is promoted. Further, since the coke is deposited in the central portion and is not unevenly distributed, the coke sufficiently functions as a grate and does not deteriorate the gas flow in the furnace body or retain the melt.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a melting furnace 1 for gasifying waste, and a supply device 20 for supplying coke and waste into the furnace body 10 is provided at the top of a vertical furnace body 10.

  The furnace body 10 is a bowl-shaped cylindrical body, and has a tapered intermediate portion 10A whose diameter is expanded upward, a lower cylindrical portion 10B positioned below the intermediate portion 10B, and a lower cylindrical portion positioned above the lower cylindrical portion 10B. And an upper cylindrical portion 10C having a larger diameter than the cylindrical portion 10B.

  In the furnace body 10, coke is deposited at the bottom of the furnace, oxygen-enriched air is blown into the coke layer and burned to form a high-temperature combustion zone, and waste is put on the high-temperature combustion zone. Thus, a waste accumulation layer is formed, the waste in the waste accumulation layer is thermally decomposed, and the residue is melted. The furnace space above the waste accumulation layer forms a free board portion.

  For this heat treatment, a molten slag discharge port 11 is provided at a position near the lower end of the peripheral wall of the lower cylindrical portion 10B, and an oxygen-containing gas for burning coke is provided at a plurality of positions in the upper position in the circumferential direction. A main tuyere 12 for blowing into the furnace is provided, and air for fluidizing the waste is blown into the furnace at a plurality of positions in the circumferential direction at a position near the tapered intermediate portion 10A at the upper position. The secondary tuyere 13 is provided.

  At the upper part of the peripheral wall of the upper cylindrical part 10C, a three-stage tuyere 14 for blowing air for partially burning the pyrolysis (combustible) gas generated in the lower part of the furnace at a plurality of positions in the circumferential direction. Is provided. Further, an exhaust pipe 16 for exhaust gas is provided on the side portion directly below the canopy portion 15 at the upper end of the upper cylindrical portion 10C.

  Next, the supply device 20 for dropping and supplying coke and waste into the furnace body 10 is provided on the canopy portion 15 of the furnace body 10 as shown in FIG.

  The supply device 20 has, as main components, a waste transport device 30 that transports the waste, and the waste transported from the waste transport device 30 and receives the waste in a plurality of waste receiving tanks 50 described later. Waste distribution device 40 for distributing the waste, receiving and storing the distributed waste, a plurality of waste receiving tanks 50 for opening the bottom and dropping the waste into the furnace body 10, and conveying the coke And a coke chute 60 for dropping and charging the conveyed coke into the furnace body 10.

  A support portion 17 is attached to the canopy portion 15 of the furnace body 10, and the coke chute 60 and a plurality of waste receiving tanks 50 are supported by the support portion 17. The coke chute 60 and the waste receiving tank 50 have a cylindrical shape that opens in the vertical direction. The coke chute 60 penetrates the support portion 17 and the canopy portion 15 and extends upward from the support portion 17. On the other hand, the waste receiving tank 50 is connected to a tubular body that penetrates the support portion 17 and the canopy portion 15 and extends upward from the support portion 17. The coke chute 60 is provided at the center of the furnace top of the furnace body 10, and a plurality of waste receiving tanks 50 are provided around the coke chute 60.

  3 is a cross-sectional view taken along the line III-III in FIG. As shown in FIG. 3, a plurality of waste receiving tanks 50 are arranged on a circumference centering on the position of the coke chute 60.

  Returning to FIG. 2, the coke chute 60 receives the coke conveyed from the coke conveying device 61 from the upper opening, and drops and supplies the coke into the furnace body 10 from the lower opening. The coke conveyance device 61 is, for example, a coke conveyor, and an opening for supplying coke enters an upper opening of the coke chute 60 as shown in FIG.

