Drainage optimization method for preventing steam turbine water inflow caused by pipe explosion of shaft seal heater

The invention discloses a drainage optimization method for preventing steam turbine water inflow caused by pipe explosion of a shaft seal heater. The drainage optimization method comprises the following steps that (1) the shaft seal heater of a thermal power plant steam turbine thermodynamic system is transformed; and (2) a shaft-added steam inlet pipeline and/or a shaft-added fan outlet main pipe of the thermal power plant steam turbine thermodynamic system are/is transformed. According to the drainage optimization method for preventing steam turbine water inflow caused by pipe explosion of the shaft seal heater, after transformation, the water level of the shaft seal heater can be monitored online in real time through the remote transmission analog quantity water level gauge, and the water level of the shaft seal heater can be adjusted and controlled by controlling opening and closing of the corresponding electric door; the problem that the shaft seal heater is full of water and enters a cylinder is avoided