| 摘要 |
PROBLEM TO BE SOLVED: To secure enough heat conductivity even if a temperature difference between a refrigerant and condensible gas is slight, by providing a condensation pipe with a diameter-enlarged part, and also, providing the diameter-enlarged part with a plurality of vertical inner pipes where refrigerant liquid can circulate, in a condenser which is so arranged as to condense the condensable gas having gone up from a distilling column and also as to make the condensed liquid flow back to the distilling column by natural flow down. SOLUTION: A condensation pipe 5 is provided with a diameter-enlarged part 10, and also the diameter-enlarged part is provided with a plurality of vertical inner pipes 11 where refrigerant liquid can circulate. Hereby, an upward stream occurs in the refrigerant liquid within an inner pipe by thermosiphon, and the inner pipe functions as a heat conductive pipe, so a large heat conduction area is secured without increasing the capacity of a condenser so much, thus the heat conductivity can be raised. Especially, if the refrigerant liquid is one which has a boiling point under the condensation point of condensable gas and causes boiling by the heat exchange with the condensable gas, the gas lifting effect to push up the refrigerant liquid within the inner pipe arises, and high heat conductivity can be obtained.
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