Method for automatized combustion and combustion apparatus

Combustion apparatus for automatized combustion of solid fuel, comprising a burner (1) with a horizontal or inclined reactor drum (1), which is rotatable by means of first motor (34), here called stirring motor, about the center axis of the burner for stirring the fuel in a combustion chamber in the drum, which is connected to a boiler (400) and has a feeding-in opening (63, 62) for fuel in the rear end of the burner outside of the boiler and an outlet opening (3) for completely or partly combusted flue gases in the front end of the burner which opens in a combustion chamber (41) inside the boiler which comprises a convection unit (402), from which a hot water conduit (403) extends, said combustion apparatus also including a fan (27) provided to be driven by a second motor (22) here called fan motor, for blowing combustion air into the burner, and a fuel charge feeder (200, 212) for fuel provided to be driven by a third motor (211), here called fuel charge feeding motor, and a control unit (300), and a measuring device (404) for registering the temperature of the water in the hot water conduit and for transmission of the measured temperature to the control unit, characterized in that said first, second, and third motors (34, 22, 211), i.e. the stirring motor, the fan motor, and the fuel charge feeding motor, are provided to be rotated, and the rates of said motors be regulated by command from the control unit in dependency of the measured value of the temperature of the water in the hot water conduit which is transmitted to the control unit and in dependency of the heating effect that the burner shall generate according to a number of different programs. stored in a computer in the control unit corresponding to the same number of different effect levels, which are divided between a lowest effect level (E1) and a top effect level (E8), in order that a certain desired temperature of the water in the hot water conduit shall be achieved and be maintained, and that the combustion apparatus is provided to work according to a certain program in the control unit corresponding to a certain effect generated by the burner as long as the temperature of the water in the hot water conduit is maintained at the desired temperature with a certain, pre-set accuracy, i.e. within said margins pre-set in the control unit, and that, if the pre-set maximum temperature would be exceeded or if the temperature would be lower than the pre-set minimum temperature, the control unit is shifted to a new program valid for the nearest, adjacent lower or higher effect level, respectively;

• wherein the lowest effect level (E1) is an effect level for keep-alive burning:
• wherein when the control unit shifts to a nearest lower effect level, the fan motor (22) is provided to continue to rotate during a certain pre-set time at the rotational rate that the fan had according to the program for the recently prevailing effect level in order to burn off any excess fuel in the burner before the rotation speed of the fan motor is shifted to that rotation speed which has been programmed in the program for next lower effect level, and to thereupon generate the effect which corresponds to that effect level;
• and
• wherein the fuel charge feeder (200, 212) is provided by means of the fuel charge feeding motor to feed charges of the fuel to a feeding-in device, that a fourth motor (41), here called feeding-in motor, is provided to drive the feeding-in device for feeding the charged fuel into the burner.