Document Type and Number:
Japanese Patent JPH0585233
Kind Code:
B2
Abstract:
In the distillation of fresh water from sea water, the sea water is passed downwardly in a falling film evaporator through a multiplicity of vertical tube evaporator (VTE) stages and multiple stage flash (MSF) evaporators. After the sea water passes through the first VTE stage where it forms a liquid component and a steam component, the liquid component is distributed evenly into the next VTE stage while the steam component enters an adjoining MSF stage. Condensed fresh water flows downwardly from one MSF stage to the next and experiences flash evaporation. The sea water or brine component and the fresh water distillate flow downwardly through the VTE and MSF stages so that the brine component can be removed from the final VTE stage and the fresh water distillate from the final MSF stage. The steam used to evaporate the sea water flows initially through the first VTE stage and then in combination with the steam component of the sea water through the next MSF stage and then continues alternately through the remaining VTE and MSF stages. Inert gases produced during the stagewise evaporation are removed periodically by suction. In the lower or low pressure VTE stages, for each VTE stage the condensed fresh water distillate is flashed in a plurality of MSF stages. The sea water is preheated before it is introduced into the first VTE stage and the primary steam used for heating the sea water and the steam component of the sea water are passed through the preheater for heating the sea water. The preheater and the VTE stages of the falling film evaporator are formed of stamped heat exchanger parts.
Inventors:
GAAMARU ERU DEIN NATSUSERU
Application Number:
JP13112090A
Publication Date:
December 06, 1993
Filing Date:
May 21, 1990
Export Citation:
Assignee:
FUAU TE BYUURO FUYUA ANBENDONG
International Classes:
B01D1/06; B01D1/22; B01D3/06; C02F1/06; C02F1/04; C02F1/08; E04H5/02; F28D3/00; (IPC1-7): C02F1/04; B01D1/22; C02F1/08