JPH0731278B2 - Method and apparatus for vitrification treatment of radioactive waste liquid - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vitrification treatment method for high-level radioactive liquid waste and an apparatus therefor.

"Prior Art" In recent years, a so-called vitrification treatment method has been devised as one of treatment methods for high-level radioactive waste liquid. This was stabilized by supplying the concentrated high-level radioactive liquid waste and the glass material (borosilicate glass) to a glass melting furnace, which is a kind of electrode furnace, and melting and mixing, and taking out the molten mixture and cooling and solidifying it. It is a form of vitrified body.

In the above case, the glass material is supplied to the glass melting furnace by forming the glass material into a cylindrical glass fiber cartridge and continuously charging it, while the radioactive waste liquid is supplied by the above glass. It is considered to do so by impregnating the fiber cartridge with the waste liquid.

[Problems to be Solved by the Invention] By the way, in the above vitrification treatment method, it is necessary to always keep the amount of glass material and radioactive waste liquid supplied to the glass melting furnace per unit time, and the mixing ratio thereof constant. is important. However, when the glass fiber cartridge is supplied by impregnating the radioactive waste liquid as described above, it is not always easy to keep the supply amount and the mixing ratio constant, and the glass fiber cartridge is supplied. There is a concern that blockage in the pipeline is likely to occur.

This invention has been made in view of the above circumstances, the glass material and the amount of radioactive waste liquid supplied to the glass melting furnace and the mixing ratio thereof, a vitrification treatment method that can easily be kept constant, and therefore The purpose is to provide a device.

"Means for Solving Problems" The glass vitrification treatment method of the present invention is to supply a radioactive waste liquid and a glass material to a glass melting furnace to melt and mix them, and remove the obtained molten mixture from the glass melting furnace. A method for glass-solidifying a radioactive waste liquid to be solidified by supplying the radioactive waste liquid and the glass material to the glass melting furnace, the radioactive waste liquid in a glass container formed into a predetermined standard size by the glass material. It is characterized in that a predetermined amount is injected, and the glass container into which the radioactive waste liquid has been injected is introduced into the glass melting furnace.

Further, the vitrification treatment device of the present invention, a glass melting furnace for heating and melting the radioactive waste liquid together with the glass material,
The glass melting furnace was equipped with a supply means for supplying the radioactive waste liquid and the glass material, and the molten mixture obtained by the glass melting furnace was taken out from the glass melting furnace and solidified. An apparatus for vitrifying a radioactive waste liquid, wherein the supply means arranges a plurality of glass containers each having a predetermined standard size formed by the glass material and into which a predetermined amount of the radioactive waste liquid is injected, at a predetermined interval to melt the glass. It is characterized in that the glass container is transferred to the upper side of the furnace and is introduced into the glass melting furnace from above.

[Operation] In the present invention, the glass material supplied to the glass melting furnace is in the form of a glass container, the radioactive waste liquid is directly injected into the glass container, and the glass container into which the radioactive waste liquid is injected is put into the glass melting furnace. Thus, the glass material and the radioactive waste liquid are simultaneously supplied to the glass melting furnace. Then, the mixing ratio of the glass material and the radioactive liquid waste is set by adjusting the amount of the radioactive liquid waste injected into the glass container in accordance with the amount of the glass material used in the glass container.
Further, the supply amount of the radioactive waste liquid and the glass material is adjusted by adjusting the number of glass containers into which the radioactive waste liquid has been injected into the glass melting furnace.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a schematic configuration diagram showing an embodiment of a vitrification treatment apparatus for radioactive waste liquid according to the present invention, and FIG. 2 is a view showing a raw material M supplied to the vitrification treatment apparatus.

First, the raw material M will be described with reference to FIG. The raw material M is obtained by injecting a predetermined amount of high-level radioactive waste liquid 2 into a beaker-shaped glass container 1 and covering the opening of the glass container 1 with a glass fiber 3. Glass container 1
The glass fiber 3 and the glass fiber 3 are both preliminarily manufactured from a glass material that is a raw material of a vitrified body manufactured by a vitrification treatment device, that is, borosilicate glass, and the dimensions, wall thickness, weight, etc. of each part thereof are constant. It was decided according to the standard.

