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Ammonia cofiring in coal-fired boilers is one of the promising technical routes for decarbonization of existing coal-fired power plants. However, ammonia cofiring may potentially result in drastic increase of NOx emissions due to its high nitrogen content. Effective control of NOx emissions is thus one of the key factors that affect the technical feasibility of ammonia cofiring in coal-fired boilers. The formation of NOx during ammonia-coal cofiring is affected by the ammonia combustion as well as its interaction with the coal combustion process. There are significant differences in volatile content of different coal types which may strongly affect the NOx formation characteristics of ammonia cofiring. For this reason, the NOx formation characteristics of ammonia cofiring with bituminous and lean coals that have distinct volatile contents are investigated by an experimental rig that allows for flexible control of the combustion environment of ammonia. The results show that, the NOx emissions from bituminous and lean coals show different trends with the increase of ammonia cofiring ratio under different ammonia cofiring modes. Because of the significant differences in volatile matter content between bituminous and lean coals and the consequent differences in the amount of O2 consumption, the distributions of O2 concentration in the furnace are substantially different between the two coals. This results in different competition relationships between the NO formation and reduction reactions of ammonia in the furnace, which consequently leads to different NOx formation and emission characteristics between the two coals.
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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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