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Show GAS COFIRING FOR PERFORMANCE IMPROVEMENT AND EMISSIONS REDUCTION IN STOKER BOILERS L. R. Waterland ARCADIS Geraghty & Miller, Inc. 555 Clyde Avenue Mountain View, California 94043 H. B. Mason Acurex Energy 555 Clyde Avenue Mountain View, California 94043 R. V. Gemmer GRI 8600 W . Bryn Mawr Avenue Chicago, Illinois 60631 S. A. Drennan Coen Company Inc. 1510 Rollins Road Burlingame, California 94010 ABSTRACT Cofiring a small amount of gas in solid-fuel fired boilers is an efficient and economical way to resolve of emissions and performance problems. GRI has developed and demonstrated a specialized cofire retrofit package featuring dual, opposed, high pressure drop gas burners to control the combustion over the solid fuel. Earlier demonstrations on coal-fired stokers have shown cofire to reduce emissions, enhance performance, increase efficiency and lower operating costs. In the present work, the cofire package has been applied to another eight coal-fired stoker boilers at five sites. At the first site, cofire reduced particulate up to 60 percent for 20 percent gas firing. At the second site, gas cofire was used to reduce N O x emissions by 20 percent for 20 percent cofire. At the third site, cofire achieved 15 percent N O x reduction for 10 to 15 percent cofire, and allowed routine smokeless startup and load ramping. At the fourth site, cofire allowed the recovery of formerly derated 20 percent of boiler capacity with 10 percent cofire. At the fifth, 7 percent cofire allowed a flue gas recirculation system formerly needed for opacity control to be disconnected. 1 |
