PURPOSE: To provide a flowing liquid film type vaporizer that can also be used in a system in which the supply flow rate is subject to a change by disposing multi-level liquid distribution plates in the shell, and making the liquid supply port to the respective liquid distribution plates increasingly larger toward the lower level.
CONSTITUTION: When the supply rate of to-be-vaporized liquid A is small, such liquid flows down as it forms a desirable liquid film B on the heat transmission pipe 2 from a liquid supply port 3a disposed in a first level liquid distribution plate 4a. When the supply rate of the to-be-vaporized liquid is increased, it overflows from the first level liquid distribution plate 4a to the liquid distribution plate 4b on the following level. Since a liquid supply port 3b larger than that of the upper level is disposed there, the to-be-vaporized liquid flows downward as it forms a desirable liquid film B on the outer surface of the heat transmission pipe 2. Therefore, even if the supply flow rate of the to-be- vaporized liquid changes, a desirable liquid film can always be formed on the heat transmission pipes. Further, when the supply flow rate of the to-be- vaporized liquid is subject to a significant change, the liquid distribution plates might as well as arranged in multi-levels more than three levels.
KOYAMA YOSHIO
ABE NORIMITSU
