July 2003

Special Report: Plant Utilities/Heat Transfer

How emissions affect HRSGs

Here’s how NOx and CO control methods influence designs

Ganapathy, V., Consultant

Over the past 10 to 15 years, emissions regulations have had a great impact on design of gas turbine HRSGs. In addition to recovering energy from turbine exhaust gases, today's HRSG designs must also accommodate NOx and CO reduction devices to meet stringent emissions regulations. NOx and CO have been regulated to single digits, less than 2.5 parts per million volume dry (ppmvd) in some locations. Catalysts are widely used in HRSGs to limit these emissions. Advanced low-NOx combustors and methods such as water or steam injection in the combustor are also used to minimize NOx emissions. All these measures impact th

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