JP2005207684A - Inert gas sealing method and device for sealed waste incineration equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a capacity of a nitrogen generating device by reducing the consumption of a nitrogen gas. <P>SOLUTION: This sealed waste incineration equipment is constituted by successively connecting a hopper 1, a crusher 2, a mixer 3, a pressure feed pump 4, a transport pipe 5 and an incinerator 6 in a state of keeping airtightness. Interlocking chambers 12, 14 are mounted at an upstream side of the hopper 1, and the crusher 2, the mixer 3, the interlocking chambers 12, 14 and other equipment parts are respectively connected with a reservoir tank 23 connected with the nitrogen generating device 15, through nitrogen sealing pipes 16a with opening and closing valves 24. A controller 26 is mounted to give intermittent opening and closing commands to each of the opening and closing valves 24 in accordance with signals input from an oxygen concentration sensor 25. Each opening and closing valve 24 is intermittently opened and closed when the oxygen concentration becomes 4% or more to alternately seal and diffuse the nitrogen gas 17, whereby a low oxygen state can be efficiently formed in an equipment system with the small amount of nitrogen gas 17. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention comprises a hopper, a crusher, a mixer, a pressure pump, and an incinerator connected in order from the upstream side so as to maintain a sealed state, and crushes general waste such as industrial waste and municipal waste thrown into the hopper. After crushing with a machine, kneaded with a mixer to form high-viscosity waste, and the high-viscosity waste is pumped to an incinerator with a pressure-feed pump and incinerated for incineration. The present invention relates to an inert gas sealing method and apparatus for a closed-type waste incineration processing facility used for sealing an inert gas in a facility system in order to prevent explosion and ignition of a processing object.

  In recent years, disposal of industrial waste has become one of the serious social problems. The amount of industrial waste discharged has been increasing year by year, but as a treatment method there are legal regulations concerning landfill treatment due to problems such as pollution and air pollution caused by the dumping of harmful substances into the natural environment, and problems with final disposal sites. Today, incineration is becoming mainstream.

  When incinerating industrial waste in this way, chemicals such as waste oil, waste paint, waste paint, solvent, etc., which are handled in a closed state, particularly in industrial waste, packed and sealed in containers such as drums Combustible waste including waste and heavy metals, or business-related industrial waste such as medical waste is very difficult to handle, so these industrial waste is exposed to the atmosphere or workers are It is desirable to be able to process in a state where there is no risk of contact with industrial waste.

  For this reason, industrial waste carried in these drum cans can be incinerated in a completely sealed state with little human intervention, and the drum can be opened and removed from the inside. Can eliminate the risk of exposure to industrial waste, eliminates the need for a post-treatment process for drums from which industrial waste has been removed, and is completely sealed so that it can be deodorized and hygienic. Sealed waste incineration equipment having certain advantages has been developed.

  As shown in FIG. 2, an outline of an example of such a closed waste incineration processing equipment is as follows. From the upstream, a hopper 1, a crusher 2 such as a biaxial crusher, a mixer (kneading device) 3, and a pressure pump such as a piston pump 4, a transport pipe 5, an incinerator 6 such as a rotary kiln, and other necessary exhaust gas treatment devices (not shown) are connected and maintained so as to maintain a sealed state. Thereby, the industrial waste packed in a sealed state in the drum can 7 is put into the hopper 1 together with the drum can 7 without opening the lid of the drum can 7, and then the drum can 7 is crushed by the crusher 2. The industrial waste packed in the drum can 7 is taken out, and at the same time, the drum can 7 itself is crushed to a fine size that does not hinder the kneading by the subsequent mixer 3 and the pressure feeding by the pressure feeding pump 4. At this time, the general waste 9 such as garbage stored in the container 8 is put into the hopper 1 together as an industrial waste transportation auxiliary medium (carrier) and is crushed finely by the crusher 2. Like that. Thereafter, the crushed material crushed by the crusher 2 is supplied to the mixer 3 and kneaded (mixed) to form a homogeneous waste high-viscosity waste 10 having a pumpable property. It is like that. After that, the high-viscosity waste 10 formed by the mixer 3 is pumped through the transport pipe 5 by the pumping pump 4 to be put into the incinerator 6 and incinerated in the incinerator 6. .

