By Vignesh Bala, Vogt Power Editor’s note: This is the second of three articles exploring the impacts of gas-turbine upgrades on heat-recovery steam generators. It focuses on “re-rating” of the HRSG after the upgrade to extract maximum benefit from the work. Part 1, which examined the driving factors behind GT upgrades, appeared in August. Part […]
HRSG need not be a limiting factor in GT upgrade Read More »
The city of Ottawa’s gas-turbine-powered combined cycle was honored as an Historic Mechanical Engineering Landmark by the American Society of Mechanical Engineers, Sept 13, 2024, in a special ceremony conducted in the Ottawa Memorial Auditorium. Dave Hunsaker, electric superintendent for the city, accepted the award from ASME Fellow Jared Oehring, a member of the society’s
GAS TURBINES: ASME accords Kansas combined cycle Historic Landmark status Read More »
By Steven C Stultz, Consulting Editor The seventh annual International Conference on Film Forming Substances (FFS), conducted in Prato, Italy, March 26-28, 2024, was developed and supported by the International Association for the Properties of Water and Steam (IAPWS). The meeting drew 50 participants from 16 countries—including 10 plant owner/operators and representatives from a dozen
FILM FORMING SUBSTANCES: Conference focuses on research required to advance use of FFS Read More »
Legacy Turbine Doctor, No. 2 in a series By Luke Williams, PE, Consultant www.geLegacyGasTurbineSupport.com An MS7001B engine with Mark I Speedtronic™ controls failed to start reliably for about a year. Failure-to-start causes included loss of flame, trip at Complete Sequence to full-speed/no-load (FSNL), trip on 95% speed (14HS), TNH (high-pressure shaft speed) bog-down, and unknown.
Persistence key to finding gremlin impacting starting reliability Read More »
By Vaughn Watson, Vector Systems Inc The efficiency and long-term performance of an SCR depends largely on several key design considerations regarding various system components. When complex NOₓ reductions on combined cycles are required, there are critical values related to the fluid distribution in the system which must be addressed to ensure success. While the
EMISSIONS CONTROL: How exhaust-gas distribution can affect SCR performance Read More »
Next meeting: Nov 12-14, 2024 • EPRI Campus • Charlotte, NC Inquiries: ACGTUG@epri.com • Details at www.epri.com/events Welcome the latest addition to the worldwide gas-turbine user community: The Advanced Class Gas Turbine Users Group. It was formed by EPRI to focus on issues common to the M501G, M501J, SGT6-6000G, SGT6-8000H, SGT6-9000HL, and other advanced frames
Tube leaks in heat-recovery steam generators certainly are not rare. CCJ has published many articles on the subject over the years—including one in the first issue (Q4/2003) that touted the benefits of full-penetration welds in HRSG tube panels to improve fatigue life. That said, why should you read yet another article on tube leaks, these
HRSG REPAIRS: A tale of two tube leaks Read More »
By Guillaume GROGNET, Maintenance Mechanical Manager, Electricité de France Bouchain CCGT, operated by Electricité de France (EDF), in Northern France was commissioned in July 2016 and has accumulated over 45k operating hours and 650 GT factored starts as of Q4/2023. Due to European grid code and recent grid operation modifications, French and European CCGTs operate
Case studies on HP economizer tube leaks at Bouchain CCGT Read More »
The COMBINED CYCLE Journal and the steering committees of the industry’s leading users groups—including 7F, 501F, 501G, 7EA, HA, Western Turbine, CCUG, STUG, GUG, PPCUG, Frame 6B, Frame 5, 501D5-D5A, AOG, and V—collaborate to expand the sharing of best practices and lessons learned among owner/operators of large frame and aeroderivative gas turbines. Twenty-eight plants listed
Five plants earn Best of the Best honors in CCJ’s 20th annual Best Practices Awards Read More »
“Mastering Desuperheating and Attemperation,” Ory Selzer, IMI Insyt Almost 200 slides long, this presentation could serve as a comprehensive training course on what can and does go wrong with two of the most vexing subsystems in the steam cycle, as well as solutions. Instructor sets the stage with numerous photos of component failures (Fig 6),
Combined Cycle Users Group: 2023 vendor presentation recaps Read More »
