Final answer:
A boiler that generates steam from a chemical or thermal process or a prime mover is known as a heat recovery steam generator. It effectively recycles heat to produce steam for turbine operation, maximizing energy efficiency.
Step-by-step explanation:
A boiler that generates steam from heat produced by a chemical process, a thermal process, or a prime mover is known as a heat recovery steam generator. This device captures the excess heat from the aforementioned processes to produce steam, which can then be used to drive turbines and generate electricity.
In a typical cycle, after the steam has navigated through the turbines, it is condensed back into water inside a condenser. This is done by circulating the steam around tubes that carry cooling water. The process involves thermal exchange where the steam releases its heat to the cooler water and converts back to its liquid state. The condensed water is then returned to the steam generators to repeat the cycle, showcasing an efficient use of energy and fulfilling the role of a heat recovery steam generator.
The primary purpose of this system is to maximize efficiency by utilizing the thermal energy that would otherwise be wasted. In applications such as pressurized water reactors, the water is heated through nuclear fission and then run through a steam generator, producing the steam required to turn turbines and generate electricity. This system is essential in various types of power plants, including nuclear, fossil fuel, and combined cycle operations.