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To unveil the ultra-low load operating characteristics and performance optimization method of large-scale units burning high moisture lignite, the influences of burners operating scheme under 33%BMCR condition on the coal combustion, heat transfer and NOx transformation characteristics of a 660 MW unit utility boiler were investigated, based on an established and validated simulation model of coal-fired boiler. The results show that, well-organized flow and combustion field can still be formed inside the furnace under ultra-low load condition, but the overall boiler performance deteriorates evidently, such as obvious decreases in combustion temperature and heat transfer intensity, and increase in NOx emission at outlet of the furnace. When 4 layers of burners are in-service, continuous lower-middle groups or middle-upper groups of burners should be put into operation, to prevent the significant deteriorations of combustion and heat transfer processes and the significant increase in NOx emissions. The number of in-service burners layers significantly affects the overall boiler performance. When there are only two layers of burners in-service, the intense coal combustion area is too concentrated, which is not conducive to maintaining a high combustion temperature and heat transfer intensity, and NOx emissions at the furnace outlet increase at the same time. These findings reveal the influences of burner operating scheme under ultra-low load condition on the overall performance of a 660 MW lignite boiler, which can provide guidance for deep peak shaving operation adjustment and optimization of coal-fired units in the context of large-scale renewable energy power grid connection in the future.
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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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