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Siemens and Turboden launch Heat ReCycle water-free combined cycles for distributed energy

Global technology major Siemens AG and Organic Rankine Cycle (ORC) technology major Turboden S.p.A, a subsidiary of Mitsubishi Heavy Industries, have jointly launched Heat ReCycle solution. The combination of a gas turbine power plant with ORC technology to convert waste heat into electricity without using water is a response to the market challenges which various regions of the world are facing today the companies say.

Siemens and Turboden have jointly launched Heat ReCycle. The 3 x SGT-400 Heat ReCycle reference configuration is used as an example for explaining this new power plant in further detail. Having a three-on-one configuration – 3 gas turbines on 1 ORC turbine (yellow) in the typical 50-MW capacity size range enables operational flexibility (graphic courtesy Siemens).

Heat ReCycle allows remote areas to be provided with highly efficient and reliable power generation. Unmanned operation in isolated regions enables deployment in desolate areas, supporting economic growth in these parts of the world.

The growing demand for simple, reliable and water-free of small to medium decentralized power plants can be efficiently satisfied by HeatReCycle solution, said Nicola Rossetti, Sales & Business Development Manager at Turboden.

Through the efficient combustion of fuel, the gas turbine generates electricity and produces hot exhaust gas. The thermal energy in the hot exhaust gas is recovered through a Waste Heat Recovery Unit (WHRU), using an organic fluid as the heat exchange medium. The hot organic fluid is used to power an ORC-turbine and generator to generate additional electricity.

This combined cycle characterizes itself with simplicity compared to a water-/steam-cycle, at the same time completely eliminating the need for water at all.

As the global electricity market is trending towards decentral power generation, this solution offers a great decentral power plant in the range from 10 up to 100 MWe, said Wolfgang Klink, Head of Siemens Heat ReCycle Business.

From an environmental perspective, highly efficient Heat ReCycle Power Plants produce lower emissions when compared to other technology that is typically used in remote areas, like diesel generators and reciprocating engines, resulting in lower NOx, CO2, and lower Unburned Hydro-Carbons (UHC) emissions. Furthermore, Heat ReCycle is a water-free solution a significant consideration in many regions where water is a scarce resource.

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