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Outline
The effect of co-firing hydrogen/ammonia on nitrogen oxides emissions from boilers is investigated. The reaction kinetics file is modified based on coal quality analysis and experimental results. A psr reactor network based on CFD simulation results is constructed according to the fluid dynamics (CFD) simulation results. Combing with the chemical reaction kinetics analysis method, the NOx emissions after burning hydrogen/ ammonia at four positions of primary air, peripheral air, secondary air and post secondary air in five schemes are analyzed. The results show that, for the researched boiler, when the hydrogen co-firing position is located in the secondary air scheme, and the hydrogen mixing ratio is 20%, the NO emission reduces by 32.4%, and the emission concentration of unburned carbon does not change much compared to the pure coal condition. When the ammonia co-firing position is located behind the secondary air, the NO emission mass concentration is slightly higher than that under the pure coal condition, and the emission mass concentration of unburned carbon reduces significantly. The above two schemes are recommended for co-firing hydrogen/ammonia in the coal-fired boiler, with nitrogen oxide emissions as the evaluation index. This method and conclusion provides a theoretical basis for the engineering implementation of hydrogen/ammonia co-firing technology.
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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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