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

doi:10.16085/j.issn.1000-6613.2018-1236

Abstract

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:

X701

Haiying LI, Chunqi ZHANG, Yuqing ZHANG, Dong LIU, Jin WANG. Characteristic analysis of fine particles in semi-dry desulfurization of sintering flue gas[J]. Chemical Industry and Engineering Progress, 2019, 38(04): 2022-2029.

李海英, 张春奇, 张宇擎, 刘东, 王锦. 烧结烟气半干法脱硫微细颗粒物特征分析[J]. 化工进展, 2019, 38(04): 2022-2029.

Figures/Tables 15

理论成分	质量分数/%	理论成分	质量分数/%
Fe (tot)	56.02	MnO	0.21
SiO₂	5.57	S	0.05
Al₂O₃	2.55	P₂O₅	0.14
CaO	10.01	Cu	0.02
MgO	1.32	Na₂O	0.04
TiO₂	0.63	K₂O	0.17

元素	质量分数/%
元素	区域1	区域2
Zn	—	0.91
Fe	1.58	51.36
Ca	—	—
K	38.34	13.78
Cl	29.56	13.67
S	2.85	1.87
Si	1.9	2.16
Al	2.5	2.8
Mg	—	—
Na	4.68	6.26
O	18.59	7.19

元素	质量分数/%
元素	区域3	区域4
Zn	—	—
Fe	—	—
Ca	37.82	41.1
K	0.41	-
Cl	0.99	1.28
S	5.33	2.49
Si	—	—
Al	—	—
Mg	2.56	3.28
Na	—	—
O	54.56	51.85

矿相	化学式	参比强度	积分强度 /cps	质量分数 /%
钾盐（sylvite）	KCl	6.07	59540	78.64
赤铁矿（hematite）	Fe₂O₃	3.04	2051	5.41
磁铁矿（magnetite）	Fe₃O₄	4.90	1757	2.88
石盐（halite）	NaCl	2.53	2952	9.36
氯化钙（calcium chloride）	CaCl₂	4.6	1266	1.50
石英（quartz）	SiO₂	2.11	394	2.21

矿相	化学式	参比强度	积分强度 /cps	质量分数/%
氢氧钙石（portlandite）	Ca(OH)₂	1.4	16197	37.36
亚硫酸钙（calcium sulfite hydrate）	CaSO₃·nH₂O	0.68	7067	33.56
方解石（calcite）	CaCO₃	3.25	9065	9.01
方镁石（periclase）	MgO	3.03	2878	3.07
石膏（gypsum）	CaSO₄·2H₂O	1.83	1281	2.26
硬石膏（anhydrite）	CaSO₄	2.3	1287	1.81
半水硫酸钙（calcium sulfate hydrate）	CaSO₄·0.5H₂O	1.04	1287	4.20
石灰（lime）	CaO	2.54	325	0.41
硅酸三钙（calcium silicate oxide）	Ca₃SiO₅	0.85	2190	8.32

I_X	——	X相的最强峰衍射强度
I_i	——	任一相的最强峰衍射强度
$K A l 2 O 3 X$	——	X相的K值可从PDF卡片中查到

I_X	——	X相的最强峰衍射强度
I_i	——	任一相的最强峰衍射强度
$K A l 2 O 3 X$	——	X相的K值可从PDF卡片中查到

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