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Flash evaporators generally use a"once through" system whereby the entire seawater feed is preheated  through the staged  condensers

海水進入condenser 加熱,where 87C vapor condensing into liquid water(distilled water)by giving off its heat to seawater----heat recovery.

and seawater feed heater and allowedto flash down through the stages.

Then heated  seawater feed into evaporators, then flash into vaporbecause of  lower pressure,

 The distilled water was produced at a pressurelower than he vapor pressure of the entering heated seawater.

 The resultant brine from the last stage ispumped overboard.

只有H2O化成vapor,剩下濃度極高的brine 鹽水,排出船外

http://www.merriam-webster.com/dictionary/flash?show=0&t=1389420214

Flash

:  to change suddenly or violently into vapor flashing to steam under reducedpressure>

這個定義就是你要的,例句根本就是為你而寫.

記得初中時就應知道:

1.在平地一個大氣壓14.7psi,水加熱到212F 蒸發成

水蒸氣

2.在高山上,氣壓不足14.7psi,水不到212F度已經開始蒸發

Evaporator 是蒸發器,視使用液體之不同有不同設計,一般就是ㄧ群管組(piping),藉控制seawater (85度 C),和蒸發器內之壓力(低於14.7psi), 降低其沸點而使水蒸發.

http://en.wikipedia.org/wiki/Flash_point

Flash point

The flash point of a volatile material is the lowest temperatureat which it can vaporize to form an ignitable mixture in air. Measuring a flashpoint requires an ignition source. At the flash point, the vapor may cease toburn when the source of ignition is removed

中文翻譯是 “閃點”---以溫度表示

指揮發性物資(一般指燃油)其會汽化產生油氣的最低溫度(與空氣混合後即可燃燒),在該溫度,有火即燃,除去火源,就熄火. 知道閃點,貯存時維持周圍溫度在閃點以下,以策安全

答案是 (1)

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