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Proceedings of the ASME Turbo Expo 2013 GT2013 June 3-7, 2013, San Antonio, Texas, USA GT2013-94268 SUPERCRITICAL CARBON DIOXIDE BRAYTON CYCLE DEVELOPMENT OVERVIEW Kenneth J. Kimball, Kevin D. Rahner, Joseph P. Nehrbauer Bechtel Marine Propulsion Corporation Knolls Atomic Power Laboratory Niskayuna, NY, USA Eric M. Clementoni Bechtel Marine Propulsion Corporation Bettis Atomic Power Laboratory West Mifflin, PA, USA ABSTRACT Bechtel Marine Propulsion Corporation (BMPC) is testing a supercritical carbon dioxide (S-CO2) Brayton system at the Bettis Atomic Power Laboratory. The 100 kWe Integrated System Test (IST) is a two shaft recuperated closed Brayton cycle with a variable speed turbine driven compressor and a constant speed turbine driven generator using S-CO2 as the working fluid. The IST was designed to demonstrate operational, control and performance characteristics of an S- CO2 Brayton power cycle over a wide range of conditions. The IST design includes a comprehensive instrumentation and control system to facilitate precise control of loop operations and to allow detailed evaluation of component and system performance. A detailed dynamic performance model is being used to predict IST performance, support test procedure development and to evaluate test results. An overview of IST testing progress and plans is provided. Testing in the IST was initiated in 2012. Initial test operations included successful system startup, initial transition to electrical power generation and increased power operations using independent speed control of the turbomachinery. Results of testing completed to date and future testing plans will be summarized. INTRODUCTION The S-CO2 Brayton cycle (Figure 1) is being actively developed for potential application in a wide range of energy conversion applications. Figure 1: Temperature-Entropy Diagram for an Example S- CO2 Brayton Loop S-CO2 Brayton system development efforts at BMPC have primarily been focused on system thermodynamics, system control modeling, and the design, construction, and testing of the 100 kWe Integrated System Test (IST) [1-4]. The IST is a simple recuperated closed loop S-CO2 Brayton system with a variable speed turbo-compressor and a constant speed turbo-generator (Figure 2). 1 Copyright © 2013 by ASMEPDF Image | SCO2 BRAYTON CYCLE DEVELOPMENT OVERVIEW
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