Anti-cavitation steam turbine and operation method thereof

Abstract

The invention discloses an anti-cavitation steam turbine and an operation method thereof.The anti-cavitation steam turbine comprises a steam turbine body, a guide cylinder and a steam supply pipe set, the steam turbine body is provided with a low-pressure cylinder and a final-stage rotor arranged in the low-pressure cylinder, the final-stage rotor is provided with a plurality of final-stage rotor blades, and the low-pressure cylinder is provided with a final-stage root exhaust port; the multiple guide cylinders are cylindrical and are coaxially distributed in the position, close to the tail-stage root exhaust port, in the low-pressure cylinder, an annular gap is formed between every two adjacent guide cylinders, multiple steam nozzles are annularly arranged on each guide cylinder at intervals, and the nozzle ends of the steam nozzles incline to face the tail-stage root exhaust port; the steam supply pipe group is communicated with the air inlet ends of the plurality of steam sprayers; and the steam spray head sprays steam containing water drops towards the tail-stage root exhaust port to suck the steam containing the water drops in the tail-stage rotor root area, so that the steam containing the water drops in the corresponding tail-stage rotor root area in the low-pressure cylinder is prevented from cavitation on the roots of the tail-stage rotor blades.

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