  By the way, in the said crusher 2, when crushing processed materials, such as a drum can 7, a spark may generate | occur | produce. On the other hand, the industrial waste to be incinerated in the drum can 7 may contain explosive or flammable substances such as a solvent. For this reason, the drum can 7 is put into the hopper 1. After that, when the material is crushed by the crusher 2 and opened, or when crushing or crushing is performed, an explosive or flammable gas may be generated. Therefore, even if an explosive or flammable gas is generated in association with the opening process, crushing process, or crushing process of the industrial waste packed in the drum 7 in the crusher 2, the explosion of the gas It is necessary to prevent ignition.

  For this purpose, an interlocking chamber 12 is provided at a connecting portion with a downstream end portion of the drum can conveyor 11 serving as a charging portion of the drum can 7 in the hopper 1 and accommodated in the container 8 in the hopper 1. An interlocking chamber 14 is provided at a connecting portion with the downstream end of the container lift 13 for introducing the general waste 9, and an inert gas generation source is provided in each of the interlocking chambers 12, 14. Are connected to each other via a nitrogen-filled tube 16. As a result, the drum can 7 transported by the drum transport conveyor 11 is once received in the interlocking chamber 12 and nitrogen introduced into the interlocking chamber 12 from the nitrogen generator 15 through the nitrogen sealing tube 16. By filling the gas 17, the atmosphere around the drum can 7 is replaced with the nitrogen gas 17 atmosphere, and then the hopper 1 is charged. On the other hand, the general waste 9 accommodated in the container 8 is transported by the container lift 13 integrally with the container 8, and then temporarily received from the container 8 into the interlocking chamber 14. In the same manner as described above, the atmosphere around the general waste 9 is replaced with the nitrogen gas 17 atmosphere by sealing the nitrogen gas 17 introduced from the nitrogen generating device 15 through the nitrogen sealing tube 16, and then the hopper 1. It is supposed to be thrown in.

  Further, the nitrogen sealing tube 16 for sealing the nitrogen gas 17 introduced from the nitrogen generator 15 in the same manner as the nitrogen sealing tube 16 in the required portions (not shown) of the crusher 2, the mixer 3, and other equipment parts. Are connected to each other so that the nitrogen gas 17 can be constantly sealed in the crusher 2, the mixer 3, and other parts of the equipment.

  Therefore, the interlocking chambers 12 and 14 prevent the outside air from entering along with the drum 7 and the general waste 9 introduced into the hopper 1, and the crushing machine from each nitrogen sealed tube 16. 2 and mixer 3 are appropriately filled with nitrogen gas 17 and purged, so that the oxygen concentration inside the equipment is kept below a certain level (for example, 4% or less). Even if explosive or flammable gas is generated in the system due to the opening process, crushing process, or crushing process of the packed industrial waste, it is possible to prevent the occurrence of a fire (for example, Patent Document 1). reference).

  In addition, the waste liquid 18 from the waste liquid receiving tank 19 that receives and stores the waste liquid 18 such as waste oil and solvent carried by a tank lorry at the downstream side of the crusher 2 and the upstream side of the kneading device 3. And a sludge supply device 22 such as a chain conveyor is connected so that the sludge 21 accumulated in the inner bottom portion of the waste liquid receiving tank 19 can be conveyed. When the crushed material crushed by the crusher 2 is supplied to the mixer 3 and kneaded, the waste liquid 18 guided from the waste liquid receiving tank 19 through the waste liquid supply pipe 20 or a sludge supply device as necessary. High-viscosity waste formed in the mixer 3 by adding the sludge 21 conveyed at 22 as a viscosity adjusting component and kneading together. And also it has been conventionally proposed to allow to adjust the viscosity of 10 (for example, see Patent Document 2).

  It should be noted that the amount of the inert gas sealed when the inert gas is sealed in the apparatus so that the internal gas can be prevented from being ignited or ignited in a conventional apparatus that may generate flammable internal gas. For example, in the coke dry fire extinguishing equipment that dry extinguishes hot red coke by circulating an inert gas, an upstream gate valve for cutting cooling coke from the bottom of the cooling tower is provided on the upstream side. After a certain amount of coke cut to the side has been stored, the intermediate detected by the combustible component concentration detector provided in the intermediate bunker into the intermediate bunker for cutting having a lower gate valve for cutting it out to the outside An inactive gas is always supplied so as to have a flow rate corresponding to the concentration of the flammable component in the bunker. Furthermore, even in the constantly supplied state of the inactive gas, the ignition detector provided in the intermediate bunker should be used. At When the occurrence of a fire in the middle bunker is detected, ignition prevention device so as achieve extinguishing by increasing the flow rate of the inert gas has been conventionally proposed (e.g., see Patent Document 3).

