Comparison between combustion characteristics, radiation and thermal efficiency of a free flame and a metal fiber cylindrical burner in a residential gas furnace
摘要
In this study, the performance of a free flame burner and a metal fiber burner installed in a gas furnace was experimentally investigated. Results showed that the metal fiber burner has a 9% wider flammability range. Using the metal fiber burner instead of the free flame burner increased the thermal efficiency of the furnace by 8%, decreased the emissions of NOX by 22 ppm, but increased the emissions of CO by 190 ppm. The characteristics of the metal fiber burner in terms of temperature distribution, radiation efficiency, and operating range were extensively studied by experiments. Based on the DOE approach and signal-to-noise analysis, it was found that the target variables “thermal efficiency” and “CO emission” are mostly influenced by “equivalence ratio” and “firing rate” with 77% and 61% impact, respectively, and the target variable “NOX emission” is almost equally influenced by both of these factors.