Operation method of water feed pump turbine

The invention discloses an operation method of a water feed pump turbine, and relates to the technical field of turbines. The operation method comprises the following steps of operating a single steam-driven water feed pump, stopping a make-up water pump and supplementing water by vacuum suction, driving the water feed pump turbine by auxiliary steam to replace an electric pump to operate, and performing variable-frequency optimization adjustment on a desulfurized seawater booster pump. The station service power consumption rate is effectively reduced. By optimizing a control loop, the reliability and stability of equipment operation are guaranteed, oil-smoke separation is achieved through a smoke exhaust mechanism, the operation safety of the equipment is guaranteed, the single steam-driven water feed pump is adopted, thermal protection is correspondingly changed, and it is guaranteed that no load return occurs when the single steam-driven water feed pump operates; and meanwhile, after the load of a unit is