Research Article
Optimal Operation Conditions for a Methane Fuelled SOFC and Microturbine Hybrid System
Table 1
Basic parameters of the components of the hybrid system and streams and blocks meaning in plant schemes.
| | Turbomachinery configuration | Radial | | Compression ratio | 3.9 | | Compressor isentropic efficiency | 0.75 | | Expander isentropic efficiency | 0.85 | | Air flow [kg/s] | 0.808 | | MTG mechanical power [kW] | 110 | | Rotation speed [rpm] | 64000 | | Maximum turbine inlet temperature [K] | 1250 | | Burner power [kW] | 300 | | SOFC configuration | Tubular | | Anode thickness [mm] | 0.1 | | Cathode thickness [mm] | 2.2 | | Interconnection thickness [mm] | 0.085 | | Electrolyte thickness [mm] | 0.04 | | Combustion efficiency | 0.98 | | Heat exchanger efficiency | 0.87 | | Current density (dfc) [A/m2] | 2000–3600 | | Fuel utilization | 0.7–0.9 | | Stream 1 | Cold compressed air entering the heat exchanger | | Stream 2 | Hot compressed air entering the cathode | | Stream 3 | Uncompressed CH4 | | Stream 4 | Compressed CH4 | | Stream 5 | CH4 and anode outlet mixture entering the anode | | Stream 6 | Anode outlet | | Stream 7 | Anode outlet mixing with CH4 | | Stream 8 | Anode outlet mixing with cathode outlet | | Stream 9 | Cathode outlet | | Stream 10 | Mixture entering the turbine | | Stream 11 | Turbine outlet entering the heat exchanger | | Stream 12 | Heat exchanger outlet | | Stream 13 | CH4 and anode outlet mixture entering the prereformer | | Stream 14 | Prereformer outlet entering the anode | | Stream 15 | Afterburner outlet entering the turbine | | Stream 16 | Mixer outlet | | Block A | Air compressor | | Block B | Turbine | | Block C | Alternator | | Block D | CH4 compressor | | Block E | Heat exchanger | | Block F | Inverter | | Block G | Solid oxide fuel cell | | Block H | Prereformer | | Block I | Afterburner | | Block J | Mixer |
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