公开(公告)号：US20240280258A1

公开(公告)日：2024-08-22

申请号：US18569930

申请日：2022-06-29

Applicant: Valmet Technologies Oy

Inventor： Juha HILJANEN ,  Pekka LEHTONEN ,  Juha OJANPERÄ ,  Tuomas KANNIAINEN

IPC: F23C10/20 ,  F23C10/24

CPC classification number: F23C10/20 ,  F23C10/24

Abstract: A grate assembly for use in a bottom section (28) of a combustion chamber (12) of a fluidized bed boiler (10), comprising: a grate bottom wall (32); a protective refractory material layer (36); a plurality of nozzle devices (38) for supplying fluidizing primary air; at least one grate module (40) formed on the grate bottom wall (32). Each grate module (40) comprises a solids removal opening (42); a plurality of concentric landings (46) formed in the refractory material layer (36) and separated by frontal surfaces (48) between the landings. Each frontal surface (48) surrounds one of the landings and follows the shape of the perimeter of a rectangle or a rectangle with at least one shaped corner. The landings (46) define a stepped structure. Each landing comprises a group of the nozzle devices embedded in the refractory material layer (36) and adapted to jet the air through one of the frontal surfaces (48) along one of the landings (46) that is adjacent to the frontal surface.