  Inside the coke chute 60, a damper 60A is provided in the vicinity of the upper opening. The damper 60 </ b> A rotates as shown by an arrow between the solid line position and the broken line position in FIG. 2 to open and close the opening of the coke transport device 61. When the weight of the coke supplied from the coke transport device 61 does not reach a predetermined value, the damper 60A is in a position to close the opening of the coke transport device 61 as shown by a solid line in FIG. At this time, the coke is on the damper 60A. On the other hand, when the weight of the supplied coke exceeds a predetermined value, the damper 60A is rotated to a position where the opening of the coke transport device 61 is opened as indicated by a broken line by the weight of the coke, and the coke passes through the coke chute 60. Is dropped into the furnace body 10. The damper 60A may be driven by a damper drive device (not shown) to open and close the opening of the coke transport device 61.

  Each waste receiving tank 50 has two gate valves. Specifically, each waste receiving tank 50 has a receiving gate valve 51 at the upper end and a charging gate valve 52 at the lower end. The receiving gate valve 51 opens and closes the upper end of the waste receiving tank 50 by opening and closing the upper valve body 51A. The closing gate valve 52 opens and closes the lower end of the waste receiving tank 50 by opening and closing its lower valve body 52A. The closing gate valve 51 and the receiving gate valve 52 are opened and closed by driving a valve driving device (not shown).

  When one of the receiving gate valve 51 and the closing gate valve 52 is open, an opening / closing operation is performed so that the other is closed, thereby alternately charging and stopping the waste from the waste receiving tank 50. Specifically, when storing waste in the waste receiving tank 50, the receiving gate valve 51 is opened and the input gate valve 52 is closed to receive the waste until a predetermined amount is received. When the waste is dropped into the furnace body 10, the receiving gate valve 51 is closed and the charging gate valve 52 is opened. Thus, by always closing one of the receiving gate valve 51 and the closing gate valve 52, the release of the pyrolysis gas in the furnace body 10 to the outside of the furnace body 10 can be suppressed.

  As shown in FIG. 2, the waste distribution device 40 is provided above the waste receiving tank 50. The waste distribution apparatus includes a receiving chute 41 that receives waste, a movable charging chute 42 provided above the receiving chute 41, and a driving device 43 that drives the charging chute 42.

  In the receiving chute 41, a circular opening for receiving waste is formed in the upper part, and a plurality of dropping openings 41A for charging the waste into each waste receiving tank 50 are branched from the upper opening and formed in the lower part. Has been. The drop port 41A is substantially equal to the diameter of the waste receiving tank 50 and is smaller than the upper opening. The number of drop openings 41A is equal to the number of waste receiving tanks 50, and each drop opening 41A is arranged corresponding to each waste receiving tank 50. In the present embodiment, each drop opening 41 </ b> A is disposed directly above each waste receiving tank 50. That is, the plurality of drop openings 41A are formed on the receiving chute 41 in a state of being arranged on the circumference.

  The input chute 42 has a bent cylindrical shape, and a receiving port for receiving the waste loaded from the waste transporting device 30 is formed in the upper portion, and is eccentric with respect to the vertical axis X passing through the receiving port. An insertion port 42A is formed at the position. The input chute 42 receives a driving force from the driving device 43 and rotates around the vertical axis X as indicated by an arrow in FIG. The rotation radius of the charging port 42A in the rotation of the charging chute 42 is substantially equal to the radius of the upper opening of the receiving chute 41. As the charging chute 42 rotates, the charging opening 42A of the charging chute 42 sequentially moves to a position corresponding to each drop opening 41A of the receiving chute 41.

  A duct 31 extends downward from the waste transport device 30, and the discharge port of the duct 31 reaches the inside of the receiving port formed in the upper part of the charging chute 42. The waste transport device 30 is formed by a screw conveyor, receives waste from a waste storage unit (not shown), transports the waste to the duct 31, and feeds the waste from the duct 31 to the charging chute 42. Yes.

  In the melting furnace 1 of the present embodiment having such a configuration, coke charging, waste receiving and charging are performed in the following manner, and then the melting process is performed.

