Application Of Fuel lean gas Reburn Technology at Commonwealth Edison's Joliet generating Station 9

摘要

This paper presents the preliminary results of the first ful-scale application of Fuel Lean Gas Reburn (FLGR) in a cyclone fired boiler. Fuel lean Reburn was installed on a 340 MW cyclone-fired utility boiler at ComEd's Joliet Generating Station Number 9. Fuel Lean Reburn involves the injection of 3-7percent natural gas heat input via turbulent jets into the upper furnace of fossil-fueled boilers while maintaining an overal fuel lean furnace, thereby preventing excessive carbon monoxide emission and eliminating the need for downstream completion air as employed in conventional gas reburning technology. The controlled dispersion of natural gas into high NO_x regions downstream of the primary combustion zone is designed to create locally fuel rich zones or eddies in which NO_x reburning can take place while maintaining an overall fuel lean furnace environment. The Fuel Lean Reburn shows the potential to achieve better than a 40percent reduction in NO_x emissions using 7percent gas heat input or less. With the elimination of downstream completion air and the use of less gas heat input than with conventional gas reburning systems, Fuel Lean Reburn systems offer lower capital and operating costs than conventional reburn systems with a moderate decrease in the NO_x control potential. A Fuel Lean Reburn system was installed on Joliet Unit 6 in the Spring of 1997 with parametric and long-term performance testing taking place in the Summer of 1997. This project is sponsored by comEd and the Gas Research Institute.