PURPOSE:To allow a continuous operation under a low load by providing multiple control systems independently from each other on sprays provided in the exhaust chamber of a steam turbine and setting the spray flow of each system separately corresponding to turbine operating conditions. CONSTITUTION:Spray nozzles 35, 40 are provided in the exhaust chamber 31 of the low-pressure section 30 of a steam turbine, the nozzle 35 is controlled by a spray water injection control unit 34 inputting a signal from the temperature detector 32 of the exhaust chamber, and the nozzle 40 is controlled by a control unit 39 inputting a signal from the load detector 37 of the turbine. These two control systems are provided independently from each other, and the necessary spray flow is set separately. Accordingly, the overheat of the exhaust chamber due to the injection of spray water with too little spray flow into the exhaustion chamber is prevented, and the corrosion of the final-stage blades due to the excessive injection is also prevented.
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