Patent ID: 8302543
Filing Date: 2012-11-06
Classification: F23B,F23C,F23L,Y02E

Abstract:
1. A furnace for burning wood particles, comprising: an outer layer, having a substantially cylindrical shape; an inner layer, having a substantially cylindrical shape, disposed inside the outer layer and together forming a substantially cylindrically shaped pre-heating non-combustion and non-exhaust zone for pre-combustion air to pass before entering a combustion zone which is interior of the inner layer, through a longitudinally intermediate side port sized, located and configured to cause pre-combustion air to flow into said combustion zone interior of the inner layer along a line which is substantial tangential to said inner layer and then flow within said combustion zone interior to the inner layer in a substantially circular path; a bottom disposed under the inner layer and a top disposed above the inner layer; a bottom fed particulate fuel supply means configured to feed particulate fuel through a void in the bottom and further configured to automatically limit a height characteristic of fuel disposed in said combustion zone interior of the inner layer and above the bottom; and an exhaust means configured to transport heated air, unburned fuel and ash from inside of to outside of the inner layer, further comprising a centrally disposed heat exhaust tube extending downwardly into a middle section of the interior of the inner layer.