The invention relates to an incineration plant for solid material having a combustion material inlet (1) through which solid material can be introduced, a feed shaft (2) in which the solid material is introduced and which leads to a combustion chamber (3) in which the solid material is combusted, a combustion grate (4) with which the solid material and combusted solid material can be conveyed through the combustion chamber (3), a primary air supply (5) below the top of the combustion grate, characterized in that the incineration plant comprises at least one adjusting device (6), wherein the adjusting device (6) is pivotably mounted and can be pivoted in a first position and a second position to alter the amount of solid material advanced from the feed shaft (2) to the combustion chamber (3).