High inlet and outlet air temperature of steam turbine generator

How does turbine inlet temperature affect power output?

The increase in turbine inlet temperature means an increase in superheat at constant inlet steam pressure and condenser pressure gives a steady improvement in the power output of the turbine. Raising the inlet steam temperature also reduces the wetness of the steam in the later stages of the turbine and improves the power output of the turbine.

What is the inlet temperature of a steam turbine?

The highest inlet steam temperature currently applied to actual supercritical pressure and USC steam turbines is between 566°C and 620°C. However, a next-generation A-USC pressure steam turbine project is aiming at 700°C-class inlet temperature application, as a national development project.

How does vapor quality affect steam turbine inlet flow?

Other significant conclusions are as follow: By increasing steam turbine outlet vapor quality, the temperature and pressure at steam turbine inlet flow will be increased. An increase in HRSG high pressure and decrease HRSG low pressure, increases system exergy efficiency and decreases the total rate of the system.

Why is a higher inlet steam temperature important?

Raising the inlet steam temperature also reduces the wetness of the steam in the later stages of the turbine and decreases specific steam consumption. At lower temperature, enthalpy will be low, work done by the turbine will be low, turbine efficiency will be low, hence steam consumption for the required output will be higher.

Why is steam turbine efficiency the highest value?

Steam turbine efficiency has the highest value for the quality of 88% outlet with no cost constraint due to high superheat degree at the inlet. The high superheat degree in steam turbine inlet allows higher turbine efficiency to be selected regardless of the quality constraint at outlet.

How does steam inlet pressure affect design efficiency?

To retain the design efficiency the steam inlet pressure should be maintained. Lowering steam inlet pressure reduces turbine efficiency and increases steam consumption. A 10% increase in steam pressure will reduce the steam consumption by about 1% in a condensing steam turbine and by about 4% in a back pressure steam turbine.