JP4931453B2 - Method and apparatus for cooling molten waste - Google Patents

Description

  The present invention relates to a cooling method and a cooling apparatus for molten waste produced by melting waste in a melting furnace.

  Of the low-level radioactive waste generated at nuclear power plants, miscellaneous solid waste is packed in drums, filled with mortar and other fillers, and disposed of in a predetermined burial site. Therefore, it is preferable to reduce the volume of miscellaneous solid waste and reduce the number of embedded drums. Therefore, as a method for reducing the volume of miscellaneous solid waste, for example, melting equipment using a high frequency induction heating method has been introduced.

  The miscellaneous solid waste is melted in the canister set in the melting furnace of the melting facility and reduced in volume to become molten waste. The molten waste is extracted from the melting furnace together with the canister and transferred to the cooling chamber by the canister moving device. It is carried out and solidified by blowing cold air in the cooling chamber.

  Although the temperature of the molten waste at the time of extracting from the melting furnace is about 1500 ° C., the molten waste is cooled to about 90 ° C. in the cooling chamber and taken out to the molten waste filling station.

  Then, the molten waste is accommodated in a drum can at a molten waste filling place and carried out to a mortar filling and solidifying facility.

  However, in the conventional cooling method using only the cooling chamber, if the cooling capacity of the cold air supply device decreases due to an increase in the outside air temperature such as in summer, it takes a long time to cool the molten waste. If the time cannot be taken out and the cooling time becomes longer than the melting time, the cooling chamber becomes full. When the cooling chamber is full, new molten waste can no longer be received, and the expected delivery time when the most cooled molten waste is being cooled is expected to reach approximately 90 ° C. When the time is later than the scheduled time, there is a problem that the melting furnace has to be stopped.

  Further, when the melting furnace is stopped, the operation rate of the melting furnace is lowered.

  Therefore, the present invention solves the above-mentioned problems, and the object of the present invention is to always accept the molten waste transported from the melting furnace into the cooling chamber by using the molten waste cooling method and cooling device according to the present invention. Thus, the present invention provides a cooling method and a cooling device for molten waste that improve the operating rate of a melting furnace.

In order to solve the above-described problem, the molten waste cooling method of the present invention is such that the object to be melted is melted in a canister set in the melting furnace, and the generated molten waste is extracted from the melting furnace together with the canister. A molten waste cooling method for cooling the molten waste together with a canister, wherein a plurality of molten wastes extracted from the melting furnace are placed in a cooling chamber capable of simultaneously cooling a plurality of molten wastes together with a canister and a plurality of molten wastes together with a canister. When the molten waste is carried in, the cold air is introduced into the cooling chamber, the molten waste is cooled by the cold air, and new molten waste is carried from the melting furnace while the cooling chamber is full. the molten waste, which is conveyed into the cooling chamber at the earliest time among the molten waste, even the molten waste does not reach below 100 ° C. unloading possible temperature is unloaded from the cooling chamber, communicating with the cooling chamber Carried into the molten waste Load Master guides the outside air into the molten waste in Load Master, the by external air melted waste again, characterized by cooling.

In the molten waste cooling system of the present invention, the melting object is melted in a canister set in the melting furnace, the generated molten waste is extracted from the melting furnace together with the canister, and the molten waste is removed. A cooling system for molten waste that cools the entire canister, the cooling chamber capable of simultaneously cooling a plurality of molten wastes together with the canister, and cooling air is supplied into the cooling chamber, and then sequentially transferred from the melting furnace into the cooling chamber. a first cooling device for simultaneously cooling each canister a plurality of molten waste, which is, while being continuously to the cooling chamber, and the molten waste Load Master receiving said molten waste is unloaded from the cooling chamber, the molten leading the outside air into the waste Load Master, the molten waste Load Master in the cooling chamber loaded therein said molten waste again, a second cooling device for cooling, and cooled in the second cooling device Said molten waste clamps each canister, is carried out from the molten waste Load Master, the molten waste and a mobile device provided with a clamp having a clampable heat temperature for each canister, said cooling chamber the molten The molten waste carried into the cooling chamber at the earliest time among the molten waste being cooled in the cooling chamber when new molten waste is carried from the melting furnace in a state full of waste. Even if the material does not reach the temperature at which the molten waste can be carried out below 100 ° C., it is carried out from the cooling chamber and carried into the molten waste filling station .

