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Research Papers

Design and Balance-of-Plant of a Demonstration Plant With a Solid Oxide Fuel Cell Fed by Biogas From Waste-Water and Exhaust Carbon Recycling for Algae Growth

[+] Author and Article Information
Marta Gandiglio

Politecnico di Torino,
Corso Duca degli Abruzzi,
Torino 24-10129, Italy
e-mail: marta.gandiglio@polito.it

Andrea Lanzini

Politecnico di Torino,
Corso Duca degli Abruzzi,
Torino 24-10129, Italy
e-mail: andrea.lanzini@polito.it

Massimo Santarelli

Politecnico di Torino,
Corso Duca degli Abruzzi,
Torino 24-10129, Italy
e-mail: massimo.santarelli@polito.it

Pierluigi Leone

Politecnico di Torino,
Corso Duca degli Abruzzi,
Torino 24-10129, Italy
e-mail: pierluigi.leone@polito.it

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received November 18, 2013; final manuscript received November 19, 2013; published online January 2, 2014. Editor: Nigel M. Sammes.

J. Fuel Cell Sci. Technol 11(3), 031003 (Jan 02, 2014) (13 pages) Paper No: FC-13-1109; doi: 10.1115/1.4026088 History: Received November 18, 2013; Revised November 19, 2013

The design and balance-of-plant of a novel anaerobic digestion (AD) biogas solid oxide fuel cell (SOFC) plant is assessed. Biogas from waste-water treatment plant is the fuel feeding the SOFC system. Simultaneous multigeneration of electricity, heat and a fuel (algae, in our case) via exhaust carbon recycling is accomplished in the proposed plant configuration. CO2 capture from the SOFC anode exhaust is carried out through an oxy-combustion reactor that completes the oxidation of spent fuel still available downstream of the fuel cell. The captured CO2, after water condensation, is thus fed to an array of photo-bioreactors where C biofixation in algae is achieved. The design of the main plant sections, including the gas cleaning unit, fuel processor, SOFC “hot-box,” oxy-combustor, CO2/H2O condensation unit and photo-bioreactors, is provided. A system analysis of a full-scale version of the biogas SOFC power plant with optimized heat integration is finally analyzed to fully understand the potential of the proposed integrated energy system. An overall electrical efficiency exceeding 52% (LHV basis) was calculated. Sensitivity analyses have been carried out in order to study the influence of fuel utilization, internal reforming, biogas composition and steam-to-carbon ratio on both SOFC and overall plant performance.

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References

Figures

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Fig. 1

F1SMAT waste water treatment plant in Torino, IT (courtesy of SMAT S.p.a. http://www.smatorino.it/)

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Fig. 2

Demonstration plant section subdivision

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Fig. 3

Total sulfur concentration in digester CA 3033 N

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Fig. 4

Total chosen compounds in CA 3033 N

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Fig. 5

System analysis plant model

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Fig. 6

Polarization curve at 800 °C calculated with the electrochemical model used in this work

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Fig. 7

Sensitivity analysis on FU: electrochemical model

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Fig. 8

Sensitivity analysis on FU: efficiency map

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Fig. 9

Sensitivity analysis on inlet biogas composition: efficiency map

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Fig. 10

Sensitivity analysis on internal reforming ratio: efficiency map

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Fig. 11

Air compressor and air flow rate

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Fig. 12

Sensitivity analysis on S/C ratio: efficiency map

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Fig. 13

Sensitivity analyses results summary for electrical efficiency

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Fig. 14

Sensitivity analyses results summary for global efficiency

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