GTAnalysis: History of Low IGV Settings on the 7FA

This page requires frames. Please call 510-794-5520 for assistance.  <PRE> PROPRIETARY INFORMATION: This document contains proprietary information of the author and may not be used for purposes other than that for which it was originally furnished except with written permission of the author. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The History of Low IGV Settings on the 7FA It was the mid to late 1990’s that typical 7FA IGV settings were at 88 degrees, but it’s now common to see settings anywhere from 78 to 84 degrees. The IGV modulates the airflow into the compressor resulting in more or less generation. The change occurred during the late 1990’s when miscalculations in the main quoting tool (the cycle deck) developed by the OEM occurred. The quoting tool predicted better performance than achievable. It was also a time of astronomical gas turbine sales created from the Enron high spot market power price issue. Soon the OEM realized they were exposed to millions of dollars of potential liquidated damages from coming in short of guarantee performance. The first mitigation was to overfire the unit, however, that is a risky strategy for the long term due to potential parts failures. The best example of this is a unit with an unflared compressor that has IGV’s set at 90 IGV, which would most likely be a mitigated unit with also a high firing temperature. Due to the fact that overfiring a unit is risky, the OEM opted to increase the mass flow of the compressor by opening the inlet area up. This was called the flared or snowflake compressor. With that introduction there was enough mitigation margin on many units to now reduce the IGV’s to reduce generation and still make guarantee. Without reducing IGV’s, in the OEM’s eyes, were leaving MW’s on the table when guarantees were made at the rated firing temperature. Guarantees continue to be made with a cycle deck model that is configured with an unflared compressor. Then the units are delivered and commissioned with a flared compressor resulting in extra margin to the guarantee. With the IGV reduction accompanies a firing derating. Out of this combination came the marketing bonanza, where the OEM uprates your unit back to the setting it should have been set to in the first place. Manipulating those controls has made it possible for the OEM to sell programs that corrects these low IGV settings, but at a high cost to you. GTAnalysis has come up with the GTopt, our Performance Optimization Program, that will improve performance, but at a much lower cost to you. GTopt will fix control settings that were left during commissioning, such as, the partially closed IGV’s, underfired control curves, underrated unit operation, and unmatched part load control curves. GTopt will optimize generation by increasing around 5-8 MW and decrease heat rate 40-60 Btu/Kw-Hr. Turndown will also be improved resulting in reduced parts life impact and reduced start costs. Baseload generation increase and heat rate reduction remain the predominate rate of return on investment and GTopt is the program to do just that. GTAnalysis Inc. also offers much more. We are Gas Turbine Performance Test, Monitoring, and Analysis Engineers. We provide expert precision performance testing and evaluation as well as provide engineering support. We have extensive experience in Combined Cycle, Fossil, Steam Turbine, and HRSG Performance. Our goal is to not only increase generation while reducing heat rate and fuel cost, but also to continuously monitor those changes to ensure optimal performance. A few of the services we provide include: •Controls Optimization •Control Curve Modification •Firing Curve Re-ratings •Water Injection Tuning •DLN NOx/CO Tuning Support •Peak Load Options •Inlet Conditioning Uprates (foggers, wet compression) •Wet Control Curve Uprates GTAnalysis will work closely with Construction Managers as Contract Support to find strategic opportunities in terms of capturing liquidated damages or mitigating OEM bonuses that are guaranteed by these hedged control settings and changes without your knowledge. This past year, alone, GTAnalysis is on track to reduce million$$ in OEM bonuses for three power plants. We also offer the Advanced Integrated Turbine Monitoring software. This Monitoring Program will catch failures before they become catastrophic by employing Artificial Intelligence to detect precursor failures and sort root causes. This software will evaluate compressor efficiency and flow, combustion dynamics, mechanical vibration, failure modes, turbine efficiency, and firing temperature. It will continuously monitor compressor, combustor, and turbine mechanical integrity to further provide failure protection. We welcome the opportunity to set up a time to personally speak to one of our Performance Engineering Specialists to review and discuss ways we will be able to streamline costs and increase MW output while carefully monitoring those changes. A cost benefit analysis of your particular situation can be completed to show you how quickly the payoff would be. Please feel free to contact us by phone at 941-746-5800 or through email to info@gtanalysis.com at any time. Thank you, Kenneth Boehm President 2458 Manatee Ave E Bradenton, Fl 34208 941-746-5800 Hostmaster, please convert this message to a live link to my web site, <A HREF="http://www.gtanalysis.com">http://www.gtanalysis.com</A> in the Advertise Forum archive. =================== Users-Groups.com Instructions ==================== FORUM ARCHIVE ------------- <A HREF="http://GE7FA.Users-Groups.com/Archives/Advertise/">http://GE7FA.Users-Groups.com/Archives/Advertise/</A> Username: Your Email Address Password: You defined it in the Member Profile (if not, see below) ____________________ GE7FA HOME PAGE --------------- <A HREF="http://GE7FA.Users-Groups.com/">http://GE7FA.Users-Groups.com/</A> Use the black navigation bar to access the drop down menus to manuver around the site. _________________________ GE7FA MEMBER PROFILE -------------------- Access the Member Profile via the GE7FA Home Page. Establishing a Member Profile Use method 2 if you established a Member Profile in a different User Group; otherwise, use method 1. 1) Membership | User | New Candidate 2) Membership | User | New Candidate Importing Contact Info Terminating Membership (Deleteing a Member Profile) Membership | User | Existing Member Modifications _____________________ POLICY STATEMENT ---------------- Continuing to utilize this Users-Groups.com site affirms your acceptance of the policy specified at <A HREF="http://www.Users-Groups.com/policy/">http://www.Users-Groups.com/policy/</A>. ===================================================================ui= </PRE>   </body> </html>