Up-Grade Bypass Controlled Supercritical CO₂ Gas Turbine for 0.6 GW_th FFHR Series Fusion Reactors

抄録

For the purpose of further improving the power generation performance by the supercritical CO₂ gas turbine power generation system, aerodynamic optimum and heat transfer flow analysis were carried out for vertical single-axial bypass control type supercritical CO₂ gas turbine power generation system model in the 0.6 GW class FFHR-b1 nuclear fusion power reactor model. As a result, the following conclusions were obtained.

(1) Since the outlet temperature of the 5-stage final stage of the improved main compressor as an alternative to the low/high pressure compressor can be lowered to 318 K compared to the conventional design (outlet temperature 334 K), there are design cases that do not require an intercooler in the conventional design.

(2) As a result of reviewing the structural design and operating conditions of the turbine, the output increased by about 1.1%.

(3) Since a compact design with a total length of about 2.2 m is possible in the design of the above CO₂ gas turbine power generation system (excluding the generator), the feasibility of designing a vertical single-axial bypass control type supercritical CO₂ gas turbine power generation system is clarified.

From these results, the redesigned vertical uniaxial bypass control type supercritical CO₂ gas turbine power generation system is expected to be a compact and economical power generation system that exceeds the power generation efficiency of the conventional design model up to about 0.6%.