A greener seawater desalination method by direct-contact spray evaporation and condensation (DCSEC): Experiments

R. Alrowais, C. Qian, M. Burhan, D. Ybyraiymkul, M.W. Shahzad, K.C. Ng
Applied Thermal Engineering, Volume 179, p. 115629, (2020)

Keywords

Thermally-driven seawater desalination, Direct spray evaporator and condenser design, Multi-stage, Micro-vapor-bubble enhancement

Abstract

​Owing to the high specific energy consumption of conventional seawater desalination methods available hitherto, there is much motivation for designing greener desalination processes. As a greener desalination process, it should consume lower top-brine temperatures for the seawater feed as well as minimum chemical use for brine treatment. In this paper, a direct-contact spray-assisted evaporation and condensation (DCSEC) is presented that addresses the above-mentioned requirements of greener desalination. We have tested both the single-stage and multi-stage configurations of DCSEC process with seawater (3.5% by weight salinity) from Red Sea. The performance of the system was investigated for a feed flow rate of 6 L/minute when the evaporator chamber temperature was varied from 38 °C to 60 °C. From the experiments, maximum distillate production of 31 L/hr m3 was recorded at 60 °C feed temperature for a single-stage configuration. To further enhance the distillate production of DCSEC, an innovative micro/nano-bubbles (M/NBs) generator device is incorporated in the feed supply system which resulted in 34% increase in potable water production at the corresponding inlet feed temperatures.

Code

DOI:10.1016/j.applthermaleng.2020.115629

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