Method for cooling solid residues of a combustion process

A waste combustion plant comprising a conveying device, the conveying device comprising:

• a conveyor belt with a conveying surface for conveying solid residues;
• and
• means for cooling the solid residues comprising a coolant supply for introducing a gaseous coolant and a coolant evacuation for extracting at least part of the coolant heated by the solid residues, wherein:
• the conveyor belt is essentially impermeable to the coolant,
• the conveyor belt is an endless conveyor belt that is guided around at least two rollers and forms a loop with a conveying strand and a return strand, the loop together with laterally arranged side walls enclosing a space to which are assigned the coolant supply and the coolant evacuation,
• the space between the conveying strand and the return strand is divided with a wall running essentially parallel to a plane of the conveying strand so as to form an interspace between the conveying strand and the wall, the coolant supply and the coolant evacuation being arranged in the interspace or being connected to the interspace, and
• the coolant supply and the coolant evacuation are configured such that the coolant is in contact only with a side of the conveyor belt oriented away from the conveying surface.

A method for cooling solid residues of a combustion process, the method comprising:

• depositing the solid residues onto a conveying surface of a conveyor belt of a conveying device;
• and
• conveying the solid residues in the direction of a solid residue outlet, wherein:
• during the conveying heat is transferred from the solid residues to a gaseous coolant introduced by way of a coolant supply,
• the conveyor belt is acted upon by the coolant only on its side oriented away from the conveying surface,
• the conveyor belt is essentially impermeable to the coolant,
• the conveyor belt is an endless conveyor belt that is guided around at least two rollers and forms a loop with a conveying strand and a return strand, the loop together with laterally arranged side walls enclosing a space to which are assigned the coolant supply and a coolant evacuation,
• the space between the conveying strand and the return strand is divided with a wall running essentially parallel to a plane of the conveying strand so as to form an interspace between the conveying strand and the wall, the coolant supply and the coolant evacuation being arranged in the interspace or being connected to the interspace, and
• at least part of the coolant heated by contact with the conveyor belt is extracted on the side oriented away from the conveying surface by way of the coolant evacuation.