期刊
DESALINATION
卷 443, 期 -, 页码 110-121出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.desal.2018.05.025
关键词
Vacuum-multi-effect membrane distillation; Seawater desalination; Energy efficiency; Heat recovery; Pilot-scale evaluation
资金
- European Commission under the Switch-Asia project Zero Carbon Resorts [DCI-ASIE/2013/334140]
This work presents the evaluation of an innovative system based on vacuum multi-effect membrane distillation modules (V-MEMD) for seawater desalination at pilot scale. This four-effect unit introduces a remarkable modification from previous V-MEMD systems, consisting of the use of the seawater feed flow as cooling in the condenser, rather than a separate circuit. Preheating the feed in the condenser improved heat efficiency (maximum gained output ratio obtained for seawater was 3.2). Maximum distillate fluxes reached 8.51h(-1)m(-2) for hot feed temperature 75 degrees C and feed flow rate 1501h(-1). Increasing both parameters to raise the productivity was hindered by the inability of the condenser to cope with all the steam generated in previous effects, resulting in overheating and overpressure. Furthermore, a loss of 40% of distillate production was measured due to the increase of seawater cooling temperature by 8 degrees C along the year. Finally, it was observed that scaling reduced distillate production up to 50%. Acid cleaning successfully removed scaling and restored the performance. Subsequently, the use of an antiscalant as a pre-treatment was sufficient to prevent it.
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