The numerical modeling and simulation of the highly preheated and diluted air combustion furnaces

This paper presents some of the predicted results of the modeling and simulation of an industrial furnace; under the conventional combustion (air with 21% O2 and the ambient temperature and/or 1000 oC) and under the highly preheated and diluted air combustion "HPDAC" (air with 10% O2 and 1000 oC) conditions, using a computer program written by authors in FORTRAN language. The comparison of the simulation results between the conventional combustion and HPDAC shows that, the HPDAC applied to industrial furnace offers the more uniform and relatively moderate gas temperature profile and thus the reduction of NOX pollutant formation, a larger flame and therefore the lower maximum local heat release rate. Totally, we will have a system with the higher thermal performance and so the lower fuel or energy consumption, that translates the suppression of CO2 pollutant emission to the environment. The HPDAC technology also can result in smaller chamber size for processing the same material or increasing productivity for the same furnace size. Finally, in this paper a modified concept has been proposed and applied for defining of the chemical flame size.

Keywords:

furnace modeling , simulation , combustion , highly preheated and diluted air