SAGD (steam assisted gravity drainage) wet steam injection station system, boiler water recycling method thereof

The invention provides an SAGD (steam assisted gravity drainage) wet steam injection station system, and a boiler water recycling method thereof. The system comprises a steam generator and a separator, wherein the separator is used for separating high-dryness steam and high-temperature saline water output by a boiler; the system also comprises a flash evaporator, a water maker, a drum boiler and a heat exchanger; the flash evaporator is connected with the separator for carrying out flash evaporation treatment on the high-temperature saline water separated by the separator so as to generate wet steam and high-concentration saline water; the water maker is connected with the flash evaporator for carrying out evaporative desalination treatment on the high-concentration saline water generated by the flash evaporator so as to generate product water by the wet steam generated by the flash evaporator; the drum boiler is connected with the water maker for heating the product water generated by the water maker to form overheat steam, and the heat exchanger is respectively connected with the water maker and the steam generator for recovering smoke afterheat generated by the steam generator as a supplied heat source of the water maker for carrying out evaporative desalination treatment. According to the wet steam injection station system, energy and water can be saved and the utilization of heat can be improved.