DEWA

Projects & Engineering (Generation)

Instrumentation &Control

HRSG

Presented By

Mohamed J. Albahar

15912

Introduction

• What is a Combined cycle

– GT

– HRSG

– Steam Turbine or BPST

• Main Systems

• Gas fuel supply system

• WHRB supplementary firing system

• WHRB water and steam system

• WHRB Drain and vents system

• Condensate and feed water system

• Auxiliary steam and distribution system

• Service and instrument air system

Supplementary Firing System

& Burner Management System

• Fuel Gas to Burners

• Fuel Gas to Igniters

• Cooling Air

• Burners

• Scanners

Supplementary Firing

Water & Steam System

• Deaerator

• Feed water tank

• Pumps

• Economizer

• Flow Control Valve

• Boiler Drum

• Evaporator

• Superheater

• Desuperheater

Deaerator & Feedwater Tank

Boiler Drum Control and stop Valves

Tubes

Miscellaneous

• Drains and vents

• Blowdown System

• Sampling system

• Nitrogen system

• Chemical dosing system

• Instrument air service

Blowdown

Start-up Sequence

• Diverter Damper is ready to operate

• Purging

• Supplementary Firing Control valve is ready to operate

• Flame detectors are ready to operate

• Feed water pump and control valve are ready to operate

• All boiler inlet valves are ready to operate

• Blow dawn is ready to operate

• No condensate water at the superheater drain

• GT is at 20 MW and flue gas temp is less than 360 Celsius

Trip

• GT Trip

• The Boiler’s protection (Level, Temp, Pressure)

• Feed pump trip

• ACCCW Trip

• Cooling Fan Trip

• Steam or BPST Trip

Conclusion

The Outcome

HRSG System

Main and auxiliary systems

Instrumentation and components

Reading and Analysing P & I Diagrams

Thanks for your attention

Any Questions