Fuel CellsSystem Overview
Solid oxide fuel cells (SOFC) are operated under high temperatures and form a high-efficiency power generating system when combined with micro gas turbines.
- Built-in Cell Stack
(Fuel cells made up of cylindrical SOFC cell stacks)
- Business alliance with NGK Spark Plug Co., Ltd. for the mass production of cell stacks
Tokyo Gas Co., Ltd. Senju Techno Station Demonstration: Model 10 Hybrid Power Generation System achieved continuous operation for 4,100 hours (September 2013)
Kyushu University Ito Campus Demonstration: Model 15 Hybrid Power Generation System achieved cumulative operating time of 10,000 hours (October 2016)
Tokyo Gas Co., Ltd. Senju Techno Station Demonstration: Model 15 Hybrid Power Generation System began demonstration (September 2016)
Mechanisms of Power and Heat Generation
- Fuel gas is inserted into the SOFC to generate power (first stage)
- High-temperature SOFC exhaust gases are inserted into the micro gas turbine (MGT) to generate additional power (second stage)
- Heat is removed from the high-temperature MGT exhaust gases to produce heated water or steam
- Optimum co-generation system for sites with high electricity demand, characterized by high power generating efficiency
- A wide range of fuels can be used for the fuel gas, including natural gas, biogas, hydrogen, propane and butane.
The hybrid system is made up of a fuel system (red line in figure), air system (blue line) and exhaust gas system (yellow line). Fuel gas passes through the desulfurizer to remove its sulfur content, and is then inserted into the SOFC after being pressurized in a compressor. Meanwhile, air is inserted into the SOFC after being pressurized through the MGT. Exhaust fuel from the SOFC is pressurized by a recirculating blower. Then, part of it is returned to the SOFC, with the remainder inserted into the combustion chamber of the MGT together with exhaust air. The exhaust gases combusted in the combustion chamber undergo heat exchange with air sent to the SOFC by means of a regenerative heat exchanger, and after heated water and steam have been produced with the exhaust heat recovery unit, the exhaust is released into the air.
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