Boiler furnace wall replacement method and temporary maintenance structure of boiler furnace wall

摘要

Boiler furnace wall with the upper vertical tube wall and the lower spiral tube wall 3, a backstay arranged around the spiral tube wall 3 to support the furnace pressure, and fixed to the vertical tube wall and supporting the backstay In the boiler apparatus provided with the supporting member (8), a part of the furnace wall is fixed after the spiral tube wall (3) below a part of the furnace wall part (30) is temporarily fixed to the supporting member (8), and then temporarily held. A furnace for exchange to cut the outer edge of the portion 30 to extract a portion of the furnace wall portion 30 from the spiral tube wall 3 and close the opening 35 of the spiral tube wall 3 formed by the extraction. The wall portion 31 is joined to the periphery of the opening 35.