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利用静电低压撞击器(ELPI)对石灰石-石膏法脱硫前后烟气中的细颗粒(PM2.5)进行采样分析,获得细颗粒浓度与粒径分布特性。对脱硫前后细颗粒形貌和主要元素进行扫描电镜(SEM)、离子色谱(IC)和电感耦合等离子体发射光谱仪(ICP-OES)进行分析。结果表明,石灰石-石膏法对于烟气中的细颗粒数浓度的脱除效率为负值,脱硫后出口烟气细颗粒数浓度增加4.95倍;细颗粒的形貌发生很大变化,脱硫前细颗粒以单个球形或团形态分布,脱硫后颗粒相互堆积形成致密不规则层状结构;化学组成分析表明,细颗粒中主量元素Al、Fe和Si的含量稳定,但水溶性离子Ca2+和SO2-4含量增加明显,分别由3.5%、6.45%增加到8.76%、32.73%。
Electrostatic low pressure impactor (ELPI) was used to sample and analyze the fine particles (PM2.5) in the flue gas before and after limestone-gypsum desulfurization, and the fine particle concentration and particle size distribution characteristics were obtained. The morphology of fine particles and the main elements before and after desulfurization were analyzed by scanning electron microscopy (SEM), ion chromatography (IC) and inductively coupled plasma atomic emission spectrometry (ICP-OES). The results show that limestone-gypsum method has a negative value for the removal efficiency of fines in flue gas, the flue gas concentration in flue gas after desulfurization increases 4.95 times, and the morphology of fines is greatly changed. The particles are distributed in a single sphere or in the form of clusters. After desulfurization, the particles accumulate with each other to form a dense and irregular layered structure. The chemical composition analysis shows that the content of main elements Al, Fe and Si in the fine particles is stable, but the content of water-soluble ions Ca2 + and SO2- 4 content increased significantly from 3.5%, 6.45% to 8.76%, 32.73%.