A boiler 7 includes: a combustion furnace 100 having a combustion chamber 100F therein; a heat exchanger 140 configured to transfer, to water, thermal energy obtained by burning a solid fuel in the combustion chamber 100F; a belt conveyor 120 including a movable loader 120a, disposed on a bottom of the combustion chamber 100F, and configured to move the solid fuel on the movable loader 120a in the combustion chamber 100F; and a fuel supplier 130 connected to a fuel supply port 111a that communicates an inside and an outside of the combustion furnace 100. The belt conveyor 120 has a starting point below the fuel supply port 111alb . The fuel supplier 130 includes a thickness adjuster 131 that adjusts a thickness of the solid fuel on the movable loader 120a of the belt conveyor 120.

The present invention relates to a method for incineration of combustible waste during the manufacture of cement clinker where cement raw meal is preheated and calcined in a preheater (1) with a calciner (3), burned into clinker in a kiln (5) and cooled in a subsequent clinker cooler (7), in which method the waste is incinerated in a separate compartment (9) subject to simultaneous supply of hot air, the exhaust gases produced during the waste incineration process being vented to the preheater for heating the cement raw meal, and the slag generated during the waste incineration process being extracted from the compartment, the waste is introduced via a waste inlet (11) onto a supporting surface (21) incorporated in the compartment (9) and in that, during incineration, the waste is transported through the compartment to the outlet (23) of the compartment along a circular path, characterized in that the compartment (9) is arranged at a distance from said calciner (3) or a preheater tower by means of a material chute (40), said material chute (40) enters a downward sloping duct, said duct carries exit gas from said compartment (9) and non-combustible material from waste fuel firing in said compartment (9) down into the calciner or preheater tower.

The present invention relates to a method for incineration of combustible waste during the manufacture of cement clinker where cement raw meal is preheated and calcined in a preheater (1) with a calciner (3), burned into clinker in a kiln (5) and cooled in a subsequent clinker cooler (7), in which method the waste is incinerated in a separate compartment (9) subject to simultaneous supply of hot air, the exhaust gases produced during the waste incineration process being vented to the preheater for heating the cement raw meal, and the slag generated during the waste incineration process being extracted from the compartment, the waste is introduced via a waste inlet (11) onto a supporting surface (21) incorporated in the compartment (9) and in that, during incineration, the waste is transported through the compartment to the outlet (23) of the compartment along a circular path, characterized in that the compartment (9) is arranged at a distance from said calciner (3) or a preheater tower by means of a material chute (40), said material chute (40) enters a downward sloping duct, said duct carries exit gas from said compartment (9) and non-combustible material from waste fuel firing in said compartment (9) down into the calciner or preheater tower.