  According to the present invention, the molten waste carried out of the melting furnace can be always received in the cooling chamber, and the operating rate of the melting furnace can be improved.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an overall configuration of a radioactive waste treatment facility according to an embodiment of the present invention. As shown in FIG. 1, a miscellaneous solid waste melting facility includes a pretreatment facility 1 for sorting miscellaneous solid waste, and a melting facility 2 for melting fusible waste among the sorted miscellaneous solid waste. And a mortar solidification facility 3 in which a drum can containing molten waste after completion of melting is filled with mortar to form a solidified solid body, and a storage facility 4 for temporarily storing the solidified solidified body.

  In the pretreatment facility 1, miscellaneous solid wastes of low-level radioactive wastes with different types of properties (materials, dimensions, shapes, etc.) generated in nuclear power generation facilities are unprocessed wastes 6, direct packing 7 The molten object 8 is divided into three sections.

  The object to be melted 8 is melted in the canister 12 set in the melting furnace 21 of the melting facility 2 and reduced in volume to become a molten waste 31. The molten waste 31 is melted together with the canister 12 by the canister moving device 23. It is extracted from 21 and carried out to the cooling chamber 22.

FIG. 2 is a diagram illustrating movement of molten waste from a melting furnace to a molten waste filling station according to an embodiment of the present invention. As shown in FIG. 2, the cooling chamber 22 includes a cold air supply device 70 as a first cooling device that supplies cold air, and can cool three molten wastes 31 a, 31 b, and 31 c at the same time.

  In the summer, etc., the cooling capacity of the cold air supply device 70 decreases due to the rise in the outside air temperature, and it takes a long time to cool the molten waste 31. The molten waste 31 cannot be carried out from the cooling room for a long time, and the cooling time is melted. If it becomes longer than time, the cooling chamber 22 will be full.

Therefore, when a new molten waste 31d is carried in from the melting furnace 21 with the cooling chamber 22 being full, the molten waste 31 being cooled was carried into the cooling chamber 22 at the earliest time. For example, the molten waste 31a is carried out to the molten waste filling station 38 in the next step without reaching the final cooling temperature of 100 ° C. (this temperature will be described later) that can be carried out . Then, the molten waste 31 d is carried into the cooling chamber 22.
Using the Newton's cooling law that the amount of heat release is proportional to the temperature difference between the molten waste 31 and the cold air, the molten waste 31d having the largest temperature difference from the cold air is preferentially cooled in the cooling chamber 22 . . And the molten waste 31a carried into the molten waste filling place 38 is again cooled by the cooling device 71 as the second cooling device .

  Here, in the case where the molten waste 31a is cooled using the molten waste filling station 38, the time when the molten waste 31a is cooled to less than 100 ° C. is the molten waste next carried out from the melting furnace. The knowledge that it is sufficiently earlier than the melting end time 31 is obtained, and only one cooling device 71 in the molten waste filling station 38 is required.

  FIG. 3 is a diagram showing a cooling device and a moving device in the molten waste filling station according to one embodiment of the present invention. As shown in FIG. 3, the cooling device 71 includes a blower 72 that supplies outside air, a bellows-like duct 73 that can extend and move, guides the outside air supplied from the blower 72 to the molten waste 31 a, and a canister 12 includes a clamp 75 with a slip stopper 74 that holds the molten waste 31a accommodated in the canister 12 together with a canister 12, and a moving device 76 that moves to the drum can installation location to pack the sandwiched molten waste 31a into the drum can.

  The duct 73 is cooled by directing the opening of the duct 73 toward the canister 12 and blowing the outside air directly onto the molten waste 31a in the canister 12.

