JP2545190B2 - Method for treating radioactive waste and apparatus used therefor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for incinerating radioactive activated carbon and other radioactive wastes discharged from radioactive material handling facilities and the like, and an apparatus used therefor.

[0002]

2. Description of the Related Art Conventionally, radioactive waste discharged from radioactive handling facilities and the like has generally been incinerated for volume reduction. FIG. 3 is a diagram showing a configuration of an example of a conventional radioactive waste treatment apparatus. In the example shown in FIG.
Is an incinerator for incinerating radioactive waste, 22 is a preheater for supplying heat when the incinerator 21 is cold, particularly at the start of operation, and 23 is for filtering exhaust gas generated from the incinerator 21. Is a cooler for cooling the exhaust gas passing through the ceramic filter 23, 25 is an exhaust gas filter for further filtering the exhaust gas, and 26 is an exhaust gas blower.

[0003]

According to the treatment apparatus having the above-mentioned configuration, it is possible to incinerate almost all radioactive wastes, and among the radioactive wastes, paper, cloth, wood other than radioactive activated carbon. , PVC and other wastes are crushed as they are, then packed in bags and incinerated in a vertical incinerator.
For example, since the combustion form of granular radioactive activated carbon having a particle size of 1 to 3 mm is mainly surface combustion, it takes time to incinerate the inside, and there is a problem that it is difficult to incinerate due to a short residence time in normal incineration. .

Among radioactive activated carbons, bituminous coal-based and petroleum pitch-based activated carbons are particularly difficult to burn as compared with sawdust-based, coal-based, palm shell-based and palm shell KI-impregnated active carbons. Therefore, it must be packed in a drum, for example, and then stored in a radioactive treatment facility without being reduced in volume, which requires a large amount of space for storage and makes management difficult after storage. was there.

The object of the present invention is to solve the above problems,
It is an object of the present invention to provide a method for treating radioactive activated carbon and other radioactive waste that can achieve volume reduction by incineration of radioactive activated carbon, and an apparatus used therefor.

[0006]

A method for treating radioactive waste according to the present invention is a method for incinerating radioactive activated carbon and other radioactive waste, in which a fine powder of radioactive activated carbon is added to an activated carbon burner in a preheater. The incineration process is performed by the above method, the combustion gas is supplied to an incinerator for other radioactive waste, and the incineration process is performed.

The apparatus used in the method for treating radioactive waste according to the present invention is a preheater for incinerating finely powdered radioactive activated carbon with an activated carbon burner, and the combustion gas thereof is introduced to remove other radioactive waste. It is characterized by comprising an incinerator for incineration.

[0008]

In the above structure, radioactive activated carbon is incinerated by the activated carbon burner in the preheater, and excess air can be supplied compared to combustion in the incinerator, so radioactive activated carbon that is in poor combustion condition can be completely removed. Can be incinerated. For this reason, the ash whose volume has been reduced by the incineration treatment need only be packed in a drum and stored, so that the storage space can be greatly reduced. Further, since the activated carbon burner is attached to the preheater, the amount of auxiliary fuel used in the preheater can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the construction of an example of the radioactive waste processing apparatus of the present invention. In the example shown in FIG. 1, 1
Is an incinerator for incinerating radioactive waste, 2 is a preheater for supplying heat especially when the incinerator 1 is in a cold state at the time of starting operation, and 3 is for filtering exhaust gas generated from the incinerator 1. Ceramic filter, 4 is ceramic filter 3
A cooler for cooling the exhaust gas that has passed through the exhaust gas, an exhaust gas filter 5 for further filtering the exhaust gas, and an exhaust gas blower 6 having the same configuration as the conventional example shown in FIG.

In the present invention, the preheater 2 is provided with an activated carbon burner 7 for incinerating radioactive activated carbon, and an activated carbon crusher 8 and an activated carbon transportation device 9 for supplying a predetermined activated radioactive carbon to the activated carbon burner 7. In addition, an auxiliary fuel tank 10 for incinerating radioactive activated carbon is provided. The activated carbon crusher 8 is for improving the combustion performance by setting the particle size of the radioactive activated carbon to be supplied to the activated carbon burner 7 to 100 μm or less, preferably 75 μm or less, and the activated carbon transporting device 9 indicates that the activated carbon to be transported is radioactive. Since it is tinged, it is preferable to use air transportation.
Combustion in the activated carbon burner 7 can be performed both when combusting the radioactive activated carbon and the auxiliary fuel and when combusting only the auxiliary fuel, and preheating the preheater 2 even when there is no radioactive activated carbon to be incinerated. It is configured to be possible.

