利用非均质部分预混合分层火焰提高不同二氧化碳浓度下沼气的燃烧稳定性

IF 1.9 Q4 ENERGY & FUELS Global Energy Interconnection Pub Date : 2024-08-01 DOI:10.1016/j.gloei.2024.08.008
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引用次数: 0

摘要

沼气是一种可再生的清洁能源,在当前低碳转型的大环境下发挥着重要作用。如果能将沼气中的高浓度二氧化碳分离、转化和利用,不仅能实现沼气的高值化利用,还能促进沼气领域的碳减排。为了提高沼气的燃烧稳定性,本研究采用了非均质、部分预混分层(IPPS)燃烧模型。在同心流槽燃烧器(CFSB)中,研究了各种混合物不均匀度、湍流水平、二氧化碳浓度、空气与燃料速度比和燃烧能量下的热火焰结构和稳定性。细线热电偶用于解析热火焰结构。随着二氧化碳浓度的增加,火焰尺寸减小,火焰颜色变浅。火焰温度也随着二氧化碳浓度的增加而降低。火焰稳定性随着二氧化碳浓度的增加而降低。然而,在混合物不均匀度达到一定程度时,IPPS 模式下的二氧化碳浓度不会影响稳定性。因此,IPPS 燃烧模式应适用于沼气的燃烧和稳定。这将有助于设计与二氧化碳浓度无关的高度稳定的沼气湍流火焰。数据显示,稳定性较低的条件部分是由于燃料燃烧能量的变化造成的,这种变化以沃伯指数(WI)为特征。此外,在混合物不均匀度达到一定程度时,WI 对火焰稳定性的影响会变得非常重要。
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Improved combustion stability of biogas at different CO2 concentrations using inhomogeneous partially premixed stratified flames

Biogas is a renewable and clean energy source that plays an important role in the current environment of low- carbon transition. If high-content CO2 in biogas can be separated, transformed, and utilized, it not only realizes high-value utilization of biogas but also promotes carbon reduction in the biogas field. To improve the combustion stability of biogas, an inhomogeneous, partially premixed stratified (IPPS) combustion model was adopted in this study. The thermal flame structure and stability were investigated for a wide range of mixture inhomogeneities, turbulence levels, CO2 concentrations, air-to-fuel velocity ratios, and combustion energies in a concentric flow slot burner (CFSB). A fine-wire thermocouple is used to resolve the thermal flame structure. The flame size was reduced by increasing the CO2 concentration and the flames became lighter blue. The flame temperature also decreased with increase in CO2 concentration. Flame stability was reduced by increasing the CO2 concentration. However, at a certain level of mixture inhomogeneity, the concentration of CO2 in the IPPS mode did not affect the stability. Accordingly, the IPPS mode of combustion should be suitable for the combustion and stabilization of biogas. This should support the design of highly stabilized biogas turbulent flames independent of CO2 concentration. The data show that the lower stability conditions are partially due to the change in fuel combustion energy, which is characterized by the Wobbe index (WI). In addition, at a certain level of mixture inhomogeneity, the effect of the WI on flame stability becomes dominant.

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来源期刊
Global Energy Interconnection
Global Energy Interconnection Engineering-Automotive Engineering
CiteScore
5.70
自引率
0.00%
发文量
985
审稿时长
15 weeks
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