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Gas Turbine Combined Cycle Fast Start: The Physics Behind the Concept
GTCC startup optimization is essentially minimizing the time required to reach the dispatch power (e.g., full load or a specific part load) without "breaking anything" in the process. For example, failure to control thermal stresses results in cracks via low/high cycle fatigue (LCF and HCF) and brittle fracture. This article provide relevant and easy-to-use technical information (in the form of simple charts, basic equations and representative physical quantities) to form an informed opinion on available technologies for GTCC startups.
Revision Date: 6/3/2015
Tags: 221112 - Fossil Fuel 化石燃料, Bechtel, Gas Turbine, Optimization, Fast Start, Power Engineering
Cost Benefits of Critical Valve Repair in the Heat Recovery Steam Generator
Modern advance frame combined-cycle power facilities operate in a dispatch environment where cold starts, accelerated ramp rates and low load conditions are the norm and where Balance of Plant (BOP) equipment accounts for more than half of all forced outages. An analysis by Pentair revealed that valves are a significant contributing factor in forced outages, primarily based on their application numbers and the severity of their service applications. This article focuses on small bore vent valves and drain valves, reporting research findings that repairing these valves is more prudent and economical than replacing them.
Revision Date: 6/3/2015
Tags: 221112 - Fossil Fuel 化石燃料, Pentair, Heat Recovery Steam Generator, Valve, Life Cycle Cost, Optimization, Service & Repair, Heat Recovery, Fast Start, Power Engineering
How to Design, Retrofit Drum-type HRSGs to Cycle, Start Faster
Fast start and fast ramp of HRSGs in necessary in order to back up renewables when the wind stops or clouds appear. Fast starts/fast ramps also reduce the total emissions during a start, cut startup costs, and enable the plant to achieve full-load revenues faster. This article summarizes a presentation regarding the design and retrofit of HRSGs in order to optimize fast starts and fast ramps.
Revision Date: 6/3/2015
Tags: 221112 - Fossil Fuel 化石燃料, Vogt Power International, Heat Recovery Steam Generator, Optimization, Heat Recovery, Fast Start, Combined Cycle Journal
Fast-Start HRSG Life-Cycle Optimization
Modern heat recovery steam generator (HRSG) design must balance operating response with the reduction in life of components caused by daily cycling and fast starts. Advanced modeling techniques demonstrate HRSG startup ramp rates can be accelerated without compromising equipment life.
Revision Date: 6/3/2015
Tags: 221112 - Fossil Fuel 化石燃料, Foster Wheeler, Heat Recovery Steam Generator, Life Cycle Cost, Optimization, Heat Recovery, Fast Start, Power Magazine