A bidirectional flow heating
internal heating rotary
carbonization furnace and its
process control method are disclosed, relating to a
carbonization apparatus. It includes a feeder, a bidirectional flow
rotary kiln, a high-temperature gas duct, a
discharge cabinet, a cooling carbon collector, a low-temperature gas duct, a medium-temperature gas duct, a two-stage
combustion furnace, a high-temperature
flue, and a circulating control
piping system.
Raw material carbonization undergoes two stages: a counter-current carbonization stage, mainly completed in the counter-current carbonization furnace section, where the
raw material flows downwards and the
flue gas flows upwards, and most of the
moisture in the
raw material is gasified in this stage; and a co-current carbonization stage, mainly completed in the co-current carbonization furnace section, where both the
raw material and
flue gas move downwards, and most of the
organic matter in the raw material is decomposed in this stage. A
process control method is provided, including ignition, heating, feeding carbonization, gas ring formation, two-stage
combustion, energy self-supply, control of carbonization temperature, and control of gas flow rate. Compared with previous carbonization systems, this method omits the additional
drying step, simplifies equipment, and ensures the stability of the carbonization effect.