Which of the following is NOT an alternative name for a heat recovery steam generator (HRSG)?

A heat recovery steam generator (HRSG) is specifically designed to capture waste heat from industrial processes, such as the exhaust from gas turbines, to generate steam, which can then be used for electricity generation or other processes.

The term “waste-heat recovery boiler” refers to the same concept, as it emphasizes the boiler's function in recovering heat that would otherwise be wasted. Similarly, “turbine exhaust gas boiler” is directly related to HRSGs because these systems often utilize the hot exhaust gases from turbines to heat water and produce steam. “Energy recovery boiler” also describes an HRSG since it outlines the primary operation of converting thermal energy from exhaust gases into useful steam.

In contrast, “passive heat generator” is not a recognized term associated with HRSGs. This option does not accurately represent the active nature of HRSGs, which are engineered specifically to recover and convert waste heat into usable energy, as opposed to a “passive” system which would imply a lack of active recovery or generation processes.