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To address the issues of reduced combustion efficiency and increased pollution caused by the easy deposition of pulverized coal particles from lower burners of coal-fired boilers in cold ash hoppers, a CFD numerical simulation method is used to comparatively analyze the boiler combustion characteristics under the working conditions before the supplementary lifting air is applied, when the swirl burners near the side walls are deflected by 5° toward the center of the furnace, and after the supplementary lifting air is applied. The results show that after the supplementary lifting air is applied, the lifting effect on the lower pulverized coal airflow is enhanced, the deposition amount of unburned carbon particles is reduced by 30.5%, and the burnout rate is increased to 99.44%. The deflection of the burners makes the flame narrow and elongated, reduces the temperature of the side walls, but increases the CO concentration in the cold ash hopper. The supplementary lifting air reduces the CO concentration by enhancing the O₂ supply at the bottom. After the lifting air is supplemented, the air staging is significantly intensified, the reducing atmosphere in the main combustion zone is enhanced, and the NO mass concentration (standard condition) at the furnace outlet is reduced from 315.3 mg/m³ to 282.1 mg/m³. The retrofit of theburner deflection and lifting air at the bottom of the boiler can effectively regulate the pulverized coal transport path, inhibit particle sedimentation, and reduce pollutant emissions. The research results can provide a theoretical basis and engineering practice guidance for related boiler transformations.
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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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