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Waste Heat Recovery with ORC

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Waste Heat Recovery with ORC ( waste-heat-recovery-with-orc )

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1 3 4 5 1 2 3 4 25 6 Pump Recuperator Turbine Generator Evaporator Preheater 6 *Other Siemens ORC-Modules may have other arrangements. Proven Components: The Siemens ORC-Module The ORC-Components Siemens delivers pre-fabricated functional units to the site. Here experienced work teams implement the compo- nents and bring them into service. For each component, Siemens guarantees the highest quality and best service. The ORC- Turbine The SST-060 is a well proven Siemens Turbine and has been installed more than 850 times all over the world. Its rugged design and renowned reliability means it can oper- ate under the most severe conditions. The SST-060 is ideal for saturated steam conditions. Its suitability for use as condensation or back-pressure turbine in combination with various integral gear modules opens up a broad application range. Based on this proven turbine the ORC- Turbine was developed. The Recuperator Siemens delivers a recuperative ORC-Technology. Here, a recuperator is used employing the turbine outlet vapor to heat up the liquid working fluid going via the pre-heater to the evaporator. The recuperator reduces the heat load in the evaporator and increases the thermal efficiency to produce more power. The Working Fluid The working medium indicates optimal characteristics for a working fluid. It is a silicon oil, which is a chlorine free, non-toxic substance with a zero ozone depletion potential. Main characteristics of the working medium: Low freezing point and high temperature stability High heat of vaporization and density Low environmental impact – Ozone depletion potential (ODP) ≤ 0 – No global warming potential Safety – The fluid is non-corrosive, and non-toxic Good availability and low cost The Siemens ORC-Module consists of well proven and long established components. Heat is converted into electricity and at the heart of this conversion process is the turbine. For well over 100 years, steam turbines have been manufactured within the Siemens network. The ORC-Module essentially comprises the turbine (with generator), recuperator with condenser combined in a functional unit, feed pump, pre-heater(s), evaporator and the interconnecting piping. The vapor produced in the evaporator is supplied to the ORC-turbine which drives the generator. After leaving the turbine the vapor enters the recuperator to transfer the energy from the superheated exhaust vapor to the liquid side of the process. Afterwards it is condensed in the condenser. Cooling water supplied by the customer is used for the condensing process. The condensate collected in the condenser hotwell is dis- charged by the feed pump back to the evaporator via the pre-heater(s). The speed of the feed pump is controlled via a frequency converter to maintain the level in the condenser hotwell. For start-up and (emergency) shutdown purposes a bypass system is included. Arrangement Concept Example In below shown example, the base frame connects the evaporator and pre-heaters to one functional unit, whereas the turbine and the generator are on a separate turbine base frame as an extra functional unit. The recu- perator is directly placed on the foundation and the feed pump is located in a separate room or cellar below the ORC-Module. This construction is necessary due to the requirements of the feed pump. Small modules below approx. 700 kW are completely placed on one common base frame.* 67

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