What function does a reheater serve in a steam turbine system?

In a steam turbine system, a reheater plays a crucial role by receiving steam that has already expanded through a portion of the turbine. After the steam has performed work by passing through the turbine stages, it exits at a lower temperature and pressure than when it entered. The reheater's function is to reintroduce heat to this expanded steam, allowing it to regain energy before re-entering the turbine for further expansion.

This process enhances thermal efficiency and optimizes the overall performance of the turbine by increasing the amount of energy extracted during each cycle. By reheating the steam, it helps maintain a higher temperature, which is vital for improving the efficiency of the steam cycle and reducing the risk of moisture formation within the turbine, which could potentially lead to turbine blade erosion and decreased efficiency.

The other options do not address the specific role of a reheater in this context. While increasing fuel consumption might relate to overall system efficiency, it does not directly define the function of a reheater. Reducing steam pressure and preparing water for heating pertain to different components and processes within the steam cycle rather than the reheating process itself.