Subcritical thermal power generating unit efficiency-improving technical improvement device

The utility model provides an efficiency improvement device of a subcritical thermal power generating unit. According to the efficiency improvement device, an ultra-supercritical boiler is used for driving an ultra-supercritical front steam turbine and a subcritical steam turbine; a steam outlet of the ultra-supercritical boiler is connected with a steam inlet of the ultra-supercritical front steam turbine; a steam outlet of the ultra-supercritical front steam turbine is connected with the primary reheater; the primary reheater is communicated with a steam inlet of the subcritical steam turbine, so that output steam of the ultra-supercritical front steam turbine drives the subcritical steam turbine after being subjected to primary reheating; according to the utility model, a subcritical thermal power generating unit can be upgraded into a thermal power generating unit containing ultra-supercritical equipment, so that the unit index is improved. 本实用新型提出亚临界火电机组提效技改装置，所述提效技改装置以超超临界锅炉驱动超超临界前置汽轮机、亚临界汽轮机；所述超超临界锅炉的出