Energy and exergy analyses of a Zero emission coal system

Linbo Yan, Boshu He, Xiaohui Pei, Xusheng Li and Chaojun Wang

Energy, 2013, vol. 55, issue C, 1094-1103

Abstract: Energy and exergy analyses are used to evaluate the Zero emission coal (ZEC) system. Energy and exergy losses in each unit of the system are calculated and depicted with Sankey diagrams of energy flow and exergy flow when the system operates at a benchmark condition. Sensitivity analysis is carried out to investigate the effects of different operating parameters including H2 recycling ratio (Rh), calcium to carbon ratio (Rctc) and fuel utilization factor (Uf) on the energy efficiency (Een), exergy efficiency (Eex), total energy efficiency (Eten), total exergy efficiency (Etex) and carbon dioxide (CO2) sequestration ratio (Rcs) of this system. The energy loss in the steam turbine (ST) is 35.2% which is the maximum among all the units and the maximum exergy loss of 37.0% occurs in the solid oxide fuel cell (SOFC). Rh at 0.75 and Uf at 0.8 are recommended as the optimum operation parameters of the system based on the sensitivity analysis. Rcs increases with increasing Rctc. Rctc at 1.5 is recommended to maintain a high CO2 sequestration ratio with acceptable economic penalty. With these optimized parameters, Een of 36.2%, Eten of 46.8%, Eex of 35.7%, Etex of 46.2% and Rcs of 87.4% can be achieved by the proposed system.

Keywords: Energy; Exergy; Zero emission coal (ZEC); Hydrogasification; Reformer; Solid oxide fuel cell (SOFC) (search for similar items in EconPapers)
Date: 2013
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Citations: View citations in EconPapers (14)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:55:y:2013:i:c:p:1094-1103

DOI: 10.1016/j.energy.2013.04.006

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