Impact of Startup Purge Credit on Combined Cycle Plant Operation

Normal boiler and Heat Recovery Steam Generator Operation have required a complete purge of the boiler by fresh air before startup firing to remove potentially explosive fuels and other substances from the boiler/HRSG. For power plants in daily two-shift cycling (or more frequent starts) this not only adds time to the startup sequence but can impose significant thermal stresses on hot components exposed to cooler purge air. 

Read more: Impact of Startup Purge Credit on Combined Cycle Plant Operation

2019 Summer Power Seminars

On the French Riviera, June 10-14, 2019

Partners: TG Advisers, USA; Prof. B Leckner, Chalmers University of Technology

A unique opportunity to update your knowledge on your power plant’s Capital Equipment. Hear from industry-leading experts on Gas Turbines, HRSGs, Fluidised Bed Boilers and Steam Turbines. Sharpen your skills with the latest information on inspecting, analysing and maintaining your critical power generation assets.

Tetra Engineering has partnered with turbine experts TG Advisers Inc., and Fluidised Bed Boiler expert Prof. B. Leckner (Chalmers University of Technology, Sweden) to deliver a comprehensive course set, targeted at O&M engineers with critical technical responsibilities. The programme will run as follows:

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Power Plant Simulator & Designer Package (PPSD) Version 19.1.

Tetra Engineering and KED are pleased to announce the release of the Power Plant Simulator & Designer Package (PPSD) Version 19.1. PPSD is a state of the art design and analysis/troubleshooting package for nearly any type of thermal power plant. It includes the capability for both steady state and dynamic simulation and analysis and is developed by KED in Germany. 

Read more: Power Plant Simulator & Designer Package (PPSD) Version 19.1.

Grade 91 Piping Risk Assessment

Higher demands on outlet steam conditions has led to increased use of modified low alloy materials (9-12% Cr), such as Grade 91. The superior high temperature material properties of these types of steels (strength, fatigue resistance, creep resistance, improved steam oxidation resistance) gives the designer advantages with respect to boiler reliability and thermal performance. The advantages of using this type of materials are many; however, the long-term integrity has been a concern to the industry ever since the first installations.

Read more: Grade 91 Piping Risk Assessment

HRSG Inspections - The Key to Reliability

At Combined Cycle Power Plants the Heat Recovery Steam Generator (HRSG) is an easily-overlooked, but key component, providing steam to the steam turbine and to attached process steam hosts.  While base-loaded HRSGs tend to be the most reliable - cycled or two-shifted plants suffering from accelerated damage - the importance of allocating sufficient resources to maintenance of the HRSG is often only realised in hindsight. 

Read more: HRSG Inspections - The Key to Reliability