Vapor-liquid two-phase two-stage injection boosting device of steam power system

The invention aims to provide a steam power system vapor-liquid two-phase two-stage injection boosting device which comprises a shell, a shell inlet and a shell outlet are formed in the two ends of the shell respectively, the shell inlet is communicated with a hot steam inlet, the shell outlet is communicated with a high-pressure fluid outlet, and a low-pressure gas inlet and a low-pressure water inlet are formed in the shell respectively. A steam nozzle, a mixed gas nozzle and a steam-liquid mixing nozzle are sequentially arranged in the shell from the inlet to the outlet. A steam-gas and condensate water injection device in an existing system can be integrated and replaced, low-pressure gas and low-pressure condensate water in the system are injected, mixed, boosted and then discharged through gas extraction of the steam turbine or high-energy waste steam, and work structure integration is conducted on an original single-function injection device of a steam thermodynamic system. Meanwhile, the device is bas