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This study investigates the chemical composition and brown carbon (BrC) light-absorption characteristics of smoke particles from six industrial biomass boilers. The mass fractions of organic carbon (OC) and elemental carbon (EC) in the smoke particles were 1.96% and 0.78%, respectively, while water-soluble inorganic ions accounted for 46.3% of the mass. Significant differences in the chemical composition of smoke particles were observed across different boilers, influenced by factors such as fuel types, boiler loads, and dust removal techniques. Soot-EC from bag-filtered boilers exhibited a higher OC/EC ratio (10.8) compared to cyclone-filtered boilers (2.27). The carbon components were predominantly OC2, OC3, OC4 and EC1, with a highly variable Char-EC/Soot-EC ratio (average: 18.7, range: 0.25~86.0). Water-soluble inorganic ions were primarily K+, Cl-, Na+, SO42- and Ca2+, constituting 81.0%~93.6% of the total ions. The spectral properties of BrC, including water-soluble organic carbon (WSOC) and methanol-soluble organic carbon (MSOC), showed limited correlation with boiler fuel, load, or dust removal method. The mass absorption efficiency at 365 nm (MAE365) was closely related to the OC/EC ratio, suggesting a strong link between BrC photo-absorption capacity and combustion conditions. The mass absorption efficiency of WSOC (MAEWSOC) from industrial biomass boiler was 4~5 times higher than that from biomass cookstoves and 5~9 times higher than open biomass combustion emissions, as reported in literature. The study elucidates the light absorption characteristics of brown carbon in smoke particles emitted from industrial biomass boiler and their correlation with combustion conditions.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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