HEAT RECOVERY STEAM GENERATOR
A heat recovery steam generator (HRSG) is an advanced energy recovery system that efficiently captures heat from hot gas streams, such as combustion turbines or waste gas streams, converting it into usable steam.
This versatile equipment serves dual purposes - it can generate steam for industrial processes (cogeneration) or power steam turbines in combined cycle applications
- Economizer
- Evaporator
- Superheater
- Water preheater
Types and Classifications
Flow Direction Categories
Horizontal HRSGs: Feature horizontally flowing exhaust gases over vertical tubes
Vertical HRSGs: Utilize vertically flowing exhaust gases over horizontal tubes
Pressure Level Categories
Single Pressure: Employs one steam drum for single-pressure steam generation
Multi Pressure: Features two (double pressure) or three (triple pressure) steam drums
Supplemental Systems
The HRSG can be enhanced with supplemental firing systems and diverter valves for improved operational control2. These additions enable:
- Enhanced steam production
- Increased electrical output
- Flexible operational control
Applications:
- Energy production facilities
- Desalination plants in the Persian Gulf region
- University campus energy systems
- Maritime vessels for efficient heat recovery
Technical Specifications
The system operates optimally with NOx catalyst temperatures between 650 and 750°F (343–399°C). For enhanced efficiency, low-temperature NOx catalysts can function between 350–500°F (177–260°C)