Optimization of design and oepration of premixed burners by full kinetic modeling

摘要

In modern residential gas appliances more and more fully premixed gas burner systems are used,because combustion occurs with a very low emissin evle.the pollutant emission (CO and NO_x) and temperature profiles of these systems can be simulated quantitatively by modified flame modeling codes for premixed one-dimensional flat flames,originating in purely academic flame research,because premixed flames of modern burners have similar flow ocnfigurations.Developers of gas appliances can benerfit of presented simulation results,which could describe interesting aspects like the gas temperature profile in the combustion cvhamber,the burner surface temperature,the input temperature into the heat exchanger,the raditing heat transfer between burner,heat exvhanger and gas volume,the CO concentration profiile especially to evaluate the necessary combustion chamber length and the NO concentration profile and emission level.Gas phase and surface temperatures and pollutant emissions are mainly in fluenced by the specific burner surface loading,the air ratio and the fuel gas composition.