Patent ID: 7073451

Claim:
A furnace wall structure having a furnace wall installed in a furnace which is the combustion chamber of a boiler for thermal power generation, said furnace wall comprising: a furnace wall bottom part composed of furnace wall tubes having upward-spiraled fluid passages; a nose part which has nose wall tubes disposed in a middle part of a furnace rear wall adjoining the furnace wall bottom part; and a screen part having screen tubes, wherein the terminal parts of said furnace wall tubes are located lower than the nose part, a header is provided at the connection part between the terminal parts of said furnace wall tubes and said nose wall tubes, and is installed lower than said nose part and outside the furnace wall, furnace wall tubes which extend upright from the terminal parts of said furnace wall tubes are provided so as to connect parts of the furnace wall tubes directly with the header, to connect the header with the nose wall tubes via vertical tubes; and to connect other parts of said furnace wall tubes directly with the screen tubes, thereby integrating the vertical furnace wall tubes, the vertical tubes, and the screen tubes by being welded via membrane bars.