Nine-stage regenerative extraction steam system of 1000MW thermal power generating unit turbine

The invention discloses a nine-stage regenerative extraction steam system of a 1000MW thermal power generating unit turbine. The nine-stage regenerative extraction steam system comprises a condenser, a turbine low-pressure cylinder, a turbine intermediate-pressure cylinder, a turbine high-pressure cylinder and a boiler. The turbine high-pressure cylinder is correspondingly connected with a first high-pressure heater and a second high-pressure heater. The turbine intermediate-pressure cylinder is correspondingly connected with a third high-pressure heater, a deaerator and a fifth low-pressure heater. The turbine low-pressure cylinder is correspondingly connected with a sixth low-pressure heater, a seventh low-pressure heater, an eighth low-pressure heater and a ninth low-pressure heater. Low-pressure drainage pumps are arranged on the seventh low-pressure heater. The eighth low-pressure heater and the ninth low-pressure heater directly drain water to the condenser through an eighth drainage pipe and a ninth drainage pipe respectively. The nine-stage regenerative extraction steam system of the 1000MW thermal power generating unit turbine has the advantages that the number of regeneration stages is increased by one, and therefore thermal efficiency is improved; the problem that because steam pressure is low, unsmooth drainage is probably caused in the low-load operation process is solved; although the number of devices is increased, operating cost is reduced, and accordingly the nine-stage regenerative extraction steam system is more economical.