According to the treatment apparatus having the above-mentioned structure, prior to incineration of radioactive waste, radioactive activated carbon (all that burns easily and those that do not burn easily) is first processed by the activated carbon pulverizer 8 to have a particle size of 100 μm. The thickness is preferably 75 μm or less. After that, radioactive activated carbon having a predetermined particle size is supplied to the activated carbon burner 7 in the preheater 2 by the activated carbon transport device 9, and the auxiliary fuel is supplied from the auxiliary fuel tank 10 to inject the activated carbon and the auxiliary fuel into the activated carbon burner 7. When activated and ignited, the radioactive activated carbon burns, and the combustion gas is supplied to the incinerator 1 and the incinerator 1
The radioactive waste other than the radioactive activated carbon that was put into the plant is incinerated in the same manner as in the past.

FIG. 2 is a diagram showing the construction of an example of the activated carbon burner in the treatment apparatus of the present invention. In the example shown in FIG. 2, the activated carbon burner 7 has a tubular activated carbon injection pipe 12 having an activated carbon supply port 12a in an inner cylinder of a cylindrical auxiliary fuel injection pipe 11 having an auxiliary combustion supply port 11a. It consists of a structure. The nozzle 13 at the tip of the auxiliary fuel injection pipe 11 and the activated carbon injection pipe 12 are provided on the end surface exposed to the preheater 3.
The nozzle 14 at the tip of the nozzle is provided, and the nozzle 13 and the nozzle 14 are directed toward the direction in which the swirl flow is generated with respect to the axial direction to form a swirl injection part.

With the above-mentioned structure, it is possible to achieve both the case where both the auxiliary fuel and the activated carbon are burned and used as the burner, and the case where only the auxiliary fuel is burned and used as the burner. Among the activated carbons that are hard to burn are petroleum pitch-based and bituminous coal-based activated carbons, and the easily burnable activated carbons are sawdust-based, palm shell-based, palm shell KI-impregnated carbon-based and coal-based active carbons. There is activated carbon.

The present invention is not limited to the above-mentioned embodiments, but various modifications and changes can be made. For example, in the above-mentioned embodiment, all radioactive activated carbon is incinerated by the activated carbon burner, but radioactive activated carbon that is easy to burn is incinerated in the incinerator and other radioactive activated carbon is incinerated by the activated carbon burner. Needless to say, the incineration process can be performed well.

[0015]

As is apparent from the above description, according to the present invention, since the radioactive activated carbon is incinerated by the activated carbon burner, the activated carbon which could not be incinerated up to now can be incinerated. The activated carbon stored in the plant can be treated, and the volume of radioactive waste can be reduced and the storage space can be effectively used. In addition, auxiliary fuel could be reduced by about 70% by using activated carbon.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an example of a radioactive waste treatment device of the present invention.

FIG. 2 is a diagram showing a configuration of an example of an activated carbon burner of the present invention.

FIG. 3 is a diagram showing a configuration of an example of a conventional radioactive waste treatment device.

[Explanation of symbols]

 1 Incinerator 2 Preheater 3 Ceramic filter 4 Cooler 5 Exhaust gas filter 6 Exhaust gas blower 7 Activated carbon burner 8 Activated carbon crusher 9 Activated carbon transport device 10 Auxiliary fuel tank

Claims (2)

(57) [Claims] 1. When incinerating radioactive activated carbon and other radioactive waste, the finely powdered radioactive activated carbon is incinerated by an activated carbon burner in a preheater, and the combustion gas is burned into other radioactive waste. A method for incinerating radioactive waste, which comprises supplying to an incinerator for incineration. 2. A radioactive waste comprising a preheater for incinerating finely powdered radioactive activated carbon with an activated carbon burner, and an incinerator for introducing combustion gas thereof and incinerating other radioactive waste. Equipment for incineration of materials.