This raw material M is made into a glass container 1 and its lid (glass fiber 3) in the form of a glass material which has been considered to be supplied to a glass melting furnace in the form of a glass fiber cartridge, and is impregnated in the cartridge. The radioactive waste liquid 2 which was considered to be supplied is directly injected into the glass container 1. Therefore, the mixing ratio of the glass material and the waste liquid to be melt-mixed in the glass melting furnace is naturally determined by the amount of the glass material used in the glass container 1 and the glass fiber 3 and the amount of the waste liquid 2 injected therein. It In other words, the desired mixing ratio can be easily obtained by adjusting the amount of the waste liquid 2 according to the required mixing ratio. Further, the supply amount of the waste liquid and the glass material to the glass melting furnace per unit time can be easily adjusted by adjusting the number of the raw materials M charged into the glass melting furnace.

Next, the configuration of the vitrification treatment apparatus will be described with reference to FIG. This solidification treatment apparatus is a glass melting furnace 10 and a supply means 11 for supplying the raw material M to the glass melting furnace 10.
And are the main components. The glass melting furnace 10 is provided with a raw material supply port 12 and an extraction nozzle 13 at the upper and lower portions, respectively, and a pair of main electrodes 14 and 14 are arranged to face each other on the inner side surface thereof, and a lower electrode 15 is arranged to the bottom surface thereof. The raw material M supplied by the electrodes 14, 14, 15 is heated and melted to form a glass melt, which is taken out from the take-out nozzle 13.

Since each of the electrodes 14, 14 and 15 described above generally has a large capacity and a large amount of heat generation, in order to prevent corrosion and damage of the electrode material, an air-cooling jacket (not shown) for cooling by circulating air inside is used. ) Has been formed. And each of those electrodes
A cooling air pipe line 17 (indicated by a broken line in FIG. 1) for sending the air in the cell in which the vitrification treatment device is arranged into the air cooling jacket by a blower 16 is connected to 14, 14 and 15. At the same time, a preheated air pipe line 18 for connecting the electrodes 14, 14 and 15 to the preheated air chamber 22 (described later) that cools the high temperature air is connected. Also, the glass melting furnace 10
An off-gas discharge conduit 19 for sucking and discharging the off-gas generated inside is connected to the upper part of the.

The raw material supply means 11 is arranged above the glass melting furnace 10. The raw material supply means 11 is a glass melting furnace 10.
The casing 20 forms a raw material transfer passage that is continuous with the raw material supply port 12, and a conveyor 21 that is arranged from outside the casing 20 to above the raw material supply port 12.
A plurality of the raw materials M are arranged on the upper surface of the conveyor 21 at a predetermined interval, and the raw materials M are transferred to the glass melting furnace 10 side continuously or intermittently at a predetermined speed, and the raw material M is supplied to the raw material supply port 12 as well. It is designed to be dropped one by one from above and charged into the glass melting furnace 10.

A preheated air chamber 22 is provided in an upper part of the casing 20, and a nozzle 23 for blowing out preheated air obliquely forward (toward the glass melting furnace 10) is attached to a lower part of the preheated air chamber 22. . Then, the preheated air chamber 22 is connected to the preheated air conduit 18 described above so that the air heated to a high temperature by cooling the electrodes 14, 14, 15 is introduced, and the air is transferred. By spraying on the raw material M therein, the raw material M is preheated to evaporate the water in the radioactive waste liquid 2. The air after preheating the raw material M is the casing as shown by the arrow in the figure.
It flows in the glass melting furnace 10 toward the inside of the glass melting furnace 10.
It is adapted to be discharged from the inside by an off-gas discharge conduit 19.

The configuration of the vitrification treatment apparatus has been described above. Next, a method of using the vitrification treatment apparatus will be described.

First, a predetermined amount of radioactive waste liquid 2 is injected into the glass container 1 by an appropriate injection means, the opening of the glass container 1 is covered with the glass fiber 3, and a large number of raw materials M are prepared. Then, these raw materials M are mounted on the upper surface of the conveyor 21 while being lined up at a predetermined interval, and the conveyor 21 is operated continuously or intermittently at a predetermined speed to transfer the raw materials M, and the raw materials M are transferred one by one. The glass is sequentially charged into the glass melting furnace 10. Alternatively, while the glass containers 1 are lined up on the conveyor 21 and transferred, the waste liquid 2 may be injected along the way. Then, the raw material M charged in the glass melting furnace 10 is charged into the electrodes 14, 14,
It is heated and melted by 15, and the obtained molten glass is taken out from the ejection nozzle 13, poured into a container (not shown) such as a canister, and cooled and solidified to obtain a vitrified body.

Further, when performing the heating and melting by the electrodes 14, 14, 15, while cooling the electrodes 14, 14, 15 by operating the blower 16 to send air through the cooling air pipeline 17, the high temperature after cooling and The resulting air is guided to the preheated air chamber 22 through the preheated air pipe 18, and is blown from the blowing nozzles 23 ...

