PROBLEM TO BE SOLVED: To provide a hydrothermal sterilization method for a multieffect evaporator-type distilled water production system, capable of normally producing distilled water as in the past, and sterilizing a feed-water wetted part within the system with hot liquid in sterilization, by providing a simple additive means.SOLUTION: The multieffect evaporator-type distilled water production system includes: a preheating means of feed water a plurality of evaporators for successively generating pure steam from the preheated feed water a steam-water separation means for the generated pure steam a condenser which cools the pure water subjected to steam-water separation with feed water and cooling water to make distilled water and an outside air introduction means connected to the condenser. The system further includes a hydrothermal sterilization circulating pipe branched from the middle of a pipe connecting a preheater to a first evaporator and returned to the base end of a feed water inlet pipe is provided, so that the feed-water wetted part can be hydrothermally sterilized using the feed water heated by the preheater.COPYRIGHT: (C)2013,JPO&INPIT【課題】簡単な付加的手段を備えることにより、通常は従来のように蒸留水を製造することができ、しかも殺菌時には装置内の供給水接液部を熱水で殺菌することができる多重効用缶式蒸留水製造装置の熱水殺菌方法を提供する。【解決手段】供給水の予熱手段と、予熱した供給水から純蒸気を順次発生させる複数の蒸発缶と、発生させた純蒸気の気水分離手段と、気水分離した純蒸気を供給水及び冷却水で冷却して蒸留水とするコンデンサと、コンデンサに接続された外気導入手段とを備える多重効用缶式蒸留水製造装置において、予熱器と第1蒸発缶とを接続する配管途中から分岐して供給水入口配管の基端部へと戻る熱水殺菌循環配管を設け、予熱器で加熱した供給水を用いて供給水接液部を熱水殺菌出来るようにした。【選択図】図1
