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Performance study of a pilot-scale low-temperature multi-effect desalination plant

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  • Qi, Chun-hua
  • Feng, Hou-jun
  • Lv, Qing-chun
  • Xing, Yu-lei
  • Li, Nan

Abstract

A 30t/d low-temperature multi-effect evaporation seawater desalination (LT-MED) system was designed based on the mathematical model, and the corresponding pilot device was constructed in Tianjin, China. Whole-process tests were carried out, and the effects of key operating parameters, including motive steam pressure, maximum operating temperature, temperature difference, spray density, non-condensing gas extraction method, and steam ejector flow, on desalination performance were analyzed. Results showed that the device successfully met product water design requirements; total dissolved solids were less than 5mg/L. Water production initially increased as motive steam pressure increased, then stabilized when pressure exceeded 21% of the design value. Water production reached its maximum when heat transfer temperature difference and spray density ranged from 3°C to 4°C and from 240L/(mh) to 300L/(mh), respectively. Unlike in parallel mode, water production increased by 3.64% when vacuum pumping was operated in series mode. Water production and gain output ratio increased, and system energy consumption reduced when a thermo-vapor compressor was introduced. The results provide a useful reference for the design of other large-scale seawater desalination systems.

Suggested Citation

  • Qi, Chun-hua & Feng, Hou-jun & Lv, Qing-chun & Xing, Yu-lei & Li, Nan, 2014. "Performance study of a pilot-scale low-temperature multi-effect desalination plant," Applied Energy, Elsevier, vol. 135(C), pages 415-422.
    • Handle: RePEc:eee:appene:v:135:y:2014:i:c:p:415-422
    DOI: 10.1016/j.apenergy.2014.08.096
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    References listed on IDEAS

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    1. Ansari, Kambiz & Sayyaadi, Hoseyn & Amidpour, Majid, 2010. "Thermoeconomic optimization of a hybrid pressurized water reactor (PWR) power plant coupled to a multi effect distillation desalination system with thermo-vapor compressor (MED-TVC)," Energy, Elsevier, vol. 35(5), pages 1981-1996.
    2. Sharaf, M.A. & Nafey, A.S. & García-Rodríguez, Lourdes, 2011. "Thermo-economic analysis of solar thermal power cycles assisted MED-VC (multi effect distillation-vapor compression) desalination processes," Energy, Elsevier, vol. 36(5), pages 2753-2764.
    3. Sayyaadi, Hoseyn & Saffari, Arash, 2010. "Thermoeconomic optimization of multi effect distillation desalination systems," Applied Energy, Elsevier, vol. 87(4), pages 1122-1133, April.
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    2. Farzad Hamrang & Afshar Shokri & S. M. Seyed Mahmoudi & Biuk Ehghaghi & Marc A. Rosen, 2020. "Performance Analysis of a New Electricity and Freshwater Production System Based on an Integrated Gasification Combined Cycle and Multi-Effect Desalination," Sustainability, MDPI, vol. 12(19), pages 1-29, September.
    3. Xie, Guo & Sun, Licheng & Mo, Zhengyu & Liu, Hongtao & Du, Min, 2016. "Conceptual design and experimental investigation involving a modular desalination system composed of arrayed tubular solar stills," Applied Energy, Elsevier, vol. 179(C), pages 972-984.

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