Roller grate

Abstract

A grate covering for a roller grate of an incineration furnace has a furnace space, the grate covering includes a plurality of metallic grate bars arranged on a carrying structure of the roller grate such that they form an outer surface of the roller grate and are exposed directly to the furnace space. The grate bars have a cavity configured to receive a liquid coolant. In addition, a roller grate having such grate bars is provided.

1 . A grate covering for a roller grate of an incineration furnace having a furnace space, the roller grate having a carrying structure, the grate covering comprising: 
 a plurality of metallic grate bars disposed on the carrying structure so as to form an outer surface of the roller grate and being exposed directly to the furnace space, wherein each of the grate bars has a cavity configured to receive a liquid coolant.    
   
   
       2 . The grate covering as recited in  claim 1 , wherein each grate bar is cast and each cavity includes a coolant inlet, a coolant outlet and a cooling duct, and wherein the grate bars are fluidically connected in series so that the coolant outlet of a first grate bar is connected to the coolant inlet of an adjacent grate bar.  
   
   
       3 . The grate covering as recited in  claim 2 , wherein the cooling duct is one of straight, serpentine and spirally shaped.  
   
   
       4 . The grate covering as recited in  claim 1 , wherein in that the grate bars have a width so as to achieve a roller spacing system of  500  mm.  
   
   
       5 . The grate covering as recited in  claim 2 , further comprising a hose connection for fluidically connecting the coolant outlet of the first grate bar to the coolant inlet of the adjacent grate bar.  
   
   
       6 . The grate covering as recited in  claim 5 , wherein the hose connection includes two hose halves connected centrally via a screw connection.  
   
   
       7 . The grate covering as recited in  claim 6 , wherein the screw connection is completely encased by two adjacent grate bars in an assembled state.  
   
   
       8 . The grate covering as recited in  claim 5 , further comprising a protective plate completely covering the hose connection in an assembled state.  
   
   
       9 . The grate covering as recited in  claim 1 , wherein each grate bar includes ribs on an underside of the grate bar.  
   
   
       10 . The grate covering as recited in  claim 1 , wherein each grate bar includes a plurality of orifices for supply of primary air.  
   
   
       11 . The grate covering as recited in  claim 10 , wherein each orifice has a circular cross section.  
   
   
       12 . The grate covering as recited in  claim 1 , wherein the coolant is water.  
   
   
       13 . A roller grate comprising: 
 a roller drive;    a plurality of rollers each defining an axis and disposed axially parallel behind one another, each roller having a carrying structure and a grate covering having a plurality of metallic grate bars disposed on the carrying structure so as to form an outer surface of the roller grate, wherein each of the grate bars has a cavity configured to receive a liquid coolant;    a rotary lead-in device disposed on a first side of each roller facing away from the roller drive, the rotary lead-in device containing a supply line and a discharge line of the liquid coolant;    a first annular chamber disposed inside each roller and connected to the supply line;    a second annular chamber disposed inside each roller and connected to the discharge line;    a plurality of separate and parallel-connected sublines for the coolant being branched off from the first annular chamber and being combined again in the second annular chamber, wherein at least one of the sublines is assigned to two-series connected grate bar rows disposed opposite one another,    wherein an inflow and an outflow of the coolant is arranged on the first side of each roller, and wherein a flow direction of the coolant relative to the roller axis is reversed on a second side of the roller opposite the first side, the coolant flowing from an outlet of a first grate bar row to an inlet of an opposite grate bar row.