화학공학소재연구정보센터
Desalination, Vol.134, No.1-3, 63-76, 2001
Experimental RO facility to study the heating effect of raw water on the varying main parameters
Utilizing power plants in seawater desalination is one of the recent trends to cover the gap between the increasing water demand and the shortage in water resources in the new millenium. The fast development in the reverse osmosis (RO) desalination technique and membrane manufacturing technology renders it one of the promising desalination techniques to be coupled with power plants. Therefore, it is important to study all aspects related to thermal matching between the condenser cooling water outlet and RO system feedwater. in this concern an experimental RO facility was designed for Nuclear Power Plants Authority in Egypt (NPPA) to study the effect of the following parameters on the permeate quality, production, membrane life and aging and system's economy: feedwater temperature; feedwater pressure; recovery ratio. Three types of four-inch diameter spiral wound membranes were selected to carry out the experiments (Fluid Systems, FilmTec and Hydranautics). Based on statistical analysis, five of each membrane type was considered as an optimum sample size. The system design included: 1) Feedwater heating and temperature control facility, consisting of fresh water heater and fresh water to feedwater heat exchanger, in addition to permeate and brine to feedwater heat exchangers to recover its heat content. 2) Feedwater pressure regulating facility, consisting of hydraulic coupling and by pass throttling valve for fine tuning, Beachwells (two) were chosen for raw water feeding to minimize the plant cost and the pretreatment requirements. The control supervisory functions for the plant were designed to be implemented using a distributed control and data acquisition system.