熱法による海水濃縮の数値シミュレーション
2003 年 57 巻 5 号 p. 362-367
詳細
2003 年 57 巻 5 号 p. 362-367
A numerical simulation is performed for seawater concentration by thermal evaporation using a multiple effect evaporator in order to investigate its economical feasibility. Amount of required energy is compared with that for the seawater concentration by electrodialysis. The system considered is a series of falling film-long tube vertical evaporators. In the calculations, dependences of various properties on temperature and concentration are considered. In addition to the influences of operating conditions on the process, the effectiveness of waste heat recovery is investigated. The simulation demonstrated that the thermal evaporation under a realistic and reasonable condition requires about 8 times as much energy as the electrodialysis. However, it is also suggested that the thermal evaporation can be comparable when the seawater is concentrated up to 26% and the last two or three stages are used for crystallization.
