Vacuum-pumping system for condenser of thermal power plant

The utility model provides a thermal power plant condenser vacuumizing system which comprises a water jet steam extractor communicated with a condenser through an air extraction pipeline and a communicating pipe communicated with the air extraction pipeline and extending in the vertical direction, a part of the air extraction pipeline is bent to be in a U shape, and an isolating valve is arranged on the communicating pipe. The two ends of the communicating pipe are communicated with the lowest point of the air pumping pipeline and the water collecting tank respectively, the top of the water collecting tank is connected with the air pipe provided with the air valve, the bottom of the water collecting tank is connected with the drainage pipe provided with the drainage valve, and when the isolating valve, the air valve and the drainage valve are all closed, the interior of the water collecting tank is in a sealed state; the technical effects that when the isolating valve is opened and the air valve and the drain