Compact two-stage efficient low-NOx radiant tube combustion system

The utility model relates to a compact two-stage high-efficiency low NOx radiant tube combustion system, including burner, heat exchanger, shell, flue gas reflux device, gas collection chamber, heat exchange tube and radiant tube, shell is divided into air shell and secondary shell, the heat exchanger has two types, including primary heat exchanger and secondary heat exchanger, through reasonable arrangement of the above structure, the heat exchange tube combustion efficiency is improved. According to the utility model, efficient heat exchange can be realized, the utilization rate of energy can be improved, the use of fuel can be reduced, and meanwhile, a flue gas backflow device is integrated, so that a backflow structure can be formed, the temperature of a flame area of the burner can be reduced, the generation of NOx gas can be reduced, and the emission of pollutants can be reduced. 本实用新型涉及一种紧凑型两级高效低NOx辐射管燃烧系统，包括烧嘴、换热器、壳体、烟气回流装置、集气室、换热管与辐射管，所述壳体分为空气壳体与二级壳体，所述换热器设有两种，分别为一级换热器与二级换热器，通过合理设置上述结构，本实用新型可以实现高效换热，