Dumping Rejected Heat

When heat recovery is used, there are two factors that are critical to the integrity of the heat recovery system:

• The ability to provide for critical thermal energy requirements in the event of an interruption of the supply of recovered heat.

• The ability to effectively dump the rejected heat in the event of an interruption of the demand for the thermal energy.

A means of dumping rejected heat on an emergency basis may be critical to ensuring required equipment cooling. In addition, it may be economical to operate prime movers on occasion without full utilization of available rejected heat.

A reciprocating engine requires an alternate means of heat rejection for both engine exhaust and coolant systems. When heat recovery is not required, exhaust must either be bypassed around the heat recovery system or the recovered heat must be subsequently dumped. Engine cooling systems may utilize an independent fan-powered dump radiator or an interconnection with the facility's cooling system, typically a cooling tower.

An integral component of a gas turbine/HRSG system is a diverter. The diverter is installed upstream of the HRSG and vents to atmosphere the turbine excess exhaust gas stream before it enters the HRSG. Diverter valves also protect the heat recovery boiler in the event of a malfunction of the feedwater system and permit start-up of the gas turbine before the boiler.

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