Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : June 17, 2024 - June 18, 2024
To achieve decommissioning, drying of wet absorbent in containers for contaminated water treatment is considered to be effective in preventing dose leakage due to water leakage. Therefore, vacuum drying by heating from the side of the container is being considered, and it is very important to evaluate the feasibility and drying time in advance. However, absorbent is porous, and it is difficult to clarify the physical phenomenon because it is a very complex phase change that occurs in a system in which water and vapor exist between the absorbent particles and the inside of the pores. In this study, we designed and fabricated a vacuum drying apparatus for wet absorbent in a half-height container of actual diameter, in order to evaluate the drying method. The apparatus consists of a cylindrical container with a torus drainage tube at the bottom, an outer cylinder with a heater installed on its outer surface, a temperature controller, 39 thermocouples, a condenser, a condensate tank, a water level gauge, a vacuum pump, and a computer for data input. After each test, mass ratios of water content to absorbent were measured by sampling the absorbent to confirm that the lower part of the torus drain pipe was also dry. In addition, we tried to demonstrate the possibility of determining the end of drying by using the rate of change in the temperature of the outer wall of the container over time as a parameter.
