Impact of Startup Purge Credit on Combined Cycle Plant Operation

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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. 

2019 Summer Power Seminars

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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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Grade 91 Piping Risk Assessment

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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.

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

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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. 

HRSG Inspections - The Key to Reliability

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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. 

HRSG Inspection Planning Guide

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Inspection is part of routine maintenance for any Heat Recovery Steam Generator (HRSG).  Visual inspections are performed at regular intervals in accordance with the requirements of regulatory bodies and insurers.  In the US statutory inspections are mandated typically every year although some jurisdictions allow justification for longer intervals.   Additional inspections are sometimes performed to establish the baseline condition of the HRSG (often early in life, but not always) or to perform less frequent special inspections to confirm component integrity. 

Using Thermohydraulic Simulations to Assess HRSG Performance

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Thermohydraulic simulations can provide detailed heat recovery steam generator (HRSG) data to help determine the root cause of failures, predict the degree of wear from various mechanisms, and assess the overall thermal efficiency of the boilers. In this article, the results obtained from three case studies are presented to show the real-world benefits obtained through thermodynamic simulations.

Tetra Marks 25 Years Responding to the Needs of Combined Cycle Plant Owners

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We have solutions to your HRSG, Boiler and Power Piping Problems

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About Us

Established in 1988, Tetra Engineering has more than 25 years experience providing solutions to the power industry. We specialize in solutions for HRSGs, conventional boilers & steam-cycle balance of plant.

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Our Locations

Offices in: Connecticut, USA; Nice, France; Dubai, UAE.