Economic evaluation of reverse osmosis desalination system coupled with tidal energy

doi:10.1007/s11708-017-0478-2

Front. Energy

2018, Vol. 12

Issue (2) : 297-304 https://doi.org/10.1007/s11708-017-0478-2

RESEARCH ARTICLE

Economic evaluation of reverse osmosis desalination system coupled with tidal energy

Changming LING¹, Yifei WANG¹, Chunhua MIN², Yuwen ZHANG³(

)

¹. College of Mechanical and Power Engineering, Guangdong Ocean University, Zhanjiang 524025, China
². College of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
³. Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, USA

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Abstract

A reverse osmosis (RO) desalination system coupled with tidal energy is proposed. The mechanical energy produced by the tidal energy through hydraulic turbine is directly used to drive the RO unit. The system performances and the water cost of the conventional and tidal energy RO systems are compared. It is found that the proposed tidal energy RO system can save water cost in the range of 31.0%-41.7% in comparison with the conventional RO system. There is an optimum feed pressure that leads to the lowest water cost. The tidal RO system can save more costs at a high feed pressure or a high water recovery rate. The optimum feed pressure of the tidal energy RO system is higher than that of the conventional RO system. The longer lifetime of the tidal energy RO system can save even more water cost. When the site development cost rate is lower than 40%, the water cost of the tidal energy RO system will be lower than that of the conventional RO system. The proposed technology will be an effective alternative desalination method in the future.

Keywords reverse osmosis (RO) desalination tidal energy model economic evaluation

Corresponding Author(s): Yuwen ZHANG

Just Accepted Date: 02 June 2017 Online First Date: 23 June 2017 Issue Date: 04 June 2018

Cite this article:

Changming LING,Yifei WANG,Chunhua MIN, et al. Economic evaluation of reverse osmosis desalination system coupled with tidal energy[J]. Front. Energy, 2018, 12(2): 297-304.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-017-0478-2
https://academic.hep.com.cn/fie/EN/Y2018/V12/I2/297

Fig.1 RO process coupled with tidal energy

Fig.2 Schematic diagram of a membrane module

Fig.3 Schematic view of a pressure vessel with n spiral wound membranes

Tab.1 Performance and operating parameters of the adopted membrane element

Tab.2 Parameters for calculation

Fig.4 Variation of unit water cost with recovery rate at p_f=7.2 MPa and x = 10%

Fig.5 Variation of unit water cost with feed pressure at

ϕ t

= 0.4 and x = 10%

Fig.6 Variation of unit water cost with feed pressure and recovery rate at x = 10%

Fig.7 Cost saving rate with feed pressure at different plant lifetimes

Fig.8 Water cost with recovery rate and the site development cost rate of the tidal energy RO system at p_f=7.2 MPa

A	Membrane pure water permeability/(kg·N⁻¹·s⁻¹)
ACC	Annual capital costs/($·a⁻¹)
AEC	Annual energy cost/($·a⁻¹)
AOC	annual operating costs/($·a⁻¹)
B	Membrane salts permeability/(kg·m⁻²·s⁻¹)
C	Salts concentration/( kg·m⁻³)
C_e	Electricity cost/($·kWh⁻¹)
C_m	Membrane cost/($·m⁻²)
C_pw	Unit product water cost/($·m⁻³)
CC	Capital cost/$
DCC	Direct capital cost/$
F	The plant load factor
i	Interest rate/%
ICC	Indirect capital cost/$
N_m	Number of membrane elements in a PV
N_p	Number of pressure vessels in a plant
n	Plant life/a
OC	Operating cost/$
p	Pressure/Pa
p_m	Membrane replacement rate/a⁻¹
Q	Flow rate/(m³·h⁻¹)
R	Universal gas constant/(J·mol⁻¹·K⁻¹)
r	Salts rejection rate/%
S	Membrane surface area/m²
s	Cost saving rate/%
T	Temperature/K
TCC	Total capital cost/$
x	Site developmentcost rate of DCC for tidal energy RO system/%
Greek symbols
$η$	Efficiency/%
$π$	Osmotic pressure/Pa
$ϕ$	Water recovery rate/%
Superscripts
k	Index of membrane element in the pressure vessel
Subscripts
cr	Conventional RO system
enr	Energy
equip	Equipment
f	Feed water
Hpp	High pressure pump
in	Intake and pretreatment
m	Membrane element
max	Maximum value
p	Product water
pd	Pressure device
pw	Product water
site	Site development
Tb	Hydraulic turbine
t	Total
tr	Tidal energy RO system

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