Dynamic modelling and start-up operation of a solar-assisted recompression supercritical CO2 Brayton power cycle

Minh Tri Luu, Dia Milani, Robbie McNaughton and Ali Abbas

Applied Energy, 2017, vol. 199, issue C, 247-263

Abstract: In this paper, we propose and analyse a start-up scheme that can be used to bring a solar-assisted recompression sCO2 Brayton cycle from cold-start to full-load operation (i.e. design point). For this purpose, a comprehensive dynamic model for the entire solar integrated process is developed. It is found that the proposed scheme (consisting of four consecutive operational phases) can successfully bring the cycle to full-load operation in-line with the peak hours of solar energy harvesting. This scheme is featured with the flexibility of using fossil fuel and/or solar energy when appropriate process controls are in place. By utilising the CO2 pressure-temperature-density diagram, an effective strategy is developed and integrated with the start-up scheme for guiding the cycle through the transient period and sustaining the supercritical phase. During full-load operation, there can be unexpected incidents, e.g. loss of charge (LOC). It is found that the LOC event decreases the CO2 cumulative mass of the cycle and consequently reduces the overall solar energy utilization of the system. The sCO2 recompression Brayton cycle intrinsically shows high tolerance to the loss of CO2, thus the supercritical phase can mostly be sustained during a possible LOC event.

Keywords: Supercritical CO2; Brayton cycle; Concentrated solar power; Dynamic; Recompression; Control strategy (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (24)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S030626191730466X
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:199:y:2017:i:c:p:247-263

Ordering information: This journal article can be ordered from
http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/bibliographic
http://www.elsevier. ... 405891/bibliographic

DOI: 10.1016/j.apenergy.2017.04.073

Access Statistics for this article

Applied Energy is currently edited by J. Yan

More articles in Applied Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().