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Power Generation Operations to date have resulted in turbo-generator power generation up to ~25 kWe at 540°F (282°C) turbine inlet temperature and 55,000 rpm shaft speeds for both the turbo- compressor and turbo-generator. Figure 10 is a data plot of shaft speeds illustrating increase of turbo-generator speed to 55,000rpm followed by progressive increase of turbo- compressor speed to 55,000 rpm. Turbo-generator speed control instability at the end of the data set is due to motor-generator controller issues which are currently being diagnosed. Figure 11 is a data plot of turbo-compressor and turbo-generator electrical power levels illustrating transition of the turbo- generator from motoring (positive power values) to generating (negative power values). Peak turbo-generator power generation of ~25 kWe was achieved in this test. During this test the turbo-compressor was being motored which reduces net Brayton system power output. Figure 12 is a plot of both actual (steady state and transient) and target (steady state) compressor performance plotted on the vendor performance prediction map during power operations. The target compressor performance was developed to provide adequate margin to compressor surge [5-6] during planned operations with the turbo-generator operating at its design speed of 75,000 rpm. As turbo- compressor speed is increased, the enthalpy rise and mass flow rate correspondingly move up and to the right on the performance map. Differences between target and actual compressor performance are expected due to differences in system resistance resulting from the turbo-generator operating at 55,000 rpm for this test. Adequate margin to compressor surge continues to be indicated as compressor speed is increased, further demonstrating successful control system operation. Figure 11: IST Turbomachinery Electrical Power during Power Operations Figure 10: IST Turbomachinery Shaft Speeds during Power Operations Figure 12: IST Turbo-Compressor Performance during Power Operations Figure 13 depicts actual loop heat balance conditions obtained at the maximum power generation point obtained to date. Further increases in power are expected as the IST test program progresses. 5 Copyright © 2013 by ASMEPDF Image | SCO2 BRAYTON CYCLE DEVELOPMENT OVERVIEW
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