Facility for longitudinal sealing up wind boxes in travelling grate facilities

A device for thermal treatment of bulk material, comprising a travelling grate chain being capable of revolving in the direction of movement consisting of an endless travelling grate (1) with movablelinks. Such a travelling grate chain features a plurality of pallet cars (3), each consisting of a frame (30) with end pieces (33), on which carrying wheels (31) are fixed, and grate rods (35) arranged on crossbars (32). Further, wind boxes (41, 43) are arranged such that from at least one wind box (41, 43) gas flows through the pallet cars (3) and their grate rods (35) from or into the wind boxes(41, 43). At each pallet car (3) of the travelling grate (1) at least one sealing blade (60) each is mounted in parallel to the moving direction and flush with the pallet car (3), whereby at least one sealing box (50) is foreseen in at least one section of the travelling grate (1) in parallel to the moving direction. A liquid medium can be filled into the at least one sealing box (50), wherein the sealing box (50) is arra