Chemical Industry and Engineering Progress ›› 2019, Vol. 38 ›› Issue (04): 2022-2029.DOI: 10.16085/j.issn.1000-6613.2018-1236

• Resources and environmental engineering • Previous Articles     Next Articles

Characteristic analysis of fine particles in semi-dry desulfurization of sintering flue gas

Haiying LI1(),Chunqi ZHANG1(),Yuqing ZHANG2,Dong LIU1,Jin WANG1   

  1. 1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China
    2. School of Mechanical Engineering, Tianjin University, Tianjin 300350, China
  • Received:2018-06-13 Revised:2018-07-03 Online:2019-04-05 Published:2019-04-05
  • Contact: Chunqi ZHANG

烧结烟气半干法脱硫微细颗粒物特征分析

李海英1(),张春奇1(),张宇擎2,刘东1,王锦1   

  1. 1. 华北理工大学冶金与能源学院,河北 唐山 063210
    2. 天津大学机械工程学院,天津 300350
  • 通讯作者: 张春奇
  • 作者简介:<named-content content-type="corresp-name">李海英</named-content>(1971—),女,教授,硕士生导师,研究方向为工业节能与环境保护。E-mail:<email>hblglhy@sina.com</email>。|张春奇,硕士研究生,研究方向为工业节能与环境保护。E-mail:<email>zcqhblg@163.com</email>。
  • 基金资助:
    河北省科技计划(14213809D)

Abstract:

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 (SEM-EDS). 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 Fe2O3, 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,CaSO3,and CaSO4,and also contain a certain amount of quartz,magnesia,and some amorphous glass phases.

Key words: sintering flue gas, fine particles, particle size distribution, particle morphology, chemical composition

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Fe2O3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、CaSO3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。

关键词: 烧结烟气, 微细颗粒物, 粒径分布, 颗粒形貌, 化学组分

CLC Number: 

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