2016 7F Users Group: Issue 1

If you don't know what the "duck curve" is, you must have retired from the power industry five years ago. Simply put, it is what higher and higher penetration of renewable energy looks likes to a grid operator, who begins to have nightmares about the rising slope of the two daily ramps shown in the linked document. The image shows what the duck curve "looks" like to a combined-cycle (CC) plant filling in around the renewable capacity. Operating hours go down, starts go up, and equivalent availability suffers. more   
Gas turbine (GT) thermal efficiency increases with higher temperatures of the gas flow exiting the combustor and entering the work-producing component-the turbine. Turbine inlet temperatures in the gas path of modern high-performance jet engines can exceed 3000F, while non-aviation gas turbines typically operate at 2700F or lower. more   
Busy generator major: Three failures identified, corrected
Generator problems can be challenging to solve given the complexities of equipment design, difficulties in identifying the true root causes of failures, proper evaluation of alternative corrective actions and of alternative contractors, etc. The following case history, shared by Relu Ilie, Israel Electric Corp's (IEC) engineer in charge of powerplant electrical equipment, describes three significant issues found and addressed during the major inspection of a 35-year-old, 2-pole, 269-MVA generator. more
By invitation only: The dangers of confined space
Today's powerplants are complex engineering triumphs with attention-grabbing geometries, curious nooks and crannies, and sealed entryways. Approaching, and perhaps peering into, a not-normally-accessible area seems attractive. Going further suggests a challenge. But many plant visitors (as well as some full-time employees) may not appreciate just how dangerous these spaces can be. more 
Why the number of turbine stages, blades vary among GT models, OEMs
Turbine blades all come in the same usual shape with the only seeming variations being size and the presence of a rotating shroud or not. However, for gas turbines (GTs) of similar ratings, sometimes there are quite dramatic (if not subtle) differences. A good example-one that affects the owner/operator directly-is the number of stages in the hot section.  more 
CCJ Classifieds: Capital spares hit the market


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