Shaft seal steam supply system

The invention discloses a shaft seal steam supply system which mainly comprises a boiler steam pipeline, a heat supply mother pipe, a first shaft seal steam supply device, a second shaft seal steam supply and a third shaft seal steam supply device. The shaft seal steam supply system is characterized in that the three shaft seal steam supply devices are arranged between the boiler steam pipeline and the heat supply mother pipe, and a valve is arranged at the tail end of the heat supply mother pipe and used for a steam supply user. The shaft seal steam supply system has the advantages that a shaft seal steam supply source is connected to the position, the closest to a local machine, of the heat supply mother pipe to solve the problem of steam supply sources for two paths; steam pressure of the path is about 0.6 mpa which is about 20 times the shaft seal pressure, and operation is facilitated; the temperature is regulated to about 300 DEG C, and the shaft seal steam consumption requirement can be met without dec