NOVELTY - The method involves directing gas stream from degasser to combustion chamber. The gases are burned in combustion chamber to yield carbon di-oxide and steam. The torrefied biomass dust streams from unit separating solid particles from gas phase. A portion of torrefied biomass dust stream is directed to combustion chamber. The water is formed in degasser intended for steam production is fed to steam superheater. The water is discharged from degasser excess tank. The superheated steam from superheater is directed to reactor (12).    USE - Method for conducting torrefaction process of biomass material of wood, agricultural residue and fast-growing tree.    ADVANTAGE - The chemical substances are easily discharged into environment from installation structure. The characteristics of biomass is improved effectively.    DETAILED DESCRIPTION - The torrefied biomass dust streams from cyclone and bag filter are combined and cooled to temperature of about 80-110 degrees C. The portion of torrefied biomass dust stream is directed to the combustion chamber. INDEPENDENT CLAIMS are included for the following:    (1) installation structure for conducting biomass torrefaction process, has torrefied biomass outlet that is connected to conduits connecting torrefied biomass outlet of reactor and combustion chamber. An absorbing unit has gas inlet that is connected to gas outlet of unit separating solid particles from gas phase. The gas outlet is provided for discharging absorption process products. A condenser (17) has an inlet that is connected to gas outlet of absorbing unit and outlet. A degasser (18) has an inlet that is connected to gas outlet of condenser. A combustion chamber has a gas inlet that is connected to gas outlet of degasser. A superheated steam outlet is connected to torrefaction and drying agent inlet of reactor. The torrefied biomass outlet of reactor is connected to a cooling unit (20). A bag filter has an inlet that is connected to gas outlet of cyclone. The gas outlet is connected to gas inlet of absorbing unit and torrefied biomass outlet. The torrefied biomass outlets of cyclone and bag filter are connected to cooling unit; and    (2) method for purifying flue gases from torrefaction process, involves dedusting of flue gas stream from reactor in unit separating solid particles from gas phase. The gas-water mixture is directed from condenser to the degasser. The water is separated from gases. The gas stream is directed from degasser to combustion chamber.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the (Drawing includes non-English language text)    Reactor (12)    Separation unit (16)    Condenser (17)    Degasser (18)    Cooling unit (20)