TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The afterheat boiler further comprises a second heat exchange pipeline with a second gas inlet and a second gas outlet. The heating device transfers the smoke from the combustion to the second gas inlet by a first smoke pipeline. The heating device transfers the smoke from the combustion to the drying device by the second smoke pipeline. The biomass pyrolysis subsystem comprises a second activating device for activating the residual biomass carbon from the pyrolysis of the biomass pyrolysis furnace. The water vapor from the afterheat boiler is transferred to the second activating device by a first water vapor pipeline. The water vapor from the afterheat boiler is transferred to the first activating device by a second water vapor pipeline. The water vapor from the afterheat boiler is transferred to the outer wall of the stirring device by a third water vapor pipeline. The carbonizing device comprises a combustion device with an air inlet and an air outlet, a double-cylinder rotary carbonizing furnace and a fuel gas-smoke loop structure. The double-cylinder rotary carbonizing furnace is composed of a rotary inner cylinder, a rotary outer cylinder, a heating device in the inner cylinder and a driving device for driving the inner cylinder and outer cylinder to rotate, in which the outer cylinder is sleeved outside the inner cylinder. The fuel gas-smoke loop structure transfers the fuel gas from the heating of the carbon powder of the carbonizing furnace to a combustion device to combust and heating the carbon powder by the smoke from the fuel gas. The fuel gas-smoke loop structure comprises multiple openings of the carbonizing furnace and a gas pipeline between the carbonizing furnace and combustion device. The multiple openings of the carbonizing furnace includes a first opening at the front end of the inner cylinder, a second opening at the tail end of the inner cylinder and a third opening at the tail end of the outer cylinder. The second opening is sleeved inside the outer cylinder. The gas pipeline includes a first gas pipeline connected with the first opening and a second gas pipeline connected with the third opening. The other end of the first gas pipeline is connected to the air inlet or air outlet of the combustion device. The other end of the second gas pipeline is connected to the air outlet or air inlet of the combustion device.