On interim-test equipment of sea-water desalination using low-temperature and multi-effect distillation(LT-MED) with output capacity of 25-thousand t/d

through changing the technological parameters

the influence of working temperature in operation of equipment

technological process

arrangement of heat-exchaning pipes in the evaporater

flow rate of material and sea-water

and degree of over cooling upon the output of fresh water has been investigated.Results show that the water yield under condition of low temperature and two-effect mode is only 50%~70% of that in high-temperature and two-effect mode;suitably preheating material and sea-water is advantageous to enhance the work efficiency of the evaporator;the declination arrangement of heat-exchanging pipes hasn't substantial effectiveness for enhancing the heat-exchanging in evaporator;increasing the spray amount of material and sea-water will decrease the output of fresh water and the water-making ratio;and the spraying density is adequate to maintain in a range of 0.04~0.06 kg/ms.