<Coke input>
The coke is weighed together with the limestone, charged from the coke conveying device 61 into the coke chute 60, dropped into the furnace body 10, and charged. Coke accumulates in the center of the furnace bottom in the furnace body 10 to form a coke bed that becomes a high-temperature combustion zone at the time of combustion, and a gap between coke grains is secured, so it is blown from the main tuyere 12 The air permeability in the furnace is kept good without obstructing the flow of oxygen-containing gas or generated gas. In addition, when the waste is thermally decomposed, the molten material in which the thermal decomposition residue is melted smoothly flows down, and the molten material can be prevented from staying. As a result, the operation of gasifying and melting waste is stably performed without deteriorating the situation in the furnace body 10.

<Acceptance of waste>
Waste consisting of municipal waste, industrial waste, waste incineration residue, or the like is weighed and put into the input chute 42 through the duct 31 by the waste transport device 30. The input chute 42 turns and stops on any one of the drop openings 41A of the receiving chute 41, and a predetermined amount of waste is charged into one waste receiving tank 50. At this time, the receiving gate valve 51 is open and the closing gate valve 52 is closed. When the input of the waste into the one waste receiving tank 50 is completed, the charging chute rotates and stops on the adjacent drop opening 41A, and the waste is placed in the next waste receiving tank 50 immediately below it. . By repeating this operation and putting the waste into all the waste receiving tanks 50, the distribution of the waste is completed.

<Introduction of waste>
The receiving gate valves 51 of all the waste receiving tanks 50 are closed and the charging gate valve 52 is opened, and the waste stored in each of the waste receiving tanks 50 is dropped into the furnace body 10. As a result, the waste is uniformly dispersed and deposited in the furnace body 10 so as to form a mountain. When the waste is charged, the receiving gate valve 51 is closed, so that the inside and outside of the furnace body 10 are reliably sealed and isolated. In each waste receiving tank 50, the waste may be dropped into the furnace body 10 immediately after the waste is charged by opening the charging gate valve 52.

  Since the waste is annular and spreads in the radial direction and accumulates, the waste is not distributed unevenly or concentrated in the center of the furnace and distributed close to the furnace wall. The air blown from the sub tuyere 13 and the gas composed of the oxygen-containing gas and the generated gas blown from the high-temperature combustion zone formed below the waste accumulation layer will flow moderately and stably thermally decompose Is done.

<Melting treatment>
Of the waste, coke, and limestone charged into the furnace body 10, the coke is deposited on the bottom of the furnace, and hot air of oxygen-containing gas is blown into the main tuyere 12. Coke is combusted by blowing this oxygen-containing gas, and the deposited coke forms a high-temperature combustion zone. The waste accumulation layer formed on the high-temperature combustion zone is retained while flowing by the air blown from the sub tuyere 13 to form a fluidized layer. Waste is preheated while it is fluidized and is pyrolyzed to generate flammable gases. In particular, the air blown from the sub tuyere 13 flows sufficiently and evenly into the waste accumulation layer, so that thermal decomposition can be performed efficiently even in a large melting furnace, and the situation inside the furnace is not deteriorated and stable. Can operate. Regarding the situation, it was confirmed from the operational data that there was little variation in the air pressure at each tuyere and the temperature at each tuyere.

  The residue after pyrolysis of the waste is melted in the high temperature combustion zone and extracted from the molten slag discharge port 11 at the bottom of the furnace. On the other hand, the combustible gas generated by the thermal decomposition of the waste is partially burned by blowing air from the three-stage tuyere 14 in the free board portion, which is the space above the waste accumulation layer, in the furnace body 10. It is discharged from the tube 16.

  The gas discharged from the furnace body 10 is blown and burned with secondary combustion air in a secondary combustion furnace (not shown), and then sent to a boiler and an economizer for heat recovery. The heat-recovered exhaust gas is cooled to about 200 ° C. or less by spraying water in a temperature reducing tower. Next, harmful substance removing agents such as activated carbon for adsorbing and removing slaked lime powder and dioxins for removing hydrogen chloride are blown into the exhaust gas, and sent to a bag filter for dust collection.

