| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an evaporation can and an operational method of the evaporation can capable of restraining excessive corrosion of a can wall, for continuing concentration operation without reducing concentration efficiency, even when an impurity deposits in a bottom part of the evaporation can.SOLUTION: The operational method of the evaporation can comprises a solution supply part 11 for supplying a solution to the evaporation can 1, a flow control part 8 for controlling a flow rate of the solution supplied to the evaporation can 1, a heating source 9 for concentration operation by heating the solution inside of the evaporation can 1 and a liquid level measuring part 10 for measuring a liquid level (h) of the solution inside of the evaporation can 1. The flow control part 8 controls the flow rate of the solution supplied to the evaporation can 1 by determining an upper limit value of the liquid level (h) with which a saturation temperature in a bottom part of the evaporation can 1 becomes smaller than a limit temperature from the predetermined limit temperature, atmospheric pressure (p) in concentration operation and the saturation temperature of the solution depending on the liquid level (h) and the atmospheric pressure (p) so that the liquid level (h) becomes smaller than the upper limit value in concentration operation.</p> |
