Grate furnace

Abstract

A grate furnace with a grate ( 4 ) consisting of grate steps ( 15, 16, 17 ) composed [lacuna] grate elements lying next to one another, of which grate steps in each case every second grate step ( 15, 17 ) in the longitudinal direction of the grate can be driven for carrying out stoking movements and the grate steps ( 17 ) in each case lying therebetween can be fixed, has drive devices ( 18 ) under the grate, which are in each case arranged in housing chambers ( 25 ) and are in this way protected against impairment caused by material falling through the grate.

1 . A grate furnace with a grate consisting of grate steps composed [lacuna] grate elements lying next to one another, of which grate steps in each case every second grate step in the longitudinal, direction of the grate can be driven for carrying out stoking movements and the grate steps in each case lying therebetween are stationary, the drive devices for the movable grate steps being arranged under the grate, wherein the drive devices ( 18 ) are arranged under the grate ( 4 ), protected by housings ( 25 ).  
     
     
         2 . The grate furnace as claimed in  claim 1 , wherein a separate housing chamber ( 25 ) is provided for each drive device ( 18 ).  
     
     
         3 . The grate furnace as claimed in  claim 1  or  2 , wherein each housing chamber ( 25 ) is thermally insulated.  
     
     
         4 . The grate furnace as claimed in one of  claims 1  to  3 , wherein forced ventilation is provided for each housing chamber ( 25 ).  
     
     
         5 . The grate furnace as claimed in one of  claims 1  to  4 , wherein the housing ( 25 ) is of streamlined design in the flow direction of the primary air supplied for the grate furnace in at least one underblast chamber ( 7 ).  
     
     
         6 . The grate furnace as claimed in one of  claims 1  to  5 , wherein successive housing chambers ( 25 ) are staggered in relation to one another in a stepped manner following the grate inclination.  
     
     
         7 . The grate furnace as claimed in one of  claims 1  to  6 , wherein a drive device ( 18 ) is in each case assigned to two movable grate steps ( 15 ,  16 ).  
     
     
         8 . The grate furnace as claimed in one of  claims 1  to  7 , wherein each drive device ( 18 ) comprises at least one hydraulic cylinder/piston unit ( 19 ,  20 ), the piston rod ( 20 ) of which is connected to a push rod ( 24 ) which is guided in a sealed manner through the housing wall and engages on a carriage ( 9 ), to which at least one grate step ( 15 ,  16 ) to be moved is connected.  
     
     
         9 . The grate furnace as claimed in  claim 8 , wherein the piston rod ( 20 ) is connected to the push rod ( 24 ) by an articulation ( 23 ).  
     
     
         10 . The grate furnace as claimed in  claim 8  or  9 , wherein the carriages ( 9 ) are guided on guide tracks ( 12 ) which run parallel to the movement paths of the movable grate steps ( 15 ,  16 ) and are in each case arranged above a housing chamber ( 25 ) of an adjacent drive device ( 18 ).