Seawater desalination method, seawater desalination apparatus, and combined power plant using the same

摘要

In the seawater desalination method using the evaporation method, the amount of heat required for heating seawater is reduced. Fresh water obtained by cooling the heat transfer tube 2 in which the seawater flows, the liquid reservoir 3 in which warm seawater warmer than the seawater flows, and the steam evaporated from the warm seawater accumulated in the liquid reservoir 3 with the seawater flowing in the heat transfer tube 2 In a multi-stage flash evaporation type seawater desalination apparatus 101 having a plurality of stages consisting of a small room 1 having a fresh water receiving tray 4 that collects seawater, seawater different from seawater is introduced into the seawater desalination apparatus 101 as the warm seawater. However, the seawater and the warm seawater are configured to flow down in opposition to each other, and the introduction flow rate of the seawater to the seawater desalination device 101 is equal to the introduction flow rate of the warm seawater to the seawater desalination device 101. Or a flow rate adjusting valve 6 for adjusting the flow rate so that the temperature difference between the warm seawater and the seawater is maintained at both ends of the seawater desalination apparatus 101 on the upstream and downstream sides of the seawater flow direction. Heat transfer tube Seawater desalination apparatus being characterized in that provided upstream of the inlet end of the.