Solar plant valve automation includes retrofit upgrade
Published: 11 January 2012 - Heather Ramsden
Rotork IQ intelligent electric valve actuators with Rotork Pakscan two-wire digital control systems are in use at Spanish solar energy plant La Dehesa and La Florida in the state of Badajoz.
Rotork Iberia has worked with the plants’ owner, RenovablesSAMCA, to integrate an economical and efficient IQPro actuation and control system.
Rotork’s Pakscan P3 control system was chosen for its long range bus capabilities and cost savings. Each Pakscan P3 master station is said to operate a bus loop of up to 20km with no deterioration in communication performance or the need for repeaters, making it suiable for the spacious environment of a solar power plant. Rotork is now on site for a retrofit on the plants’ HTF (Heat Transfer Fluid) pipework. The HTF pipes carry the heat transfer oil between the parabolic mirrors, the steam plant and the power generation circuits. At each site Rotork is installing 168 actuators and four Pakscan P3 master stations for the automation of three inch globe valves, to introduce remote control of the HTF temperature.
Rotork is supplying a linear version of the IQTF multi-turn actuator to provide precise remote control of the HTF temperature. Data loggers within the IQTF units facilitate valve diagnostics by recording historical data and valve torque trends.