Patent ID: 7954460

Claim:
A boiler apparatus for leading fluid from a plurality of upper walls to a ceiling wall through a ceiling wall inlet header, comprising: a ceiling wall inlet mixing header is installed between the plurality of upper walls and the ceiling wall inlet header; wherein the plurality of upper walls includes side walls, a front wall, and a screen pipe, and does not include a nose wall projecting into a boiler furnace; wherein the ceiling wall inlet mixing header with opposite open ends being closed has a bent portion halfway thereof which forms the ceiling wall inlet mixing header in an L-shape and wherein the ceiling wall inlet mixing header is installed substantially in a central portion in a furnace width direction; a plurality of first holes formed near a first end portion of the ceiling wall inlet mixing header substantially on a same line along an axis of the ceiling wall inlet mixing header; a plurality of second holes formed near a second end portion of the ceiling wall inlet mixing header, wherein the second end portion is bent downward with respect to the first end portion; mixing header inlet connecting ducts connected to the side walls, the front wall, and the screen pipe, respectively, wherein the mixing header inlet connecting ducts are connected to the first holes formed near the first end portion of the ceiling wall inlet mixing header; and mixing header outlet connecting ducts extending to the ceiling wall inlet header, wherein the mixing header outlet connecting ducts are connected to the second holes formed near the second end portion of the ceiling wall inlet mixing header.