Downdraft channel biomass gasifier

A biomass downdraft channel gasifier having a means for filling said gasifier with biomass comprising:

• (a) an enclosed housing defining a biomass gasification chamber;
• (b) two triangularly-shaped hollow air ducts for the transmittal of air, each positioned upon opposite sides of said biomass gasification chamber and each having a downwardly sloping side having an apex edge, said downwardly sloping sides extending towards each other so that an open-bottom V-shaped channel is formed therebetween for support of said biomass material, having downwardly converging sides, said air ducts having a plurality of air jet openings along said apex edges for outlet of said air to provide oxygen for gasification of said biomass;
• (c) a grate member placed in said gasification chamber below said air ducts which allows passage of biomass ash and gaseous substances which have flowed down through said channel yet supports biomass fuel and char;
• (d) means defining air entrance openings in adjacent ends of said air ducts for receiption of said air;
• (e) means defining an outlet for the producer gas generated in the said gasification-combustion chamber.

A biomass downdraft channel gasifier having a means for filling said gasifier with biomass comprising:

• (a) an enclosed housing defining a biomass gasification chamber;
• (b) at least two generally triangularly-shaped hollow air ducts for the transmittal of primary combustion air and secondary combustion air spaced across the width of said gasification chamber, each of said air ducts having an apex edge and at least one sloping side diverging downward from said apex edge, with each of said sloping sides extending convergingly towards a sloping side of an adjacent air duct to define an open-bottom V shaped channel therebetween for support of said biomass material, said air ducts each having air jet openings disposed longitudinally along their apex edge for outlet of said primary combustion air to said gasification chamber to provide oxygen for gasification of said biomass, said air ducts each having means defining air exit openings for the outlet of said secondary combustion air from said air ducts;
• (c) a grate member placed in said gasification chamber below said air ducts which allows passage of gaseous substances and biomass ash, yet supports biomass fuel and char;
• (d) means defining air entrance openings in adjacent ends of said air ducts for the reception of said primary combustion air;
• (e) means defining air entrance openings in adjacent ends of said air ducts for the reception of said secondary combustion air;
• (f) means defining one or more outlets for the producer gas generated in said gasification chamber.