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Title: Recompression Closed Brayton Cycle Control Options Nuclear Science

Abstract

The attractive performance of the S-CO 2 recompression cycle arises from the thermo-physical properties of carbon dioxide near the critical point. However, to ensure efficient operation of the cycle near the critical point, precise control of the heat removal rate by the pre-cooler upstream of the main compressor is required. With respect to the S-CO 2 recompression cycle at SNL, presently an operator is tasked with manually adjusting the opening of the valve that governs the water flow rate through the pre-cooler. This report describes a procedure to design an automatic controller that uses the water flow rate as a controlling variable to regulate the S-CO 2 temperature at the pre-cooler outlet. The work relies on the GPASS control-oriented model of the pre-cooler developed last year. A model-based approach is used to design a PI (Proportional-Integral) controller. Then a transfer function describing the influence of the water flow rate on the S-CO 2 outlet temperature is derived from the pre-cooler model. Suitable values for the controller gains are then derived and finally the gains are tested on the initial time-discrete non-linear model.

Authors:
 [1];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1483846
Report Number(s):
ANL-ART-147
146839
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS

Citation Formats

Ponciroli, R., and Vilim, R. B. Recompression Closed Brayton Cycle Control Options Nuclear Science. United States: N. p., 2018. Web. doi:10.2172/1483846.
Ponciroli, R., & Vilim, R. B. Recompression Closed Brayton Cycle Control Options Nuclear Science. United States. doi:10.2172/1483846.
Ponciroli, R., and Vilim, R. B. Fri . "Recompression Closed Brayton Cycle Control Options Nuclear Science". United States. doi:10.2172/1483846. https://www.osti.gov/servlets/purl/1483846.
@article{osti_1483846,
title = {Recompression Closed Brayton Cycle Control Options Nuclear Science},
author = {Ponciroli, R. and Vilim, R. B.},
abstractNote = {The attractive performance of the S-CO2 recompression cycle arises from the thermo-physical properties of carbon dioxide near the critical point. However, to ensure efficient operation of the cycle near the critical point, precise control of the heat removal rate by the pre-cooler upstream of the main compressor is required. With respect to the S-CO2 recompression cycle at SNL, presently an operator is tasked with manually adjusting the opening of the valve that governs the water flow rate through the pre-cooler. This report describes a procedure to design an automatic controller that uses the water flow rate as a controlling variable to regulate the S-CO2 temperature at the pre-cooler outlet. The work relies on the GPASS control-oriented model of the pre-cooler developed last year. A model-based approach is used to design a PI (Proportional-Integral) controller. Then a transfer function describing the influence of the water flow rate on the S-CO2 outlet temperature is derived from the pre-cooler model. Suitable values for the controller gains are then derived and finally the gains are tested on the initial time-discrete non-linear model.},
doi = {10.2172/1483846},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {8}
}

Technical Report:

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