Inscrição na biblioteca: Guest

ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

FURNACE COMBUSTION AND HEAT TRANSFER IN LARGE UTILITY BOILERS

Get access (open in a dialog) DOI: 10.1615/IHTC11.2780
pages 301-323

Resumo

The combustion of fossil fuels in a utility furnace is a complex process involving turbulent gas dynamics, multiphase solids-gas flow, chemical reactions, radiative and convective heat transfer, and pollutant formation. With the passage of the 1990 Clean Air Act Amendments in the United States Congress, "traditional" ways of designing furnaces based on semi-empiricism are being revised with the aid of comprehensive analytical methods based on fundamental principles. These new analytical methods are utilized for furnace designs which accommodate modern pollution abatement technologies such as low NOx burners, staged/overfire air, flue gas recirculation, and reburning. This paper presents the current status of technology practiced by the boiler manufacturers for the predictions of furnace performance based on theoretical principles. Mathematical formulations for the various combustion and heat transfer processes and general numerical solution techniques are presented, followed by example cases for tangentially-fired, front wall-fired, front and rear wall-fired, cyclone-fired, and arch-fired furnaces. Limitations of the current knowledge bases and future research areas are indicated throughout the paper.