Optimization design of separators for removing solid particles from main steam pipeline of high-parameter steam turbine

•Particle rebound models were developed using high temperature test results.•ηp of 100μm particle can reach up to 78% under a small amount of transferring steam.•Qs equals to 0.25% is recognized as the optimum separation point.•Particle trap B with annulus inlet is the optimal one considering ηp and ΔP.•Effect of particle trap on the heat rate of thermal system is less than 0.15%.