| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a vacuum evaporation type desalination plant equipped with an inexpensive and reliable noncondensing gas discharge means to discharge noncondensing gas inside equipment without using a vacuum pump. SOLUTION: In a vacuum evaporation type desalination plant where raw water is heated under reduced pressure directly or indirectly by the heat source, an evaporative distiller 10 is equipped to generate and condense a steam to produce freshwater and a freshwater drain pump 30 is equipped to discharge the produced freshwater, a condensation extraction means (condensation extraction pipe 17 and ejector 23, etc.), to collect the noncondensing gas inside the system and a condensation extraction tank 16 to store the noncondensing gas collected by the condensation extraction means under subatmospheric pressure are installed. The pressurization up to or over atmospheric pressure inside the condensation extraction tank 16 can be performed by the freshwater drain pump 30 and when the noncondensing gas inside the condensation extraction tank 16 is discharged, the inside of the condensation extraction tank 16 is pressurized by the freshwater drain pump 30 and the noncondensing gas is discharged outside the system.</p> |
