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Characterization of the combustion of the mixtures biogas-syngas at high strain rates
Fuel ( IF 7.4 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.fuel.2020.117580
Rima Zouagri , Abdelbaki Mameri , Fouzi Tabet , Amar Hadef

Abstract Applying gasification on the residue generated by the biogas process would increase flexibility and efficiency of waste treatment plants while leading to a simultaneous production of biogas and syngas. Existing electricity conversion systems at biogas and gasification plants are usually designed to operate with a single bio-fuel (biogas/syngas). It is, hence, necessary to identify the combustion characteristics of these blended fuels in order to implement them efficiently in the existing systems. The aim of this work is to characterize the structure and emission of mixtures of biogas and syngas in counter-flow flame configuration at laminar regime. Particular attention is paid to the chemical effects of CO2 contained in the biogas and radiative heat losses of the flame. Several compositions of biogas and syngas have been considered in the fuel mixture. The results show that the flame properties are very sensitive to fuel composition. An increase in the volume of methane in the biogas or hydrogen in the syngas improves the Low Heat Value (LHV) of the fuel. Moreover, the addition of a volume of syngas exceeding half of that of biogas allows a reduction of harmful emissions while maintaining a constant level of operating temperature. At the flame front, the NO species is found to be governed by thermal route whereas it is generally produced by prompt path before and after the flame front. In addition, the chemical effect of CO2 reduces the maxima of temperature and emission. This effect remains constant in the syngas mixtures while it is very sensitive to biogas composition where it decreases with the amount of CH4 in biogas.

中文翻译:

沼气-合成气混合物在高应变率下的燃烧特性

摘要 对沼气过程产生的残渣进行气化将提高废物处理厂的灵活性和效率,同时实现沼气和合成气的同步生产。沼气和气化厂现有的电力转换系统通常设计为使用单一生物燃料(沼气/合成气)运行。因此,有必要确定这些混合燃料的燃烧特性,以便在现有系统中有效地实施它们。这项工作的目的是表征层流状态下逆流火焰配置中沼气和合成气混合物的结构和排放。特别注意沼气中所含 CO2 的化学作用和火焰的辐射热损失。在燃料混合物中已经考虑了沼气和合成气的几种成分。结果表明,火焰特性对燃料成分非常敏感。沼气中甲烷或合成气中氢气的量增加可改善燃料的低热值 (LHV)。此外,添加超过沼气一半的合成气可以减少有害排放,同时保持恒定的工作温度水平。在火焰前沿,发现 NO 物种受热路径控制,而它通常由火焰前沿前后的快速路径产生。此外,CO2 的化学效应降低了温度和排放的最大值。
更新日期:2020-07-01
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