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Ammonia-coal co-firing is one of the important ways to achieve carbon reduction of coal-fired thermal power units, but the research on high proportion ammonia co-firing is rare. In order to further explore the feasibility of high-proportion ammonia co-firing, the mechanism model of ammonia-coal co-firing is established, and the ammonia-coal co-firing and pure ammonia combustion process of 4 MW boiler is simulated by using computational fluid dynamics (CFD) method. The error between CFD calculation results and experimental data is less than 3%. The experimental results show that, when ammonia is co-fired with coal, the flame temperature decreases by about 30 ℃ and the carbon dioxide volume fraction decreases by about 20% for every 20% increase in the co-firing ratio. When the ammonia co-firing ratio is increased from 0 to 40%, the NO volume fraction at the furnace outlet increases by about 77.33%, and the carbon content in fly ash increases from 4.65% to 6.16%; when it is increased from 0 to 60%, the NO volume fraction increases by about 136.44%. When excess air ratio of ammonia-coal co-firing is 1.15, the fuel burnout and nitrogen oxide generation are optimized. The two-stage input of ammonia fuel can reduce the NO volume fraction at the furnace outlet by 31.07% compared with the ungraded input. Compared with the combustion flame of coal combustion and ammonia-coal co-firing, the flame temperature of pure ammonia combustion is lower, the ignition distance is longer and the tangent circle diameter is larger. When pure ammonia is fired, the NO mass concentration at the furnace outlet is 475 mg/m3, and the escaping ammonia concentration is close to 0.
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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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