The innovation involves a new type of combined steam and gas turbine installation (combined cycle). Current combined cycle installations take a relatively long time to start and are not designed to operate at rapidly changing speeds, let alone give torque to the load when it is standing still. Because of these load characteristics combined cycle installations are very successfully employed in base-load power generation, but are not suitable for flexible electricity production, mechanical drives and maritime propulsion. The innovation involves a combined steam and gas turbine installation (The Rankine Compression Gas turbine or RCG) that returns all shaft power by means of one free power turbine. This means that this combined cycle installation is going to be able to perform electrical peak shaving operations, to operate at rapidly changing speeds and give torque when the load is standing still. For a combined cycle, this is unique. With this new technology, it is  possible to employ combined cycle installations in applications, where they could not have been employed before: MW scale manufacturing industries, mechanical drives and maritime propulsion. The RCG offers a highly flexible electricity supply, while maintaining a steady flow of steam to the manufacturing processes in the factory

 The novelty of the RCG compared to existing combined cycles is, that the steam turbine (ST) drives the compressor (C) of the Gas turbine cycle (Brayton cycle). Hence the name of the Rankine Compression Gas turbine: the compressor of the gas turbine cycle is powered by the steam turbine cycle (Rankine cycle). Otherwise, the RCG comprises the same components as the existing combined cycles. Because the turbine (PT) acts as a free power turbine, it will be able to drive a generator, but also other loads, such as a pump or compressor (mechanical drive applications). To be able start the installation, an auxiliary burner (A) is fitted on the steam generator.


A prototype (500kW thermal power) has been built, to gain experience with the combination of components and to develop an operating strategy. This was done at the University of Technology Eindhoven (the Netherlands), in the lab of the division Thermal Fluids Engineering (faculty Mechanical Engineering). The results show that an RCG-system is well controllable and can be started within minutes. This is very fast for a combined cycle, and is suitable for industrial and maritime applications. With this prototype-skid, Heat Power was able to demonstrate the start-up procedure of the RCG, and how it responds to load-changes. Also the dynamical and start-up behaviour will be further optimized with this prototype. Currently next steps are being undertaken for the realization of a full scale industrial pilot.

In the end of 2016 Heat Power B.V. secured funding from RVO (Dutch government) to demonstrate a RCG system as a small scale industrial pilot at a wood processing plant near Eindhoven. This small scale industrial pilot has been realized in summer 2017 and demonstrates the operation of the RCG in an industrial setting (see picture gallery below). The first full scale commercial plant, with partner ‘Hout Industrie Schijndel’ (HIS), is scheduled for 2018, for which Heat Power B.V. is currently looking into financing partners.



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