Heat Recovery Application Overview

Recovered heat can be used for many purposes. Applications include air or water heating, steam production for thermal loads or for additional power production, absorption chilling, and regeneration of desiccant dehu-midification systems. The most common heat recovery applications are described below:

• Exhaust gas can be used directly for process air heating, serving industrial ovens and dryers, or for the preheating of combustion air.

• Fluid heating can be accomplished with several types of heat exchangers that use exhaust gas from a gas turbine or reciprocating engine, or circulating water from engine coolant systems.

• Steam production at a wide range of pressures can be accomplished by passing exhaust gas through a heat recovery steam generator (HRSG). Output and temperature can be increased through supplementary firing.

• Absorption refrigeration cycles can provide chilled water using exhaust gas, steam, or hot water. Engine coolant system hot water or low-pressure steam can only be used for single-stage absorption, while exhaust gas or high-pressure steam can be used for high-efficiency two-stage absorption chilling. A schematic representation of heat recovery application options for a gas turbine cogeneration system is shown in Figure 8-1.

Fig. 8-1 Representative Heat Recovery Application Options for Gas Turbine.

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