Method for mechanical stoking in firing installations and firing installation

Abstract

A method for mechanical stoking in firing installations and a firing installation is provided. Fuel is applied to a grate using a mechanical stoker, the grate being disposed in a firing chamber, wherein the mechanical stoker is oriented opposite a delivery direction of the grate. The fuel is introduced directly below a firing chamber ceiling, viewed in the delivery direction of the grate before the end of the grate such that a burnout zone, which does not have fresh fuel applied thereto, is created on the grate between the mechanical stoker and the end of the grate.

1 .- 8 . (canceled) 
     
     
         9 . A method for mechanical stoking in firing plants including a combustion chamber with a combustion chamber cover, comprising:
 depositing fuel onto a grate of the combustion chamber by a mechanical spreader stoker;   orienting a direction of throw opposite to the direction of conveyance of the gate,   wherein the fuel is introduced immediately below the combustion chamber cover, and, viewed in the direction of conveyance of the grate, ahead of an end of the grate, such that a burnout zone is created between the mechanical spreader stoker and the end of the grate, wherein no fuel is deposited in the burnout zone;   offsetting an upper part of a front wall of the combustion chamber inwardly into the combustion chamber by a lowered part of the combustion chamber cover,   wherein the fuel is introduced at a top end of an upper front wall; and   providing the mechanical spreader stoker with a thrower wheel including an at least approximately vertical axis of rotation.   
     
     
         10 . The method as claimed in  claim 9 , wherein a length of the burnout zone is between 15% and 40% of a length of the grate. 
     
     
         11 . The method as claimed in  claim 9 , wherein a length of the burnout zone is between 20% and 40% of a length of the grate. 
     
     
         12 . The method as claimed in  claim 9 , further comprising:
 extracting combustion residues from the combustion chamber at the end of the grate.   
     
     
         13 . The method as claimed in  claim 9 , wherein the grate is a forward-acting reciprocating grate. 
     
     
         14 . A firing plant, comprising:
 a combustion chamber;   a combustion chamber cover;   a grate disposed in the combustion chamber;   a mechanical spreader stoker, wherein   fuel is deposited onto the grate opposite to a direction of conveyance of the grate, the fuel is introduced by the mechanical spreader stoker immediately below the combustion chamber cover, and, viewed in the direction of conveyance of the grate, ahead of the end of the grate such that during operation of the mechanical spreader stoker a burnout zone is created between the mechanical spreader stoker and an end of the grate, no fuel being deposited in the burnout zone,   an upper part of a front wall of the combustion chamber is offset inwardly into the combustion chamber by a lowered part of the combustion chamber cover,   an opening is provided at a top end of an upper front wall for introducing the fuel, and   the mechanical spreader stoker comprises a thrower wheel with an at least approximately vertical axis of rotation.   
     
     
         15 . The firing plant as claimed in  claim 14 , wherein a length of the burnout zone is between 15% and 40% of a length of the grate. 
     
     
         16 . The firing plant as claimed in  claim 14 , wherein a length of the burnout zone is between 20% and 40% of a length of the grate. 
     
     
         17 . The firing plant as claimed in  claim 14 , further comprising:
 a discharge at the end of the grate for extracting combustion residues from the combustion chamber.   
     
     
         18 . The firing plant as claimed in  claim 14 , wherein the grate is a forward-acting reciprocating grate.