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In response to current issues faced by coal-fired power plants, such as high fuel costs, weakly stable combustion performance at low loads, and insufficient peak-shaving capabilities, an integrated operational scheme is proposed based on the natural endowments of renewable energy surrounding the power plant, which utilizes photovoltaic power generation distributed in plants to produce hydrogen and oxygen via electrolysis of water, then to achieve hydrogen and oxygen co-firing in coal-fired boilers. By constructing a full-size numerical model for a tangentially coal-fired boiler, the calculation accuracy of temperature field, species concentration, and carbon content in fly ash is verified under pure pulverized coal combustion conditions, which could provide a benchmark for optimization of hydrogen and oxygen blending. Based on the typical application scenario of a 20 MW photovoltaic power generation to hydrogen and oxygen production in the plant, the effects of three mixing methods of hydrogen and oxygen on combustion efficiency, burnout characteristics and NOx formation in the furnace are systematically studied. The results show that, a co-combustion mode which utilizes an independent hydrogen nozzle in conjunction with primary air mixing with oxygen can improve the combustion performance significantly. The carbon content in fly ash at the furnace outlet reduces to 0.97%, and the combustion efficiency is notably enhanced compared with that under pure coal combustion condition. At the same time, the reduction effect of reactive species generated by hydrogen combustion on NOx leads to a decrease in NOx emission mass concentration in the flue gas to 294.0 mg/m3, which is decreased by about 25% compared with that under baseline condition of pure coal combustion. This model achieves dual-benefit of coal substitution and combustion optimization through hydrogen and oxygen production from renewable energy, which not only reduces coal consumption but also expands the lower limit of stable combustion load for coal-fired boilers. It provides a technically feasible implementation reference path for the decarbonized retrofitting and flexibility improvement of coal-fired units.
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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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