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首页> 外文会议>Clearwater clean coal conference;International technical conference on clean energy >Early Stage Sub-micron Particle Formation During Pulverized Coal Combustion in Two-stage Flat Flame Burner
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Early Stage Sub-micron Particle Formation During Pulverized Coal Combustion in Two-stage Flat Flame Burner

机译：两级平面火焰燃烧器粉煤燃烧过程中的早期亚微米颗粒形成

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In pulverized coal burners, coal particles transition from a short period of locally reducing environment, caused due to the fast release of volatiles from a dense region of coal particles, to an oxidizing environment. This "reducing-to-oxidizing" transition can influence combustion processes such as ignition, particulate formation, and char burnout. Traditionally, fundamental studies on coal combustion have been conducted in systems which neither capture the "reducing-to-oxidizing" transition nor the high a heating rate of practical combustors. In this work the formation and evolution of sub-micron particles is investigated in a novel two-stage flat flame burner that simulates the "reducing-to-oxidizing" transition and with heating rates on the order of 10~5 K/s. The particle size distribution (PSD) of the sub-micron particles, and their composition are measured using SMPS and SEM-EDX, respectively. Measurements are carried out under both an oxidizing environment (20% oxygen) and a "reducing-to-oxidizing" environment at two different nominal gas temperatures (1300 K and 1800 K), and three residence times (15, 30 and 60 ms). To differentiate between soot and mineral matter, the SMPS is operated in a tandem fashion, with a high temperature furnace between the two SMPS measurement locations. The furnace is supplied with a sufficient amount of oxygen to burn off soot in the sampled aerosol stream. The results, including the difference between the oxidizing and reducing-to-oxidizing environments, will be discussed.
机译：在煤粉燃烧器中，由于挥发性物质从煤颗粒的稠密区域快速释放而导致，煤颗粒从短期的局部还原环境过渡到氧化环境。这种“还原到氧化”的转变会影响燃烧过程，例如着火，形成颗粒和烧焦。传统上，对煤燃烧的基础研究是在既没有捕获“还原到氧化”转变，又没有获得实用燃烧器的高加热速率的系统中进行的。在这项工作中，在新型的两级平面火焰燃烧器中研究了亚微米颗粒的形成和演化，该燃烧器模拟了“还原至氧化”的转变，加热速率为10〜5 K / s。使用SMPS和SEM-EDX分别测量亚微米颗粒的粒径分布（PSD）及其组成。在两个不同的标称气体温度（1300 K和1800 K）和三个停留时间（15、30和60 ms）下，在氧化环境（20％氧气）和“还原氧化”环境下进行测量。为了区分煤烟和矿物，SMPS串联运行，在两个SMPS测量位置之间装有高温炉。向熔炉供应足够量的氧气，以燃烧掉采样气溶胶流中的烟灰。将讨论结果，包括氧化环境和还原氧化环境之间的差异。

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