【摘要】 为探讨鄂州电厂设计掺烧40%烟煤的330 MW W型火焰锅炉全烧烟煤的可行性，开展W型火焰锅炉燃用100%烟煤的锅炉热力计算及全炉膛数值模拟研究，采用炉膛出口烟温和炉内组分浓度等指标评判其运行安全性及稳定性，明确W型火焰锅炉燃用100%烟煤适应性。结果表明：W型火焰锅炉全烧烟煤后，炉膛出口烟温相对设计工况将提高约10℃,去除卫燃带面积将降低炉膛出口烟温约20℃,可有效保证炉膛出口烟温不超设计值；取消乏气风，提高一次风率，可有效降低燃烧器烧损、炉膛结焦风险；全烧烟煤后，烟煤中燃料氮含量增加，火焰温度升高，未去除锅炉部分原设计敷设的卫燃带时，炉膛出口NO_x质量浓度由640 mg/m~3增至720 mg/m~3,去除锅炉下炉膛侧墙部分(100 m~2)原敷设的卫燃带可降低火焰中心温度，抑制热力型NO_x生成，出口质量浓度可降至480 mg/m~3。更多还原

【Abstract】 In order to investigate the feasibility of the 330 MW W-type flame boiler in Ezhou Power Plant changing from blending 40% bituminous coal to 100% bituminous coal, thermodynamic calculation and numerical simulation of burning 100% bituminous coal were carried out. The safety and stability of the W-type flame boiler were evaluated based on the furnace outlet flue gas temperature, component concentration and other indicators to determine the adaptability of burning 100% bituminous coal. The results show that in the case of W-type flame boiler burning 100% bituminous coal, the furnace outlet flue gas temperature increase by 10 ℃ compared to the design condition. Removing most part of the refractory belt will reduce the outlet flue gas temperature by about 20 ℃,which effectively ensure that outlet flue gas temperature is lower than the design value. Eliminating the exhaust air and increasing the primary air ratio have great benefit in reducing the risk of burner burnout and furnace coking. The burning of 100% bituminous coal led to the increase of the nitrogen content in the fuel as well as the flame temperature. The NO_x concentration at the furnace outlet increases from 640 mg/m~3 to 720 mg/m~3 under the circumstance of not removing the refractory belt. The removal of 100 m~2 refractory belt on the side wall of the lower furnace can reduce flame temperature, thus inhibiting the generation of thermal NO_x and reducing NO_x outlet concentration to 480 mg/m~3.更多还原