Controllability of S-CO2 power system coupled small modular reactor with improved compressor design

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A Supercritical CO2 (S-CO2) power cycle is one of the next generation power conversion cycles, which has many advantages originate from unique fluid's characteristics near the critical point. Recently, a concept of small modular nuclear reactor (SMR) coupled with an S-CO2 power cycle is proposed to target aggressively expanding SMR market. However, many components of S-CO2 power cycle were designed with the experiences from the conventional fluids such as air and water. In this paper, in order to harness the full potential of the S-CO2 power cycle by utilizing the fluid properties further, an S-CO2 compressor with different characteristics from air compressor is evaluated in the viewpoint of system level. The analyzed compressor has a larger backswept angle in the impeller than the conventional compressor and this can be done due to the unique properties of S-CO2. A 10 MW scale SMR is selected to demonstrate the compressor's effect on the system performance and control. As a result, S-CO2 cycle with larger backswept angle compressor can be regulated by inventory control in a wider load variation because the system has low surging mass flow rate. Thus, the system with larger backswept angle compressor has 5.6% wider part-load performance range with inventory control alone than the system with conventional compressor.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2021-06
Language
English
Article Type
Article
Citation

APPLIED THERMAL ENGINEERING, v.192

ISSN
1359-4311
DOI
10.1016/j.applthermaleng.2021.116957
URI
http://hdl.handle.net/10203/285570
Appears in Collection
NE-Journal Papers(저널논문)
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