甲烷掺氢微混燃烧器功率放大设计分析OA

[Objectives]Power amplification represents a necessary step in transitioning burners from laboratory experiments to engineering applications.Micro-mixed combustion is a highly promising approach for methane hydrogen-doped combustion.However,there is limited research on power amplification for this type of burner within current design and development frameworks.Therefore,research is conducted specifically on megawatt-scale burners.[Methods]Based on field experiments,the amplification characteristics of methane hydrogen-doped micro-mixed combustion in a megawatt-scale gas boiler are investigated using numerical simulation.Comparisons between experiment and simulation of a micro-diffusion burner show that increasing hydrogen doping ratio increases the overall combustion reaction rate,resulting in increased outlet temperature and NOx emissions.Based on the characteristics of hydrogen combustion,a power amplification design principle using constant nozzle flow velocity and constant furnace volumetric heat load is proposed.Additionally,two design schemes—fixed nozzle number and fixed nozzle diameter—are compared in terms of combustion thermal characteristics of micro-mixed hydrogen-doped fuel at different power levels.[Results]With the power amplification of the burner,the overall combustor temperature and NOx emissions decrease,and the rate of decrease gradually diminishes.Differences are observed in axial temperature,velocity distribution,and outlet NOx emissions between the two schemes.However,as the power increases,the difference between the two schemes gradually diminishes.Selecting appropriate burner nozzle and furnace scale-up design schemes can effectively reduce NOx emissions.[Conclusions]The findings can provide insights for the design of high-power micro-mixed hydrogen-doped combustion equipment.