NOVELTY - The reactor vessel (10) has discharge opening that is provided in the lowermost tray so as to transfer the biomass (12) to a pile of the biomass in the vessel. The gas extraction openings are formed in the vessel wall. One of the gas extraction openings is aligned with the gas extraction passage and another one of the gas extraction openings is provided at an elevation below the lowermost tray assemblies (16,18,20) and above the pile of the biomass. A bottom discharge port (26) is provided in the vessel portion so as to discharge torrefied biomass.    USE - Pressurized torrefaction reactor vessel for biomass material such as lignocellulosic material.    ADVANTAGE - The torrefaction of biomass material can be performed so as to obtain efficient fuel. The pressurization of the gas can increase the mass of the gas for given volumetric flow rate. The pressurized reaction vessel can be provided with smaller volume due to the use of compressed gas. The ability of gas to transfer heat to biomass is proportional to the mass of the gas, so that the gas can heat the biomass quickly.    DETAILED DESCRIPTION - The pressurized vessel has a vessel wall that is extended vertically. A rotatable shaft is extended vertically down through a top of the vessel. The scraper devices (56) are provided at a different elevation within the vessel and coaxial to the shaft. The tray assembly is associated with one of the scraper devices such that the scraper device is immediately above a tray of the tray assembly. A gas extraction passage is formed below the tray, and a gas injection passage is formed above the tray. The tray is an open mesh or otherwise permeable to gas flow and impermeable to passage of biomass through the tray. Each tray is provided with discharge opening to transfer biomass from the tray and down to a tray of a lower one of the tray assemblies. The tray assemblies and scraper devices are interleaved and stacked vertically along the shaft of the vessel. The trays are formed one of perforated steel mesh or a drilled steel plate. The perforations in the tray are drilled holes or laser cut holes or slots. The holes or slots in the tray are provided with increasing cross-sectional area in downward direction. The slots or holes are provided with constant cross-sectional upper region and a lower region of the increasing cross- sectional area. The upper rim of the holes or slots is beveled along a trailing portion of the rim. One of the tray assemblies is provided with solid bottom plate. The gas injection passage for the one of the tray assemblies is extended between the tray and solid bottom plate of the next higher tray assembly. The gas distribution manifold penetrates or is mounted to the bottom plate and is coupled to the gas injection passage. The gas distribution manifold is one of a fabricated metal structure and includes a pipe fitting. A nozzle is provided to distribute gas above the biomass on a tray of a lower tray assembly. The nozzles are provided to direct gas to flow uniformly over the biomass on a tray of the next lower tray assembly. Each tray is an annular array of pie shaped tray segments. The discharge opening is a pie shaped opening in the annular array. The baffle plates are extended radially in the gas extraction passage. The baffle plates are attached to tray and bottom plate of the tray assembly. Each pie shaped tray assembly is provided with side plates. The side plates are extended vertically between the tray and the bottom plate. A cleaning nozzle is directed to one of the trays so as to direct pressurized fluid flow against the perforations, slots, holes or mesh of the tray. The cleaning nozzles are mounted to a lower edge of a blade of the scraper device. The gas injection passage is connected with gas injection port in the wall of the vessel. One of the gas extraction openings for each segment of the tray assembly is associated with the extraction openings. The blades of scraper device are extended from the shaft towards the wall of the vessel. The blades are arranged angularly around the shaft. The scraper device is rotated with the shaft. The rotation of the scraper devices is performed to move the biomass over the tray immediately below the scraper device. A central hub is affixed to the shaft. The blades of the scraper device extend outward from the hub. The outward ends of the blade are connected to a collar. The collar is proximate to the wall of the vessel. The lower edge of blade is set with specific range. The blades are inclined from 0-20 degrees in the direction of rotation of the scraper device with respect to a radial line corresponding to the blade. The blades are curved or swept in a direction of rotation of the scraper device. A radial slot is located to receive a high pressure passage. The nozzles are provided in passage to direct a gas against the tray below the blade or suction ports to apply suction to the tray. The area below the trays is provided with a torrefaction reaction zone (22) and a cooling zone (24) below the torrefaction reaction zone.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the pressurized torrefaction reactor vessel.    Pressurized torrefaction reactor vessel (10)    Biomass (12)    Tray assemblies (16,18,20)    Torrefaction reaction zone (22)    Cooling zone (24)    Bottom discharge port (26)    Scraper device (56)