Operating scenario of 3GWth class FFHR power plant with bypass controlled supercritical CO_2 gas turbine power generation system

摘要

In order to achieve high power generation efficiency, facility compactness, high safety, and high coexistence with fuel tritium in the 3 GWth class FFHR(Force Free Helical Reactor) power plant, optimization, performance and operation scenario of the power generation system of the power plant model using the axial flow type uniaxial supercritical CO2 gas turbine power generation system were examined. As a result, the following conclusions were obtained.(1) The most efficient and compact axial flow uniaxial design supercritical CO2 gas turbine power generation system suitable for 3 GWth FFHR power plant has a maximum heat capacity of 1.5GW th x 2, and the gas turbine conversion rate at that time was evaluated as 46.9 %(= 1,267MWe/2,700MWth). Therefore, split connection with two power generation systems is optimal for a 3 G Wth class FFHR power plant. Here, the operating speed of the turbo equipment was set to 3600 rpm in order to adapt this plant model to the power supply system in Japan.(2) Simultaneous supply of 818MWe/300 s electricity and 300MWth/30days heat is required at startup of the FFHR.(3) The in-house power during steady operation under the self-ignition condition was reduced to about 31.7MWe, and the amount of power generated at the transmission end was evaluated as 1,234MWe.