NOVELTY - The apparatus for biomass e.g. switchgrass pellets torrefaction, comprises a serpentine elongated housing further includes a first, a second and a third generally U-shaped axial portion, each having first and second axial extremities and an intermediate section. The first and second axial extremities are disposed in normal use at a higher elevation than the first and second axial extremities. The intermediate section is configured for holding a liquid. An axial movement of wood from the first axial extremity to the second axial extremity immerses the wood in a liquid.    USE - The apparatus is useful for biomass e.g. switchgrass pellets torrefaction, which is useful as a fuel source e.g. fossil fuel such as coal in the electric power plants, for home heating and stoves and for the production of food products.    ADVANTAGE - The apparatus is simple, safe and efficient, and ensures less manufacturing time for producing torrefied wood. The switchgrass provides a doubling of production over hardwood and softwood sawdust, when it is used as a pelleting material in existing mills.    DETAILED DESCRIPTION - The apparatus for biomass torrefaction, comprises a serpentine elongated housing further includes a first, a second and a third generally U-shaped axial portion, each having first and second axial extremities and an intermediate section. The first and second axial extremities are disposed in normal use at a higher elevation than the first and second axial extremities. The intermediate section is configured for holding a liquid. An axial movement of wood from the first axial extremity to the second axial extremity immerses the wood in a liquid in the intermediate section. The second generally U-shaped axial portion is coupled to the first generally U-shaped axial portion by a first elevated axial section of the housing. The third generally U-shaped axial portion is coupled to the second generally U-shaped axial portion. The first, second and third generally U-shaped axial portions are disposed in fluid communication. The first, second and third axial portions are a pre-heat portion, a heat treatment section, and a cooling section respectively. First and second vents are included in the first and second elevated axial sections respectively, to escape the moisture and volatile organic compounds. Wire mesh enclosures are arranged for containing biomass in a pellet form. Each of the enclosures is dimensioned and configured or axial movement in the serpentine elongated housing. A conveyor is arranged for serially moving wire mesh enclosures through the axial extent of the serpentine elongated housing. The conveyor includes elongated members joining respective wire mesh enclosures. A succession of alternating elongation members and wire mesh enclosures are joined together. Each of the elongated members is a chain. A heat recovery system is arranged for recovering heat added to an associated biomass that is heat-treated in the apparatus. An apparatus for the temperature of an associated heat transfer fluid is included within the second portion to a temperature of 380-550degreesF. INDEPENDENT CLAIMS are included for:    (1) a method for biomass torrefaction; and    (2) an article of manufacture.