Saving of Energy and Cost in Seawater Desalination With Speed Controlled Pumps
The paper describes for RO, MSF and MED plants the technical arrangement possibilities for speed control systems for small and large pumps and compares the energy consumption with conventional arrangements. It is demonstrated that for RO high pressure pumps speed control results always into an overall cost saving and for thermal desalination plants (MED, MSF) in many cases. Speed control of pumps offers various advantages, i.e. easy fully automatic start-up, easy shut-down, reduced energy consumption as the pump can be operated always at its optimal point without important throttling losses in pressure and flow control valves, longer lifetime of membranes in the case of reverse osmosis due to reduced compaction.