(691a) Theoretical Investigation of Power Generation By Pressure Retarded Osmosis
AIChE Annual Meeting
2017
2017 Annual Meeting
Separations Division
Water Treatment, Desalination, and Reuse IV
Thursday, November 2, 2017 - 8:00am to 8:25am
This work presents a systematic method for analysis and optimization of specific energy production (SEP) of PRO systems employing single-stage configuration as well as multi-stage design with inter-stage hydro-turbines. It is shown that the SEP normalized by the draw solution feed osmotic pressure increases with the number of stages as well as a dimensionless parameter Î¥total = AtotalLpÏ0/Q0. As compared to the single-stage PRO, the multi-stage arrangement not only increases flux and volume gain, but also allows a stage-dependent, progressively decreasing hydraulic pressure, both of which contribute to enhanced SEP and power density. At the thermodynamic limit where Î¥total goes to infinity, the theoretical maximum SEP that can be recovered by an N-stage PRO system is derived analytically. For single-stage PRO, it is no more than Ï0. For infinite number of stages, the theoretical limit becomes ln(qtotal)Ï0, where qtotalis the dilution ratio. The gap between SEP under practical conditions and its theoretical value is discussed.
Reference:
[1] M. Li. Theoretical Investigation of Power Generation by Pressure Retarded Osmosis. Under Review, 2017.
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