| 摘要 |
PROBLEM TO BE SOLVED: To provide a non-condensable gas extracting device modified to perform stable control of a water level in an after-cooler without being influenced by a pressure fluctuation in a system. SOLUTION: The non-condensable gas extracting device for a geothermal turbine plant is formed that steam ejectors 5 ands 6 in a plurality of stages and coolers 3 and 4 are connected in succession to a main condenser 2 of a geothermal turbine 1 and non-condensable gas extracted from the main condenser is discharged to the outside of a system. Drain generated at a cooler in each stage is recovered to the main condenser through drain line. A water level transmitter 15 is attached to the after-cooler 4 at a final stage and instead of a U-shaped pipe type drain pipe (U-seal) of a conventional device, a water level regulating valve 16 is connected to drain line 17 arranged between the after-cooler and the main condenser. Based on an output signal from the water level transmitter, the opening of the water level regulating valve is controlled and with a water level in the after-cooler kept in a constant value, drain generated in the drum is discharged to the main condenser.
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