  In addition, when a gas that causes an explosion, such as oxygen or a flammable gas, leaks in the battery container in which the fuel cell body is stored, due to the leak of cathode gas and anode gas from the fuel cell body, A fuel cell container gas supply mechanism for supplying an inert gas into the battery container to dilute the gas causing the explosion and discharge it to the outside of the container so that the explosion can be prevented in advance. In the above-mentioned battery container, an oxygen concentration detector or a combustible gas concentration detector is attached, and the above-described battery of oxygen or flammable gas or the like causing explosion due to leakage of anode gas or cathode gas by these detectors. When the concentration in the container is detected and the detected concentration is within a range of a predetermined value set to a value that does not cause explosion, an inert gas to the battery container is detected. The supply is stopped, and the inert gas is supplied into the battery container only when the detected concentration of the gas causing the explosion by the detector exceeds the specified value. Thus, it has been proposed in the past to reduce the consumption of inert gas (see, for example, Patent Document 4).

JP 2003-154252 A JP 2003-130320 A Japanese Utility Model Publication No. 62-34977 JP-A-5-266905

  However, the conventional sealed waste incineration facility shown in FIG. 2 is inactive guided to the crusher 2, the mixer 3, and the interlocking chambers 12 and 14 from the nitrogen generator 15 through the nitrogen sealing tube 16. Since nitrogen gas 17 which is a gas is always sealed, it is possible to prevent the occurrence of fire in the apparatus even when processing drum cans 7 filled with explosive and flammable industrial waste. Can be processed safely. However, since the nitrogen gas 17 is continuously supplied and sealed, the consumption amount of the nitrogen gas 17 is large. Therefore, the nitrogen generator 15 as a supply source of the nitrogen gas 17 has a capacity. The fact is that it is necessary to use a larger one.

In addition, what is described in Patent Document 3 always supplies an inert gas into the intermediate bunker for cutting in the coke dry fire extinguishing equipment so as to have a flow rate according to the concentration of the combustible component in the intermediate bunker, Furthermore, in the unlikely event that a fire occurs in the intermediate bunker, the flow of the inert gas is increased so that the fire is extinguished. This is effective in preventing the ignition of fire. However, in the closed-type waste incineration processing equipment which is the subject of the present invention, the industrial waste packed in the drum 7 to be processed is not constant, so that the crusher 2 opens the industrial waste in each drum 7. The explosive and flammable gas generated during processing, crushing, and crushing may change discontinuously.
For this reason, it is difficult to detect the concentration of the combustible component in the system and control the supply amount of nitrogen gas, which is an inert gas, according to the detected concentration, as in the technique described in Patent Document 3. Furthermore, the measure of increasing the supply amount of nitrogen gas, which is an inert gas after detecting the occurrence of a fire, is the case where explosive gas is generated from industrial waste packed in the drum 7. There is also a concern that it may become insufficient as a measure for reliably preventing the explosion of the gas.

  Patent Document 4 discloses detection of a gas that causes an explosion in the battery container when the cathode gas or the anode gas leaks from the fuel cell body into the battery container housing the fuel cell body. According to the concentration, it switches the supply stop state and supply state of the inert gas to the battery container. It is valid. However, when supplying the inert gas to the battery container, the inert gas is intermittently supplied as in the inert gas sealing method and apparatus of the sealed waste incineration processing facility of the present invention described later. The idea of doing is not shown at all.

  Therefore, the present invention can prevent the occurrence of fire in the apparatus even in the case of processing drum cans filled with explosive and flammable industrial waste in a sealed waste incineration processing facility. The inert gas of the sealed waste incineration processing equipment that can reduce the consumption of the inert gas when the inert gas is sealed and can reduce the capacity required for the supply source of the inert gas. It is an object of the present invention to provide an encapsulation method and apparatus.

