Session: 13-03: Thermal performance of HRSG and turbine adjustable nozzle guide vane

Paper Number: 152169

Comparison of Two Different Approaches for Thermal Performance Evaluation of a Heat Recovery Steam Generator 

At one of the ACWA Power CCPP sites, it was revealed that heat recovery steam generator (HRSG) flow diverter baffles were missng. Detailed engineering drawings were reviewed and it was found out that the baffles were never installed during construction phase. HRSG flow diverter baffles were installed between the tube modules tube modules as well as at the casing sides. Baffles were also added at the top and bottom of the modules, whereby flue-gas could bypass into upper, lower dead spaces, and miss the heating surfaces. Pre and Post modification performance of the HRSG was evaluated based on two different approaches. In the first approach, HRSG effectiveness was compared for pre and post baffles installation. Operation data for similar reference conditions i.e., similar Gas Turbine load, ambient conditions and operating configuration was compared. If was found that the HRSG effectiveness varied with ambient conditions and GT load conditions. 

A Second approach was to evaluate the Steam Turbine power output /Gas turbine power output (ST/GT) ratio shift for similar GT loads and ambient conditions. Improvement in ST/GT ratio was also analyzed for pre & post modification and later translated into heat rate impact.  Both approaches for thermal performance evaluation resulted in similar heat rate improvement for baffle installation.

Presenting Author: Muhammad Azhar Janjua ACWA Power

Presenting Author Biography: Muhammad Adnan Saroosh has more than 18 years of experience in Power and Energy Sector and has managed multi-million value engineering projects. Adnan served ACWA Power COE for more than 3 years as a consultant appointed by GE Gas Power Engineering where he contributed towards THRMAL performance improvement of various CCPP sites. Before that, Adnan was part of GE Gas Power Engineering team under Hot & Harsh COE. Adnan’s areas of expertise are design, development and performance engineering of Heavy-duty Gas Turbines, HRSG’s, Steam turbines, CCPP, ISCC, thermal plants, CSP and Cogens. Adnan’s highest qualification is Master’s in Mechanical Engineering from Korea Advance Institute of Science &Technology (KAIST, South Korea) with Bachelor of engineering from University of Engineering & Technology (UET, Lahore, Pakistan). Adnan is a licensed Charted Engineer from Institute of Mechanical Engineers U.K., and he is also a PMP® Certified professional. Adnan has contributed towards inventions of 5 international patents and has published more than 15 international publications.

Authors:

Muhammad Adnan Saroosh ACWA Power
Muhammad Azhar Janjua ACWA Power
Jalal Hunain Zia ACWA Power
Ronald Abbas ACWA Power
Mathew York ACWA Power
Yahya Zafar ACWA POWER