A hydrogen-cooled turbo generator is a turbo generator with gaseous hydrogen as a coolant. Hydrogen-cooled turbo generators are designed to provide a low-drag atmosphere and cooling for single-shaft and combined-cycle applications in combination with steam turbines[1], because of the thermal conductivity of hydrogen gas this is the most common type in its field today.
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History
Based on the air-cooled turbo generator gaseous hydrogen went into service as a coolant in the rotor and the stator in 1937 at Dayton, Ohio, in October by the Dayton Power & Light Co[2] allowing an increase in specific utilization and a 99.0 % efficiency.
Design
The use of gaseous hydrogen as a coolant is based on its properties, low density, high specific heat, and thermal conductivity. Hydrogen gas is circulated in a closed loop to remove heat from the active parts then it is cooled by gas-to-water heat exchangers on the stator frame. The working pressure is up to 6 bar.
An on-line thermal conductivity detector (TCD) analyzer is used with three measuring ranges. The first range (80-100% H2) to monitor the hydrogen purity during normal operation. Every 2% reduction in the purity of the hydrogen coolant increases windage losses in the turbine. The second (0-100% H2) and third (0-100% CO2) measuring ranges allow safe opening of the turbines for maintenance[3].
See also
References
External links
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