管式加热炉掺氢燃烧NOx和CO2排放特性研究OA

Objective This study aims to address the challenge of synergistic control of NOx and CO2 emissions arising from the complex internal structure and diverse fuel gas compositions in tubular heating furnaces.Method A tubular heating furnace for hydrogenation feed was selected as the research object.A coupled heat transfer model between the combustion side and the tube side was established.Full-furnace numerical simulations were then conducted to investigate the temperature field and NOx/CO2 emission characteristics under different hydrogen blending ratios in methane-and oil-rich tail gas combustion.In addition,the DO and P1 radiation models were compared.Result The P1 radiation model showed better computational consistency compared with the DO radiation model.As the hydrogen blending ratio increased,the combustion reaction zone of the methane-and oil-rich tail gas shifted forward,leading to an overall rise in the average flue gas temperature along the height direction inside the furnace,as well as an increase in the maximum combustion temperature in the radiant section.Meanwhile,the O2,CO,and CO2 concentrations at the radiant section outlet all exhibited a decreasing trend.Conclusion Increasing the hydrogen blending ratio helps to improve the temperature field distribution inside the furnace and reduce CO2 emissions,but it promotes NOx formation.Therefore,in practical operation,a reasonable hydrogen blending ratio should be determined by comprehensively considering NOx and CO2 emission levels.This study provides a theoretical basis and engineering reference for low-carbon combustion optimization and synergistic pollutant control in industrial tubular heating furnaces.