  In order to solve the above problems, the present invention is equipped with a hopper, a crusher, a mixer, a pressure pump, a transport pipe, and an incinerator in order from the upstream side so that the sealed state can be maintained, and various wastes put into the hopper After crushing with a crusher, it is mixed with a mixer to form high-viscosity waste, and the high-viscosity waste is incinerated by being pumped through a transport pipe to an incinerator and incinerated. A closed-type waste incineration facility that intermittently encloses the inert gas when enclosing the inert gas in the system of the incinerator to reduce the oxygen concentration in the system. Inert gas filling method and hopper, crusher, mixer, pressure pump, transport pipe, incinerator in order from the upstream side so that the sealed state can be maintained, and various wastes thrown into the hopper in the crusher After crushing, In a closed-type waste incineration treatment facility in which the high-viscosity waste is mixed into a high-viscosity waste, and the high-viscosity waste is pumped to a incinerator through a transport pipe by a pressure-feed pump and incinerated. A reservoir in which the tip end side of an inert gas sealing tube provided with an on-off valve is connected to a required portion of the intermediate gas, and a base end portion of each inert gas sealing tube is connected to an inert gas supply source An inert gas of a closed waste incineration facility having a configuration that is connected to each tank and further includes a controller that gives an instruction for intermittent opening to the on-off valve on each of the inert gas sealing pipes. A sealing device.

  Furthermore, an oxygen concentration sensor for detecting the oxygen concentration in the facility system is provided at a place where the inert gas is sealed in the system of the sealed waste incineration facility having the above configuration, and the oxygen concentration sensor detects the oxygen concentration sensor. When the oxygen concentration in the equipment system is 4% or more, the controller is provided with a function of giving a command to intermittently open the on-off valve on the inert gas sealing tube.

According to the present invention, the following excellent effects are exhibited.
(1) In order from the upstream side, the hopper, crusher, mixer, pressure pump, transport pipe, and incinerator are prepared so that the sealed state can be maintained, and after crushing various wastes thrown into the hopper with the crusher, the mixer In the system of the closed-type waste incineration equipment that is designed to be mixed with a high-viscosity waste, and the high-viscosity waste is pumped to the incinerator through a transport pipe with a pressure-feed pump and incinerated. An inert gas sealing method for a closed-type waste incineration treatment facility in which an inert gas is intermittently sealed when an inert gas is sealed to lower the oxygen concentration in the system, and upstream In order from the side, the hopper, crusher, mixer, pressure pump, transport pipe, and incinerator are prepared so that the sealed state can be maintained. After crushing the various wastes thrown into the hopper with the crusher, they are mixed with the mixer. High viscosity In a closed-type waste incineration treatment facility where the high-viscosity waste is sent to a incinerator through a transport pipe with a pressure pump and incinerated, it opens and closes at the required part of the facility. A front end side of an inert gas sealing tube provided with a valve, respectively, and a base end portion of each inert gas sealing tube connected to a reservoir tank connected to an inert gas supply source; Since it is an inert gas sealing device of a closed-type waste incineration processing facility having a configuration including a controller that gives a command for intermittent opening to the on-off valve on each of the inert gas sealing tubes, the controller After intermittently opening the on-off valve based on the command from the inside, the inert gas is sealed from the inert gas sealing pipe into the equipment system, and then the sealing of the inert gas is stopped. Open the preceding on-off valve The inert gas sealed in the equipment during operation can be diffused into the equipment system. For this reason, the equipment system can be efficiently used with a small amount of inert gas by alternately filling and diffusing the inert gas. A hypoxic state can be formed inside.
(2) Since the inert gas continuously supplied from the inert gas supply source can be stored in the reservoir tank when the on-off valve on the inert gas sealing pipe is closed, each inert gas is When the open / close valve on the active gas enclosure tube is opened to enclose the nitrogen gas from the respective inert gas enclosure tubes into the equipment system, the inert gas can be enclosed at once. For this reason, it becomes possible to make the capacity | capacitance requested | required of the said inert gas supply source small compared with the past.
(3) An oxygen concentration sensor for detecting the oxygen concentration in the equipment system is provided at a place where an inert gas is sealed in the system of the sealed waste incineration equipment, and the equipment is detected by the oxygen concentration sensor. By configuring the controller to have a function to give an on-off valve on the inert gas sealing pipe to open intermittently when the oxygen concentration in the system is 4% or more, sealed waste When the oxygen concentration in the incineration treatment equipment system is less than 4%, it is possible to stop the filling of the inert gas into the equipment system, so that the consumption of the inert gas can be further reduced. .

