变负荷工况下燃煤耦合生物质燃烧及污染物排放规律研究OA

With the transformation of the global energy structure,coal co-firing with biomass has become an important approach to reducing carbon emissions and mitigating environmental pollution.Moreover,as the shares of wind and photovoltaic power generation continue to increase,the demand for flexible load regulation in power grids grows,making medium-and low-load operation be an important means for generating units to adjust power supply.Studying coal co-firing with biomass for power generation under variable load conditions can help reduce carbon emissions and meet peak-shaving requirements,thereby further unlocking the low-carbon potential of the units.To achieve stable and safe operation of boilers co-firing biomass under medium-and low-load conditions,a 350 MW boiler is selected as the research object.Numerical simulations are conducted using Fluent software to comprehensively analyze the effects of load,co-firing ratio,etc.,on the distribution of key boiler operating parameters and pollutant emissions.Furthermore,for the condition of 50％load with 50％biomass co-firing,the influence mechanisms of excess air ratio,air distribution ratio at the main combustion zone,and biomass blending mode on boiler operation are investigated.Co-firing biomass can effectively reduce NOx emissions from boiler operation.Under medium-and low-load conditions,appropriately increasing the excess air ratio,adjusting the air distribution ratio,and optimizing the fuel feeding mode can effectively improve combustion efficiency and reduce pollutant emissions,which provides guidance for the safe and stable operation of utility boilers under medium-and low-load conditions.