Emissions of air pollutants from household stoves: honeycomb coal versus coal cake.
Domestic coal combustion can emit various air pollutants. In the present study, we measured emissions of particulate matter (PM) and gaseous pollutants from burning a specially formulated honeycomb coal (H-coal) and a coal cake (C-coal). Flue gas samples for PM2.5, PM coarse (PM2.5-10), and TSP were collected isokinetically using a cascade impactor; PM mass concentrations were determined gravimetrically. Concentrations of SO2, NOx, and ionic Cr(VI) in PM were analyzed using spectrometric methods. Fluoride concentrations were measured using a specific ion electrode method. PM elemental components were analyzed using an X-ray fluorescence technique. Total (gas and particle phase) benzo[a]pyrene (BaP) concentration was determined using an HPLC/fluorescence method. Elemental and organic carbon contents of PM were analyzed using a thermal/optical reflectance technique. The compositional and structural differences between the H-coal and C-coal resulted in different emission characteristics. In generating 1 MJ of delivered energy, the H-coal resulted in a significant reduction in emissions of SO2 (by 68%), NOx (by 47%), and TSP (by 56%) as compared to the C-coal, whereas the emissions of PM2.5 and total BaP from the H-coal combustion were 2-3-fold higher, indicating that improvements are needed to further reduce emissions of these pollutants in developing future honeycomb coals. Although the H-coal and the C-coal had similar emission factors for gas-phase fluoride, the H-coal had a particle-phase fluoride emission factor that was only half that of the C-coal. The H-coal had lower energy-based emissions of all the measured toxic elements in TSP but higher emissions of Cd and Ni in PM2.5.
Am-As Corporation, Portland, Oregon, USA.
Su
S
Ge
Xu
X
Xu
Judith C
JC
Chow
John
J
Watson
Qing
Q
Sheng
Weili
W
Liu
Zhipeng
Z
Bai
Tan
T
Zhu
Junfeng
J
Zhang
D000393:Air Pollutants / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis*; D001564:Benzo(a)pyrene / Q000032:analysis; D017608:Chromium Compounds / Q000032:analysis; D003031:Coal / Q000032:analysis; D005459:Fluorides / Q000032:analysis; D006794:Household Articles; D009589:Nitrogen Oxides / Q000032:analysis; D010316:Particle Size; D013458:Sulfur Dioxide / Q000032:analysis
D000393:Air Pollutants; D017608:Chromium Compounds; D003031:Coal; D009589:Nitrogen Oxides; D013458:Sulfur Dioxide; D001564:Benzo(a)pyrene; D005459:Fluorides