What is the temperature at the reheat outlet?

The reheat outlet temperature in a steam power plant is typically around 538°C, which is commonly designated as a standard temperature for reheating superheated steam before it enters the high-pressure turbine stages. This temperature is essential for optimizing the efficiency of the thermodynamic cycle, as it allows for a greater energy extraction from the steam without exceeding material capabilities of turbine components.

Maintaining this specific temperature ensures that the steam remains in a superheated state, which is necessary to prevent condensation within the turbine blades, which could lead to damage. The reheat process also helps to maintain a high enthalpy of the steam, improving the overall cycle efficiency.

In contrast, other temperatures listed, such as 600°C or 1100°C, are not typical for reheat conditions in most conventional steam plants. While they may occur in specialized applications, they exceed the common operational parameters. The option of 350°C is on the lower end and would not provide the necessary thermal energy needed for effective turbine operation in typical systems. Thus, 538°C is the standard recognized temperature at the reheat outlet for efficient steam turbine operation.