中国电机工程学报2011，Vol.31Issue(5)：1-6,6.
超超临界锅炉磨煤机组合运行方式优化数值模拟
Optimal Simulation on the Combination Mode of Mills for an Ultra-supercritical utility Boiler
摘要
Abstract
The characteristics of flow, combustion, heat transfer and NOx emission were numerically investigated under the different combination modes of mills for a 1 000 MW ultra-supercritical swirling opposed coal-fired utility boiler.The simulated results agree well with the measured values. The results show that the different combination modes of mills have different influence on the residence time of the pulverized-coal particles, effect of air staging in the burner region, flue gas temperature at the exit of the lower furnace and heat flux distribution on the furnace walls. Compared with the operating mode with all 6 mills in service, that with 5 mills in service and stopping the upper burners can increase the residence time of the pulverized-coal particles, resulting in the reduction of carbon content in the fly ash and the increase of pulverized-coal burnout. It can also enhance the effect of air staging in the burner region. Consequently, the NOx emission decreases. The flue gas temperature at the exit of the lower furnace can also decrease, being helpful to reducing the slagging tendency on the surfaces of the platen super-heaters.关键词
煤粉/超超临界锅炉/燃烧/优化/数值模拟分类
能源科技引用本文复制引用
方庆艳,汪华剑,陈刚,周怀春..超超临界锅炉磨煤机组合运行方式优化数值模拟[J].中国电机工程学报,2011,31(5):1-6,6.基金项目
国家自然科学基金项目(50806024,51025622) （50806024,51025622）
广东省重大科技专项(2008A080800029). （2008A080800029）
