烧结烟气半干法脱硫微细颗粒物特征分析
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摘要
通过激光粒度分析仪(LPSA)对烧结烟气微细颗粒物进行粒度分析,获得烧结过程烟气排放的主要微细颗粒物粒径范围及分布特性。运用扫描电镜-能谱分析仪(SEM-EDS)、X射线衍射仪(XRD)对半干法脱硫前后烧结烟气中的微细颗粒物形貌、元素组成和物相成分进行分析对比。结果发现:脱硫前后的烧结粉尘颗粒特性存在较大差异。在粒径分布上,脱硫前后粒径范围分别为0.816～60.988μm和0.259～407.850μm,脱硫后中位粒径向小粒径偏移;在颗粒形貌上,大烟道中以不光滑球形和不规则颗粒为主,脱硫后以板块状和片状颗粒为主。在元素和物相组成上,大烟道中颗粒中主要元素为Fe、K、Cl,Fe元素以Fe_2O_3为主,K元素主要以KCl存在,并能观察到明显的立方体KCl颗粒;脱硫后,受脱硫剂影响,颗粒物中主要元素为Ca、O、S,主要以Ca(OH)2、CaSO_3和CaSO4为主,同时还含有一定量的石英、氧化镁及一些不定形玻璃相。
Fine particles of sintering flue gas were analyzed by a laser particle size analyzer(LPSA). The particle size range and distribution characteristics of the main fine particles discharged from the sintering process were obtained. The morphology,elemental composition and phase composition of fine particles in the sintering flue gas before and after semi-dry desulfurization were analyzed and compared using X-ray diffractometer(XRD) and scanning electron microscopy equipped with energy dispersion spectrum(SEMEDS). The results showed that there are large differences in the characteristics of the sintering dust particles before and after desulfurization. In terms of particle size distribution,the particle size range before and after desulfurization was 0.816μm to 60.988μm and 0.259μm to 407.850μm,respectively.After desulfurization,the particle size shifted to a small particle size. In the particle morphology,the main flue is mainly composed of irregular spherical particles and irregular particles. After desulphurization,plate-like and flake-like particles are the main components. On the composition of elements and phases,the main elements in the large flue are Fe, K, Cl. Fe is mainly Fe_2 O_3, K is mainly in KCl, and obvious cubic KCl particles can be observed. After desulfurization,the main elements in the particulates are Ca, O,and S, mainly Ca(OH)2,CaSO_3,and CaSO4,and also contain a certain amount of quartz,magnesia,and some amorphous glass phases.
Fine particles of sintering flue gas were analyzed by a laser particle size analyzer(LPSA). The particle size range and distribution characteristics of the main fine particles discharged from the sintering process were obtained. The morphology,elemental composition and phase composition of fine particles in the sintering flue gas before and after semi-dry desulfurization were analyzed and compared using X-ray diffractometer(XRD) and scanning electron microscopy equipped with energy dispersion spectrum(SEMEDS). The results showed that there are large differences in the characteristics of the sintering dust particles before and after desulfurization. In terms of particle size distribution,the particle size range before and after desulfurization was 0.816μm to 60.988μm and 0.259μm to 407.850μm,respectively.After desulfurization,the particle size shifted to a small particle size. In the particle morphology,the main flue is mainly composed of irregular spherical particles and irregular particles. After desulphurization,plate-like and flake-like particles are the main components. On the composition of elements and phases,the main elements in the large flue are Fe, K, Cl. Fe is mainly Fe_2 O_3, K is mainly in KCl, and obvious cubic KCl particles can be observed. After desulfurization,the main elements in the particulates are Ca, O,and S, mainly Ca(OH)2,CaSO_3,and CaSO4,and also contain a certain amount of quartz,magnesia,and some amorphous glass phases.
引文
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[14] ZHAN G, GUO Z. Basic properties of sintering dust from iron and steel plant and potassium recovery[J]. Journal of Environmental Sciences,2013, 25(6):1226-1234.
[15] ZHAN G, GUO Z. Water leaching kinetics and recovery of potassium salt from sintering dust[J]. Transactions of Nonferrous Metals Society of China, 2013, 23(12):3770-3779.
