Application of advanced exergy analysis for optimizing the design of carbon dioxide pressurization system

Hafiz Ali Muhammad, Beomjoon Lee, Junhyun Cho, Zabdur Rehman, Bongsu Choi, Jongjae Cho, Chulwoo Roh, Gilbong Lee, Muhammad Imran and Young-Jin Baik

Energy, 2021, vol. 228, issue C

Abstract: The pressurization of carbon dioxide is an integral step of the carbon capture and storage process; a key technology frontier for the decarbonization of power and heat industry. Effective measures to improve the pressurization scheme directly translate into the reduction of process costs. This study aimed to reduce the energy expenditure of the carbon dioxide pressurization process by assisting the conventional carbon dioxide multi-stage compressors with an Ammonia (R717) or Propane (R290) based heat-pump system. In these systems, carbon dioxide is liquefied in the heat-pump after being compressed to an intermediate liquefaction pressure. The liquefied carbon dioxide is subsequently pumped to the target pressure. In this study, the advanced exergy analysis, in addition to the conventional energy analysis is applied to design and optimize the carbon dioxide liquefaction system using a heat pump. The initial conventional exergy analysis reveals that 43.76% of total fuel exergy is destroyed and lost. Subsequently, the advanced exergy analysis is performed to pinpoint the source of total irreversibility (exergy destruction), calculate the avoidable exergy destruction in the system and figure out potential measures to improve the system’s performance. The advanced exergy analysis reveals the avoidable exergy destruction is 48.85% and 51.20% of the total exergy destruction for R290 and R717, respectively. Furthermore, the avoidable exogenous exergy destruction is 16% and 19%, respectively. The results also show that for R717, the extent of improvement is in the following order, Condenser > Compressor > Evaporator > Expansion valve. With this information, a systematic approach is devised and followed to optimize the operating parameters and design of the heat-pump system. Furthermore, in the proposed system, 2328.6 kW of exergy is lost to the environment. To recover this exergy loss, the heat pump-assisted pressurization scheme is integrated with a supercritical carbon dioxide power cycle which generated 1191.00 kW of electric power. The results reveal that the electrical power consumed by the proposed system optimized through advanced exergy analysis is 15.5% lower than that consumed by a benchmark system. The study demonstrates the effectiveness of advanced exergy analysis and the approach presented here can be extended to other energy conversion systems to maximize the energy and exergy savings for sustainable development.

Keywords: Advanced exergy analysis; Carbon capture and storage; CO2 pressurization; Heat pump; Supercritical CO2 power cycle (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S036054422100829X
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:energy:v:228:y:2021:i:c:s036054422100829x

DOI: 10.1016/j.energy.2021.120580

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

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