  And after the molten waste 31a is cooled to less than 100 degreeC, the canister 12 is clamped with the clamp 75 with a slip stopper 74. FIG. Here, since the anti-slip 74 of the clamp 75 is made of silicon rubber having a heat resistant temperature of about 200 ° C., the final cooling end temperature of the molten waste 31a is set to less than 100 ° C.

  The molten waste 31a that has been cooled is sandwiched between clamps 75, accommodated together with the canister 12 in the drum can 32 by the moving device 76, and carried out to the mortar solidification facility 3 by a drum can carry-out device (not shown).

  For the convenience of understanding the invention, in the present embodiment, the number of the molten waste 31 to be cooled in the cooling device 22 is three. However, the number of the molten waste 31 is not limited to the number according to the present invention. It can be changed as appropriate by introducing a high cold air device. In the present embodiment, the number of the cooling devices 71 in the molten waste filling station 38 is one. However, the number of the cooling devices 71 is not limited to the number according to the present invention. Is possible.

  Therefore, the molten waste carried out from the melting furnace can always be received in the cooling chamber, and the operating rate of the melting furnace can be improved.

It is a figure which shows the whole structure of the radioactive waste processing equipment which concerns on one Embodiment of this invention. It is a figure which shows the movement of the molten waste from the melting furnace which concerns on one Embodiment of this invention to a molten waste filling place. It is a figure which shows the cooling device and movement apparatus in the molten waste filling place which concern on one Embodiment of this invention.

Explanation of symbols

2 Melting equipment 4 Storage equipment 12 Canister 21 Melting furnace 22 Cooling device 23 Moving device 31 (31a, 31b, 31c, 31d) Melting waste 38 Melting waste filling place 70 Cold air supply device 71 Cooling device 72 Blower 73 Duct 74 Non-slip 75 Clamp 76 moving device

Claims (2)

A melting waste cooling method in which a melting object is melted in a canister set in a melting furnace, the generated molten waste is extracted from the melting furnace together with the canister, and the molten waste is cooled together with the canister. ,
A plurality of molten wastes extracted from the melting furnace are transferred to a canister, and a plurality of molten wastes are simultaneously transferred to a cooling chamber capable of cooling the entire canisters,
When cold air is introduced into the cooling chamber, the molten waste is cooled by the cold air, and new molten waste is carried from the melting furnace in a state where the cooling chamber is full, the molten waste being cooled Of the molten waste carried into the cooling chamber at the earliest time, the molten waste is carried out from the cooling chamber without reaching the temperature at which the molten waste can be carried out less than 100 ° C., and connected to the cooling chamber. A method for cooling a molten waste , which is carried into a packing place, directs outside air into the melting waste filling place, and the molten waste is cooled again by the outside air . A melting waste cooling system for melting an object to be melted in a canister set in a melting furnace, extracting the generated molten waste together with the canister from the melting furnace, and cooling the molten waste together with the canister. ,
A cooling chamber capable of simultaneously cooling a plurality of molten wastes together with a canister, and supplying cooling air to the cooling chamber, and cooling the plurality of molten wastes sequentially transferred from the melting furnace into the cooling chamber simultaneously with the canisters . 1 cooling device ;
Together provided continuously to the cooling chamber, and the molten waste Load Master receiving said molten waste is unloaded from the cooling chamber,
A second cooling device that guides the outside air into the molten waste filling place and cools again the molten waste carried from the cooling chamber into the molten waste filling place;
A moving device including a clamp having a heat-resistant temperature at which the molten waste cooled by the second cooling device is clamped together with the canister and transported from the molten waste filling station, and the molten waste can be clamped together with the canister. Prepared,
When a new molten waste is carried from the melting furnace while the cooling chamber is full of the molten waste, the cooling chamber enters the cooling chamber at the earliest time among the molten waste that is being cooled in the cooling chamber. The molten waste is carried out from the cooling chamber and carried into the molten waste stuffing station without reaching the molten waste at a temperature lower than 100 ° C. at which the molten waste can be carried out . Cooling system.

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