Monday 27 May 2019

Heat Recovery Steam Generator (HRSG)

Heat Recovery Steam Generator (HRSG) 1
Introduction  A heat recovery steam generator or HRSG is an energy recovery heat exchanger that recovers heat from a hot ...
Operation Mode  Combined Cycle Mode:-  Power is generated via a steam turbine generator.  Cogeneration Mode:-  Steam p...
5 The HRSG consist of three main parts : 1-evaporator 2-ecnomizer 3-super heater And anther three parts: 4-reheaters 5-dea...




1. Evaporator 6 HRSG evaporator or boiler sections act to vaporize water and produce steam in one component.
2. Ecnomizer 7 The gas temperature leaving an evaporator varies from 150~ 320 deg c, depending upon the steam pressure bei...
3. Super heater 8 While the evaporator produces dry-saturated steam, this is rarely acceptable for large steam turbines, a...
4. Reheaters  Reheaters are a heat transfer component similar to super heaters, and are employed in advanced multi-pressu...
5. Deaerators 10 All power plant cycles employ a deaerator to control oxygen levels in the feedwater. Heating steam is pro...
6. Preheaters  Preheaters are located at the coolest end of the HRSG gas path, and absorb energy from the gas stream to p...

Types of HRSG :  1 - Natural-circulation (NC)  2- Forced-circulation (FC)  3-A once-through (OT) 12
Type of HRSG (Based On Heat Input )  Unfired  Fired  Supplementary Fired  Exhaust Fired
Unfired HRSG When the available GT exhaust energy, the consequential HRSG steam production, and the steam requirements are...
Unfired Supplementary Fired Exhaust Fired
16 Types Of HRSG (Based on operation pressure)  Single Pressure  Multi Pressure
17 Post combustion emission controls The most common post-combustion process applied to HRSGs is Selective Catalytic Reduc...
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