Turboden CHP HR ORC room example

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Turboden CHP HR ORC room example ( turboden-chp-hr-orc-room-example )

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Challenges of Existing Non-Hermetic ORC Systems  Shaft seals  Generally accepted to be the least reliable component in rotating machinery  Working fluid leakage is expensive • Possibility of fire with flammable refrigerants • Must measure and log refrigerant levels • Leaked refrigerant replacement is expensive  Requires shaft seal pressure control system, temperature monitors, leak monitors, etc.  High inspection and maintenance costs; periodic seal replacement  Mechanical losses: 1–2%  Gearbox  Inspection and maintenance costs  Mechanical losses: ≈4%  Couplings  Inspection and maintenance costs  Lubricated bearings  Mechanical losses: ≈2%  Requires oil system  High-speed lubricated bearings have rotordynamics complications ASME ORC 2013 © 2013 Concepts ETI, Inc. All rights reserved.  Oil systems  Use of oil limits the maximum temperature of the heat source • High temperatures degrade oil • Limits applicability of ORC technology  Requires oil separator, filter, strainer, and cooler  Requires periodic oil filter and strainer changes  Parasitic power losses: ≈2%  High maintenance issues and costs • Must measure and log oil levels • Periodic oil additions and changes • Periodic oil sampling and analysis (moisture, acidity, and metal content)  Instrumentation  Separate vibration probes and proximity sensors are usually required to monitor turbine and/or gearbox shaft vibration levels on high-speed rotary shafts  Turbine matching  Standardized turbine designs of many ORC systems are a poor match for many applications 2

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