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- W3110490748 abstract "To explore the effect of water vapor (H 2 O(g)) on the formation characteristics of ultrafine particulate matter (PMs), Huangling coal char reacted in a high-temperature drop tube furnace (DTF) at 1800 K under various O 2 /N 2 /H 2 O atmospheres, with the content of H 2 O(g) varied at 0, 5%, 10%, 20% and 30% respectively. The results showed that both the number-based and mass-based particle size distributions (PSDs), the bimodal distribution of ultrafine PMs remained almost unchanged with increasing H 2 O(g) content, while the peak of ultrafine PMs shifted and the magnitude of the main peak fluctuated. H 2 O(g) elevated the mass fraction of ultrafine PMs with a larger particle size (D 50 = 0.2134 μm) and the number fraction of ultrafine PMs with a smaller particle size (D 50 = 0.0093 μm and D 50 = 0.0167 μm) significantly. With the increase of H 2 O(g) content, both the number and mass of ultrafine PMs decreased first and then increased with the inflection point at 5% H 2 O(g) content, indicating that lower H 2 O(g) content inhibited the formation of ultrafine PMs while higher H 2 O(g) content promoted its formation. Meanwhile, with the increase of H 2 O(g) content, the average mass of single ultrafine particle, being higher in wet combustion atmospheres than that in dry combustion atmosphere, increased first and then decreased with the inflection point at the content of 5%. In addition, when the H 2 O(g) content was 5%, the average particle size of ultrafine particle was the largest, which increased by 9.07% compared with that under dry combustion atmosphere. Finally, the influence mechanism of H 2 O(g) on the formation of ultrafine PMs during char combustion was clarified. • Low H 2 O(g) content inhibited ultrafine PMs formation, while higher H 2 O(g) promoted it. • H 2 O(g) improved the growth of ultrafine particle in comparison with dry atmosphere. • The mass of single ultrafine particle increased then decreased with elevated H 2 O(g). • Competition between combustion temp and reduction atm affected ultrafine PM formation." @default.
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- W3110490748 date "2021-02-01" @default.
- W3110490748 modified "2023-09-26" @default.
- W3110490748 title "The role of H2O(g) in the formation of ultrafine PMs under O2/N2/H2O atmosphere" @default.
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- W3110490748 doi "https://doi.org/10.1016/j.joei.2020.11.010" @default.
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