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Smart Starts Mitigate HRSG Damage, Preserve Reliability

A smart start is one that is able to fulfill these three goals: 1) Avoid damage and preserve reliability (more specifically, minimize damage from thermal stress and overheating); 2) Permit rapid loading of the gas turbine; and 3) Provide steam at the proper flow rate and temperature to the steam turbine.

Revision Date:  7/20/2015

Tags:  221112 - Fossil Fuel 化石燃料, HRST, Heat Recovery Steam Generator, Attemperator, Economizer, Thermal Shock, Startup, Maintenance, Combined Cycle Journal

How to Reduce the Startup Time of a Legacy Combined Cycle

Legacy HRSGs in service may restrict or limit the plant startup rate, but some possible upgrades can reduce the amount of time it takes to bring a combined cycle online. This article discusses three options: steam sparging, controlling the HP-drum termperate ramp rate independently of the gas turbine startup rate be venting steam, and lay-up practices.

Revision Date:  7/20/2015

Tags:  221112 - Fossil Fuel 化石燃料, HRST, Heat Recovery Steam Generator, Startup, Combined Cycle Journal

Align SCR Start/Stop Sequence with GT Fast-Start Sequence

The gas turbines at the Turlock Almond Plant in California were designed for 10-minute start capability, but sub-controls for the emission reduction systems were not. This case study reviews necessary changes that were made to the controls in the Ovation balance-of-plant distributed control system (DCS).

Revision Date:  6/26/2015

Tags:  221112 - Fossil Fuel 化石燃料, Distributed Control System, SCR, Fast Start, Startup, Combined Cycle Journal, USA

Don't Let Startup Emissions Slow You Down

In a Power Enginerring article, the authors point out that new combustion turbine (CT) simple and combined-cycle plants face new challenges in permitting because of more stringent startup emission limits. Recent permits issued in a variety of jurisdictions have included limits on startup emissions, both in mass per start and rolling annual startup mass limits for VOC, NOx and CO. The increased use of heavy duty/frame CTs for peaking applications create additional challenges. Startup and shutdown durations and emissions rates vary widely depending on CT model and other plant equipment and design choices. Bob Mcilvaine President, Mcilvaine Company 847 784 0012 ext 112 www.mcilvainecompany.com rmcilvaine@mcilvainecompany.com

Revision Date:  12/23/2013

Tags:  221112 - Fossil Fuel 化石燃料, Kiewit, Gas Turbine, Permitting, Startup, Power Engineering