Device for improving vacuum of thermal power generating unit

The utility model discloses a device for improving vacuum of a thermal power generating unit. The device comprises a turbine low-pressure cylinder, the turbine low-pressure cylinder is provided with a steam exhaust pipeline, the steam exhaust pipeline is connected with a steam condensation device and an air cooled condenser, and mixing devices are arranged in the steam exhaust pipeline and an air cooled condenser steam distribution pipeline of the air cooled condenser. The lower end of the air cooled condenser is connected with a condensation water tank and an air extractor, the condensation water tank is connected with a circulating condensation water collecting tank through a condensation water adjusting valve, the circulating condensation water collecting tank is connected with the air extractor, the air extractor is connected with a reverse Rankine cycle electric pump refrigeration system through a second cooling water adjusting valve and a circulating cooling water pump in sequence, the circulating condensation water collecting tank is connected with a reverse Rankine cycle electric pump refrigeration device through a block valve, a water intake pump and a demineralized water adjusting valve in sequence, the circulating condensation water collecting tank is connected with the steam condensation device through a circulating water pump, the circulating cooling water pump and a first cooling water adjusting valve are connected with steam condensation device, and the condensation water tank is connected with the steam condensation device through the circulating water pump.