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Mist lift
The Mist lift, Mist flow or Steam lift pump is a gas lift technique of lifting water used in a form of Ocean Thermal Energy Conversion (OTEC) where water falls to operate a hydro-electric turbine. The water is pumped from the level it drops to using rising steam which is combined into a multiphase flow. Independent of energy production, the technique can be used simply as a thermally powered pump used to raise ocean water from depths for unspecified uses.
==Operation==
As in other open cycle OTEC schemes, the technique involves boiling seawater under low atmospheric pressure. The scheme can take many forms so for illustration a particular form will be described and a section below will list details of alternate forms.
The prerequisite for mist lift is that a significant thermal gradient exists. Typically warm surface water is expected to be near . Cold water from depth needs to be in the vicinity of . A common set of embodiments uses a floating concrete vessel most of which is submerged below the surface. Large volumes of warm surface seawater fall by gravity from a substantial height such as to generate electricity from a hydro-electric turbine at the base of the structure. "Mist lift" gets its name by the gas lift technique used to pumped the water back out of the structure. Due to the partial vacuum within the structure, warm sea water from the surface boils, creating large volumes of rising steam. to 20 meters up, jets of cold sea water are sprayed upwards into the vapor, rapidly contracting it and thereby creating significantly lower pressure at the top of the structure than at the base. This causes the multiphase steam-water "mist" to be lifted with great velocity to the top of the structure where it exits.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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