The transfer speed of the conveyor 21 and the mutual interval between the raw materials M arranged on the conveyor 21 are determined by the required amount of waste liquid and glass material supplied per unit time, the amount of waste liquid 2 per piece of the raw material M, and the glass. Set according to the required number of inputs per unit time calculated from the quantity. Or vice versa
The transfer rate of 21 and the interval between the raw materials M may be appropriately set, and the glass amount and the waste liquid amount per one raw material M may be determined according to the number of the raw materials M charged therein. For example, when the required amounts of waste liquid and glass material supplied per hour are 14.6 / H and 6.6 Kg / H, respectively, and when three raw materials M are supplied per minute (180 per hour), ,
The amount of waste liquid 2 and the amount of glass material of one raw material M should be about 81.1 cc and about 36.7 g, respectively.

As described above, by injecting the radioactive liquid waste 2 into the glass container 1 formed of the glass material and charging it into the glass melting furnace 10, the amount of the liquid waste 2 injected into the glass container 1 can be adjusted. The mixing ratio of the waste liquid and the glass material can be easily adjusted, and the supply amount of both the waste liquid and the glass material to the glass melting furnace 10 can be easily adjusted by adjusting the number of raw materials M charged. It can be carried out. Then, after adjusting them once, the state can be easily maintained, and it is possible to prevent the supply amount and the mixing ratio from varying.

Further, since the raw material M is preheated by utilizing the electrode cooling air, the raw material M can be appropriately evaporated and dried, and the thermal efficiency of the glass melting furnace 10 can be improved. Further, since the glass container 1 of the raw material M is covered with the glass fiber 3, the radioactive waste liquid 2 will not be entrained in the preheated air as a droplet at the time of preheating. When such preheating is performed on the glass fiber cartridge impregnated with the waste liquid, there is a risk that the cartridge becomes viscous at the drying stage and the cartridge cannot be smoothly supplied. However, there is no such fear in the above case,
It is possible to preheat effectively.

In the present invention, the means for preheating the raw material is not necessarily provided if it is unnecessary. Further, the configuration of the raw material supply means is not limited to the use of the conveyor, but can be changed as appropriate according to design requirements and the like.

[Effects of the Invention] As described in detail above, according to the vitrification treatment method of the present invention, a predetermined amount of liquid is injected into a glass container formed of a glass material and the liquid is supplied to a glass melting furnace. Therefore, it is possible to easily adjust the mixing ratio of the waste liquid and the glass material and the supply amount thereof, and it is possible to easily maintain the state after adjusting once, and prevent the fluctuation of the supply amount and the mixing ratio. It is possible.

Further, according to the vitrification treatment apparatus of the present invention, since the raw material, that is, the glass container in which the waste liquid is injected is arranged at a predetermined interval and provided with a supply means for transferring at a predetermined speed, the transfer speed and the mutual interval of the raw materials are adjusted. The amount of raw material input to the glass melting furnace can be easily adjusted, and
It is also easy to prevent the fluctuation, and it is effective for use in carrying out the above method.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a vitrification treatment apparatus according to the present invention, and FIG. 2 is a diagram showing a glass container into which radioactive waste liquid is injected. 1 ... Glass container, 2 ... Radioactive liquid waste, 10 ... Glass melting furnace, 11 ... Supply means.

Claims (2)

[Claims] 1. A method for glass-solidifying a radioactive waste liquid, which comprises supplying a radioactive waste liquid and a glass material to a glass melting furnace, melting and mixing them, and removing the resulting molten mixture from the glass melting furnace to solidify it. Supplying the radioactive waste liquid and the glass material to the glass melting furnace, injecting a predetermined amount of the radioactive waste liquid into a glass container formed into a predetermined standard size by the glass material, the glass into which the radioactive waste liquid has been injected A method for glass-solidifying a radioactive liquid waste, which is carried out by placing a container in the glass melting furnace. 2. A glass melting furnace for heating and melting a radioactive liquid waste together with a glass material, and a supply means for supplying the radioactive liquid waste and the glass material to the glass melting furnace. A vitrification apparatus for radioactive waste liquid, which is configured to take out the molten mixture obtained by a furnace from the glass melting furnace and solidify the molten mixture, wherein the supply means is formed in a predetermined standard size by the glass material and is located inside. A plurality of glass containers into which a fixed amount of the radioactive waste liquid has been injected are arranged at predetermined intervals and transferred to the upper part of the glass melting furnace, and the glass containers are introduced into the glass melting furnace from above. A vitrification treatment device for radioactive waste liquid, which is characterized in that