  The present invention is not limited to the illustrated form, and various modifications can be made. In the present embodiment, the charging chute having one charging port is swiveled and moved to a position corresponding to each dropping port of the receiving chute. For example, the charging chute corresponds to each dropping port of the receiving chute. A hopper having a plurality of input ports arranged at positions may be used. Even in such a form, the waste can be easily distributed to all the waste receiving tanks. In this case, a gate valve may be provided at each input port of the input chute, and waste may be input to each drop port by opening the gate valve.

  In the present embodiment, waste is stored and charged in the waste receiving tank using the receiving gate valve and the charging gate valve, but instead of these gate valves, a rotary valve is provided at the lower part of each waste receiving tank. One may be provided to store and input waste. In this case, after putting the waste into the waste receiving tank, the rotary valve is rotated to put the waste into the furnace body. Here, the rotary valve continues to rotate until a predetermined amount of waste is charged. According to this embodiment, the number of valve devices provided in each waste receiving tank can be reduced. Moreover, since the furnace body and the outside are reliably sealed by the rotary valve, release of the pyrolysis gas in the furnace body into the furnace body can be suppressed.

  In the present embodiment, the input chute is stopped at a position corresponding to each drop port and waste is input, but waste may be input without stopping the input chute. In this case, the charging chute continues to rotate while charging the waste, and stops rotating after the charging of the waste into all the waste receiving tanks is completed. This also makes it possible to easily distribute the waste.

It is sectional drawing which mainly shows a furnace body among one Embodiment of this invention. 1 is a cross-sectional view of a supply device for supplying coke and waste to the furnace body used in the apparatus. FIG. 3 is a sectional view taken along line III-III in FIG. 2.

Explanation of symbols

10 furnace body 12 tuyere (main tuyere)
13 tuyere (deputy tuyere)
14 tuyere (three-tiered tuyere)
30 Waste Conveying Device 40 Waste Distributing Device 50 Waste Receiving Tank 60 Coke Chute

Claims (5)

  A high temperature combustion zone of coke is formed at the lower part of the vertical furnace body, and a waste accumulation layer is formed on the high temperature combustion zone, respectively, and the waste in the waste accumulation layer is thermally decomposed and the residue is melted. In the melting furnace, the tuyere provided around the furnace body so as to send the combustion air into the furnace body, and the coke provided at the center of the furnace top to drop the coke into the furnace body A chute, a plurality of cylindrical waste receiving tanks that are provided around the coke chute, receive and store the waste, open the bottom and drop the waste into the furnace, and the plurality of waste receiving tanks A waste melting furnace comprising: a waste distribution device that distributes waste to a waste receiving tank; and a waste conveyance device that conveys and charges the waste to the waste distribution device.   The waste distribution device includes a receiving chute for receiving waste, a movable charging chute provided above the receiving chute, and a driving device for driving the charging chute, wherein the receiving chute is a waste It is provided above the receiving tank and has a dropping port arranged corresponding to each waste receiving tank, and the charging chute has a charging port for charging waste into the receiving chute. The drive device sequentially moves the input port of the input chute to a position corresponding to each drop port of the receiving chute, so that the waste conveyed to the input chute is transferred from the waste transfer device. The waste melting furnace according to claim 1, wherein the waste melting furnace is charged into the receiving chute from the charging chute inlet and dropped into the furnace body from the receiving chute dropping hole.   The charging chute has a cylindrical shape in which a receiving port for receiving waste transported from the waste transporting device is formed at the top, and a loading port is formed at an eccentric position with respect to the vertical axis passing through the receiving port, The waste melting furnace according to claim 2, wherein the charging chute receives a driving force from a driving device and rotates around the vertical axis.   The waste according to any one of claims 1 to 3, wherein each waste receiving tank has a valve device for alternately charging and stopping the waste from the waste receiving tank. Melting furnace.   The valve device has an upper valve provided on the upper side of each waste receiving tank and a lower valve provided on the lower side, and the upper valve and the lower valve are opened and closed so that when one is open, the other is closed. The waste melting furnace according to claim 4 to be performed.

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