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The dangers of excessively high air temperature in steam turbine generators

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particular operating conditions like steam inlet temperature and turbine exhaust pressure/exhaust vacuum, steam inlet pressure, which affects the performance of the turbines in a significant way.

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The dangers of excessively high air temperature in steam turbine generators [PDF]

6 FAQs about [The dangers of excessively high air temperature in steam turbine generators]

How does inlet steam temperature affect the efficiency of a turbine?

Raising the inlet steam temperature also reduces the wetness of the steam in the later stages of the turbine and improves the turbine internal efficiency. In steam cycle, the thermal efficiency increases gradually with increase in turbine inlet steam temperature which thereby increases the quality of steam at the turbine exhaust.

What happens if a steam turbine reaches a higher temperature?

At higher steam inlet temperatures, heat extraction by the turbine will also be increased. An increase of about 100 °F (55 °C) will reduce the steam consumption by about 6.6% in a condensing steam turbine and 8.8% in a back pressure turbine.

What are the dangers of a steam turbine?

The remaining dangers have more immediate effects on the plant. They are detected by systems that depressurize the hydraulic pressure of the governing system. This results in shutting the steam valves and disconnecting of the generator. The preceding list includes dangers that only affect the turbine.

What happens if steam pressure is raised without raising inlet temperature?

If steam pressure is raised without raising inlet temperature, the wetness fraction of the low-pressure (LP) turbine increases, which results in wetness loss increase at the LP turbine. When wetness fraction of the LP turbine becomes 8%–12%, the countermeasure against drain erosion to the long blade of the LP turbine is required.

What factors affect the performance of a turbine?

Turbines are designed for a particular operating conditions like steam inlet pressure, steam inlet temperature and turbine exhaust pressure/ exhaust vacuum, which affects the performance of the turbines in a significant way. Variations in these parameters affects the steam consumption in the turbines and also the turbine efficiency.

How does pressure affect steam turbine performance?

The effect on efficiency for 10% increase in pressure is about 1.5% for a condensing steam turbine and 0.45% for a back pressure steam turbine. Turbine steam inlet temperature is another major parameter affecting turbine performance.

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