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首页> 外文期刊>Journal of the air & waste management association >Fine and Ultrafine Emission Dynamics from a Ferrous Foundry Cupola Furnace
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Fine and Ultrafine Emission Dynamics from a Ferrous Foundry Cupola Furnace

机译：黑色铸造冲天炉的精细和超细排放动力学

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Aerosol size distributions from ferrous foundry cupola furnaces vary depending on semicontinuous process dynamics, time along the tap-to-tap cycle, dilution ratio, and the physical and chemical nature of the charge and fuel. All of these factors result in a highly time-dependent emission of particulate matter (PM) 2.5 μm or less in aerodynamic diameter (PM_(2.5))-even on a mass concentration basis. Control measures are frequently taken on the basis of low-reliability parameters such as emission factors and loosely established mass ratios of PM_(2.5) to PM 10 μm or less in aerodynamic diameter (PM_(10)). The new environmental requirements could entail unexpected and undesired drawbacks and uncertainties in the meaning and effectiveness of process improvement measures. The development of process-integrated and flue-gas cleaning measures for reduction of particle emissions requires a better knowledge of generation mechanisms during melting. Available aerosol analyzers expand the range of control issues to be tackled and contribute to greatly reducernthe uncertainty of engineering decisions on trace pollutant control. This approach combines real-time size distribution monitoring and cascade impactors as presepara-tors for chemical or morphological analysis. The results allow for establishing a design rationale and performance requirement for control devices. A number size distribution below 10 μm in aerodynamic equivalent diameter was chosen as the main indicator of charge influence and filter performance. Size distribution is trimodal, with a coarse mode more than 12 μm that contributes up to 30% of the total mass. A temporal series for these data leads to identification of the most relevant size ranges for a specific furnace (e.g., the most penetrating size range). In this cupola, this size range is between 0.32 and 0.77 μm of aerodynamic equivalent diameter and defines the pollution control strategy for metals concentrating within this size range. Scrap quality effect is best monitored at less than 0.2 nm in aerodynamic equivalent diameter and has been confirmed as strongly dependent on the physical state of the charge.
机译：铸铁冲天炉的气溶胶尺寸分布取决于半连续过程动力学，沿攻丝循环的时间，稀释比以及装料和燃料的物理和化学性质。所有这些因素都会导致空气动力学直径（PM_（2.5））等于或小于2.5μm的颗粒物（PM）的高度时间依赖性排放，甚至是基于质量浓度的排放。经常基于低可靠性参数（例如排放因子）和空气动力学直径（PM_（10））的PM_（2.5）与PM 10μm或更小建立的松散质量比来采取控制措施。新的环境要求可能会在过程改进措施的含义和有效性上带来意想不到和不希望有的缺点和不确定性。为减少颗粒排放而开发过程集成和烟道气清洁措施需要对熔化过程中的生成机理有更深入的了解。可用的气溶胶分析仪扩大了要解决的控制问题的范围，并有助于大大减少有关痕量污染物控制的工程决策的不确定性。这种方法结合了实时尺寸分布监控和级联撞击器作为化学或形态分析的分隔器。结果允许建立控制设备的设计原理和性能要求。选择空气动力学当量直径小于10μm的数值分布作为电荷影响和过滤器性能的主要指标。尺寸分布是三峰的，粗糙模式大于12μm，占总质量的30％。这些数据的时间序列导致确定特定炉子的最相关尺寸范围（例如，最穿透的尺寸范围）。在此冲天炉中，此尺寸范围在空气动力学等效直径的0.32到0.77μm之间，并定义了在此尺寸范围内浓缩金属的污染控制策略。最好在小于0.2 nm的空气动力学当量直径下监测废料质量效应，并且已确认其强烈依赖于装药的物理状态。

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