| 摘要 |
<p>A method of drying and powdering liquid radioactive wastes produced in radioactive material treating plants such as nuclear power stations. An apparatus for carrying out the method comprises a vessel having liquid material inlet and outlet ports for liquid wastes, a support plate arranged in the vessel, a great number of spherical bodies piled in layers on the support plate, stirring means having stirring blades for rolling the spherical bodies, and heating means for heating the spherical bodies. An induction heating coil may be used as the heating means, when the spherical bodies are conductive. If electric resistance heating means is used, the spherical bodies are non-conductive. Hot air can be used for heating the spherical bodies. The electric resistance heating means consists of a plurality of resistance heaters one above the other around the vessel so as to be able to control temperature distribution of the piled layers of the spherical bodies to avoid cracking of the spherical bodies due to the temperature difference between the material and the spherical bodies and to completely dry the material, thereby preventing the material from clogging in apertures of the support plate and avoid superfluous heating energy. The support plate is formed with slits concentric to each other and the stirring means is provided with pins rotating therewith and extending into the slits, thereby more positively preventing the material from clogging in the support plate. </p> |
