煤粉炉掺烧芦竹NOx生成特性模拟研究OA

Coal-fired power generation coupled with biomass is one of the efficient carbon-reduction technologies for coal-fired units.As a typical energy plant,arundo donax has the characteristics of high yield,strong environmental adaptability and high calorific value,and can be used for large-scale coal-fired power generation.To investigate the effect of co-firing arundo donax in a pulverized-coal boiler on NOx emissions and explore the migration pathways of fuel nitrogen during the co-combustion of coal and arundo donax,a co-combustion reaction model of arundo donax and coal was established with a two-stage plug flow reactor(PFR).The formation characteristics and reaction mechanisms of nitrogen oxides during co-combustion of the arundo donax and coal in a pulverized-coal boiler were studied,focusing on exploring the influences of co-firing ratio,over-fire air(OFA)ratio,and OFA position on the formation characteristics of nitrogen oxides.The results show that the NOx emission can be reduced by co-firing arundo donax,and the mass concentration of NOx decreases with the increase in co-firing ratio of arundo donax.The NOx conversion rate and NOx mass concentration first decrease and then increase with the increase in over-fire air ratio,and there is an optimal over-fire air ratio(around 33%)to minimize NOx emissions.Delaying the position of the OFA leads to a decrease in both the NOx conversion rate and NOx mass concentration.By studying the NOx formation characteristics and the nitrogen migration pathways during co-combustion of coal and arundo donax,theoretical guidance can be provided for parameter setting and reducing exhaust NOx emissions in the co-combustion of arundo donax for coal-fired power generation.