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3 S-CO2 Compressor Design 3.1 Introduction CO2 compressors are used in many industries, but few applications require operation close to the critical point. Carbon sequestration is one area in the electric power production industry that may spawn interest in S-CO2 compressor design. Presently, however, there is little available information on large-scale S-CO2 compressors operating near the critical point. Modeling of CO2 compressors, especially those operating near the critical point, is important to further development of the recompression cycle. 3.2 Developing Compressors for the S-CO2 Cycle 3.2.1 The Need for a Compressor Model Efforts on the part of Tri Trinh have been directed toward modeling of S-CO2 power conversion systems in transients and tuning controls for the system [Trinh, 2009], but compressor performance in his work was originally based on ideal-gas models adjusted to CO2 densities. The adjustment consists of scaling compressor work inversely with density. The profound changes in fluid properties near the critical point make this approach less than certain. Also, the reductions in compressor work and in turbomachinery size are some of the main advantages of an S-CO2 recompression cycle. These factors demand the development of models to design the compressor for the steady state design point and to model the off-design performance of S-CO2 compressors. Centrifugal compressors are the first choice for the recompression cycle because they are durable, have larger margin to surge than axial compressors, and are expected to perform well based on the operating parameters of the S-CO2 cycle. The Real Gas Radial Compressor (RGRC) code was developed in this work for the purpose of sizing and modeling the performance of S-CO2 centrifugal compressors. 3.2.2 Compressor Background There are many types of industrial compressors, including axial, positive displacement, and centrifugal (a.k.a. radial) compressors. All compressors can be described by a set of non- dimensional numbers. These are specific speed, flow coefficient, and head coefficient [Japikse, 1994]. They are defined as 43PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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