Denitrification system for thermal desorption production line

The invention discloses a denitrification system for a thermal desorption production line. The system comprises an ultralow NOx type burner, a circulatory flue gas filling mechanism and a combustion-supporting air filling mechanism, wherein the ultralow NOx type burner comprises a circulatory flue gas inlet, a combustion-supporting air inlet and a natural gas inlet; the circulatory flue gas filling mechanism comprises a flue gas fan; the combustion-supporting air filling mechanism comprises a combustion-supporting fan which is connected with the combustion-supporting air inlet through a pipeline. The denitrification system for the thermal desorption production line is simple and reasonable in structure and convenient to mount and use. The ultralow NOx type burner is adopted to replace a burner of an original rotary kiln, fuel gas is rapidly and uniformly mixed with air and flue gas by adopting an injection mode, and reduction of NOx generation is facilitated. The fuel gas and air are sprayed out at a high spe