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows an embodiment of an inert gas sealing method and apparatus for a sealed waste incineration facility according to the present invention. In the sealed waste incineration facility having the same configuration as that shown in FIG. A reservoir tank 23 is connected to a nitrogen generator 15 as an active gas supply source. As with the nitrogen-filled tube 16 shown in FIG. 2, an inert gas-filled tube with the tip side connected to the required portions (not shown) of the crusher 2, the mixer 3, the interlocking chambers 12 and 14, and other parts of the equipment, respectively. The base ends of the nitrogen-sealed tubes 16a are connected to the reservoir tanks 23, respectively, and an on-off valve 24 is attached in the middle of each nitrogen-sealed tube 16a. Furthermore, an oxygen concentration sensor 25 for detecting the oxygen concentration in the equipment system is provided at a required location of each part of the equipment including at least the vicinity of the crusher 2 (in the case where it is provided near the upstream side of the crusher 2) And a controller for giving an intermittent opening / closing command to the opening / closing valve 24 on each of the nitrogen-sealed tubes 16a based on the detection signal of the oxygen concentration input from the oxygen concentration sensor 25. 26.

  More specifically, when the oxygen concentration detected by the oxygen concentration sensor 25 reaches 4% or more, the controller 26 opens the opening / closing valve 24 on each nitrogen sealing tube 16a at a required time interval. An open / close command is given so as to continue, and the open / close valves 24 can be opened and closed intermittently, for example, alternately repeating an open state for 10 seconds and a closed state for 20 seconds.

  Other configurations are the same as those shown in FIG. 2, and the same components are denoted by the same reference numerals.

  When the inert gas sealing device of the sealed waste incineration processing facility of the present invention is used, the nitrogen generator 15 is continuously operated, and the nitrogen gas 17 is maintained while the on-off valves 24 are closed. To be able to generate.

  In this state, when the sealed waste incineration facility is operated in the same manner as before, if air enters the drum 7 filled with industrial waste together with the industrial waste, As the drum 7 is crushed and the air contained therein is released, the oxygen concentration in the facility system of the sealed waste incineration treatment facility may increase. At this time, if the oxygen concentration sensor 25 detects that the oxygen concentration in the equipment system is 4% or more, the controller 26 opens and closes each nitrogen sealed tube 16a based on the detection signal of the oxygen concentration sensor 25. The intermittent opening / closing command as described above is given to the valve 24. At this time, when the opening / closing valve 24 on each nitrogen enclosure tube 16a is opened, nitrogen gas 17 guided from the nitrogen generator 15 through the reservoir tank 23 to each nitrogen enclosure tube 16a is transferred to each nitrogen enclosure tube. From 16a, the crusher 2, the mixer 3, the interlocking chambers 12 and 14, and other parts of the equipment are sealed. Next, each open / close valve 24 on each nitrogen-filled tube 16a is closed by a command from the controller 26. While each of the on-off valves 24 is closed, that is, when the nitrogen gas 17 is stopped, the nitrogen gas 17 enclosed in the equipment system is diffused in the equipment system when the preceding on-off valve is opened. The While the nitrogen gas 17 is being sealed, the nitrogen gas 17 produced by the nitrogen generator 15 is stored in the reservoir tank 23.

  Thereafter, when the opening / closing valve 24 on each of the nitrogen sealed pipes 16a is opened again according to a command from the controller 26, the nitrogen gas 17 stored in the reservoir tank 23 is immediately installed in each of the nitrogen sealed pipes 16a. Enclosed in the system.

  After that, a small amount of nitrogen gas is obtained by alternately filling the nitrogen gas 17 into the equipment system from each of the nitrogen sealing pipes 16a and diffusing the nitrogen gas 17 into the equipment system while the sealing is stopped. 17, the inside of the equipment system can be efficiently brought into a low oxygen state. The nitrogen gas 17 enclosed in the equipment system in accordance with the intermittent opening / closing operation of the on-off valve 24 on each nitrogen enclosure pipe 16a by the controller 26 is caused by the oxygen concentration in the equipment system detected by the oxygen concentration sensor 25. Continue until less than 4%. For this reason, the inside of the equipment system of the above-mentioned sealed waste incineration processing equipment is always controlled so that the oxygen concentration is less than 4%. Therefore, when the drum can 7 filled with explosive or flammable industrial waste is put into the hopper 1 and crushed by the crusher 2 to be opened, crushed or crushed, Even if flammable gas is generated, explosion and ignition of the gas can be prevented in advance.

