An equipment to produce activated carbon from carbon bio-precursors by physical activation composed by: an external fluidized bed reactor; an internal fluidized bed reactor; a silo for the vegetable carbon; a silo for the activated carbon; at least 3 cyclones (C1, C2 and C3); at least one pressure valve; at least one rotary valve for the activated carbon discharge; at least one rotary valve for feeding the vegetable carbon; at least one screw feeder; at least one blower; characterized in that: the internal fluidized bed reactor it is inserted in the external fluidized bed reactor in a concentric arrangement, the concentric arrangement allowing a higher temperature stability and higher energetic efficiency; the clean gas outlet of the activated carbon discharge cyclone is connected to the line for collecting the discharge gas; the internal fluidized bed reactor is equipped with a steam feeding tube, that feeds, trough the nozzle, water steam to the central part of the internal fluidized bed reactor; the internal fluidized bed reactor is equipped with a water steam feeding tube; the internal fluidized bed reactor is supplied with superheated water steam through the steam duct; the internal fluidized bed reactor and the cyclone are connected through line which is equipped with the pressure valve, that controls the pressure inside the internal fluidized bed reactor, the line serving as exhaust line for synthesis gas from the internal fluidized bed reactor; the external fluidized bed reactor and the internal fluidized bed reactor are in heat transfer communication through thin walls and fins; the external fluidized bed reactor and the cyclone are connected through the line, the line serving as exhaust line for combustion gases from the external fluidized bed reactor; the vegetable carbon silo and the screw feeder are connected through the valve that feeds the reactor with vegetable carbon using the line. an external fluidized bed reactor; an internal fluidized bed reactor; a silo for the vegetable carbon; a silo for the activated carbon; at least 3 cyclones (C1, C2 and C3); at least one pressure valve; at least one rotary valve for the activated carbon discharge; at least one rotary valve for feeding the vegetable carbon; at least one screw feeder; at least one blower; characterized in that: the internal fluidized bed reactor it is inserted in the external fluidized bed reactor in a concentric arrangement, the concentric arrangement allowing a higher temperature stability and higher energetic efficiency; the clean gas outlet of the activated carbon discharge cyclone is connected to the line for collecting the discharge gas; the internal fluidized bed reactor is equipped with a steam feeding tube, that feeds, trough the nozzle, water steam to the central part of the internal fluidized bed reactor; the internal fluidized bed reactor is equipped with a water steam feeding tube; the internal fluidized bed reactor is supplied with superheated water steam through the steam duct; the internal fluidized bed reactor and the cyclone are connected through line which is equipped with the pressure valve, that controls the pressure inside the internal fluidized bed reactor, the line serving as exhaust line for synthesis gas from the internal fluidized bed reactor; the external fluidized bed reactor and the internal fluidized bed reactor are in heat transfer communication through thin walls and fins; the external fluidized bed reactor and the cyclone are connected through the line, the line serving as exhaust line for combustion gases from the external fluidized bed reactor; the vegetable carbon silo and the screw feeder are connected through the valve that feeds the reactor with vegetable carbon using the line. the internal fluidized bed reactor it is inserted in the external fluidized bed reactor in a concentric arrangement, the concentric arrangement allowing a higher temperature stability and higher energetic efficiency; the clean gas outlet of the activated carbon discharge cyclone is connected to the line for collecting the discharge gas; the internal fluidized bed reactor is equipped with a steam feeding tube, that feeds, trough the nozzle, water steam to the central part of the internal fluidized bed reactor; the internal fluidized bed reactor is equipped with a water steam feeding tube; the internal fluidized bed reactor is supplied with superheated water steam through the steam duct; the internal fluidized bed reactor and the cyclone are connected through line which is equipped with the pressure valve, that controls the pressure inside the internal fluidized bed reactor, the line serving as exhaust line for synthesis gas from the internal fluidized bed reactor; the external fluidized bed reactor and the internal fluidized bed reactor are in heat transfer communication through thin walls and fins; the external fluidized bed reactor and the cyclone are connected through the line, the line serving as exhaust line for combustion gases from the external fluidized bed reactor; the vegetable carbon silo and the screw feeder are connected through the valve that feeds the reactor with vegetable carbon using the line.