In view of the high superheat degree of bleeding steam in double-reheat units

thermal performance of high pressure heaters and deaerator was compared among the double-turbine regeneration system

regeneration system without outer steam cooler and regeneration system with outer steam cooler. Study shows that the superheat degree of No.2 and No.4 high pressure heaters is lower in the system with outer steam cooler

but the exergy loss of the whole regeneration system doesn't decline obviously. The result indicates that the superheat degree of No.2 to No.4 high pressure heaters and deaerator decline notably in double-turbine regeneration system

and the exergy efficiency of these heaters are all over 0.96. Compared with the regeneration system without outer steam cooler

the exergy loss in double-turbine regeneration system is reduced by 53%. Compared with the regeneration system with outer steam cooler

the exergy loss in double-turbine regeneration system is reduced by 51%. The results cloud be a reference for improving the regeneration efficiency and unit performance of double-reheat units.