  Further, the nitrogen generator 15 continuously produces the nitrogen gas 17, and the nitrogen generator 15 is stopped during the stop of the nitrogen gas 17 closing the on-off valves 24 on the nitrogen sealing pipes 16a. The nitrogen gas 17 produced in the above is stored in the reservoir tank 23, and can be effectively used at the time of nitrogen gas filling when the opening / closing valve 24 on each inert gas sealing pipe 16a is opened. The capacity required for the generator 15 can be reduced as compared with the conventional case.

The present invention is not limited only to the above-described embodiment, and the inert gas to be sealed in the system of the sealed waste incineration processing equipment has been described as using nitrogen gas 17, but the oxygen concentration Is 0 to 1% or so, which is lower than the normal air oxygen concentration of 21%, for example, argon, helium, carbon dioxide, water vapor, or a mixed gas of each other is used. May be. As the nitrogen generator 15 serving as a supply source of the nitrogen gas 17, a pressure swing absorption (PSA) device, a liquid nitrogen tank, or the like can be adopted. Further, as the nitrogen gas supply source, the nitrogen gas 17 is externally supplied. You may make it employ | adopt the pipeline which guides. Similarly, as the supply source of the inert gas other than nitrogen described above, supply of each inert gas from the tank, and when using steam as the inert gas, various boilers are used as the supply source of the steam. Any inert gas supply source may be used as long as the inert gas to be used can be continuously supplied, such as supply from the above. A plurality of oxygen concentration sensors 25 may be provided so that oxygen concentrations at a plurality of locations in the facility system can be detected. The intermittent opening / closing operation of the opening / closing valve 24 on each nitrogen-filled pipe 16a by the controller 26 has been described as being opened for 10 seconds and closed for 20 seconds, but the duration time of opening and closing may be changed respectively. Good. Of course, various changes can be made without departing from the scope of the present invention.

It is a figure which shows the outline | summary of one Embodiment of the inert gas enclosure method and apparatus of the sealed-type waste incineration processing equipment of this invention. It is a figure which shows the outline | summary of the sealed-type waste incineration processing facility used conventionally.

Explanation of symbols

1 Hopper 2 Crusher 3 Mixer 4 Pressure Pump 5 Transport Pipe 6 Incinerator 7 Drum Can (Waste)
9 General waste (waste)
10 High-viscosity waste 15 Nitrogen generator (inert gas supply source)
16a Nitrogen sealed tube (inert gas sealed tube)
23 Reservoir tank 24 On-off valve 25 Oxygen concentration sensor 26 Controller

Claims (3)

  In order from the upstream side, the hopper, crusher, mixer, pressure pump, transport pipe, and incinerator are maintained so that they can be kept in a sealed state, and the various wastes put into the hopper are crushed by the crusher and then mixed by the mixer. Into a high-viscosity waste, and the high-viscosity waste is pumped to a incinerator through a transport pipe with a pressure-feed pump and incinerated. An inert gas sealing method for a closed-type waste incineration treatment facility, wherein the inert gas is intermittently sealed when the inert gas is sealed so as to reduce the oxygen concentration of the waste.   In order from the upstream side, the hopper, crusher, mixer, pressure pump, transport pipe, and incinerator are maintained so that they can be kept sealed. In a sealed waste incineration treatment facility in which the high-viscosity waste is pumped to a incinerator through a transport pipe with a pressure pump and incinerated, In addition, the front end side of the inert gas sealing tube provided with an on-off valve is connected to the middle, and the base end portion of each inert gas sealing tube is connected to the reservoir tank connected to the inert gas supply source. Further, the inertness of the sealed waste incineration facility, characterized in that it has a configuration including a controller for giving a command for intermittent opening to the on-off valve on each of the inert gas sealing pipes. Gas filling device   An oxygen concentration sensor for detecting the oxygen concentration in the facility system is provided at the place where the inert gas is sealed in the system of the sealed waste incineration facility, and the oxygen concentration sensor detected by the oxygen concentration sensor is provided in the facility system. The closed waste incineration facility according to claim 2, wherein the controller is provided with a function of giving a command for intermittent opening to the on-off valve on the inert gas sealing pipe when the oxygen concentration is 4% or more. Inert gas sealing device.

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