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Co-combustion of biomass and coal can significantly reduce the pollutants and carbon emissions. However, the pollutants emission, ash characteristics and their influence factors during co-combustion of coal and biomass are still obscure. A micro-fluidized bed reactor was used to investigate the co-combustion of rice husk (RH) and bituminous coal (SC). The effects of combustion temperature, atmosphere and blending ratio on the emission characteristics of NO, SO2 and ash were studied. The results indicated that, with the increase of temperature, the mass concentration of NO emissions during co-combustion rose at first and then fell, while the SO2 emissions mass concentration gradually increased. High temperature would promote the interaction of minerals in the ash, generating Na2Al2SiO6 and lowering the melting point of the co-combustion ash. In oxygen-deficient atmosphere, NO and SO2 emission mass concentrations increased with the O2 volume fraction. In oxygen-enriched atmosphere, the NO emission mass concentration gradually decreased as the O2 volume fraction increased, while the SO2 emission mass concentration increased at first and then decreased. The influence of reaction atmosphere on the main composition and crystal structure of the co-combustion ash was relatively minor. NO and SO2 emissions during co-combustion can be effectively reduced due to the addition of RH. As the RH blending ratio was increased, Ca3Al2O6 in ash tended to form low-melting-point compounds with SiO2, leading to a noticeable melting phenomenon.
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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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