NOVELTY - Processing biological sludge involves using an integrated device, where the device comprises stove, drying furnace and charring furnace. The stove comprises a control loop and combustion air regulation loop. The relationship between the amount of oil is regulated based on cross limiting. The programmable Logic Controller (PLC) controller issues a corresponding control signal. The control loop fuel and combustion air regulation loop allows conditioning of high pressure fuel pump and combustion air blower according to the corresponding control signal.    USE - Method for processing biological sludge (claimed).    ADVANTAGE - The method enables to process biological sludge which saves the labor cost and improves the work efficiency.    DETAILED DESCRIPTION - Processing biological sludge involves using an integrated device, where the device comprises stove, drying furnace and charring furnace. The stove comprises a control loop and combustion air regulation loop. The relationship between the amount of oil is regulated based on cross limiting. The programmable logic controller (PLC) controller issues a corresponding control signal. The control loop fuel and combustion air regulation loop allows conditioning of high pressure fuel pump and combustion air blower according to the corresponding control signal. The relationship between the cross-limiter in the stove is regulated to take combustion air flow rate to the highest limits and the high-pressure fuel pump is then opened, until the temperature of the stove rises to a first target temperature. The oil and gas flow rate are dropped below a minimum amplitude before cooling. The combustion air flow is then reduced until the hot air the furnace temperature is lowered to a second target temperature. The drying furnace comprises cascade proportional integral derivative (PID) controller, the main controller, sub-controllers, PID control port, PLC controller, the master variable furnace and deputy variable gas flow. The master PLC controller receives the temperature value and set value through the PID operation and sets the value of the operational result as deputy controller. The obtained value is compared with the number of traffic values and PID operation by the sub-controller, and the end result is provided as an output to the inverter. The inverter performs a number of revolutions to control the rotational speed of the vacuum pump, in order to ensure that the furnace temperature is stabilized at the target temperature. The charring furnace comprises cascade PID control, the main controller and sub-controllers, PID control port PLC controller, the master variable furnace and deputy variable gas flow. The PLC controller receives the temperature value and set value through the PID operation and sets the value of the operational result as deputy controller. The obtained value is compared with the flow rate and represents the number of deputy controller by PID operation, and the final result is provided as an output to the inverter. The fan drive performs a number of revolutions to control the rotational speed of the high temperature, in order to ensure that the furnace temperature is stabilized at the target temperature.