TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Combustor: The biomass energy combustor also comprises a fan; where a preheating chamber is further disposed outside of the air distribution chamber and relatively independent from the air distribution chamber; the preheating chamber is connected with the air inlet of the fan and formed with cold air inlets in the periphery of the preheating chamber; the air distribution chamber is connected with the air outlet of the fan; and the ratio of the pitches at the both ends of the carbon discharge auger is 2:1 to 5:1. In the biomass energy combustor, a charge auger is disposed at the charge hole; the pitch of the spiral blade of the charge auger is gradually reduced along a charge direction; the charge auger and the carbon discharge auger are driven by a speed-regulating motor; the height of the combustion chamber bottom from the both sides to the middle is gradually decreased; a carbon discharge groove is opened in the middle of the combustion chamber bottom; one end of the carbon discharge auger is disposed in the carbon discharge groove; the charge hole is located above the carbon discharge groove; one side of the combustion chamber is opened as an air outlet; the air distribution chambers are surrounded outside of the chamber wall in each of other directions; the air inlets are formed between the air distribution chambers and the combustion chamber; a main air hole connected with the air distribution chambers is opened in the chamber wall at one side opposite with the open side of the combustion chamber; an air distribution plate is disposed on the bottom of the combustion chamber; the combustion chamber bottom is separated from the air distribution chambers via the air distribution plate, and air distribution holes are formed in the air distribution plate; the bumps are uniformly distributed on the air distribution plate, whose lateral surfaces are opened to form the air distribution holes; and the included angle of the air distribution hole opening direction and the main air hole opening direction is 45-135 degrees .