[2] GóMEZ S Y, HOTZA D. Predicting powder densification during sintering[J]. Journal of the European Ceramic Society, 2018, 38(4):1736-1741.
[3]范晓慧,甘敏,季志云,等.烧结烟气超细颗粒物排放规律及其物化特性[J].烧结球团, 2016(3):42-45.FAN Xiaohui,GAN Min,JI Zhiyun,et al. The rules of super fine particulate emission from sintering flue gas and its physicochemical properties[J]. Sintering and Pelletizing,2016(3):42-45.
[4]李小玲,孙文强,赵亮,等.典型钢铁企业物能消耗与烟粉尘排放分析[J].东北大学学报(自然科学版), 2016(3):352-356.LI Xiaoling,SUN Wenqiang,ZHAO Liang,et al.Energy consumption and smoke and dust emissions analysis of typical iron and steel production enterprise[J]. Journal of Northeastern University(Natural Science), 2016(3):352-356.
[5]佘雪峰,薛庆国,董杰吉,等.钢铁厂典型粉尘的基本物性与利用途径分析[J].过程工程学报, 2009(s1):7-12.SHE Xuefeng,XUE Qingguo,DONG Jieji,et al. Study on basic properties of typical industrial dust from iron and steel plant and analysis of its utilization[J]. The Chinese Journal of Process Engineering, 2009(s1):7-12.
[6]付本全,黄建阳,吴英,等.烧结机头除尘灰理化性能及磁性特征分析[J].武汉科技大学学报, 2014(4):254-257.FU Benquan,HUANG Jianyang,WU Ying,et al. Physicochemical properties and magnetic characteristics of electrical precipitator dust on the head of sintering machine[J]. Journal of Wuhan Universitiy of Science and Technology, 2014(4):254-257.
[7] GAN M, JI Z, FAN X, et al. Emission behavior and physicochemical properties of aerosol particulate matter(PM10/2.5)from iron ore sintering process[J]. ISIJ International. 2015, 55(12).
[8]赵亚丽,赵浩宁,范真真,等.烧结机细颗粒物PM2.5排放特性[J].环境工程学报, 2015(3):1369-1375.ZHAO Yali,ZHAO Haoning,FAN Zhenzhen,et al. Emission characteristics of PM2.5from sintering machine[J]. Chinese Journal of Environmental Engineering, 2015(3):1369-1375.
[9]马京华.钢铁企业典型生产工艺颗粒物排放特征研究[D].重庆:西南大学, 2009.MA Jinghua. Emission characteristics of particulates from typical production process of iron and steel enterprises[D]. Chongqing:Southwest University, 2009.
[10] WU Xiaoqin,TONG Shitang,GUAN Baohong,et al. Transformation of flue-gas-desulfurization gypsum toα-hemihydrated gypsum in salt solution at atmospheric pressure[J]. Chinese Journal of Chemical Engineering, 2011(2):349-355.
[11] KORALEGEDARA N H, AL-ABED S R, RODRIGO S K, et al.Alterations of lead speciation by sulfate from addition of flue gas desulfurization gypsum(FGDG)in two contaminated soils[J]. Science of the Total Environment, 2017, 575:1522-1529.
[12]吉忠海,陈津,郭宇,等.微波加热分解脱硫石膏生产烧结矿研究[J].化工进展, 2016, 35(7):2251-2257.JI Zhonghai,CHEN Jin,GUO Yu,et al. Decomposition of flue gas desulfurization(FGD)gypsum under microwave heating to produce sinter ore[J]. Chemical Industry and Engineering Progress, 2016, 35(7):2251-2257.
[13]钱峰,于淑娟,侯洪宇,等.烧结机头电除尘灰资源化再利用[J].钢铁, 2015(12):67-71.QIAN Feng,YU Shujuan,HOU Hongyu,et al. Recycling of the electric dust in sintering machine head[J]. Iron and Steel, 2015(12):67-71.
[14] ZHAN G, GUO Z. Basic properties of sintering dust from iron and steel plant and potassium recovery[J]. Journal of Environmental Sciences,2013, 25(6):1226-1234.
[15] ZHAN G, GUO Z. Water leaching kinetics and recovery of potassium salt from sintering dust[J]. Transactions of Nonferrous Metals Society of China, 2013, 23(12):3770-3779.