Critical Fluidization Characteristics of Iron Ore in Fluidized Bed Reactor

doi:10.12068/j.issn.1005-3026.2024.04.017

Abstract

Abstract:

The U‐type reaction chamber is a core component of suspension roasting equipment， the critical fluidization characteristics of materials have both theoretical and practical significance. Therefore， this paper built a cold test system， and conducted research using hematite powder and aluminum oxide powder as materials to study the influence of aeration air volume， material properties on the critical fluidization characteristics， and modified empirical formula of critical fluidization characteristics based on the test. The results show that the critical fluidization gas velocity increases with the increase in particle size and density of materials. The critical fluidization velocity decreases with the increase of the aeration air volume under the condition of a fixed bed in the loosening chamber， the modified formula fits well with the experimental results and can be used to predict fluidization behavior. The research results are helpful to realize the integration of suspension roasting technology and equipment， and also have certain guiding significance for industrial applications.

Key words: suspension magnetizing roaster, fluidized bed reactor, cold test, deceleration method, critical fluidization characteristic

CLC Number:

TD 925.7

Zhi-ming LI, Yue-xin HAN, Yong-sheng SUN, Zhi-dong TANG. Critical Fluidization Characteristics of Iron Ore in Fluidized Bed Reactor[J]. Journal of Northeastern University(Natural Science), 2024, 45(4): 592-599.

Figures/Tables 12

References 20

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固体物料	粒级/mm	体积平均粒度/mm	真密度/（kg·m^-3）	表观骨架密度/（kg·m^-3）	堆积密度/（kg·m^-3）
氧化铝粉	<0.074	0.071	2 398.89	2 135.68	1 200.18
	0.074~0.10	0.092	2 398.89	2 135.68	1 205.98
	0.10~0.15	0.147	2 398.89	2 135.68	1 242.49
赤铁矿粉	<0.074	0.070	3 645.32	3 542.27	2 197.08
	0.074~0.10	0.093	3 645.32	3 542.27	2 214.56
	0.10~0.15	0.146	3 645.32	3 542.27	2 227.70
	0.15~0.30	0.215	3 645.32	3 542.27	2 241.63

固体物料	粒级/mm	体积平均粒度/mm	真密度/（kg·m^-3）	表观骨架密度/（kg·m^-3）	堆积密度/（kg·m^-3）
氧化铝粉	<0.074	0.071	2 398.89	2 135.68	1 200.18
	0.074~0.10	0.092	2 398.89	2 135.68	1 205.98
	0.10~0.15	0.147	2 398.89	2 135.68	1 242.49
赤铁矿粉	<0.074	0.070	3 645.32	3 542.27	2 197.08
	0.074~0.10	0.093	3 645.32	3 542.27	2 214.56
	0.10~0.15	0.146	3 645.32	3 542.27	2 227.70
	0.15~0.30	0.215	3 645.32	3 542.27	2 241.63

床料	粒级/mm	松动风量/（m³·h^-1）	v_mf/（m·s^-1）
赤铁矿粉	0.074~0.10	0.0	0.80
		0.1	0.75
		0.2	0.68
		0.3	0.64
		0.4	0.60
	0.15~0.30	0.0	1.60
		0.1	1.58
		0.2	1.52
		0.4	1.50
		0.6	1.48

床料	粒级/mm	松动风量/（m³·h^-1）	v_mf/（m·s^-1）
赤铁矿粉	0.074~0.10	0.0	0.80
		0.1	0.75
		0.2	0.68
		0.3	0.64
		0.4	0.60
	0.15~0.30	0.0	1.60
		0.1	1.58
		0.2	1.52
		0.4	1.50
		0.6	1.48

固体物料	粒级	平均粒度		v_mf/（m·s^-1）
固体物料	mm	mm		计算值	试验值
氧化铝粉	<0.074	0.071	0.11		0.40
	0.074~0.10	0.092	0.23		0.45
	0.10~0.15	0.147	0.48		0.53
赤铁矿粉	<0.074	0.070	0.15		0.55
	0.074~0.10	0.093	0.29		0.78
	0.10~0.15	0.146	0.65		1.08
	0.15~0.30	0.215	1.31		1.40