| 摘要 |
PROBLEM TO BE SOLVED: To provide a membrane bar structure which reduces occurrence and development of cracks at a welded part between a tube and a membrane bar, in a membrane panel structure of a boiler furnace wall which is constituted with a plurality of tubes and membrane bars. SOLUTION: The membrane panel of the boiler furnace wall is constituted with an airtight integrated tube bank wherein a plurality of waterwall tubes (6) are connected to membrane bars (9) each made of a narrow strip of steel and disposed along the longitudinal direction between the tubes through welded parts (8) that continue in the axial direction of the tubes. The thickness of the membrane bar at the central portion of its cross section is made larger than the thickness at both ends of the membrane bar, i.e., at the joints of the welded parts to the tubes, respectively, to constitute the membrane structure of the boiler furnace wall. In this way, occurrence and development of cracks at the welded parts between the tubes and the membrane bar are reduced.
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