ARB Research Seminar

This page updated June 19, 2013

Integrated Combined Heat and Power Using Ultra-Low-NOx Supplemental Firing

David F. Cygan, Gas Technology Institute, Des Plaines, Illinois

May 04, 2010
Cal EPA Headquarters, 1001 "I" Street, Sacramento, CA

Research Project


This seminar summarizes the activities conducted under an Innovative Clean Air Technologies grant number ICAT 05-1 from the California Air Resource Board. The objective of this project is to deploy Gas Technology Institute's (GTI's) Flexible Combined Heat and Power (FlexCHP) system to deliver power and steam while holding NOx, CO, and VOC emissions below the 2007 Fossil Fuel Emissions Standard for microturbines. The system appropriately designated a FlexCHP-65, will combine a Capstone C65 microturbine, a GTI-developed supplemental Ultra-Low-NOx (ULN) burner, and a 100 Horsepower (HP) heat recovery boiler by Johnston Boiler Company.

The supplemental ULN burner is an innovative combustion approach that promises industrial end-users a dramatic increase in energy efficiency and reduced air emissions. The efficiency of microturbine based distributed generation systems is a strong function of the ability of the system to recover and use the waste heat in the exhaust of the microturbine. The major advantages of a supplemental burner coupled with a microturbine are an increase in total system efficiency due to lowering exhaust oxygen levels from 17-18 vol.% to 3-5 vol.%, and an increase in quality of the heat produced from the microturbine exhaust. By employing auxiliary burners in the exhaust of the microturbine, the amount and temperature of the available heat will be decoupled from the amount of electricity produced. This advantage will enable more systems utilizing waste heat recovery from turbines to be designed, manufactured and sold. The developed supplemental burner has unmatched emission characteristics, which will provide a competitive edge over existing low-NOx systems in the fast developing area of CHP applications for installations where low emissions is a performance requirement.

Speaker Biography

David F. Cygan has been with Gas Technology Institute (GTI) for over 19 years, managing research activities related to the development of advanced low-emissions/high-efficiency gas-fired (natural and low-Btu fuel) combustion and heat exchange equipment. This includes low and ultra-low NOx burners for firetube and watertube boilers, process heaters, steam generators, absorption chillers, and rapid mixing fuel/air nozzles. His focus for the last several years has been with integrating combined heat and power solutions and solar-based systems to existing gas-fired applications that take advantage of the latest high-efficiency, low-cost technologies.

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