Spatially-Resolved experimental investigations of combustion characteristics in a solid fuel doped methane swirl flame and the influence on the formation of ultrafine particulate matter
Spatially-Resolved experimental investigations of combustion characteristics in a solid fuel doped methane swirl flame and the influence on the formation of ultrafine particulate matter
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DOI：
10.1016/j.combustflame.2022.112223
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发表时间：
2022
影响因子：
4.4
通讯作者：
C. Axt;A. Massmeyer;S. Pielsticker;R. Kneer
中科院分区：
文献类型：
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作者：
C. Axt;A. Massmeyer;S. Pielsticker;R. Kneer
可吸入细颗粒（dp≤10µm）的形成是固体燃料燃烧过程中不希望出现的副作用。这些颗粒可在人体呼吸系统中积聚，从而造成严重的肺损伤。因此，了解这些颗粒的形成对于避免或减少细颗粒物（PM）释放到大气中至关重要。到目前为止，大多数研究都是针对简化条件下的层流和早期固体燃料燃烧（如径向几乎均匀条件下的扁平火焰燃烧器），而对更复杂的湍流火焰结构进行的研究很少。由于工业规模上的大多数实际应用都涉及湍流条件，因此该领域的研究非常重要。为了研究颗粒物质的形成，开发了一种旋涡甲烷辅助粉末固体燃料燃烧试验台，该试验台具有全光学通道，可以在不同高度和径向位置进行侵入式和非侵入式测量。为了研究火焰特性对超细颗粒形成的局部影响，给出并讨论了激光多普勒测速仪（LDV）、吸力高温计、傅里叶变换红外光谱（FTIR）和扫描迁移率粒度仪（SMPS）的测量结果。结果表明，气体温度、固体燃料颗粒速度和浓度种类等局部差异对颗粒物质的形成有影响。特别是在具有高局部速度和剪切带的区域，由于该区域湍流的增加，PM凝结强烈。本文提供的数据为进一步研究利用测量结果验证CFD模拟以及进一步开发现有湍流情况下的PM形成模型奠定了重要基础。
The formation of inhalable fine particles (d p≤ 10 µm) is an undesirable side effect of solid fuel combustion processes. These particles can accumulate in the human respiratory system and thus cause severe lung damage. Therefore, an understanding of the formation of these particles is of crucial importance to avoid or to reduce the amount of fine particulate matter (PM) released into the atmosphere. Until now, most of the studies have been carried out for laminar and early-stage solid fuel combustion under simplified conditions (eg flat flame burner with radial almost homogeneous conditions) and only a few studies have been carried out with more complex turbulent flame structures. As the majority of real applications on an industrial scale involves turbulent conditions, research in this area is highly important. For the investigation of particulate matter formation, a swirled methane-assisted pulverized solid fuel combustion test rig with full optical access which allows intrusive and non-intrusive measurements in different heights and radial positions was developed. In order to study the local influences of flame characteristics on the formation of ultrafine particulate matter, results from laser Doppler velocimetry (LDV), suction pyrometer, Fourier transform infrared (FTIR) spectroscopy, and scanning mobility particle sizer (SMPS) spectrometer measurements are presented and discussed. It is shown that the local differences-such as gas temperature, the velocity of the solid fuel particles, and concentrations species-have an influence on the formation of particulate matter. Especially in regions with high local velocities and shear zones, PM coagulates strongly due to the increased turbulence in this area. The data presented in this paper are an important foundation for further studies to validate CFD simulations using the measurements and to further develop existing PM formation models for turbulent cases.