System for ash recycling

Abstract

A method of operating a combustion system includes at least the following steps: removing ashes from a combustion boiler, compacting the ashes, pulverizing the ashes, and feeding at least a part of the ashes into the combustion boiler, wherein the hardness of the ashes is deliberately set during the steps of removing the ashes or compacting the ashes. Furthermore, a particularly suitable device for implementing the method is disclosed.

1 . A method for operating a combustion plant, comprising at least the following steps:
 a) extraction of ash from a combustion boiler,   b) solidification of the ash,   c) crushing of the ash, and   d) feed of at least part of the ash into the combustion boiler,   the hardness of the ash being set in a directed manner during step a) or b).   
     
     
         2 . The method as claimed in  claim 1 , in which the ash has a mean hardness bandwidth of less than 4 prior to step d). 
     
     
         3 . The method as claimed in  claim 1 , in which, additionally, fuel, in particular coal, is fed between step b) and c). 
     
     
         4 . The method as claimed in  claim 1 , in which, to carry out step a), internal cleaning of the combustion boiler is performed. 
     
     
         5 . The method as claimed in  claim 4 , the ash being treated with water. 
     
     
         6 . The method as claimed in  claim 1 , in which at least one operating parameter of the combustion boiler is detected and is compared with a characteristic value which is characteristic of the hardness of the ash, treatment of the ash in the combustion boiler and/or extraction being initiated when a threshold value is reached. 
     
     
         7 . An apparatus, comprising a combustion plant with at least the following elements: a combustion boiler with an outlet for ash, a conveyor for transporting away and cooling the hot ash, a crusher for the cold ash, and an inlet of the combustion boiler for the ash, these elements cooperating in such a way that a circuit is formed for at least a part of the ash. 
     
     
         8 . The apparatus as claimed in  claim 7 , sensors, cleaning apparatus and a control being provided. 
     
     
         9 . The apparatus as claimed in  claim 7 , the ash being routed via a coal conveyor and a coal crusher.