| 摘要 |
PURPOSE:To permit efficient indirect heating of materials to be treated by forming a reacting tower body which constitutes fluidized beds of a waveguide, and absorbing microwaves in the microwave absorbing material provided in the waveguide thereby evolving heat. CONSTITUTION:In the stage of converting raw liquid uranyl nitrate to UO3 by thermal decomposition, UO3 powder is charged beforehand onto a diffusing plate 7 in a waveguide 2 and air is fed from an air supply device 9 to form fluidized beds. Thereafter, a soln. of uranyl nitrate is supplied from a liquid supply device 3 through a supply nozzle 4 and is heated by oscillating a microwave oscillator 1. The soln. of uranyl nitrate sticks on the UO3 powder and is dried by heating and is then denitrated to UO3 powder which is conducted, through a discharge line 8 into a recovering vessel 10. Here, about half of microwave energy is absorbed into the UO3 powder, and the rest is absorbed in a microwave absorbing material 6 to heat the UO3 powder indiectly. The generated steam and gaseous NOx are treated together with the supplied air in a treating device 12 for waste gases. |
