Function mechanism of porous bed absorbing hazardous ultra-fined particles during iron ore sintering process

ABSTRACT

This study revealed the relationship between the emission profile of PM₁₀ & PM_2.5 and absorption property of porous sintering bed, and elucidated the potential mechanism. Results show that both PM₁₀ and PM_2.5 characterized regionally high emission property, and tended to be higher from stage-4 to stage-6 for PM₁₀ and from stage-4 to stage-5 for PM_2.5. Increasing the wet mixture layer thickness and moisture content improved the absorption efficiency to PM₁₀ and PM_2.5. Potential absorption mechanism can be mainly attributed to the inertial effect and condensed water vapour agglomeration effect in porous sintering bed. Stage-1 to stage-3 corresponded to thicker wet porous particle layer, and stronger agglomeration effect of condensed water vapour, which made the sintering bed of stronger absorption capacity. Since wet mixture disappeared during stage-4 to stage-6, the absorption efficiency of sintering bed to PM₁₀ and PM_2.5 was weak, leading to their regional high emission concentration property.

KEYWORDS:

• Iron ore sintering
• PM₁₀
• PM_2.5
• absorption mechanism
• emission control

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was financially supported by the National Natural Science Foundation of China (grant nos. 51804347 and U1660206), and the Foundation supported by Central South University for Young Teachers.