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Coal-fired power generation coupled with biomass is one of the efficient carbon-reduction technologies for coal-fired units. As a typical energy plant, arundo donax has the characteristics of high yield, strong environmental adaptability and high calorific value, and can be used for large-scale coal-fired power generation. To investigate the effect of co-firing arundo donax in a pulverized-coal boiler on NOx emissions and explore the migration pathways of fuel nitrogen during the co-combustion of coal and arundo donax, a co-combustion reaction model of arundo donax and coal was established with a two-stage plug flow reactor (PFR). The formation characteristics and reaction mechanisms of nitrogen oxides during co-combustion of the arundo donax and coal in a pulverized-coal boiler were studied, focusing on exploring the influences of co-firing ratio, over-fire air (OFA) ratio, and OFA position on the formation characteristics of nitrogen oxides. The results show that the NOx emission can be reduced by co-firing arundo donax, and the mass concentration of NOx decreases with the increase in co-firing ratio of arundo donax. The NOx conversion rate and NOx mass concentration first decrease and then increase with the increase in over-fire air ratio, and there is an optimal over-fire air ratio (around 33%) to minimize NOx emissions. Delaying the position of the OFA leads to a decrease in both the NOx conversion rate and NOx mass concentration. By studying the NOx formation characteristics and the nitrogen migration pathways during co-combustion of coal and arundo donax, theoretical guidance can be provided for parameter setting and reducing exhaust NOx emissions in the co-combustion of arundo donax for coal-fired power generation.
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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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