This paper presents a detailed thermodynamical exergy analysis of an optimized MSF distillation plant based on the latest published thermodynamics properties of water and seawater software of the Massachusetts Institute of Technology by using design and optimized plant operation data. Exergy flow rates are evaluated throughout the plant and the exergy flow diagram is prepared in both cases. The rates of exergy destruction and their percentages are indicated on the diagram so that the locations of each exergy destruction can easily be identified. The study concludes that as a result of an optimization, making the MSFD unit once-through cooling system to recirculating type by using cooling tower system, the unit's exergy destruction pattern changes meaningfully. Besides, in the three exist thermal desalination plants up to 53 percent of feed water, i.e.; 667 m3/h and the same amount of reject water can be conserved. Though, with this modification, the unit steam consumption has been increased up to 13 ton/h, about 50 percent of design. Moreover, the detail of the study showed that the exergy destruction can be reduced more than 39% in the pumps, and 30% in blowdown and around 29% in distillate streams. For brine heater, an enhance as small as 0.37% is also achieved. In the other hand, the rate of destruction of exergy increased around 25% in the cooling process and above 5% in the evaporators.
[7] Rasoul M.G., Khan M.M.K., Covey D.W., Solar assisted desalination technology, “International Conference and Exhibition on Sustainable Energy Development”, February 2-3, New Delhi, India (2006).
[15] Massachusetts Institute of Technology, Thermophysical Properties of Seawater (Website): Thermophysical properties of Seawater (Accessed April 15, 2016).
Khoshrou, I., Jafari Nasr, M. R., & Bakhtari, K. (2017). Exergy Analysis of the Optimized MSFD Type of Brackish Water Desalination Process. Iranian Journal of Chemistry and Chemical Engineering, 36(6), 191-208. doi: 10.30492/ijcce.2017.24769
MLA
Isa Khoshrou; Mohammad Reza Jafari Nasr; Khosrow Bakhtari. "Exergy Analysis of the Optimized MSFD Type of Brackish Water Desalination Process". Iranian Journal of Chemistry and Chemical Engineering, 36, 6, 2017, 191-208. doi: 10.30492/ijcce.2017.24769
HARVARD
Khoshrou, I., Jafari Nasr, M. R., Bakhtari, K. (2017). 'Exergy Analysis of the Optimized MSFD Type of Brackish Water Desalination Process', Iranian Journal of Chemistry and Chemical Engineering, 36(6), pp. 191-208. doi: 10.30492/ijcce.2017.24769
VANCOUVER
Khoshrou, I., Jafari Nasr, M. R., Bakhtari, K. Exergy Analysis of the Optimized MSFD Type of Brackish Water Desalination Process. Iranian Journal of Chemistry and Chemical Engineering, 2017; 36(6): 191-208. doi: 10.30492/ijcce.2017.24769