The Hygroscopic Cycle was created and developed by Francisco Javier Rubio Serrano in 2008 and is located in the state of the art since 2010, as “Rankine Cycle with absorption step by hygroscopic compounds.” In 2012 IMASA, Engineering and Projects, S.A. (www.imasa.com), acquired the rights to take advantage of the technology. The company’s innovation IBERGY (www.ibergy.com) led by Rubio himself with José Luis Barrientos Reguera and Carlos Pérez Rivero, is developing all the chemical salt studies and the equipment for the benefit of the cycle.
It is a power cycle working with hygroscopic compounds which optimize the output steam of a condensing turbine, and can work under high vacuum at the output thereof and good refrigeration conditions. In short, the condensation temperature at a given pressure in the condenser is increased.
The Hygroscopic Cycle is a power cycle working with water and hygroscopic compounds, which must have the following features:
- They have to be hygroscopic compounds, deliquescent materials.
- Must be less volatile than water and easily separable, that retention may be reversible and the steam can be easily desorbed.
- Must be chemically stable at the pressures and temperatures of steam cycle work to which it will be subjected.
- No toxic or flammable fluids are advised.
The Hygroscopic Cycle incorporates physical and chemical principles of absorption machines with the aim to provide to Rankine cycle higher performance and better cooling. It includes the following main equipment:
- Steam turbine.
- Steam absorber.
- Condensate pump.
- Solution pump.
- Enthalpy recuperator.
- Steam generator.
- Air cooler.
This cycle may include all improvements incorporated into the Rankine cycle (pressure increase start of expansion, the pressure decrease end expansion vapor superheat, reheat, regeneration, supercritical conditions) described in Background´s section.