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Other Recuperator Development • Mini Sector M&P weld joint assessment Compare weld joints prior to thermal exposure • Involute Profile CMM mapping Optimize involute profile to improve interface between core sectors • Weld optimization Vary parameters Inspect through microscopy • 80,000 hour design life of recuperator Primary failure • Creep – function of stress (pressure) and temperature • Oxidation – function of temperature and water content (secondary) Difficulties with long life calculations • Aggressive environment (approaching 1200°F) • Limited material properties available • Recuperator design at Capstone is new Design based on staying within operating environment of current products • Leverage extensive field data Recent assessment of overall life brought into review life expectancies for steady state failure mechanisms • Cyclic life issues being addressed • Steady state concern for 80k hour life due to oxidation • Due to the cost of the recuperator assembly this must meet the 80k hour design target Plan in place to fully assess oxidation life • Recuperator plan details – Accelerated life testing at elevated temperature – Oxidation tests – ORNL (various temperatures, ~4% H2O) 347 (various material thickness) HR-120 347 w/ coating TBD – Evaluate design effort and product cost Reverse recuperator ends to allow hot section first 40k hours in cold side (would limit overhaul options) Material change Reduce cycle temperature – Assessment complete in 6 months – First pilot systems may require recuperator replaced at overhaul • Recuperator manufacturing process developed – Demonstrated ability to produce cores • Recuperator cyclic life is primary technical issue – Primary leak mechanisms were addressed 75PDF Image | Final Technical Report Advanced MicroTurbine System (AMTS) -C200 MicroTurbine -Ultra-Low Emissions MicroTurbine
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