Science and Technology of Gases and Rational Use of Energy Group, Faculty of Engineering, University of Antioquia, Medellín, Colombia.
Bioresour Technol. 2010 Apr;101(7):2443-9. doi: 10.1016/j.biortech.2009.11.003. Epub 2009 Nov 26.
Flameless combustion technology has proved to be flexible regarding the utilization of conventional fuels. This flexibility is associated with the main characteristic of the combustion regime, which is the mixing of the reactants above the autoignition temperature of the fuel. Flameless combustion advantages when using conventional fuels are a proven fact. However, it is necessary to assess thermal equipments performance when utilizing bio-fuels, which usually are obtained from biomass gasification and the excreta of animals in bio-digesters. The effect of using biogas on the performance of an experimental furnace equipped with a self-regenerative Flameless burner is reported in this paper. All the results were compared to the performance of the system fueled with natural gas. Results showed that temperature field and uniformity are similar for both fuels; although biogas temperatures were slightly lower due to the larger amount of inert gases (CO(2)) in its composition that cool down the reactions. Species patterns and pollutant emissions showed similar trends and values for both fuels, and the energy balance for biogas showed a minor reduction of the efficiency of the furnace; this confirms that Flameless combustion is highly flexible to burn conventional and diluted fuels. Important modifications on the burner were not necessary to run the system using biogas. Additionally, in order to highlight the advantages of the Flameless combustion regime, some comparisons of the burner performance working in Flameless mode and working in conventional mode are presented.
无焰燃烧技术已被证明在常规燃料的利用方面具有灵活性。这种灵活性与燃烧方式的主要特征有关，即燃料自燃温度以上的反应物混合。使用常规燃料时无焰燃烧的优势是已被证实的事实。然而，有必要评估利用生物燃料时热设备的性能，生物燃料通常是通过生物质气化和生物消化器中动物的排泄物获得的。本文报道了在配备自再生无焰燃烧器的实验炉中使用沼气对其性能的影响。所有结果都与天然气燃料系统的性能进行了比较。结果表明，两种燃料的温度场和均匀性相似；尽管沼气温度由于其组成中大量的惰性气体（CO(2)）而略低，从而冷却了反应。物种模式和污染物排放对两种燃料表现出相似的趋势和值，沼气的能量平衡显示出炉子效率略有降低；这证实了无焰燃烧对燃烧常规和稀释燃料具有高度的灵活性。不需要对燃烧器进行重要修改就可以使用沼气运行系统。此外，为了突出无焰燃烧方式的优势，还介绍了燃烧器在无焰模式和常规模式下工作时的性能比较。
