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An experimental study of the effects of asphaltenes on heavy fuel oil droplet combustion

机译：沥青质对重油滴燃烧影响的实验研究

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Experiments of isolated heavy fuel oil droplets containing high asphaltene concentrations were carried out by the captive droplet technique. High-resolution video methods were used to monitor the transients experienced by the burning droplets. The suspended droplets confined in a highly radiative oxidizing environment were exposed to a maximum heating rate of 1000 deg C/s. Data on size and temperature histories were obtained for different initial droplet diameters. A critical artificial lower bound for ignition time delay was determined by applying classical thermal theory to the monitored temperature histories. The ignition temperatures so predicted were comparable in magnitude to the observed values within experimental uncertainty. The occurrence of disruptive boiling, swelling, splashing and the formation of coke were clearly identified by three characteristic combustion times. Under the experimental conditions to which the droplets were subjected, disruption behavior was found to be attributed to the volatility differential of the high asphaltenic fuels rather than the presence of the suspended fiber. Coking of these asphaltenic fuels was accompanied by a dramatic eruption effect during the last moments of the droplet lifetime when the molecular structure of the cenosphere is molded. Excess burnout time or the ratio of burnout time of a high to a low asphaltenic fuel oil was strongly dependent on the initial droplet diameter. The experimental results strongly indicate that less oxidation time was required for coke particles that were low in asphaltenes. In boiler and furnace operation this means that greater residence times are required to oxidize conospheric residues if the heavy fuel oils have a substantial asphaltene content compared to droplets of the same size but with less aromaticity.
机译：通过俘获液滴技术进行了分离的含有高沥青质浓度的重质燃料油液滴的实验。高分辨率视频方法用于监视燃烧的液滴经历的瞬变。限制在高辐射氧化环境中的悬浮液滴暴露于1000℃/ s的最大加热速率。获得了不同初始液滴直径的尺寸和温度历史数据。通过将经典热理论应用于监测的温度历史记录，确定了点火延迟的临界人工下限。在实验不确定性范围内，如此预测的点火温度在大小上可与观测值相媲美。通过三个特征燃烧时间可以清楚地识别出破坏性沸腾，溶胀，飞溅和焦炭的形成。在液滴经受的实验条件下，发现破坏行为归因于高沥青质燃料的挥发性差异，而不是悬浮纤维的存在。这些沥青质燃料的焦化过程伴随着液滴寿命的最后一刻，即当形成空心层的分子结构时，喷发效果显着。过量的燃尽时间或高沥青质燃料油与低沥青质燃料油的燃尽时间之比在很大程度上取决于初始液滴直径。实验结果强烈表明，沥青质含量低的焦炭颗粒所需的氧化时间更少。在锅炉和熔炉操作中，这意味着如果重质燃料油与相同大小但具有较少芳香性的液滴相比具有大量的沥青质，则需要更长的停留时间来氧化对流层残余物。

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