Heat regeneration system and heat regeneration method additionally provided with No.0 high-pressure heater

The invention discloses a regenerative system additionally provided with a No.0 high-pressure heater and a regenerative method, and relates to the field of regenerative systems of steam turbine units of thermal power plants, and the regenerative system comprises the No.0 high-pressure heater and N high-pressure heaters, the steam pressures at the steam inlets from the 0 # high-pressure heater to the n # high-pressure heater are sequentially reduced; the No.0 high-pressure heater and the N high-pressure heaters are connected in series; a condensation working medium drain outlet of the No.0 high-pressure heater is communicated with a working medium inlet of the flash tank, a flash steam outlet of the flash tank is communicated with a steam inlet of the No.1 high-pressure heater or/and a steam inlet of the deaerator, and a flash water outlet of the flash tank is communicated with a drain inlet of the No.2 high-pressure heater or/and the deaerator. According to the method, drained water of the No.0 high-pressure