Research & Development
Research & Development
A-USC is used to refer to a 700 °C-class advanced ultra supercritical power generation system. Even the latest thermal power generation uses steam at a temperature of approximately 600 °C, but with A-USC, the steam is utilized at temperatures above 700 °C, which allows a great improvement in efficiency. A double reheat A-USC plant (main steam pressure:35 Mpa, main steam/reheat steam temperatures: 700 °/720 °/720 °C) is expected to achieve a 46% plus increase in net thermal efficiency [by HHV standards].
In order to make practical use of A-USC, Toshiba has to develop materials that can withstand steam with temperatures exceeding 700 °C, as well as design systems and structures that simultaneously achieve reliability and economic viability.
A comprehensive verification test of steam turbines is implemented at the steam turbine verification testing facility inside Mikawa Power Plant, owned by Sigma Power Ariake located in Omuta City, Fukuoka, under actual load and plant conditions. This can accelerate the speed of development and the time of marketing steam turbines with high performance and reliability.
Supercritical CO2 cycle power generation system produces electricity by burning CO2, fuel and oxygen injected into the combustor under high pressure and rotating turbines with high-temperature and high-pressure combustion gas generated.
Exhaust gas (consisting of CO2 and steam) from the turbines is cooled using a heat exchanger and is compressed using a high-pressure pump after moisture is separated and removed. Most CO2 is cycled to the combustor, and CO2 generated from combustion can be directly captured in a highly pressured and highly concentrated state.
Four companies, Toshiba, U.S. NET Power, McDermott and Exelon are implementing joint development activities since FY2012, and Toshiba is in charge of turbine and combustor for supercritical CO2 cycle as key components.
• Capturing all CO2 from combustion in a highly concentrated and highly pressured state without installing additional facilities for carbon capture and storage, and ensuring a power generation efficiency equivalent to existing gas turbine combined cycle power generation systems (GTCC).
• Comparing to GTCC with two turbines: steam turbine; and gas turbine, a downsized configuration can be achieved for power generation with one turbine.
• For combustion of natural gas as a fuel, oxygen is used instead of air; therefore eco-friendly thermal power generation system can be achieved without generating nitrogen oxide from combustion.
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