Low-nitrogen wide-range low-calorific-value gas fuel furnace baking machine

The utility model relates to the technical field of kiln construction equipment, and particularly discloses a low-nitrogen wide-range low-calorific-value gas fuel furnace baking machine which comprises a columnar furnace body, a furnace end gas inlet pipe is arranged at one end of the furnace body in the axial direction, one end of the furnace end gas inlet pipe is connected with a gas source, and the other end of the furnace end gas inlet pipe extends into the furnace body; a middle sleeve is further arranged between the furnace wall of the furnace body and the furnace end air inlet pipe, a first air inlet facing the air outlet is formed between the middle sleeve and the air inlet pipe, a plurality of through holes are formed in the pipe wall, extending out of one end of the air inlet pipe, of the middle sleeve, and a third air inlet is formed between the middle sleeve and the furnace wall. The three layers of air inlets are mixed with low-calorific-value fuel for combustion in a successive mode, and the sit