【摘要】 结合电厂锅炉实际情况,设计出一套针对燃煤烟气污染物形成机理研究的多功能下行燃烧炉试验台,通过数值模拟对试验台在不同分级深度和不同分级位置下的煤粉自持燃烧进行研究。模拟结果表明:分级燃烧工况下的流场、温度场以及组分浓度场特性与分级燃烧试验特征非常符合。空气分级燃烧后NOx排放比不分级低200mg/m3,将空气中氮气替换成二氧化碳进行分级燃烧,其NOx排放值下降100 mg/m3。O2/CO2气氛下,NOx沿程生成和尾部排放都随着氧浓度从21%升高到30%而不断升高。更多还原

【Abstract】 In consideration of the actual situation of power plant,Multi-functional thermal downward furnace has been designed to study the formation mechanism of flus gas pollutants in coal combustion.Research the self-combustion characteristic of coal in different staging depth and position on the experimental table by numerical simulation.The simulation results show that the velocity,temperature and component concentration accord with the actual grading combustion characteristic.NOx emissions is 200 mg/m3 lower in staged combustion than unstaged.If the nitrogen is replaced by carbon dioxide in air-staged combustion,NOx emissions decrease by 100mg/m3.As the oxygen concentration increases from 21% to 30%in O2/CO2 atmosphere,NOx generation along furnace and the final emissions increase.更多还原