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Research Papers

MGT/HTFC Hybrid System Emulator Test Rig: Experimental Investigation on the Anodic Recirculation System

[+] Author and Article Information
Mario L. Ferrari

Thermochemical Power Group (TPG)–DiMSET, Università di Genova, Genova 16145, Italymario.ferrari@rrfcs.com

Matteo Pascenti

Thermochemical Power Group (TPG)–DiMSET, Università di Genova, Genova 16145, Italymatteo.pascenti@unige.it

Loredana Magistri

Thermochemical Power Group (TPG)–DiMSET, Università di Genova, Genova 16145, Italyloredana.magistri@unige.it

Aristide F. Massardo

Thermochemical Power Group (TPG)–DiMSET, Università di Genova, Genova 16145, Italymassardo@unige.it

J. Fuel Cell Sci. Technol 8(2), 021012 (Nov 30, 2010) (9 pages) doi:10.1115/1.4002316 History: Received March 02, 2010; Revised June 18, 2010; Published November 30, 2010; Online November 30, 2010

The Thermochemical Power Group (TPG) of the University of Genoa designed and installed a complete hybrid system emulator test rig equipped with a 100 kW recuperated micro gas turbine, a modular cathodic vessel located between recuperator outlet and combustor inlet, and an anodic recirculation system based on the coupling of a single stage ejector with an anodic vessel. The layout of the system was carefully designed, considering the coupling between a planar SOFC stack and the 100 kW commercial machine installed at TPG laboratory. A particular pressurized hybrid system was studied to define the anodic side properties in terms of mass flow rates, pressures, and temperatures. In this work, this experimental facility is used to analyze the anodic ejector performance from fluid dynamic and thermal points of view. The attention is mainly focused on the recirculation factor value in steady-state conditions. For this reason, a wide experimental campaign was carried out to measure the behavior of this property in different operative conditions with the objective to avoid carbon deposition in the anodic circuit, in the reformer, and in the fuel cell stack.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

The initial reference plant layout called SYS1

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Figure 2

Emulated system layout (SYS2)

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Figure 3

Stack model layout

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Figure 4

The anodic loop layout: (a) external view and (b) inside view

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Figure 5

Anodic recirculation system: installation details

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Figure 6

Plant layout and instrumentation (the complete legend for transducers is in Refs. 23,38)

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Figure 7

Test rig picture (vessel side)

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Figure 8

Control and acquisition systems: main panel

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Figure 9

Rotational speed values during the whole test in grid-connected mode

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Figure 10

Anodic ejector performance in grid-connected mode: recirculation ratio (F) referred to its design value (F0)(40) and pressure rise (DPEj). The “max kW” load ranges from 74.1 kW at MP=20 g/s to 72.2 kW at MP=5 g/s.

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Figure 11

Machine rotational speed (N) and anodic ejector secondary inlet temperature (TEjS1) in grid-connected mode. The “max kW” load ranges from 74.1 kW at MP=20 g/s to 71.9 kW at MP=0 g/s.

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Figure 12

Anodic ejector outlet temperatures in grid-connected mode. The “max kW” load ranges from 74.1 kW at MP=20 g/s to 72.2 kW at MP=5 g/s.

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Figure 13

Anodic ejector performance in stand-alone mode: recirculation ratio (F) referred to its design value (F0)(40) and pressure rise (DPEj)

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Figure 14

Turbine outlet temperature (TT2) and anodic ejector secondary inlet temperature (TEjS1) in stand-alone mode

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Figure 15

Anodic ejector outlet temperatures in stand-alone mode

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