Combustion system of reduction furnace

The utility model discloses a reduction furnace combustion system which comprises a reduction furnace body, a gas pipeline, a combustion-supporting air pipeline, a smoke exhaust pipeline and a low-nitrogen combustion system. The low-nitrogen combustion system at least comprises one of a soot branch pipe, a backflow smoke pipe, an empty smoke branch pipe and an air distribution pipe, one end of the soot branch pipe and one end of the smoke branch pipe are communicated with the smoke exhaust pipeline, the other end of the soot branch pipe and the other end of the smoke branch pipe are communicated with the reduction furnace body, smoke is introduced into the reduction furnace body to reduce the combustion intensity, and therefore generation of NOx is reduced; one end of the backflow flue gas pipe is communicated with the smoke exhaust pipeline, and the other end of the backflow flue gas pipe is communicated with the combustion-supporting air pipeline, so that flue gas is mixed with combustion-supporting air, th