In order to improve the combustion efficiency of circulating fluidized bed(CFB) boiler firing hard-toburn coal

the technical concept of high-temperature CFB boiler was put forward

and a high-temperature CFB experimental research platform was established. Moreover

high-temperature combustion and pollutant emission characteristics were researched in the CFB test facility for hard-to-burn coal. The experimental research result shows that

increasing the combustion temperature can obviously reduce combustible matter mass fraction in fly ash and increase the combustion efficiency for hard-to-burn coal. However

as the operating bed temperature increases

the desulfurization efficiency decreases and the NO_x emission increases. Based on experimental research result

technical plan of ultra-supercritical 660 MW high-temperature CFB boiler was designed and researched

and the distribution characteristics of ash particle flow of six cyclone separators in the boiler scheme was simulated numerically. Finally

the optimum layout of cyclone separators was determined

which laid a technical foundation for the subsequent structural design and engineering application of ultra-supercritical 660 MW high-temperature CFB boiler.