Abstract To reduce the emission of fine particulate matter (PM) in coal-fired power plants, a new method aimed to improve the removal of fine particulate matter based on heterogeneous vapor condensation was investigated. The ideal supersaturation environment, necessary to the occurrence of heterogeneous vapor condensation, was achieved by reducing the initial temperature of limestone-gypsum desulfurization flue gas with a fluorine plastic heat exchanger. The temperature drop, initial relative humidity and initial temperature of desulfurized flue gas have an important influence on the establishment of ideal supersaturation environment and the reduction efficiency of fine particulate matter. Numerical calculation indicates that a higher temperature drop and initial relative humidity of the desulfurized flue gas is beneficial to the establishment of ideal supersaturation environment, while the influence of initial temperature of desulfurized flue gas is unobvious. It has been also experimentally proved that the increase of temperature drop and initial relative humidity have a positive effect to the improvement of the reduction efficiency. However, it can be also found that the reduction efficiency changes slightly with the variation of the initial temperature of desulfurized flue gas. Therefore, this method is suitable for different initial temperatures of desulfurized flue gas and is more applicable for practical industrial applications. Most commonly, the optimal value of temperature drop of desulfurized flue gas is in the range of 4 to 6 °C and the corresponding number concentration of fine particulate matter emission can be reduced as high as about 43%.

中文翻译：

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基于脱硫烟气非均相冷凝提高细颗粒物去除效果

摘要 为减少燃煤电厂细颗粒物（PM）的排放，研究了一种基于非均相蒸汽冷凝的细颗粒物去除新方法。通过使用氟塑料换热器降低石灰石-石膏脱硫烟气的初始温度，实现了发生非均相蒸汽冷凝所必需的理想过饱和环境。脱硫烟气的温降、初始相对湿度和初始温度对理想过饱和环境的建立和细颗粒物的还原效率有重要影响。数值计算表明，脱硫烟气较高的温降和初始相对湿度有利于理想过饱和环境的建立，而脱硫烟气初始温度的影响不明显。实验也证明，温降和初始相对湿度的增加对还原效率的提高有积极的影响。但也可以发现，随着脱硫烟气初始温度的变化，还原效率略有变化。因此，该方法适用于不同的脱硫烟气初始温度，更适用于实际工业应用。最常见的，