Attapulgite suspension mitigates fine particulate matter (PM2.5) emission from coal combustion in fluidized bed. (1st March 2018)

• Record Type: Journal Article
• Authors: Chen, Huichao; Tang, Xiaobin; Liang, Cai; Wu, Xin
• Is Part Of: Journal of environmental management. Volume 209(2018)
• Page Start: 245
• Page End: 253
• Publication Date: 2018-03-01
• Subjects: PM2.5 -- Attapulgite suspension -- Fluidized bed -- Coal combustion; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2017.12.072
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: To reduce fine particulate matter emission from coal burning sources especially fossil fuel fired energy generation facility is critical to improve air quality. Attapulgite suspension was attempted to spray in a 6 kW fluidized bed facility and reduce fine particulate matter emission during coal combustion. The key parameters such as attapulgite mass, flowrate and spraying zone were investigated to determine the optimal and critical conditions that influence fine particulate matter emission. Exciting results indicate that both fine particle number and mass concentrations are largely decreased due to the physical/chemical absorption with the suitable mass ratio of 3 wt%. The spray of attapulgite suspension in both dense bed and dilute bed effectively mitigates fine particle emission based on the agglomeration and absorption. The most excellent result is achieved at a flowrate of 38 ml/min in dense bed with particle number reduction up to 93.5% in PM2.5 (fine particles is equal to/less than 2.5 μm), 93.6% in PM1.0 (fine particles is equal to/less than 1.0 μm) and 93.7% in PM0.1 (fine particles is equal to/less than 0.1 μm), respectively. The work highlights the potential of spraying attapulgite suspension as an effective process to reduce fine particle emission during coal combustion in fluidized bed system. Graphical abstract: Spraying attapulgite suspension in bed effectively reduces fine particle emission during coal combustion. 93.5% reduction in PM2.5, 93.6% in PM1 and 93.7% in PM0.1 is achieved with 38 ml/min attapulgite suspension spraying in dense bed.Image 1 Highlights: Attapulgite mitigates fine particle emission during coal combustion. Attapulgite suspension reduces fine particle emission during coal combustion. 93.5% reduction in PM2.5 is achieved with attapulgite suspension spraying in dense bed. SO2 and NOx removal is achieved with attapulgite suspension spraying in bed.