Modeling Study of Burner and Furnace Performance for Oxygen Enriched Combustion Systems

摘要

A 2-D finite difference model was applied to investigate the effects of O2 enrichment and combustion with pure oxygen on performance of two burners in two different pilot-scale furnaces fired with natural gas. The predictions yielded not only data on overall heat transfer performance depending on burner type and operating conditions, but also allowed a detailed analysis of the interaction between combustion and burner and furnace aerodynamics. Predictions of gas temperature distributions and refractory surface temperatures were compared to corresponding measured distributions. In all cases predicted performance followed the measured trends. Predictions and measurements clearly show that, by adjusting the thermal input, combustion with enriched air or pure O2 can be applied with a minimum change in furnace gas temperature distribution and refractory temperatures. However, in spite of the considerable increase in efficiency, absolute heat transfer is somewhat reduced for same peak refractory temperatures. Predictions and measurements showed a moderate scale effect on performance for both burner types studied which is primarily attributed to different refractory wall characteristics of the two furnaces. The modeling study allowed a valuable insight into the oxygen flame behavior. The knowledge gained will be used in Phase II of the DOE project, in which full scale furnace performance for oxy-fuel flames will be investigated. 7 refs., 16 figs., 3 tabs. (ERA citation 13:053095)